Verhalten des Schwefels zu Ammoniak

Analytical and Bioanalytical Chemistry -     

Analyse der Luft

Ohne Zusammenfassung     

Equilibrium programming using proximal-like algorithms

We compute constrained equilibria satisfying an optimality condition. Important examples include convex programming, saddle problems, noncooperative games, and variational inequalities. Under a monotonicity hypothesis we show that equilibrium solutions can be found via iterative convex minimization. In the main algorithm each stage of computation requires two proximal steps, possibly using Bregman functions. One step serves to predict the next point; the other helps to correct the new prediction. To enhance practical applicability we tolerate numerical errors. Research supported partly by the Norwegian Research Council, project: Quantec 111039/401.     

A study of gluon scattering and gluon fragmentation in highp T interactions at the ISR

Gluon scattering processes are studied in hadronic highp _T events using data obtained with the Split Field Magnet detector (SFM) at the CERN ISR. The experimental set-up allowed the scanning of a wide range of parton energies and scattering angles. It is shown that for positive pions as trigger particles, the parton composition of the recoil jet is correlated with the polar angle and transverse momentum of the triggering pion. Over the kinematical region studied, the recoil jet originates predominantly from scatered gluons, with an increasing prevalence of the gluon component towards forward triggering angles. The variation of the momentum structure of the recoil jet with the trigger angle indicates that the fragmentation function of gluons is softer than that of quarks.     

Δπ decay of baryons in a flux-tube-breaking mechanism

Based on the flux-tube-breaking mechanism, we have previously studied the strong decay of nonstrange baryons into the elastic and several inelastic channels. Here, we extend these studies toΔ π decay. We compare our results with those of Koniuk and Isgur and with recently improved experimental data. We also present results of a new and improved calculation ofN π decay and discuss the problem of resonance identification.     

Beiträge zur Chemie der Pyrrolpigmente, 65. Mitt.

The title compound1 is found to be protonated corresponding topK _a 's of 2.5 and 0.5, thereby being two orders of magnitude less basic than bilatrienes-abc. Its deprotonation (pK _a =17.1) is found to be less easy than in case of the bilatrienes.1 is shown to exhibit a very pronounced reactivity for nucleophiles at the methine positions 10 and 15—a thiole adduct and the 10,15-dihydroderivative of1 are isolated and characterised. In contrast to the bilatrienes the adduct formation is irreversible. Accordingly, no diastereomers at exocyclic double bonds could be produced photochemically. Complexation of the lactam oxygens is achieved in case ofLewis acids (eg. AlCl₃), chelation after addition of a proton acceptor is observed in a few cases only (Zn⁺⁺, Hg⁺⁺, In⁺⁺⁺).

Herrn Prof. Dr.K. Kratzl zum 70. Geburtstag gewidmet.