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Effect of adding extra ferrite above the base ferrite at different physical locations on the self-inductance, mutual inductance and coupling factor is under investigation in this paper. The addition can increase or decrease the mutual inductance depending Ruud, Clayton O. This document summarizes the results of research conducted at Pacific Northwest National Laboratory PNNL to determine whether, based on experimental measurements, a correlation existed between grain structure in cast austenitic stainless steel CASS piping and ferrite content of the casting alloy.

The motivation for this research lies in the fact that ultrasonic testing UT is strongly influenced by CASS grain structure; knowledge of this grain structure may help improve the ability to interpret UT responses, thereby improving the overall reliability of UT inspections of CASS components.

Advances in ferrite microwave materials and devices. The application of ferrites in non-reciprocal components is discussed, with the emphasis on broadband isolators and circulators. For the best currently available devices this ratio is approx.

Plasticity of oxide dispersion strengthened ferritic alloys. Their tensile properties have been tested from 20 to C. These alloys are high tensile and creep resistant between and C. Their strongly stress-sensitive creep behaviour can be described by usual creep laws and incorporating a threshold stress below which the creep rate is negligible. Beam impedance of ferrite kicker magnets. We have measured the longitudinal beam impedance of a typical pulsed magnet that will be used in the Advanced Light Source.

The magnets are of a ferrite window-frame design with a single plate conductor on each side. Two separate power supplies are used to drive current in opposite directions in the two conductors. The continuity of the ferrite yoke is interrupted by two copper plates 1 mm thick in the center of the top and bottom of the window frame.

This increases the reluctance of the magnetic path, and thus decreases the flux which couples the beam. This makes a ohm transmission line, and it was terminated in a resistive divider at the exit end. A 3 GHz network analyzer was used to measure S 21 through the magnet, and longitudinal beam impedance was calculated from this data. The impedance is dominated by two low frequency resonances in the magnet winding and drive current.

Dissolution studies on Nickel ferrite in dilute chemical decontamination formulations. Ranganathan, S. Department of Chemistry. Nickel ferrite is one of the important corrosion products in the pipeline surfaces of water-cooled nuclear reactors. The dissolution of the nickel ferrite by chelating agents is very sensitive to the nature of the chelant, the nature of the reductant used in the formulation and the temperature at which the dissolution studies are performed. The dissolution is mainly controlled by the reductive dissolution of the ferrite particles, but complexing agents also play a significant role in the dissolution process.

This study deals with the leaching of iron and nickel from nickel ferrite prepared by the solid-state method. The addition of Fe II -L in the formulation greatly enhances the dissolution of nickel ferrite. The preferential leaching of nickel over iron during the dissolution of nickel ferrite was observed in all the formulations.

Manufacturing of Mn-Zn ferrite transformer cores. The present work is related to the development of soft ferrite transformer cores, which are extensively used in electronic devices such as switch mode power supplies, electromagnetic devices, computers, amplifiers etc. Mn-Zn Ferrite soft ferrite powders were prepared by conventional mixed oxide and auto combustion routes. These powders were calcined and then pressed in toroid shapes. Sintering was done at different temperatures to develop desired magnetic phase.

Impedance resistance of sintered toroid cores was measured at different frequencies. Results revealed that Mn-Zn Ferrite cores synthesized by auto combustion route worked more efficiently in a high frequency range i. It was noticed that compact size, light weight and high impedance resistance are the prime advantages of auto combustion process which supported the performance of core in MHz frequency range.

Furthermore, these compact size cores were successfully tested in linear pulse amplifier circuit of Pakistan Atomic Research Reactor-I. The fabrication of soft ferrite Mn-Zn Ferrite cores by different processing routes is an encouraging step towards indigenization of ferrite technology. Ferrite materials have long played an important role in power conditioning, conversion, and generation across a wide spectrum of frequencies up to ten decades.

They remain the preferred magnetic materials, having suitably low losses, for most applications above 1 MHz, and are the only viable materials for nonreciprocal magnetic microwave and millimeter-wave devices including tunable filters, isolators, phase shifters, and circulators. Recently, novel processing techniques have led to a resurgence of research interest in the design and processing of ferrite materials as nanoparticles, films, single crystals, and metamaterials. These latest developments have set the stage for their use in emerging technologies that include cancer remediation therapies such as magnetohyperthermia, magnetic targeted drug delivery, and magneto-rheological fluids, as well as enhanced magnetic resonance imaging.

With reduced dimensionality of nanoparticles and films, and the inherent nonequilibrium nature of many processing schemes, changes in local chemistry and structure have profound effects on the functional properties and performance of ferrites.

In this lecture, we will explore these effects upon the fundamental magnetic and electronic properties of ferrites. Density functional theory will be applied to predict the properties of these ferrites , with synchrotron radiation techniques used to elucidate the chemical and structural short-range order. This approach will be extended to study the atomic design of ferrites by alternating target laser-ablation deposition.

Recently, this approach has been shown to produce ferrites that offer attractive properties not found in conventionally grown ferrites. We will explore the latest research developments involving ferrites as related to microwave and millimeter-wave applications and the attempt to integrate these materials with semiconductor materials platforms.

RF electromagnetic wave absorbing properties of ferrite polymer composite materials. The complex permeability of the composites was found to increase as the ferrite content increased, and was characterized by frequency dispersion localized above 50MHz. The variation of return loss RL of single-layer RF absorbers using the prepared composite materials has been investigated as a function of frequency, ferrite content and the thickness of the absorbers. Fast ferrite tuner for the BNL synchrotron light source.

A new type of ferrite tuner has been tested at the BNL. The ferrite tuner uses garnet slabs partially filling a stripline. One of the important features of the tuner is that the ferrite is perpendicularly biased for operation above FMR, thus reducing the magnetic losses.

A unique design was adopted to achieve the efficient cooling. The principle of operation of the tuner as well as our preliminary results on tuning a 52 MHz cavity are reported. Optimized conditions under which we demonstrated linear tunability of 80 KHz are described. The tuner's losses and its effect on higher-order modes in the cavity are discussed. The mechanism of nickel ferrite formation by glow discharge effect. The influence of various factors on the formation of nickel ferrite by the glow discharge effect has been studied.

The ferritization process in the system FeSO4-NiSO4-NaOH-H2O has been studied by the methods of potentiometric titration, measurement of electrical conductivity, residual concentrations and apparent sediment volume. It has been established that the process proceeds in a multistage fashion at pH with the formation of polyhydroxo complexes, an intermediate compound and the ferrite formation by its oxidation with active radicals. Moessbauer spectroscopic characterization of ferrite ceramics.

The principle of Moessbauer effect and the nature of hyperfine interactions were presented. The discovery of the Moessbauer effect was the basis of a new spectroscopic technique, called Moessbauer spectroscopy, which has already made important contribution to research in physics, chemistry, metallurgy, mineralogy and biochemistry.

In the present work the selected ferrites such as spinel ferrite , NiFe 2 O 4 , and some rare earth orthoferrites and garnets were investigated using Moessbauer spectroscopy. X-ray powder diffraction and Fourier transform infrared spectroscopy were used as complementary techniques. C and after heating at deg. C the stoichiometric NiFe 2 O 4 was produced.

The effect of ball-milling of NiFe 2 O 4 was monitored. Similar behavior was observed during the formation of Er 3 Fe 5 O Creep lifetime assessements of ferritic pipeline welds. The low alloy ferritic steam pipework in Advanced Gas Cooled reactor AGR power stations operates at temperatures in the creep range.

An inspection strategy for continued operation of the pipework has been developed based on estimation of the creep rupture life of pipework weldments and fracture mechanics for demonstrating acceptance of defects. This strategy is described in outline. The estimation of creep rupture life is described in more detail. Validation for the approach is illustrated by comparison with pressure vessel tests and with metallographic examination of components removed from service.

The fracture mechanics methods are also described. It is shown that the amount of creep crack growth is dependent on the life fraction at which the assessment is made; crack growth being rapid as the creep rupture life is approached.

New ferritic steels for advanced steam plants. These new steels are already being applied in 13 European and 34 Japanese power stations with inlet steam temperature up to deg C. This presentation will give an account of the content, scope and results of the research programmes and of the experience gained during the production of components which have been manufactured from the new steels. Positron annihilation characterization of nanostructured ferritic alloys.

Some annihilations may also occur in small cavities. In Y-free control alloys, that do not contain NFs, positrons primarily annihilate in the Fe-Cr matrix and at features such as dislocations, while a small fraction annihilate in large cavities or Ar bubbles. Tuning the magnetism of ferrite nanoparticles. The importance of magnetic interactions within an individual nanoparticle or between adjacent ones is crucial not only for the macroscopic collective magnetic behavior but for the AC magnetic heating efficiency as well.

The role of cobalt ferrite magnetic nanoparticles in medical science. The nanotechnology industry is rapidly growing and promises that the substantial changes that will have significant economic and scientific impacts be applicable to a wide range of areas, such as aerospace engineering, nano-electronics, environmental remediation and medical healthcare. In this area, cobalt ferrite nanoparticles have been regarded as one of the competitive candidates because of their suitable physical, chemical and magnetic properties like the high anisotropy constant, high coercivity and high Curie temperature, moderate saturation magnetization and ease of synthesis.

This paper introduces the magnetic properties, synthesis methods and some medical applications, including the hyperthermia, magnetic resonance imaging MRI , magnetic separation and drug delivery of cobalt ferrite nanoparticles. Behavior of ferritic steels irradiated by fast neutrons. Ferritic steels were irradiated in Rapsodie and Phenix at varying doses. The swelling and irradiation creep characteristics are reported below as are the mechanical characteristics of these materials [fr.

The behaviour of ferritic steels under fast neutron irradiation. Ferritic steels have been irradiated in Rapsodie and Phenix to doses up to dpa F. The swelling and irradiation creep characteristics and the mechanical properties of these materials are reported. Antiresonance in Ni,Zn ferrite -carbon nanofibres nanocomposites.

Fernandez-Garcia, L. Low-activation ferritic steels are leading material candidates for use in next-generation fusion development experiments such as a prospective US component test facility and DEMO. Understanding the interaction of plasmas with a ferromagnetic wall will provide crucial physics for these experiments. Using its high-resolution magnetic diagnostics and positionable walls, HBT-EP has begun exploring the dynamics and stability of plasma interacting with high-permeability ferritic materials tiled to reduce eddy currents.

We summarize a simple model for plasma-wall interaction in the presence of ferromagnetic material, describe the design of a recently-installed set of ferritic shell segments, and report initial results. Supported by U. Ferrite bead effect on Class-D amplifier audio quality. International audience; This paper studies the effect of ferrite beads on the audio quality of Class-D audio amplifiers.

This latter is a switch-ing circuit which creates high frequency harmonics. Generally, a filter is used at the amplifier output for the sake of electro-magnetic compatibility EMC. So often, in integrated solutions, this filter contains ferrite beads which are magnetic components and present nonlinear behavior. Time domain measurements and their equivalence in frequency do The future thermal power plant is expected to operate at higher temperature to improve its efficiency and to reduce greenhouse gas emission.

This target requires better corrosion properties of ferritic steels, which commonly used as materials for superheater and reheater of boiler tubes. In this work, chromium enrichment on the surface of ferritic steel is studied. The deposited chromium is expected to become a reservoir for the formation of chromia protective layer. Chromium was deposited on Initial commissioning of the injector revealed a rise time excited 7.

Commissioning also revealed that the use of the crowbar to decrease the voltage fall time excited a spectrum of radio frequency modes which caused concern that there might be significant transient RF electric field stresses imposed on the high voltage column insulators. Based on the experience of damping the induction cell RF modes with ferrite , the concept of a ferrite damper was developed to address the crowbar-excited oscillations as well as the rise-time-excited 7.

After the Project decided to discontinue the use of the crowbar, further development of the concept focused exclusively on damping the oscillations excited by the rise time. The organization of this report is as follows. The suite of injector diagnostics are described in Section 2. The data and modeling of the injector transients excited on the rise-time and also by the crowbar are discussed in Section 3; the objective is a concise summary of the present state of understanding.

The design of the ferrite damper, and the small scale circuit simulations used to evaluate the ferrite material options and select the key design parameters like the cross sectional area and the optimum gap width, are presented in Section 4. The details of the mechanical design and the installation of the ferrite damper are covered in Section 5. A brief summary of the performance of the ferrite damper following its installation in the injector is presented in Section 6.

Spin canting phenomenon in cadmium doped cobalt ferrites Aug 26, It has been recognized for some time that the very high fluence of fast The best-understood and most promising solutions presently available are a family of low-activation steels originally developed for use in fission reactors, but the ferromagnetic properties of these steels represent a danger to plasma confinement through enhancement of magnetohydrodynamic instabilities and increased susceptibility to error fields. At present, experimental research into the effects of ferromagnetic materials on MHD stability in toroidal geometry has been confined to demonstrating that it is still possible to operate an advanced tokamak in the presence of ferromagnetic components.

In order to better quantify the effects of ferromagnetic materials on tokamak plasma stability, a new ferritic wall has been installated in the High Beta TokamakExtended Pulse HBT-EP device. The development, assembly, installation, and testing of this wall as a modular upgrade is described, and the effect of the wall on machine performance is characterized. Comparative studies of plasma dynamics with the ferritic wall close-fitting against similar plasmas with the ferritic wall retracted demonstrate substantial effects on plasma stability.

Susceptibility of plasmas to disruption events increases by a factor of 2 or more with the ferritic wall inserted, as disruptions are observed earlier with greater frequency. Growth rates of external kink instabilities are observed to be twice as large in the presence of a close-fitting ferritic wall. Initial studies are made of the influence of mode rotation frequency.

Intragranular ferrite morphologies in medium carbon vanadium-microalloyed steel. Full Text Available The aim of this work was to determine TTT diagram of medium carbon V-N micro-alloyed steel with emphasis on the development of intragranular ferrite morphologies.

These treatments were interrupted at different times in order to analyze the evolution of the microstructure. Metallographic evaluation was done using optical and scanning electron microscopy SEM. In addition to sheaf type acicular ferrite , the grain boundary nucleated bainitic sheaves are observed. Structural investigation of chemically synthesized ferrite magnetic nanomaterials.

Uyanga, E. In recent times, interest in ferrite magnetic nanomaterials has considerably grown, mainly due to their highly promising medical and biological applications. Spinel ferrite powder samples, with high heat generation abilities in AC magnetic fields, were studied for their application to the hyperthermia treatment of cancer tumors. These properties of ferrites strongly depend on their chemical composition, ion distribution between crystallographic positions, magnetic structure and method of preparation.

In this study, crystal and magnetic structures of several magnetic spinels were investigated by neutron diffraction. The explanation of the mechanism triggering the heat generation ability in the magnetic materials, and the electronic and magnetic states of ferrite -spinel type structures, were theoretically defined by a first-principles method.

Ferrites with the composition of CuxMg1-xFe2O4 have been investigated as a heat generating magnetic nanomaterial. Kharat, Prashant B. The XRD results confirmed the formation of single phase spinel structure. The Raman spectra have been deconvoluted into individual Lorentzian peaks. Cobalt ferrite has cubic spinel structure with Fd3m space group. These absorption bands confirm the formation of spinel-structured cobalt ferrite.

Brookfield DV-III viscometer and programmable temperature-controlled bath was used to study the relationship between viscosity and temperature. The viscosity of the present ferrofluid was found to decrease with increase in temperature. Specific heat of nano- ferrites modified composites. Initially, nano- ferrites were introduced in epoxy systems in order to improve the electromagnetic properties of formed materials. Together with the changes in electromagnetic properties some modifications occur regarding thermal and mechanical properties.

The materials were formed by placing 5g or 10g of ferrite into g polymer matrix leading to a very low weight ratio of modifying agent. At so low ratios the effect of ferrite presence should be insignificant according to mixing rule. Anyway there is possible to appear some chelation reaction with effects on thermal properties of materials. Three types of epoxy resins had been used as matrix and barium ferrite and strontium ferrite as modifying agents.

The thermal analysis was developed on two heatingcooling cycles and the specific heat was evaluated for each segment of the cycle analysis. E-mail: leeyk yumc. Experimental ME coefficients and voltages were compared to analytical calculations using a quasi-static model. Theoretical demagnetizing factors of two magnetic discs that interact together in parallel magnetic structures were derived from an analytical calculation based on a superposition method.

These factors were introduced in ME voltage calculations which take account of the demagnetizing effect. To fit the experimental results, a mechanical coupling factor was also introduced in the theoretical formula. This reflects the differential strain that exists in the ferrite and PZT layers due to shear effects near the edge of the ME samples and within the bonding epoxy layers.

From this study, an optimization in magnitude of the ME voltage is obtained. The advantage of such a structure is then discussed. Full Text Available Plasma spot welding of ferritic stainless steels is studied.

The study was focused on welding parameters, plasma and shielding gases and the optimum welding equipment. Several macro specimens were prepared. Plasma spot welding is suitable to use the same gas as shielding gas and as plasma gas, i.

Tension-shear strength of plasma-spot welded joints was compared to that of resistance-spot welded joints. It was found that the resistance welded joints withstand a somewhat stronger load than the plasma welded joints due to a larger weld spot diameter of the former. Se realizaron macro pulidos. Water corrosion resistance of ODS ferritic -martensitic steel tubes.

Oxide dispersion strengthened ODS ferritic -martensitic steels have superior radiation resistance; it is possible to achieve a service temperature of up to around K because of their superior creep strength. These advantages of ODS steels facilities their application to long-life cladding tubes in advanced fast reactor fuel elements. In addition to neutron radiation resistance, sufficient general corrosion resistance to maintain the strength of the cladding, and the stress corrosion cracking SCC resistance for spent-fuel-pool cooling systems and high-temperature oxidation for the fuel-clad chemical interaction FCCI of ODS ferritic steel are required.

In a previous paper, it has been demonstrated that the resistances of 9Cr- and 12Cr-ODS ferritic -martensitic steels for high-temperature oxidation are superior to those of conventional 12Cr ferritic steel. However, the water corrosion data of ODS ferritic -martensitic steels are very limited. In this study, a water corrosion test was conducted on ODS steels in consideration of the spent-fuel-pool cooling condition, and the results were compared with those of conventional austenitic stainless steel and ferritic -martensitic stainless steel.

A theoretical model to predict the phase shift in the partially magnetized state has been derived. Contrary to the bulky external magnets employed by conventional ferrite. Bismuth ferrite as low-loss switchable material for plasmonic waveguide modulator. We propose new designs of plasmonic modulators, which can beused for dynamic signal switching in photonic integrated circuits.

We studyperformance of a plasmonic waveguide modulator with bismuth ferrite as atunable material. The bismuth ferrite core is sandwiched between metalplates metal The sensitization behaviors of L-grade SSs having predominant austenitic structure with small amount of ferrite have not been well understood.

In this regard, the effect of ferrite morphology on sensitization was investigated in this study. The sensitization behaviors of three heats of L and LN SSs were investigated, Stringer type of ferrite L - heat A and B showed the early sensitization by chromium depletion at ferrite. And, later sensitization is due to GB sensitization.

It could be due to sufficient supply of chromium from relatively large ferrite phase. As a consequence, the sensitization of L SSs could be affected by their ferrite morphology rather than ferrite content. It can be used as an effective method for evaluation of type of sensitization. A biosensor system using nickel ferrite nanoparticles.

Singh, Prachi, E-mail: prachi. Nanoscale magnetic materials are an important source of labels for biosensing due to their strong magnetic properties which are not found in biological systems. The performance of the sensor was determined based on its sensitivity, response time and recovery time.

Magnetostatic excitations in thin ferrite films. The authors discuss the influence of the exchange interaction and dissipative processes in thin ferrite films on the eigenfrequency spectrum of magnetostatic standing waves and on the dispersion relation and attenuation of magnetostatic traveling waves. The traveling waves have auxiliary branches of the dispersion relation with weak damping near the spin-wave-resonance SWR frequencies. Dissipation has only a relatively weak effect on the frequency spectrum of the standing waves, shifting it upward.

For the traveling waves, however, dissipation leads to qualitative changes in the structure of the dispersion relation, giving rise to new branches, forbidden bands, reentrant and anomalous-dispersion regions. Neutron depolarization in compressed ferrite powders. The polarization change of a polarized neutron beam after transmission through a partly magnetized ferromagnetic material can be described by a 3x3 depolarization matrix.

In the underlying depolarization theory it is assumed that no correlations exist between the direction of the spontaneous magnetization Bs in neighbouring domains, and between the direction of Bs and the individual domain sizes. In order to extend the measuring method for ferromagnetic materials, measurements have been made with different compressed ferrite powders assuming that the mean domain size is equal to the mean particle size. The possibilities and limitations of the measuring method are discussed.

Microwave left-handed composite material made of slim ferrite rods and metallic wires. This paper reports on experimental study of the microwave properties of a composite material consisting of ferrite and copper wires. It finds that the slim ferrite rods can modify the magnetic field distribution through their anisotropy, so that the ferrite 's negative influence on the copper wires' plasma will be reduced. Left-handed properties are observed even in the specimen with close stuck ferrite rods and copper wires.

Plasma discharge in ferritic first wall vacuum vessel of the Hitachi Tokamak HT A tokamak discharge with ferritic material first wall was tried successfully. The Hitachi Tokamak HT-2 had a stainless steel SUS vacuum vessel and modified to have a ferritic plate first wall for experiments to investigate the possibility of ferritic material usage in magnetic fusion devices. The achieved vacuum pressure and times used for discharge cleaning was roughly identical with the stainless steel first wall or the original HT We concluded that ferritic material vacuum vessel is possible for tokamaks.

Heating temperature effect on ferritic grain size of rotor steel. Heating up to deg C and above leads to substantial ferritic grain growth. The kinetics of ferritic grain growth is determined by the behaviour of phases controlling the austenitic grain growth, such as carbonitrides VCsub 0.

Reduction of carbon and alloying elements content in steel composition observed at the liquation over rotor length leads to a certain decrease of ferritic grain resistance to super heating. Magnesium ferrite nanoparticles: a rapid gas sensor for alcohol. Highly porous spinel MgFe2O4 nanoparticles with a high specific surface area have been successfully synthesized by a sintering free auto-combustion technique and characterized for their structural and surface morphological properties using XRD, BET, TEM and SEM techniques.

Their sensing properties to alcohol vapors viz. The site occupation of metal ions was investigated by VSM. The as-synthesized sample shows the formation of sponge-like porous material which is necessary for gas adsorption. The gas sensing characteristics were obtained by measuring the gas response as a function of operating temperature, concentration of the gas, and the response-recovery time. The response of magnesium ferrite to ethanol and methanol vapors was compared and it was revealed that magnesium ferrite is more sensitive and selective to ethanol vapor.

Thus the present study explored the possibility of making rapidly responding alcohol vapor sensor based on magnesium ferrite. The sensing mechanism has been discussed in co-relation with magnetic and morphological properties. Effect of rare earth substitution in cobalt ferrite bulk materials. The saturation magnetization and coercive field values of the doped samples obtained by Vibrating Sample Magnetometry were close to those of the pure cobalt ferrite.

For magnetostrictive property studies the samples were analyzed using the strain gauge method. Higher maximum magnetostriction coefficients were found for the Ho, Ce, Sm and Yb doped cobalt ferrite bulk materials as related to the stoichiometric CoFe 2 O 4 sample. Moreover, improved strain derivative was observed for these samples but at higher magnetic fields due to the low increase of the coercive field values for doped samples.

There have been numerous efforts to develop creep-resistant materials strengthened by incoherent particles at high temperatures and stresses in response to future energy needs for steam turbines in thermal-power plants.

This alloy is strengthened by nano-scaled LNi2TiAl Heusler phase -based precipitates, which themselves contain coherent nano-scaled B2 zones. These coherent hierarchical precipitates are uniformly distributed within the Fe matrix. These results provide a new alloy-design strategy using the novel concept of hierarchical precipitates and the fundamental science for developing creep-resistant ferritic alloys.

The present research will broaden the applications of ferritic alloys to higher temperatures. It updates the Radiation induced phosphorus segregation in austenitic and ferritic alloys. The radiation induced surface segregation RIS of phosphorus in stainless steel attained a maximum at a dose of 0. This decrease in the surface segregation of phosphorus at high dose levels has been attributed to removal of the phosphorus layer by ion sputtering. Phosphorus is not replenished since essentially all of the phosphorus within the irradiation zone has been segregated to the surface.

This sputtering phenomenon places an inherent limitation to the heavy ion irradiation technique for the study of surface segregation of impurity elements. The magnitude of the segregation in ferritics is still much less than in stainless steel which can be related to the low damage accumulation in these alloys. Tube manufacturing and characterization of oxide dispersion strengthened ferritic steels.

Oxide dispersion strengthened ODS ferritic steels have an advantage in radiation resistance and superior creep rupture strength at elevated temperature due to finely distributed Y 2 O 3 particles in the ferritic matrix. Using a basic composition of low activation ferritic steel FeCr-2W The recrystallization heat-treatment, to soften the tubes hardened due to cold-rolling and to subsequently improve the degraded mechanical properties, was demonstrated to be effective in the course of tube manufacturing.

For a titanium content of 0. The ductility is also adequately maintained. Conventional Cr Cr-Mo steels were the first candidates for these applications. For fusion reactors, reduced-activation steels were developed that were patterned on the conventional steels but with molybdenum replaced by tungsten and niobium replaced by tantalum. Both the conventional and reduced-activation steels are considered to have an upper operating temperature limit of about degC.

For improved reactor efficiency, higher operating temperatures are required. Cellulose acetate CA nanoparticles were combined with two antimicrobial agents, namely lemongrass LG essential oil and Cu- ferrite nanoparticles. Several physical and chemical analyses were performed to characterize the resulting NCs and to study their formation mechanism.

The size of the combined antimicrobial NCs was found to be ca. The magnetic properties of the combined construct were weak, due to the shielding of Cu- ferrites from the polymeric matrix, making them available for drug delivery applications where spontaneous magnetization effects should be avoided. Impedimetric detection of alcohol vapours using nanostructured zinc ferrite. A comparative study on the sensing characteristics of nanostructured zinc ferrite to three primary alcohols viz.

Impedance studies in the alcohol concentration range varying from to ppm show definite variations in response to both the nature of the alcohol and its concentration. The nanostructured zinc ferrite shows the highest sensor response to methanol and least to propanol.

Equivalent circuit modelling and calibration have been made for all the three alcohol sensors. The material shows a better selectivity to the alcohols compared to formaldehyde, ammonia and acetone vapours. All rights reserved. Multifunctional metal ferrite nanoparticles for MR imaging applications.

Magnetic Resonance Imaging MRI is a very powerful non-invasive tool for in vivo imaging and clinical diagnosis. With rapid advancement in nanoscience and nanotechnology, there is rapid growth in nanoparticles-based contrast agents. Progress in synthetic protocols enable synthesis of multifunctional nanoparticles which facilitated efforts toward the development of multimodal contrast agents.

In this review, recent developments in metal ferrite -based MR contrast agents have been described. Specifically, effect of size, shape, composition, assembly and surface modification of metal ferrite nanoparticles on their T 2 contrast have been discussed. The review further outlines the effect of leaching on MRI contrast and other various factors which affect the multimodal ability of the T 1 —T 2 and T 2 -thermal activation metal ferrite nanoparticles. The nature of temper brittleness of high-chromium ferrite.

Sarrak, V. It is shown that the general rise in the curve of temperature-dependent local flow stress has the decisive influence on the position of the ductile-to-brittle transformation temperature and the increase in it as the result of a hold at temperatures of development of brittleness.

The established effect is related to the change in the parameters determining dislocation mobility, that is, the activation energy of dislocation movement in high-chromium ferrite and the resistance to microplastic deformation, both caused by processes of separation into layers of high-chromium ferrite and decomposition of the interstitial solid solution. Tri-metallic ferrite oxygen carriers for chemical looping combustion.

The disclosure provides a tri-metallic ferrite oxygen carrier for the chemical looping combustion of carbonaceous fuels. The tri-metallic ferrite oxygen carrier comprises Cu. Generally, 0. The tri-metallic ferrite oxygen carrier may be used in various applications for the combustion of carbonaceous fuels, including as an oxygen carrier for chemical looping combustion. Kinetics of niobium carbide precipitation in ferrite. The aim of this study is to develop a NbC precipitation modelling in ferrite.

This theoretical study is motivated by the fact it considers a ternary system and focus on the concurrence of two different diffusion mechanisms. The mean radius of the precipitates is characterized by TEM observations. To focus on the nucleation stage, we use the Tomographic Atom Probe that analyses, at an atomistic scale, the position of the solute atoms in the matrix.

A first model based on the classical nucleation theory and the diffusion-limited growth describes the precipitation of spherical precipitates. To solve the set of equations, we use a numerical algorithm that furnishes an evaluation of the precipitated fraction, the mean radius and the whole size distribution of the particles. The parameters that are the interface energy, the solubility product and the diffusion coefficients are fitted with the data available in the literature and our experimental results.

It allows a satisfactory agreement as regards to the simplicity of the model. Monte Carlo simulations are used to describe the evolution of a ternary alloy Fe-Nb-C on a cubic centred rigid lattice with vacancy and interstitial mechanisms. This is realized with an atomistic description of the atoms jumps and their related frequencies. The model parameters are fitted with phase diagrams and diffusion coefficients.

For the sake of simplicity, we consider that the precipitation of NbC is totally coherent and we neglect any elastic strain effect. We can observe different kinetic paths: for low supersaturations, we find an expected precipitation of NbC but for higher supersaturations, the very fast diffusivity of carbon atoms conducts to the nucleation of iron carbide particles.

We establish that the occurrence of this second phenomenon depends on the vacancy arrival kinetics and can be related. Superparamagnetic response of zinc ferrite incrusted nanoparticles. Lopez-Maldonado, K. Complutense de Madrid, Madrid Spain ; and others.

The blocking temperature at K in the ZFC—FC curves indicates the presence of a superparamagnetic response which is attributable to the incrusted nanocrystallites. Moreover, the hysteresis loops show the coexistence of superpara- and paramagnetic responses. The former is observable at the low field region; meanwhile, the second one is responsible of the lack of saturation at high field region.

This last behavior is related to a paramagnetic contribution coming from well-ordered crystalline microdomains. The hysteresis loops are analyzed by means of two different models. The first one is the susceptibility model used to examine separately the para- and superparamagnetic contributions. The fittings with the theoretical model confirm the presence of the above mentioned magnetic contributions. Oxidation rate in ferritic superheater materials. On the steam side of superheater tubes, compact oxide layers are formed which have a tendency to crack and flake off exfoliate.

Oxide particles then travel with the steam and can give rise to erosion damage in valves and on turbine blades. In an evaluation of conditions in superheater tubes from Swedish power boilers, it was found that the exfoliation frequency for one material quality SS was greater than for other qualities.

Against this background, a literature study has been carried out in order to determine which mechanisms govern the build-up of oxide and the exfoliation phenomenon. The reason why the exfoliation frequency is greater for tubes of SS is probably that the tubes have been exposed to higher temperatures. SS 2. The principal cause of the exfoliation is said to be stresses which arise in the oxide during the cooling-down process associated with shutdowns. The stresses give rise to longitudinal cracks in the oxide, and are formed as a result of differences in thermal expansion between the oxide and the tube material.

In addition, accounts are presented of oxidation constants and growth velocities, and thickness and running time. These data constitute a valuable basis for practical estimates of the operating temperature in routine checks and investigations into damage in superheater tubes. Permanent magnetic ferrite based power-tunable metamaterials. Power-tunable metamaterials based on barium permanent magnetic ferrite have been proposed and fabricated in this research.

Scattering parameter measurements confirm a shift in resonant frequency in correlation to changes in incident electromagnetic power within microwave frequency band. The tunable phenomenon represented by a blue-shift in transmission spectra in the metamaterials array can be attributed to a decrease in saturation magnetization resulting from FMR-induced temperature elevation upon resonant conditions.

This power-dependent behavior offers a simple and practical route towards dynamically fine-tunable ferrite metamaterials. Modeling ferrite electromagnetic response in the time domain. The behavior of ferrite loads commonly found in induction accelertors has important consequences for the performance of these accelerators.

Previous work by the authors on modeling the electromagnetic fields in induction cavities has focussed upon use of a simple, phenomenological model for the process of magnetization reversal in these ferrite loads. In this paper we consider a model for magnetization reversal which is more deeply rooted in theory, and present a simulation of the reversal process based upon this model for an idealized set of boundary conditions.

Enhanced durability and reactivity for zinc ferrite desulfurization sorbent. Zinc ferrite sorbents are intended for use in desulfurization of hot coal gas in integrated gasification combined cycle IGCC or molten carbonate fuel cell MCFC applications. For the present program, the reactivity of the sorbent may be defined as its sulfur sorption capacity at the breakthrough point and at saturation in a bench-scale, fixed-bed reactor. Durability may be defined as the ability of the sorbent to maintain important physical characteristics such As size, strength, and specific surface area during 10 cycles of sulfidation and oxidation.

Microstructural examination of commercial ferritic alloys at DPA. These results further demonstrate the high swelling resistance and microstructural stability of the ferritic alloy class. Full Text Available Cobalt ferrite , CoFe2O4, nanocrystalline films were deposited using electrostatic spray method and explored in sustainable hydrogen production application.

Reflection planes in X-ray diffraction pattern confirm CoFe2O4 phase. The surface scanning microscopy photoimages reveal an agglomeration of closely-packed CoFe2O4 nanoflakes. Concentrated solar-panel, a two-step water splitting process, measurement technique was preferred for measuring the hydrogen generation rate.

Evaluation of cost reduction method for manufacturing ODS ferritic claddings. Based on the results of their technology development, mass production process with highly economically benefit as well as manufacturing cost estimation of ODS ferritic claddings were preliminarily conducted.

From the view point of future utility scale, the cost for manufacturing mother tubes has a dominant factor in the total manufacturing cost. The method to reduce the cost of mother tube manufacturing was also preliminarily investigated. The filler powders laser welding of ODS ferritic steels. Laser welding was performed on Oxide Dispersion Strengthened ODS ferritic steel with the self-designed filler powders.

The generated particles were evenly distributed in the weld metal and their forming mechanism and behavior were analyzed. The results of the tests showed that the nano-particles, submicron particles and dislocation rings were able to improve the micro-hardness and tensile strength of welded joint, and the filler powders laser welding was an effective welding method of ODS ferritic steel.

Fabrication of oxide dispersion strengthened ferritic clad fuel pins. A resistance butt welding procedure was developed and qualified for joining ferritic fuel pin cladding to end caps. With adequate parameter control the weld is formed without a residual melt phase and its strength approaches that of the cladding.

This welding process required a new design for fuel pin end cap and weld joint. Summaries of the development, characterization, and fabrication processes are given for these fuel pins. Evaluation of welds on a ferritic -austenitic stainless steel. Five different welding methods for the ferritic -austenitic steel 22Cr6Ni3MoN have been evaluated on mill welded heavy wall pipes.

The corrosion resistance of the weld joints has been tested both in standard tests and in special environments, related to certain oil and gas wells. The tests were conclusive in that a welding procedure with the addition of sufficient amounts of filler metal should be employed.

TIG welds without or with marginal filler addition showed poor resistance to pitting, and to boiling nitric acid. Contents of main alloying elements in ferrite and austenite phases have been measured and causes of corrosion attack in welds are discussed. Some design considerations for perpendicular biased ferrite tuners. Recently remarkable progress has been achieved in the development of perpendicular biased ferrite tuned rf resonators for fast cycled synchrotrons.

Compared with the broadly used parallel biased rf cavities they provide higher resonator quality factor Q. However when designing perpendicular biased cavities, special attention should be paid to the methods to provide eddy current suppression in the resonator walls, the ferrite nonlinearity influence, the generated heat removal, the fast self resonant frequency control. The prospective of a faster additional biasing system are discussed and conclusions are drawn.

Study of some Mg-based ferrites as humidity sensors. We have found that the humidity sensitivity largely depends on composition, crystallite size, surface area and porosity. The best results concerning humidity sensitivity were obtained for MgMn 0. Temperature change of various ferrite particles with alternating magnetic field for hyperthermic application. Temperature changes under an alternating magnetic field were observed. In this article the main characteristics for emerging MnZn- ferrite applications are described on the basis of the new demands they possess on the ferrite material development.

A number of recently developed MnZn- ferrite materials is presented together with the main scientific principles lying behind their development. These include: i high saturation flux density MnZn- ferrites i. Minimizing magnetic field emissions to surroundings is one of the most challenging design criteria for wireless power transfer to vehicles.

In this paper, concept of division of the emissions into three zones primary, secondary, and combined zone in the vertical direction is introduced. For geo In this paper, concept of division of the emissions into three zones primary, secondary, and combined zone in the vertical direction is introduced It is observed that lower vertical separation results in higher overlapping of the zones and the coils behave as they are effectively placed close to center of air gap.

The analysis in this work provides a better understanding of the space Stainless steel tubes carrying raw water are potentially vulnerable to pitting corrosion. With a view to minimizing the corrosion risk in the river-water-cooled condensers at PWR power plant, a study was conducted to determine initiation conditions and incubation durations for pitting corrosion in stagnant water.

The same question can be yield for other applications and especially for all types of exchangers for use in electrical applications. This study sought to assess alternative methods for estimating pitting corrosion, and to check the results of these methods against the actual behaviour of studied steels.

Two approaches were adopted: laboratory tests to compare pitting corrosion risks on different materials, and tests for characterizing the behaviour of steels exposed to river water. The study begins with a laboratory tests that yield an arbitrary parameter for quantifying pitting corrosion resistance. One method involves measuring the pitting temperature in an aggressive ferric chloride solution. Other methods measure the pitting potential, either statistically Multipit method or deterministically polarization curve.

We then go on to discuss tests under simulated life-like conditions, involving repeated immersions in water from the Seine. The thermal decomposition process of the dried gel was studied by thermogravimetric analysis TGA and differential thermal analysis DTA. The obtained Ni 0. The magnetic properties of the nanocomposites are closely related to the ferrite content. Lithium ferrite : The study on magnetic and complex permittivity characteristics. Full Text Available Lithium ferrite Li0.

The spinel structure of the lithium ferrite was confirmed by X-ray diffraction and grain size estimation was obtained from scanning electron microscope SEM. Fourier transform infrared spectroscopy FTIR confirmed the presence of primary and secondary absorption bands characteristic for spinel structure. The force constants were estimated using absorption bands for the lithium ferrite.

Magnetization and dielectric studies were carried out for the sintered sample. Saturation magnetization Ms of Finite element analysis of multi-layer planar structures with Ferrite. Electromagnetic Analysis of microwave integrated circuits is an attractive subject do to the recent development and use of new materials such as magnetic anisotropic materials hexaferrite, These materials are used in many microwave components Determination of delta ferrite volumetric fraction in austenitic stainless steel.

The results obtained were comparated with point count, the reference method. It was also investigated in these measurements the influence of the martensite induced by mechanical deformation. Determinations by X-ray diffraction, by the ratio between integrated intensities of the ferrite and austenite lines, are in excelent agreement with those taken by point count.

It is demonstrated that, depending on the employed measurement method and surface finishing of the material to be analysed, the presence of martensite produced by mechanical deformation of the austenitic matrix is one problem to be considered. Author [pt. Highlights: Black-Right-Pointing-Pointer Cobalt ferrite nanoparticles are one of the most important materials for nanomedicine.

Black-Right-Pointing-Pointer They have high coercivity and moderate saturation magnetization. Black-Right-Pointing-Pointer Cobalt ferrite nanoparticles are synthesized easily. Black-Right-Pointing-Pointer They are a good candidate for hyperthermia and magnetic resonance imaging. Magnetoabsorption and magnetic hysteresis in Ni ferrite nanoparticles. This route of preparation has revealed to be one efficient and cheap technique to obtain high quality nickel ferrite nanosized powder.

Hysteresis loops have been obtained at room temperature with an inductive method. Magnetic field induced microwave absorption in nanoscale ferrites is a recent an active area of research, in order to characterize and explore potential novel applications. In the present work microwave magnetoabsorption data of the annealed nickel ferrite nanoparticles are presented. These data have been obtained with a system based on a network analyzer that operates in the frequency range 0 - 8.

At fields up to mT we can observe a peak according to ferromagnetic resonance theory. Sample annealed at higher temperature exhibits different absorption, coercivity and saturation magnetization figures, revealing its multidomain character. For preparing calcium ferrite , calcium tris maleato ferrate III precursor was prepared by mixing aqueous solutions of iron III maleate, calcium maleate and maleic acid.

Various physico-chemical techniques i. Determination of delta ferrite volumetric fraction in austenitic stainless steels. The evolution of ferrite grain size in structural steels. The refinement of the ferrite grain size is the main aim of modern thermomechanical processes for hot rolled steels.

A moving hearth 20 is positioned within the furnace housing A hood or separation barrier 30 within at least a portion of the conversion zone 13, fusion zone 14 or both separates the fusion zone 14 into an upper region and a lower region with the lower region adjacent the hearth 20 and the upper region adjacent the lower region and spaced from the hearth An injector introduces a gaseous reductant into the lower region adjacent the hearth Nanophase Iron Globules in Lunar Soil.

Micrometeoritic impacts on lunar soils produce melt and vapor. A patina of condensed vapor is deposited on lunar grains, the melt forms agglutinitic glass. In lunar soils, agglutinitic glass and rinds of grains host submicron-sized globules of pure Fe0 Fe-rich globules larger than 1 micron usually contain other elements such as Ni, P, and S.

Observation and measurement of such small size requires either back scattered electron BSE imaging with a high-resolution SEM or transmitted electron imaging with a TEM. The two techniques impose different limitations on the size-range of measurements. Therefore, Fe0 globules below 10nm in cross-sectional diameter are not truly measured.

The upper limit of a millimeter or so is not a hindrance. In fact, it is an advantage because whole grains can be observed and mapped at varying magnifications. Angstrom-scale resolution of TEM images is more than sufficient to observe and measure the smallest of Fe0 globules that are about 1nm in cross-section.

Microtoming edges of lunar grains; however, puts an upper size limitation of 50nm, at best, on the wafer, which more or less limits measuring Fe0 globules up to 30nm or so. Clearly, SEM and TEM techniques complement each other in obtaining the complete range of size distribution of Fe0 globules in lunar soils. Below we describe, in brief, our method of determining the size distribution of Fe0 globules in agglutinitic glass using BSE-SEM imaging and size measurement.

Although our work is incomplete, we also include a table of results obtained so far, which understandably would be refined as we collect more data. Metal regeneration of iron chelates in nitric oxide scrubbing. The process is useful to remove NO from flue gas and reduce pollution.

The present invention relates to a process of using metal particles to reduce NO to NH. Mammalian Cell Interactions with Nanophase Materials. Specifically, osteoblast. Reactive oxygen species-related activities of nano- iron metal and nano- iron oxides. Nano- iron metal and nano- iron oxides are among the most widely used engineered and naturally occurring nanostructures, and the increasing incidence of biological exposure to these nanostructures has raised concerns about their biotoxicity.

Reactive oxygen species ROS -induced oxidative stress is one of the most accepted toxic mechanisms and, in the past decades, considerable efforts have been made to investigate the ROS-related activities of iron nanostructures. In this review, we summarize activities of nano- iron metal and nano- iron oxides in ROS-related redox processes, addressing in detail the known homogeneous and heterogeneous redox mechanisms involved in these processes, intrinsic ROS-related properties of iron nanostructures chemical composition, particle size, and crystalline phase , and ROS-related bio-microenvironmental factors, including physiological pH and buffers, biogenic reducing agents, and other organic substances.

Published by Elsevier B. Metal-metal interaction mediates the iron induction of Drosophila MtnB. Metallothionein MT protein families are a class of small and universal proteins rich in cysteine residues. They are synthesized in response to heavy metal stresses to sequester the toxic ions by metal -thiolate bridges. These five isoforms of MTs are regulated by metal responsive transcription factor dMTF-1 and play differentiated but overlapping roles in detoxification of metal ions.

The induction of MtnB by iron turns out to be mediated by iron interference of other metals , because EDTA at even a partial concentration of that of iron can suppress this induction. Indeed, in the presence of iron , zinc homeostasis is altered, as reflected by expression changes of zinc transporters dZIP1 and dZnT1.

Thus, iron -mediated MtnB induction appears resulting from interrupted homeostasis of other metals such as zinc, which in turns induced MtnB expression. Metal-metal interaction may more widely exist than we expected.

Iron oxide minerals are the prime candidates for Fe III signatures in remotely sensed Martian surface spectra. Magnetic, Mossbauer, and reflectance spectroscopy have been carried out in the laboratory in order to understand the mineralogical nature of Martian analog ferric oxide minerals of submicron or nanometer size range.

Out of the iron oxide minerals studied, nanometer sized ferric oxides are promising candidates for possible Martian spectral analogs. Ferrihydrite, superparamagnetic particles of hematite, maghemite and goethite, and nanometer sized particles of inherently paramagnetic lepidocrocite are all examples of nanophase ferric oxides. Therefore, different np-Oxs preparations should be characterized using a more sensitive technique e.

The purpose of this study is to report the particle size, morphology and crystalline order, of five np-Ox samples by HRTEM imaging and electron diffraction ED. System and method for producing metallic iron nodules. A method for producing metallic iron nodules by assembling a shielding entry system to introduce coarse carbonaceous material greater than 6 mesh in to the furnace atmosphere at location s where the temperature of the furnace atmosphere adjacent at least partially reduced reducible iron bearing material is between about and Method and system for producing metallic iron nuggets.

A method and system for producing metallic iron nuggets may include providing multiple layers of agglomerates, such as briquettes, balls and extrusions, of a reducible mixture of reducing material such as carbonaceous material and of a reducible iron bearing material such as iron oxide on a hearth material layer such as carbonaceous material and providing a coarse overlayer of carbonaceous material over at least some of the agglomerates.

Heating the agglomerates of reducible mixture to Nanophase change for data storage applications. Phase change materials are widely used for date storage. The most widespread and important applications are rewritable optical disc and Phase Change Random Access Memory PCRAM , which utilizes the light and electric induced phase change respectively.

For decades, miniaturization has been the major driving force to increase the density. Now the working unit area of the current data storage media is in the order of nano-scale. On the nano-scale, extreme dimensional and nano-structural constraints and the large proportion of interfaces will cause the deviation of the phase change behavior from that of bulk.

Hence an in-depth understanding of nanophase change and the related issues has become more and more important. Nanophase change can be defined as: phase change at the scale within nano range of nm, which is size-dependent, interface-dominated and surrounding materials related. Nanophase change can be classified into two groups, thin film related and structure related.

Film thickness and clapping materials are key factors for thin film type, while structure shape, size and surrounding materials are critical parameters for structure type. In this paper, the recent development of nanophase change is reviewed, including crystallization of small element at nano size, thickness dependence of crystallization, effect of clapping layer on the phase change of phase change thin film and so on. The applications of nanophase change technology on data storage is introduced, including optical recording such as super lattice like optical disc, initialization free disc, near field, super-RENS, dual layer, multi level, probe storage, and PCRAM including, superlattice-like structure, side edge structure, and line type structure.

Future key research issues of nanophase change are also discussed. Method and system for producing metallic nuggets includes providing reducible mixture of reducing material such as carbonaceous material and reducible iron bearing material such as iron oxide that may be arranged in discrete portions, such as mounds or briquettes, on at least a portion of a hearth material layer such as carbonaceous material.

A coarse overlayer of carbonaceous material may be provided over at least some of the discrete portions. Heating the reducible mixture to Interactions between microbial iron reduction and metal geochemistry: effect of redox cycling on transition metal speciation in iron bearing sediments.

Microbial iron reduction is an important biogeochemical process that can affect metal geochemistry in sediments through direct and indirect mechanisms. This study demonstrates that a range of sorbed transition metals can be selectively sequestered into a 0.

Microbial reduction experiments with divalent Cd, Co, Mn, Ni, Pb, and Zn indicate that all metals save Mn experienced some sequestration, with the degree of metal incorporation into the 0. Microbial reduction alone resulted in a -3x increase in 0. The Center for Nanophase Materials Sciences. Operating as a national user facility, the CNMS supports a multidisciplinary environment for research to understand nanoscale materials and phenomena.

Simulant of lunar dust is needed when researching the lunar environment. However, unlike the true lunar dust, today s simulants do not contain nanophase iron. Two different processes have been developed to fabricate nanophase iron to be used as part of the lunar dust simulant: 1 Sequentially treating a mixture of ferric chloride, fluorinated carbon, and soda lime glass beads at about C in nitrogen, at room temperature in air, and then at C in nitrogen.

The product includes glass beads that are grey in color, can be attracted by a magnet, and contain alpha- iron nanoparticles which seem to slowly lose their lattice structure in ambient air during a period of 12 months. This product may have some similarity to the lunar glassy regolith that contains Fe sup 0.

This process simulates lunar dust reaction to the carbon in a micrometeorite at the time of impact. The product contains a chemically modified simulant that can be attracted by a magnet and has a surface layer whose iron concentration increased during the reaction. The iron was found to be alpha- iron and Fe3O4 nanoparticles, which appear to grow after the fabrication process, but stabilizes after 6 months of ambient air storage. Release of iron , zinc, and lead from common iron construction bars and zinc metallic bars in water solutions and meals.

The use of iron pots has decreased the prevalence of anemia. To investigate the release of iron , zinc, and lead from metallic iron and zinc bars incubated in water and in meals. Iron , zinc, and lead concentrations were measured at different incubation conditions in water and in meals. The iron concentration in water was 1. Lead was released from the bars, but at concentrations well below the upper tolerable limits.

In outreach populations, the use of iron and zinc metallic bars in water and meals could contribute to sustainable, very low-cost prevention of iron and zinc deficiencies, and home-fortified vinegar could be used for treatment of both deficiencies.

Field trials should be performed to determine the impact that the use of iron and zinc metallic bars in water and meals might have on the iron and zinc status of population groups. The article presents research data on manufacturing and application of metalized ore-coal pellets in synthetic pig iron smelting. A technology of pellets metallization by means of solid-phase reduction of iron from oxides using hematite-magnetite iron ore and low-caking coal as raw materials is described.

Optimal temperature and time conditions of feeding the metalized pellets into the furnace in smelting pig iron of SCh grade are determined. Nanophase and Composite Optical Materials. This talk will focus on accomplishments, current developments, and future directions of our work on composite optical materials for microgravity science and space exploration.

This research spans the order parameter from quasi-fractal structures such as sol-gels and other aggregated or porous media, to statistically random cluster media such as metal colloids, to highly ordered materials such as layered media and photonic bandgap materials. The common focus is on flexible materials that can be used to produce composite or artificial materials with superior optical properties that could not be achieved with homogeneous materials.

Applications of this work to NASA exploration goals such as terraforming, biosensors, solar sails, solar cells, and vehicle health monitoring, will be discussed. Metallic iron for water treatment: leaving the valley of confusion. Researchers on metallic iron Fe0 for environmental remediation and water treatment are walking in a valley of confusion for 25 years.

The partial analysis in turn has been undermining the scientific method while discouraging any real critical argumentation. Nanophase weathering products i. Furthermore, analyses of X-ray diffraction data measured by the CheMin instrument onboard the Mars Science Laboratory rover Curiosity indicate rock and soil samples are comprised of approx. Chemical measurements by landed missions indicate the presence of sulfur and phosphorus in martian rocks in soils, and APXS data from Gusev crater demonstrate abundances of up to approx.

However, the speciation of phosphorus and sulfur is not always evident. On Earth, phosphate and sulfate anions can be chemisorbed onto the surfaces of nanophase weathering products. This process may also occur on Mars, and calculations of the composition of the amorphous component at Gale crater using CheMin mineral models and APXS data show that amorphous material is enriched in volatiles, including S.

Here, we examine the ability to detect chemisorbed sulfate and phosphate complexes by analyzing sulfate- and phosphate-adsorbed nanophase weathering products using instruments similar to those on landed and orbital missions. Surveying the South Pole-Aitken basin magnetic anomaly for remnant impactor metallic iron. The Moon has areas of magnetized crust "magnetic anomalies" , the origins of which are poorly constrained.

A magnetic anomaly near the northern rim of South Pole-Aitken SPA basin was recently postulated to originate from remnant metallic iron emplaced by the SPA basin-forming impactor. Here, we remotely examine the regolith of this SPA magnetic anomaly with a combination of Clementine and Lunar Prospector derived iron maps for any evidence of enhanced metallic iron content. We find that these data sets do not definitively detect the hypothesized remnant metallic iron within the upper tens of centimeters of the lunar regolith.

Rampe, E. X-ray diffraction XRD data collected of the Rocknest samples by the CheMin instrument on Mars Science Laboratory suggest the presence of poorly crystalline or amorphous materials [1], such as nanophase weathering products or volcanic and impact glasses. The identification of the type s of X-ray amorphous material at Rocknest is important because it can elucidate past aqueous weathering processes.

The presence of volcanic and impact glasses would indicate that little chemical weathering has occurred because glass is highly susceptible to aqueous alteration. Furthermore, the types of weathering products present could help constrain pH conditions and identify which primary phases altered to form the weathering products.

The RIR of a mineral or mineraloid that relates the scattering power of that mineral typically the most intense diffraction line to the scattering power of a separate mineral standard such as corundum [2]. RIRs can be calculated from XRD patterns measured in the laboratory by mixing a mineral with a standard in known abundances and comparing diffraction line intensities of the mineral to the standard.

X-ray amorphous phases e. Thus, RIRs of X-ray amorphous materials are calculated by comparing the area under one of these broad scattering signals with the area under a diffraction line in the standard. Here, we measured XRD patterns of nanophase weathering products allophane, aluminosilicate gel, and ferrihydrite mixed with a mineral standard beryl in the CheMinIV laboratory instrument and calculated their RIRs to help constrain the abundances of these phases in.

Isolation and characterization of iron chelators from turmeric Curcuma longa : selective metal binding by curcuminoids. Iron overload disorders may be treated by chelation therapy. This study describes a novel method for isolating iron chelators from complex mixtures including plant extracts. We demonstrate the one-step isolation of curcuminoids from turmeric, the medicinal food spice derived from Curcuma longa.

The method uses iron -nitrilotriacetic acid NTA -agarose, to which curcumin binds rapidly, specifically, and reversibly. Curcumin, demethoxycurcumin, and bisdemethoxycurcumin each bound iron -NTA-agarose with comparable affinities and a stoichiometry near 1.

Analyses of binding efficiencies and purity demonstrated that curcuminoids comprise the primary iron binding compounds recovered from a crude turmeric extract. Competition of curcuminoid binding to the iron resin was used to characterize the metal binding site on curcumin and to detect iron binding by added chelators. Ranking of metals by relative potencies for blocking curcumin uptake agreed with their relative potencies in blocking curcumin binding to iron -NTA-agarose.

We conclude that curcumin can selectively bind toxic metals including iron in a physiological setting, and propose inhibition of curcumin binding to iron -NTA-agarose for iron chelator screening. Influence of nanophase titania topography on bacterial attachment and metabolism. Surfaces with nanophase compared to conventional or nanometer smooth topographies are known to have different properties of area, charge, and reactivity.

Previously published research indicates that the attachment of certain bacteria such as Pseudomonas fluorescens 5RL is higher on surfaces with nanophase compared to conventional topographies, however, their effect on bacterial metabolism is unclear.

Results presented here show that the adhesion of Pseudomonas fluorescens 5RL and Pseudomonas putida TVA8 was higher on nanophase than conventional titania. Importantly, in terms of metabolism, bacteria attached to the nanophase surfaces had higher bioluminescence rates than on the conventional surfaces under all nutrient conditions. Thus, the results from this study show greater select bacterial metabolism on nanometer than conventional topographies, critical results with strong consequences for the design of improved biosensors for bacteria detection.

The understanding of magnetism in strongly correlated electronic systems is a vital area of research. Not only is it linked to other phenomena like high temperature superconductivity in the cuprates and iron pnictides, but magnetic materials have been used in electronics since before the computer. As it becomes harder to prop up Moore's law by increasing the density of transistors, mankind must look towards new methods to improve technology or risk stagnation.

Research into alternative materials for technology, such as transition metal dichalcogenides, is a promising direction of research to maintain the rate of technological improvement. Our work focuses on the effect of iron intercalation in TiS2. Anisotropic susceptibility and magnetization measurements of the samples were measured, showing ferromagnetism and sharp switching behavior in the magnetization. Finally electrical transport measurements were taken, both with and without field.

Use of bimodal carbon distribution in compacts for producing metallic iron nodules. A method for use in production of metallic iron nodules comprising providing a reducible mixture into a hearth furnace for the production of metallic iron nodules, where the reducible mixture comprises a quantity of reducible iron bearing material, a quantity of first carbonaceous reducing material of a size less than about 28 mesh of an amount between about 65 percent and about 95 percent of a stoichiometric amount necessary for complete iron reduction of the reducible iron bearing material, and a quantity of second carbonaceous reducing material with an average particle size greater than average particle size of the first carbonaceous reducing material and a size between about 3 mesh and about 48 mesh of an amount between about 20 percent and about 60 percent of a stoichiometric amount of necessary for complete iron reduction of the reducible iron bearing material.

Reactions of metal ions at surfaces of hydrous iron oxide. Cu, Ag and Cr concentrations in natural water may be lowered by mild chemical reduction involving ferric hydroxide-ferrous ion redox processes. V and Mo solubilities may be controlled by precipitation of ferrous vanadate or molybdate. Concentrations as low as Deposition of manganese oxides such as Mn3O4 can be catalyzed in oxygenated water by coupling to ferrous-ferric redox reactions.

This reaction produces strongly oxidizing conditions at manganese oxide surfaces. The solubility of As is significantly influenced by ferric iron only at low pH. Spinel structures such as chromite or ferrites of Cu, Ni, and Zn, are very stable and if locally developed on ferric hydroxide surfaces could bring about solubilities much below Solubilities calculated from thermodynamic data are shown graphically and compared with observed concentrations in some natural systems.

Rescuing iron -overloaded macrophages by conservative relocation of the accumulated metal. The systemic misdistribution of iron , which is further exacerbated by parenteral iron supplementation, is mainly attributable to iron retention exerted on resident macrophages by hepcidin-mediated down-regulation of the iron exporter ferroportin.

We aimed at developing an experimental macrophage-based cell model that recapitulates pathophysiological features of iron misdistribution found in chronic disorders and use it as a screening platform for identifying agents with the potential for relocating the accumulated metal and restoring affected functions. KEY RESULTS This model provided a three-stage high throughput screening platform for identifying agents with the combined ability to: i scavenge cell iron and thereby rescue macrophage cells damaged by iron -overload; ii bypass the ferroportin blockade by conveying the scavenged iron to other iron -starved cells in co-culture via transferrin but iii without promoting utilization of the scavenged iron by intracellular pathogens.

As test agents we used chelators in clinical practice and found the oral chelator deferiprone fulfilled essentially all of the three criteria. The CNMS' scientific program has been developed through workshops with the national community, with the goal of creating a highly collaborative research environment to accelerate discovery and drive technological advances.

These include extensive synthesis and characterization capabilities for soft, hard, nanostructured, magnetic and catalytic materials and their composites; neutron scattering at the Spallation Neutron Source and High Flux Isotope Reactor; computational nanoscience in the CNMS' Nanomaterials Theory Institute and utilizing facilities and expertise of the Center for Computational Sciences and the new Leadership Scientific Computing Facility at ORNL; a new CNMS Nanofabrication Research Laboratory; and a suite of unique and state-of-the-art instruments to be made reliably available to the national community for imaging, manipulation, and properties measurements on nanoscale materials in controlled environments.

Metallic iron for environmental remediation: A review of reviews. This article critically evaluates recent review articles on using metallic iron Fe 0 for environmental remediation in order to provide insight for more efficient Fe 0 -based systems. The presentation is limited to peer-reviewed articles published during and , excluding own contributions, dealing mostly with granular Fe 0. The search yielded eight articles that met the final inclusion criteria.

The results of this evaluation indicate clearly that research on 'Fe 0 for environmental remediation' is in its infancy. Despite the current paucity of reliable data for the design of efficient Fe 0 -based systems, this review demonstrates that sensible progress could be achieved within a short period of time, specific recommendations to help guide future research are suggested.

All rights reserved. An iron -bearing material deriving from surface finishing operations in the manufacturing of cast- iron components demonstrates potential for removal of heavy metals from aqueous waste streams. Batch isotherm and rate experiments were conducted for uptake of cadmium, zinc, and lead Microscopic iron metal on glass and minerals - A tool for studying regolith maturity.

A novel method of producing mixtures of glass or minerals with iron metal is presented. Part of the iron metals forms rounded submicrometer blebs on the surfaces and in some cases within the grains. A concentration of such blebs equivalent to percent of a grain's surface area can totally dominate the reflectance spectra of basaltic glass, pyroxene, and olivine. Electrochemical synthesis of hard-alloy compositions based on tungsten carbide and an iron triad metal.

Single and cyclic voltammetry is used to study the electrode processes that occur during electrochemical synthesis of hard-alloy compositions based on tungsten carbide and an iron triad metal in tungstate and tungstate-carbonate Na2WO4-Li2WO4-Li2CO3 5. The conditions of bringing the electroprecipitation potentials of tungsten, carbon, and an iron triad metal into coincidence are determined. Raman Mapping for the Investigation of Nano-phased Materials.

Nanosized and nanophased materials exhibit special properties. First they offer a good compromise between the high density of chemical bonds by unit volume, needed for good mechanical properties and the homogeneity of amorphous materials that prevents crack initiation. Second, interfaces are in very high concentration and they have a strong influence on many electrical and redox properties.

The analysis of nanophased , low crystallinity materials is not straigtforward. The recording of Raman spectra with a geometric resolution close to 0. Case studies are discussed: advanced polymer fibres, ceramic fibres and composites, textured piezoelectric ceramics and corroded ancient steel.

In the present paper, we briefly review the current literature examining the mechanisms by which iron oxides recrystallize and summarize how recrystallization affects metal incorporation and release. Multiscale correlations of iron phases and heavy metals in technogenic magnetic particles from contaminated soils.

Technogenic magnetic particles TMPs are carriers of heavy metals and organic contaminants, which derived from anthropogenic activities. However, little information on the relationship between heavy metals and TMP carrier phases at the micrometer scale is available. Multiscale correlations of heavy metals in TMPs were elucidated using wavelet transform analysis.

Fluorescence mapping and wavelet analysis showed that ferroalloy was a major magnetic signature and heavy metal carrier in TMPs, because most heavy metals were highly associated with ferroalloy at all size scales. Multiscale analysis revealed that heavy metals in the TMPs were from multiple sources. The relative percentage of these magnetic phases depended on their emission sources. Heatmap analysis revealed that Co, Pb, Cu, Cr, and Ni were mainly derived from ferroalloy particles, while As was derived from both ferroalloy and metallic iron phases.

Our results indicated the scale-dependent correlations of magnetic phases and heavy metals in TMPs. The combination of synchrotron based X-ray microprobe techniques and multiscale analysis provides a powerful tool for identifying the magnetic phases from different sources and quantifying the association of iron phases and heavy metals at micrometer scale. Electrochemical water splitting requires efficient water oxidation catalysts to accelerate the sluggish kinetics of water oxidation reaction.

The as-prepared core-shell nickel- iron -copper electrode is characterized with porous oxide shells and metallic cores. This tri- metal -based core-shell nickel- iron -copper electrode exhibits a remarkable activity toward water oxidation in alkaline medium with an overpotential of only mV at a current density of 10 mA cm To the best of our knowledge, the as-fabricated core-shell nickel- iron -copper is one of the most promising oxygen evolution catalysts.

The core-shell NiFeCu electrode exhibits pH-dependent oxygen evolution reaction activity on the reversible hydrogen electrode scale, suggesting that non-concerted proton-electron transfers participate in catalyzing the oxygen evolution reaction. Causes of low iron levels include blood loss, poor diet, or an inability to absorb enough iron from foods.

People at higher risk of having too little iron are young children and women who are pregnant or have periods. Nanophase hydroxyapatite coatings for dental and orthopedic applications. In order to improve dental and orthopedic implant performance, the objective of this study was to synthesize nanocrystalline hydroxyapatite HA powders to coat metals specifically, titanium and tantalum.

Some of the UltraCaP and nanocrystalline HA powders were doped with yttrium Y since previous in vitro studies demonstrated that Y-doped HA in bulk improved osteoblast or bone-forming cell function over undoped HA. These powders were then deposited onto titanium by a novel room-temperature process, called IonTiteT TM. The results demonstrated that the chemical properties and crystallite size of the original HA powders were maintained in the coatings.

Results further demonstrated greater amounts of calcium deposition by osteoblasts cultured on nanocrystalline HA coatings compared to UltraCaP coatings and conventionally used plasma-sprayed HA coatings. To elucidate mechanisms that influenced osteoblast functions on the HA coatings, the amount of proteins fibronectin and vitronectin onto the HA powders and the adsorbed fibronectin conformation were investigated.

Exposure of cell integrin binding domains in fibronectin III10 segments was greater in fibronectin adsorbed onto 1. However, 1. Experimental segregation of iron -nickel metal , iron -sulfide, and olivine in a thermal gradient: Preliminary results. Speculation about the possible mechanisms for core formation in small asteroids raises more questions than answers.

Petrologic evidence from iron meteorites, pallasites, and astronomical observations of M asteroids suggests that many small bodies were capable of core formation. Taylor's evaluation suggests that extensive silicate partial melting preferably 50 vol. Taylor points out that for these metal spherules to sink through a silicate mush, high degrees of silicate partial melting are required to lower the silicate yield strength.

Although some qualitative experimental data exists, little is actually known about the behavior of metals and liquid sulfides dispersed in silicate systems. In addition, we have been impressed with the ability of cumulative olivine to expel trapped liquid when placed in a thermal gradient. From iron coordination compounds to metal oxide nanoparticles. Various types, shapes and sizes of iron oxide nanoparticles were obtained depending on the nature of the precursor, preparation method and reaction conditions.

Five series of nanoparticle samples were prepared employing either a classical thermal pathway i. The resulting materials were structurally characterized by wide-angle X-ray diffraction and Fourier transform infrared, Raman, energy-dispersive X-ray, and X-ray fluorescence spectroscopies, as well as thermogravimetric analysis. The morphology was characterized by transmission electron microscopy, atomic force microscopy and dynamic light scattering. The parameters were varied within each route to fine tune the size and shape of the formed nanoparticles.

Metal matrix composite of an iron aluminide and ceramic particles and method thereof. A metal matrix composite comprising an iron aluminide binder phase and a ceramic particulate phase such as titanium diboride, zirconium diboride, titanium carbide and tungsten carbide is made by heating a mixture of iron aluminide powder and particulates of one of the ceramics such as titanium diboride, zirconium diboride, titanium carbide and tungsten carbide in a alumina crucible at about The ceramic particulates comprise greater than 40 volume percent to about 99 volume percent of the metal matrix composite.

A metal matrix composite comprising an iron aluminide binder phase and a ceramic particulate phase such as titanium diboride, zirconium diboride, titanium carbide and tungsten carbide is made by heating a mixture of iron aluminide powder and particulates of one of the ceramics such as titanium diboride, zirconium diboride, titanium carbide and tungsten carbide in a alumina crucible at about 1, C for about 15 minutes in an evacuated furnace and cooling the mixture to room temperature.

Effects of sulfate on heavy metal release from iron corrosion scales in drinking water distribution system. Trace heavy metals accumulated in iron corrosion scales within a drinking water distribution system DWDS could potentially be released to bulk water and consequently deteriorate the tap water quality.

The objective of this study was to identify and evaluate the release of trace heavy metals in DWDS under changing source water conditions. Experimental pipe loops with different iron corrosion scales were set up to simulate the actual DWDS. The effects of sulfate levels on heavy metal release were systemically investigated. Heavy metal releases of Mn, Ni, Cu, Pb, Cr and As could be rapidly triggered by sulfate addition but the releases slowly decreased over time. Heavy metal release was more severe in pipes transporting groundwater GW than in pipes transporting surface water SW.

The main functional iron reducing bacteria IRB communities were favorable for the formation of Fe 3 O 4. The transformation of corrosion scales and the growth of sulfate reducing bacteria SRB accounted for the gradually reduced heavy metal release with time. The higher metal release in pipes transporting GW could be due to increased Fe 6 OH 12 CO 3 content under higher sulfate concentrations.

Cherkezova-Zheleva, Z. The chosen synthesis conditions resulted in the formation of nanosized supported phases— iron oxide in the one-component samples , or iron oxide-noble metal in the two-component ones. Different agglomeration degrees of these phases were obtained as a result of thermal treatment. Ultradisperse size of the supported phase was maintained in some samples, while a process of partial agglomeration occurred in others, giving rise to nearly bidisperse ultra-and highdisperse supported particles.

The different texture of the used supports and their chemical composition are the reasons for the different stability of the nanosized supported phases. The samples were tested as heterogeneous catalysts in total benzene oxidation reaction. Effects of thermomechanical processing on strength and toughness of iron - percent-nickel - reactive metal alloys at C. Thermomechanical processing TMP was evaluated as a method of strengthening normally tough iron nickel-reactive metal alloys at cryogenic temperatures.

Five iron nickel alloys with reactive metal additions of aluminum, niobium, titanium, vanadium, and aluminum plus niobium were investigated. Primary evaluation was based on the yield strength and fracture toughness of the thermomechanically processed alloys at C. The divalent metal transporter-1 DMT1 participates in the detoxification of metals that can damage lung epithelium. Elevated iron levels increase the expression of DMT1 in bronchial epithelial cells stimulating its uptake and storage in ferritin, thus making iron unavailable t Redox switching and oxygen evolution at oxidized metal and metal oxide electrodes: iron in base.

Outstanding issues regarding the film formation, redox switching characteristics and the oxygen evolution reaction OER electrocatalytic behaviour of multicycled iron oxyhydroxide films in aqueous alkaline solution have been revisited. The oxide is grown using a repetitive potential multicycling technique, and the mechanism of the latter hydrous oxide formation process has been discussed. The hydrous oxide is considered as a porous assembly of interlinked octahedrally coordinated anionic metal oxyhydroxide surfaquo complexes which form an open network structure.

The latter contains considerable quantities of water molecules which facilitate hydroxide ion discharge at the metal site during active oxygen evolution, and also charge compensating cations. The dynamics of redox switching has been quantified via analysis of the cyclic voltammetry response as a function of potential sweep rate using the Laviron-Aoki electron hopping diffusion model by analogy with redox polymer modified electrodes.

Steady state Tafel plot analysis has been used to elucidate the kinetics and mechanism of oxygen evolution. Tafel slope values of ca. These observations are rationalised in terms of a kinetic scheme involving Temkin adsorption and the rate determining formation of a physisorbed hydrogen peroxide intermediate on the oxide surface.

The dual Tafel slope behaviour is ascribed to the potential dependence of the surface coverage of adsorbed intermediates. Kubuki, Shiro, E-mail: kubuki tmu. Synthesis and electronic properties of nanophase semiconductor materials. The objective of the research effort is to understand and learn to control the morphologic and electronic properties of electrodeposited nanophase semiconductors.

The initial work has focused on electrodeposition of nanophase CdSe, using a sequential monolayer deposition technique that we are developing. We are currently extending the synthesis phase of this project into silicon, silicon carbide, and phosphor materials. This work also encompasses studying semiconductor electrodeposition into materials with restricted dimensions, such as microporous alumina and porous silicon membranes.

By growing films with very small grain sizes, we hope to produce and study materials that display unusual electronic or luminescent effects. We are primarily interested in the electronic properties of the II-VI and group IV materials, for potential applications in nanoscale electronics and optical detector technologies. The phosphors are being studied for their potential as efficient high-resolution display materials. Guidelines for Americans and the U. Department of Agriculture's MyPlate.

Where can I find out more about Removal of metals from landfill leachate by sorption to activated carbon, bone meal and iron fines. Sorption filters based on granular activated carbon, bone meal and iron fines were tested for their efficiency of removing metals from landfill leachate. Ca, Pb, Sr and Zn were removed but less efficiently. All materials released unwanted substances metals , TOC or nutrients , highlighting the need to study the uptake and release of a large number of compounds, not only the target metals.

To remove a wide range of metals using these materials two or more filter materials may need to be combined. Sorption mechanisms for all materials include ion exchange, sorption and precipitation. For iron fines oxidation of Fe 0 seems to be important for metal immobilisation. System and method for making metallic iron with reduced CO.

A method and system for making metallic iron nodules with reduced CO. The method includes: assembling a linear hearth furnace having entry and exit portions, at least a conversion zone and a fusion zone, and a moving hearth adapted to move reducible iron bearing material through the furnace on contiguous hearth sections; assembling a shrouded return substantially free of air ingress extending adjacent at least the conversion and fusion zones of the furnace through which hearth sections can move from adjacent the exit portion to adjacent the entry portion of the furnace; transferring the hearth sections from the furnace to the shrouded return adjacent the exit portion; reducing reducible material in the linear hearth furnace to metallic iron nodules; and transporting gases from at least the fusion zone to the shrouded return to heat the hearth sections while in the shrouded return.

Interaction between tungsten monocarbide and an iron -based metallic melt. A technique and results of investigation of compacted tungsten carbide substrates by scanning microscopy are reported. Samples are prepared in the course of studies of the wettability of tungsten carbide substrates with the iron melt, which are performed in accordance with the sessile drop method using two different heating strategies, namely, contact and noncontact heating of metal.

To evaluate the importance of external mass transport on the overall rates of contaminant reduction by iron metal Fe 0 , we have compared measured rates of surface reaction for nitrobenzene ArNO 2 to estimated rates of external mass transport Active catalysts of sonoelectrochemically prepared iron metal nanoparticles for the electroreduction of chloroacetates.

A new methodology for the sonoelectro-deposition and stripping of highly reactive iron at boron-doped diamond electrodes has been studied. In aqueous 1 M NH4F iron metal readily and reversibly electro-deposits onto boron-doped diamond electrodes. The effects of deposition potential, FeF concentration, deposition time, and mass transport are investigated and also the influence of power ultrasound 24 kHz, 8 Wcm Scanning electron microscopy images of iron nanoparticles grown to typically nm diameters are obtained.

It is shown that a strongly and permanently adhering film of iron at boron-doped diamond can be formed and transferred into other solution environments. The catalytic reactivity of iron deposits at boron-doped diamond is investigated for the reductive dehalogenation of chloroacetate.

The kinetically limited multi-electron reduction of trichloroacetate is dependent on the FeF deposition conditions and the solution composition. It is demonstrated that a stepwise iron -catalysed dechlorination via dichloroacetate and monochloroacetate to acetate is feasible. This sonoelectrochemical methodology offers a novel, clean and very versatile electro-dehalogenation methodology. The role of fluoride in the surface electrochemistry of iron deserves further attention.

Iron isotopic fractionation between silicate mantle and metallic core at high pressure. However, the extent of iron isotopic fractionation between molten metal and silicate under high pressure—temperature conditions is poorly known. Here we show that iron forms chemical bonds of similar strengths in basaltic glasses and iron -rich alloys, even at high pressure. This result is unaffected by small amounts of nickel and candidate core-forming light elements, as the isotopic shifts associated with such alloying are small.

This study suggests that the variability in iron isotopic composition in planetary objects cannot be due to core formation. The substitution of expensive and potentially toxic noble- metal catalysts by cheap, abundant, environmentally benign, and less toxic metals is highly desirable and in line with green chemistry guidelines. In addition, we have discovered long-range metal -ligand cooperation in acridine-based pincer ligands, where the cooperation takes place at the electrophilic C-9 position of the acridine moiety leading to dearomatization of its middle ring.

This unusual reactivity likely takes place in various catalytic hydrogenation, dehydrogenation, and related reactions. In this Account, we summarize our studies on novel bifunctional iron PNP and PNN pincer complexes, which were designed on the basis of their ruthenium congeners. Iron PNP pincer complexes serve as efficient pre catalysts for hydrogenation and dehydrogenation reactions under remarkably mild conditions.

Their catalytic applications include atom-efficient and industrially important hydrogenation reactions of ketones, aldehydes, and esters to the corresponding alcohols. Moreover, they catalyze the hydrogenation of carbon dioxide to sodium formate in the presence of sodium hydroxide, the selective decomposition of formic acid to carbon dioxide and hydrogen, and the E-selective semihydrogenation of alkynes to give E-alkenes.

These catalysts feature, compared to other iron -based catalysts, very high catalytic activities which in. Mikouchi, T. Almahata Sitta AS is a polymict breccia mainly composed of variable ureilite lithologies with small amounts of chondritic lithologies [1].

Fe metal is a common accessory phase in ureilites, but our earlier study on Fe metals in one of AS fragments 44 revealed a unique mineralogy never seen in other ureilites [2,3]. In this abstract we report detailed transmission electron microscopy TEM on these metal grains to better understand the thermal history of ureilites. One of the FIB sections shows a submicron-sized symplectic intergrown texture composed of Fe metal kamacite , Fe carbide cohenite , Fe phosphide schreibersite , and Fe sulfide troilite.

Each phase has an identical SAED pattern in spite of its complex texture, suggesting co-crystallization of all phases. The elongated alpha-Fe grains show tweed-like structures suggesting martensite transformation. Such a texture can be formed by rapid cooling from high temperature where gamma-Fe was stable. Subsequently alpha-Fe crystallized, but gamma-Fe remained in the interstitial matrix due to quenching from high temperature. This scenario is consistent with very rapid cooling history of ureilites suggested by silicate mineralogy.

Hydrogen sulfide conversion with nanophase titania. Other transition metal catalysts are disclosed, each of nanocrystalline material with grain sizes in the nm range. A process for disassociating H. Oxygen and iron abundances in two metal -poor dwarfs. Model atmospheres with Te of were appropriate to both stars, whose metallicities were found to be These oxygen abundances are 0.

In addition Pb corrosion products may be sinks for other metals such as chromium Cr , copper Cu , manganese Mn , and zinc Zn. Formation of iron metal and grain coagulation in the solar nebula. The interstellar grain population in the giant molecular cloud from which the sun formed contained little or no iron metal. However, thermal processing of individual interstellar silicates in the solar nebula is likely to result in the formation of a population of very small iron metal grains.

If such grains are exposed to even transient magnetic fields, each will become a tiny dipole magnet capable of interacting with other such dipoles over spatial scale orders of magnitude larger than the radii of individual grains. Such interactions will greatly increase the coagulation cross-section for this grain population. Furthermore, the magnetic attraction between two iron dipoles will significantly increase both the collisional sticking coefficient and the strength of the interparticle binding energy for iron aggregates.

Formation of iron metal may therefore be a key step in the aggregation of planetesimals in a protoplanetary nebula. Such aggregates may have already been observed in protoplanetary systems. The enhancement in the effective interaction distance between two magnetic dipoles is directly proportional to the strength of the magnetic dipoles and inversely proportional to the relative velocity.

We are in the process of measuring the degree of coagulation in our condensation flow apparatus as a function of applied magnetic field and correlating these results by means of magnetic remanance acquisition measurements on our iron grains with the strength of the magnetic field to which the grains are exposed.

Results of our magnetic remanance acquisition measurements and the magnetic-induced coagulation study will be presented as well as an estimate of the importance of such processes near the nebular midplane. However, questions pertaining to fundamental and practical aspects of their reactivity may limit their performance during applications.

For NZVI treatment of pollutant source zones, a major hurdle is its limited reactive lifetime. In Chapter 3, we show that dithionite, previously utilized for in situ redox manipulation, can restore the reducing capacity of passivated NZVI treatment systems.

Reduction of this passive layer by low dithionite concentrations restored suspension reactivity to levels of unaged NZVI, with multiple dithionite additions further improving pollutant removal. Sorption of Cu. The magnetohydrodynamic force experienced by spherical iron particles in liquid metal.

The paper contains a theoretical investigation of magnetohydrodynamic force experienced by iron particles well-conducting and ferromagnetic in well-conducting liquid. The investigation is performed by extending the Leenov and Kolin's theory to take into account the second-order effect.

Therefore, the limits of the parent model are taken over to the present results.

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But in the movie one can find the lack of strong emotions. It seems that the director churned a boring affair into an okay watch. While one of the most senior music directors of Tollywood MM Keeravani composed music for this film, Ananth Sriram, one among the youngest lyric writers had written the lyrics for this film.

Read more Tony Stark Robert Downey, Jr. In between the hustle and bustle of waiters doing their job, of wealthy types socializing, of journalists rumormongering, Tony and Pepper go about a continuous banter on some things and nothings while Natalie disappears into the vibrant crowd. The couple walks towards the bar where Justin Hammer Sam Rockwell , Tony's business rival, is animatedly conversing with a journalist, who upon being introduced to Tony by the forcedly courteous Justin, shifts her attention to the newcomer much to Justin's well-hidden chagrin.

The rather talkative sequence stretches up to the moment Ivan Vanko Mickey Rourke , a Russian scientist whose personal vendetta with Tony has something to do with stolen patents and intellectual property, appears, apparently to wreak havoc. Before thinking that the described sequence belongs to one of the Robert Altman-inspired commentaries on the dehumanizing repercussions of big business and the celebrity that results out of it, it must be clarified that the scene belongs to the sequel to the screen adaptation of one of Marvel Comics' most unwieldy superheroes.

Iron Man 2 , unlike its predecessor which delivered precisely the pure and unadulterated entertainment it promised, is a conundrum. While it is evidently still a superhero movie, it often indulges in these perfunctory scenes of endless chatter between its characters. These scenes are not indispensable either to plot or spectacle.

In fact, apart from the fact that they insubstantially detail the extent of the characters' quirks and personalities Tony, as an egotistical jerk; Pepper, as a hypertensive worrywart; etc. It is safe to say that the sequel will not be as well-loved as its very successful predecessor. The mumble, unfortunately, is empty, more like an attempt at banal humor or a soundtrack to the noises and explosions than a wellspring of wisdom.

The action scenes, which are very few and far apart, are mostly flat and unsatisfying, just a cornucopia of expensive eye-candy mixed with middling stunts. Moreover, that most of the action only involves men inside metal armors fighting robots enunciate the inconsequence of the battles, given that sweat, blood, or pain are practically eliminated. At least Altman's film looks and feels like a pariah in its genre, which is probably why it was not received well when it was released or it has been taking decades for it to be taken seriously.

It has themes of seeming relevance in the current world scenario, like that of war, the greed that it invites, and a host of other things, is more of an echo of a trend among comic book films to have pertinent messages to escape the stigma of these films being only for kids than anything else.

That said and in all honestly, half of me admires the audacity of Favreau to indulge in atypical talkativeness in a special effects-laden picture that will always sell whether or not it has anything intelligent or logical to say. The other half wishes that Favreau had done more than blankly emulate Altman.

His life takes a little turn when he decides to marry a city girl from Hyderabad and fall in love with Divya Nidhi when he reaches the city. He proposes to her and is surprised to know there are three others Amit, Samrat, Sri Akshay in the race. Divya invites all of them for a test. Who wins the test and tie the knot forms the rest of the story.

Allari Naresh, as usual gave his best energetic performance. He carried the whole movie on his shoulders. Nidhi has beautiful eyes and very sweet expressions but not so impressive as a heroine must have otherwise her performance is good. Amit looks handsome and his dialogue delivery is also strong. He fits the role very well and he can take up few meatier roles and for a change anything with positive traits will do him good.

Samrat is tall and handsome but has a strained body language. If he can pump some confidence in his body language then it could work well Sri Akshay have good looks and also performed satisfactorily well with his dialogue delivery and other aspects of acting. Raghu Babu has a busy day and he entertains to a great extent in the second half, Krishna Bhagawan was witty, Kota was standard, the ladies did their bit as required.

Pilla Prasad, Vijay Sai were okay. The film is basically a comedy treat and enough attempts have been made to keep the smile intact on the faces of the audience. Cinematography was neat, background score was okay and one song is worth taking home. Also, the pace of the film was mild and if there was speed in it, the impact would have been much stronger. However, eventually it settles down in familiar territory. Housefull narrates the tale of Aarush Akshay , a perpetually unlucky bloke and a loser in life who moves into the house of his best buddy cum another loser, Bob Ritesh and his wife Hetal Lara.

But things continue to go wrong for Aarush. Convinced that true love can fade away his bad luck jinx, a desperate Aarush enters into many complicated situations while seeking it. Thus enter Sandy Deepika and Devika Jiah in his life.

How Aarush and Bob in an attempt to hoodwink Krishna Rao and Batuk go on creating more confusion leading to a mirthful chaos forms the rest of the plot. Though he has not entirely let us down, you do wish he could have opted for a more innovative plot. The second half ends up being more of an Anees Bazmee film what with characters trying to hide identities and going on a lying spree. Sajid Khan also seems to have taken the slap stick humour bit quiet seriously what with so many slaps happening within the film.

To give Sajid due credit, he has created many rip roaringly funny situations that are further elevated by his actors. Amongst the most hilarious sequences are most of the scenes featuring Akshay and Ritesh together. They share terrific chemistry. The film is high on glamour quotient what with three attractive bodied heroines Deepika, Lara and Jiah parading in skimpy outfits most of the time. Akshay Kumar is back in terrific form, evoking huge laughter with his poker faced humour.

Ritesh Deshmukh is another great comic talent who often gets his timing right. Arjun Rampal suits the part and looks dapper. While Deepika looks sizzling hot, Lara manages to score over her in the comedy department. Jiah tries hard and ends up being just about passable. Boman Irani goes over the top as usual. Chunky Pandey is plain irritating playing Akhiri Pasta an Italian hotelier. His fake Italiano accent grates on your nerves. Mika sung foot tapping number Apni To Jaise Taise featuring Jacqueline Fernandez is a sure shot chartbuster and is fun to watch on screen.

The editing could have been tighter especially in the first half. Finally, what makes Housefull a watchable film is the fact that it aims to entertain and succeeds in doing so irrespective of its negative points. Anuuj J. Chase begins with a high-octane chase and what follows are several twists-n-turns, before the jigsaw puzzle is solved.

But the question is, does Chase provide those adrenaline-pumping moments? Nope, it doesn't! The problem is, the writing relies too heavily on the tried-n-tested stuff, which robs this thriller of those thrilling moments. Final word? Chase is akin to soda. Opens with a lot of fizz, but falls flat thereafter! Sohail [Anuuj Saxena] is a man on the run. Enter Nupur [Udita Goswami], who is involved with Sohail closely.

The other players of this chase are Surabhee [Tarina Patel], Sohail's love interest and industrialist Mr. Khanna [Aditya Raj Kapoor], for whom money is the solution of all problems. The hunt for Sohail and search for truth takes us through the streets of Mumbai. The truth has the potential of blowing up the entire political system apart. Who is the victim and who is the criminal? The sole aspect you carry home after watching Chase are the high-octane chase sequences, especially the one at the very start of the film.

Otherwise, Chase harps on the age-old plot where an innocent man is framed for a murder he hasn't committed, the corrupt cops being hand-in-glove with an industrialist, an undercover cop who doubles up as a seductress and the journo-girlfriend who goes that extra mile to save her boyfriend. Director Jag Mundhra has shot a few sequences well, but the writing doesn't hold.

Anuuj tries too hard to act, but can't. Udita is credible, as always. Tarina Patel looks ill at ease. Gulshan Grover is wasted. Rajesh Khattar infuses life in his part. He's competent. Ditto for Samir Kochhar, who's equally confident. Aditya Raj Kapoor is quite good. On the whole, Chase lacks face-value as well as merits. Besides, with an opposition like Housefull, Chase stands no chance.

Posted by Jb at PM 0 comments Labels: bollywood. Years ago, my friends often shot amateur videos involving themselves on a handycam. The laughter while watching the amateur videos still resonates in my ears. Memories of those days flashed in front of my eyes as reel after reel of Kuchh Kariye unfolded. What happens when an amateur director, an amateur writer and a bunch of amateur actors join hands?

It results in a film called Kuchh Kariye, which, very frankly, makes no sense at all. As someone who has been an ardent admirer of his singing, I felt pained to see him cast in a film that has an apology of a script and non-existent direction.

As for Sukhwinder's acting skills, the less said the better. He is expressionless, flaunts his physique like Salman Khan and wears garish outfits. My sincere and humble advice to Sukhwinder is, stick to singing! They leave their hometown for better prospects. They decide to make a film to bring about a change in society. But a terror attack changes everything. It's difficult to categorise Kuchh Kariye in any particular genre. The story changes so rapidly and so haphazardly that you're clueless about the on-screen goings-on.

In fact, not one department in the film is worth highlighting. The acting too touches a new low. The CRM interaction occurs between the rotating electron beam and the em wave propagating along a longitudinally magnetized ferrite medium. The ferrite anisotropic permeability resembles the CRM susceptibility in many aspects, and particularly in their similar response to the axial magnetic field the ferrite susceptibility can be regarded as a passive analog of the active CRM interaction.

The ferrite loading slows down the phase velocity of the em wave and thus the axial Weibel mechanism of the CRM interaction dominates. The ferrite loading enables also a mechanism of spectral tunability for CRM's. The ferrite loading is proposed, therefore, as a useful ingredient for high-power CRM devices.

A linear model of the combined ferrite -guided CRM interaction reveals its useful features. Future schemes may also incorporate ferrite sections functioning as isolators, gyrators, or phase shifters within the CRM device itself for selective suppression of backward waves and spurious oscillations, and for gain and efficiency enhancement.

Full Text Available The article focuses on the microwave measurements performed on the nickel-zinc sintered ferrite with the chemical formula Ni0. The apparatus for measurement of the signal proportional to the absolute value of scattering parameter S11 reflexion coefficient is described and the dependence of measured reflected signal on a bias magnetic field has been studied.

By means of experiments, the resonances to be connected with the geometry of microwave experimental set-up were distinguished from ferromagnetic resonance arising in ferrite particles of composite structure. The role of local interaction fields of ferrite particles in composite material has been discussed.

Delta ferrite in the weld metal of reduced activation ferritic martensitic steel. Sam, Shiju, E-mail: shiju ipr. Composition of the alloy is such that delta- ferrite is not expected in the alloy; but examination of the weld metal revealed presence of delta- ferrite in the weld metal. Volume fraction of delta- ferrite is found to be higher in the weld interface than in the rest of the fusion zone.

Decrease in the volume fraction of delta- ferrite , with an increase in preheat temperature or with an increase in heat input, is observed. Results indicate that the cooling rate experienced during welding affects the volume fraction of delta- ferrite retained in the weld metal and variation in the delta- ferrite content with cooling rate is explained with variation in the time that the weld metal spends in various temperature regimes in which delta- ferrite is stable for the alloy during its cooling from the liquid metal to the ambient temperature.

This manuscript will discuss the effect of welding parameters on formation of delta- ferrite and its retention in the weld metal of RAFM steel. Growth modes of individual ferrite grains in the austenite to ferrite transformation of low carbon steels. The simulations demonstrated that both the hard impingement ferrite grain coarsening and the soft impingement overlapping carbon concentration field have a great influence on the individual ferrite growth behavior.

Generally, ferrite grains displayed six modes of growth behavior: parabolic growth, delayed nucleation and growth, temporary shrinkage, partial shrinkage, complete shrinkage and accelerated growth in the transformation. Some modes have been observed before by the synchrotron X-ray diffraction experiment.

The mesoscopic simulation provides an alternative tool for investigating both the individual grain growth behavior and the overall transformation behavior simultaneously during transformation. The damping of higher-order modes in the superconducting five-cell cavity for the Energy-Recovery linac at RHIC is performed exclusively by two ferrite absorbers.

The ferrite properties have been measured in ferrite -loaded pill box cavities resulting in the permeability values given by a first-order Debye model for the tiled absorber structure and an equivalent permeability value for computer simulations with solid ring dampers. Measured and simulated results for the higher-order modes in the prototype copper cavity are discussed.

First room-temperature measurements of the finished niobium cavity are presented which confirm the effective damping of higher-order modes in the ERL. Oxide dispersion-strengthened ferritic alloys. The publication gives the available data on the DTO2 dispersion-strengthened ferritic alloy developed at C.

Mol, Belgium. DTO2 is a Fe-Cr-Mo ferritic alloy, strengthened by addition of titanium oxide and of titanium leading to the formation of Chi phase. It was developed for use as canning material for fast breeder reactors. Micromagnetic simulations of spinel ferrite particles. This paper presents the results of simulations of the magnetization field ac response at GHz of various submicron ferrite particles cylindrical dots.

These runs represent full 3D micromagnetic one-particle ferrite simulations. We find that the main resonance peak of the Fe 3 O 4 one-particle simulation is disfigured in the corresponding 3 by 3 particle simulation, indicating the extent to which dipolar interactions are able to affect the main resonance peak in that magnetic compound.

Characterization of Austempered Ferritic Ductile Iron. The ductile iron DI has graphite nodules enclose in ferrite envelop in pearlitic matrix. The pearlitic matrix in DI was converted to ferritic matrix through heat treatment. The new heat treated DI has graphite nodules in ferritic matrix and called as ferritic ductile iron FDI. The samples were soaked in salt bath for 60, , , and min followed by air cooling.

The austempered samples were characterized with help of optical microscopy, SEM and X-ray diffraction analysis. Austempering of ferritic ductile iron resulted in finer ausferrite matrix as compared to ADI. The area fraction of graphite remains unaffected due to austempering heat treatment. Bulk hardness test was carried on Rockwell Hardness Tester with load of kgf and diamond indenter. Hardness is improved by austempering process.

Dielectric properties of Al-substituted Co ferrite nanoparticles. The particle size, D, decreases with increase in Al-content. The lattice parameter, a Cobalt ferrite based Up to now, ferritic steels have not been considered for these components, mainly due to their relatively low creep properties. Some ferritic steels are usable when the maximum temperatures in service do not exceed about 0 C.

These ferritic alloys have worked successfully since the first steam production in October For the SuperPhenix power plant, an ''all austenitic stainless alloy'' apparatus has been chosen. Most of these steels have already an industrial background, and are widely used in similar applications. Most irradiation studies have been carried out in fast reactors, where little transmutation helium forms. Helium has been shown to enhance swelling and affect tensile and fracture behavior, making helium a critical issue, since high helium concentrations will be generated in conjunction with displacement damage in a fusion reactor.

Ferrite LTCC based phased array antennas. Two phased array antennas realized in multilayer ferrite LTCC technology are presented in this paper. The use of embedded bias windings in these designs allows the negation of external magnets which are conventionally employed with bulk ferrite medium. The phase shifters are implemented using the SIW technology. One of the designs is operated in the half mode waveguide topology while the other design is based on standard full mode waveguide operation.

The two phase shifter designs are integrated with two element patch antenna array and slotted SIW array respectively. The designs, due to their small factor can be easily integrated in modern communication systems which is not possible in the case of bulk ferrite based designs. Recrystallization induced plasticity in austenite and ferrite.

Such Recrystallization Induced Plasticity RIP phenomenon occurs because the overall atomic flux during recrystallization follows a preferential direction imposed by the applied stress. Cation distributions on rapidly solidified cobalt ferrite. The cation distributions in two rapidly solidified cobalt ferrites have been determined using Moessbauer spectroscopy at 4.

The degree of cation disorder in both cases was greater than is obtainable by cooling unmelted cobalt ferrite. The more rapidly cooled sample exhibited a smaller departure from the equilibrium cation distribution than did the more slowly cooled sample. This result is explained on the basis of two competing effects of rapid solidification: high cooling rate of the solid, and large undercooling.

Simulation of non-linear coaxial line using ferrite beads. We have been examining the characteristics of ferrite sharpeners experimentally, varying various parameters. Also we have made the simulation of the ferrite sharpener and compared the predictions with the experimental results in detail to analyze the characteristics of the sharpener. In this report, calculating the magnetization M of the ferrite bead, we divide the bead into n sections radially instead of adopting M at the average radius in the previous report.

Magnetic properties of nanostructured spinel ferrites and By using a copper wheel, rotating with the Zn ferrite with a small applied field of 4 mT for two different grain sizes. By varying the concentration of the oxidant KNO3 or ferric ions, we could achieve.

Synthesis and Characterization of Cobalt Ferrite Nanoparticles It was observed that surface modification such as with silica coating on the cobalt ferrite will have significant effect on the structural and magnetic properties. It is also observed that, silica coated nanoparticles could be used in biomedical applications Hong et al. In this work we have chosen sol-gel Structural properties of Cd—Co ferrites.

Neutron diffraction in a frustrated ferrite. The competition between a long range ordered ferrimagnetic lattice and small fluctuating clusters have been probed by neutron diffraction in a titanium magnesium frustrated ferrite. The description of the system is then compared to the predictions of several theoretical models for frustrated systems.

Modeling of austenite to ferrite transformation. MS received 17 January ; revised 9 July In this research, an algorithm Synthesis of lithium ferrites from polymetallic carboxylates. Full Text Available Lithium ferrite was prepared by the thermal decomposition of three polynuclear complex compounds containing as ligands the anions of malic, tartaric and gluconic acid: NH42[Fe2.

The polynuclear complex precursors were characterized by chemical analysis, IR and UV—Vis spectra, magnetic measurements and thermal analysis. The obtained lithium ferrites were characterized by XRD, scanning electron microscopy, IR spectra and magnetic measurements. The particle size was smaller than nm. Synthesis and characterization of nanocrystalline zinc ferrite.

Nanocrystalline zinc ferrite powders with a partially inverted spinel structure were synthesized by high-energy ball milling in a closed container at ambient temperature from a mixture of alpha-Fe2O3 and ZnO crystalline powders in equimolar ratio. From low-temperature and in-field Mossbauer Effect of alloying element partitioning on ferrite hardening in a low alloy ferrite -martensite dual phase steel.

In this paper, the effect of carbon and other alloying elements partitioning on ferrite hardening behavior were studied in details using a low alloy AISI ferrite -martensite dual phase DP steel. Light and electron microscopic observations were supplemented with electron dispersive spectroscopy EDS and nanoindentation tests to explore the localized compositional and hardening variations within ferrite grains in DP samples.

The experimental results showed that the ferrite hardness was varied with progress of austenite to ferrite phase transformation in DP samples. The reduction of potential energy developed by attractive interaction between C-Cr and C-Mo couples toward the carbon enriched prior austenite areas were the dominating driving force for pile-up segregation. High-Q perpendicular-biased ferrite -tuned cavity.

The traditional approach to ferrite -tuned cavities uses a ferrite which is longitudinally biased rf magnetic field parallel to bias field. This method leads to unacceptably high losses in the ferrite. At Los Alamos, we are developing a cavity with transverse bias rf magnetic field perpendicular to the bias field that makes use of the tensor permeability of the ferrite. Modest power tests of a small cm-dia quarter-wave singly re-entrant cavity tuned by nickel-zinc ferrites and aluminum-doped garnets indicate that the losses in the ferrite can be made negligible compared with the losses due to the surface resistivity of the copper cavity at power levels from 2 to watts.

Enhancement of electrical conductivity in gamma irradiated cobalt ferrite nanoparticles. The cobalt ferrite nanoparticles were synthesized by sol-gel auto- combustion method, in which L-ascorbic acid was used as a fuel. The effect of gamma irradiation on the electrical resistivity of cobalt ferrite nanoparticles has been studied. The synthesized nanoparticles were characterized by X-ray diffraction and DC resistivity.

Plasma spot welding of ferritic stainless steels. Plasma spot wedding of ferritic stainless steels studied. The study was focused on welding parameters, plasma and shieldings and the optimum welding equipment. Plasma-spot welded overlap joints on a 0. Several macro specimens were prepared Plasma spot welding is suitable to use the same gas as shielding gas and as plasma gas , i. Tension-shear strength of plasma-spot welded joint was compared to that of resistance sport welded joints.

It was found that the resistance welded joints withstand a somewhat stronger load than the plasma welded joints due to a large weld sport diameter of the former. Strength of both types of welded joints is approximately the same. Author 32 refs. Microwave firing of MnZn- ferrites. Microwave firing is evaluated in comparison to conventional firing for MnZn- ferrites. For otherwise identical conditions, microwave firing results to higher densities and coarser microstructures. Initial magnetic permeability values 25 kHz, 25 deg.

C, ferrite firing technology for materials to be used in high magnetic permeability applications. No advantages of microwave firing are evident for materials intended to be used in high field power applications. Cytotoxicity of ferrite particles by MTT and agar diffusion methods for hyperthermic application.

Their cytotoxicity was compared with that of alginate-encapsulated ferrites. Alginate-encapsulated Ba- ferrite was ranked mildly cytotoxic, whereas their ferrite particles were ranked cytotoxic. Titanium oxide dispersion-strengthened ferritic alloys. Their main use is for the fabrication of fast breeder reactor cladding tubes but their application as turbine blade material is also envisaged for cases where high damping is important.

Magnetocapacitance effects in MnZn ferrites. Full Text Available The magnetocapacitance effects of MnZn ferrites with different initial permeabilities have been studied systematically. Both intrinsic effect associated with magnetoelectric coupling and extrinsic effect, which means the combined contribution of magnetoresistance and the Maxwell-Wagner effect, have been observed simultaneously. Analysis shows that the relationship between the origins of both is in competitive equilibrium.

Either of both mechanisms plays a dominant role in magnetocapacitance effects under different conditions, respectively, such as permeability and frequency of applied signals. In this paper, we accurately and carefully characterize a ferrite -core probe that is widely used for aircraft inspections.

The characterization starts with the development of a model that can be executed using the proprietary volume-integral code, VIC-3D c , and then the model is fitted to measured multifrequency impedance data taken with the probe in freespace and over samples of a titanium alloy and aluminum. Excellent results are achieved, and will be discussed. Ferritic stainless steels provide corrosion resistance at lower cost.

Their corrosion and mechanical properties are examined. Resistance to stress-corrosion cracking is an advantage compared to austenitic types. Removal of radioactive materials from waste solutions via magnetic ferrites. Ferrite waste treatment was found to be effective in removing actinides from simulated Rocky Flats process waste solutions. In addition, siginficantly less solid was produced as compared with the flocculant precipitation technique now employed at Rocky Flats.

Aging of ferrite solids and elevated beryllium and phosphate concentrations were identified as interferences in the ferrite treatment of process waste, but neither appeeared serious enough to prevent implementation in plant operations. National Aeronautics and Space Administration — Ferrite based isolators and circulators have been successfully demonstrated at microwave, millimeter-wave and submillimeter-wave frequencies.

These components are Preparation of single-crystal copper ferrite nanorods and nanodisks. This article, for the first time, reports the preparation of single-crystal copper ferrite nanorods and nanodisks. Using amorphous copper ferrite nanoparticles synthesized by reverse micelle as reaction precursor, single-crystal copper ferrite nanorods were synthesized via hydrothermal method in the presence of surfactant polyethylene glycol PEG , however, copper ferrite nanodisks were prepared through the same procedures except the surfactant PEG.

The bulk composition of the samples was determined by means of X-ray photoelectron spectroscopy XPS. Surface effects on the magnetic behavior of nanocrystalline nickel ferrites and nickel ferrite -polymer nanocomposites.

The magnetization studies on nanocrystalline nickel ferrite as powder particles, and as diluted dispersion 10 wt. The two polymer-based nanocomposites were prepared via ball-milling and in situ polymerization, respectively. The magnetization measurements provide strong evidence of surface effects to magnetization, which explains the non-saturation of magnetization at high fields.

The differences in the magnetization behavior of nickel ferrite as powder particles and in the ball-milled nanocomposite and the nanocomposite prepared via in situ polymerization are attributed to the different extent of interparticle interactions between the particles and the preparation route. The magnetization versus applied field behavior of the three ferrite systems show a similar jump in the initial part of the magnetization curve in all the cases which implies the existence of a core-shell like morphology of the particles over a large temperature range and its dominance over the interparticle interaction effects between the particles.

Contribution to the structural study of austeno- ferritic steels. Morphological and analytical definition of the ferritic phase. Conditions of fast and selective austenite dissolution were defined by means of current-voltage curves using AISI type materials welding beads. The ferritic phase was isolated and identified with X-rays. The percentages of ferrite were compared gravimetrically with those obtained by traditional methods.

The ferrite isolated was chemically analysed by atomic absorption, the only doubtful value being carbon. Calcium ferrite formation from the thermolysis of calcium tris maleato. Viswanathan and Murthy , ferrites have opened a new vista in the field of chemical physics of materials. Keeping in view these technological applications, ferrites have been regarded as an important Anantharaman, M. However, there have been recent reports suggesting that zinc ferrite exhibits anomaly in its magnetisation.

A seeded ambient temperature ferrite process for treatment of AMD A seeded ambient temperature ferrite process for treatment of AMD waters: magnetite formation in the presence and absence of calcium ions under steady state operation.

The price fluctuations of rare earth metals and the uncertainty in their availability has generated an increased interest in ferrite magnet machines. The influence of temperature on BH characteristics of the ferrite magnet differ considerably from that of the rare earth magnet and hence, requires Recent advances in processing and applications of microwave ferrites.

Harris, Vincent G. Next generation magnetic microwave devices will be planar, smaller, weigh less, and perform well beyond the present state-of-the-art. For this to become a reality advances in ferrite materials must first be realized.

These advances include self-bias magnetization, tunability of the magnetic anisotropy, low microwave loss, and volumetric and weight reduction. To achieve these goals one must turn to novel materials processing methods. Here, we review recent advances in the processing of microwave ferrites. Attention is paid to the processing of ferrite films by pulsed laser deposition, liquid phase epitaxy, spin spray ferrite plating, screen printing, and compaction of quasi-single crystals.

Conventional and novel applications of ferrite materials, including microwave non-reciprocal passive devices, microwave signal processing, negative index metamaterial-based electronics, and electromagnetic interference suppression are discussed. The effect of cooling rate and austenite grain size on the austenite to ferrite transformation temperature and different ferrite morphologies in microalloyed steels.

The effect of different austenite grain size and different cooling rates on the austenite to ferrite transformation temperature and different ferrite morphologies in one Nb-microalloyed high strength low alloy steel has been investigated. Three different austenite grain sizes were selected and cooled at two different cooling rates for obtaining austenite to ferrite transformation temperature. Moreover, samples with specific austenite grain size have been quenched, partially, for investigation on the microstructural evolution.

In order to assess the influence of austenite grain size on the ferrite transformation temperature, a temperature differences method is established and found to be a good way for detection of austenite to ferrite , pearlite and sometimes other ferrite morphologies transformation temperatures. The results obtained in this way show that increasing of austenite grain size and cooling rate has a significant influence on decreasing of the ferrite transformation temperature.

Micrographs of different ferrite morphologies show that at high temperatures, where diffusion rates are higher, grain boundary ferrite nucleates. As the temperature is lowered and the driving force for ferrite formation increases, intragranular sites inside the austenite grains become operative as nucleation sites and suppress the grain boundary ferrite growth. The results indicate that increasing the austenite grain size increases the rate and volume fraction of intragranular ferrite in two different cooling rates.

Moreover, by increasing of cooling rate, the austenite to ferrite transformation temperature decreases and volume fraction of intragranular ferrite increases. Cobalt ferrite nanoparticles under high pressure. Saccone, F. In addition, we report the pressure dependence of the unit-cell parameter and Raman modes of the studied sample.

After decompression, the cobalt ferrite lattice parameter does not revert to its initial value, evidencing a unit cell contraction after pressure was removed. Finally, Raman spectroscopy provides information on the pressure dependence of all Raman-active modes and evidences that cation inversion is enhanced by pressure under non-hydrostatic conditions, being this effect not fully reversible. Magnetic behavior of nanocrystalline nickel ferrite. In the previous papers [R. Misra, A. Kale, R. Srivatsava, O.

Senkov, Mater. Kale, B. Hooi, J. DeHosson, Mater. Kale, S. Gubbala, R. Misra, J. Gubbala, H. Nathani, K. Koizol, R. Misra, Phys. B ; R. Misra, S. Gubbala, A. Kale, W. Egelhoff, Mater. In the present paper, the reverse micelle approach has been extended to synthesize nanocrystalline ferrites with varying surface roughness of A the surface roughness was measured by atomic force microscopy and the magnetic behavior studied by SQUID magnetometer.

Two different kinds of measurement were performed: a zero-field cooling ZFC and field cooling FC magnetization versus temperature measurements and b magnetization as a function of applied field. The analysis of magnetic measurement suggests significant influence of surface roughness of particles on the magnetic behavior. While the superparamagnetic behavior is retained by the nanocrystalline ferrites of different surface roughness at K, the hysteresis loop at 2 K becomes non-squared and the coercivity increases with increase in surface roughness.

This behavior is discussed in terms of broken bonds and degree of surface spin disorder. Preferential spin canting in nanosize zinc ferrite. Pandey, Brajesh, E-mail: bpandey gmail. Xavier Sigaud , Rio de Janeiro Brazil. Zinc ferrite nanoparticles powder with average size of X-ray diffraction patterns show that the synthesized zinc ferrite possesses good spinel structure.

Deviations from the antiferromagnetic arrangement of B-site spins are supposed to be caused by magnetic frustration effects. Assessment of the integrity of ferritic -austenitic dissimilar weld joints of different grades of Cr-Mo ferritic steels.

Laha, K. Metallurgy and Materials Group. Integrity of the 2. The dissimilar weld joints displayed lower creep rupture strength than their respective ferritic steel base metals. The strength reduction was more for 2. The failure location in the joints was found to shift from the ferritic steel base metal to the intercritical region of heat-affected zone HAZ in ferritic steel type IV cracking with decrease in stress. Note from indexer: paper contains many typographical errors.

Effect of ferrite addition above the base ferrite on the coupling factor of wireless power transfer for vehicle applications. Effect of adding extra ferrite above the base ferrite at different physical locations on the self-inductance, mutual inductance and coupling factor is under investigation in this paper. The addition can increase or decrease the mutual inductance depending Ruud, Clayton O.

This document summarizes the results of research conducted at Pacific Northwest National Laboratory PNNL to determine whether, based on experimental measurements, a correlation existed between grain structure in cast austenitic stainless steel CASS piping and ferrite content of the casting alloy. The motivation for this research lies in the fact that ultrasonic testing UT is strongly influenced by CASS grain structure; knowledge of this grain structure may help improve the ability to interpret UT responses, thereby improving the overall reliability of UT inspections of CASS components.

Advances in ferrite microwave materials and devices. The application of ferrites in non-reciprocal components is discussed, with the emphasis on broadband isolators and circulators. For the best currently available devices this ratio is approx. Plasticity of oxide dispersion strengthened ferritic alloys. Their tensile properties have been tested from 20 to C.

These alloys are high tensile and creep resistant between and C. Their strongly stress-sensitive creep behaviour can be described by usual creep laws and incorporating a threshold stress below which the creep rate is negligible. Beam impedance of ferrite kicker magnets. We have measured the longitudinal beam impedance of a typical pulsed magnet that will be used in the Advanced Light Source.

The magnets are of a ferrite window-frame design with a single plate conductor on each side. Two separate power supplies are used to drive current in opposite directions in the two conductors. The continuity of the ferrite yoke is interrupted by two copper plates 1 mm thick in the center of the top and bottom of the window frame. This increases the reluctance of the magnetic path, and thus decreases the flux which couples the beam.

This makes a ohm transmission line, and it was terminated in a resistive divider at the exit end. A 3 GHz network analyzer was used to measure S 21 through the magnet, and longitudinal beam impedance was calculated from this data. The impedance is dominated by two low frequency resonances in the magnet winding and drive current. Dissolution studies on Nickel ferrite in dilute chemical decontamination formulations.

Ranganathan, S. Department of Chemistry. Nickel ferrite is one of the important corrosion products in the pipeline surfaces of water-cooled nuclear reactors. The dissolution of the nickel ferrite by chelating agents is very sensitive to the nature of the chelant, the nature of the reductant used in the formulation and the temperature at which the dissolution studies are performed.

The dissolution is mainly controlled by the reductive dissolution of the ferrite particles, but complexing agents also play a significant role in the dissolution process. This study deals with the leaching of iron and nickel from nickel ferrite prepared by the solid-state method.

The addition of Fe II -L in the formulation greatly enhances the dissolution of nickel ferrite. The preferential leaching of nickel over iron during the dissolution of nickel ferrite was observed in all the formulations. Manufacturing of Mn-Zn ferrite transformer cores. The present work is related to the development of soft ferrite transformer cores, which are extensively used in electronic devices such as switch mode power supplies, electromagnetic devices, computers, amplifiers etc.

Mn-Zn Ferrite soft ferrite powders were prepared by conventional mixed oxide and auto combustion routes. These powders were calcined and then pressed in toroid shapes. Sintering was done at different temperatures to develop desired magnetic phase. Impedance resistance of sintered toroid cores was measured at different frequencies. Results revealed that Mn-Zn Ferrite cores synthesized by auto combustion route worked more efficiently in a high frequency range i.

It was noticed that compact size, light weight and high impedance resistance are the prime advantages of auto combustion process which supported the performance of core in MHz frequency range. Furthermore, these compact size cores were successfully tested in linear pulse amplifier circuit of Pakistan Atomic Research Reactor-I.

The fabrication of soft ferrite Mn-Zn Ferrite cores by different processing routes is an encouraging step towards indigenization of ferrite technology. Ferrite materials have long played an important role in power conditioning, conversion, and generation across a wide spectrum of frequencies up to ten decades. They remain the preferred magnetic materials, having suitably low losses, for most applications above 1 MHz, and are the only viable materials for nonreciprocal magnetic microwave and millimeter-wave devices including tunable filters, isolators, phase shifters, and circulators.

Recently, novel processing techniques have led to a resurgence of research interest in the design and processing of ferrite materials as nanoparticles, films, single crystals, and metamaterials. These latest developments have set the stage for their use in emerging technologies that include cancer remediation therapies such as magnetohyperthermia, magnetic targeted drug delivery, and magneto-rheological fluids, as well as enhanced magnetic resonance imaging.

With reduced dimensionality of nanoparticles and films, and the inherent nonequilibrium nature of many processing schemes, changes in local chemistry and structure have profound effects on the functional properties and performance of ferrites. In this lecture, we will explore these effects upon the fundamental magnetic and electronic properties of ferrites. Density functional theory will be applied to predict the properties of these ferrites , with synchrotron radiation techniques used to elucidate the chemical and structural short-range order.

This approach will be extended to study the atomic design of ferrites by alternating target laser-ablation deposition. Recently, this approach has been shown to produce ferrites that offer attractive properties not found in conventionally grown ferrites. We will explore the latest research developments involving ferrites as related to microwave and millimeter-wave applications and the attempt to integrate these materials with semiconductor materials platforms.

RF electromagnetic wave absorbing properties of ferrite polymer composite materials. The complex permeability of the composites was found to increase as the ferrite content increased, and was characterized by frequency dispersion localized above 50MHz. The variation of return loss RL of single-layer RF absorbers using the prepared composite materials has been investigated as a function of frequency, ferrite content and the thickness of the absorbers.

Fast ferrite tuner for the BNL synchrotron light source. A new type of ferrite tuner has been tested at the BNL. The ferrite tuner uses garnet slabs partially filling a stripline. One of the important features of the tuner is that the ferrite is perpendicularly biased for operation above FMR, thus reducing the magnetic losses.

A unique design was adopted to achieve the efficient cooling. The principle of operation of the tuner as well as our preliminary results on tuning a 52 MHz cavity are reported. Optimized conditions under which we demonstrated linear tunability of 80 KHz are described. The tuner's losses and its effect on higher-order modes in the cavity are discussed. The mechanism of nickel ferrite formation by glow discharge effect.

The influence of various factors on the formation of nickel ferrite by the glow discharge effect has been studied. The ferritization process in the system FeSO4-NiSO4-NaOH-H2O has been studied by the methods of potentiometric titration, measurement of electrical conductivity, residual concentrations and apparent sediment volume. It has been established that the process proceeds in a multistage fashion at pH with the formation of polyhydroxo complexes, an intermediate compound and the ferrite formation by its oxidation with active radicals.

Moessbauer spectroscopic characterization of ferrite ceramics. The principle of Moessbauer effect and the nature of hyperfine interactions were presented. The discovery of the Moessbauer effect was the basis of a new spectroscopic technique, called Moessbauer spectroscopy, which has already made important contribution to research in physics, chemistry, metallurgy, mineralogy and biochemistry.

In the present work the selected ferrites such as spinel ferrite , NiFe 2 O 4 , and some rare earth orthoferrites and garnets were investigated using Moessbauer spectroscopy. X-ray powder diffraction and Fourier transform infrared spectroscopy were used as complementary techniques. C and after heating at deg. C the stoichiometric NiFe 2 O 4 was produced.

The effect of ball-milling of NiFe 2 O 4 was monitored. Similar behavior was observed during the formation of Er 3 Fe 5 O Creep lifetime assessements of ferritic pipeline welds. The low alloy ferritic steam pipework in Advanced Gas Cooled reactor AGR power stations operates at temperatures in the creep range. An inspection strategy for continued operation of the pipework has been developed based on estimation of the creep rupture life of pipework weldments and fracture mechanics for demonstrating acceptance of defects.

This strategy is described in outline. The estimation of creep rupture life is described in more detail. Validation for the approach is illustrated by comparison with pressure vessel tests and with metallographic examination of components removed from service. The fracture mechanics methods are also described. It is shown that the amount of creep crack growth is dependent on the life fraction at which the assessment is made; crack growth being rapid as the creep rupture life is approached.

New ferritic steels for advanced steam plants. These new steels are already being applied in 13 European and 34 Japanese power stations with inlet steam temperature up to deg C. This presentation will give an account of the content, scope and results of the research programmes and of the experience gained during the production of components which have been manufactured from the new steels.

Positron annihilation characterization of nanostructured ferritic alloys. Some annihilations may also occur in small cavities. In Y-free control alloys, that do not contain NFs, positrons primarily annihilate in the Fe-Cr matrix and at features such as dislocations, while a small fraction annihilate in large cavities or Ar bubbles. Tuning the magnetism of ferrite nanoparticles. The importance of magnetic interactions within an individual nanoparticle or between adjacent ones is crucial not only for the macroscopic collective magnetic behavior but for the AC magnetic heating efficiency as well.

The role of cobalt ferrite magnetic nanoparticles in medical science. The nanotechnology industry is rapidly growing and promises that the substantial changes that will have significant economic and scientific impacts be applicable to a wide range of areas, such as aerospace engineering, nano-electronics, environmental remediation and medical healthcare.

In this area, cobalt ferrite nanoparticles have been regarded as one of the competitive candidates because of their suitable physical, chemical and magnetic properties like the high anisotropy constant, high coercivity and high Curie temperature, moderate saturation magnetization and ease of synthesis.

This paper introduces the magnetic properties, synthesis methods and some medical applications, including the hyperthermia, magnetic resonance imaging MRI , magnetic separation and drug delivery of cobalt ferrite nanoparticles. Behavior of ferritic steels irradiated by fast neutrons. Ferritic steels were irradiated in Rapsodie and Phenix at varying doses. The swelling and irradiation creep characteristics are reported below as are the mechanical characteristics of these materials [fr.

The behaviour of ferritic steels under fast neutron irradiation. Ferritic steels have been irradiated in Rapsodie and Phenix to doses up to dpa F. The swelling and irradiation creep characteristics and the mechanical properties of these materials are reported. Antiresonance in Ni,Zn ferrite -carbon nanofibres nanocomposites. Fernandez-Garcia, L. Low-activation ferritic steels are leading material candidates for use in next-generation fusion development experiments such as a prospective US component test facility and DEMO.

Understanding the interaction of plasmas with a ferromagnetic wall will provide crucial physics for these experiments. Using its high-resolution magnetic diagnostics and positionable walls, HBT-EP has begun exploring the dynamics and stability of plasma interacting with high-permeability ferritic materials tiled to reduce eddy currents. We summarize a simple model for plasma-wall interaction in the presence of ferromagnetic material, describe the design of a recently-installed set of ferritic shell segments, and report initial results.

Supported by U. Ferrite bead effect on Class-D amplifier audio quality. International audience; This paper studies the effect of ferrite beads on the audio quality of Class-D audio amplifiers. This latter is a switch-ing circuit which creates high frequency harmonics. Generally, a filter is used at the amplifier output for the sake of electro-magnetic compatibility EMC.

So often, in integrated solutions, this filter contains ferrite beads which are magnetic components and present nonlinear behavior. Time domain measurements and their equivalence in frequency do The future thermal power plant is expected to operate at higher temperature to improve its efficiency and to reduce greenhouse gas emission.

This target requires better corrosion properties of ferritic steels, which commonly used as materials for superheater and reheater of boiler tubes. In this work, chromium enrichment on the surface of ferritic steel is studied. The deposited chromium is expected to become a reservoir for the formation of chromia protective layer. Chromium was deposited on Initial commissioning of the injector revealed a rise time excited 7.

Commissioning also revealed that the use of the crowbar to decrease the voltage fall time excited a spectrum of radio frequency modes which caused concern that there might be significant transient RF electric field stresses imposed on the high voltage column insulators. Based on the experience of damping the induction cell RF modes with ferrite , the concept of a ferrite damper was developed to address the crowbar-excited oscillations as well as the rise-time-excited 7.

After the Project decided to discontinue the use of the crowbar, further development of the concept focused exclusively on damping the oscillations excited by the rise time. The organization of this report is as follows. The suite of injector diagnostics are described in Section 2. The data and modeling of the injector transients excited on the rise-time and also by the crowbar are discussed in Section 3; the objective is a concise summary of the present state of understanding.

The design of the ferrite damper, and the small scale circuit simulations used to evaluate the ferrite material options and select the key design parameters like the cross sectional area and the optimum gap width, are presented in Section 4. The details of the mechanical design and the installation of the ferrite damper are covered in Section 5. A brief summary of the performance of the ferrite damper following its installation in the injector is presented in Section 6.

Spin canting phenomenon in cadmium doped cobalt ferrites Aug 26, It has been recognized for some time that the very high fluence of fast The best-understood and most promising solutions presently available are a family of low-activation steels originally developed for use in fission reactors, but the ferromagnetic properties of these steels represent a danger to plasma confinement through enhancement of magnetohydrodynamic instabilities and increased susceptibility to error fields.

At present, experimental research into the effects of ferromagnetic materials on MHD stability in toroidal geometry has been confined to demonstrating that it is still possible to operate an advanced tokamak in the presence of ferromagnetic components.

In order to better quantify the effects of ferromagnetic materials on tokamak plasma stability, a new ferritic wall has been installated in the High Beta TokamakExtended Pulse HBT-EP device. The development, assembly, installation, and testing of this wall as a modular upgrade is described, and the effect of the wall on machine performance is characterized.

Comparative studies of plasma dynamics with the ferritic wall close-fitting against similar plasmas with the ferritic wall retracted demonstrate substantial effects on plasma stability. Susceptibility of plasmas to disruption events increases by a factor of 2 or more with the ferritic wall inserted, as disruptions are observed earlier with greater frequency.

Growth rates of external kink instabilities are observed to be twice as large in the presence of a close-fitting ferritic wall. Initial studies are made of the influence of mode rotation frequency. Intragranular ferrite morphologies in medium carbon vanadium-microalloyed steel. Full Text Available The aim of this work was to determine TTT diagram of medium carbon V-N micro-alloyed steel with emphasis on the development of intragranular ferrite morphologies.

These treatments were interrupted at different times in order to analyze the evolution of the microstructure. Metallographic evaluation was done using optical and scanning electron microscopy SEM. In addition to sheaf type acicular ferrite , the grain boundary nucleated bainitic sheaves are observed. Structural investigation of chemically synthesized ferrite magnetic nanomaterials. Uyanga, E. In recent times, interest in ferrite magnetic nanomaterials has considerably grown, mainly due to their highly promising medical and biological applications.

Spinel ferrite powder samples, with high heat generation abilities in AC magnetic fields, were studied for their application to the hyperthermia treatment of cancer tumors. These properties of ferrites strongly depend on their chemical composition, ion distribution between crystallographic positions, magnetic structure and method of preparation.

In this study, crystal and magnetic structures of several magnetic spinels were investigated by neutron diffraction. The explanation of the mechanism triggering the heat generation ability in the magnetic materials, and the electronic and magnetic states of ferrite -spinel type structures, were theoretically defined by a first-principles method.

Ferrites with the composition of CuxMg1-xFe2O4 have been investigated as a heat generating magnetic nanomaterial. Kharat, Prashant B. The XRD results confirmed the formation of single phase spinel structure. The Raman spectra have been deconvoluted into individual Lorentzian peaks. Cobalt ferrite has cubic spinel structure with Fd3m space group. These absorption bands confirm the formation of spinel-structured cobalt ferrite.

Brookfield DV-III viscometer and programmable temperature-controlled bath was used to study the relationship between viscosity and temperature. The viscosity of the present ferrofluid was found to decrease with increase in temperature.

Specific heat of nano- ferrites modified composites. Initially, nano- ferrites were introduced in epoxy systems in order to improve the electromagnetic properties of formed materials. Together with the changes in electromagnetic properties some modifications occur regarding thermal and mechanical properties.

The materials were formed by placing 5g or 10g of ferrite into g polymer matrix leading to a very low weight ratio of modifying agent. At so low ratios the effect of ferrite presence should be insignificant according to mixing rule. Anyway there is possible to appear some chelation reaction with effects on thermal properties of materials. Three types of epoxy resins had been used as matrix and barium ferrite and strontium ferrite as modifying agents. The thermal analysis was developed on two heatingcooling cycles and the specific heat was evaluated for each segment of the cycle analysis.

E-mail: leeyk yumc. Experimental ME coefficients and voltages were compared to analytical calculations using a quasi-static model. Theoretical demagnetizing factors of two magnetic discs that interact together in parallel magnetic structures were derived from an analytical calculation based on a superposition method. These factors were introduced in ME voltage calculations which take account of the demagnetizing effect.

To fit the experimental results, a mechanical coupling factor was also introduced in the theoretical formula. This reflects the differential strain that exists in the ferrite and PZT layers due to shear effects near the edge of the ME samples and within the bonding epoxy layers. From this study, an optimization in magnitude of the ME voltage is obtained.

The advantage of such a structure is then discussed. Full Text Available Plasma spot welding of ferritic stainless steels is studied. The study was focused on welding parameters, plasma and shielding gases and the optimum welding equipment. Several macro specimens were prepared. Plasma spot welding is suitable to use the same gas as shielding gas and as plasma gas, i. Tension-shear strength of plasma-spot welded joints was compared to that of resistance-spot welded joints.

It was found that the resistance welded joints withstand a somewhat stronger load than the plasma welded joints due to a larger weld spot diameter of the former. Se realizaron macro pulidos. Water corrosion resistance of ODS ferritic -martensitic steel tubes.

Oxide dispersion strengthened ODS ferritic -martensitic steels have superior radiation resistance; it is possible to achieve a service temperature of up to around K because of their superior creep strength. These advantages of ODS steels facilities their application to long-life cladding tubes in advanced fast reactor fuel elements. In addition to neutron radiation resistance, sufficient general corrosion resistance to maintain the strength of the cladding, and the stress corrosion cracking SCC resistance for spent-fuel-pool cooling systems and high-temperature oxidation for the fuel-clad chemical interaction FCCI of ODS ferritic steel are required.

In a previous paper, it has been demonstrated that the resistances of 9Cr- and 12Cr-ODS ferritic -martensitic steels for high-temperature oxidation are superior to those of conventional 12Cr ferritic steel. However, the water corrosion data of ODS ferritic -martensitic steels are very limited. In this study, a water corrosion test was conducted on ODS steels in consideration of the spent-fuel-pool cooling condition, and the results were compared with those of conventional austenitic stainless steel and ferritic -martensitic stainless steel.

A theoretical model to predict the phase shift in the partially magnetized state has been derived. Contrary to the bulky external magnets employed by conventional ferrite.

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