2005. № 20

The mathematical model of aerodynamic characteristics with inclusion of the non-stationary components corresponding to structure of a flow and), in nonlinear and linear representation is considered. It is explained cosinusoidal dependence rotary and also linear non-stationary derivative of a corner of attack. New approximations of functions are offered: (with the parameter dependent on centering of the plane) and (with, having two rough local minima). Communication expressions with derivatives, calculated of complexes, experimentally measured in wind tunnels is determined. The technique of a choice of parameters of dynamic making aerodynamic characteristics for modeling is resulted.

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In work research of a design of the stabilizer of horizontal plumage longeron, caisson and monoblock constructive - power circuit is lead at various kinds of fastening of plumage (console, four-dot, three-dot) on a fuselage and on Kiel, local airlines used in civil transport planes. Research was carried out in system NASTRAN for windows. The task will consist in definition of a picture of distribution of efforts and pressure in elements of an irregular zone of a design of the stabilizer.

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A reflection of a circularly polarized electromagnetic plane wave and a transmission of the spin of the wave to the reflector are considered. An expressions for a classical electrodynamics spin tensor and for the torque are used.

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A defect of the standard classical electrodynamics is the theory does not know spin. The spin tensor of the classical electrodynamics is zero. The absence of spin in the theory implies an absurd corollary: a circularly polarized plane wave has no angular momentum at all in direct contradiction to quantum theory. An orbital angular momentum of a circularly polarized beam without an azimuth phase structure is erroneously recognized as spin. An expression for electrodynamics' spin tensor is presented.

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Static electric field in linear uniform neutral dielectric is divergence-free and irrotational. Thus the Maxwell stress tensor is divergence-free as well. So, according to Maxwell, the volume force is ZERO. Only surface forces act on the polarized dielectric. Nevertheless the result contradicts textbook [5]

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The canonical spin tensor of the standard electrodynamics is inadequate. This is shown by the use of a plane electromagnetic wave and a standing electromagnetic wave as examples. An improvement of the tensor by adding of a magnetic term is considered. The true spin tensor is demonstrated.

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Problems of mathematical modeling of blood flow in large vessels are considered. A second order spatial and time discretization SSP-TVD-scheme is implemented for the hemodynamics problem. A number of test problems with analytical solutions are proposed. In particular, a solution for Riemann problem is given. Various features of boundary conditions implementation for the system of hemodynamics equations are discussed. Questions of convergence and a choice of grid parameters for various schemes are investigated.

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For needs of modern accelerated paces of technological progress the dynamics of designing of complicated objects, such as the airplane, containing 106-108 parts, is one from major of its performances, both the reduction of terms and cost of designing becomes from main requests. The use of modern computer aided design systems changes both means and methods of a solution of design problems. For deriving an optimum outcome in designing the use of a number of functionalities of one or several existing application systems and in addition developed specialized modules if necessary. The article presents substantiation both choice of methods and technology of data exchange with computer aided design systems.

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One of the major problems constantly solved during functioning of systems of differential navigation, the problem of precision forecasting of trajectories of navigating satellites is. The more exact is such forecasting, the expenses for operation of system will be smaller. In clause aspects of use of achievements of the modern theory of movement of the center of weights of artificial satellites of the Earth to forecasting movement of navigating satellites are considered.

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In work on the basis of the diagrams of a condition of electrode components the analysis of electrochemical condition of cells a HIT with electro casts, formed is carried out (spent) during chemical reaction between electrodes components.

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In work on the basis of the diagrams of a condition of electrode components the analysis of electrochemical condition of cells a HIT with electro casts, formed is carried out (spent) during chemical reaction between electrodes components.

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After a detailed study of present day incubators, it was found that most of them do not perform well when operating in tropical climates. Therefore the authors propose a change in the design of incubators. As a result, perfect hatching performance is achieved. Thermal computations of such incubators are drawn here too.

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The performance of industrial incubators is characterized by its hatching performance shown in different countries with different climates. Generally incubators suitable for cold climates are used in countries with tropical climates where the temperature rises up to 450C. In this paper thermal computations are performed for multistage industrial incubators (6 stage and 9 stage) with different boundary conditions in accordance to the expected temperatures in a variety of climates. The results of these computations are drawn here too.

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Modern poultry is technology based and industrial incubators with a hatching capacity of tens of thousand eggs are utilized. The microclimate found inside incubators is a result of CO2 (carbon dioxide) production, O2 (oxygen) consumption and heat dissipation by the eggs during the incubation period. In order to maintain suitable microclimatic conditions required for high hatching and post hatching performance, it is imperative to keep the incubation temperature at optimal levels, which is 37 to 38 0C for most poultry species. In this paper a set of mathematical models is proposed for the heat flow in industrial incubators with a horizontal ventilation scheme. A numerical method solving these equations is also provided here with test results.

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