The article deals with the design of experiments for dispersed particles capturing in elektrocyclone. The autors gives planning matrix calculation, the regression equation based on the aerosol velocity and the initial concentration of the aerosol and plot of function.

Keywords: gas cleaning; cyclone; elektrocyclon; fly ash

"Application of solar energy in supplying various infrastructure units is urgent these days. Traditionally these were the centralized urban heating systems, which were used for heating buildings. The suggested heating system is composed of solar collectors with a total area of 44.16 m2 and with a volume flow of hot water to the consumer of 1.5 m3/h. Computer-aided heating circuit consists of traditional circuits, composed of solar collectors, circulation pump and a lamellar heat exchanger. Additionally, the scheme is extended by a fixed temperature water tank and a circuit, which interfaces the heating systems. They will be in their turn separated by a heat exchanger. The equipment also provides an opportunity of organizing a reverse pairing with the heating systems to return the excess heat into the network. This scheme has several modes of operation. In the conditions of nighttime, cloudy afternoon, light fog or smog water heating is provided by a central source. If during daytime, while being heated directly by the sun the water gets overheated the overheated water discharge mode is switched on automatically to discharge excess heat to a central heating system. The scheme provides for a “solar connectors and central source of heat parallel operation mode” to maintain the desired temperature, for example in the morning. According to the results of observations the share of water heating due to the solar collectors in summer is on average about 75%. Shared usage of central source of heat and solar collectors allows to efficiently use the available energy resources."

Keywords: renewable energy sources; solar collectors; computer-aided heating circuit; reverse pairing with the heating systems; efficient using of the available energy resources

In article are considered improvement of the organization of labor protection in the construction, based on a position of system risk management are considered.

Keywords: The risk, injuring factors, labour safety, assessment of the state of labour protection in the organization, improvement of OSH

In article statistical data on failures on a linear part of the main gas pipelines are presented, the reasons of their emergence are defined. Standard scenarios of development of emergencies are provided, and also the basic principles of determination of frequency of emergence of failures are shined.

Keywords: accident, analysis, diameter, linear part of the main gas pipelines, depressurization, scenario, pipeline.

The issue of increasing the strength of cutoff and grooving tools is considered in the paper. The principle of strength balance of edge is offered to be used in designing the replaceable inserts. The calculations are made and the shape is designed for the strength balanced front surface of the cutting tools. The analysis of the received data is made and the regularities of the designed shape of the front surface of the cutting edge are established. Designs of replaceable cutting inserts made with a glance to structural characteristics and operating conditions of the cutoff and grooving tools are offered.

Keywords: strength, cutting end, strength balance, cutting end, cutoff tools

Analysis of the effectiveness of the electrophysical activation of foam concrete mixtures was completed. The raw materials and experimental technique are described. Results of estimation of the effectiveness and impact of alternating electric field on the foam concrete mixes was presented. As object of research was made the impact of factors such as the grading of the aggregate and the tension created by the electric field on the physico-mechanical properties of foam concrete made of electroactivated mixtures. Conclusions are made on the basis of the obtained experimental dependencies.

Keywords: Variable electric field, foam-concrete mix, activation, grain size of sand, coefficient of structural quality, gelation, interpore partition

The article describes directions optimization of supply chains of the consumer market, inventory management of wholesale and retail executives and organizations that make it up. Presented the study methods of inventory control, disclosed the problems of development of modern theoretical and methodological platform of inventory management in wholesale and retail networks.

Keywords: Inventory management, supply chain, wholesale and retail link, logistics optimization.

In article questions of pilot studies of disperse structure of drop ablation are considered when putting electroplated coatings, the technique of performance of experiment is given, the design of experimental installation is considered, results of researches of dependence of height of take-off of drops of ablation over an electrolyte surface from their effective radius are given

Keywords: electroplated coatings, drop ablation, bubbling, drop, height of take-off of a drop, effective radius of a drop

One of the main and most relevant and profitable areas of agricultural production - produce quality seeds in the farms, in the process of post-harvest grain processing. Was evaluated basic parameters of the separation process on the existing scheme sieve winnowing machine with certain technological characterization of the purified grain material according to the different conditions of separation, the possibility of defining a predetermined fraction of a feed and seed quality of purified material. Synthesis was performed variational various separation schemes and functioning to identify optimum operating parameters. According to the results of the experiment set technological possibility and the main characteristics of the process producing high-quality purified fraction of the material given by the scheme, which provides the best performance.

Keywords: grain material, fractionation, modeling, cleaning of grain

The problem of synthesis of management by spatial orientation of GSP realized in real scale, its spatial situation providing high-precision definition in conditions of action of hindrances is considered.

Keywords: the inertial navigation system, the gyrostabilized platform, optimum control

This paper presents a comparative analysis of the effectiveness of the method Cuthill-McKee algorithm and fill-reducing ordering of a sparse matrix, based on multi-level nested dissection paradigm, developed at the Department of "Computer Science and Engineering," University of Minnesota. For short, we shall call the algorithm Cuthill-McKee CM, and the algorithm of the University of Minnesota — NodeND (Node nested dissection). This article uses a modification of the CM algorithm — RCM (reverse Cuthill-McKee), because in practice the reverse numbering index allows you to get a greater advantage than using a direct algorithm CM. The reason for using these algorithms are high speed computational algorithm, as it is necessary to solve the system proximal to the diagonal, the great acceleration of algorithms for solving FE problems using technology such as CUDA  

Keywords: finite element mesh renumbering methods, three-dimensional mathematical modeling, elasticity theory problems, finite element method, finite element meshes

The problem of temperature stresses in revetments of concrete plates taking in the account various conditions of temperature impact is considered. Contact conditions for various friction coefficient are considered. The simulation is made using finite element method in Ansys © software. The examples of exact simulations for stress fields are given for different parameters of problem

Keywords: temperature stresses, concrete plate, finite element method

the analysis of foreign researches, which consist of processes of functioning timber lorries is given. Decrease transport expenses with minimization of empty run of timber lorries and formations of rational structure of this park has been proved.

Keywords: timber lorries, functioning

The return coefficient task of determination of properties of a construction design by means of the device of neural networks is considered. As model the neural network in the form of a polutorasloyny predictor with possibility of iterative accumulation of volume is taken. Each subsequent step connected with addition of a new stream of neurons, is carried out only after training of the previous stream. Coefficients of synoptic communications pay off with the help of procedure of the return distribution from a condition of a minimum of function of an assessment. Algorithms of the solution of direct and return problems of multidimensional approximation are developed.

Keywords: neural network, approximation, synoptic communications, return distribution, construction designs

The nano-catalyst ceria (CeO2), activated by Pt nanoparticles, is known for being prospective and efficient material widely used in catalysis, fuel elements, and sensors. One of the most up-to-date methods of catalysts' reasearch is X-ray absorption spectroscopy (XAS) that is sensitive to the chemical state of catalyst's active centers [1,2]. Using XAS in the fluorescense detection mode at CeL1 line with high precision we studied electronic structure of Pt-activated nanoparticles of ceria at various redox conditions. In order to detect partial X-ray fluorescence yield the emission line CeLγ3 was used, which allowed us to increase spectral resolution. We researched local atomic and electronic structure of the materials under study. Oxygen vacansies were found to appear on the nanoparticles surface of ceria at 5% CO He atmosphere. Theoretical modeling of the obtained spectra at CeL1-edge demonstrated good agreement with experiment.

Keywords: X-ray absorption spectroscopy, HERFD, XAS, Ce-based catalysts, oxygen vacansies