2000. № 2

The problem of motion of an electron with a spin in a field of a flat electromagnetic wave surveyed within the framework of a pseudo-classical mechanics. The solution of a problem, as for spin, and space coordinates is obtained.

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The problem of motion of an electron with a spin in a Coulombian field surveyed within the framework of a pseudo-classical mechanics. The physical estimation of motion of an electron with a spin in indicated a field is given, the precise analytical solution on a spin of an electron for the elementary case of motion is obtained, the problem of Tomas precession is researched.

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The canonical energy-momentum tensor of electrodynamics is obviously wrong. One cannot use an invariance of a Lagrangian to derive true energy-momentum and spin tensors.

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Does mass depend on velocity? Is mass additive when bodies are joined? Is mass of an isolated system conserved? Sundry physics teachers and experts answer these questions differently because of disagreements on a definition of mass. We show that it is more rational to prefer relativistic mass dependent on velocity to rest mass.

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A photon has no proper mass-energy and frequency. ts frequency is indicated twice: when it is radiated and when it is absorbed. The measurements are coincided if and only if the radiator and the absorber do not have velocity with respect to the photon worldline. Because of it red shift, gravitational and cosmological, is a Doppler effect.

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The problem about composite loading of a thin-wall design of the open structure(profile), asymmetrical on geometrical and stiffness to the characteristics is reviewed. Adopted in this work the computational scheme is lower the solution allows to refuse a hypothesis about absence of shift in a middle surface adopted V.Z. Vlasov [2]. As in reduced activity the system of authorizing equations is constructed, which one has some differences from known equations of V.Z. Vlasov a rule (situation,position) of a point also is determined, concerning which one there is a turn of cross-section, and which one in the given activity and is hereinafter called as center of rotation.

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The possibilities of the simplification of the solar thermal propulsion creation, and the possibilities of the simplification of the solar concentrator orientation conditions are considered. In such engine the solar radiation absorber and the thermal energy storage carried out jointly as the unified system, and contains lithium hydride as heat accumulating substance. The solar radiation absorbing surface of this system created from the material with real spectral-selective properties. The heating temperature of such surface can corresponds to the lithium hydride melting temperature. The required accuracy of the solar concentrator can be reduced, therefore the permissible angle of concentrator-absorber system disorientation from the direction to the Sun can be increased.

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This article concerns a soft landing systems for a touching down object. Air bags are widely used in a soft landing system. The subject of the article are the investigation of the influence of air bags parameters on deceleration process, this process mathematical model creation. The authors propose the air bag design improvement by internal breakable element, with ties up the air bag initial volume.

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This activity presents the algorithm of an optimal filter for a case, when the input effects and the noises are random Gaussian processes, which are different from white noise. As against known algorithms no nonlinear vector-matrix differential equations for the errors of filter correlation matrix definition are decided. The presented algorithm does not contain traditionally used shaping filters also. All specified above reduces a volume of computing operations at its use in hardware systems.

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The algorithm of creating a rational set of restored plants of historical heritage with one or several resources limitations is defined in the article. The article also contains examples of problems solving for creation a rational set of plants with different limitations.

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The article describes the developed conceptual information model adequately circumscribing structure of data in management system for the process of saving and restoring of historical heritage. The information model provides sufficiency and reliability of the information.

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The article considers criteria of efficiency estimation for the rational set of plants of historical heritage as subject of restoration and restoring in the defined periods with restricted resources from all of their set.

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The article describes the information system is intended to provide a essential search possibilities for the specialists which are deal with saving of historical heritage. The brief performance of its subsystems, type of search requests and schemes of their implementation is given.

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