Nuclear Clusters as a Probe for Expansion Flow in Heavy Ion Reactions at 10-15AGeV

A phase space coalescence description based on the Wigner-function method for cluster formation in relativistic nucleus-nucleus collisions is presented. The momentum distributions of nuclear clusters d,t and He are predicted for central Au(11.6AGeV)Au and Si(14.6AGeV)Si reactions in the framework of the RQMD transport approach. Transverse expansion leads to a strong shoulder-arm shape and different inverse slope parameters in the transverse spectra of nuclear clusters deviating markedly from thermal distributions. A clear ``bounce-off'' event shape is seen: the averaged transverse flow velocities in the reaction plane are for clusters larger than for protons. The cluster yields --particularly at low $p_t$ at midrapidities-- and the in-plane (anti)flow of clusters and pions change if suitably strong baryon potential interactions are included. This allows to study the transient pressure at high density via the event shape analysis of nucleons, nucleon clusters and other hadrons.Comment: 38 pages, 9 figures, LaTeX type, eps used, subm. to Phys. Rev.

Hornmilben (Acari, Oribatida) aus dem Europa-Schutzgebiet Zurndorfer Eichenwald (Burgenland, Österreich)

Schatz, H., Hofstätter, S. (2014): Hornmilben (Acari, Oribatida) aus dem Europa-Schutzgebiet Zurndorfer Eichenwald (Burgenland, Österreich). Linzer biologische Beiträge 46 (2): 1775-1793, DOI: 10.5281/zenodo.531233

Abb. 3 in Hornmilben (Acari, Oribatida) aus dem Europa-Schutzgebiet Zurndorfer Eichenwald (Burgenland, Österreich)

Abb. 3: Hornmilben (Acari, Oribatida) vom Zurndorfer Eichenwald, Gemeinsame Arten mit umliegenden Gebieten (Quellen vgl. Text).Published as part of <i>Schatz, H. & Hofstätter, S., 2014, Hornmilben (Acari, Oribatida) aus dem Europa-Schutzgebiet Zurndorfer Eichenwald (Burgenland, Österreich), pp. 1775-1793 in Linzer biologische Beiträge 46 (2)</i> on page 1780, DOI: <a href="http://zenodo.org/record/5312338">10.5281/zenodo.5312338</a&gt

Time adaptive Zassenhaus splittings for the Schrödinger equation in the semiclassical regime

Time dependent Schrödinger equations with conservative force field commonly constitute a major challenge in the numerical approximation, especially when they are analysed in the semiclassical regime. Extremely high oscillations originate from the semiclassical parameter, and call for appropriate methods. We propose to employ a combination of asymptotic Zassenhaus splitting with time adaptivity. While the former turns the disadvantage of the semiclassical parameter into an advantage, leading to highly efficient methods with low error constants, the latter enables to choose an optimal time step and to speed up the calculations when the oscillations subside. We support the results with numerical examples