Using a device of close homogeneous exponential queueing networks (QN) a mathematical model of an information system functiouning without considering influence of blockings was worked out. A proccessor and the united resourse "channel - external memory" are considered as shared resources. All the users' requests are assumed to be single and homogeneous and the servicing discipline "First Come First Served" is used for sequence of their execution. Analytic expressions are given for calculation of the integral characteristics of the system: the distribuition law of number of messages in a system, the average number of messages at a node, the average sojourn time of a message at a node, the average sojourn time of a message in a system.

Keywords: data base, blocking, queueing network, servicing discipline for messages, exponential distribution law, conceptual model, state space, the global balance equation, normalizing constant, stationary probability, the distribuition law of number of messages

Ceramic materials based on solid solutions La2-xSrxMO4, where M is Ni, Fe, Co, Cu, x = 0, 2 with layered K2NiF4 structure (structure of Ruddlesden-Popper) have been synthesized and investigated. The correlation of dielectric properties with a normalized bond lengths of the metal-oxygen has been observed. The existence of nickel atoms in the 2+ oxidation state for nickelates has been shown.

Keywords: solid solutions, colossal dielectric constant, resistivity, x-ray diffraction, dielectric spectrum, XANES, low-resistivity semiconductors, the activation energy, the distortion of the coordination polyhedra, oxygen non-stoichiometry

A certainly-element model is worked out soil-fundamental flag-overhead structure. The tensely-deformed state of fundamental flag is investigational taking into account the models of Winkler and Pasternak. On results a calculation charts are got diagrams sinking of fundamental flag.

Keywords: certainly-element model, Winkler elastic foundation, Pasternak elastic foundation,, coefficient of subgrade resistance, sinking of fundamental flag, stress-strain state

There are dendrological features of architectural design of the functional territorial zones taking into account environmental requirements enumerated in the paper. Particularly, we are talking about of the role of green spaces in residential, recreation and industrial zones and features of their selection for landscaping areas in natural and climatic conditions of Rostov-on-Don.

Keywords: functional territorial zones, urban development, ecology, dendrology, the system of green spaces, architectural and planning solutions, greening of urban areas, landscaping, residential areas

Using a device for close exponential networks of mass service a mathematical model for solving the problem of getting integral indexes of distributed information system on the basis of local computing network using two-level architecture “client-server” was worked out. The peculiarity of the model being worked out is in making a selective choice of information at the server and via the channel of communication not the full data base is transmitted but some separate parts of it, which satisfy the conditions of SQL-request search. Using the developed earlier heuristic algorithm the problem of optimal placing the distributed data base onto the local computing system knots according to the criterion of minimal average time of system reaction for users’ requests was solved. The results of numerical experiments are given.

Keywords: Distributed data base, selective information choice, SLQ-request, transaction, system conditions space, stationary probability, transitive probability, service intensity in network knots, information volume matrix, system reaction time

Using a device for close exponential networks of mass service a mathematical model for solving the problem of getting integral indexes of distributed information system on the basis of local computing network using file-server architecture was worked out. The heuristic algorithm of optimal placing the distributed data base onto local computing network knots according to the criterion of minimal average time of system reaction for users’ requests is represented. This algorithm uses the understanding of data bases as the points of multidimensional space and the knots in which those data bases are placed as clusters or classes. The results of numerical experiments are given.

Keywords: Distributed information system, distributed data base, local computing system, mass service network, conceptual model, exponential law of distributing the random value, stationary probability, mark process, the global balance equation, system reaction tim

The article examines the calculation of a building frame on the spatial plate-core scheme, taking into account the impact of emergency in the time domain by using the Finite Element Method (FEM). The calculation was performed considering the failure of the loaded columns of the building. The article includes the value added tax analyse and the conclusion about the protection of buildings against progressive destruction of.

Keywords: The calculation of reinforced concrete frame buildings, the impact of emergency in the time domain, Finite Element Method (FEM), the failure of the loaded columns ,the value added tax analyse, the protection of buildings against progressive destruction

The main purpose of this article is to demonstrate the advantages of statistical analysis of asymmetric relations between test items in the development of computer versions of psychodiagnostic tools. The main idea is that the statistical analysis of asymmetric relations between test items allows to describe the internal structure of the test in the form of incomplete oriented graph. The authors also attempt to identify some areas of possible applications of this analysis in psychodiagnostics and psychometrics: adaptive testing; assessment of discriminatory power of the test task; determining the reliability of the data. The authors base their arguments on analyzing results of 172 subjects tested by the Russian version of MMPI.

Keywords: Computer psychodiagnostics, adaptive testing, conjugation of variables, probability, statistical relationship, association, graphs

In the context of the autonomous functioning of special equipment in the Far North and the Arctic is necessary to use its internal resources to maintain optimal thermal state units and units. This can be accomplished using a heat recovery system of the internal combustion engine. For this purpose the heat accumulator. The mathematical modeling of the thermal state of the heat accumulator in the cooling stage. The main factors affecting the cooling time of the thermal battery: TA insulation thickness, weight coolant, coolant temperature, air temperature, wind speed. Also developed a mathematical model of the process of cooling the heat accumulator in general terms. It is presented in graphical form, which simplifies the determination of the time of cooling the heat accumulator in its design. For the definition of Q and Bi developed a program «Time».

Keywords: operation, heat storage, thermal preparation, heat transfer, heat recovery system, low negative temperature

The article examines the calculation of spherical shell coating on the overall stability under load. The calculated values of deformations in the vertical and horizontal plane. After the calculation of the conclusions and recommendations are given to conduct the necessary engineering activities to ensure the sustainability of the building.

Keywords: spherical shell; overall stability; arch farm; calculation of the building frame; finite element method

In article influence of various models of the soil base at calculation of the frame building of the hostel of RSUCE on functionality and operational characteristics of designs is considered. The final-element (FE) model of object is made and calculation in a program complex is executed. By results of calculation the analysis of the intense-deformed condition of the building and the basis is made. For research of influence of various models of the soil basis on the intense-deformed condition of the building models of the Pasternak and Vinkler and model taking into account a pliability of support are considered. The analysis found that the use of models taking into account the pliability of supports are more practical. This model allows the most accurate to see the interaction of building structures with elastic soil base and can be used in the real design.

Keywords: the core stiffness, the diaphragm stiffness, the structural design, the finite-element model, the stress-strain state, the base model, support yield, the coefficient of the bed, the intensity of reinforcing, orthotropy

This paper presents multimode waveguide Van-Atta array based on a pair of waveguide radiators. For dispersionless transmission lines we selected 3 coaxial lines, located inside a metal box, which frames the waveguides. Experimental data of monostatic radar cross-section diagram of antenna array in 6-12 GHz in frequency domain are obtained. Experimental study was performed in anechoic chamber of Share Scientific Center “Applied electrodynamics and antenna measurements”, Southern federal university. The subject of research was a model of multimode waveguide Van-Atta array based on a pair of waveguide radiators with aperture size 50*10 mm. An array placed in shield in the form of an elliptical cylinder. This configuration provides an opportunity to decrease ghost reflection from connectors and interconnection cable. A method for compensation background reflections, which experimentally performed on a model of multimode waveguide Van-Atta array, located inside an elliptical cylinder is proposed in this paper. This condition is completely accurate to the real usage conditions. This method is necessary for the research of objects with RCS commensurable with RCS of anechoic chamber. Backscattering diagrams, produced by aperture of Van-Atta array without background reradiation from constructional elements is obtained. The comparison between theoretical backscattering diagrams and results, which obtained by subtraction of experimental data of Van-Atta array with open aperture and aperture closed by radar-absorptive material is performed. Results by this method has shown good match between the numerical and experimental data. This fact confirms the accuracy of the proposed method for processing of experimental data.

Keywords: Van-Atta array, monostatic diagram of radar cross-section, multimode array, mesurements of scatterrin characteristics

With saturated boiling in water-ethanol 20 % wt detected peak flux qcr = 1.19 MW/m2. and at TL=70 the size qkp considerably increases to 9,80 MW/m2. The article contains results of the experiment on subcooled boiling in a mixture water-ethanol 20%. With growth subcooling is increased qcr, Тcr and αcr. The main factor is the sharp rise qcr increase wall temperature ∆Т=Тcr -ТL

Keywords: surface boiling of mixture, peak flux, wall temperature, critical heat transfer coefficient

Carry to the main advantages of galvanic ways of restoration: possibility of formation of a layer from several micrometers thick to 1-2 mm. metal or a combination of metals with the set properties, restoration "in the size", that is without the subsequent machining, simultaneous restoration of several surfaces and use of a small amount of electrolyte. A number of the devices allowing to provide the demanded conditions is developed for implementation of galvanomekhanichesky sedimentation of coverings. As the activating elements in these devices generally apply abrasive materials which working surface, in the course of work, "is salted", that is it is hammered with cutting products. It considerably reduces efficiency of activation of the cathode and uniformity of the received deposit in view of introduction in the formed layer the activating elements of products of activation. The offered device developed by Zakharov Yu.A. and Spitsyn I.A. it is deprived of such shortcoming in view of application of the activating elements in the form of leaders and the conducted abrasive rollers connected by a belt drive. For elimination of this lack of the existing devices by Zakharov Yu.A. and Spitsyn I.A. (patent No. 2503753) the device was developed for galvanomekhanichesky sedimentation of coverings on internal cylindrical surfaces of details. Difference of the offered device is that at sedimentation of an electrodeposit, the conducting and conducted rollers, being rolled on the activated cathode surface, rotate with various district speed because of their various diameter. As pulleys of leaders and the conducted rollers are connected by a belt drive, to the transfer relation no more than 0,8-0,9, on shaft of rollers there is various district force forcing the conducted rollers to slip rather cathodic surface. It provides better removal of the passivating film and continuous change of the surface of the activating roller contacting to the activated cathodic surface. Thus, the free surface of the activating roller is washed by a channel of electrolyte, being cleared of activation products that interferes with formation of so-called "zasalivaniye" of a wor1king surface of the activating elements (rollers).

Keywords: case detail, restoration, repair, defect, resource way of restoration, car repair production

Obtained a simplified mathematical model of generation of the aerosol. Theoretical and experimental dependence of the convection current on the parameters of the generator, from its basic design parameters.

Keywords: the aerosol, convection current, electric field, space charge, dispersion, electrode potential, charge, drop, generator, field strength