The questions related to the study of various varying factors on the strength of normal sections in beams. Here's a program of research by one methodology designed to study the effect of the type and content of steel reinforcement and externally composite on the strength of normal sections that have not previously been investigated.

Keywords: Concrete, reinforced concrete, the percentage of reinforcement, carbon frp sheets, fiberglass, laminates

Structure and features of biosignals digital processing in measuring convertor of auditory evoked potentials of bioelectrical brain activity are considered at this article. Measuring convertor of auditory evoked potentials of bioelectrical brain activity is the main part of neurological diagnostics systems allowed to obtain information about the current state of the human nervous system. This paper describes the processing method of evoked potentials based on recording and processing a continuous electroencephalographic (EEG) signal. The proposed method consists of three main steps: registration of the EEG signal, segmentation of the EEG signal and the averaging of segmented fragments of the EEG signal.

Keywords: measuring convertor of biosignal, evoked potential of bioelectrical brain activity, biosignal averaging

Method of successive approximations was used to solve the problem of optimization of multispan continuous beam. Cross section of a beam was a welded I-beam.  By the variation of the width of the shelf we ensured that the maximum equivalent stress for energy theory of strength in each section is the same throughout. The solution is made numerically using complex MatLab. Bearing capacity of beams with variable stiffness along the length increased in 2 times in comparison with the beam with constant stiffness and the same mass. The proposed method can be applied to frames, taking into account the contribution of longitudinal forces in the equal stresses. Another effective way to change stiffness is to change the height of the wall of I-beam. In practice curvilinear shape of beams or shelves are not used because of complexity of manufacturing. They are replaced by the discrete form of cross section.

Keywords: multispan beams, work method, optimization, uniform strength, welded I-beam, variable stiffness

An analysis for the influence, of type and quantity of steel and composite reinforcement, on the normal cracks development, at different load levels, and by the maximum allowable deflection in beams. It was Found that throughout the load range, the reference beams are most cracked. The reduction degree in crack width depends on the strength and percentage of the steel reinforcement.

Keywords: concrete, reinforced concrete, steel, fiberglass, carbon fiber, laminate, maximum allowable crack width, load level, the development of cracks, the relative width

  Method of an automatic recognition of sleep events is described. The method is based on analysis of amplitude histograms that are built on each of registered channels. The method is designed for sleep events, distinctive feature of which is expressed amplitude change that appears simultaneously on several channels. For example, "General body movement" and "Limbs movement" events. But this is not limited; method can be applied to other events, for example "Snore". Algorithm can be divided into three stages: histograms building and analysis, vertical analysis, results processing.

Keywords: PSG, sleep events, histogram, detection algorithm

The  researches results of possibility of  equations simplification of ring dynamic, which is based on two bearings with the help of task of special base functions system, in accordance with conditions of  zero transmissions in bearings points are represented. The calculation of the coefficients of the basis functions of a linear function and the polynomial of degree  two and three.

Keywords: ring based on two bearings, zero displacement at points bearings, system of basis functions

  The analysis of a spherically converging sound beam is made. As the parameter reflecting evolution of a wave, the front surface curvature is used. The expressions are received, allowing determining value of a phase front curvature of sound beams with various amplitude distributions. Axial and cross distributions of front curvature of focused beam with gauss and uniform amplitude distributions are resulted. Different influence of radiator surface curvature on wave front dynamics in cases ,  and  is marked. Similar characteristics for a flat radiator are presented. 

Keywords: Focusing radiator; diffraction; phase front curvature

This article addresses options for building advanced of resistive voltage dividers (attenuator), providing a reduction in a given number of once input voltage in a wide range of operating frequencies. To correct the frequency error in the AT parasitic capacitance the load is proposed modified scheme with the special frequency attenuator correction, which allows for one to two orders extend the range of working frequencies the AT and increase performance.
Results of computer modeling.

Keywords: attenuator, a resistive voltage divider, the parasitic capacitance load correction capacitor, speed, large-amplitude pulse signal, the compensation effect, the upper frequency limit, broadband, analog-to-digital interfaces

Development of urban areas, especially Rostov-on-Don, which is one the largest city of the south of Russia, should be based on a comprehensive assessment and analysis of the structure of housing stock and engineering services, which provide all types of resources for the city. Research of the structure of housing stock, analysis of residential and private housings, municipal and business buildings, information on the territorial distribution of these objects with reference to the topography would allow to create a reliable information base for the development of district heating schemes. Housing stock of Rostov-on-Don was ranked by the year of construction, number of floors and material of the wall. The article assesses the providing of municipal and business buildings, kindergartens, schools, institutions consumer services, culture and sport institutions.

Keywords: urban development, energy, heating, year of construction, material of walls, floors

  The components of force plate signals, generated by cardiac activity, are investigated. The person stays in an ortograde posture, sit in the relaxed pose and in a pose at which the trunk keeps vertically and don’t contact with seatback. On the basis of a spectral approach features of power plate “Stabilan” indications and hardware-software complex «A multifunctional chair» are analyzed at inspection of the person holding set postures in different functional conditions (before and after physical activity). It is shown that change of vertical force (ballistogramm data) is an integrative signal. Manifestation of muscular components in force plate signals for an ortograde posture and a human pose sitting with vertical trunk are discussed.

Keywords: Force plate vertical signal, cardiac activity, posture stabilization

The article is devoted to the peculiarities of eclecticism in the central part of the city of Rostov-on-Don at the turn of the XIX - XX centuries. The Russian architecture in the years 1840-1850. prevailing eclecticism. All the variety of its variants is reduced in the Russian architecture in two varieties: the first of which dates back to the tradition of a warrant (neogrek, Renaissance, Baroque, Rococo, pampeyansky), and the second - to the non-classical heritage (Byzantine, Russian, Gothic, Romanesque styles). In Rostov architecture became widespread both varieties. This was facilitated not only the diversity of life in the city, the intensive development of trade industry, generating a variety of new types of buildings, but also the technical progress by which the means of production have changed.

Keywords: city​​, eclectic architecture, building, shape

The article considers the problem of maximum flow of minimum cost finding in fuzzy dynamic transportation network. The relevance of the problem is in its wide practical application on the rail, air, sea and other roads in finding of routes of minimum cost. The feature of the problem statement is that fuzzy nature of the network parameters, such as arc capacities and costs is taken into account. It allows us to make decisions more sensitive to environmental changes. The dependence of network parameters from flow departure is also considered, that allows to introduce the notion "dynamic" network as opposed to "stationary-dynamic", examined in the literature. The algorithm for solving the described problem in fuzzy conditions is proposed. To illustrate the algorithm a numerical example is presented.

Keywords: dynamic network, maximum flow of minimum cost, fuzzy numbers, arc capacity, transit time

"Examines the relationship of the concepts on the example of post-war reconstruction of post-war reconstruction of the city of Rostov-on-Don.
In 1945, the Chairman of the Committee on Architecture AG Mordvinov announced seven conditions under which you can create the city.
In 1945, the development of the urban plan of rebuilding the city of Rostov-on-Don was appointed academician of architecture VN Semenov.
In 1949. master plan was finalized at the construction site.
In general, the basic idea of the architect was executed. Among the fifteen cities prone to restore the city of Rostov was restored in all seven conditions put forward by the Chairman and the Committee for Architecture AG Mordvinov, projected architecture academician VN Semenov and given a reality by means of the chief architect of YA Rehbein."  

Keywords: master plan, concept, post-war reconstruction, the condition of the city

In this paper, a new simple and accurate hybrid table/analytical model of the MOSFET drain current based on the interpolation of table parameters is proposed. This new hybrid table model has an accuracy similar to the pure table models but requires no complex parameter extraction. The drain current in the hybrid model is calculated as the product of the analytical model current and the correction factor approximated by two-dimensional series.

Keywords: MOS-transistor, MOSFET parameters, cryogenic temperature, parametric identification

Briefly discussed the theoretical model of the spectrum of RR intervals and its changes depending on the processes taking place. Made a device for measuring cardiointervalogramms (CIG). Obtained from the renting of data, of varying duration and frequency shall be recorded for further processing. The analysis revealed that the resulting spectrum satisfies the conditions considered in the theoretical model, and can be further analyzed with fractal characteristics. Such an analysis is of great importance in the diagnosis of the patient directly to the duration of the therapeutic procedure for the optimization of both time and intensity exerted influence.

Keywords: CIG; fractal series; the spectrum of RR intervals