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  • 1
    Electronic Resource
    Electronic Resource
    Numerical analysis of a hot-strip rolling problem with Coulomb-Siebel friction (1998)
    Bradford : Emerald
    Engineering computations 15 (1998), S. 1000-1010 
    Details
    ISSN: 0264-4401
    Source: Emerald Fulltext Archive Database 1994-2005
    Topics: Technology
    Notes: An isothermal, steady-state, hot-strip rolling problem for rigid-plastic, strain rate sensitive and incompressible materials with coulomb-siebel friction contact conditions is considered. The corresponding penalty variational statement is given and a convergent finite element - secant-modulus method is presented. Two-dimensional example problems are solved and comparisons with the available experimental and numerical results are made. The influence of the friction coefficient on the contact velocities, stresses and equivalent strain rates is illustrated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1108/02644409810244101
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  • 2
    Electronic Resource
    Electronic Resource
    Performances of the central L3 Data Acquisition system
    Amsterdam : Elsevier
    Nuclear Instruments and Methods in Physics Research Section A: 306 (1991), S. 536-539 
    Details
    ISSN: 0168-9002
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0168-9002(91)90048-U
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Studies of hadronic event structure and comparisons with QCD models at theZ 0 resonance (1992)
    Springer
    The European physical journal 55 (1992), S. 39-61 
    Details
    ISSN: 1434-6052
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The structure of hadronic events fromZ 0 decay is studied by measuring event shape variables, factorial moments, and the energy flow distribution. The distributions, after correction for detector effects and initial and final state radiation, are compared with the predictions of different QCD Monte Carlo programs with optimized parameter values. These Monte Carlo programs use either the second order matrix element or the parton shower evolution for the perturbative QCD calculations and use the string, the cluster, or the independent fragmentation model for hadronization. Both parton shower andO(α 2 s matrix element based models with string fragmentation describe the data well. The predictions of the model based on parton shower and cluster fragmentation are also in good agreement with the data. The model with independent fragmentation gives a poor description of the energy flow distribution. The predicted energy evolutions for the mean values of thrust, sphericity, aplanarity, and charge multiplicity are compared with the data measured at different center-of-mass energies. The parton shower based models with string or cluster fragmentation are found to describe the energy dependences well while the model based on theO(α 2 s calculation fails to reproduce the energy dependences of these mean values.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01558288
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Sugar and phosphate metabolism and alkaloid production phases in submerged cultures of two Claviceps strains (1982)
    Springer
    Applied microbiology and biotechnology 16 (1982), S. 208-211 
    Details
    ISSN: 1432-0614
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Summary In submerged cultures of Claviceps sp. CP II, elymoclavine was synthesized only by the growing mycelium (phase P1), whereas cultures of C. purpurea strain 129 produced agroclavine after vegetative growth had also ceased (phase P2). In strain CP II, the peak of activity of malate dehydrogenase, glucose-6-phosphate dehydrogenase and phosphatases was related to the time of maximum growth rate and alkaloid production. Citrate synthase activity paralleled the course of alkaloid synthesis. Strain 129 exhibited a further activity peak of the same magnitude during phase P2. ATP levels in both cultures corresponded to the pattern of change in enzyme activities. Strain CP II contained roughly twice as much orthophosphate and ATP in its cells as strain 129 and exhibited higher average activity of glucose-6-phosphate dehydrogenase. It follows from these results that alkaloid synthesis requires the processes of primary metabolism, even when it occurs after active growth of the culture has ceased. Cultures producing alkaloids oxidized at C-8 exhibit higher glucose-6-phosphate dehydrogenase activity, probably because of a higher NADPH consumption.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00505834
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  • 5
    Electronic Resource
    Electronic Resource
    Propagation of transient SH-waves in a dipping structure by finite- and boundary element methods (1989)
    Springer
    Acta mechanica 80 (1989), S. 113-125 
    Details
    ISSN: 1619-6937
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary The boundary and the finite element formulations for the equations of elasticity are presented and applied to the problem of propagation of transient SH-waves in dipping layers overlying a half-space. When the finite element formulation is used, appropriate boundary conditions are imposed on the additional boundary dividing the half-space into a finite and an infinite region. These conditions ensure the transmission of waves across this boundary. When the boundary element method is applied, it is necessary to satisfy the radiation conditions. Theoretical seismograms for the displacement on the surface of the half-space are presented. They show that, for a specific case, the agreement between the two methods is satisfactory. The results can be compared with those found by the exact method of generalized rays in order to check the validity of the finite and the boundary element methods for the specific problem studied in this paper.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01178183
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  • 6
    Electronic Resource
    Electronic Resource
    Über die kationische Copolymerisation von Trioxan und Styrol, initiiert durch BF3(C2H5)Al(C2H5)2 (1971)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 146 (1971), S. 227-235 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Melt copolymerization of trioxane and styrene initiated by a complex from Al(C2H5)3 and BF3 was investigated. The influence of the concentrations of the components is determined. It is shown that the composition of the copolymer does not depend on the concentration of the catalyst. A probable mechanism of the process is offered.
    Notes: Es wurde die Copolymerisation von Trioxan und Styrol (in Schmelze bei 65°C) unter der Einwirkung eines Komplexes aus Al(C2H5)3 und BF3 sowie die Beeinflussung der Polymerisation durch die Monomer-Konzentrationen untersucht. Es erwies sich, daß die Zusammensetzung des Copolymeren von der Konzentration des Initiator-Komplexes unabhängig ist. Der mutmaßliche Mechanismus der Copolymerisation wird diskutiert.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1971.021460123
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