ON THE EMISSION PROCESSES IN NONEQUILIBRIUM MEDIA

V.M.Kuklin

Full Text :   (650 kB, Rus.) 

Abstract
Using extended definition of spontaneous and induced processes in electrodynamics some well-known problems in plasma physics in corresponding terms is reformulated. The processes of spontaneous and induced radiation in classic electrodynamics can be reformulated by using quantum analogy and can be expressed through coefficients and equations that have direct analogy in quantum electrodynamics. It is shown that spontaneous and induced radiation has deep relation in both these cases despite different nature of these phenomena. It is discussed the main features of superradiation (superfluorescence), which is possessed the characteristics of the spontaneous and induced processes. It is considered in detail two types of sources of the spontaneous radiation: particles (the beam-plasma interaction) and currents (three-wave interaction of ion-sonic waves) and obtained the intensity for spontaneous and induced radiations in both case. It is shown specifically that oscillation generated by nonlinear current at combined frequencies demonstrated the characteristics of the spontaneous and induced emissions.

KEY WORDS: spontaneous and induced radiation, superradiation, beam-plasma interaction, three-wave interaction.

ANALOG INTERACTION LAGRANGIAN FOR THE EM PROCESSES OF SPLITTING THE NONLOCAL FIELDS

A.V. Babich, Yu.A. Kasatkin, I.K. Kirichenko, A.P. Korzh

А.В. Бабич, Ю.А. Касаткин, И.К. Кириченко, А.П. Корж

Full Text :   (530 kB, Rus.) 

Abstract
Based on the principle of universality of the interaction of photons with charged matter field, supplemented by the concept of property of inseparability of charge from the concept of mass, as well as the properties of indifference EM interactions an expression for the gauge-closed amplitudes of the nonlocal field split into fragments are obtained. We discuss the possibility of constructing the interaction Lagrangian of the EM field with a nonlocal field and its disintegrating into fragments, in accordance with the requirement of universality. Revealed the physical meaning of the regular part of the amplitude as a measure of non-locality bound state. Some proposals of experimental measurements to determine the role of a regular part of the amplitude in the process of disintegrating are formulated.

KEY WORDS: local and nonlocal fields, electromagnetic interaction, the interaction Lagrangian, gauge invariance, the measure of non-locality, bound states.

COULOMB SUM OF ¹²С NUCLEUS AT TRANSFERRED MOMENTUM 0.95÷1.35 FM^-1

A.Yu. Buki

Full Text :   (770 kB, Rus.) 

Abstract
The experimental values of the Coulomb sum ¹²C in the range of momentum transfers 0.95÷1.35 fm^-1 were obtained. The results of measurements have been compared with the calculation of the Coulomb sum of this nucleus, fulfilled in the harmonic oscillator model with accounting of Pauli correlations. This calculation is consistent with the experimental data. Are discussed the possibility of experimental verification of the calculation of proton-proton short-range correlations in the region of small momentum transfers.

KEY WORDS: electron scattering, atomic nuclei, coulomb sum, proton-proton correlation, nucleus of ¹²С.

MOLECULAR DYNAMIC WITH QUANTUM STATICTICS FOR INVESTIGATION OF DYNAMIC PROPERTIES OF METALS

I.G. Marchenko, I.I. Marchenko

Full Text :   (560 kB, Rus.) 

Abstract
The paper presents the description of a physical basis for investigations into properties of materials submitting to the quantum statistics. The heat capacity of copper layers in the material volume and on its surface is studied. It is shown that, unlike the classical molecular dynamics, the proposed method describes correctly a heat capacity behavior at low temperatures. The temperature dependence of an average squared deviation of atoms on the (100) surface is calculated. The results obtained are in a good agreement with available experimental data.

KEY WORDS: computer simulatin, quantum statistics, molecular dynamic, heat capacity, phonons.

DEFINITION OF RELATIVE SCINTILLATION DETECTOR LIGHT YIELDS WITH THE USAGE OF VACUUM AND SOLID-STATE PHOTO RECEIVERS

O.V. Dudnik, E.V. Kurbatov, V.A. Tarasov, L.A. Andryushenko, E. Valtonen

Full Text :  

Abstract
Spectrometric and noise properties of the system scintillation detector?photo receiver?shaping amplifier?spectrometric analog-to-digital converter with a usage of radio active isotope ¹³⁷Cs are investigated. Small-sized scintillation detectors of cubic form are manufactured on the base of stilbene, paraterphenyl and cesium iodide doped with thallium crystals, and plastic scintillator created on the base of polystyrene. Photo receivers were vacuum and solid-state photo electronic amplifiers, and silicon p-i-n photodiode of «Hamamatsu Photonics» firm.

KEY WORDS: scintillation detector, photo receiver, photo electronic amplifier, radioactive isotope, light yield, shaping amplifier

DUSTY PLASMA IN AFTERGLOW REGIME

I.B. Denysenko, G.P. Burmaka, N.A. Azarenkov

Abstract
Full Text :   (360 kB, Ukr.) 

A zero dimensional, space averaged model for argon dusty plasma afterglows is developed. Using the model, the electron density and temperature, and the density of atoms, which are in metastable excited states, are studied. The model accounts for electron production in electron-neutral collisions, in collisions of metastable atoms with other metastable atoms, and in the secondary emission process caused by interaction of ions with dust particles of submicron size. The calculated electron densities are compared with those obtained in experiments. A good agreement of theoretical results with experimental data is obtained.

KEY WORDS: dusty plasma, afterglow regime, generation and losses of particles.

THE SURFACE ELECTROMAGNETIC EFFECTS IN SPACE – INHOMOGENEOUS STRUCTURES

V.G. Kirichenko, V.I. Tkachenko

Full Text :   (905 kB, Rus.) 

Abstract
The results of investigation of electrical potentials and currents formation processes on the many sharp edges surface of inhomogeneous biological structures which may be use as biotemplates are presented. The charge carrying is characterized by dependence from applied high voltage potential and magnetic field. Possibly observed dependences of induced potentials and currents are connected with formation features of biological object's structures and they are determined their characteristics and effectiveness of functionating. The topological features of space - inhomogeneous structures of surface wings may be lead to the appearance of weak electromagnetic fields which interact with magnetic field of Earth.

KEY WORDS: electrical conductance, biotemplates, surface, inhomogeneity, electrical and magnetic field

STUDY OF POLYIMIDE ELECTRICAL RESISTANCE VS ION BEAM FLUENCE AT IRRADIATION BY IONS OF NITROGEN

V. N. Bondarenko, A. V. Goncharov, V. V. Kuz’menko, V. I. Sukhostavets

Full Text :   (340 kB, Rus.) 

Abstract
Dependences of the irradiated polyimide electrical resistance on nitrogen ion fluence (energies of 0.75 and 1.5 MeV) have been measured at fluences of 5⋅10¹³-2⋅10¹⁵ ion/cm². Treatment of these dependences shows that they describe well by power low, which is typical for initial irradiation stage. The conductivity of irradiated layers grows with the nitrogen ion energy enhancement that agrees with previously published experimental data and theory.

KEY WORDS: polyimide, electrical conductivity, irradiation, fluence, N+ ions.

EVOLUTION OF FLUCTUATION CONDUCTIVITY OF Y_1-ZPR_ZBA₂CU₃O_7-δ SINGLE CRYSTALS IN PROCESS OF GROWTH OF PRASEODYMIUM CONTENT

A.A. Zavgorodny, R.V. Vovk, Z.F. Nazyrov, M.A. Obolenskii, E.I. Ivry

Full Text :   (703 kB, Ukr.) 

Abstract
In present work effect of praseodymium doping on conductivity in a basic plane of HTSC Y_1-zPr_zBa₂Cu₃O_7-δ single crystals are investigated. It is established, that exess conductivity Δσ(Т) of Y_1-zPr_zBa₂Cu₃O_7-δ single crystals satisfactory described by Aslamazov-Larkin theoretical model. Absolute values of cross-section coherent length ξ_с(0) increase in process of an increase of a praseodymium content. At the same time for samples with z≥0.48 sharp enough decrease in size ξ_с(0) that is maybe connected with the general suppression of superconducting characteristics at an increase of praseodymium concentration up to z≈0.5 is observed.

KEY WORDS: exess conductivity, doping, YВaCuO single crystals, high-temperature superconductivity, coherent length.

INFLUENCE OF THE EXPOSURE ON STRUCTURE OF THE SURFACE LAYERS OF STEEL X18H10T

V.G. Kirichenko, V.N. Leonov

Full Text :   (950 kB, Rus.) 

Abstract
Results of examination structurally-phase transformations in austenitic steel Х18Н10Т after complex thermomechanical treatment and an exposure are presented. The exposure result ins to density change of dislocations and acceleration of process of the reverse transformation α→γ into thin surface layer of a steel. Influence of electronic structure of components alloying a steel on processes thermal and radiation embrittlement is considered.

KEY WORDS: alloys, radiation, segregation, electronic structure, isomeric shift.

THREE MODES OF THE SHEAR-FLOW-DRIVEN ION CYCLOTRON INSTABILITY

D.V. Chibisov, V.S. Mikhailenko, K.N. Stepanov

Full Text :   (1300 kB, Eng.) 

Abstract
The electrostatic shear-flow-driven ion cyclotron instability of magnetic field aligned sheared plasma flow is investigated analytically. It is shown that the shear-flow-driven electrostatic ion cyclotron instability can be considered as a combination of three different instabilities determined by theirs own mechanism of excitation: ion-kinetic, ion-hydrodynamic and electron-kinetic. Each of these instabilities is dominant in different ranges of the wavelength along the magnetic field. The linearized dispersion equation is solved within the limits of long and short waves along the magnetic field, where effects of electrons and ions, respectively, are dominant in the development of these instabilities. The general criterion of instability excitation, which couples the flow velocity shear and wave number across the magnetic field, is obtained.

KEY WORDS: magnetic field aligned plasma shear flow, shear-flow-driven ion cyclotron instability, auroral magnetosphere.