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  • Some aspects of design of indoor stadiums

    The need for similar constructions, requirements to their functional equipment and formation the construction answering to inquiries of today locates is proved in this article. The main problem today is a problem of construction of a covering flight of 130-160 m with a possibility of its expansion. Examples from foreign practice and shortcomings of the famous decisions are given. On this basis the new functional configuration including buildings on arena corners to which the main longitudinal bearing covering designs are interfaced is given. The cross elements of a covering forming a basis of the stationary and moved apart parts of a covering lean on the last. Such decision gives the uniform spatial combined design which configuration accords with the principles of concentration of materials and combination of functions of elements.

    Keywords: stadium, the arena, indoor stadium, covering, sliding covering, the bearing design, a connection element, a framework, a column

  • The phase composition and physical properties of high-temperature multiferroic BiFeO3 / Nd

    The investigations of the crystal structure, grain structure and dielectric properties of high-temperature multiferroic Bi1-хNdxFeO3 were carried out over a wide concentration range x = 0.00-0.50.

    Keywords: multiferroic crystal structure, grain structure, dielectric properties

  • Studies of low-temperature multiferroic samarium doped bismuth ferrite

    The investigations of the crystal structure, grain structure and dielectric properties of high-temperature multiferroic Bi1-хSmxFeO3 were carried out over a wide concentration range x = 0.00-0.50.

    Keywords: multiferroic crystal structure, grain structure, dielectric properties

  • Comparative analysis of energy efficient solutions, used in low-rise construction in Russia

    The article examines the main energy-saving technology used in the Russian low-rise building. Represented by the relevance of the topic in terms of increasing energy deficit. Presented and systematized the main indicators of energy-efficient methods used in low-rise construction in Russia. The methods of evaluating the effectiveness of interventions. Comparative analysis of energy efficient solutions. Select the most cost-effective method by comparing the value of the beneficial effects of its use.

    Keywords: energy efficiency, low-rise construction, energy, energy-efficient equipment, alternative sources of energy, the useful effect

  • Technical and economic indicators of the proposed solutions truss reinforced concrete beams with a combined pre-stress

    The article presents the technical and economic indicators previously proposed solutions truss reinforced concrete beams with combined prestressing. Reducing consumption of concrete and steel in comparison with typical. This reduces the weight of the beams and money. Significant economic effect is achieved by the use of roof beams t profile with a shelf in the stretched area. This effect is achieved due to a significant reduction of the structural height of the coating (beams and slabs). By reducing the volume of the brick walls of the building, which is based on the overlap, the cost of masonry with single-span building, as noted above, reduced by 33% in comparison with a standard solution.

    Keywords: truss reinforced concrete beam, combo-prestressing of prestressed reinforcement

  • Analytical description of the deformation diagrams of concrete and pre-stressed high-strength reinforcement steel

    The article proposes an analytical description of the deformation diagrams of concrete and pre-stressed high-strength reinforcing steel used for development of calculation methods of reinforced concrete elements with combined prestressing. In the developed method of calculation is the rectangular stress distribution in the compressed area of the flexible reinforced concrete element is adopted actual curved that in the case where the relative height of the compressed zone of the cross section close to the boundary ξ ξR, significantly clarifies the calculation. With this purpose, the curve σв – EV, obtained at a Central compression of the concrete prisms.

    Keywords: stress-strain diagram of concrete, stress-strain diagram of steel

  • Results of Production Rresearches of Reliability of Tunnelling Combines of Selective Action

    Details are given as for the results of production researches of reliability of Tunnelling Combines KP21, produced by JSC Kopeisk Engineering Plant, in conditions of Almaznaya Mine of Coal Company "Gukovugol" when driving preparatory developments with section up to 16 sq.m and strength of country rock up to 7 units according to Protodyakonov Rock Strength Scale. The obtained data allowed to define average operating time before breakage, as well as to make the list of details and knots having the greatest effect on reliability of the combine. The results processed allowed to calculate numerical characteristics of empirical distribution, which are similar to numerical characteristics of a random variable: ensemble average, dispersion, average quadratic deviation, variation coefficient, etc.

    Keywords: tunnelling combine of selective action, reliability, operating time before breakage

  • Analysis of Efficiency of Application of Mine Loaders

    Technique of modeling operation of a loader on the basis of method of statistical tests is given in the article and the way of defining current specific expenses connected with operation of loader of a certain design and statement of tasks on their improvement is considered. Modeling the process of loader operation pursues the aim to define specific expenses of consumer on operating the car taking into account casual stream of refusals and restoration of operating state of separate knots and parts of the car at any moment of effective life, with possibility of making decision on efficiency of application of a certain machine design, as well as possibility of forecasting expected indicators of reliability and optimum terms of operation. Basic data and results of comparative analysis of expenses of consumer on operation of serial car 2PNB2 and new sample of MPNK car are given.

    Keywords: modeling, method of statistical tests, specific expenses, mine loaders

  • Simulation of a five-channel inverter with scalar control the motor speed by means of MATLAB / Simulink

    The article describes the results of simulation of a five-channel inverter with scalar control the motor speed. Briefly describes the principles of a scalar control, the structure of the five-channel inverter, as well as five-channel method of controlling the inverter using the method of double-zero sequence voltage (DZV). The structure of the model and the simulation results, confirming the possibility of using a five-channel inverter with scalar control the motor speed is considered.

    Keywords: motor, speed control, scalar control, five-channel inverter, Simulink

  • Implementation of the control unit stepper motor rotate camera robotic mobile platform

    This article describes the features of the implementation of the control unit stepper motor rotate camera mobile robotic platform using domestic components. Structure of a vector controller for a stepper motor analyzed. Selection of the control of the microcontroller for stepper motor control system is produced. The block diagram of the control unit stepper motor was developed.

    Keywords: mobile robotic platform, stepper motor, motor control, vector control, industrial electronics

  • Heat transfer from vertical heated pipe to fluid in conditions of free convection

    The main maintenance of a diversification of production as activity of subjects of managing is considered. being shown in purchase of the operating enterprises, the organizations of the new enterprises, redistribution of investments in interests of the organization and development of new production on available floor spaces. The most important organizational economic targets of a diversification of management are presented by innovative activity of the industrial enterprise.

    Keywords: heat transfer, coefficient of heat transfer, thermal conductivity, similarity criteria, electric analog, vertical pipe, fluid, air, hot-water boiler

  • The structure, grain structure and dielectric properties of multiferroic Bi 1-x La xFeO3 (x = 0.00-0.50)

    The investigations of the crystal structure, grain structure and dielectric properties of high-temperature multiferroic Bi1-x LaxFeO3 were carried out over a wide concentration range x = 0.00-0.50.

    Keywords: multiferroic crystal structure, grain structure, dielectric properties

  • Preparation, microstructure and dielectric spectra of the multiferroic Bi1-xPrxFeO3, x = 0.00-0.50

    The investigations of the crystal structure, grain structure and dielectric properties of high-temperature multiferroic Bi1-хPrxFeO3were carried out over a wide concentration range x = 0.00-0.50.

    Keywords: multiferroic crystal structure, grain structure, dielectric properties

  • Software implementation of the numerical solution of the inverse problem of transport materials

    The work contains the approximation of the third boundary value problem of schemes of high order. The approximation of the operator of the convective and diffusive transport difference schem were obtained, which has the fourth-order approximation error. The discrete operator diffusive transport in the absence of the influence of the boundary was considered.The construction of schemes of higher order accuracy approximates the operator diffusive transport in the border nodes in the case of boundary conditions of the third kind with the second order of accuracy was found.

    Keywords: Schemes of high order, diffusion, diffusion transfer, discrete operator, approximation, boundary conditions, boundary value problem, finite-difference scheme

  • Complex programs and algorithms for the calculation of sediment transport and transport of multicomponent suspensions on a multiprocessor computer system

    The work contains the construction and software implementation of related software systems designed for mathematical modeling of processes occurring in coastal water systems. The space-two-dimensional model of sediment transport in shallow waters allows to forecast the dynamics of bottom topography changes by reason of the movement of water and solid particles, to take into account the porosity of the soil, the critical shear stress at which begins the movement of sediment, turbulent exchange, dynamically changing geometry of the bottom, wind currents and friction on the bottom. The mathematical model of motion of a multicomponent air, takes into account factors such as the transport of pollutants and heat; the effect of vegetation; change in the coefficient of turbulent exchange; water transfer from the liquid to the gaseous state and others.

    Keywords: multiprocessor computer system, grid equations, suspended solids, sediment