Die Jacobigruppe und die Wärmeleitungsgleichung

Ohne Zusammenfassung     

Proteoglykan-Populationen der Zwischenwirbelscheibe von Rind und Mensch

Ohne Zusammenfassung

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Proteoglycan populations of bovine and human intervertebral disc

     

FehlererKennung und Programmoptimierung in der ET-AAS durch zeitaufgel?ste Signale (Direkte Elementspurenbestimmung in Harn: Cd, Co, Cr, Ni, Tl, Pb)

Summary The direct determination of trace elements in urines with ET-AA-spectrometry leads to numerous systematic errors. Part of these errors can be discovered by time-resolved signals and can thereby be avoided. Contrary to the assumption that optimal results can be obtained via the signal area, it is often the measurement of the signal height, which is to be given preference (better ratio of atomic absorption signal/background signal). Phosphate-containing matrix modifiers cause systematic interferences; their use should therefore be avoided. The determination of cobalt traces with the ET-AA-spectrometry and with D₂-background correction will always yield wrong values, if samples contain at the same time phosphorous oxygen compounds as well as alkali compounds. Previous Co-determinations which were carried out with this method, should therefore be controlled in a number of biotic matrices. When Zeeman-correction is used, such errors will not occur.     

Photon interferometry of Au+Au collisions at the BNL Relativistic Heavy-Ion Collider

We calculate the two-body correlation function of direct photons produced in central Au+Au collisions at the Relativistic Heavy-Ion Collider. Our calculation includes contributions from the early preequilibrium phase in which photons are produced via hard parton scatterings as well as radiation of photons from a thermalized quark-gluon plasma and the subsequent expanding hadron gas. We find that high energy photon interferometry provides a faithful probe of the details of the space-time evolution and of the early reaction stages of the system.     

Color view of atomic highs and lows in tunneling induced light emission

Based on a detailed experimental study of light emission stimulated with a scanning tunneling microscope, we put forward a consistent picture for the atomic-scale contrasts observed to date on noble metal surfaces. Divergent contrasts near various atomic steps and conflicting interpretations of light emission from a model atomic grating, (2 x 1) reconstructed Au(110), are accounted for. The light intensity modulation results from different spatial distributions of the local density of final states in the elastic and inelastic tunneling channels.