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  • Separate concreting in the manufacture of centrifuged reinforced concrete products

    When forming in the process of centrifugation an annular section by the method of ""separate"" concreting with the formation of a section of the product at the first stage from the original, including fine-grained concrete mixture, and with the introduction of a coarse aggregate at the second stage into the formed circular section, followed by the final formation of the section and compaction of the concrete mixture by centrifugation, the speed, calculated for the compaction stage, increases, depending on the section zone, the concrete compressive strength from 20% up to 47%, the initial modulus of elasticity from 6 to 19% relative to single-stage centrifugation. The ratio vint / vext of ultrasonic pulse velocities for surface sounding along the inner (vint) and outer (vext) faces of a centrifuged annular section can be considered as a conditional indicator of the uniformity of the concrete structure over the cross section of a centrifuged product. Key words: centrifugation, separate concreting, structure homogeneity, strength and deformation properties, porosity.

    Keywords: centrifugation, separate concreting, uniformity of structure, strength and deformation properties, porosity

  • Processing of spatial information about the boundaries of sanitary zones of waste landfills on the basis of fuzzy logic

    The method of application of fuzzy logic to solve the problem of spatial planning using geographic and information systems is described. The spatial arrangement of objects on the map is used as input factors of the solution, to find which a model of the spatial descriptions of objects using a bitmap representation is constructed. The way of formalizing fuzzy judgments about positional relationship of objects and the system of inference making based on the fuzzy logic methods is developed. An example of using the method described in this article to determine the sanitary protection zone of industrial waste landfill in the territory of the Republic of Bashkortostan is given

    Keywords: fuzzy logic, geographic information systems, the problem of territorial planning, disposal of industrial waste, protection zones

  • Calculation of the components on the hedging portfolio misunderstood markets with non-deterministic behavior of the buyers of shares.

    We consider a one-step part (B, S) - a market with an infinite number of states. The first part of the article deals with modeling of random behavior of an infinite number of aggressive buyers of the shares in the financial market. There will be described one way to exit the buyers of shares on the market, the gap between the announcement of the share price. In the second part of the article presents the procedure hedge payment obligation (bp), which uses interpolation of incomplete full-arbitrage market economies (Haar interpolation method).

    Keywords: Stochastic basis, financial market, martingale measure,the weakened property of the universal Haar uniqueness, self-financing portfolios, capital of portfolio, contingent claim.

  • Anomalous electron emission in the soft X-ray irradiation of the surface of electrets

     Theoretical model of anomalous electron emission has built for an soft x-ray irradiation of  surface elektrets, explaining the different character of correlation between energy and emission intensity of ferroelectric  solid solution PbTiO3 - CaTiO3 and nonferroelectric  ceramics CaTiO3.  Shown that  due electret surface irradiation the  Schottky area is  depleted by nonequilibrium charge carriers.

    Keywords: Emission, electret, ferroelectricity, Schottky area

  • Abstracts

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