Parabolische Flächen im vierdimensionalen projektiven Raum

Ohne ZusammenfassungMartin Barner zum 60. Geburtstag gewidmet     

Steroids and Sex Hormons. Part 263. [1]. On the Mechanism of the Reaction of 17-Hydroxyimino-steroids with Carbodiimide/Dimethylsulfoxide

Treatment of the (Z)-isomers 6 and 7 of the four isomeric 16-acetoxy-17-hydroxyimino-steroids 6–9 with DCC/DMSO/CF₃COOH (Moffat fragmentation of oximes) yielded the seco-α-acetoxy-nitriles 10 and 11 , respectively, while similar treatment of both (E)-isomers 8 and 9 gave the formyl-carbonitrile 14. The mechanism of these fragmentations is discussed. ¹³C-NMR. data of oximes are presented which show the γ-gauche effect being associated with σ (C? H)-bond polarization.     

Coupled channel analysis of inner-shell vacancy formation in superheavy quasimolecules

We calculate the ionization probability of the quasimolecular 1sσ-state in collisions of very heavy ions with (Z ₁+Z ₂) α?1. Multistep excitation processes between bound and continuum states are investigated. Due to the multistep processes the number of created 1sσ-vacancies is typically increased by a factor 2–5 over that obtained within time-dependent perturbation theory (i.e. the one-step processes). Some implications of the many-electron problem and the Pauli principle are discussed. The δ-electron distribution is compared with recent experimental data.     

Reaction of selenite with biochemically active thiols: An X-ray photoelectron spectroscopic study

The usefulness of X-ray photoelectron spectroscopy for electron transport studies was shown by examining the reaction of selenite with mercapto-ethanol     

Differential cross sections for the charge exchange process π+p → π0 (π+p) at 8, 16 and 23 GeV/c

The differential cross section $\text{d}\text{σ}\text{d}\text{t′}$ for the charge-exchange process π⁺p → π⁰ (π⁺p) at 8, 16 and 23 GeV/c is presented for several regions of the π⁺p effective mass. It is found that the dip at t′ ≈ 0.6 (GeV/c)² which is observed in the Δ(1236) mass band becomes a less pronounced structure in the higher mass regions. However, while the slope of the $\text{d}\text{σ}\text{d}\text{t′}$ distributions in the near-forward direction decreases strongly with increasing π⁺p mass, there is no evidence that the observed structure moves to higher values of t′ as the π⁺p mass increases. These results are consistent with a Regge-exchange picture where the position of the dip is determined by the exchanged trajectory, but are inconsistent with a simple geometrical picture.