Персона:
Крашевская, Галина Витальевна

Организационные подразделения

Организационная единица

Институт лазерных и плазменных технологий

Стратегическая цель Института ЛаПлаз – стать ведущей научной школой и ядром развития инноваций по лазерным, плазменным, радиационным и ускорительным технологиям, с уникальными образовательными программами, востребованными на российском и мировом рынке образовательных услуг.

Фамилия

Крашевская

Имя

Галина Витальевна

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Теперь показываю 1 - 9 из 9

Только метаданные
Hydrogen production in microwave discharge in water with barbotage of methane at atmospheric pressure: Experiment and modeling
(2024) Batukaev, S.; Krashevskaya, G. V.; Bilera, I. V.; Epstein, I. L.; Крашевская, Галина Витальевна
Только метаданные
Hybrid Microwave-DC Discharge in Nitrogen at Reduced Pressures
(2019) Lebedev, Y. A.; Titov, A. Y.; Epstein, I. L.; Krashevskaya, G. V.; Крашевская, Галина Витальевна
© 2019, Pleiades Publishing, Ltd.Abstract: The hybrid nonuniform microwave-DC discharge in nitrogen at pressure 1–15 Torr is studied by the method optical emission spectroscopy with spatial resolution. Discharge is ignited between the microwave powered antenna and grounded disk electrode placed at the distance of 2.5 cm from antenna. Antenna was positively biased relative to the grounded electrode. The ratio of the intensities of the nitrogen band at 337 nm and the emission of the ion band at 391 nm is used to determine the microwave field strength. Second positive system of nitrogen emission prevails over others in near antenna region. Emission of the first negative nitrogen ion system has the highest intensity near flat electrode. The vibrational distributions of nitrogen molecules and their dependence on direct current and position between antenna and grounded electrode are determined.
Только метаданные
Light emission from microwave discharges in liquid hydrocarbons at the initial stages of their development
(2021) Lebedev, Y. A.; Batukaev, T. S.; Epstein, I. L.; Krashevskaya, G. V.; Крашевская, Галина Витальевна
© 2021 Wiley-VCH GmbHTime-resolved optical techniques (spectrograph, high-speed camera, photodiode) were used for scrutinizing the initial stages of the microwave discharge (2.45 GHz, 200–500 W) achieved in liquid alkanes (CnH2n + 2). Petroleum solvent Nefras S2 80/120 (a mixture of light hydrocarbons with boiling temperatures ranging between 33°C and 205°C) was considered to be representative of alkanes. The discharge was ignited in the liquid, at the end of a molybdenum antenna located under ambient conditions above the liquid. The discharge displaced sequences of light pulses of different shapes and amplitudes, randomly distributed in time. The minimum pulse duration is 0.5 ms. At times close to 1 ms, the spectrum comprises emission bands of the C2 molecule, lines of hydrogen, and the C+ ion, but there is no continuum associated with the emission of the formed solid carbon-containing particles. In a number of cases, an anomalous spectrum of the C2 molecule was recorded, with no such sequences having been observed before.
Только метаданные
Time-Resolved Optical Diagnostics of the Microwave Discharge in Liquid Hydrocarbons with Argon Bubbling
(2022) Batukaev, T. S.; Lebedev, Y. A.; Krashevskaya, G. V.; Mikhailyuk, A. V.; Крашевская, Галина Витальевна; Михайлюк, Андрей Владимирович
© 2022, Pleiades Publishing, Ltd.Abstract—: The methods of emission spectroscopy, shadow photography, and integral radiation of a discharge with time resolution are used to study the initial stages of the development of a microwave discharge in liquid hydrocarbons when argon is supplied to the discharge region. As a representative of a wide range of hydrocarbons, the petroleum solvent Nefras C2 80/120 is used. With the help of shadow photographs, the change in the structure of the discharge with time was studied, and the sizes and growth rates of the gas bubble with plasma are determined. The emission spectra of the discharge, obtained at an exposure time of 1 ms, shows that, in addition to the usual Swan and CH bands, the spectrum contains atomic emission lines of Hα and of a carbon ion. The presence of these lines is associated with the big role of electron impact in the kinetics of processes in plasma at short times.
Только метаданные
Time resolved study of ignition of microwave discharge in liquid hydrocarbons
(2022) Lebedev, Y. A.; Batukaev, T. S.; Krashevskaya, G. V.; Mikhaylyuk, A. V.; Крашевская, Галина Витальевна; Михайлюк, Андрей Владимирович
© 2022 Wiley-VCH GmbHResults of the study of acoustic phenomena and changes in the structure of the microwave (2.45 GHz) discharge in liquid hydrocarbons in time are presented. Discharge was ignited at the tip of microwave antennas with conical or rounded ends. Petroleum solvent Nefras was chosen as representative of liquid hydrocarbons. Electret microphone and high-speed video cameras were used to study the discharge. It is shown that the discharge is always attached to the top of the cone in the case of the conical end of the antenna whereas ignition of the discharge generates in the gas part of the reactor a set of acoustic oscillations with frequencies corresponding to the characteristic oscillations of the reactor.
Только метаданные
Production of acetylene in a microwave discharge in liquid hydrocarbons with argon bubbling Получение ацетилена в СВЧ-разряде в жидких углеводородах с барботированием аргона
(2023) Batukaev, T. S.; Bilera, I. V.; Lebedev, Y. A.; Krashevskaya, G. V.; Крашевская, Галина Витальевна
Открытый доступ
Physical and Chemical Phenomena during the Production of Hydrogen in the Microwave Discharge Generated in Liquid Hydrocarbons with the Barbotage of Various Gases
(2023) Batukaev, T. S.; Bilera, I. V.; Krashevskaya, G. V.; Lebedev, Y. A.; Крашевская, Галина Витальевна
The physical and chemical characteristics of the microwave discharge in petroleum solvent during hydrogen production processes involving Ar, He, and CO2 barbotage were studied. Gas chromatography, emission spectroscopy, high-speed photography, and shadow photography were used for diagnosis. The results demonstrated the dependence of hydrogen yield on the flow rates of Ar, He, and CO2. The maximum yield values of hydrogen were 791 mL/min and 811 mL/min, while the maximum energy efficiency reached 135.6 NL/kWh and 162.2 NL/kWh in Nefras with Ar and He barbotage, respectively. The dynamics of discharge structure and the rotational and vibrational temperatures of C2 molecules were studied.
Открытый доступ
CO2 Decomposition in Microwave Discharge Created in Liquid Hydrocarbon
(2023) Batukaev, T. S.; Bilera, I. V.; Krashevskaya, G. V.; Lebedev, Y. A.; Крашевская, Галина Витальевна
The task of CO2 decomposition is one of the components of the problem associated with global warming. One of the promising directions of its solution is the use of low-temperature plasma. For these purposes, different types of discharges are used. Microwave discharge in liquid hydrocarbons has not been studied before for this problem. This paper presents the results of a study of microwave discharge products in liquid Nefras C2 80/120 (petroleum solvent, a mixture of light hydrocarbons with a boiling point from 33 to 205 В°C) when CO2 is introduced into the discharge zone, as well as the results of a study of the discharge by optical emission spectroscopy and shadow photography methods. The main gas products are H2, C2H2, C2H4, CH4, CO2, and CO. No oxygen was found in the products. The mechanisms of CO2 decomposition in the discharge are considered. The formation of H2 occurs simultaneously with the decomposition of CO2 in the discharge, with a volumetric rate of up to 475 mL/min and energy consumption of up to 81.4 NL/kWh.
Только метаданные
Hydrogen production in microwave discharge in water solutions of ethanol at atmospheric pressure
(2023) Batukaev, Т. S.; Bilera, I. V.; Krashevskaya, G. V.; Lebedev, Y. A.; Крашевская, Галина Витальевна