№ 74(10), December, 2011
Public date: 30.12.2011
Archive of journal: Articles count 76, 142 kb
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01.00.00 Physical-mathematical sciences
01.00.00 Physical-mathematical sciences
Description
Forecasting method of flow discharge on the reach of the mountain-flat river channel based on water balance equation and stochastic forecasting model of flood situation in a hydrometric section line of river canal is described. The results of test calculations executed for a reaches of the river Kuban are presented
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ANALYSIS OF METHODS OF GENERATION OF TIME SERIES WITH LONG-TERM CORRELATION STRUCTURE
01.00.00 Physical-mathematical sciences
Description
This article gives a comparative analysis of six modeling techniques of fractal differential noise, including: direct definition method, the method of Hosking, the method of Davis and Hart's, the circulant embedding method, Paxson method and method of spectral simulation. Furthermore, the algorithms are given for the analysis and the method of estimation of Hurst`s parameter is selected, this method is the main criterion of quality when comparing the above mentioned methods of fractal differential noise
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COMPARATIVE ASSESSMENT OF FUNGICIDES OF NEW GENERATIONS TOXIC TO DAPHNIA
Description
We have assessed the effect of the new generations of fungicides on the vital activity of daphnia. The data of the chronic experiment allowed us to determine non-effective and threshold concentrations of the substances studied. The toxic effect of the xenobiotics is shown to be of different intensity. When entering water they may be dangerous, first of all, for the zooplankton that is the food base of young fish, and may have unfavorable effects on fish development
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04.00.00 Geological-mineralogical sciences
04.00.00 Geological-mineralogical sciences
Description
This article discusses results of hydrogeological study including morphometric terrain analysis of irrigation systems of Syrt Plain. The author of this article tries to prove that irrigation of chestnut soil in Syrt Plain can be achieved without employing regular drainage systems by citing the example of long-term irrigation system employed by experimental station in the town of Ershov
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THE FILTRATION PROPERTIES FEATURES OF TECHNOGENIC DEPOSITS
04.00.00 Geological-mineralogical sciences
Description
The studies of synthetic sand deposits formed after working dredges deposits in river valleys, have established significant heterogeneity of filtration properties of elementary layers of sand of different grain size distribution. The features of the structure of the array of man-made structures provide a large capacity of absorption of suspended clay particles and the conditions for water purification by adsorption
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Description
Methods of jet pneumatic automatics as applied (Pneumatic automation) to systems of transportation on an air pillow are considered. Use of methods pneumatic automation is shown at designing the flowing channels providing jet management on the basis of aero hydrodynamic effects. On the basis of hydro dynamical calculation parities for definition in engineering calculations of critical values of characteristics of flowing elements of the pneumoconveyor are determined. Time of transient of system of switching of air streams is determined
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MATHEMATICAL MODEL OF MANAGEMENT OF SCRAP PROCESS OF CRONES OF TREES BY MANIPULATOR WITH A DISK SAW
Description
In this article, the mathematical model of management of interaction of working body of the cutter with branches of trees is submitted. Optimization of design data of the machine for scrap of trees is executed
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ANALYSIS OF PROCESS OF DESTRUCTION OF ROCKS WITH A CHISEL АT DRILLING OF BORE HOLES
Description
Тhe physical processes, arising on a face at interaction of a chisel with rocks are considered. The mathemati-cal description of model of mechanical speed of drill-ing in a function from speed of rotation, twisting mo-ment, diameter of a chisel and properties of destroyed rocks is executed
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MATHEMATICAL MODEL OF VIBRATION CONTROL PROCESS OF UNDERCUTTING ROOTS OF SEEDLINGS OF FOREST CROPS
Description
The article presents a mathematical model of the interaction of vibration control the working body of the roots carver with soil and plant roots to optimize the design parameters roots carver
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PHYSICAL AND MECHANICAL PROPERTIES OF NANOMODIFIED "POOR" CONCRETE ROAD CLOTHING BASE CREATION
Description
The experimental data of the study of physical and mechanical properties of nanomodified "poor" concrete for road clothing base creation is presented in this article
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