Alexander E. Dubinov

Solitary electrostatic waves are possible in unmagnetized symmetric pair plasmas

A possibility of stationary solitary electrostatic waves with large amplitude in symmetric unmagnetized symmetric pair plasmas (e−e+ plasma, C60−C60+ plasma or e−h+ plasma) is proven. The main idea of the work is a thermodynamic unequilibrium of plasma species which may be created in low-density ideal pair plasmas. Ranges of parameters (Mach number M and a nonequilibrium degree τ=T+∕T−) which lead to the possibility of solitary waves are found.

Glow discharge based device for solving mazes

A glow discharge based device for solving mazes has been designed and tested. The device consists of a gas discharge chamber and maze-transformer of radial-azimuth type. It allows changing of the maze pattern in a short period of time (within several minutes). The device has been tested with low pressure air. Once switched on, a glow discharge has been shown to find the shortest way through the maze from the very first attempt, even if there is a section with potential barrier for electrons on the way. It has been found that ionization waves (striations) can be excited in the maze along the length of the plasma channel. The dependancy of discharge voltage on the length of the optimal path through the maze has been measured. A reduction in discharge voltage with one or two potential barriers present has been found and explained. The dependency of the magnitude of discharge ignition voltage on the length of the optimal path through the maze has been measured. The reduction of the ignition voltage with the presence of one or two potential barriers has been observed and explained.

Non-linear Langmuir waves in a warm quantum plasma

A non-linear differential equation describing the Langmuir waves in a warm quantum electron-ion plasma has been derived. Its numerical solutions of the equation show that ordinary electronic oscillations, similar to the classical oscillations, occur along with small-scale quantum Langmuir oscillations induced by the Bohm quantum force.

Generation of Nanosecond Spark Microdischarges Along the Surface of Wings of Flying Insects

A device generating spark nanosecond discharges is presented, and the effects produced by the same, which were observable on the surface of wings of flying insects, such as flies, bees, mosquitoes, and butterflies are reported for the first time. It is shown that the series of discharges having <;0.5-mJ energy per each pulse in a sequence of 0.2 Hz produces damages on the wing surface, varying from rupture of the upper wing layer or rolling of the same in case of a fly or a mosquito, to exfoliation of the wing by the shock wave produced by the discharge in case of a butterfly.

Beam-plasma instability in charged plasma in the absence of ions

In the present work we have studied the novel nonlinear phenomenon of plasma physics - beam-plasma instability in a charged plasma in the absence of ions. We have shown the possibility of the instability development and analyzed the characteristics of physical processes taking place during the beam-plasma interaction.

Simple Device to Study Influence of Nanosecond Surface Microdischarge Plasma on Biomaterials

This paper presents the development and description of research aimed at investigation of nanosecond surface microdischarge plasma effect on biomaterials. The technique is based on application of a simple discharge device. The device is assembled on a standard microscope slide from inexpensive materials. An optical microscope equipped with a digital camera is used for visualization of the studied samples and microdischarges. Many images of the microdischarges on the biological objects are presented in this paper. Spatial resolution of the images allows studying the discharges along the cellular structure of the tissue.

New solutions of the Zakharov's equation system for quantum plasmas in form of nonlinear bursts lattice

New multiplicative solutions of the Zakharovs quantum system of equations using the separation of variables method are found. The found solutions are interpreted as spatial-periodical lattices of non-linear plasma bursts. It is shown that the bursts could be both symmetrical and asymmetrical by an electric field.

Effect of Plasma and UV Radiation of Multigap Sliding Discharge in Air on Bacteria

The device generating pulsed-periodic multigap sliding discharges in air was used to study the impact of plasma and UV radiation on bacterial test objects, which were prepopulated with bacteria Escherichia coli (Ec) and Staphylococcus aureus (Sa). Bactericidal effect was revealed, which varied depending on period of impact, distance, and exposure time. It is found that Sa bacteria were less resistant to plasma and UV treatments than Ec bacteria.

Backward dust-acoustic waves

This paper studies the peculiarities of Dust-acoustic wave (DAW) propagation in a plasma with a moving dusty flow. As a result of a dispersion relation analysis, it is shown that at definite conditions, the DAWs can exist in the form of backward waves with antiparallel group and phase velocities. The range of the dusty flow velocities is found for the backward DAW realization.

Child-Langmuir Law for a Planar Diode Filled With a Two-Layer Dielectric

We considered the steady states of the electron beam in a planar diode filled with a two-layer dielectric. The exact mathematical formulas describing the distribution of the electrostatic potential and the electron beam current density limited by its own space charge were obtained (Child-Langmuir law for a two-layer diode).