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  • 1
    Electronic Resource
    Electronic Resource
    Proton nuclear magnetic resonance studies of the effects of ligand binding on tryptophan residues of selectively deuterated dihydrofolate reductase from Lactobacillus casei (1980)
    s.l. : American Chemical Society
    Biochemistry 19 (1980), S. 2316-2321 
    Details
    ISSN: 1520-4995
    Source: ACS Legacy Archives
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/bi00552a006
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  • 2
    Electronic Resource
    Electronic Resource
    Fluorine-19 nuclear magnetic resonance studies of ligand binding to 3-fluorotyrosine- and 6-fluorotryptophan-containing dihydrofolate reductase from Lactobacillus casei (1977)
    s.l. : American Chemical Society
    Biochemistry 16 (1977), S. 3492-3500 
    Details
    ISSN: 1520-4995
    Source: ACS Legacy Archives
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/bi00634a032
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  • 3
    Electronic Resource
    Electronic Resource
    Dimethyl 2-Iodobenzoylphosphonate, an Unusual Example of a Crystalline α-Ketophosphonate (1997)
    Oxford [u.a.] : International Union of Crystallography (IUCr)
    Acta crystallographica 53 (1997), S. 1462-1464 
    Details
    ISSN: 1600-5759
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0108270197006252
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  • 4
    Electronic Resource
    Electronic Resource
    Proximity of two tryptophan residues in dihydrofolate reductase determined by 19 F NMR (1978)
    [s.l.] : Nature Publishing Group
    Nature 271 (1978), S. 184-185 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Fig. 1 a, The proton noise-decoupled 19F NMR spectrum at 94.1 MHz of a 1 mM solution of 6-fluorotryptophan-labelled dihydrofolate reductase in the presence of 1 equivalent of methotrexate and 1 equivalent of NADPH. The sample was examined as a D2O solution containing 50 mM potassium phosphate, 500 ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/271184a0
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  • 5
    Electronic Resource
    Electronic Resource
    Computation of collapse loads in geomechanics by finite elements (1989)
    Springer
    Archive of applied mechanics 59 (1989), S. 237-244 
    Details
    ISSN: 1432-0681
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Übersicht Das neuerliche Interesse an Verzweigung und Lokalisierung in der Bodenmechanik hat zu einer Überprüfung traditioneller Kollaps-Berechnungen nach der Finite-Element-Methode geführt. Hier werden vom praktischen Standpunkt einige wichtige Aspekte dieser Berechnungsmethode besprochen. Beispiele zur Versagensvorhersage bei der Tragfähigkeit und Hangstabilität von entfestigendem Material werden vorgestellt. Es wird gezeigt, daß lokalisierte Scherverformungen ohne Kunstgriffe mit nachgiebigeren Elementen oder erzwungenen Verschiebungsfeldern modelliert werden können.
    Notes: Summary Recent interest in bifurcation and localisation in geomechanics has led to a re-examination of traditional collapse calculations using finite element methods. This paper reviews some of the important aspects of calculations of this type from a practical viewpoint. Examples of collapse predictions in applications of both bearing capacity and slope stability with strain softening are presented. It is shown that localised zones of shear deformation can be modelled without any artificial inducements such as weak elements or applied displacement fields.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00532253
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  • 6
    Electronic Resource
    Electronic Resource
    Comparison of the pseudo-static and dynamic behaviour of gravity retaining walls (1996)
    Springer
    Geotechnical and geological engineering 14 (1996), S. 269-290 
    Details
    ISSN: 1573-1529
    Keywords: pseudo-static analysis ; gravity retaining wall ; earthquake ; dynamic finite element analysis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Summary Pseudo-static and dynamic non-linear finite element analyses have been performed to assess the dynamic behaviour of gravity retaining walls subjected to horizontal earthquake loading. In the pseudo-static analysis, the peak ground acceleration is converted into a pseudo-static inertia force and applied as a horizontal incremental gravity load. In the dynamic analysis, an actual measured earthquake acceleration time history has been scaled to provide peak ground acceleration values of 0.1 g and 0.3 g. Good agreement is obtained between the pseudo-static analysis and analytical methods for the calculation of the active coefficient of earth pressure. However, the results from the dynamic analysis require careful interpretation. In the pseudo-static analysis, the increase in the point of application of the resultant active force with the horizontal earthquake coefficient k h from the one-third point to the mid-height of the wall is clearly observed. In the dynamic analysis, the variation in the point of application is shown to be a function of the type of wall deformation. Both finite element analyses indicate the importance of determining the magnitude of the predicted displacements when assessing the behaviour of the wall to seismic loading.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00421944
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  • 7
    Electronic Resource
    Electronic Resource
    Stiffness matrix of the four-node quadrilateral element in closed form (1994)
    Chichester [u.a.] : Wiley-Blackwell
    International Journal for Numerical Methods in Engineering 37 (1994), S. 1027-1038 
    Details
    ISSN: 0029-5981
    Keywords: Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mathematics , Technology
    Notes: The stiffness matrix of a plane four-node quadrilateral finite element is given in closed form. When expressed as a FORTRAN subroutine and compared with the classical method of forming the stiffness matrix using Gaussian integration, the approach gives a CPU time speed-up of the order of 2-3 on a vector machine and of the order of 4-5 on a scalar machine. The technique used to generate the terms of the stiffness matrix made use of a computer algebra system which could clearly be extended to generate the matrices for other elements types.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/nme.1620370609
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  • 8
    Electronic Resource
    Electronic Resource
    Generalized numerical integration of moments (1991)
    Chichester [u.a.] : Wiley-Blackwell
    International Journal for Numerical Methods in Engineering 32 (1991), S. 129-147 
    Details
    ISSN: 0029-5981
    Keywords: Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mathematics , Technology
    Notes: Sampling points and weighting coefficients of the Gaussian type are presented for integrands typically encountered in axisymmetric finite elements. The proposed method is a generalization of Gaussian Integration of Moments for non-zero limits of integration. The method achieves one extra order of accuracy in the integration of polynomials as compared with the Gauss-Legendre method with the same number of sampling points. Although the locations of sampling points require the solution of non-linear equations, analytical solutions are presented for the cases of one and two sampling points. Special cases of these general expressions are shown to include both Gauss-Legendre integration corresponding to an integration range at a considerable distance from the axis of symmetry, and Fishman integration corresponding to an integration range whose lower limit lies on the axis of symmetry.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/nme.1620320108
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  • 9
    Electronic Resource
    Electronic Resource
    Letters to the editor (1983)
    New York, NY [u.a.] : Wiley-Blackwell
    International Journal for Numerical and Analytical Methods in Geomechanics 7 (1983), S. 385-393 
    Details
    ISSN: 0363-9061
    Keywords: Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Architecture, Civil Engineering, Surveying , Geosciences
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/nag.1610070309
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  • 10
    Electronic Resource
    Electronic Resource
    The properties of anisotropic conical failure surfaces in relation to the Mohr-Coulomb criterion (1988)
    New York, NY [u.a.] : Wiley-Blackwell
    International Journal for Numerical and Analytical Methods in Geomechanics 12 (1988), S. 497-504 
    Details
    ISSN: 0363-9061
    Keywords: Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Architecture, Civil Engineering, Surveying , Geosciences
    Notes: An earlier publication1 considered the properties of circular conical failure surfaces whose axes coincide with the space diagonal in principal stress space. The present work uses a similar approach to analyse conical surfaces that are offset from the space diagonal. It is shown that cones fitted to the Mohr-Coulomb surface in triaxial compression contain a potential singularity. The occurrence and location of the singularity depends on the Mohr-Coulomb friction angle to which the surface is fitted in triaxial extension. It is shown that for a cone fitted to the same friction angle in both triaxial extension and compression, singular conditions occur when that angle reaches \documentclass{article}\pagestyle{empty}\begin{document}$ \sin ^{ - 1} \left({\sqrt 7 - 2} \right)\left({ = 40.22^\circ } \right) $\end{document}. Even cones fitted to smaller friction angles give significant overestimations of material strength for certain stress paths.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/nag.1610120504
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