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  • “Rozmysly” public open engineering forum of scientific and technological activities, social and technological entrepreneurship

    The project for creation of the first in Russia Engineering Forum of scientific and technological activities, social and technological entrepreneurship “Rozmysly” is presented, this forum develops the principles of an open public interdisciplinary electronic environment. The substantiation of the social significance of the project is given. The new project implies involving an even wider range of practitioners, research engineers, young scientists, applicants, graduate students, students and even senior pupils in scientific engineering knowledge by providing them with the opportunity to publish, read and discuss the results of promising research and development works, engineering solutions, inventions and rationalization or innovative proposals in the form of an electronic preprint. Conceptually, the project represents a new culture of scientific publications based on global and mini Internet platforms. It is shown that the basic advantage is achieved through the implementation of an open access initiative. From the date of publication, the material is available for the widest possible range of readers. The project is a kind of an interdisciplinary scientific and technological engineering forum.

    Keywords: site, Internet platform, engineering forum and storage, open access, preprint, foresight

  • Simulation of thermal creep inhomogeneous thick-walled cylinder axisymmetric

    The complete cycle of flat axisymmetrical problem solving is given in this paper: from getting the main resolving equation to solving the practical problem of polymeric tube creepage. Two non-linear laws of “stress-deformation” union are used: Maxwell-Gurevich law and Maxwell-Tomson law. Camparison and analysis of the obtained data are given, as in some cases it is enough to use Maxwell-Tomson equation than to use more complex Maxwell-Gurevich union equation. Solving of the problem is given with the use of numerical method – finite difference method. In the case of the temperature field, all physical-mechanical parameters of the material (elastic and relaxation) are taken as the temperature function. Thees, the non-uniformity of the material is considered. To determine the temperature field Furje heat transfer equation is used.

    Keywords: axisymmetrical problem, non-uniformity, creepage, Maxwell-Gurevich union equation, Maxwell-Tomson union equation

  • Calculation of reinforced concrete arch with the creep of concrete

    The article presents basic equations for reinforced concrete elements that are experiencing bending moment and axial force, taking into account the creep of concrete. The stress-strain state of reinforced concrete statically determinate three–hinged arch is investigated on the basis of these equations. Also for this task we gained the resolving equations of finite element method and compared the numerical-analytical calculation with the numerical performed using the finite element method to the arch loaded with a uniformly distributed load and having the shape of a circular arc. The calculations used viscoelastic model, according to which the total deformation is the sum of concrete elastic deformation and creep. We consider a rectangular cross section with symmetrical reinforcement. It is shown that because of creep stress redistribution between concrete and reinforcement arises.

    Keywords: finite element method, the creep of concrete, viscoelasticity, reinforced concrete arch, the stress–strain state.

  • Determination of long-term critical loads for compressed polymer rods with nonlinear creep

    The article provides information about method of sustainability calculation of compressed polymer rods taking into account nonlinear creep . As the law of the relationship between stress and strain is used nonlinear equation of Maxwell-Gurevich. Derived from the analysis of the resolving equations with time tends to infinity, we obtain an expression for a long critical force in the case of constant rigidity of the rod.

    Keywords: nonlinear creep, rod, stability, Maxwell-Gurevich, finite difference method, long critical force, relaxation viscosity, viscoelasticity, high elasticity modulus.

  • Plane strain condition polymer of the cylinder in terms of thermoviscoplastic

    The resolving equations for determining stress-strain state of thick-walled polymeric cylindrical shell under plane strain state with changes in temperature and highly elastic strains. Into law that describes the relation between stress and creep strain, the nonlinear equation of Maxwell-Gurevich. The solution is performed numerically using the finite element method.

    Keywords: nonlinear creep, plastic cylinder, highly elastic deformation, the equation of Maxwell-Gurevich, finite element method, viscoelasticity, modulus of viscoelasticity, plane strain state, temperature.

  • The practice of database formation for live monitoring university's development activity indices and it's rating growth

    We examine database formation that reflects university's development activity indices and it's rating improvement - for this we use the system developed for the Southern Federal University. The task of choosing a multiparametric DBMS is described. Entity-relationship model as a tool for database conceptual design is built. The database of formation and processing process is also modelled, for this we use the UML notation activity diagram.

    Keywords: development activity indices, rating impovement, DBMS (database management system), Entity-relationship model, UML, activity diagram

  • Plane strain elements cylindrical structures under the action of physical fields

    Considered concrete cylindrical body in axisymmetric formulation (plane strain condition), exposure to radiation and temperature effects. The influence of physical fields on the mechanical characteristics of the material of the body individually or in the aggregate. It is shown that the stress-strain state of the cylinder, under the joint account of the different physical fields, is very different from the stress-strain state, obtained by summing the individual results of the calculation of each factor separately, that is, the superposition principle is not respected.

    Keywords: temperature field, radiation, stress-strain state of the cylinder, the change of physical and mechanical parameters of the body

  • Rheology salt massif with a spherical cavity

    This article is related to technological problems of cavities with kamufletnyh explosions, during which the temperature in the cavity greatly exceeds the initial temperature of the array. Often these cavities are created in an array of rock salt. Because the salt even at light loads demonstrate expressive flow properties, it is interesting solution to the problem of creep salt massif with a cavity under the action of a force (pressure inside the cavity and the pressure of the soil), and thermal loads.

    Keywords: heterogeneity, creep, highly elastic deformation, hydrochloric array coupling equation, the integral relations

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  • Stability analysis of cores from EDB-10 at initial deflection of the rod in the form of an S-shaped curve

    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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  • Technique of monitoring and modeling of structure of politically active segment of social networks

      Nowadays, a dramatic increase in the influence of events of the blogosphere onto the world's political and social processes is observed. We in Northern - Caucasian Scientific Center of High School have developed techniques of social media monitoring and modeling of the structure of the thematic blogosphere segment. During monitoring process the following attributes are under analysis: sense of text, types, complexity and set of features of objects, types of relations between the objects themselves, etc. - to obtain complete range of blogosphere users’ opinions on a particular theme. The structure of the politically active segment of the social network is modeled with the help of graph, using appropriate mathematical methods of analysis. With the help of the technique been developed research of the social media communications was carried out in the context of the State Duma elections.

    Keywords: blogosphere, modeling, monitoring, election campaigning, social media, social networks