Considered sharing FEM and BEM for the calculation of the dynamic behavior of the surface structures on the basis of a multilayer. To implement the BEM in calculating base proposed analytical method is effective for an arbitrary number of layers and the relations of their parameters. Given system approximating functions in the interface methods and proposed numerical integration formulas on the mating elements.
Keywords: finite element method, boundary element method, laminated base, fundamental solutions.
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In the framework of the nonlinear buckling considered the problem of determining the critical pressure, distributed over the face of the cylindrical shell. Buckling criterion is the appearance of positive acceleration directed along the normal to the middle surface of the shell. Numerical solution of the system implemented in MathCAD. Given its comparative analysis with the known solution formula Papkovich.
Keywords: cylindrical shell, nonlinear stability, numerical solution, the system MathCAD.
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The paper presents the experimental research of workplace air dedusting unit supply asphalt plant, as well as the dependence of the efficiency of dust collection and air filtration sand and gravel for the operating conditions of the power unit aerodynamic parameters of blowing-suction air flow and hydrodynamic parameters of the plume dispersed liquid.
Keywords: asphalt plant power unit, dedusting air, aerodynamic parameters, hydrodynamic parameters.
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Energy method in the form of Tymoshenko Ritz-solved the problem of stability of a circular cylindrical shell under uniform axial compression. Considered axisymmetric shape shell buckling during buckling and axisymmetric initial state, as well as axisymmetric subcritical state during compression. The resulting solution is exactly consistent with the decision of the Lorentz-Tymoshenko known as a classic.
Keywords: Skin, sustainability, energy, work, buckling.
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The article investigates the stability of the polymer rods epoxy resin EDT-10 taking into account the initial imperfections and development of creep deformation. A distinctive feature is the initial article was killed in a S-shaped curve.
Keywords: stability rods, creep, highly elastic deformation, polymeric materials, coupling equation Maxwell-Gurevich.
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The paper is devoted to the generalized analysis of the research on the influence of the electric field and organic gelling additives on the properties of foam concrete. It is shown that the transmission of the electric field close to the resonance frequency oscillations of the particles in the binder or the introduction of slip mass gelling components lead to a significant increase in the physical and mechanical characteristics of the foam.
Keywords: foam, impact properties, field modifiers.
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Processes associated with obtaining various purposes silicate materials is always accompanied by energy exchange between the interacting phases. Their thermodynamic analysis is not always possible due to the lack of appropriate reference material.
This paper proposes a priori estimate of the thermodynamic functions of silicate formation, as well as other oxide minerals, and their crystalline hydrates.
Keywords: silicates, thermodynamics, functions, education, specific heat.
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Each company that is party logistics supply chain, sooner or later faces the problem of choosing the logistics company. On what basis to make a choice in favor of one or other intermediary? Objectively calculate the pros and cons difficult: everything will be decided on a subjective level. Businesses need to know its logistics contractor, his behavior, requests opportunities. Therefore, the need technology to dynamically evaluate the behavior of the counterparty to a number of parameters, in particular scoring model reliability assessment of counterparties in the logistics system.
Keywords: logistic system, the scoring model, counterparty, logistics intermediary assessment of the reliability, efficiency.
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The technique of forming a two-stage system of transportation that allows you to determine the optimal location and number of transfer stations. Feature of the technique is the possibility of adapting the system generated to local conditions investigated territory.
Keywords: municipal solid waste, transportation process, land category, sanitary - protective zone, range of accommodation, critical distance.
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The article discusses the international and interregional cooperation, the establishment and operation experience on BEN example Euroregion "Donbass". The problems of joint strategizing long-term socio-economic development. Presents an analysis of defined specialization and competitive advantages Euroregion Donbass ".
Defined mission, goals and objectives of the long-term socio-economic development of the Euroregion "Donbass". As one of the development priorities of the Euroregion "Donbass" establishing the infrastructure and logistics development.
Keywords: international and interregional cooperation, the Euroregion "Donbass", strategizing, specialization and competitive advantage, long-term priorities of socio-economic development of the Euroregion "Donbass", infrastructure and logistics development.
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The article discusses the development and characterize the state of the consumer market of Rostov region, the comparative analysis of the main characteristics of the local consumer markets municipalities Rostov region, held their ranking.
Identified key issues of long-term development of the consumer market of Rostov region, in terms of infrastructure and organizational development, in terms of the development of competition, in terms of ensuring consumer protection. The main constraints on the development of the consumer market in the Rostov region.
Identified priority areas, the main objectives and activities of the development of the consumer market of Rostov region for the period until 2020.
Keywords: Consumer market and city consumer market, ranking, key challenges, constraints, priorities, objectives and activities of the regional long-term development of the consumer market, the strategy of socio-economic development of the region.
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The paper discusses guidelines for placing terminal infrastructure at the regional level (Rostov region). Accommodation terminal complexes considered at three levels: intermodal, regional and local logistics centers. For each level of the logistics centers defined criteria for their placement.
Keywords: logistics centers, transport, complex refractive assessment, transport and storage infrastructure.
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Carried out a comprehensive analysis of the factors governing the strength and resilience foams, for the manufacture of foam concrete mixes. Found that lowering the temperature of mixing water helps to improve the structural properties of the foams.
Keywords: surfactants, foam, lyotropic liquid crystals.
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Investigate ways to improve the efficiency and sustainability of organizational and technical systems for small and medium-sized businesses in the construction, through a systematic approach to organizing the process of functioning.
Keywords: small business, small businesses, construction, system approach, business process, S-shaped development.
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Simulate processes increase control efficiency of building production. The influence of organizational and technical level of construction operations for the duration of construction projects, productivity and cost of production.
Keywords: reliability, efficiency, building systems, modeling, quality, promotion, evaluation, interaction construction processes.
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Statement of the problem. Preparation of high-strength foam concrete in construction allows for energy and resource conservation. Water covers more than 50% of their dense component and on its properties depend strongly on structural properties of foam concrete, is not fully explored.
Results. The effect of mixing water of low temperature on the structure and properties of constructive penofibrobetonov. Recommendations on the account in the calculation of reinforced concrete elements elevated structural properties and deformation diagrams penofibrobetonov by mixing water setback.
Conclusions. Using low temperature mixing water improves the structure, increases the strength, deformability and elastic modulus, as well as changes of the deformation diagram fibropenobetonov.
Keywords: fibropenobetona, foam, water temperature mixing, macroporosity, economic efficiency, technical and economic assessment.
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The results of studies of the effect of complex polyfunctional additives consisting of superplasticizer stabilizer and redispersible powder on strength and shrinkage of cement paste.
Multiplicative model is developed, with which is possible to regulate the formation and development of deformation strength compositions for various compositions of dry building mixes. Dependencies describing the influence of the complex polymer additives on the formation and development of the deformation strength of cement stone. The functions of the coefficient values depending on the dosage used additives.
Keywords: dry mortar, cement stone, additives, modifiers, superplasticizer additive stabilizing effect, redispersible polymer powders, strength, shrinkage deformation.
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The influence of non-multi - repeated loads on columns of keramzito fibrobetona. Comparative results of tests Depends on the flexibility of columns, the eccentricity of the external force, the coefficient of reinforcement options and loading. The obtained results suggest that repeated loading nemnogokratno increase the carrying capacity of columns, compared with a single loading. This is especially effective for columns with low flexibility and small eccentricities external force.
Keywords: stand, keramzitofibrozhelezobeton, bearing capacity, nemnogokratno repeated loading, mixed reinforcement flexibility.
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With the development of market relations is becoming increasingly urgent problem of quality. The article describes the methodological approaches to improving the quality of cost-benefit analysis.
Keywords: criteria, quality analysis, quality costs.
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The author notes that the Russian system is necessary for the selection of professional civil servants across the country and it is even more true for the creative engineering professionals, those who have and can and should create and develop innovative technologies. For a real transition to an innovative economy must create the necessary critical mass of innovation. We lag behind the advanced countries in terms of the application of innovation, integral technological solutions, creating instruments for implementing new technological solutions. Necessary contribution to this process can make Russian Academy of Sciences in the case of its reconstruction. At the end of the article the author comes to the conclusion that it is necessary to attract the real modernization of Russian and foreign specialists examines the latest advances in nanotechnology that have been created in the last months of the year.
Keywords: innovators, innovative engineers, nanotechnology, innovative economy.
Information about authors of issue №1 (2012)
Keywords: authors