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  • Statistical analysis of the wind load of the city of Volgograd for the period from 2003 to 2012

    the article is devoted to normalization of wind load according to the datas of meteorological stations the example of the city of Volgograd during the period from 2003 to 2012. Obtained the main statistical characteristics, the coefficient of reliability for wind load, wind roses are built.

    Keywords: probabilistic design, reliability, wind load

  • Research of influence of ventilation on formation of temperature and high-speed fields in the electrosteel-smelting shop

    For a research of features of formation of temperature and high-speed fields in volume of the electrosteel-smelting shop at various ways of distribution of stitched air the three-dimensional non-stationary model is used. By results of the made numerical experiment for the description of spatial distribution of air and thermal streams in the shop it is established that the most rational way of supply of stitched air in the considered shops is the way of "flooding of a working zone".

    Keywords: microclimate, all-exchange ventilation, air distributor, convective streams, stitched streams, electrosteel-smelting furnaces, speed, temperature

  • Traffic safety assessment on crossings

    In article traffic safety of vehicles at the movement on crossings is considered. Possibility of a road accident is estimated. In article the initial speed, size of a stopping way of the second vehicle, taking into account overall dimensions of vehicles are determined.

    Keywords: street road network, crossing, road accident, traffic safety, initial speed, stopping way

  • Effect of mechanical activation conditions on the particle size distribution and microstructure of industrial PZT-19 material

    The influence of mechanical activation conditions on the the sintering temperature, grain size and microstructure of PZT-19 ceramics was established. It was found that the mechanical activation method allows to increase the uniformity of ceramics grains.

    Keywords: ferroelectrics, particle size distribution, green building, mechanical activation, PZT

  • Simulation of the design activity diversification of innovative enterprise

    Within the framework of solving the problem of increasing the effectiveness of the directional properties of adaptive systems with parametric sonar emitting antenna in the results of generalization of theoretical and experimental studies of the effect of hydro-irregularities on the characteristic parameter of the antenna. A comparison of the results of calculations of the antenna directivity characteristic parameter derived from the model Khokhlova-Zabolotskaya-Kuznetsova, with the results of experimental measurements of the directional properties of the parametric array. We obtain the normalized dependence of the width of the parametric characteristics of the antenna by lowering the difference frequency from the center frequency of the pump waves of 5 to 16 times. The influence of changes in the speed of sound in the direction of the parametric array. We obtain the normalized dependence of the width of the antenna characteristics of the parametric values of the sound velocity at the surface of the pump transducer. It was found that the greatest impact on the characteristic parameter of the antenna has a change in the speed of sound to a distance equal to the lengths of 1-2 zone diffraction of the pump waves.

    Keywords: adaptive sonar system, efficiency, parametric antenna, directivity characteristic

  • Deformation models of shock proof devices to protect the joints

    This article presents the results of tests of samples on the basis of equiatomic alloy with shape memory effect. The obtained system of dimensionless quantities that adequately describe the elastic-plastic deformation. It is established that the assessment of scale effects in modeling shockproof device-based alloy with shape memory effect leads to the technical ability of extrapolation of experimental results to other objects to generate the initial data of the mathematical model under the condition of similarity of characteristics of external loads.

    Keywords: shock proof device, elastic-plastic deformation, shape memory effect, protection of the joints, scale factor

  • The influence of Fe powder on the electrical properties of the functional coatings based on polymer Na-CMC

    Investigated the influence of contents of sodium - carboxymethylcellulose, glycerin and powder Fe on electrical properties of composite coatings. Proposed regression model describing the relationship of the values of the electrical resistivity of the coating and dielectric strength to their composition used to predict the electrical properties of the formed coatings. Showed the correlation between the microstructure of coatings with Fe powder and electrical properties.

    Keywords: sodium-carboxymethylcellulose, the iron powder, dielectric strength, resistivity, composite material

  • Modeling the pulsating component of the wind load on the building frame by several calculation methods

    The simulation of the pulsating component of the wind load on the reinforced concrete skeleton of the building by the finite element method is considered in the article. The calculation of the pulsation component of the wind load was carried out according to the procedure specified in SP20.13330.2011 "Loads and Impacts" and calculation of the pulsating component of the wind load in accordance with the recommendations of CNIISK them. Kucherenko. Based on the results of the calculations, the analysis of the results obtained and conclusions are made.

    Keywords: finite element method, design scheme, vibration modes, pulsating component of wind load, building frame

  • Limiting properties of serial low-noise amplifiers

    The experimental research of amplitude characteristics of low-noise amplifiers of microwave range of АС180400-071 type of Joint-Stock Company "SKARD-ELEKTRONIKS" manufacture was made. It is shown, that power of saturation can vary from 34 to 75 mW at input power 10 mW. On a number of frequencies monotony of the amplitude characteristic is not provided.

    Keywords: limiting amplifier, power of saturation, measurement installation, amplitude characteristic

  • Consideration of the road accident mechanism on crossing of roads at an obtuse angle

    In article traffic safety of vehicles at the movement at intersections is considered. Possibility of a road accident is estimated. In article the interval of time at which TC2 becomes an obstacle for TC1 is defined and there can be a collision of the vehicles moving at an obtuse angle. Parameters of the movement of vehicles necessary for development of mathematical model are also determined.

    Keywords: street road network, intersection, road accident, traffic safety

  • Studies of dustiness in a residential area located near industrial enterprises with PM10 and PM2.5 particles

    Air pollution in residential areas near industrial plants is one of the most significant problems of modern ecology. The resulting dust is one of the important factors in assessing the adverse impact on the environment. Studies show that the greatest danger to the human body is particles up to 10 microns in size. When analyzing the dispersion of dust in the residential and industrial areas, it is possible to estimate the percentage of particles PM10 and PM2.5 from the total amount that is necessary to effectively control the effects of dust on human health. The article gives a comparative analysis of the results of studies of the dispersion composition and dust concentration in the air of the working zone and the urban environment.

    Keywords: sources of pollution, atmospheric air, dispersed analysis, PM10, PM2.5, dust, microscopic method, laser method, concentration, sanitary protection zone

  • " Traction complex optimization systems of rolling stock of railway transport"

    We explore the problem of the control system design of train asynchronous electric traction drives. The proposed train autopiloting contrl system ensures complex optimization of train traction, namely: keeping of desired speed of the wage wheels slippage relative to the rail thus ensuring the maximum traction; minimizes the loss of energy in the power unit of the electric traction drive under changing of speed and power of motion process. In order to solve the stated we use methods and principles of synergetic control theory

    Keywords: railway transport, traction drive, synthesis of control systems, traction optomization, energy saving controller, adaptive control, slippage

  • Some features of simulation of the dryer with a fluidized bed of inert particles

    The article presents a description of the main factors, which are necessary for correct simulation of process drying in a fluidized bed of inert particles. The main difficulties encountered in the scaling of laboratory dryers. Specify the nature of the impact interaction of the particles of inert and drying agent on heat-mass transfer in the drying process. Presents the description of the statistical models used to simulate the interaction of particles of inert material. Specify the main parameters and assumptions of the model. Presets the experimental conditions for the analysis of the nature of the motion of individual particles in a fluidized bed.

    Keywords: modeling, fluidization, inert, drying, mode, particle, layer, trajectory, scaling

  • Development of the system videoraspoznavaniya graphic images based on multi-agent recursive cognitive architectures

    The paper deals with the issue of establishing recognition of graphic objects in the video stream based on multi-agent recursive cognitive architectures. A structure of the system, a hierarchy of agents and their interactions. The article describes the developed messaging protocol between the subsystem coding information obtained from a video input device and the core of the multi-recursive cognitive architecture

    Keywords: multi-agent system, cognitive architecture, the agent, recognition, videoraspoznavanie, multimodal data, artificial intelligence

  • Frequency divider of a centimetric range

    The frequency divider for 8, operating in a range of input frequencies 8-18 GHz is considered. The function diagram is shown. The design and element base is described in short. The model and its experimental research is made. The technique and the block diagram of the experiment is described. Frequency dependence of transmission coefficient is measured. It is shown, that the frequency divider together with the two-cascade limiting amplifier has sensitivity minus 75 dBW, transmission coefficient is about 40 dB and nonuniformity of transmission coefficient is 1.64 dB. Level of the second and third harmonic of output signal is measured.

    Keywords: frequency divider, centimeter waves, microcircuit, experiment, amplitude-frequency characteristic