Showing papers by "Moscow Institute of Physics and Technology published in 1992"
01 Jan 1992
TL;DR: In this paper, the authors discuss the difference in the nature and the thermodynamic role of background in the OCP model and show that the difference may be in the additional short-range interaction and in the type of statistics.
Abstract: The well-known simplest plasma model One-Component Plasma (OCP) is the system of free moving charges of the same sign in the uniform compensating background of opposite sign. This model is studied carefully nowadays [1÷3]. It should be emphasized that this model is not the single one but it is the family of models in fact. The difference may be in the additional short-range interaction and in the type of statistics, but the main subject for the following discussion is the difference in the nature and the thermodynamic role of background.
10 citations
9 citations
TL;DR: In this paper, the problem of light extinction in a medium consisting of correlated nonresonant electrical dipoles is considered and the recurrent scattering correction is calculated for the extinction coefficient.
8 citations
31 Dec 1992
TL;DR: In this article, the authors proposed an analytical solution of the vector equation for radiative transfer in the small angle approximation for monostatic underwater viewing system, which is based on an analytical solutions of the Vector Equation for Radiative Transfer in the Small Angle approximation.
Abstract: Limits of the polarization technique in discriminating backscattered noise for a monostatic underwater viewing system are discussed. The approach presented is based on an analytical solution of the vector equation for radiative transfer in the small angle approximation. The influence of the water optical properties, the receiver range gate, and the field of view on the background reduction are investigated. Estimates are made of the enhancement of the target's apparent contrast and of the detection range that can be achieved for typical environmental conditions.© (1992) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.
6 citations
TL;DR: In this article, the authors discuss the true separation anxiety of plutonium and discuss the effects of separation anxiety on nuclear power plants, including nuclear power plant shutdowns and nuclear power stations.
Abstract: (1992). Plutonium: True Separation Anxiety. Bulletin of the Atomic Scientists: Vol. 48, No. 9, pp. 28-34.
5 citations
TL;DR: In this article, the bimolecular rate constant of the NF3 decomposition reaction essentially depends upon pressure, and an empirical formula was obtained from the experimental data which correctly expressed the dependence of the measured rate constant upon the temperature and pressure of the reacting mixture behind the shock wave.
4 citations
TL;DR: The rate constant of the NF 3 dissociation reaction in a helium mixture in the low pressure limit was directly measured in a shock tube by a UV absorption method as discussed by the authors, where the rate constant may be expressed as K = 10 14.38±0.07 exp{−[36600±2100 (cal/mol)]/ RT } cm 3 /mol s in the temperature range 1050 −1600 K.
3 citations
TL;DR: In this paper, a kinetic scheme of processes including the formation and quenching of electronically and vibrationally excited particles is proposed for the shock layer adjacent to the surface of a body flying at hypersonic speed.
Abstract: A kinetic scheme of processes including the formation and quenching of electronically and vibrationally excited particles is proposed for the shock layer adjacent to the surface of a body flying at hypersonic speed. We present results of a numerical calculations for the stagnation point obtained under the thin viscous shock layer approximation for space shuttle flight conditions.
3 citations
08 Dec 1992
TL;DR: In this article, a numerical code has been developed to calculate Stokes parameters of the visible solar radiation, scattered in the atmosphere-ocean system, and the optimum viewing directions in such polarization passive remote sensing technique are discussed.
Abstract: A numerical code has been developed to calculate Stokes parameters of the visible solar radiation, scattered in the atmosphere-ocean system. Mathematical modeling is used to examine spectral and angular (azimuth and zenith angle) variations of degree of polarization at sea level and at different heights in the atmosphere above the sea surface. On the basis of a developed computer code the efficiency of the polarization measurements for different optical passive remote sensing techniques of the ocean has been investigated. For the passive spectral measurements of the water bio-productivity (chlorophyll-a, dissolved organic matter, concentration of suspended particles) the polarizer can improve signal-to-background ratio. The magnitude of this effect and optimum direction of the polarizer depend upon height, viewing direction, and solar zenith angle. Within the framework of polarization remote sensing technique the influence of the observation height and viewing direction on the results of water turbidity measurements is investigated. Optimal viewing directions in such polarization passive remote sensing technique are discussed.
3 citations
[...]
TL;DR: The Born-Oppenheimer parameter as mentioned in this paper is a parameter that measures the degree of degeneracy of a vibrational oscillator in a three-dimensional oscillator, and it can be used to remove degeneracy.
Abstract: The Born-Oppenheimer parameter. Hierarchy of spectra. Normal vibrations. Anharmonicity. Rotations. K-degeneracy, hyperfine splitting. Vibrational-rotational interactions. Three-dimensional oscillator, anharmonic removal of degeneracy. The Coriolis splitting. Hybrid states. The Fermi resonance. Dipole transitions. IR-active modes. Rotational selection rules. P-, Q- and R-branches. Hot bands. Stochastization of vibrations.
2 citations
TL;DR: In this paper, a model for B-diffusion in polysilicon-silicon structures is presented which allows for grain boundary motion, segregation of impurity-to-grain boundaries, different diffusivities in grain and grain boundaries, and influence of interfacial oxide layer thickness on the 2-D diffusion profile.
Abstract: A model for B-diffusion in polysilicon-silicon structures is presented which allows for grain boundary motion, segregation of impurity-to-grain boundaries, different diffusivities in grain-and-grain boundaries, and influence of interfacial oxide layer thickness on the 2-D diffusion profile. The derivation of the model equations for cubic and column-like grains is discussed.
TL;DR: In this article, the Lagrangian-averaging (Whitham's) technique is used to investigate the interaction of a quasi one-dimensional soliton of the Kadomtsev-Petviashvili (KP-II) equation with a moving local dipole, described by an additional term in the equation, and the main result of the interaction is the generation of left and right-going flexural waves on the crest of the soliton.
01 Apr 1992
01 Jan 1992
TL;DR: In this article, a method of separate species concentration flow-field imaging in high enthalpy gas flows has been developed based on instantaneous volume uniform excitation of the gas by nanosecond gas discharge with subsequent radiation spatial distribution recording.
Abstract: A method of separate species concentration flow-field imaging in the high enthalpy gas flows have been developed. The method is based on instantaneous volume uniform excitation of the gas by nanosecond gas discharge with subsequent radiation spatial distribution recording- An experimental facilities consist of a shock tube with a discharge section for flow area 80x1200 cm x cm imaging. The investigations of nonequilibrium chemical kinetics behind incident shock wave in nitrogen, oxygen and air and in associated flow field of a solid body in hypersonic flow of these gases have been performed.
01 Jan 1992
TL;DR: In this paper, nonequilibrium plasma created by high energy sources is used as an instrument for plasma-chemical reactions by external energy sources such as electron, ion, and neutral beams, laser radiation or high electric field, X-ray or gamma-radiation.
Abstract: Nonequilibrium plasma, created by high energy sources is very effective instrument for plasma-chemical reactions By external energy sources it means electron, ion, and neutral beams, laser radiation or high electric field, X-ray or gamma-radiation
01 Jan 1992
TL;DR: In this paper, the broadband CARS technique is used to obtain an evolution of the vibrational distribution function of N 2 in the process of thermal dissociation of nitrogen-dioxide behind a reflected shock wave.
Abstract: Coherent anti-Stokes Raman spectroscopy is a powerful diagnostic tool in hostile environments when measurements of temperature and species concentration are required, and when traditional methods for some reason cannot be applied. Such conditions occur in those non-stationary gas-phase chemical reactions in which nitrogen plays a significant role. In this case, CARS provides information about the most important parameters of the process with a sufficient temporal and spatial resolution. In our experiments, the broadband CARS technique is used to obtain an evolution of the vibrational distribution function of N 2 in the process of thermal dissociation of nitrogen-dioxide behind a reflected shock wave.