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  • Electronic Resource  (4)
Material
  • Electronic Resource  (4)
Years
  • 1
    ISSN: 1520-6904
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Ground water 33 (1995), S. 0 
    ISSN: 1745-6584
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Geosciences
    Notes: Sheet piles are used to lower the water table that exists downstream of a sheet pile. Under certain conditions of the upstream water heads and sheet pile embedment depths, a free boundary in the form of the water table may occur on the downstream. This free boundary is not known a priori and must be determined as a part of the solution; to make this possible, additional boundary conditions need to be satisfied on the free boundary. Analytical solutions are readily available for the location of such water tables, but with the impervious bottom located at infinite depth and for rectilinear boundary geometry. In the present study, the location of the water table downstream of a sheet pile with the impervious bottom located at finite depth is obtained using Finite-Element Method (FEM). An experimental solution using electrical analogy is attempted to validate the solution obtained using FEM. Parametric studies are also carried out to study the various parameters affecting the location of the water table.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Biotechnology letters 18 (1996), S. 1391-1394 
    ISSN: 1573-6776
    Source: Springer Online Journal Archives 1860-2000
    Topics: Process Engineering, Biotechnology, Nutrition Technology
    Notes: Summary Resolution of alkyn-3-ols has been achieved using a lipase from Candida rugosa to esterify the alcohols with trifluoroethyl butyrate in hexane to give the (S)-alcohols and the (R)-esters. Subsequent reacylation of the product alcohols and alcoholysis of the esters with 1-butanol furnished the (S)-alcohols with good (86–91% ees) and the (R)-butyrate with moderate enantiomeric purities (62–64% ees).
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Chichester : Wiley-Blackwell
    International Journal for Numerical Methods in Fluids 22 (1996), S. 375-392 
    ISSN: 0271-2091
    Keywords: gates ; finite elements ; potential flow ; free surface ; Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Two-dimensional finite element analyses of two types of gate - (i) a conduit gate with pressure flow upstream of the gate and free surface flow downstream of the gate and (ii) a sluice gate with free surfaces both upstream and downstream of the gate - are done using ideal fluid theory. The conduit gate problem is solved using both Φ- and Ψ- formulations. Various methods of satisfying the boundary conditions were tested for both formulations. The ψ-formulation developed in the present study is found to converge faster for flows with Froude numbers less than 4, which are common in sluice gates. The results obtained from the present study are compared with results from analytical and experimental techniques available in the literature. The ψ-formulation developed in the present study is then used to solve the spillway gate problem, for which no analytical solution is available.
    Additional Material: 14 Ill.
    Type of Medium: Electronic Resource
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