The accuracy of various models used to study inverse saturable absorbers is investigated in this paper. An exact solution of the problem of propagation of laser radiation through a medium with reverse saturable absorption is presented for the case of propagation of light signals with energy equal to the saturation energy in media without relaxation. We consider the case when a pulse of Gaussian shape. With an exact solution, the result of a numerical calculation of the transport equation and Bouguer's law is compared for the intensity of the accuracy realized by different methods of different accuracy. The paper is considered very small extent environment compared with the linear dimensions pulse. Schemes 1-4 of the order of accuracy for these two equations are constructed. For eight different schemes, approximation errors are given. It is shown that already with the use of third-order schemes for a laser pulse of 0.1 J the numerical solution differs from the exact one by only a few nanojoules. Thus, when studying the effect of RSA in large-sized carbon particles, substances where the effect is observed only at energies <1J, the use of third- and fourth-order methods may be unnecessary, especially when using a rather small step.

Keywords: numerical methods, transport equation, approximation, reverse saturable absorption

A comparative analysis of the methods of heat engineering calculation and an assessment of the efficiency of heat exchange in frame-panel housing construction are presented.

Keywords: Skeleton-panel housing construction, air permeability, heat exchange efficiency, heat and moisture regime

The article is devoted to the methods for improving of energy-efficiency of buildings. The article discusses the main facilities affecting the energy-efficiency of the building, ways to minimize energy losses.

Keywords: Improving of energy-efficiency of buildings, energy losses minimization, efficiency class, energy consumption, actions to reduce resource consumption

The issue of improving the coverage of highways of federal significance is under consideration. Measures are proposed to ensure the reliability and durability of coatings, taking into account the experience of road construction in the USSR. Measures to improve the efficiency of construction

Keywords: construction organization, construction economics, building structures, road surfaces

The article deals with the characteristics of hydrophobic swollen perlite and methods of its research. The perspective of the use of expanded perlite in various industries is described. Possibilities of application of these materials in practical use are shown.

Keywords: composite materials, energy saving, modification of perlite, hydrophobic perlite, methods for improving properties

The article deals with Justification for the design of protective clothing against cold, the main means of calculation and design assessment which is mathematical modeling. Justification of pilot studies of influence of parameters of a matrix of fixing of the special soft polymeric edges forming the additional locally concentrated rigidity of external material of the warmed clothes of a special purpose is presented in article. Technical characteristics and standard restrictions for the textile material considered at the heart of the projected product taking into account the requirement of GOST and operational criteria are given. Data on modern ways of increase in resistance of an external cover of clothes to the deforming influences for the purpose of preservation of internal volume and, as a result, necessary thermal insulation of clothes are submitted. On the basis of established experimentally dependences of rigidity of the modified material on width and thickness of polymeric channels the way identification of extreme density of filling of polymers of the internal surface of integumentary material with it taking into account the requirement of hygienic and operational character is offered.

Keywords: heat-shielding clothes, design, modeling, physical-biological characteristics of a person, clothes in water, cooling of the person

The PLExp application which is a superstructure for Excel and Access on the basis of VBA is developed. The appendix is intended for automation of planning and carrying out multiple-factor experiments, turning on the following blocks: planning; carrying out experiment; regression and dispersive analysis; forecasting; assessment of errors. Application of the appendix allows to raise efficiency of the researches connected with carrying out natural or model experiments as gives an opportunity to reduce the number of the required experiments, to automate processes of storage, extraction, information processing and search of optimal solutions.

Keywords: planning, factor, experiment, appendix, VBA, regression, dispersion, forecast, approximation error, function of a response, inquiry, modeling

This paper presents an overview of modern adaptive control systems for vehicle. It shows simulation results of vehicle flight with using the adaptation algorithm for position-control system, with estimation loop of additional disturbances, and with the reference mathematical model and astatism. The simulation results for two cases (for given constant coefficients of adapting and using the automatic settings adjustment coefficients) are presented.

Keywords: adaptive control, helicopter, position-trajectory control, observer, estimation, vehicle, flight,simulation

The article deals with the role of optimal number of protected connection canals from the point of you of economics and their orifitability quantity. The quantity of the profitability norm which should be obeyed at directed calculation is considered from the attitude of a person making decisions considering required level of information security. Here is the example of optimal calculation from the point of you of maximal profitability of he numbers of protected canals of data transmission.

Keywords: information security, secure channel of communication, closed channel of data transfer, profitability norm, optimum number of channels, obtaining information

Steady growth of the Russian Federation, the car park has led to the fact that almost all major cities of the country settings of the road network does not meet the increased intensity of traffic on basic highways in recent years. A significant increase in traffic volumes require to make informed decisions on the organization and management of road traffic on the basis of reliable information about the parameters of traffic flow. Modern problems of traffic in Volgograd considered in the article. The research results of basic characteristics of traffic flow in the more overloading parts of the road network and of the organization of work of public transport routes Volgograd. Set out possible ways of increasing the throughput of the street and road network and speed traffic flow. A comprehensive approach to solve this problem, including measures to improve traffic light control and traffic management of urban public transport, as well as the use of Intelligent transport systems.

Keywords: street and road network, traffic flow, traffic capacity, urban passenger transport, coordinated traffic light control, intelligent transport systems

The paper describes influence of content of dispersed polymer fiber on mechanical properties of mortar on basis of geopolymer binder. The studies were carried out on a geopolymer binder based on crushed granite and ground-granulated blast-furnace slag . Polypropylene fiber with length of 6 mm at a dosage of 0.22, 0.44 and 0.66% by volume was used as a reinforcing fiber. Dependencies were established for the compressive strength, flexural strength, fracture energy, and density from the dosage of the fiber at various times of hardening. It was established that fiber increases flexural strength and tensile strength of geopolymer mortar. It was shown that investigated fiber is characterized by high resistance to alkaline environment of the geopolymeric stone

Keywords: geopolymer, polypropylene fiber, dispersed reinforcement, compressive strength, flexural strength, tensile strength, resistance in alkaline environment

"One of the major drawbacks of modern alloyed metal cathodes Pd-Ba is the inhomogeneous distribution of the intermetallic Pd5Ba in the matrix Pd. This fact leads to an underestimation of life and technical performance of devices of microwave electronics on the basis of the cathodes. A substantial improvement in uniformity of cathode alloys Pd-Ba should lead the operation of mechanical activation of powder Pd, carried out prior to its compression process. The paper studied the effect of mechanical activation on the particle shape, particle size distribution and dispersion of powder Pd. It is shown that mechanical activation results in a substantial reduction in the average size and average particle size of Pd powder, as well as a substantial increase of the specific surface of the particles. The optimal regimes of mechanical activation of powder of Pd with a view to its use for metallosplavnyh cathodes."

Keywords: alloyed metal cathodes Pd-Ba, mechanical activation, dispersion, particle size distribution, average particle size, surface area, the emission properties

In this article we consider technique of determination of degree of homogeneity of heterogeneous mixtures by using tool contactless method. This method uses optoleptical information of mixture surface. This method can be used in automatic control systems. An optoleptical information may be obtained using standard devices of photosensitive scanning. The value of entropy of otptoleptical information is used to estimate the degree of mixture homogenization. Operations of component mixing are widely used in technological processes. The degree of homogenization of mixture is the one of quality indicators of mixing process. The degree of homogenization is usually determined by laboratory method, which requires additional time for analysis. The degree of homogenization can also be determined by using the senses. In this case, the results of determination depends on the experience of the expert. In this article we looked at an example for the paint industry. The method can be applied to a wide range of heterogeneous composition.

Keywords: Mixing, heterogeneous composition, homogenization, homogeneity,operation monitoring, tool optoleptical method, entropy of information

The article discusses the influence of socio-psychological climate office staff on success of professional activity of employees, their readiness to actions in extreme situations, on the stability of the personnel division. Based on the analysis of literature, we have highlighted aspects of studying socio-psychological climate, which allowed to develop a programme of training, aimed at optimizing the psychological atmosphere in the team. Analyzes the social-psychological climate of the team before and after training sessions. The results of the study allow us to consider socio-psychological training as a method of optimization of social-psychological climate in the team.

Keywords: social-psychological climate, social-psychological training, unity, coordination, conflictness, relationship in collective, the relation to the management, satisfaction with professional activity

Numerical-analytical solution of the problem of multicomponent mixture fractionation under action an electric field is constructed. This problem is known as the problem of zonal electrophoresis which extensively used in chemistry, medicine, and biology. Problem is reduced to study of the Cauchy problem for systems of hyperbolic type quasilinear equations in partial derivatives of first order. The proposed method is based on a generalized hodograph method, which allows obtaining an analytical solution of the problem in implicit form. Explicit form of the solution is recovered using the transformation of the Cauchy problem for system of quasilinear hyperbolic equations to the Cauchy problem for a system of ordinary differential equations that are solved numerically.

Keywords: electrophoresis, hyperbolic conservation laws, generalized hodograph method