I. Kossyi - Academia.edu (original) (raw)
Papers by I. Kossyi
42nd AIAA Aerospace Sciences Meeting and Exhibit, 2004
41st Aerospace Sciences Meeting and Exhibit, 2003
Plasma Physics Reports, 1997
Technical Physics, 2003
The propagation of intense microwave radiation in a water column is studied experimentally. The e... more The propagation of intense microwave radiation in a water column is studied experimentally. The effect of induced transparency of water is discovered. The effect is related to the successive heating of water layers from the surface deep into the water column. The interaction of intense microwave radiation with water is simulated with account of variations in the electrophysical water parameters. The simulation results are compared with the experimental data.
Plasma Sources Science and Technology, 2005
An attempt is made to explain the phenomenon known as a ‘Raether paradox’ which consists of the a... more An attempt is made to explain the phenomenon known as a ‘Raether paradox’ which consists of the abnormally deep penetration of ionization-causing radiation from a localized gas discharge into the surrounding high-pressure gas. Based on a theory worked out (by the example of the interaction of equilibrium radiation with molecular nitrogen), it is shown that a model accounting for the
Plasma Physics Reports, 2013
ABSTRACT The characteristics of a microwave discharge in an argon jet injected axially into a coa... more ABSTRACT The characteristics of a microwave discharge in an argon jet injected axially into a coaxial channel with a shortened inner electrode are numerically analyzed using a self-consistent equilibrium gas-dynamic model. The specific features of the excitation and maintenance of the microwave discharge are determined, and the dependences of the discharge characteristics on the supplied electromagnetic power and gas flow rate are obtained. The calculated results are compared with experimental data.
Plasma Physics Reports, 2001
Results are presented from experimental studies of the destruction of chlorofluorocarbon (CF2Cl2)... more Results are presented from experimental studies of the destruction of chlorofluorocarbon (CF2Cl2) molecules in a methane-oxygen (air) gas mixture whose combustion is initiated by a high-current slipping surface discharge. It is found that a three-component CH4+O2(air)+CF2Cl2 gas mixture (even with a considerable amount of the third component) demonstrates properties of explosive combustion involving chain reactions that are typical of two-component
Plasma Physics Reports, 2009
Plasma Physics Reports, 2004
ABSTRACT The temperature of the neutral component in a repetitive microwave torch excited in an a... more ABSTRACT The temperature of the neutral component in a repetitive microwave torch excited in an argon jet injected into atmospheric air is measured using different optical methods. The microwave energy is efficiently converted into the thermal energy of the argon jet. The gas temperature is maximum at the nozzle, where it reaches 4.5–5.0 kK, and decreases to 2.5–3.0 kK along the jet. The torch plasma, which is not in thermal equilibrium, drastically influences the working gas and the surrounding air.
Journal of Physics D: Applied Physics, 1996
ABSTRACT
Russian Microelectronics, 2012
ABSTRACT Investigations of nanoscale silicon powders obtained by plasma chemical synthesis in var... more ABSTRACT Investigations of nanoscale silicon powders obtained by plasma chemical synthesis in various process parameters were carried out by transmission electron microscopy, X-ray photoelectron spectroscopy, and infrared (IR) spectroscopy. It was demonstrated that the powders consist of spherical particles with an average diameter from 20 to 30 nm. Each particle includes a single-crystal silicon core and amorphous shell whose chemical composition is defined by bonds of silicon with oxygen and hydrogen. The measurements of photoluminescence (FL) show the presence of dim near-infrared FL in the specimen powders, and more intensive emission around 420 nm in the suspension of the powder in ethanol. The character of this emission has not been determined yet.
Instruments and Experimental Techniques, 2006
ABSTRACT
41st Aerospace Sciences Meeting and Exhibit, 2003
2008 IEEE 35th International Conference on Plasma Science, 2008
Physical principles underlying the operation of a pulsed coaxial microwave plasma source (micro w... more Physical principles underlying the operation of a pulsed coaxial microwave plasma source (micro wave plasmatron) are considered. The design and parameters of the device are described, and results of exper imental studies of the characteristics of the generated plasma are presented. The possibility of application of this type of plasmatron in gas discharge physics is discussed.
Progress in Flight Physics – Volume 7, 2015
Journal of Physics D: Applied Physics, 2014
Instability waves in the shear layer of turbulent jets are known to be a significant source of je... more Instability waves in the shear layer of turbulent jets are known to be a significant source of jet noise, which makes their suppression important for the aviation industry. In this study we apply plasma actuators in order to control instability waves in the shear layer of a turbulent air jet at atmospheric pressure. Three types of plasma actuators are studied: high-frequency dielectric barrier discharge, slipping surface discharge, and surface barrier corona discharge. Particle image velocimetry measurements of the shear layer demonstrate that the plasma actuators have control authority over instability waves and effectively suppress the instability waves artificially generated in the shear layer. It makes these actuators promising for application in active control systems for jet noise mitigation.
Journal of Atomic and Molecular Physics, 2013
Multispark discharge excited in water is described, and its useful physical and chemical properti... more Multispark discharge excited in water is described, and its useful physical and chemical properties are discussed in the light of some environmental issues. Discharge of such a type generates hot and dense plasmoids producing intense biologically active UV radiation and chemically active radicals, atoms, and molecules. Simultaneously, discharge creates strong hydrodynamic perturbations and cavitation bubbles. Particular attention is given to factors influencing on water purity with special reference to discharge application for effective sterilization of water and its cleaning of harmful chemicals. The gas discharges of this type show considerable promise as a means for solving some actual plasma-chemical problems. The above-mentioned discharge properties have been demonstrated in a series of laboratory experiments, which proved the efficiency of disinfection of potable and waste water, water cleaning of pesticide (herbicide) contaminations, and conversion (recovery) of natural methane.
Journal of water and health, 2004
The aim of this work was to investigate the effectiveness of a high voltage multi-spark electric ... more The aim of this work was to investigate the effectiveness of a high voltage multi-spark electric discharge, with pulse energy of 1 Joule, in killing microorganisms in wastewater. Wastewater from primary treated effluent arising from domestic and industrial sources was abstracted for continuous pulsed discharge disinfection. The wastewater contained a large mixed population of microorganisms (approximately 10(7) CFU ml(-1) [10(9) CFU 100 ml(-1)] total aerobic heterotrophic bacteria) including vegetative cells and spores. The electrical conductivity of the wastewater ranged from 900-1400 microS cm(-1) and it was shown that a specific energy of 1.25-1.5 J cm(-3) was required to achieve 1 log reduction in bacterial (faecal coliforms/total aerobic heterotrophs) content. This is higher than that previously shown to reduce the population of E. coli in tap water of low conductivity, demonstrating the role of total wastewater constituents, including dissolved and particulate substances, wate...
42nd AIAA Aerospace Sciences Meeting and Exhibit, 2004
41st Aerospace Sciences Meeting and Exhibit, 2003
Plasma Physics Reports, 1997
Technical Physics, 2003
The propagation of intense microwave radiation in a water column is studied experimentally. The e... more The propagation of intense microwave radiation in a water column is studied experimentally. The effect of induced transparency of water is discovered. The effect is related to the successive heating of water layers from the surface deep into the water column. The interaction of intense microwave radiation with water is simulated with account of variations in the electrophysical water parameters. The simulation results are compared with the experimental data.
Plasma Sources Science and Technology, 2005
An attempt is made to explain the phenomenon known as a ‘Raether paradox’ which consists of the a... more An attempt is made to explain the phenomenon known as a ‘Raether paradox’ which consists of the abnormally deep penetration of ionization-causing radiation from a localized gas discharge into the surrounding high-pressure gas. Based on a theory worked out (by the example of the interaction of equilibrium radiation with molecular nitrogen), it is shown that a model accounting for the
Plasma Physics Reports, 2013
ABSTRACT The characteristics of a microwave discharge in an argon jet injected axially into a coa... more ABSTRACT The characteristics of a microwave discharge in an argon jet injected axially into a coaxial channel with a shortened inner electrode are numerically analyzed using a self-consistent equilibrium gas-dynamic model. The specific features of the excitation and maintenance of the microwave discharge are determined, and the dependences of the discharge characteristics on the supplied electromagnetic power and gas flow rate are obtained. The calculated results are compared with experimental data.
Plasma Physics Reports, 2001
Results are presented from experimental studies of the destruction of chlorofluorocarbon (CF2Cl2)... more Results are presented from experimental studies of the destruction of chlorofluorocarbon (CF2Cl2) molecules in a methane-oxygen (air) gas mixture whose combustion is initiated by a high-current slipping surface discharge. It is found that a three-component CH4+O2(air)+CF2Cl2 gas mixture (even with a considerable amount of the third component) demonstrates properties of explosive combustion involving chain reactions that are typical of two-component
Plasma Physics Reports, 2009
Plasma Physics Reports, 2004
ABSTRACT The temperature of the neutral component in a repetitive microwave torch excited in an a... more ABSTRACT The temperature of the neutral component in a repetitive microwave torch excited in an argon jet injected into atmospheric air is measured using different optical methods. The microwave energy is efficiently converted into the thermal energy of the argon jet. The gas temperature is maximum at the nozzle, where it reaches 4.5–5.0 kK, and decreases to 2.5–3.0 kK along the jet. The torch plasma, which is not in thermal equilibrium, drastically influences the working gas and the surrounding air.
Journal of Physics D: Applied Physics, 1996
ABSTRACT
Russian Microelectronics, 2012
ABSTRACT Investigations of nanoscale silicon powders obtained by plasma chemical synthesis in var... more ABSTRACT Investigations of nanoscale silicon powders obtained by plasma chemical synthesis in various process parameters were carried out by transmission electron microscopy, X-ray photoelectron spectroscopy, and infrared (IR) spectroscopy. It was demonstrated that the powders consist of spherical particles with an average diameter from 20 to 30 nm. Each particle includes a single-crystal silicon core and amorphous shell whose chemical composition is defined by bonds of silicon with oxygen and hydrogen. The measurements of photoluminescence (FL) show the presence of dim near-infrared FL in the specimen powders, and more intensive emission around 420 nm in the suspension of the powder in ethanol. The character of this emission has not been determined yet.
Instruments and Experimental Techniques, 2006
ABSTRACT
41st Aerospace Sciences Meeting and Exhibit, 2003
2008 IEEE 35th International Conference on Plasma Science, 2008
Physical principles underlying the operation of a pulsed coaxial microwave plasma source (micro w... more Physical principles underlying the operation of a pulsed coaxial microwave plasma source (micro wave plasmatron) are considered. The design and parameters of the device are described, and results of exper imental studies of the characteristics of the generated plasma are presented. The possibility of application of this type of plasmatron in gas discharge physics is discussed.
Progress in Flight Physics – Volume 7, 2015
Journal of Physics D: Applied Physics, 2014
Instability waves in the shear layer of turbulent jets are known to be a significant source of je... more Instability waves in the shear layer of turbulent jets are known to be a significant source of jet noise, which makes their suppression important for the aviation industry. In this study we apply plasma actuators in order to control instability waves in the shear layer of a turbulent air jet at atmospheric pressure. Three types of plasma actuators are studied: high-frequency dielectric barrier discharge, slipping surface discharge, and surface barrier corona discharge. Particle image velocimetry measurements of the shear layer demonstrate that the plasma actuators have control authority over instability waves and effectively suppress the instability waves artificially generated in the shear layer. It makes these actuators promising for application in active control systems for jet noise mitigation.
Journal of Atomic and Molecular Physics, 2013
Multispark discharge excited in water is described, and its useful physical and chemical properti... more Multispark discharge excited in water is described, and its useful physical and chemical properties are discussed in the light of some environmental issues. Discharge of such a type generates hot and dense plasmoids producing intense biologically active UV radiation and chemically active radicals, atoms, and molecules. Simultaneously, discharge creates strong hydrodynamic perturbations and cavitation bubbles. Particular attention is given to factors influencing on water purity with special reference to discharge application for effective sterilization of water and its cleaning of harmful chemicals. The gas discharges of this type show considerable promise as a means for solving some actual plasma-chemical problems. The above-mentioned discharge properties have been demonstrated in a series of laboratory experiments, which proved the efficiency of disinfection of potable and waste water, water cleaning of pesticide (herbicide) contaminations, and conversion (recovery) of natural methane.
Journal of water and health, 2004
The aim of this work was to investigate the effectiveness of a high voltage multi-spark electric ... more The aim of this work was to investigate the effectiveness of a high voltage multi-spark electric discharge, with pulse energy of 1 Joule, in killing microorganisms in wastewater. Wastewater from primary treated effluent arising from domestic and industrial sources was abstracted for continuous pulsed discharge disinfection. The wastewater contained a large mixed population of microorganisms (approximately 10(7) CFU ml(-1) [10(9) CFU 100 ml(-1)] total aerobic heterotrophic bacteria) including vegetative cells and spores. The electrical conductivity of the wastewater ranged from 900-1400 microS cm(-1) and it was shown that a specific energy of 1.25-1.5 J cm(-3) was required to achieve 1 log reduction in bacterial (faecal coliforms/total aerobic heterotrophs) content. This is higher than that previously shown to reduce the population of E. coli in tap water of low conductivity, demonstrating the role of total wastewater constituents, including dissolved and particulate substances, wate...