Materials Literature
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The problem of the estimation of the reliability of a metal-composite overwrapped pressure vessel for the electrojet engine unit of a satellite vehicle is considered. The functions of probabilities of failure-free performance according to impermeability and strength criteria are used as reliability characteristics. Th…
The evolution of hysteretic magnetic properties and the characteristics of magnetic noise caused by Barkhausen jumps have been studied in different ranges of annealing temperature where different processes of structural relaxation develop. It has been shown that the amorphous cobalt-based alloy under study is characte…
We investigated the temperature dependences of the kinematic viscosity of liquid Al–Fe alloys with an iron content from 3.5 to 10 at %. We discovered a bifurcation of the viscosity polytherms obtained upon heating and subsequent cooling. We show that the value increase observed in the viscosity polytherm at melt heati…
Three waves of apoptosis shape the development of Caenorhabditis elegans. Although the exact roles of the three DNase II genes (nuc-1, crn-6 and crn-7), which are known to mediate degradation of apoptotic DNA, in the embryonic and larval phases of apoptosis have been characterized, the DNase II acting in the third wav…
The pitting corrosion characteristics of low carbon steel specimens are studied by acoustic emission (AE) and electrochemical techniques, in a 3.0 wt.% NaCl solution acidified to pH 2.0. The acoustic emission signals generated by pitting corrosion are classified based on multiple acoustic emission parameters using K‐m…
The question of the reduction of waste production and the method of safe, environmentally acceptable and economically profitable use or disposal of waste has currently been a very widely discussed global issue from the point of view of the environment. According to data from the statistics of the largest companies in…
Článek shrnuje aspekty zkoušení a ovlivňování soudržnosti výztuží s betonem. Úzce se zaměřuje na hodnocení míry vlivu nevyhnutelné koroze povlaku žárového zinku v čerstvém betonu na samotnou soudržnost. Ovlivnění soudržnosti vlivem vývoje vodíku a expanzních korozních produktů zinku je ověřováno na hladkých ocelových…
The phase composition of the 3 nm surface layer of Ti and TiN films is studied by X-ray photo-electron spectroscopy. The films are deposited by the electric arc sputtering of a titanium cathode in a nitrogen atmosphere under a magnetic field. It is shown that the film surface layer contains TiN, TiN x , TiO x , TiO2,…
Cu 2 ZnSnS 4 (CZTS) is a main candidate material for solar energy conversion through both photovoltaics and photocatalysis based on environmentally friendly elements and with a direct band gap of 1.5 eV. We report the synthesis of quasi Cu 2 ZnSnS 4 microparticles with unprecedented narrow size distributions. The stru…
This paper presents chosen results of theoretical and experimental research works on a new metal forming process of two-rib plates.The first part of the paper deals with forging technology of such products in a three-slide forging press, assuming two variants of the process: semi-open die forming and closed-die formin…
An analytical approach was developed to investigate nucleation, recalescence and growth of Ti-48Al (at.%) alloy droplets during their flight in a gas atomization process. Evolution of microstructure of the solidified powders was quantitatively investigated using scanning electron microscopy, transmission electron micr…
The mechanism of thermogenesis and thermolysis of transformer was analyzed in this paper, the position of the hot-spot temperature was also analyzed. By calculating winding average surface temperature rising, a hot-spot temperature calculating model of dry -type transformer was established, and the calculating model o…
Nanotechnologies have potential to be used in transformer industry in enhancing material properties which may lead to a compact design of transformer and reduced manufacturing cost. Effect of adding different nanoparticles such as titania, silica, nano-diamond, etc. has been studied in literatures. In this paper, nano…
We analyze a model statistical description of the polypeptide chain helix-coil transition, where we take into account the specificity of its primary sequence, as quantified by the phase space volume ratio of the number of all accessible states to the number corresponding to a helical conformation. The resulting transi…
The effects of adding 1 wt.% Al element on the oxidation behavior of CM-247LC Ni-based superalloy are studied under high temperature conditions, namely, 1000°C and 1150°C dry air isothermal oxidation test. The microstructure of oxides, γ matrix and γ′ precipitate are observed and analyzed by using X-ray diffraction (X…
Hypotheses on how first-order phase transitions develop which deny a fundamental element of the classical thermal fluctuation theory, namely, that the nucleation of a new phase must take place when the crystal lattice changes, are considered. It is shown that the thermal fluctuation theory does not work for polymorphi…
In the present research, zinc oxide (ZnO) films have been prepared by simple solution method and spray pyrolysis on different substrates (glass and sapphire) for different molar concentrations (0.2M & 0.25M). The films were subjected to different substrate temperatures (400 °C and 450 °C respectively. These were chara…
Limestone soil in karst areas is the product of weathering and carbonate rock dissolution in tropical and subtropical regions. Limestone soil in karst regions has a Ca-rich alkaline geochemical environment, but the characteristics of calcium speciation in limestone soil remain unclear. Here, to study changes in calciu…
In this study we used simultaneous grazing-incidence small- and wide-angle X-ray scattering (GISAXS and GIWAXS, respectively) to probe the multilength-scale structures of thin active layers comprising the linear A–D–A-type π-conjugated donor molecule TBDTCNR and the fullerene acceptor molecule PC 61 BM for use in solu…
The target model of the NRNU MEPhI provides, in particular, the transition to the use of distance learning platforms, integrated with the international educational environment and social learning networking. A special place in education network is allocated to computer tools to support the learning process. These tool…