-

Gasdynamics and Magnetohydrodynamics of the Interplanetary and Interstellar Gas Interaction. Theory and Experiments

Authors: Baranov V. B.

A problem of the interaction between interplanetary and interstellar gas flows is the problem of the interaction between the supersonic flow of the fully ionized hydrogen gas flow from a source (solar wind) and the supersonic translational flow of the interstellar gas which has neutral (Hatoms) and plasma (electrons and protons) components. Self-consistent, kinetic-continual model of this interaction, suggested in [8], is described in this paper.

Three-Dimensional Problem of Perfect Plasticity (Kinematic Equations Determining Three-Dimensional Plastic Flow for a Facet and Edge of the Tresca Prism)

Authors: Radaev Y. N.

In the present study a system of partial differential equations which describes kinematic of three-dimensional plastic flow for the states corresponding to an edge of the Tresca prism is obtained. The system includes the Cauchy equations and the compatibility equations formulated for the displacements and strains increments. These equations are then analysed by the aid of the triorthogonal isostatic coordinate net. The system of kinematic equations is shown correctly determines displacements increments and be of the hyperbolic type.

Approximative Properties of Mixed Series by Lagerre’s Polynomials on Classes of Smooth Functions

Authors: Pirmetova S. Y.

Approximative properties of mixed series by Lagerre’s polynomials on classes of smooth functions that given on axle [0, ∞) are viewed. Inequality that corresponds to Lebesgue inequality for trigonometric Fourier sums was found for evaluation of deflection of smooth function from it’s partial sums of mixed series by Lagerre’s polynomials. Evaluations for corresponding Lebesgue function of partial sums of mixed series by Lagerre’s polynomials were found.

On One Algorithm for Finding of a Mask of Diagnostic Information

Authors: Mironov S. V.

This paper describes an approach to reduction of a diagnostic information with a help of masks. The new algorithm for finding of a mask is proposed. The algorithm has appropriate time characteristics and small memory requirements. The experimental results show an effectiveness of proposed algorithm on fault dictionaries of circuits in ISCAS’89 benchmark set.

Asymptotic Methods in Dynamics of Shells under Shock Loading

Authors: Kossovich L. Y.

The paper deals with the asymptotic methods, developed for creating a mathematic model of non-stationary wave propagation in shells of revolution under shock impacts of tangential, bending types and shock impacts of normal type; the methods are also aimed at solving the boundary value problems for the strain-stress state (SSS) components with different values of variability and dynamicity indices. Classification of asymptotic approximations is also presented. This classification defines three different types of separation scheme of non-stationary SSS.

Investigation of the Isotropic Plates Bending Lying on the Complex Two-parameter Elastic Foundation by Boundary Element Method

Authors: Velikanov P. G.

This work is dedicated to the investigation of the linear deformation problem of plates based on application of the fundamental decision of task of the isotropic plate bending lying on the complex two-parameter elastic foundation by an indirect method of boundary elements. In the issue of resolving system analysis was indicated that the task of isotropic plate bending lying on the simple elastic foundation is a special case of the task declared in the title of the article.

The Construction of Supervisory Test with the Use of the Genetic Algorithm

Authors: Ukolova E. V.

The article describes a control test generation method for discrete devices based on the genetic algorithm. The method operability and effectiveness have been checked by means of creating tests for circuits listed in the ISCAS’ 89 catalogue. The C++( Visual Studio 2005) program has been implemented in order to simulate circuit and generate tests. Faults are simulated by programmatically setting an appropriate object in storage to a special state, in which it acts as a faulty component.

Synthesis of Pseudorandom Test Patterns for the Discrete Device

Authors: Ukolov I. V.

In article the pseudorandom method of test patterns generation for discrete devices applicable for both to combinational devices and to sequential devices is considered. The entropy approach for search of optimum distribution of probabilities of input vectors is used that allows reducing average length of generated tests. For definition of the mentioned probabilities the multivariate problem of search of a maximum of output entropy with application of genetic algorithm is solved.

Methods and Algorithms of Identification of External Heat Exchange Parameters for Heat and Mass Tranfer Processes

Authors: Tkachenko V. N., Ivanova A. A., Shuba O. V.

The methods and algorithms of identification of external heat exchange parameters based on least square method are proposed. The comparative analysis of distributerd parameters identification methods is performed.

On Inverse Nodal and Spectral Problems for Boundary Value Problems with Discontinuity Conditions Inside the Interval

Authors: Yurko V. A.

The solution of inverse nodal and inverse spectral problems is presented for second-order differential operators on a finite interval with discontinuity conditions inside the interval. Connections between these two classes of inverse problems are established.

Pages