Examples of bearings with hydrodynamic wedge are mapped to specific features of the incompressible lubrication (drip liquid) and compressible (gas). Due to the physical nature of the processes occurring in the gas lubricating layer. The main advantages of axial and radial gas dynamic bearing with spiral mikrokanale, which was the most widely and effective used not only as bearings, but also as the best contactless seal.

Keywords: lubrication layer, hydrodynamic wedge, pressure, load capacity, helical grooves, optimal parameters

The project for creation of the first in Russia Engineering Forum of scientific and technological activities, social and technological entrepreneurship “Rozmysly” is presented, this forum develops the principles of an open public interdisciplinary electronic environment. The substantiation of the social significance of the project is given. The new project implies involving an even wider range of practitioners, research engineers, young scientists, applicants, graduate students, students and even senior pupils in scientific engineering knowledge by providing them with the opportunity to publish, read and discuss the results of promising research and development works, engineering solutions, inventions and rationalization or innovative proposals in the form of an electronic preprint. Conceptually, the project represents a new culture of scientific publications based on global and mini Internet platforms. It is shown that the basic advantage is achieved through the implementation of an open access initiative. From the date of publication, the material is available for the widest possible range of readers. The project is a kind of an interdisciplinary scientific and technological engineering forum.

Keywords: site, Internet platform, engineering forum and storage, open access, preprint, foresight

The article deals with the movement of erythrocytes along the narrow capillaries with a diameter smaller than the erythrocyte diameter. Red blood cell in narrow capillary has tank-treading motion. The erythrocyte rotation frequency reaches several dozen revolutions per second. Electric charges located on the surface of the erythrocyte, move together with the erythrocyte membrane and create a magnetic field in the surrounding space. A two-dimensional model of erythrocyte movement along narrow capillaries was constructed. If the erythrocyte surface area and erythrocyte charge are known, then the density of charges on the erythrocyte membrane can be determined. The magnetic field strength of a moving charged particle can be determined if the particle charge, the particle velocity, the distance from the particle to the point at which the magnetic field strength is determined, the angle between the direction of the particle velocity and the direct connecting particle, and the point at which the tension is determined are known. The total strength of the magnetic field of several moving charged particles is defined as the vector sum of the magnetic field strengths of the individual moving charged particles. In the two-dimensional model it is assumed that the red blood cells are rectangles that move along the capillary, and the erythrocyte membrane is the sides of the rectangle. Discrete charges are located on the sides of the rectangle and move either clockwise or counterclockwise. It is possible two variants. Their membranes either rotate in the same direction or in opposite directions. Calculations were carried out for both variants and at different rates of rotation of erythrocyte membranes (from 0 to 50 revolutions per second) and distances between red blood cells. It is shown that at distances between erythrocytes smaller than the two capillary diameters, the influence of neighboring red blood cells can be neglected (the difference is less than 3%).

Keywords: "mathematical model, magnetic field, erythrocytes, narrow capillaries, magnetic field strength "

Modern urban development policy pays special attention to the application of new and well-known technologies in the development of underground spaces of historically developed urban areas. Rational use of urban areas occurs up and down, without expanding the boundaries of urban areas. Technology "slurry wall" in the development of underground space continues to rapidly gain popularity. The use of this method allows to solve the problem of construction in cramped conditions and is one of the most popular in modern urban development practice

Keywords: rational use of urban underground space, advanced construction technologies in cramped conditions

The paper deals with the investigation of exploitation technological efficiency of metall-cutting machine tools. The main goal of this study is to determine more advanced way of choice of equipment and to organize metall-cutting machine tools rational maintenance. Classification of basic and optional evaluative measures is presented in the first part of the paper. The research methodology provides the estimation of exploitation technological efficiency by calculation of the complex evaluative measure. The results of comparative estimation of two metall-cutting machine tools (Okuma LB 4000 EX, CTX Gamma 2000) are presented in the last part of the paper. According to evaluation result, Okuma LB 4000 EX stands at a higher level of exploitation technological efficiency.

Keywords: exploitation technological efficiency, comparative estimation, complex evaluative measure, methodology, data analysis

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