Materials Literature
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The title complex, {[Zn(ODIB)1/2(bpdc)]·2DMF} n was prepared under hydrothermal conditions (dimethylformamide and water) based on two ligands, namely, 1,1′-oxy-bis[3,5-diimidazolyl-benzene] (ODIB) and biphenyldicarboxylic acid (H2 bpdc). ODIB ligands link Zn cations to give layers in crystal. bpdc 2– anions coordinate…
The influence of a plane electric field on the phase states of barium titanate thin films under the conditions of forced deformation has been studied. The field dependence of a complete set of material constants has been taken in the region of the c -phase, where polarization losses are absent. The material constants…
The thermal reactions of mechanically milled wolframite and thermal coal mixtures have been investigated using Differential thermal analysis /thermogravimetry (DTA-TG), X-ray dffraction (XRD) and Scanning electron microscope (SEM). Mixtures were prepared according to stoichiometry and also with a 30% excess of coal. S…
Abstract The title compound is prepared by solid state reaction of a stoichiometric mixture of the elements (evacuated silica tubes, 1000 °C, 3 d).
The construction of new Ultra High Voltage laboratories requires more studies about standards for equipment as well as for testing and measurement techniques. Currently, the analysis of tail chopped lightning impulse waveforms is possible only by prior application of a full reference lightning impulse, creating diffic…
A classical model of the emission of radiation by relativistic electrons in a crystal has been developed using the form of the potential maximally close to its actual form. The dynamics of electrons with energies 20–25 MeV performing channeling in crystals is simulated numerically. The generation of electromagnetic ra…
Samples of desorbed NdRh3-based hydrides have been investigated by the X-ray diffraction method. X-ray data analysis showed that the samples contain two phases with hexagonal and cubic lattices. It was revealed that proportion of these phases in the samples depends on the rate of heating before the hydrogen desorption…
Features of formation of multilayer structure of composite with Al2O3 fibres and matrix of multicomponent alloys of iron and titanium was investigated. The composite was obtained by diffusion welding under pressure of a multilayer packet composed from foils of Fe- and Ti-alloys which were alternated with fragmented Al…
Lead magnesium niobate-lead titanate (PMN-PT) single crystal has first been successfully grown in 1990 by the Bridgman method using PbO as a flux. These single crystals have excellent piezoelectric properties. The PMN-PT crystals with different vibration modes may be used for development of novel high efficiency ultra…
S. M. Jeong and co-workers demonstrate on page 4848 the complete color conversion of mechanoluminescence (ML) from green to red using spontaneous fluorescent-dye-diffusion in zinc sulfide (ZnS) microparticles embedded in polydimethylsiloxane (PDMS) framework. The red luminescence could be achieved by 4-(dicyanomethyle…
Abstract The title compound is synthesized by solid state reaction of a mixture of NaNO3, Cr(NO3)3, and (NH4)6Mo7O24 in the molar ratio Na:Cr:Mo = 6:1:4 (973 K, 3 d).
Diamond films predominantly consisting of plane micrometer-size crystallites with a thickness of several dozen nanometers have been deposited from a methane–hydrogen gas mixture activated by a dc gas discharge. The crystallite structure has been studied by scanning and transmission electron microscopy and diffraction.…
The article describes the thermomechanical processes that occur under the influence of thermal effects in the structure of new metal-glass coatings of constructions of biological protection of vessels and floating facilities, which are intended for transportation and storage of radioactive cargo with a capacity of res…
В статье рассматриваются пути снижения потерь холостого хода в мощных асинхронных двигателях с целью повышения их энергоэффективности для соответствия требованиям современных стандартов и потребителей.Для асинхронных двигателей проведен сопоставительный анализ опытных потерь холостого хода с результатами расчетного ра…
The spectral research of a number of merocyanine dyes, the derivatives of aminocoumarin and the corresponding vinylog series of symmetric anionic polymethine dyes, has been carried out. A special attention is focused on the sensitivity of the absorption curve shape to the solvent polarity, which introduces a substanti…
At present, different powder materials are produced and powder products of different composition are manufactured. The most widespread are iron powder materials used in mechanical engineering. These materials are characterized by high strength combined with a high level of ductility and toughness and low tendency to b…
Abstract The FeII/III mixed cluster compounds Rb7[Fe4Te8], K7[Fe4Te8], K6[Fe4Se8], and K5Fe2Te5 are prepared by solid state reaction of stoichiometric amounts of the elements (Al2O3 crucibles sealed in steel autoclaves, 800—900 °C).
It has been shown that the number of high-intensity spin-wave modes in the spin-wave resonance spectrum of films with a uniform gradient of the effective anisotropy field depends on the thickness of the film and on the exchange stiffness. It has been established that there is a “critical” thickness of the film which d…
On a sock-knitting machine with diameter of cylindrical needle bed 100 mm (4e") that knitted with 400 needles, samples of fine women's hosiery were made from four PA filament yarns in counts 20 dtex f 20, 30 dtex f 34, 40 dtex f 40 and 60 dtex f 60. Each type of yarns was used to make hosiery samples with four loop si…
Microplastics have been prepared by impregnating aramid and glass fibers with of polysulfone melts of various viscosities unfilled and filled with montmorillonite. A minimum of the melt viscosity has been found at a montmorillonite content of 1 wt %. Radial-transverse impregnation of multifilament fiber by a thermopla…