On the basis of Reynolds's equations for thin layers of viscous Newtonian liquid laws of distribution of pressure are found in the incompressible and compressed bearing layers of a step support. For achievement of physically clearer comparison of lubricant properties and the bearing ability of two different lubricant environments the flat model of a step support is used. The algorithms of calculation of carrying power and rigidity of both lubricant layers allowing to pass to statement and the solution of problems of optimization of dimensionless geometrical parameters and comparative integrated characteristics of hydrodynamic and gasdynamic step support of sliding are received.

Keywords: lubricant layer, viscosity, pressure, density, Reynolds's equations, splines, Petrov's number

Introduction: The paper discusses methods to solve the problem of searching inactive queries for Oracle Databases in example . If there are no clear reasons for Deterioration of performance, database managers need to analyze very large amounts of statistical information provided by database management. The aim of study: to visualize the information, it is proposed to perform initial intellectual analysis the formation of a parameters model for the query to classify and Separate set of requests. Scope of work . Each query is described by three sets of parameters: specified query execution plan parameters, real implementation plan parameters, and the characteristics of the implementation environment. its consider according to the characteristics, purpose and importance of each set of parameters and the methods to get them .its depends of selection the parameters to use in SQL query model ,query execution conditions and data base settings (DBS). Moreover, its depends on fails in the nature of the system for client programs. Problem statements. The problem is formulated by the dynamic formation in the inactive SQL query model from some of sets parameters that already contained identifiers. Conclusion: The proposed of this approach will speed up the search for inactive queries and can be extended to others databases, with consider their characteristics.

Keywords: SQL, query, DBMS, Oracle, inefficient SQL query, grouping, clustering

In article a modelling and experimental survey of the controlled attenuator in a frequency range 2 - 4 GHz is performed. It is received the minimum attenuation no more than 3.5 dB, the maximum attenuation not less than 56 dB at a current 3.8 mA. The amplitude-frequency characteristic unevenness at a current 3.8 mA does not exceed 3 dB. The attenuator design is made in the form of the hybrid module. The attenuator is intended for adjustment of transfer constant of the microwave receiver.

Keywords: attenuator, pin-diode, amplitude-frequency characteristic, control current

The paper is devoted by studying of the correctness of the antenna pattern adaptive control problem in a randomly inhomogeneous medium. We use spectral methods for the solving the Helmholtz equation with variable parameters in the frozen medium approximation. We have proved the correctness of the problem of a given antenna pattern forming in a randomly inhomogeneous medium for the measured distribution of the complex wave amplitude in the plane of receivers in the first time. The possibility of using an antenna with a synthesized aperture for adaptive correction of the antenna pattern for maximization of communication channel capacity is substantiated. We use the refractive index model as the sum of the deterministic and random components in numerical modeling. The sampling intervals were chosen in accordance with the sampling theorem. The analytic expressions with given parameters were used as a model of the law of the antenna array operation. The results of numerical simulation confirmed that, in the first approximation, the problem of the antenna pattern controlling of a transmitter with a synthesized aperture based on the distribution of the complex wave amplitude measured in the plane of receivers is correct. It allows to create a system of adaptive antenna pattern correction for maximization of communication channel capacity.

Keywords: communication channel, directional pattern, complex amplitude, synthesized aperture, angular spectrum method, adaptive control

The features of the multidementional approach to risk management are considered, the necessity of applying methods of multidimensional risk management at various stages of risk management is justified, namely, the definition of context, analysis and risk management. Methods for multidimensional management of complex risks at each of these stages are proposed. The proposed methods, as part of a general approach to risk management, allow the introduction of new assessments of the effectiveness of risk management, reflecting, for example, the generalized risk for the system, the generalized risk of a particular risk event or risk situation.

Keywords: methods of multidimensional risk management, context definition, risk analysis, risk management

The problem of erection of a combined frame in high-rise housing construction is studied. The issues of installation of structures, space-planning scheme of high-rise buildings. Organizational and economic ways of perfection of technology of high-rise housing construction are offered.

Keywords: organization of construction; high-rise housing; reinforced concrete and steel structures

Article desribes the change in the ST-segment offset of the electrocardiagramm according to the variaty effects like fluctuations, respiration, additive noises, and heart rate deviation. Authors proposes to identify the ST-segment location in already synthesised ECG signal, adding an offset with consecutive nonlinear interpolation using National Instruments LabVIEW BioMedical Toolkit

Keywords: Electrocardiogram, ST-segment, synthesized ECG, elevation, depression, heart rate, T-tooth, isoline, smoothing, interpolation

The paper issues a technique for constructing effective data insertion procedures in structure-independent databases that uses the activity approach. The essence of this technique is to present the procedure in the form of an action mechanism that allows its semantics to be opened, thereby minimizing the number of identical same meaning characteristics. The use of the technique for data insertion procedures constructing into structure-independent databases, as well as the use of a NoSQL DBMS that is homogeneous in structure to structure-independent databases made it possible to significantly improve performance. You can judge it from the computational experiment which is performed in the work.

Keywords: data insertion procedure, structure-independent database, activity approach, technique, action mechanism, semantics, experiment, performance

The possibilities of theoretical and experimental methods for determining the rheological characteristics of technical fluids are explored. A comparative evaluation of rotational and gyroscopic viscometers was carried out. The phenomenon of slippage of layers of non-Newtonian fluid at the surface of measuring cylinders is revealed with increasing gradients of shear rates and filler content.

Keywords: Technical fluids, non-Newtonian environment, rheology, viscometer, rheological model, automotive engineering

The study on the hardness of samples from steel ST3 and 15G. On the basis of the correlation equations obtained values of ultimate strength of the examined steels. With the application of the law of three-parameter Weibull distribution constructed density distribution and the resulting minimum value of ultimate strength. The obtained results are proposed to use to determine the value of the resource for load-bearing systems of vehicles.

Keywords: reliability, lifetime, the hardness of steel, strength of steels, the endurance limit of steels, the Weibull law

The methods for determining the standards for the preventive maintenance system and repair are analyzed, it is found that the current norms are essentially outdated and require revision at the federal level. It is shown that the specifications for maintenance and repair specified by the operating time for modern cars should be revised in favor of standards determined by their condition, which will allow the introduction of individual standards for each car, taking into account the operating conditions and its technical condition.

Keywords: Strategy, method, standard, parameter, maintenance, repair, maintainability, mileage, reliability, operation

The problem of selection of diagnostic signs is solved by methods of statistical, spectral and entroic processing of signals and the logical analysis of their results. Results of data processing allowed to choose the most efficient characteristics (diagnostic signs) of signals providing separability of signals in the chosen priznakovy space i.e. classification. The problem of algorithmization of diagnostics of electrodrive fittings (further EPA) is solved as a problem of a pattern recognition of five classes of a condition of EPA on the basis of comparison of the current Boolean combinations to seven standards.

Keywords: electrodrive fittings, spectral analysis, entropy of Shannon, permutation entropy, basic vector, pattern recognition

The article considers the topicality of the development of cement foam concrete meeting modern requirements for energy saving and energy efficiency. The interrelation of physical and mechanical properties of cement foam concrete with the features of its structure formation at macro- and microlevel is considered. The main components for the manufacture of structural and heat-insulating cement foam concrete are described. The results of experiments on the determination of the dependence of the parameters of the structure of a foam concrete mixture, which form the physical and mechanical properties of finished products, are presented. A mechanism has been established for the active participation of particles of fibrous cellulose filler in the organization of the structure of a foam concrete mix and samples based on it. The optimal concentration of fibrous cellulose filler in the raw meal mix was confirmed.

Keywords: structural and heat-insulating foam concrete, modifying additives, technical carbon, fibrous filler

In the scientific article, the problem of instrumental and methodological support of works on a special assessment of working conditions is considered. The paper presents an approach to the selection of measuring equipment for the measurement of harmful production factors, which is based on the method of expert assessments. The results of studies of the application of the expert method for determining the possibility of using a group of instruments for the assessment of physical and chemical factors for conducting a special assessment of working conditions at workplaces of a machine building enterprise are presented. Recommendations are presented for equipping the laboratory with laboratories that carry out special assessment work in the conditions of machine building enterprises.

Keywords: labor protection, instrumentation, measuring equipment, special assessment of working conditions, method of expert evaluation

In this paper, the temperature distribution from a point source of heat under convective heat transfer is studied. The Navier-Stokes equation describing the steady two-dimensional laminar motion of a fluid is solved numerically. The distribution of the temperature field of a heat-loaded point source is obtained under appropriate boundary conditions, supplemented by the boundary conditions for the flow velocity to equal zero on the paraboloid walls by numerical integration using the control volume method.

Keywords: Radiator protrusion shape, thermal conductivity, thermal apparatus mode, the temperature of the heat source