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  • 1
    Electronic Resource
    Electronic Resource
    The application of the finite element method to solving Biot's consolidation equation (1982)
    Springer
    Applied mathematics and mechanics 3 (1982), S. 857-871 
    Details
    ISSN: 1573-2754
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Mathematics , Physics
    Notes: Abstract Biot's theory of consolidation of saturated soil, regards the consolidation process as a coupling problem between stress of elastic body and flow of fluid existing in pores[1]. It can more precisely reflect the mechanism of consolidation than Terzhigi's theory[2]. In this article, we obtain the general Biot's finite element equations of consolidation with classical variational principles. The equations have clear physical meaning and have been applied to analysing the consolidation of Bajiazui earth dam. The computational results are in accord with engineering practice.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01895341
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  • 2
    Electronic Resource
    Electronic Resource
    Mesityl-phosphorus compounds. Synthesis of a new iminomethylenephosphorane and its dimers (1983)
    s.l. : American Chemical Society
    Organometallics 2 (1983), S. 1406-1410 
    Details
    ISSN: 1520-6041
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/om50004a027
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  • 3
    Electronic Resource
    Electronic Resource
    The piston model of coronal transients (1984)
    Springer
    Astrophysics and space science 100 (1984), S. 391-406 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract In the present paper, the piston model of the coronal transient (see Hu. 1983a, b is discssed in detail, and the quantitative results of unsteady gasdynamics are applied to the coronal transient processes. The piston model explains the major features of the transient observations, such as the density profile, the geometric configuration, the kinetic process and the classifications of the coronal transient. Based on the idea of piston model, the bright feature and the dark feature of the transient are the gasdynamical response of the dense plasma ejecting into the corona, and associate with the compressed and rarefied flows, respectively. The quantitative results show that the density increment in the compressed region and the density decrement in the rarefied region are one order of magnitude larger and smaller, respectively, to the density in the quiet corona, it agrees quantitatively with the observations, and both the bright feature and dark feature are explained at the same time.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00651614
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  • 4
    Electronic Resource
    Electronic Resource
    On laminar bouudary layers with suction (1981)
    Springer
    Applied mathematics and mechanics 2 (1981), S. 463-480 
    Details
    ISSN: 1573-2754
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Mathematics , Physics
    Notes: Abstract In this paper, we obtain the asymptotic solution of the general equation for laminar boundary-layer flows with suction. Formulae for calculating the displacement thickness, momentum thickness, and skin friction are then derived. Furthermore, the problem of determining the separation point is dealt with. Finally, as a numerical example, we compute certain characteristic boundary-layer parameters for the case of uniform flow over a flat plate with constant suction. Our numerical results obtained are in good agreement with those of Iglisch.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01875922
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  • 5
    Electronic Resource
    Electronic Resource
    One-dimensional piston process in strong gravitational field (1984)
    Springer
    Applied mathematics and mechanics 5 (1984), S. 1803-1811 
    Details
    ISSN: 1573-2754
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Mathematics , Physics
    Notes: Abstract In this paper, the dynamic process driven by one-dimensional piston in strong gravitational field was studied on the Cartesian, cylinderical and spherical coordinates. The gasdynamic equations were numerically solved by the characteristic method. The solution which satisfies the velocity condition at piston and the boundary conditions connect the flow region and the quiet region is obtained. The present paper analyses especially the influence of coordinate systems on the field of compressible flow, uniform flow and rarefaction flow region, the shock velocity and the temperature distribution at the piston.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01904924
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  • 6
    Electronic Resource
    Electronic Resource
    A mixed explicit-implicit antidiffusive method of navier-stokes equations for supersonic and hypersonic separated flows (1983)
    Springer
    Applied mathematics and mechanics 4 (1983), S. 55-68 
    Details
    ISSN: 1573-2754
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Mathematics , Physics
    Notes: Abstract The supersonic and hypersonic, laminar and turbulent viscous separated flows over two and three-dimensional compression corners are solved by the antidissipative explicit-implicit difference scheme presented in this paper. The results obtained show that a high accuracy has been achieved by this method and the time needed for computation is greatly reduced.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01896713
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  • 7
    Electronic Resource
    Electronic Resource
    The linear growth of the density wave in galaxies (1983)
    Springer
    Applied mathematics and mechanics 4 (1983), S. 247-252 
    Details
    ISSN: 1573-2754
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Mathematics , Physics
    Notes: Abstract The aim of this article is to study the linear growth of the density wave in galaxies by means of numerically resolving unsteady, two-dimensional hydrodynamic equations coupled with Poisson equation under the condition that the local asymptotic solution of linear density wave is given as an initial value. The results show that the perturbed peak density of linear density wave grows to the same order as the basic state density during merely tens of million years, the spiral pattern emerging which has barred structure in its inner region. The angular velocity of the spiral pattern and the growth rate of perturbed density vary gradually with changes in spatial place and time. The approximate property of quasistationary spiral structure hypothesis is discussed in this paper.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01895448
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  • 8
    Electronic Resource
    Electronic Resource
    On the finite displacement problem of a hollow cylinder under internal and external pressures (1984)
    Springer
    Applied mathematics and mechanics 5 (1984), S. 1557-1570 
    Details
    ISSN: 1573-2754
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Mathematics , Physics
    Notes: Abstract Using the method of successive approximations we find of this boundary-value problem the first-and second-order solutions. And then we obtain the formulae in the second approximation for the displacement, strain, and stress fields. Also, our results show that after deformation (i) a cross-section of the cylinder must be displaced into a plane section perpendicular to the central axis of the cylinder; and (ii) neither the sum of the strain components E RR (2) and E ϕϕ (2) nor the sum of the stress components E RR (1) and E ΦΦ (1) maintains contant throughout the cylinder. The latter effect, which is absent from classical elasticity, bears respensibility for the presence of the E ZZ (1) . Moreover, there exhibits a linear relation between E ZZ (1) and (E RR (2) +E OO (1) ), with the proportionality coefficients depending only on the material of the cylinder.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01910447
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  • 9
    Electronic Resource
    Electronic Resource
    Some new concepts on the nature of the covalent bond based on ab initio quantum-chemical calculations (1983)
    New York, NY : Wiley-Blackwell
    International Journal of Quantum Chemistry 23 (1983), S. 1945-1958 
    Details
    ISSN: 0020-7608
    Keywords: Computational Chemistry and Molecular Modeling ; Atomic, Molecular and Optical Physics
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The ground states of eight molecules and some of their hole states are calculated. The calculations are performed on a medium-size home-made computer using self-written programs. The basis set used is LEMAO-3G, with scaling factors of the orbitals optimized by means of a method using orthogonal array and finding minima of fitted quadric curves. The conclusions are: (1) The LCAO-MO method is the reflection of the interference effect due to the wave nature of electrons. (2) The mathematical methods of rescaling the orbital exponents is the reflection of the orbital contraction or diffusion occurring during the formation of MO. These conclusions are in agreement with the Virial theorem and the variation principle. They are also strongly supported by the photoelectron spectroscopy data. The calculated values of the energies of the valence orbitals are very near to those obtained by using some extended basis set, which are reported to be very close to the Hartree-Fock limits. From these results and discussions it may be concluded that the nature of the covalent bond should be considered as an interplay and mutual conditioning between the wave nature of the electronic motion on the one hand and the various attractive and repulsive factors on the other hand, among which the kinetic energy should be a very important repulsive factor. The mutual screening effects of the electrons in various MOS, which are different for different molecules, are also very important. This is perhaps one of the main causes of the differences in properties of different molecules.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/qua.560230608
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  • 10
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    High-Energy Electron Production by the Raman and2ωpeInstabilities in a 1.064-μm-Laser-Produced Underdense Plasma (1982)
    American Physical Society
    Details
    Publication Date: 1982-11-08
    Print ISSN: 0031-9007
    Electronic ISSN: 1079-7114
    Topics: Physics
    Published by American Physical Society
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