Ueber eisen- und thonerdehaltige Superphosphate und deren analytische Untersuchung

Ohne Zusammenfassung     

Katalyse und Induktion bei Redox-Reaktionen

Zusammenfassung Es wird gezeigt, daß die Erscheinung der Polarisation bei elektroanalytischen Fällungen, sei es durch äußere oder durch innere Stromzufuhr, als eine Selbstinduktion angesehen werden kann. Sie ist auf Verzögerungen, Hemmungen oder innere Widerstände der primären gegenseitigen Induktion zurückzuführen.     

Gas-phase fragmentation of the Ag+—phenylalanine complex: Cation—π interactions and radical cation formation

Collision-induced dissociation experiments on the Ag+-phenylalanine complex using several collision energies were shown to yield ten different fragment ions. Unambiguous assignment of these fragment ions were made by careful analysis of deuterium labeling experiments. The losses of H2O, CO, CO2, and AgH were commonly observed; also encountered were the losses of H2, Ag, and H. Deuterium labeling experiments and density functional calculations have been employed to probe fragmentation mechanisms that account for all experimental results.     

Die Bestimmung von Methoxylgruppen in einigen Lignozellulosen

Ohne Zusammenfassung     

Algebraische Funktionen von fastperiodischen Funktionen

Ohne Zusammenfassung     

Anschauliches zur Riemannschen Zetafunktion

Ohne Zusammenfassung     

Comparison between radiative transfer theory and the simplified spherical harmonics approximation for a semi-infinite geometry

In this study, the third-order simplified spherical harmonics equations (SP3), an approximation of the radiative transfer equation, are solved for a semi-infinite geometry considering the exact simplified spherical harmonics boundary conditions. The obtained Green's function is compared to radiative transfer calculations and the diffusion theory. In general, it is shown that the SP3 equations provide better results than the diffusion approximation in media with high absorption coefficient values but no improvement is found for small distances to the source.     

Anisotropic light diffusion: an oxymoron?

Light propagation in anisotropic random media is studied in the steady-state and time domains. Solutions of the anisotropic diffusion equation are compared to results obtained by the Monte Carlo method. Contrary to what has been reported so far, we find that even in the "diffusive regime" the anisotropic diffusion equation does not describe correctly the light propagation in anisotropic random media.     

Flow separation in laminar natural convection

Theoretical and experimental studies of flow separation in laminal natural convection are presented. Since classical boundary-layer theory cannot determine separation on curved walls in natural convection, two extensions of the classical boundary-layer theory are discussed: boundary-layer theory of higher order and double-deck theory. Both theories are applied to experiments on a vertical flat plate with humps.     

Scattering of light by multiple dielectric cylinders: comparison of radiative transfer and Maxwell theory

We have compared radiative transfer theory with analytical solutions of the Maxwell equations for light scattering by multiple infinitely long parallel cylinders at perpendicular incidence. The calculated scattering cross sections for both methods show large differences, but the angle-dependent differential scattering cross-section results are very similar for small cylinder densities, except close to the forward direction. In contrast to recently published results, it is shown that the radiative transfer equation is a useful approximation for small cylinder concentrations.