Röntgenkleinwinkel- und Dichtemessungen an verstrecktem und getempertem linearem Polyäthylen

Ohne Zusammenfassung Aus dem ERP-Fonds des Senats von Berlin und von der Deutschen Forschungsgemeinschaft erhielten wir finanzielle Unterstützung zur Durchführung dieser Arbeit, wofür wir herzlich danken m?chten.     

Tunable coherent radiation source covering a spectral range from 185 to 880 nm

We have studied experimentally stimulated Raman scattering and 4-wave-interaction processes occuring in hydrogen gas, which is excited by a Nd:YAG-pumped dye laser. The tuning ranges of the various Stokes and anti-Stokes lines, which are generated with high efficiency, cover the spectrum from 185 to 880 nm without a gap.     

Transitive affine planes admitting elations

Affine planes which admit a point transitive collineation group and at least one affine elation are considered. Such a plane is shown to be (A,?_∞)-transitive for some point A on ?_t8 and to be a translation plane if at least two distinct elation centers exist. If the plane has at least (order)^1/2+1 distinct elation centers and the group generated by the elations is nonsolvable then the plane is either Desarguesian or Lüneburg-Tits.     

Eine Kennzeichnung topologischer Räume durch Hüllenalgebren

Ohne Zusammenfassung     

Zur Physik des Parakristalls

Ohne Zusammenfassung