Die Berechnung der laminaren Absaugegrenzschicht mit dem Differenzenverfahren

Übersicht Es wird ein Differenzenverfahren für laminare, inkompressible Absaugegrenzschichten angegeben. Für eine große Zahl von Beispielen werden die numerischen Resultate mitgeteilt.

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Summary A difference method for laminar, incompressible boundary layers with suction is developed. Numerical results for a great number of examples are presented.

     

Energy distributions of low-energy noble gas ions backscattered from a single-crystal nickel surface

The energy distribution of noble gas ions in the energy range below 1 keV from a single-crystalline surface depends on the composition and the structure of the surface, the mass and energy of the impinging ions and the geometrical conditions (e.g. angle of incidence) of the experiment. In the case of He ions the kinematic binary collision theory can be applied. For Ne ions the scattering process is more complicated, good agreement between a multiple scattering model and the experiment is achieved. Deviations from this general behaviour are observed with heavier ions (Ar⁺) and at very low energies. The experimental evidence for the different processes is discussed.     

Symmetric curves,hexagons, and the girth of spheres in dimension 3

It is proved that every centrally symmetric simple closed curve on the boundary of a centrally symmetric convex body in a three-dimensional linear space possesses an inscribed concentric affinely regular hexagon. This result is used to settle affirmatively a conjecture in [2] about the metric structure of the unit spheres of three-dimensional normed space.     

Untersuchung von Fleisch und Fisch

Ohne Zusammenfassung