Dynamics of K+K^+ Production in Heavy Ion Collisions close to Threshold

In this article the production of $K^+$ at energies close to the threshold is studied in detail. The production mechanisms, the influence of in-medium effects, cross sections, the nuclear equation of state and the dynamics of the nucleons on the kaon dynamics are discussed. A special regard will be taken on the collision of Au+Au at 1.5 GeV, a reaction that has recently been analyzed in detail by experiments performed by the KaoS and FOPI collaborations at the SIS accelerator at GSI.Comment: extract from habilitation at Nantes university (France), 76 pages, 76 figures, ps-file about 6M

Landau-Vlasov model versus Vlasov-Uehling-Uhlenbeck-approach : different flow effects from the same theory?

Differences between the Nantes-Ganil-Grenoble (NGG) LV-model and the original VUU approach are analysed. It is found that the LV code tends to simulate - for small timesteps - a non-viscous testparticle fluid

Spectral ratio: an observable to determine K+K^{+} nucleus potential and K+K^{+} N scattering cross section

Here we aim to show that the ratio of the momentum spectra of $K^{+}$ at small transverse momentum measured for symmetric systems of different sizes can be such an observable.Comment: 3 pages, 2 figs, DAE BRNS Symposium on Nuclear Physics Dec 26-30, (2011), Visakhapatnam A.P. INDI

In-medium effects on K+K^{+} and K−K^{-} spectra in lighter systems

We aim to explore the in-medium effects on the transverse momentum ($p_{T}$) spectra of $K^{+}$ and $K^{-}$ in lighter mass system $^{12}C+^{12}C$.Comment: 3 pages, 1 fig. DAE BRNS Symposium on Nuclear Physics Dec 26-30, (2011), Visakhapatnam A.P. INDI

Analysis of Dilepton Invariant Mass Spectrum in C+C at 2 and 1 AGeV

Recently the HADES collaboration has published the invariant mass spectrum of $e^+e^-$ pairs, dN/dM$_{e^+e^-}$, produced in C+C collisions at 2 AGeV. Using electromagnetic probes, one hopes to get in this experiment information on hadron properties at high density and temperature. Simulations show that firm conclusions on possible in-medium modifications of meson properties will only be possible when the elementary meson production cross sections, especially in the pn channel, as well as production cross sections of baryonic resonances are better known. Presently one can conclude that a) simulations overpredict by far the cross section at $M_{e^+e^-} \approx M_{\omega}{^0}$ if free production cross sections are used and that b) the upper limit of the $\eta$ decay into $e^+e^-$ is smaller than the present upper limit of the Particle Data Group. This is the result of simulations using the Isospin Quantum Molecular Dynamics (IQMD) approach.Comment: 28 pages, 15 figures, 3 tables, ps file recommende

Felt-bodily didactics. Educational processes from a subjective-bodily phenomenological perspective

Der Beitrag geht davon aus, dass Bildungsprozesse als Auseinandersetzung des Subjektes mit sich selbst und der Welt stets leiblich vermittelte Prozesse sind. Für die Didaktik bedeutet dies, dass Lehrmethoden und Lerninhalte stets in Kontexte eingebunden werden müssen, welche die Schülerinnen und Schüler leiblich-affektiv ergreifen. Aufbauend auf den leibphänomenologischen Überlegungen von Hermann Schmitz (2008), wird das leibliche Lernen in personaler Regression und Emanzipation betrachtet und es werden Überlegungen zur Haltung der Lehrkraft angestellt, welche die Schülerinnen und Schüler begleiten und Lerninhalte wie Räume atmosphärisch einbetten sollte. Schließlich werden einige gängige Praxisbeispiele gegeben, welche die Ideen einer leiblichen Didaktik´ für den Schulalltag verdeutlichen sollen. (DIPF/Orig.)The article assumes that educational processes – as an examination between the subject, itself, and the world – always are subjective-bodily mediated processes. Regarding didactics, this means that teaching methods and learning contents always need to be integrated into contexts which the students take subjective-bodily affectively. Based on Hermann Schmitz\u27s subjective-bodily phenomenological reflections (2008), physical learning is considered in personal regression and emancipation, and considerations are being made on the attitude of the teacher which should accompany the students and embed learning contents and spaces atmospherically. In the end, some common practice examples are given to illustrate the ideas of subjective-bodily didactics for the everyday school life. (Author

Transition from binary processes to multifragmentation in quantum molecular dynamics for intermediate-energy heavy ion collisions

We study the transition from fusion-fission phenomena at about 20 MeV/nucleon multifragmentation at 100–200 MeV/nucleon in the reaction 16O+80Br employing the quantum molecular dynamics model. The time evolution of the density and mass distribution, the charged-particle multiplicity, and spectra as well as angular distributions of light particles are investigated. The results exhibit the transition of the disassembly mechanism, but no sharp change is found. The results are in good agreement with recently measured 4-Pi data

Transverse flow of nuclear matter in collisions of heavy nuclei at intermediate energies

The Quantum Molecular Dynamics Model (IQMD) is used to investigate the origin of the collective transverse velocity observed in heavy ion experiments. We find that there are three contributions to this effect: initial-final state correlations, potential interactions and collisions. For a given nuclear equation of state (eos) the increase of the transverse velocity with increasing beam energy is caused by the potential part. For a given beam energy the collective transverse velocity is independent of the nuclear eos but the relative contributions of potential and collisions differ. In view of the importance of the potential interactions between the nucleons it is not evident that the similarity of the radial velocities measured for fragments at beam energies below 1 AGeV and that for mesons at beam energies above 2 AGeV is more than accidental.Comment: 5 pages, 5 figures, revtex, OASIS ref PLB1700

Delirium Predicts Three-Month Mortality in Critically Ill Patients: A New Model

Delirium is a neurocognitive disorder defined as an acute disturbance in attention, awareness, and cognition with a fluctuating course not better explained by a preexisting condition (American Psychiatric Association, 2013). It is prevalent in up to 70% of hospital patients and 82% of patients in the intensive care unit (ICU; Ely, Speroff, Gordon, & Bernard, 2004; Kavanagh & Gottfried, 2007; Mcnicoll, Pisani, Ely, Gifford, & Inouye, 2005). The impact of delirium on mortality is inconsistent in the literature. Many studies have concluded that delirium prevalence is associated with increased risk of mortality (Cole, 2004; Kavanagh & Gottfried, 2007; Moskowitz et al., 2017; Pandharipande et al., 2013; Pauley et al., 2015), while others suggest delirium does not increase risk of patients dying (Levkoff et al., 1992; Wolters et al., 2014). The objective of this retrospective observational study was to determine if delirium is an independent predictor of mortality and develop a new model predicting three-month mortality of critically ill patients. Of the 165 patients followed in this study, 42 (25.5%) were deceased at three months and 123 (74.5%) survived. The most accurate model of predicting three-month mortality had an area under the curve of 0.89 (CI: 0.81 to 0.94), which included delirium burden defined as the fraction of the number of days patients were positive for individual features of delirium during their hospital stay. The main finding of the present study is the development of a new model that accurately predicts three-month mortality of critically ill patients. This study provides further evidence that delirium is an independent predictor of mortality and new evidence that delirium fraction improves the accuracy of a predictive models of mortality. We also identified individual features of delirium that are more predictive of mortality than others. Future research is needed to develop prevention measures and treatment interventions for delirium in the ICU and on hospital floors to reduce risk of patient mortality