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Article
Application of Laser Scannung Thermography and Regression Analysis to Determine Characteristics of Defects in Polymer Composite Materials
The method of laser point scanning thermography is highly sensitive and allows for reliable detection of surface and subsurface defects in products made of polymer composite materials. When implementing this m...
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Article
Measurement of the Thermal Diffusivity of Optical Materials and Products by a New Thermographic Express Method That Does Not Require Cutting Samples Out of the Bulk
Thermal diffusivity a and thermal conductivity λ are important parameters for many structural and functional material applications. These parameters determine the intensity of heat transfer, the quality of the...
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Article
Experimental Study of the Spectral and Correlation Characteristics of Low-Frequency Fluctuations in Tungsten Filaments
Low-frequency current fluctuations in tungsten filaments are experimentally studied in a frequency interval of 6 × 10–5–1 Hz. The experiments are carried out at heating temperatures of the filaments of 2250 and 2...
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Article
Transmission Electron Microscopy: Study of the Bimetallic Nanoparticle Features
In this paper a comprehensive approach to study the morphology of particles and their structural characteristics, as well as the phase composition of multicomponent nanosystems, which combines the method of el...
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Article
Bridge Method for Studying the Spectra of Current Fluctuations in Tungsten Filaments in the Frequency Range 1.5·10–5–5·10–1 Hz
This article discusses the absence of methods for measuring low-frequency (LF) fluctuation processes at high temperatures and proposes an original bridge method for measuring the spectra of LF current fluctuat...
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Article
Morphology and Electrical Capacitance Characteristics of Nanostructured MnxOy/MWCNT Composites
Reducing potassium permanganate by a carbon matrix (multiwalled carbon nanotubes (MWCNTs)) in aqueous solutions, we have obtained MnxOy/MWCNT nanostructured composites (NSCs). The morphology and texture of the MW...
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Article
Study of the Spectrumof Low-Frequency Current Fluctuations in Filaments of Electric Lamps
We study experimentally the spectral characteristics of low-frequency current fluctuations in tungsten filaments of lighting lamps in the ranges of frequencies 2.5・10−4 – 5・10−1 Hz and temperatures 1260 – 2600 K....
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Article
Analysis of Phase Composition and CSR Sizes in Non-Equilibrium Nanostructured Systems Fe-Co and Ni-Cu Using Diffraction Maxima Simulations in a Doublet Radiation
The paper addresses the problem of determining phase composition, composition of mixed phases, and the CSR size in structurally similar metal systems where the most part of similar reflections of two phases ov...
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Article
Acoustic Testing in the Technology of Production of Construction Ceramics with Reinforcing Additives
The behavior of the sound spectrum of free vibrations of cylindrical ceramic samples for light yellow face bricks is interpreted depending on the firing conditions, as well as on reinforcing additives of finel...
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Article
Atomic Absorption Control of Ultimate Allowable Concentration of Elements in Meat Products without Sample Dissolution
In order to control the maximum levels of As, Cr, Pb, Cd, and Sn in meat products, it is proposed to transfer them to a suspension of 140 mg/mL and use an atomic absorption spectrometer with a graphite furnace...
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Article
Metrological Aspects of Measuring the Volume-Average Temperature of Filaments in Illuminating Lamps
We study metrological problems encountered in measuring the volume-average temperature of heated tungsten filaments. The process of heating is realized by electric currents within the temperature range 300–300...
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Article
A Two-Stage Probe Atomizer for Zeeman Atomic Absorption Spectrometry with High-Frequency Modulation of Radiation Polarization
A two-stage probe atomizer for direct analysis of samples that strongly smoke when evaporating (oil, food suspensions, etc.) by Zeeman atomic absorption spectrometry with high-frequency modulation of the polar...
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Article
Phase transformations in Cd–Ni nanostructured system at elevated temperatures
Using X-ray diffraction (both in vacuum and in air), derivatomass-spectrometry and thermo-programmed oxidation, phase transformations in nanostructured Cd–Ni system occurring while heating up 720 °C were descr...
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Article
The Characteristics of the Atomic Structure and Morphology of the Ni-Cores in the Ni/Au Core–Shell Nanoparticles
The Ni-nanoparticles, being similar to the nanocores of the Ni/Au core–shell nanoparticles, are made up of the structural domains with the dimensions about 1 nm. It is experimentally shown in this work for the...
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Article
Clay Modifier Activation for Ceramic Brick by Ultrasonic Extrusion
The properties of ceramic are studied in the case where clay is modified by adding small amounts of glass fiber in the process of ultrasonic extrusion of laboratory samples. Ultrasound increases the strengthen...
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Article
Prototy** of Ultrasonic Die for Extrusion of Ceramic Brick
A scaled-down prototype of a die for extruding ceramic brick with ultrasonic oscillations from a magneto-striction transducer delivered onto the die wall was tested. Extruder productivity was increased. There ...
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Article
Determination of the surface structure peculiarities of nanoscale metal particles via small-angle X-ray scattering
The typical distortions of the particle size distribution functions are calculated from the smallangle X-ray diffraction for nanoscale transition metal powders and their mutual binary systems. The abnormal neg...
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Article
Nanostructured carbon—Ni(OH)2 composites
Deposition of Ni(OH)2 from an aqueous solution of Ni(N3)2 onto highly porous carbon matrices of two types with different porous structure afforded high-purity nanostructured hydroxide—carbon composites with a reg...
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Article
Nanostructured composites based on highly porous carbon matrices filled with gold
High-purity, regularly shaped nanostructured gold-carbon composites with high specific surface area and porosity were obtained via the reduction of hydrogen tetrachloroaurate (III) by highly porous matrices de...
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Article
Nanostructured composites based on porous carbon matrices filled with nickel hydroxide crystallites
High-purity, nanostructured, morphologically uniform hydroxide-carbon composites filled with anhydrous Ni(OH)2 nanocrystallites (up to 40 wt %) and having a large specific surface area (600–1300 m2/g) and high po...
