Polarizationeffects in electron-electron and positron-electron scattering

The polarization-asymmetries in the cross-sections for electron-electron and positron-electron scattering are investigated numerically in first order perturbation theory in the range from 1 keV to 10 GeV for all angles with regard to polarization-measurements.     

Stable bundle extensions on elliptic Calabi–Yau threefolds

We construct stable bundle extensions on elliptically fibered Calabi–Yau threefolds. We show that these bundles can solve the topological anomaly constraint in heterotic string theory without the need for invoking background five-branes.     

High‐pressure effects on the Diels–Alder reaction in room temperature ionic liquids

The effect of pressure on the Diels–Alder reaction was examined in room temperature ionic liquids, followed by high‐pressure FT‐IR spectroscopy using pressures up to 150 MPa. Pressure enhances the kinetic sensitivity of the reaction. The kinetic effect of fluorophobic interactions was examined using ionic liquids with fluorous cations. Ionic liquids in combination with ZnI₂ as a Lewis acid catalyst were also studied under high pressure. Copyright © 2007 John Wiley & Sons, Ltd.     

Die Sulfide des Galliums

Zusammenfassung 1. Es wurde erstmalig das Gallium-3-sulfid hergestellt und seine Eigenschaften beschrieben. 2. Durch Reduktion desselben wurde das Gallium-2-sulfid erhalten. 3. Im Hochvakuum zerlegt sich das Zweisulfid in das grauschwarze Gallium-1-sulfid und gelbe Trisulfid. 4. Durch R?ntgenogramme wurde die Existenz des ein-, zwei- und dreiwertigen Sulfides nachgewiesen.     

Der toxikologische Nachweis von L?sungsmitteln und Gasen

Ohne Zusammenfassung

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Toxicological detection of solvents and gases