×

You are using an outdated browser Internet Explorer. It does not support some functions of the site.

Recommend that you install one of the following browsers: Firefox, Opera or Chrome.

Contacts:

+7 961 270-60-01
ivdon3@bk.ru

  • Informational database model for accounting of the teachers workload of an educational organization

    This paper presents an information model of a relational database developed by the authors, designed to take into account the teachers workload of an educational organization. The identification of the subject area entities, their decomposition and the relationships identification between them are carried out. The constructed database model was brought to the Boyes - Codd normal form. Based on the designed database schema, its physical implementation and filling with test data was carried out. The results of test queries showed the developed model adequacy and the its practical applicationp ossibility. It is currently in trial operation at the Department of Information Systems and Computer Modeling, Volgograd State University. With minimal changes, the developed database schema can be applied to account for the teachers workload in various educational organizations.

    Keywords: database, information modeling, "entity-relationship" diagram, decomposition, information system, educational organization

  • Phonon properties of hydrogenated carbon nanofilms

    In this work, the phonon format of graphane nanoribbons is calculated in the Hamiltonian formulaism. The geometric model is presented in the form of a graphene plane with hydrogen atoms attached to it. The unit cell of graphane contains two carbon atoms from solid graphene and two carbon atoms. The curvature of the graphene plane as a result of attachment to hydrogen atoms and hybridization of the outer electron orbitals of carbon atoms from sp2 to sp3, as well as the interaction between hydrogen atoms, are not taken into account. Analysis of the obtained phonon spectra shows that, for any type and width of graphane nanoribbons, there is a gap between acoustic and optical vibrational modes, in contrast to graphene, which can serve as an indicator for a given structure. Also, for the material under study, the values ​​of the speed of sound and the Debye temperature were calculated.

    Keywords: graphene, graphane, nanoribbon, unit cell, vibrational spectrum, dispersion equation

  • Improvement of the environmental management system of electric power industry organizations

    The article discusses the features of environmental safety management systems of organizations in the electric power sector, and also presents an approach to their improvement. The authors substantiate that an important aspect of improving the environmental safety of electric power companies is the integration of quality and environmental management processes in the organization. Based on the analysis of scientific literature and the regulatory framework, the problems of integration of environmental management systems, quality management and organization management are identified. As one of the approaches to improving the environmental management system of electric power industry organizations, a management model of an environmentally-oriented organization based on the PDCA cycle and a quality management system, as well as scientifically based principles of its construction, is proposed. The key advantages of the model are: an expanded methodological base in comparison with the models of environmental management and quality management based on the Deming сycle "Plan-Do-Check-Act" the possibility of effective integration with the general management system; decision-making based on various factors of the external and internal environment of the organization.

    Keywords: environmental safety, integrated management model, environmental safety management in the electric power industry, Deming сycle

  • Problems of functioning of environmental safety systems at industrial enterprises

    The article considers the main approaches to the organization of ecological management and environmental safety at industrial enterprises in Russia, highlights the key problems and trends of environmental management in industry, factors and conditions for ensuring environmental safety in the production sector. Based on a comprehensive analysis of scientific literature and activities to ensure the implementation of ecological management of large industrial enterprises in the country, the main directions and problems of practical implementation of environmental management, as well as the design and operation of environmental safety systems in the industrial sector are identified: insufficient experience in developing and implementing an environmental strategy; fragmented use of elements and methods of environmental management; lack of methodological support for effective integration of the environmental management system into the management system of industrial enterprises; problems of corporate governance and others.

    Keywords: ecological management, ecological safety, ecological management, environmental safety management system, industrial enterprise management

  • Comparative analysis of the effectiveness of various types of overhead natural lighting systems in public and industrial buildings

    The article deals with the comparative analysis of traditional and new types of lighting systems in multistory public and industrial buildings. The analysis is being conducted with use of some specific objective and subjected criteria. These include a number of design characteristics of the systems in question – from an overall cost of the installation to the psychological contact with the outdoor environment. It is noted, that the main characteristic of a human activity is productivity and this depends upon the working conductions, which are evaluated on the basis of subjective appraisal. The best solution of the system of natural lighting, according to the number of criteria considered, which matches the above requirements is the system of lighting wells, combined with the windows.

    Keywords: the system of roof natural lighting, objective and subjective appraisal, comfort of indoor environment, evaluation criteria, public and industrial buildings

  • Effect of oxide additives on the structural properties of the cobalt catalyst for the synthesis of hydrocarbons

    The structural properties of cobalt catalysts and their active component are studied. The influence of metal oxides on the specific surface area, pore volume and size, the average crystallite size and the active surface area of the catalyst Co-Al2O3/SiO2 was studied.

    Keywords: Fischer-Tropsch synthesis, synthetic hydrocarbons, catalyst, cobalt, promoter, carrier, specific surface, porous structure, catalytic activity, degree of reduction, active surface area

  • 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

  • Investigation of the effect of Zr and Mn promoters on the properties of cobalt catalysts for Fischer-Tropsch synthesis

    The parameters of the porous structure and the active surface of cobalt catalysts for Fischer-Tropsch synthesis (SFT) prepared by the impregnation method have been studied. Characteristics of composition and porous structure were studied using elemental analysis and the Brunauer-Emmett-Taylor method (BET). The effect of the addition of oxide promoters on the specific surface area, pore volume and pore size of the Co / SiO2 catalyst has been studied.

    Keywords: Fischer-Tropsch synthesis, heterogeneous catalyst, promoter, carrier, specific surface area, porous structure, selectivity, activity, dipping method

  • Cobalt Fischer-Tropsch synthesis catalysts supported on Al2O3 of various polymorphic modifications

    The parameters of the porous structure and the outer surface of cobalt catalysts for the synthesis of Fischer-Tropsch, promoted by magnesium, prepared by the impregnation method according to moisture capacity, were studied. The effect of polymorphic modification (γ, θ, α) of the carrier on the physicochemical properties of the catalyst Co-Mg / Al2O3 was studied.

    Keywords: Fischer-Tropsch synthesis, polymorphic modifications of Al2O3, synthetic motor fuel, catalyst, carrier, elemental analysis, BET method, specific surface, porous structure

  • Statistical characteristics of pseudorandom signal generators based on Lorentz, Chua and Dmitriev-Kislov systems, implemented over a finite Galois field

    The statistical characteristics and results of the FIPS 140-2 tests of a new class of pseudo-random signal generators based on modified Lorentz, Chua and Dmitriev-Kislov systems over the finite Galois field are considered. The estimates of the sidelobe levels of the correlation functions of the signals, as well as histograms of the probability distributions of the generated numbers, are obtained. Evaluations of compliance with the requirements of the FIPS 140-2 test of binary sequences generated on the basis of systems under variation of their parameters are obtained. The results of the work can be used in the construction of communication systems with broadband signals, simulation and cryptography.

    Keywords: dynamic chaos, radioelectronic dynamic systems, statistical properties

  • Influence of the method of introducing additives on the composition and porous structure of Co-catalysts for the synthesis of hydrocarbons

    Three batches of Co-MxOy / SiO2 catalysts were prepared with different methods of introducing an oxide additive. Physicochemical studies of catalysts by elemental analysis and Brunauer-Emmett-Taylor (BET) methods have been carried out. The effect of additives of oxide promoters and the method of their introduction on the specific surface, volume and pore sizes for Fischer-Tropsch synthesis catalysts were studied.

    Keywords: Fischer-Tropsch synthesis, carbon-containing resources, catalyst, active component, silicate carrier, Al2O3 and ZrO2 promoters, elemental analysis, BET method, surface area, volume and pore size

  • Influence of the method of introducing a promoter on the properties of the active component Co catalysts for the synthesis of hydrocarbons

    Using the methods of thermo-programmed reduction (TPV) and thermo-programmed hydrogen desorption (TPD H2), physico-chemical studies of Co-MxOy / SiO2 catalysts obtained by various methods of introducing a promoter additive were carried out. The effect of the introduction method and the nature of the promoting oxide additive on the properties of the active component of the Fischer-Tropsch synthesis catalysts was studied.

    Keywords: Fischer-Tropsch synthesis, catalyst, active component, silicate carrier, Al2O3 and ZrO2 promoters, TPV and TPD H2 methods, crystallite size, degree of reduction, dispersity

  • Modular design system of Orthodox temples

    By designing temples there is a question about the individuality of projects. When we speak about massive building of religious buildings, the development of new projects of temples is unprofitable in terms of saving time and money. It is proposed to use a modular system by temples’ designing. This system involves the creation of one temple project with variable architectural elements. From an economic point of view, the modular system is the optimal solution for the construction of temples.

    Keywords: temple architecture, modular system, space-planning solutions, architectural elements of the temple, religious buildings

  • The effect of modifying additives on the properties of the supported cobalt catalyst

    The physical and chemical properties of cobalt catalysts for Fischer-Tropsch synthesis have been studied. The effect of copper and iron oxides on the specific surface, pore volume and dimensions, and the degree of reduction of metallic cobalt on the surface of the Co-Al2O3 / SiO2 catalyst have been studied.

    Keywords: Fischer-Tropsch synthesis, synthetic hydrocarbons, catalyst, cobalt, promoter, carrier, specific surface, porous structure, catalytic activity, reduction degree

  • Cobalt-nickel catalysts for the synthesis of hydrocarbons on alumina carriers

    The dispersion parameters of the active component of cobalt catalysts promoted by nickel for Fischer-Tropsch synthesis by the temperature-programmed hydrogen desorption method (TPD H2) were studied. The influence of the polymorph (γ, θ, α) of the support on the physicochemical properties of the Co-Ni / Al2O3 catalyst was studied.

    Keywords: Fischer-Tropsch synthesis, biomass, catalyst, support, Ni promoter, polymorphic Al2O3 modifications, TPD H2 method, active surface, dispersity, cobalt crystallites