Materials Literature
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Ir/ZSM-5/cordierite was studied as promising catalyst for the reduction of nitrogen oxides from automobile exhaust under both stoichiometric combustion and lean conditions. ZSM-5 was in situ synthesized on the surface of honeycomb cordierite substrate and iridium was introduced to ZSM-5/cordierite by wet impregnation.…
Abstract Crevice corrosion of titanium and its alloys in 10% sodium chloride was investigated at 100°C with the aid of microelectrodes. Potential, pH and chloride ion concentration inside the crevice were monitored using an Ag/AgCl electrode, a tungsten microelectrode and a Ag/AgCl chloride ion selective microelectrod…
Original material of Campylodiscus clypeus (Ehrenberg) Ehrenberg ex Kützing, which is also the type of the name of the genus Campylodiscus Ehrenberg ex Kützing, was studied and a specimen has been selected to serve as lectotype. The size variation in two populations from two localities from two different times was ana…
In order to improve the magnetic properties of Nd–Fe–B thick film magnets prepared by pulsed laser deposition, high-speed crystallization method of a pulse annealing was adopted as a postannealing process. In the case of using a Nd2.4Fe14B target, the pulse annealing under an optimum condition for the period of 1.8s e…
Catalyst supports composed of titanate nanotubes were prepared from hydrothermal treatment on TiO2 nanoparticles in NaOH followed by HCl washing. The nanotubes exhibited well-defined TiO2 anatase phase after calcination at 400 degrees C. The nanotube aggregates and other commercially available TiO2 nanoparticles, all…
A theoretical model is proposed to describe the nucleation of deformation twins at grain boundaries in nanocrystalline materials under the action of an applied stress and the stress field of a dipole of junction or grain-boundary wedge disclinations. The model is used to consider pure nanocrystalline aluminum and copp…
The aim of this study was to explore and elucidate the possibility of employing an aliphatic polyamide 6,10 (PA 6,10) synthesized by a modified interfacial polymerization process as a novel rate-modulated monolithic matrix drug delivery system. A Plackett—Burman experimental design was used to synthesize 14 different…
A minute addition of multiwalled carbon nanotubes as a dopant is capable of hindering the ion transport in cells of low-resistivity nematic liquid crystal containing a significant quantity of ionic impurities. This phenomenon is manifested by the weakening of transient current induced by the polarity reversal of an ap…
Data on preparation of chitin threads for the fabrication of absorbable suture materials, dressings, and biodegradable substrates for the growth of human skin cells (keratinocytes and fibroblasts) are analyzed.
Multiferroic Bi 0.95− x La 0.05 Tb x FeO 3 (BLTFO) ceramics were prepared by hot‐pressing. It was found that their dielectric properties were very sensitive to sintering temperature. The samples hot‐pressed at 740°C show stable dielectric constant and rather low loss (∼1%) in the frequency range up to 1 MHz. When the…
Simultaneous thermal desorption and IR spectrometric studies of thermally stimulated transformations in thin films of cryovacuum condensates of water are carried out. It is shown that the temperature interval 12–36K is the existence region of a high-density form of amorphous solid water. The transition of amorphous hi…
Inorganic ceramic materials of the system Si‐(B‐)C‐N which are produced from preceramic polymers by solid state thermolysis have gained much interest during the last years because of their high temperature stability (up to 2000°C), their good oxidation resistance, and their mechanical and electrical properties. After…
A temperature dependent Raman scattering study in multiferroic single crystals RMn2O5 (R=Bi, Eu, and Dy) was performed. The Raman spectra were measured in the range from 150to450cm−1 involving mostly Mn–O–Mn bending vibrations, complementing our previous work in a higher frequency range involving Mn–O stretching modes…
The combination of yttria co‐stabilization and pulsed electric current sintering allowed full densification of CeO 2 ‐containing ZrO 2 ceramics in a graphite environment, while avoiding spontaneous catastrophic material degradation due to ceria reduction. Tetragonal ZrO 2 ceramics were obtained by pulsed electric curr…
The electric ship distribution lines supply various capacitive and inductive loads that must be switched in and out of the electrical power system. These loads result in the cables being exposed to overvoltages caused by switching operation The goal is to determine the reliability of high voltage cables when they are…
A new ZnO micro/nanostructure morphology in the form of micro-torches was grown in the family of ZnO hierarchical structures by a simplified thermal chemical vapour transport and condensation method using a vertical furnace. It is formed by two basic parts: a three-dimensional (3D) crystal base and one-dimensional (1D…
Vertically aligned carbon nanotubes, embedded in titanium oxide, have been fabricated and their electron emission behavior has been characterized. The growth of carbon nanotubes was achieved using a dc plasma enhanced chemical vapor deposition method with a mixture of acetylene and hydrogen, and nickel was used as the…
Valve morphogenesis stages in the araphid Synedra acus subsp. radians (Kütz.) Skabitch. were studied using of the light, fluorescent and electron microscopes. The most interesting and complete results were obtained with transmission electron microscope (TEM). Morphogenesis begins by the formation of a thin silica stra…
On the basis of high-density and uniform assembly of Au nanoparticles on carbon nanotube (CNT) surface and subsequently the convenient chemical vapor deposition technique, the nanowires with carbon nanotube core and uniform silica insulating shell were controllably synthesized and then efficiently integrated into top-…
The effect of the integration time step and the introduction of a cut-off velocity for the dislocation motion was analysed in discrete dislocation dynamics (DD) simulations of a single crystal microbeam. Two loading modes, bending and uniaxial tension, were examined. It was found that a longer integration time step le…