24 Result(s)
within
Yu. A. Zakharov
Physics
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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
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
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
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
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
The influence of a probe on the optical path of atomic absorption spectrometer with a graphite tube atomizer
We have studied the influence on the atomic absorption signal of the obscuring of the transmission beam by a probe for the two-stage atomization in a graphite tube atomizer. The following parameters were varie...
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Article
Structure of nanosize bimetals Fe-Co and Fe-Ni
The phase composition and structural features of nano-size powders of Fe-Co and Fe-Ni systems synthesized by reducing the metal salts from strongly alkaline aqueous solutions are investigated by XAFS (XANES/EX...
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Article
Dynamics of fractional condensation of a substance on a probe for spectral analysis
The fractional separation of trace metals on a cold tungsten probe from salt matrix vapor, which interferes with the spectral analysis, is studied. The spatial structure of the vapor flows of sodium chloride, ...
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Article
Spatial structure of absorbing vapor in a transversely heated graphite atomizer with a probe
The dynamics of the spatial structure of absorbing layers of silver atoms and molecules and condensed particles of sodium chloride and potassium sulfate in a transversely heated graphite atomizer during atomiz...
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Article
Concentration of Analytes on the Probe in an Electrothermal Atomizer
To increase the sensitivity of the atomic-absorption analysis, we suggest concentrating the analytes on a tungsten probe through multiple fractional condensation of the sample vapor obtained in a graphite atom...
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Article
Electrothermal atomization of a substance with fractional condensation of the element being determined on a probe
This paper describes a method of electrothermal atomization with a fractional condensation of the elements being determined on a refractory probe with the aim of decreasing the matrix influences on the atomic-...
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Article
Separation of Silver from Chloride and Sulfate Matrices by Fractional Condensation in a Two-Step Graphite Atomizer
The influence of the excess of sodium chloride and potassium sulfate in a sample on the signal of atomic absorption of silver in a two-step graphite atomizer comprising a cup-evaporator and a tube-atomizer hea...
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Article
Two-Stage Evaporation of Silver Samples in a Graphite Atomizer
A study has been made of the process of separation of silver from the excess in a sample of alkali-earth chlorides and sulfates by two-stage evaporation from the wall of a graphite atomizer and by fractional c...
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Article
Influence of the Matrix on the Atomic Absorption of a Transversely Heated Graphite Atomizer
We have investigated the influence of the sodium chloride and potassium sulfate excess in a sample on the absorption signals of Ag, Al, Au, As, Bi, Cd, Cu, Ga, Ge, In, Mn, Pb, Sb, Se, Sn, and Tl in a transvers...
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Article
Atomic Absorption Spectrometry of Fire-Extinguishing Aerosols
The process of extinguishing a propane-air flame by aerosols of salt solutions has been investigated with the use of an atomic absorption spectrometer. The method of comparing aerosols in terms of the extingui...
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Article
Preexplosion phenomena in heavy metal azides
The paper reports results of investigation of the explosive decomposition of heavy metal azides in real time. The characteristics of the detected predetonation effects — the preexplosion conductance and lumine...
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Article
Explosive decomposition of heavy-metal azides
A real-time investigation of the explosive decomposition of heavy-metal azides is reported. A multichannel instrument configuration designed specifically for the goals of the study is described; it is capable ...
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Article
Explosive luminescence of silver azide
Spectroscopic-kinetic investigations of the luminescence accompanying the explosive decomposition of silver azide are performed. A new phenomenon is observed: predetonation luminescence. A comparison of the pr...
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Article
High time resolution spectroscopy studies of the explosive decomposition of silver azide
We have analyzed the existing assumptions about the mechanism of the explosive decomposition of the heavy metal azides. We present here a study of the kinetics of the explosive decomposition of silver azide, i...
