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  • 1995-1999  (3)
  • 1985-1989  (3)
  • 1940-1944  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Beam formation at the Munich atomic beam source : Proceedings of the 7th international conference on ion sources (1998)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 69 (1998), S. 750-752 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A Stern–Gerlach atomic-beam ion source (ABS) with an electron cyclotron resonance (ECR) ionizer and a Cs gas target as charge exchange units will replace the Munich Lamb–Shift polarized hydrogen source. The goal is to achieve intense negative beams of polarized H− and D− of high brightness for injection into the 14 MV MP tandem accelerator and beam intensity of about 2 μA on the target. At the entrance of the ECR ionizer the observed intensity of the neutral beam of polarized atoms is 6.4±0.4×1016 H/s, equivalent to 10 particle/mA before ionization. Comparing beam transport calculations with beam intensity measurements under various conditions allows a consistent description of the beam formation in the ABS with respect to the degree of dissociation ((similar, equals)80%), peaking ((similar, equals)1.6), beam absorption ((similar, equals)40%), and pumping speeds to be made. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1148565
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Neutron diffraction determination of the nuclear spin ordering in Cu and Ag at nano- and subnano-K temperatures (invited) : The 40th annual conference on magnetism and magnetic materials (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 5078-5080 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The spontaneous nuclear spin ordering in the simple diamagnetic metals Cu and Ag has been studied by neutron diffraction using the spin dependent part of the nuclear cross section. Simple antiferromagnetic ordering of type I has been found in zero field for these fcc-systems below 60 and 560 pK for Cu and Ag, respectively. The ordering in an applied field has been investigated and the phase diagrams have been determined: a very complex phase diagram with different magnetic structures, strong hysteresis, and time dependence was found for Cu, while in Ag the phase diagram is very simple. Comparison with ab initio calculations allows a rather deep insight into the interactions leading to the ordering. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.361579
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    An efficient labeling technique for solving sparse assignment problems (1986)
    Springer
    Computing 36 (1986), S. 301-311 
    Details
    ISSN: 1436-5057
    Keywords: 90C08 ; Assignment problem ; algorithms ; computational results
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Description / Table of Contents: Zusammenfassung Wir beschreiben eine neue Implementierung der kürzesten-erweiternden-Wege-Methode zur Lösung dünner Zuordnungsprobleme und berichten über numerische Untersuchungen, die die Effizienz dieser Implementierung dokumentieren.
    Notes: Abstract We describe a new implementation of the shortest augmenting path approach for solving sparse assignment problems and report computational experience documenting its efficiency.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02240205
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    On the use of optimal fractional matchings for solving the (integer) matching problem (1986)
    Springer
    Computing 36 (1986), S. 263-270 
    Details
    ISSN: 1436-5057
    Keywords: 90C10 ; Matching problem ; assignment problem ; computational results
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Description / Table of Contents: Zusammenfassung Wir zeigen wie optimale „Fractional Matchings”, d. h. optimale Lösungen der LP-Relaxation des Matching-Problems, benutzt werden können, um Ausgangslösungen für die kürzeste erweiternde Wege-Methode zur Lösung des Matching-Problems zu konstruieren. Numerische Untersuchungen zeigen, daß diese Startprozedur höchst effizient ist und den Aufwand für den eigentlichen Matching-Algorithmus signifikant reduziert, so daß die Gesamtrechenzeit drastisch reduziert wird.
    Notes: Abstract We show how optimal fractional matchings can be used to start the shortest augmenting path method for solving the (integer) matching problem. Computational results are presented which indicate that this start procedure is highly efficient, i.e. it is fast and reduces the amount of work for the shortest augementing path method significantly such that the overall computing time is reduced drastically.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02240072
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Soft and hard Pomeron in the structure function of the proton at low x and low $Q^2$ (1999)
    Springer
    The European physical journal 9 (1999), S. 601-609 
    Details
    ISSN: 1434-6052
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract. We study inclusive electroproduction on the proton at low x and low $Q^2$ using a soft and a hard Pomeron. The contribution of the soft Pomeron is based on the Stochastic Vacuum Model, in which a nonperturbative dipole-dipole cross section can be calculated by means of a gauge invariant gluon field strength correlator. To model the hard Pomeron exchange we phenomenologically extend the leading order evolution of a power-behaved structure function, $F_2 \propto x^{- \lambda}$ , proposed by López and Ynduráin. This extension allows to consider both the case $Q^2 = 0$ and the region of higher $Q^2$ on the basis of the same parametrization. A good simultaneous fit to the data on $F_2$ and on the cross section $\sigma_{\gamma p}$ of real photoproduction is obtained for $\lambda=0.37$ . With four parameters we achieve a $\chi^2/\textrm{d.o.f.} = 0.98$ for 222 data points. In addition, we use our model of the inclusive $\gamma^{\ast} p$ interaction to compute the longitudinal structure function $F_L$ .
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100530050508
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    An in-core/out-of-core method for solving large scale assignment problems (1986)
    Springer
    Mathematical methods of operations research 30 (1986), S. A181 
    Details
    ISSN: 1432-5217
    Keywords: assignment problem ; augmenting path method ; outpricing ; re-optimization phase
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Economics
    Description / Table of Contents: Zusammenfassung Wir beschreiben einen sogenannten “In-Core/Out-of-Core” Ansatz auf der Basis der kürzesten erweiternden Wege Methode für die Lösung gro\er Zuordnungsprobleme, für die die gesamte Kostenmatrix nicht im Zentralspeicher des Rechners gehalten werden kann. Bei diesem Ansatz wird in einer ersten Phase ein Zuordnungsproblem über einem dünnen Teilgraph optimal gelöst. In einer zweiten Phase werden dann die nicht berücksichtigen Kanten mittels der optimalen Duallösung bewertet (“outpricing”) und gegebenenfalls eine Reoptimierung durchgeführt. Durch Anwendung spezieller Strategien wird es möglich, während der gesamten Lösung den im Zentralspeicher abzuspeichernden Teilgraphen dünn zu halten. Weiterhin zeigt sich, da\ dieser Ansatz zu einem neuen Verfahren führt, das der zugrunde liegenden kürzesten erweiternden Wege Methode überlegen ist.
    Notes: Abstract We describe how the shortest augmenting path method can be used as basis for a so called “in-core/out-of-core” approach for solving large assignment problems in which the data cannot be kept in central memory of a computer. Here we start by solving the assignment problem on a sparse subgraph and then we introduce the remaining edges in an outpricing/reoptimization phase. We introduce several strategies which enable to keep the working subgraph sparse throughout the procedure and even lead to an all in-core code which is faster than the basic shortest augmenting path code.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01919285
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    Glas, Keramik (1943)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 125 (1943), S. 155-156 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01358665
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    Paper (German National Licenses)
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