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  • "Variants of planning structures of blocks of nursery groups for KBR conditions "

    For implementation of the program of creation of additional places for children from two months to three years in the conditions of CBD the task on development of the minimum number of options of schemes of planning structures of blocks of nursery groups on the basis of which further development of standard projects for inclusion in the register of standard project documentation of Ministry of construction of Russia is planned is solved

    Keywords: Keywords:blocks of nursery groups, planning decision, group cell, kindergarten

  • Improvement of resource-saving technologies based on the use of design-insulating cellular concrete

    The actual problem of modern construction is considered - the expansion of resource-saving technologies. The use of dispersed reinforcement of cellular concrete allows to improve its strength characteristics, reduce the consumption of cement, one of the most expensive components of the concrete mix. When reinforcing cellular concrete with synthetic fibers, it is possible to obtain products with a lower density without reducing the strength characteristics.

    Keywords: resource-saving technologies, aerated concrete, monolithic construction, dispersed reinforcement, fiberglass, thermal resistance, external walling

  • Application of BIM in evaluation of property and project of EBIM

    Technical progress makes humanity create new technologies and methods in all spheres of life. Evaluation of property also in there. In current moment there are several methods, which are badly obsolete. For example, there are some cases, when building in decrepit or emergency condition were able to buy in cost several times higher than objective cost. These cases aren't unique. New method of evaluation of property could possibly help if not to stop in all appearing of this cases but less their amount. New method is based on Building Information Model (BIM). This model allow take all needed information about building in the currnet moment of time and see in dynamic, how change different indicators of building. This system can be more useful if it associates some amount of building, which differs indicators of interest building and reflecting effects of that building on themselves. This technology can be looked as Extented BIM. Consideration of implementing BIM in evaluation of property has very perspective vay - this can accelerate the time building can be evaluated, and also it let potential client to see all information about building which he need. This makes process of purchase-sale of property more clear, which, by turn, help avoid conflicts when property being researched before purchasing.

    Keywords: Building information model, Building, Evaluation of property, property, BIM, BIM-Technologies, Extented BIM, Using BIM, BIM-Modeling, BIM functions, BIM destination, BIM-model of building

  • Engineering management of material resources in the implementation of construction projects

    The article deals with the existing problems in our country, arising in the management of material resources in the process of construction of buildings and structures. The main problem in the material resources management system is that due to their late and incomplete delivery to the construction projects, there are significant downtime of working and construction machines and mechanisms. The don state technical University (DSTU) is developing an intelligent construction management system, which includes a method of planning and accounting for the movement of material resources to ensure synchronization of the processes of construction and installation works and their complete supply. The use of this technique allows to optimize the timing and volumes of supplies of material resources in accordance with a given technology of production operations and the simultaneous control of their inventory in the onsite warehouse

    Keywords: organization of construction; economy of construction, production of building materials

  • Solid-state synthesis of copper-containing zeolites: local atomic structure of catalytically active copper centers by means of XAS spectroscopy and DFT modeling

    Today, catalysts based on zeolites containing transition metal ions are being intensively developed, ensuring the selectivity of the reaction of direct oxidation of methane to methanol. In current work, the X-ray absorption spectroscopy complimented with the structural models obtained in frames of the density functional theory were used to study the dependence of the local atomic structure of copper centers in mordenite type zeolites synthesized by solid-phase ion exchange using CuCl and H-MOR, upon the annealing temperature at different stages of synthesis. The typical Cu – O interatomic distances and the corresponding coordination numbers are determined. The dependence of the fraction of copper ions on the zeolite on the annealing temperature was established.

    Keywords: EXAFS, DFT, zeolites, solid-phase synthesis, methanol synthesis

  • Effect of modification of aluminum oxide on cobalt catalyst of Fischer-Tropsch synthesis promoted by manganese oxide

    The physical and chemical properties of cobalt catalysts promoted by manganese oxides for the synthesis of hydrocarbons by the Fischer-Tropsch method are studied. The influence of polymorphic modifications of the alumina carrier on the specific surface area, pore volume, degree of reduction, size of cobalt crystallites,catalytic activity, dispersion degree of catalyst reduction is considered.

    Keywords: Synthesis of Fischer-Tropsch, synthetic hydrocarbons, the cobalt catalyst, promoter MnO2, the carrier of Al2O3, specific surface area, the degree of recovery of the catalytic activity, dispersion, and the crystallites of cobalt

  • The possspillity of use of eddy current method of non-destructive testing to find a hidden weld with wildcat changes in the integrity of the vehicle structure

    This article describes the control of the weld with illegal changes in the integrity of the design of motor vehicles, eddy current method of non-destructive testing. Description of the method and mathematical model. Experimental data are illustrated in tables and graphs. As well as the rationale for the effectiveness of this method.

    Keywords: non-destructive inspection method, a weld, a motor vehicle, the frequency, the defect, the integrity of the design

  • Features of technical risk assessment under non-deterministic stochastic parameters

    The quantitative methods of risk assessment of technological processes of manufacture and the analysis of level of deficiency of products in the conditions of nondeterministic stochastic parameters are considered. The properties defining reliability of process are its controllability, stability and reproducibility. The main methodical device by assessment and the analysis of these properties are provisions of standards on statistical methods of quality control. In the analysis and assessment of risk it is necessary to consider that borders of a tolerance zone of parameters of products and control limits of reliability of technological processes of its production are always considered as acceptable (admissible) risk levels. Overcoming these levels is considered a negative consequence in the form of increase in level of deficiency of products and decrease in accuracy of technological processes of its production. Technical solutions are always bound to risk as it is never impossible to be sure of the end estimated result in advance. To check whether this risk was justified, it is possible always only after realization of technical solution and approach of an undesirable event. Therefore technical activity in principle can't be completely free from any risk, and it is always necessary to go on necessary and justified risk consciously.

    Keywords: technical system, technological process, risk, indeterminacy, management of reliability, negative event, damage, nondeterministic stochastic parameter

  • Modeling and optimisation heat pump in cooling system of supercomputer

    In This study posed the problem of simulating the cooling system of supercomputers with a heat pump on the reverse Stirling cycle by numerical modeling of heat transfer processes in the object under study. The article presents the results of numerical simulation of heat transfer processes in the cooling system of processors of supercomputers with a heat pump on the reverse Stirling cycle. A numerical model of the heat transfer process was investigated. Using the method of numerical simulation of the heat transfer process, the dependences of the temperature delta, thermal resistance and the fraction of losses of the heat pump of the cooling system are obtained. The dependence of the ratio of the stroke of the piston to the diameter of the piston H / D of the heat pump has been revealed, taking into account the loss of the thermal resistance of the liquid cooling circuits and the elements of the design of the heat pump.

    Keywords: processor, heat flow, thermal resistance, Laplace equation, heat pump, heat exchange, Stirling backflow, cooling system

  • Quality control of agricultural machinery parts by dynamic non-destructive methods

    The problem of control of strength characteristics of agricultural machine parts by dynamic non-destructive methods of impact indentation of conical shape is considered. The quality of the most important parts is considered in terms of the set of mechanical characteristics that determine the strength, hardness, wear resistance and deformability. These characteristics should be known and be able to quickly and accurately control all parts both during production and during operation. The mechanical properties of metals are stochastic. For this purpose, a device for impact indentation was developed and a method based on the probabilistic laws of dispersion of mechanical characteristics was developed.

    Keywords: agricultural machines, reliability, quality control, mechanical characteristics, Weibull law, non-destructive testing, impact indentation

  • Derbent defensive system. Historical and architectural review

    The article gives a systematic review of the architectural composition of the oldest capital urban complex of the North Caucasus – the fortress of Derbent. On the material of historical sources stages of urban planning are reconstructed, the role of economic and foreign policy factors in the development of the urban environment in historical retrospect is shown.

    Keywords: industry history, architecture, urban planning

  • The use of dispersed reinforcement in low-rise construction of cellular concrete

    Currently, materials made of cellular concrete are increasingly used in construction. The strength of the cellular blocks depend on their densities. According to the test results, the dependence of the strength of aerated concrete samples on their density was obtained. However, if we reinforce the aerated concrete blocks with fiber, we will get very different values. When reinforcing cellular concrete with fibrillated fiber, the dependence of strength on density varies – the strength of the samples increases 1.8 – 2.4 times, compared with the strength of non-reinforced samples at a constant density. This means that when fiber is included in cellular concrete, blocks of such low grades as D300 - D400 can be used for the construction of load-bearing walls in low-rise construction

    Keywords: cellular concrete, aerated concrete, density, strength, reinforcement, fiber, thermal insulation, bearing wall, enclosing structure

  • Social services web 2.0 as a component of informatization of educational organizations

    The main goal of modernization in the field of education in the world is to achieve a new quality of the educational process corresponding to the new socio-economic conditions. This requires effective organization of the educational process, which will facilitate the search and development of abilities in each student. The result of the teacher’s work should be an active, creative, and cognitive organization of students' joint activities. Also important is the development of students' skills of the 21st century, which would be useful in their future professional activity, where the latter requires the ability to work not only with information, but also with people. These can be communication skills and teamwork skills, flexibility and adaptability, the use of the aggregate intelligence of a group that is a joint activity to achieve the goals.

    Keywords: Internet, Web 2.0 tools, social network, cognitive activity, network services

  • Detection of defects in the surface layer of bearings using the fractal dimension method

    The problem of recognition of defects in the surface layer of polished raceways of bearing rings according to the fractal dimension of the signals of the eddy current sensor is considered

    Keywords: fractal dimension, defect recognition, recognition algorithm

  • Use of digital resources and services in the web education system

    This article deals with such concepts as system of a continuing education and the electronic educational resources. A theoretical analysis of the informatization purposes of the educational process is presented. Analyzed the practical using of an electronic educational resources in the system of a continuing education. Distance education, information sources of complex structure, innovative educational and methodical complexes as a result of the using of digital technologies in the system of continuous education are presented.

    Keywords: continuing education, electronic educational resources, digital educational resources, informatization of the educational process, information sources of a complex structure, innovative educational and methodical complexes, distance education, digital res