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  • 1
    Electronic Resource
    Electronic Resource
    Stability of a deflagration front in compressible media (1995)
    Springer
    Zeitschrift für angewandte Mathematik und Physik 46 (1995), S. 328-338 
    Details
    ISSN: 1420-9039
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Physics
    Notes: Abstract A two-dimensional linear analysis of the planar flame front stability for a compressible fluid is presented. The analysis shows that there are two types of perturbations. The first type, corresponding to waves in incompressible media, has already been studied by Landau. It predicts absolute instability of the flame front. The second type of perturbations is due to fluid compressibility and the dependence on upstream flow parameters of the flame front velocity. Three different regimes for these perturbations are possible: stable, acoustically unstable, and absolutely unstable. The instability results in a pronounced pressure wave generation. A one-dimensional analysis of the interaction of the flame front with flow boundaries is performed. Under some circumstances, this interaction is shown to cause exponential growth of the perturbations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01003553
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  • 2
    Electronic Resource
    Electronic Resource
    Soil organic matter quantity and quality in mountain soils of the Alay Range, Kyrgyzia, affected by land use change (2000)
    Springer
    Biology and fertility of soils 31 (2000), S. 407-413 
    Details
    ISSN: 1432-0789
    Keywords: Key words Soil organic matter ; Mountain soils ; Land use ; Deforestation ; Soil management
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract  Changes in soil management practices influence the amount, quality and turnover of soil organic matter (SOM). Our objective was to study the effects of deforestation followed by pasture establishment on SOM quantity, quality and turnover in mountain soils of the Sui Checti valley in the Alay Range, Kyrgyzia. This objective was approached by analysis of total organic C (TOC), N, lignin-derived phenols, and neutral sugars in soil samples and primary particle-size soil fractions. Pasture installation led to a loss of about 30% TOC compared with the native Juniperus turkestanica forests. The pasture soils accumulated about 20% N, due to inputs via animal excrement. A change in land use from forest to pasture mainly affected the SOM bound to the silt fraction; there was more microbial decomposition in the pasture than in the forest silt fraction, as indicated by lower yields of lignin and carbohydrates, and also by a more advanced oxidative lignin side-chain oxidation and higher values of plant : microbial sugar ratios. The ratio of arabinose : xylose was indicative of the removal of carbohydrates when the original forest was replaced by pasture, and we conclude that this can be used as an indicator of deforestation. The accumulation of lignin and its low humification within the forest floor could be due to the extremely cold winter and dry summer climate.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003749900187
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  • 3
    Electronic Resource
    Electronic Resource
    Effects of deforestation on phosphorus pools in mountain soils of the Alay Range, Khyrgyzia (2000)
    Springer
    Biology and fertility of soils 31 (2000), S. 134-142 
    Details
    ISSN: 1432-0789
    Keywords: Key words Effects of deforestation ; Mountain soil ; Particle-size fractionation ; Phosphorus fractionation ; Phosphorus pools
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract  The amount, quality and turnover of soil P is heavily influenced by changes in soil management. The objective of this study was to investigate the effects of deforestation and pasture establishment on the concentrations, forms and turnover rate of soil P in mountain soils of the Alay Range, Khyrgyzia. A sequential extraction was applied to distinguish soil P pools. We used particle-size fractionation to follow the dynamics of different P pools in soils under forest and pasture and 31P-NMR spectroscopy to investigate the structure of alkali-soluble P forms. In the A horizons of the forest soils, total soil P concentration was 1093 mg kg–1, organic P (Po) representing 46% of the total P. Deforestation followed by pasture establishment not only increased significantly (P〈0.01) the total P concentration (1560 mg kg–1) but also the contribution of Po to total P was increased by 17%. Pasture soils had significantly higher P pools than forest soils except highly labile inorganic P (Pi NaHCO3) and primary Pi (Pi HCldil). Both in forest and pasture soils stable P increased with decreasing particle size (coarse sand 50%, clay 80% of total P) and primary P decreased with decreasing particle size. Phosphate monoesters and diesters represented 80% of P identified by 31P NMR. Low monoester to diester ratios in the alkali extracts of forest and pasture soils indicate low microbial activity. This is consistent with high C/Po ratios and high stable Po concentrations in the fine earth of forest and pasture.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003740050636
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  • 4
    Electronic Resource
    Electronic Resource
    Structure of completely dispersed shock waves in relaxing mixtures (1979)
    Springer
    Journal of applied mechanics and technical physics 20 (1979), S. 170-181 
    Details
    ISSN: 1573-8620
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00910017
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  • 5
    Electronic Resource
    Electronic Resource
    Structure of relaxation zones behind a shock front in chemically active gas mixtures (1980)
    Springer
    Journal of applied mechanics and technical physics 21 (1980), S. 29-39 
    Details
    ISSN: 1573-8620
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00910135
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  • 6
    Electronic Resource
    Electronic Resource
    Nonlinear near-resonance oscillations of a gas in a tube of variable cross section (1985)
    Springer
    Journal of applied mechanics and technical physics 26 (1985), S. 397-401 
    Details
    ISSN: 1573-8620
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00910377
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  • 7
    Electronic Resource
    Electronic Resource
    Nonlinear subresonance oscillations of a gas in a pipe under the influence of periodically varying pressure (1988)
    Springer
    Fluid dynamics 23 (1988), S. 284-290 
    Details
    ISSN: 1573-8507
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract A study is made of one-dimensional nonlinear oscillations of an ideal gas in a pipe one end of which is closed, the pressure being given at the other end and periodically varying with the time. For frequencies close to the subresonance ones, asymptotic equations are obtained which govern the periodic motions of the gas. Solutions containing shock waves are constructed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01051901
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  • 8
    Electronic Resource
    Electronic Resource
    Equations of transonic flows of relaxing mixtures (1977)
    Springer
    Fluid dynamics 12 (1977), S. 599-606 
    Details
    ISSN: 1573-8507
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Transonic flows of chemically active gas mixtures whose composition is defined by an arbitrary number of reactions are considered. Conditions ensuring a closeness of the frozen and equilibrium velocities of sound are imposed on the equations of state. An approximate system of equations for vectors of particle velocity and completeness of reactions is obtained as a result of an asymptotic analysis of the system of Euler equations and the equations of chemical reactions associated with them. This system reduces to two equations containing only components of the particle velocity; the order of one of them equals the number of reactions increased by one, while the second equation expresses the nonvorticity condition of the stream. Various limit cases dependent on the magnitude of eigenvalues of the relaxation matrix are pointed out.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01089683
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  • 9
    Electronic Resource
    Electronic Resource
    Numerical modeling of the action of an explosion on an iron slab (1983)
    Springer
    Combustion, explosion and shock waves 19 (1983), S. 239-246 
    Details
    ISSN: 1573-8345
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Conclusions 1. Numerical modeling of the loading of an iron slab by an explosion showed that the simple kinetic relationship proposed for the fracture computation will assure a realistic description of the fracture process. 2. A detailed description of the fracture can be achieved only with the influence of the magnitude of the strain on the strength properties of the material taken into account. 3. It is shown that the progress of a reversible polymorphic transformation in the specimen material substantially influences the nature of its fracture by explosion. The authors are deeply grateful to F. I. Dubovitskii for formulating the problem and sustaining the investigations and to M. F. Ivanov for aid in the research.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00789248
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