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  • 1995-1999  (22)
  • 1990-1994  (27)
  • 1870-1879
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  • 1
    Electronic Resource
    Electronic Resource
    Structural Basis for the Catalytic Activity of Aspartate Aminotransferase K258H Lacking the Pyridoxal 5'-Phosphate-Binding Lysine Residue (1995)
    s.l. : American Chemical Society
    Biochemistry 34 (1995), S. 405-414 
    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/bi00002a004
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  • 2
    Electronic Resource
    Electronic Resource
    Damping of the oscillations of a permanent magnet levitating between high-Tc superconductors (1995)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 67 (1995), S. 2400-2402 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A permanent magnet (spherical shape, radius 100 μm) is levitating inside a superconducting parallel plate capacitor made of YBCO. Translational oscillations of the magnet at its resonance frequency (∼150 Hz) can be excited and detected. The damping of the oscillations is investigated as a function of temperature and oscillation amplitude. Close to Tc we observe a steep minimum of the damping. The data can be described by a linear frictional force which decreases near Tc, and a quadratic one which diverges at Tc. These frictional forces are attributed to flux flow phenomena in the high-Tc superconductor. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.114560
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  • 3
    Electronic Resource
    Electronic Resource
    Determination of RNA Structure and Thermodynamics (1993)
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Biochemistry 62 (1993), S. 255-285 
    Details
    ISSN: 0066-4154
    Source: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Topics: Chemistry and Pharmacology , Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1146/annurev.bi.62.070193.001351
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  • 4
    Electronic Resource
    Electronic Resource
    Collision age (1995)
    [s.l.] : Nature Publishing Group
    Nature 375 (1995), S. 286-286 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] SIR - Beck et al.1 have reported new bio-geographical data, concluding that the collision of the Indian subcontinent with Asia was older than previously claimed. They suggested that the collision occurred between 66 and 55.5 Myr (million years) ago. However, palaeontological ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/375286c0
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  • 5
    Electronic Resource
    Electronic Resource
    Continuous diffuse scattering from polymethylene chains – an electron diffraction study of crystalline disorder (1991)
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 47 (1991), S. 543-549 
    Details
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: Continuous diffuse scattering is noted in electron diffraction patterns from polymethylene compounds such as n-paraffins and polyethylene. In a projection down the chain axes, experimentally produced by solution crystallization, the diffuse scatter in hk0 patterns disappears at low temperature, in accord with a thermal-diffuse-scattering model, which explains the intensity distribution and its temperature dependence. For a projection onto the chain axes, experimentally achieved by epitaxic orientation on benzoic acid crystals, the 0kl, as well as 3D projections, contain diffuse scatter which does not disappear at low termperature. Its origin appears to be due to frozen-in longitudinal chain static displacements, perhaps as much as 0.25 Å, as indicated by a model for this disorder.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0108767391003823
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  • 6
    Electronic Resource
    Electronic Resource
    Axi-symmetric bodies of equal material in contact under torsion or shift (1995)
    Springer
    Archive of applied mechanics 65 (1995), S. 478-487 
    Details
    ISSN: 1432-0681
    Keywords: Key words Contact problem of elasticity ; superposition ; flat punch solutions ; annular sliding ; stick area.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Summary  Two axi-symmetric bodies are pressed together, so that their axes of symmetry coincide with the contact normal and the normal force is held constant. A small torque about the contact normal or a small tangential force is applied. For bodies of equal material, the normal and tangential stress states are uncoupled, and can be solved separately. The surfaces of the bodies are thought as a superposition of infinitesimal rigid flat-ended punches. Consequently, the normal stress distribution can be calculated as a summation of differential flat punch solutions. A formula results, which is identical with the solution of Green and Collins. After application of a torque an annular sliding area forms at the border of the contact area. For reasons of symmetry, the common displacement of the inner stick area must be a rigid body rotation. Similarly to the normal problem, the solution can be thought as a superposition of rigid punch rotations. The tangential solution can be derived analogically, in form of a superposition of rigid punch displacements. The present method also solves the problem of simultaneous normal and torsional or tangential loading with complete adhesion. As an example, Steuermann’s problem for polynomial surfaces of the form A 2 n r2 n is solved. The solutions for constant normal forces can be used as basic functions for loading histories with varying normal and tangential forces.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00835661
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  • 7
    Electronic Resource
    Electronic Resource
    Uniaxial deformation of a random packing of particles (1999)
    Springer
    Archive of applied mechanics 69 (1999), S. 181-203 
    Details
    ISSN: 1432-0681
    Keywords: Key words granular material ; generalized Hertz contact ; elastic friction ; nonlinear elasticity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Summary Mechanical behavior of dense packing spheres with small irregularities is investigated in this paper. A generalization of the hertzian contact model for surfaces of the form x k yields a normal contact force F n , which is proportional to ζ1+1/ k , with the normal displacement ζ. For oblique forces, the frictional force can be calculated, [10]. Different load cases are explained in detail. It is shown that the stress-strain curve during initial loading of the packing is identical with the force-displacement relation at the contact point, using an appropriate constant. The results for uniaxial loading, unloading and reloading are illustrated. As experimentally observed, the axial pressure in unloading is smaller than during loading, while the lateral pressure increases. The stress-strain relation is compared with well-known empirical relations of rock and soil mechanics, and the wave velocity for spherical irregularities agrees with earlier geomechanical theories for random packing of smooth spheres.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004190050213
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  • 8
    Electronic Resource
    Electronic Resource
    Half-planes without coupling under contact loading (1997)
    Springer
    Archive of applied mechanics 67 (1997), S. 247-259 
    Details
    ISSN: 1432-0681
    Keywords: Key words uncoupled contact ; plane elasticity ; Cattaneo-Mindlin principle ; elastic friction ; singular integrals.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Summary Nonrotating half-planes in contact under oblique loading are investigated in this paper. The solution is based on the influence integrals of the Flamant solution. The problem is determined by two integral equations for the normal and tangential stresses, which are uncoupled for special cases, as bodies of similar material in contact. In order to simplify the singular integrals, the method of superposition of flat punches is used. The result for the symmetric case is almost identical with the axisymmetric solution. For polynomial profiles of the form x s , the Muskhelishvili potentials can be written in terms of a complex hypergeometric function. The interior stress field is illustrated for an example.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004190050115
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  • 9
    Electronic Resource
    Electronic Resource
    Axi-symmetric bodies of equal material in contact under torsion or shift (1995)
    Springer
    Archive of applied mechanics 65 (1995), S. 478-487 
    Details
    ISSN: 1432-0681
    Keywords: Contact problem of elasticity ; superposition ; flat punch solutions ; annular sliding ; stick area
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Summary Two axi-symmetric bodies are pressed together, so that their axes of symmetry coincide with the contact normal and the normal force is held constant. A small torque about the contact normal or a small tangential force is applied. For bodies of equal material, the normal and tangential stress states are uncoupled, and can solved separately. The surfaces of the bodies are thought as a superposition of infinitesimal rigid flat-ended punches. Consequently, the normal stress distribution can be calculated as a summation of differential flat punch solutions. A formula results, which is identical with the solution of Green and Collins. After application of a torque an annular sliding area forms at the border of the contact area. For reasons of symmetry, the common displacement of the inner stick area must be a rigid body rotation. Similarly to the normal problem, the solution can be thought as a superposition of rigid punch rotations. The tangential solution can be derived analogically, in form of a superposition of rigid punch displacements. The present method also solves the problem of simultanous normal and torsional or tangential loading with complete adhesion. As an example, Steuermann's problem for polynomial surfaces of the formA 2nr2nis solved. The solutions for constant normal forces can be used as basic functions for loading histories with varying normal and tangential forces.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00835661
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  • 10
    Electronic Resource
    Electronic Resource
    Torsional impact of elastic spheres (1994)
    Springer
    Archive of applied mechanics 64 (1994), S. 235-248 
    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 In diesem Artikel wird der Stoß zweier geometrisch und materiell ähnlicher Kugeln untersucht, welche um die gemeinsame Normale ihres Kontaktgebietes rotieren. Die Lösung des statischen Kontaktproblems, bei welchem die Kugeln durch eine konstante Normalkraft zusammengedrückt und anschließend durch ein monoton steigendes Torsionsmoment um die Kontaktnormale belastet werden, wurde von Lubkin gefunden. Die Überlagerung der Lubkin-Funktionen für unterschiedliche Kontaktgebiete ergibt das allgemeine Kontaktgesetz für eine Folge endlicher Normalverschiebungs-und Torsionsinkremente. Die Drehung am Stoßende erhält man durch numerische Integration der Drallgleichung und des Kontaktgesetzes. Die Nassi-Shneiderman-Diagramme des Kontaktalgorithmus und des Stoßprogramms werden abgebildet. Einige Ergebnisse werden vorgestellt und mit einer asymptotischen Theorie für vollständiges Haften und vollständiges Gleiten verglichen.
    Notes: Summary In this article, the collison of two geometrically and materially similar elastic spheres, which are rotating around the common normal of their contact area, is analysed. The solution of the static problem, when the spheres are pressed together by a constant normal force and are then subjected to a monotonously increasing torsional couple about the contact normal, has been found by Lubkin. Superposition of Lubkin's solutions for varying contact areas yields the general contact law for finite sequences for normal and torsional displacement increments. The torsional rotation at the end of impact is obtained from numerical integration of the angular equation of motion and the contact law. The Nassi-Shneiderman diagrams of the contact algorithm and the impact algorithm are presented. Some results are plotted and compared with an asymptotic theory for complete adhesion and complete sliding in the contact area.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00789122
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