Materials Literature
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Photoconductive photodetectors fabricated using simple solution-processing have recently been shown to exhibit high gains (>1000) and outstanding sensitivities ( D* > 10(13) Jones). One ostensible disadvantage of exploiting photoconductive gain is that the temporal response is limited by the release of carriers from t…
Magnetic properties of $\mathrm{Bi}\mathrm{Fe}{\mathrm{O}}_{3}$ (BFO) single crystals with rhombohedral symmetry $(R3c)$ were measured in the temperature range of $4.2--350\phantom{\rule{0.3em}{0ex}}\mathrm{K}$. Zero field cooled (ZFC) and field cooled magnetization curves split below $250\phantom{\rule{0.3em}{0ex}}\m…
Linear dichroism (LD) in x-ray absorption, diffraction, transport, and magnetization measurements on thin La(0.7)Sr(0.3)MnO(3) films grown on different substrates, allow identification of a peculiar interface effect, related just to the presence of the interface. We report the LD signature of preferential 3d-e(g)(3z(2…
Peptide amphiphile (PA) molecules that self-assemble in vivo into supramolecular nanofibers were used as a therapy in a mouse model of spinal cord injury (SCI). Because self-assembly of these molecules is triggered by the ionic strength of the in vivo environment, nanoscale structures can be created within the extrace…
Thermally induced growth of graphene on the two polar surfaces of $6H\text{\ensuremath{-}}\mathrm{Si}\mathrm{C}$ is investigated with emphasis on the initial stages of growth and interface structure. The experimental methods employed are angle-resolved valence band photoelectron spectroscopy, soft x-ray induced core-l…
We present the results of a comparative analysis of profiles of the radiation-induced segregation of chromium after irradiation of model alloys Fe-(9, 11, 14) at % Cr by He + ions with the energy of 30 keV with fluences 10 19 –10 21 ions/m 2 at 450°C and data on varying the moduli of normal elasticity and the structur…
Amorphous carbon nitride thin films (a‐C:N) were deposited from a carbon target, at room temperature onto silicon substrates, by reactive RF sputtering in a gas mixture of argon and nitrogen. The structural properties of these films have been studied by Raman, infrared (IR), and X‐ray reflectometry spectroscopies. Bot…
Abstract Mechanical and corrosion properties of spot‐welded high‐strength austenitic stainless steels EN 1.4318 2H/C1150 and EN 1.4318 2H/C850 were studied. Microhardness measurements, lap shear and cross‐tension tests, corrosion fatigue tests and corrosion tests were carried out. The corrosion environment was 3.5% so…
The results of theoretical and experimental investigations of the phase transitions in ferromagnetic Heusler alloys with a thermoelastic martensitic transition are briefly discussed.
Abstract In this work, MoSi 2 – ZrO 2 -composites with different volume fractions (15-, 25-, 35 vol.% ZrO 2 ) were examined. Zirconium oxide was successfully tetragonal stabilised (metastable state) through a high temperature isostatic pressure process, where the tetragonal – monoclinic phase transformation is inhibit…
Shape recovery in iron‐based shape memory alloys is known to be incomplete. Thermomechanical cycling or training is recognized to improve the shape memory effect. In the present work, different aspects of training are studied: the number of cycles, the amount of deformation and the annealing temperature. As the number…
The actual occupancy of the two available cation sites by luminescent Eu 3+ ions, in the cubic bixbyite-type structure of nanocrystalline sesquioxides, has been investigated by 151 Eu Mössbauer spectroscopy and magnetic susceptibility measurements. It was found that one fourth of the europium ions is in the more symme…
There is several basic classes of recycling methods for FRP boats. The main one is mechanical recycling that is one of the simpler and more technically proven methods. It recently has been reported that FRP can be recycled by separating into laminated glass-fiber layers instead of crushing into powder. These mechanica…
The reaction of 30% solutions of TBP in hexachlorobutadiene (HCBD) with dissolved HNO 3 at its initial concentration of 1.2 M was studied in the range from 90 to 150°C. The kinetic parameters of HNO 3 consumption, gas release, and accumulation of dibutyl hydrogen phosphate were determined. The boundary temperature con…
The results of a study on the thermal dissolution of rubber crumbs and tire reclaim in mazut in the presence of ordinary shale from AO Leningradslanets (Slantsy) and high-sulfur shale from AO Slanets (Syzran) are reported. It was found that both rubber crumbs and tire reclaim were completely dissolved in the presence…
Autogenous gas tungsten arc welding to produce a dissimilar weld comprising austenitic and ferritic stainless steels was attempted. Defect free welds with over matching mechanical properties could be accomplished with a resultant weld metal consisting of a dual phase structure (ferrite and austenite). The pitting corr…
Ceramic samples of lead magnesium niobate (PMN) and (1 − x )Pb(Mg 1/3 Nb 2/3 )O 3 − x PbTiO 3 (PMN-PT) solid solutions with x = 0, 0.05, 0.10, and 0.30 have been prepared by solid-state reactions, and their structural, electrical, and piezoelectric properties have been studied using x-ray diffraction, Rietveld profile…
The relationship between base layers beneath a Ni catalyst and carbon nanofiber (CNF) growth was investigated at a deposition temperature of about 480 °C using a direct-current plasma-enhanced chemical vapor deposition system. Amorphous carbon was deposited on some base layers such as Pt, Ni, Cr, and W, while CNFs wer…
The paper deals with synthesis of nanocrystalline La 0.7 Sr 0.3 Mn O 3 (LSMO) and BaTiO 3 (BT) powder via hydroxide co-precipitation route. The particle size of the powder is determined using Williamson Hall method and is observed to be nearly 35 nm for LSMO and 120 nm for BT. To avoid occurrence of impurity phases th…
Partial Discharge (PD) signals character analyzing and interference suppressing are very important for PD on-line measurement. In this paper, chaos theory is introduced in the PD on-line monitoring. The mechanism of PD phenomena has been researched by series of typical insulation defect PD experiments in the lab. Thro…