Персона:
Акишев, Юрий Семенович

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.

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Акишев

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Юрий Семенович

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Теперь показываю 1 - 10 из 33

Только метаданные
Pin-to-plane self-pulsing discharge in transversal airflow: interaction with a substrate of plasma filaments blown out from the discharge zone
(2020) Akishev, Y. S.; Balakirev, A. A.; Grushin, M. E.; Karalnik, V. B.; Акишев, Юрий Семенович
The pin-to-plane electrode system for the multi-sectioned discharge in the transversal airflow at atmospheric pressure has been developed. The airflow is directed perpendicularly to the electric current. As it was revealed, all sections of the multi-sectioned discharge operate identically and independently to each other. For this reason, the spatial-temporal behavior of the discharge excited only in a single section was investigated. The pin-to-plane discharge (PPD) was powered by a positive polarity DC voltage that induces the spontaneously repeating streamer-spark breakdowns in a discharge gap. Each breakdown forms the plasma filament (PF) which is being further blown out of the discharge zone and stretched by the airflow. The PF impacts a dielectric plate located in the path of the airflow at different distances away from the discharge zone. Two modes in the behavior of the blown-out PF have been revealed. When the plate is close to the discharge zone, the blown-out PF is tightly pressed by the flow to the plate. In this case, both the brightness and electric current of the PF are periodically pulsing with a high frequency up to the plasma filament breaking up due to its strong elongation by the flow. If the plate is far away, the quasistationary regime happens. During the PF elongation in this regime, plasma filament keeps both the brightness and current approximately changeless till the filament breaking up. At In this regime, the blown-out PF is being stretched in parallel to the surface without contacting it. The release of energy into the PF continues also in the course of its blowing out until its impinging the object located in the path of airflow. Due to that, the PPD pulsing mode generates a lot of reactive species inside the PF up to its impinging the object to be treated. This is a reason why the self-pulsing PPD can be highly effective for surface processing by non-thermal plasma.
Только метаданные
Irradiation of Mesenchymal Stem Cells with an Argon Plasma Jet with Various Oxygen Admixtures
(2025) Zakharchenko, A. E.; Domnin, P. A.; Kalinin, E. V.; Grosheva, A. G.; Akishev, Y. S.; Акишев, Юрий Семенович
Только метаданные
Formation of Extended Tubular Plasma in Argon at Low Pressure and in a Weak Longitudinal Magnetic Field
(2024) Akishev, Y. S.; Bakhtin, V. P.; Buleyko, A. B.; Loza, O. T.; Акишев, Юрий Семенович
Только метаданные
The Methods of Streamer Formation in/on Dielectric and Conductive Liquids
(2023) Akishev, Y.; Акишев, Юрий Семенович
Только метаданные
Gas-discharge source of coaxial and opposite directed plasma jets based on a barrier discharge in radially converging gas flow Газоразрядныи источник соосных и разнонаправленных плазменных струи на основе барьерного разряда в радиально-сходящемся потоке
(2020) Petryakov, A. V.; Trushkin, N. I.; Akishev, Yu. S.; Акишев, Юрий Семенович
© 2020 Federal Informational-Analytical Center of the Defense Industry. All rights reserved.An original source of non-equilibrium low-temperature plasma jets based on a barrier discharge in radially converging flow of atomic and molecular gases at atmospheric pressure was developed and created. The electrode discharge system consists of two parallel quartz disks, in the geometric center of which are made two coaxial identical holes. A metal foil in the form of a wide ring aligned with the holes is glued to the outside of each disk. The gas flow is directed from the periphery of the disks to their center and goes out normal to the surface of the disks through narrow openings. As a result, two coaxial plasma jets are formed, perpendicular to the disks and directed in different directions. In the published literature there are no analogues of the developed source of two coaxial and opposite directed plasma jets. The source was tested for plasma treatment of dielectric yarns, which were pulled through holes in barriers and were constantly enveloped by non-thermal plasma jets. The results of the work show the practical possibility of using the created gas-discharge source for continuous “roll-to-roll” plasma treatment of polymer filaments in order to improve their hydrophilicity.
Только метаданные
On the Development of Ionization Waves Preceding Breakdown in a Long Capillary Tube Filled with Helium at Low Pressure
(2021) Karal'nik, V. B.; Petryakov, A. V.; Ionikh, Y. Z.; Akishev, Y. S.; Акишев, Юрий Семенович
© 2021, Pleiades Publishing, Ltd.Abstract: Experiments that revealed the main trends in the development of complete breakdown in a long capillary tube for different electrode configurations are reported. It is demonstrated that, in the presence of an additional external electrode around the tube, a fast stage completing the breakdown is preceded by a slow stage caused by development of a weak-current surface barrier discharge inside the tube. This discharge is realized due to propagation of forward (from the high-voltage electrode) and backward (from the grounded electrode) surface ionization waves. The presence of preliminarily, locally deposited charge of the sign opposite to polarity of the voltage pulse leads to acceleration of propagation of ionization waves in the tube. In the absence of the external electrode, the breakdown occurs much faster but is characterized by a large scatter in the delay time (up to complete lack of breakdown) relative to the applied voltage pulse. Unstable operation of the gas-discharge device determined by development of breakdown represents a much more serious problem in many applications compared to the situation in which it turns on slowly but stably. Therefore, the results demonstrating the possibility of controlling the breakdown are of great scientific and practical value.
Только метаданные
Ionization wave propagation in a long capillary tube in the presence of a low-current glow discharge in low-pressure helium
(2021) Karalnik, V. B.; Petryakov, A. V.; Akishev, Y. S.; Акишев, Юрий Семенович
© 2021 Institute of Physics Publishing. All rights reserved.The experimental results on the study of the positive ionization wave propagating along a long capillary tube are presented. The ionization wave was initiated by eigther highvoltage pulse of positive polarity applied over a long capillary tube with helium or high-voltage pulse applied over the same tube but in presence of low-current glow discharge. The spreading of this wave is accompanied by the surface charge deposition. The usage of the fine-sectioned outer electrode allows one to find out the features of the positive ionization wave in both cases (with or without low-current discharge).
Только метаданные
The Memory Effect of Microdischarges in the Barrier Discharge in Airflow
(2020) Usenov, E. A.; Petryakov, A. V.; Ramazanov, T. S.; Gabdullin, M. T.; Akishev, Y. S.; Акишев, Юрий Семенович
© 2020, Pleiades Publishing, Ltd.Abstract: The paper devoted to the research of the microdischarge dynamics in the dielectric barrier discharge. The discharge between rail electrodes in airflow along the electrodes at atmospheric pressure was studied. The aim of this work is to clarify the role of volume plasma and surface charges in the memory effect of microdischarges. Based on the analysis of microdischarge images obtained using high-speed camera, it is established that the transport of microdischarge plasma by a gas flow determines the microdischarge localization in each subsequent half-cycle of the applied voltage. An important part is played by the turbulence and the presence of vortices in the airflow. They determine both the speed of plasma channel transfer and the probability of the microdischarge appearence in a specific half-cycle. The results of the work show the possibility of the gas-dynamic control for parameters of a barrier discharge.
Только метаданные
INFLUENCE OF CORONA AND STREAMER DISCHARGES ON THE BEHAVIOR OF LARGE AIR BUBBLES ARTIFICIALLY FORMED ON/IN A LIQUID
(2021) Akishev, Y.; Акишев, Юрий Семенович
The paper presents information about the behavior of large air bubbles artificially formed on/in water and oil and influenced by corona and streamer discharges. The large bubbles are not breakdown promoters like microbubbles, which are considered to be dangerous inclusions in a dielectric liquid from an electrical engineering point of view. The large bubbles themselves are the objects influenced by the discharge, leading to abundant enrichment of the liquid by biochemically reactive plasma species. This is why studying the discharge-bubble interaction has great importance. The large bubbles were formed on water and oil inside a narrow dielectric tube filled with water. The behavior of floating bubbles under the influence of the discharge depends on the liquid forming the bubbles. In the case of the water and streamer generated above a bubble, the streamer striking the bubble does not immediately perforate it but slides along the bubble down to its base. The streamer is hot. Therefore, over time it evaporates the bubble wall and triggers the destruction of the bubble. If an air bubble floats on oil, the streamer impact leads immediately to local bubble perforation followed by its fast destruction as it bursts. The air bubbles inserted into a dielectric tube were influenced by the streamer discharge developing inside the bubbles. Two regimes of bubble behavior were observed. The first regime exhibits itself as the bubble's length changes over a long period of time. The second regime manifests itself over a short period of time as fast streamer breakdown develops along the chain of bubbles.
Только метаданные
Electrical analysis and ultra-fast sequential imaging of surface barrier discharge with streamer-leader sequence generated with 100 kHz frequency at the water interface
(2019) Synek, P.; Petryakov, A.; Trushkin, N.; Vorac, J.; Akishev, Y.; Акишев, Юрий Семенович
A time resolved study of the electrical parameters and ultra-fast 2D imaging of the surface barrier discharge emerging from liquid electrodes in atmospheric pressure argon is reported. Analysing the electrical measurements and the charge-voltage (Q-V) plots, a resistive component of the electrical system impedance is revealed and described by the logical progression of the method to current-voltage (I-V) plots. The necessity to include a resistive component in the simplest equivalent circuit is demonstrated. Net discharge current, charge or effective gap voltage are linked to the light emission. A special nanosecond-gated camera enabling multiple expositions within a few hundreds of nanoseconds is applied and reveals the spatiotemporal development of the discharge luminosity. Propagation of the streamer-leader stepping sequence on the dielectric surface is observed and the mean velocities and axial light-emission development is quantified. A light emission of an excited gas prior to and after the discharge's main current peak is detected revealing an increased activity between the subsequent discharges. This is caused by the high pre-ionisation of the gas volume and the intensive charging of the surface. The generation of subsequent streamers emerging from/between the surface charge domains is evidenced.