High Performance Computing in Science and Engineering ’98: by Prof. Dr. Hanns Ruder (auth.), Egon Krause, Willi Jäger

By Prof. Dr. Hanns Ruder (auth.), Egon Krause, Willi Jäger (eds.)

The e-book includes stories concerning the most vital tasks from technological know-how and which are utilizing the supercomputers of the Federal excessive functionality Computing heart Stuttgart (HLRS). those tasks are from diverse clinical disciplines, with a spotlight on engineering, physics and chemistry. They have been rigorously chosen in a peer-review method and are showcases for an leading edge mix of state of the art actual modeling, novel algorithms and using modern parallel desktop expertise. As HLRS is in shut cooperation with commercial businesses, distinct emphasis has been wear the economic relevance of effects and methods.

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Eschner, W . Neuhauser , and P. E . Toschek, IQEC'96 Technical Digest (Optical Society of America, Washington DC 1996) . 15. M. Arndt, A. Buchleitner, R . N. Mantegna and H. Walther, Phys. Rev . Lett . 67, 2435 (1991); F . L. Moore, J . Robinson, C. Bharucha, B. Sundaram and M. G. Raizen, Phys. Rev. Lett. 75 , 4598 (1995) ; R. Blumel, A. Buchleitner, R. Graham, L. Sirko, U. Smilansky, and H. Walther, Phys. Rev. A 44, 4521 (1991) . 16. P. Goetsch and R . Graham, Phys. Rev. A 54, 5345 (1996). 17.

15]. calculated as L rq(t) Q F(t) = rv r6. (1) q:::l and behaved very regularly. Figure 4 shows the results for Q 7. They confirm that the exponent () is universal (independent of temperature) not only in the Ising model[12) but also in the Potts model. 4 Computational Details The above simulations have been very time-consuming, and could only be completed by using large amounts of computing resources of the IBM RS/6000 SP at the University of Karlsruhe. Since the author is permanently working in the team which operates the SP, they have at the same time provided an extensive test bed for identifying and resolving various operational problems with the machine and so have been very useful in improving the overall availability and stability of the system after its upgrade to 256 nodes.

Dynamical localization in the Paul trap - the infl uence of the internal structure of the atom Karl Riedel, Paivi Torma, Vladimir Savichev, and Wolfgang P. Schleich Abteilung fur Quantenphysik, Universitat Ulm, 89069 Ulm, Germany Abstract. We show that quantum localization occurs in the center-of-mass motion of a two-level ion stored in a Paul trap and interacting with a standing laser field . The variable showing localization is identified to be the vibrational quantum number of a reference Floquet oscillator.

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