THEORY OF NON-LINEAR STRUCTURES FORMING AT INTERACTION OF POWER LASER RADIATION WITH PLASMA

The work covers the electromagnetic solitons, electron vortices and magnetic islands forming at propagation of the relativistic-strong laser pulse in the cold collisional-free plasma; they are investigated analytically and by means of the numerical modelling by a method of the particles in the cell. The mechanism for excitation of the solitons has been determined. It has been shown that the development of the forced combination scattering leads to the burstes of the reflected electromagnetic radiation and appearence of the accelerated electron beam bunchs moving in the forward and reverse direction. The analytical solution of the one-dimensional euqations for the relativistic unlimited cold electron liquids on the neutralizing background of the fixed ions, being incompatible with use of approximating envelopes has been shown firstly. The instability increments of the single and binary chains of the point vortices within the frames of the electron magnetic hydrodynamics (EMHD) have been obtained firstly. It has been shown that the field of the paremeters at which the stability of the binary chain is possible in case of EMHD is increased in comparison with common hydrodynamics. It has been shown that the development of the braking point layer instability in EMHD leads to the re-closing of the magnetic force lines and displays the tendency to the origin of the large-scale topological special features in the distribution of the generalized vorticity over cross component of the vector-potential.Available from VNTIC / VNTIC - Scientific & Technical Information Centre of RussiaSIGLERURussian Federatio

DIFFERENTIAL CHERENKOV COUNTER FOR INVESTIGATION OF RARE PROCESSES AND ITS USE IN EXPERIMENT ON STUDYING SUB-THRESHOLD GENERATION OF K*99+-MESONS

The sub-threshold formation spectra of the K*99+-mesons by the protons on the Be and Co nuclei have been measured. The instructions to the direct generation mechanism of the K-mesons have been obtained. The differential Cherenkov counter possessing the high efficiency in recording of the particles and high coefficient of the background rejection has been constructed. The sub-threshold formation sections of the K*99+-mesons have been measured. The investigation results are used for testing sub-threshold formation of the hadrons in the proton-nuclear reactions.Available from VNTIC / VNTIC - Scientific & Technical Information Centre of RussiaSIGLERURussian Federatio

INVESTIGATION OF UREA AND TETRAMETHYL UREA HYDRATION BY COMPUTER MODELING METHODS

The aim is to investigate the hydration of the urea and its alkal derivative - tetramethyl urea on the molecular level and to reveal the hydration mechanisms. The new algorithm for design has been created, and the new information about energetical and dynamic hydration characteristics of different functional groups in the investigated molecules has been obtained. Firstly, the conception about mobility of the water molecules on the grid of the hydrogen bonds through formation of the bifurcate bonds has been applied for explanation of the influence of the dissolved substance.Available from VNTIC / VNTIC - Scientific & Technical Information Centre of RussiaSIGLERURussian Federatio

NUMERICAL INVESTIGATION OF GAS FLOWS INITIATED BY SUPERSONIC MOVEMENT OF BODIES IN ATMOSPHERE

The flow of the compressible gas is investigated by means of the developed finite-difference computer algorithms. The flow of the viscous gas is modelled on base of the completed and simplified Navier - Stokes equations. The completed equation system of the viscous shock layer for solution of which the effective iteration algorithm has been developed is used as the simplified equations. The axial-symmetric flow-around of the large length cones taking influence of the turbulence, equilibrium and unequilibrium physical-chemical processes and spatial radiation transfer into consideration has been investigated. The influence of the second approximation effects in the theory of boundary at axial-symmetric and spatial flowing-around of the large length bodies has been determined firstly. The task about body flow through the large-scale termic has been formulated firstly and solved. The method for solution of the Euler and Navier - Stokes equation on the solution dynamic-adaptive grids with application of the compact approximations has been developed.Available from VNTIC / VNTIC - Scientific & Technical Information Centre of RussiaSIGLERURussian Federatio

FUNCTIONAL-DIFFERENTIAL EQUATIONS IN HILBERT SPACE AND PROBLEM OF SPECTRAL THEORY CONNECTED WITH THEM

The functional-differential equations (FDE) in the Hilbert space have been studied on base of the spectral analysis of the operator functions generated with these equations. The results about correct decision of the initial-boundary problems in the weighted Sobolev spaces on the semi-axis have been determined for wide class of the functional-differential equations (FDE) in the Hilbert space with unlimited operator coefficients and variable lags. The spectral analysis of the wide class operator beams with exponential occurance of the spectral parameter has been made. The Riesz basicity of the exponential solution system for neutral type FDE in the finite-dimensional space has been proven, and on this the accurate evaluations of the solutions in the critical and supercritical cases have been obtained. Usage field: theory of operator beams, theory of FDE, mathematical theory of control.Available from VNTIC / VNTIC - Scientific & Technical Information Centre of RussiaSIGLERURussian Federatio