EVALUATION OF THE POSSIBILITY OF IMPROVING SHOCK-ABRASIVE PERFORMANCE OF COMPOSITE MATERIALS AT THE ACCOUNT OF OPTIMIZATION OF THEIR ELASTIC-DISSIPATIVE PROPERTIES
П.В. Сиротин, Б.Г. Гасанов
Materials Literature
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Why GeO2 growth on Ge is suppressed and GeO2/Ge stack is much improved in high pressure O2 oxidation?
This paper reports for the first time a new kinetic model of thermal oxidation of Ge that considers both O-vacancy and atomic O diffusion as a function of O2pressure. The model is based on newly obtained results that Ge oxidation is described by kinetics completely different from the Deal-Grove model and that it exhib…
Reduced Schwarz-Christoffel Conformal Mapping in Surface-Mounted PMSM
Schwarz-Christoffel conformal mapping method is widely used in modeling of air gap flux density distribution of electrical machines. It should not be as time consuming as definition and calculation of the finite element model but provides results with high accuracy. Also the improved saturation model can be applied to…
Temperature Quenching and Fluorescence Depolarization of Carbon Nanodots Obtained via Paraffin Pyrolysis
Abstract A temperature effect on fluorescence intensity and polarization of a colloidal system of carbon nanodots in glycerol under linearly polarized pumping conditions is studied. Nanodots are obtained via pyrolysis of paraffin in nanopores of a mesoporous silica. An increase in temperature leads to quenching of nan…
Yb3+-activated optical fibers with a core fabricated by sintering powders with vibration mixing of the melt
Using sintering of powders in combination with vibration mixing of the melt, glasses for cores of preforms of optical fibers of the composition SiO2-Al2O3-P2O5-Yb2O3 with a rather high (up to 0.5 at. %) ytterbium content were fabricated. Lasing on ytterbium ions was obtained in light guides with a core of these glasse…
Features of ZnO Nanocrystal Size Distribution in a Polymer Matrix
Abstract X-ray diffraction patterns of a photocurable epoxy acryl-based polymer composite with addition of ZnO nanocrystals are analyzed. We recover the size distribution function of the ZnO nanocrystals and estimate the median size of the nanocrystals (∼40–50 nm) from a detailed analysis of the most intensive peak in…
Study of the Dynamics of Water Droplet Freezing on the Surface of Nanocomposites in the Long-Wavelength Infrared Range
Abstract A technique is developed to determine the freezing time, thermal resistance, heat transfer coefficient, and cooling power of water droplet on the surface of studied materials by means of video recording in the long-wavelength infrared range. These parameters are found for water droplets on a hydrophobic coati…
Development of a Spherical Vacuum Window for Cryogenic Receiver
Vacuum window is a key part of a cryogenic receiver, which isolate the feed from the ambient environment. Traditional flat vacuum window leads to a metal flange over the aperture of the feed, which inevitably distorts the radiation pattern of the feed and degrades the performance of the reflector antenna. This paper p…
INFLUENCE OF THE DIAMOND-CEMENTED CARBIDE MATRIX TRANSITION ZONE STRUCTURE ON THE SPECIFIC PRODUCTIVITY OF RULING TOOL OBTAINED BY DIAMOND METALLIZATION DURING SINTERING WITH COPPER IMPREGNATION
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Towards Building a Coordinate Clustered Library for Template-Based Modeling of Protein Structures
Biological activities of a human body are significantly influenced by proteins. The function of a protein can be identified by its structure. So, it is necessary to develop computational tools to predict the structure of a given protein, as experimental methods are costly and laborious. Many computational methods are…
Genetic variability in Acidithiobacillus spp. – a working horse of environmental biotechnologies
Abstract The genus Acidithiobacillus comprises 7 species of Gram-negative obligatory acidophilic chemolithotrophic bacteria that derive energy mainly from the oxidation of reduced sulphur compounds. Four of the species also catalyse the dissimilatory oxidation of ferrous iron while three (A. thiooxidans, A. albertensi…
Influence of Dopants on Structure of Polycrystalline Bismuth Niobate
Abstract Bismuth niobate (BiNbO4) has attracted attention as a low-fired ceramics with promising microwave application potential. BiNbO4 ceramics was fabricated by mixed oxide method and sintered at temperature T<1000°C. As the sintering aids a small amount of CuO oxide was used. The crystalline structure of the ceram…
Monte Carlo simulation of coil-to-globule transition of compact polymer chains: Role of monomer interacting
Coil-to-globule transitions are fundamental problems existing in polymer science for several decades; however, some features are still unclear, such as the effect of chain monomer interaction. Herein, we use Monte Carlo simulation to study the coil-to-globule transition of simple compact polymer chains. We first consi…
High-Temperature Studies of the Structure of Complex Oxides Based on Bi26Mo10O69–d
Complex oxides with the general formula Bi 26–2 x Me 2 x ′ Mo 10 O 69– d , Bi 26 Mo 10–2 y Me 2y ′′ O 69– d are synthesized by the standard ceramic technology, certified and analyzed by high-temperature X-ray and neutron diffraction techniques. Specific features of the structures of triclinic and monoclinic modificati…
APPLICATION OF ATOMIC EMISSION SPECTROMETRY WITH INDUCTIVELY COUPLED PLASMA FOR THE ANALYSIS OF ELECTROLYTES DURING ELECTROLYTIC EXTRACTION OF THE PHASES OF NICKEL ALLOYS
Для количественной оценки фазового состава высоколегированных сплавов применяют электролитическую экстракцию фаз, которая включает: анодное растворение образца сплава, сбор анодного осадка, исследование фазового и химического состава анодного осадка и, по результатам этих исследований – расчет массовой доли фаз в обра…
Spectral-Kinetic Properties of Nanosized Nickel Phthalocyanine Films on Silver Nanoparticle Monolayers
Abstract We have investigated spectral and spectral-kinetic properties of hybrid (organic semiconductor-plasmonic metal) nanocomposites on the base of silver nanoparticle monolayers and thin nickel phthalocyanine (NiPc) films. The spectroscopic results obtained by the femtosecond pump-probe technique demonstrate an en…
Cooling of mechanical vibrations by heat flow
We theoretically consider a nanomechanical link between two metallic leads subject to a temperature drop. It is shown that mechanical dynamics of such system can be strongly affected by a heat flow through it via the position dependent electron-electron interaction, even though the electronic transport between leads i…
Performance Evaluation of Centralized Reconfigurable Transmitting Power Scheme in Wireless Network-on-chip
Network-on-chip (NoC) is an on-chip communication network that allows parallel communication among all cores to improve inter-core performance. Wireless NoC (WiNoC) introduces long-range and high bandwidth radio frequency (RF) interconnects that can possibly reduce the multi-hop communication of the planar metal inter…
Four-step fabrication of SERS-active microfluidic channels
We present a technique to fabricate SERS substrates fully integrated with microfluidic channels. The fabrication of microsized dielectric channels was based on selective wet etching of a poled/unpoled silicate glass while silver nanoisland film was grown on the bottom of the channels via out-diffusion technique. Diffe…
Size effect on the three state thermal hysteresis of a 2D spin crossover nanoparticles
In this report first we show, in a framework of the Ising-like model, a numerical simulation of a typical two step thermal transition obtained for a square lattice 12x12: a "first-step hysteresis" for a high spin fraction Nhs between 0 - 0,5 and at a higher temperature a "second-step hysteresis" with Nhs between 0.5 a…