Materials Literature
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Physicochemical interactions in the GaS-GaSe-GaTe system were studied by differential thermal analysis, X-ray powder diffraction, and microhardness measurements. Phase diagrams for the GaTe-GaS 0.75 Se 0.25 non-quasi-binary polytherm and the GaS-GaSe 0.5 Te 0.5 quasi-binary polytherm are given. The GaS-GaSe-GaTe syste…
Chiral aromatic liquid crystal (LC) polyesters were prepared by incorporating ( R )-(+)-1-(1-naphthyl)ethylamine (NEA) to both their ends, and the helical twisting powers were determined for the cholesteric LCs in mixtures with the homologous nematic polymer. The chiral NEA groups in the polymer ends were found to act…
Joint reduction of iron group metals in aqueous solutions on a dispersed aluminum matrix was studied. The powders obtained were examined by X-ray phase analysis and electron scanning microscopy.
The piezoelectric properties of Pb[(Fe1/3Sb2/3) x Ti y Zr z ]O3 with x + y + z = 1, x = 0.1, y = 0.43–0.48 ceramics have been investigated over a broad temperature range using a resonance technique. The influence of modification of PZT normal ferroelectric synthesized near the morphotropic phase boundary by a relaxor…
Three components of a concept robotic fueling system for automatic refueling of vehicles for commercial use were designed and tested. The components of interest were the control system (user interface and logic), vehicle positioning system (sensor system), and the automatic controlled dispensing of fuel (fuel nozzle).…
INTRODUCTION: Leather tanning may result in various occupational diseases. The aim of this study was to compare the relation between blood pressure levels and vocations in leather tanning. METHODS: Our study was conducted in Turkey's leading leather process plant located in Tuzla organised industry zone, between March…
We investigated the reading and writing of ferroelectric-gate field-effect transistor memory with an intermediate electrode (IF-FET) to achieve perfect nondestructive readouts. In the previous operation method, although the difference in output voltage DeltaVObetween positive (Pr+) and negative (Pr-) remanent polariza…
Electromagnetic actuators have some problems such as heat generation and bulky size. To overcome such problems, this paper proposes an electromagnetic actuator using inverse magnetostrictive effect. The development of inverse magnetostrictive actuator (IMA) starts with the concept of magnetostrictive material (MM) as…
Nitrogen-doped SrTiO 3 samples have been successfully prepared by nitrogen-ion implantation. X-ray photoelectron spectra clearly indicate the presence of nitrogen dopants in the crystal lattice of SrTiO 3 . The ultraviolet–visible absorption spectra of nitrogen-doped SrTiO 3 show enhanced visible light absorption in t…
Abstract Fibre reinforced ceramic components are most efficiently produced by the braiding technique. Since the braiding angle can be adjusted during the preform fabrication process in a wide range as required by the loading situation of the composite, the evaluation and prediction of the elastic properties as a funct…
In Southern Africa, the medicinal plant Warburgia salutaris is commonly used for the treatment of inflammatory and other diseases. The methanol extracts of W. salutaris were investigated with regard to a) production of proinflammatory cytokines tumor necrosis factor-alpha, interleukin-1beta, and interferon-gamma; b) a…
High frequency ultrasonic transducers were fabricated using lead indium niobate-lead magnesium niobate-lead titanate (0.24PIN-0.44PMN-0.32PT) as the active piezoelectric material. The measured center frequency and bandwidth of the device were 35 MHz and 48 % respectively. The electrical impedance magnitude was 71 Omeg…
In this paper the current transport mechanism of ZnO-based metal-semiconductor-metal ultraviolet photodetectors with various contact electrodes is discussed and simulated. The simulation is based on the thermionic emission theory and tunneling effects. It was found that the lowest dark current attributes to the Ru con…
In this paper, we have developed the flexible polyimide based magnetostrictive multibody actuators and investigated the magneto-mechanical characteristics of TbFe/Ni/TbFe layered thin film sputtered on the polyimide substrate with different thickness ratios for micro devices. The developed actuator is operated by magn…
Magnetoresistance of cobalt-doped zinc oxide and cuprous oxide ferromagnetic nanoparticles with different cobalt concentrations are studied. Zeeman splitting effect is found to play a key role in the electrical transport of our cobalt-doped oxide ferromagnetic nanoparticles. We emphasize that the existence of large Ze…
In an attempt to develop anisotropic high-temperature permanent magnets consisting of Sm2(Co,Fe)17grains separated by thin layers of a nonmagnetic phase, small amounts of Ag, C, Ga, In, and Sn were added to the Sm2Co17-based alloys and sintered magnets. Grain-boundary phase(s) with the melting temperature of 985-1070d…
NaFeGe 2 O 6 polycrystals were synthesized and their x-ray diffraction, magnetic, electrical, and Mössbauer characteristics were measured. It is established that this monoclinic compound is a dielectric with a temperature of antiferromagnetic ordering of 15 K. The Mössbauer spectrum at 300 K is a quadrupole doublet. T…
In this study the magnetic properties and the structure of Gd5Ge1.8Si1.8Sn0.4alloy were investigated by powder X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), and magnetometry. The concentration of the Sn-doping in this study is four times that used in previous studie…
A technique employing electron beams generated by an open gas discharge is proposed for measuring the light efficiency of phosphor coatings of cathodoluminescent screens. The total light efficiencies of various phosphor coatings in the medium excitation energy range (ɛ < 7 keV) are estimated with allowance for both th…
The possibility of developing a model based on the concept of magnetic viscosity has been studied from the viewpoint of its ability to predict dynamic loop shape of different materials in both the voltage- and current-driven regimes. The applicability of the model to soft magnetic materials over a wide range of dB/dt…