Refine
Year of publication
Document Type
- Article (68)
- Preprint (7)
- Part of a Book (5)
- Conference Proceeding (1)
Has Fulltext
- yes (81)
Is part of the Bibliography
- no (81)
Keywords
- Anna Amalia <Sachsen-Weimar-Eisenach (3)
- Geschichte (3)
- Herzogin> (3)
- Hof (3)
- Kunst (3)
- Literatur (3)
- Kongress (2)
- Rezeption (2)
- Weimar / Herzogin-Anna-Amalia-Bibliothek (2)
- ALICE experiment (1)
Institute
- Physik (71)
- Frankfurt Institute for Advanced Studies (FIAS) (11)
- Informatik (9)
- Medizin (2)
In diesem Beitrag sollen die Differenzen zwischen der Praxis und den zeitgenössischen Idealen von Geselligkeit, Mäzenatentum und Kunstliebhaberei an Anna Amalias Hof zwischen 1775 und 1807 aufgezeigt werden. Als Voraussetzung dafür wäre es wünschenswert, alle Behauptungen der ,Musenhof‘-Legende, wie sie in den Biographien und sonstigen Publikationen über Anna Amalia und ihrem Hof kursieren, ausführlich und systematisch zu widerlegen. Dies ist im Rahmen dieses Aufsatzes nicht möglich. In den ersten Abschnitten werden daher drei Elemente der historiographischen Überhöhung, die bereits für die zeitgenössische Stilisierung des Hofs zentral waren, thesenhaft bzw. anhand von einschlägigen Gegenbeispielen zurechtgerückt. Es soll gezeigt werden, daß sich (I.) Geselligkeit und Kunstliebhaberei am ,Musen-hof‘ Anna Amalias in wesentlichen Phasen nicht im politikfreien Raum bewegten, und daß (II.) die Intentionen und Wirkungen ihres Mäzenatentums sowie damit verbundene Geselligkeitskonzepte in der Forschung überschätzt wurden. Anschließend wird (III.) genauer darauf eingegangen, wie sich die Freiräume der Herzogin als kunstliebhabender Gesellschafterin in den Jahren 1790 bis 1807 verengten. Diese verengten Freiräume werden (IV.) mit den Sinnkonstruktionen kontrastiert, die Anna Amalia und ihre Zeitgenossen ihrer Tätigkeit als Gesellschafterin, Kunstliebhaberin und Mäzenin verliehen, d.h. als Fürstin, die die Rahmenbedingungen der Geselligkeit und der künstlerischen Betätigung an ihrem Hof mitgestaltete. Mit diesen Sinnkonstruktionen wurde die Praxis von Geselligkeit, Kunstliebhaberei und Kunstförderung am Hof Anna Amalias überhöht. Dabei klafften Idealisierung und Realität phasenweise beträchtlich auseinander. Die ,Musensitz‘-Vision wurde zur ,Ideologie‘, womit hier vulgärmarxistisch ein "falsches Bewußtsein" der Realität bezeichnet wird. Am Ende ihres Lebens wurde der Herzogin diese Diskrepanz selbst bewußt. Abschließend soll (V.) gefragt werden, inwieweit die spätere historiographische ,Musenhof‘-Legende an die zeitgenössischen Stilisierungen des ,Musensitzes‘ anknüpfte, die von der Herzogin und ihrem engeren Hofstaat selbst ausgingen.
We report first results on elliptic flow of identified particles at midrapidity in Au+Au collisions at sqrt[sNN] = 130 GeV using the STAR TPC at RHIC. The elliptic flow as a function of transverse momentum and centrality differs significantly for particles of different masses. This dependence can be accounted for in hydrodynamic models, indicating that the system created shows a behavior consistent with collective hydrodynamical flow. The fit to the data with a simple model gives information on the temperature and flow velocities at freeze-out.
The minimum-bias multiplicity distribution and the transverse momentum and pseudorapidity distributions for central collisions have been measured for negative hadrons ( h-) in Au+Au interactions at sqrt[sNN] = 130 GeV. The multiplicity density at midrapidity for the 5% most central interactions is dNh-/d eta | eta = 0 = 280±1(stat)±20(syst), an increase per participant of 38% relative to pp-bar collisions at the same energy. The mean transverse momentum is 0.508±0.012 GeV/c and is larger than in central Pb+Pb collisions at lower energies. The scaling of the h- yield per participant is a strong function of pperp. The pseudorapidity distribution is almost constant within | eta |<1.
We report the first measurement of inclusive antiproton production at midrapidity in Au+Au collisions at sqrt[sNN] = 130 GeV by the STAR experiment at RHIC. The antiproton transverse mass distributions in the measured transverse momentum range of 0.25<pperp<0.95 GeV/c are found to fall less steeply for more central collisions. The extrapolated antiproton rapidity density is found to scale approximately with the negative hadron multiplicity density.
We report results on the ratio of midrapidity antiproton-to-proton yields in Au+Au collisions at sqrt[sNN] = 130 GeV per nucleon pair as measured by the STAR experiment at RHIC. Within the rapidity and transverse momentum range of | y|<0.5 and 0.4<pt<1.0 GeV/c, the ratio is essentially independent of either transverse momentum or rapidity, with an average of 0.65±0.01(stat)±0.07(syst) for minimum bias collisions. Within errors, no strong centrality dependence is observed. The results indicate that at this RHIC energy, although the p-p-bar pair production becomes important at midrapidity, a significant excess of baryons over antibaryons is still present.
Alterations in dendritic spine numbers are linked to deficits in learning and memory. While we previously revealed that postsynaptic plasticity-related gene 1 (PRG-1) controls lysophosphatidic acid (LPA) signaling at glutamatergic synapses via presynaptic LPA receptors, we now show that PRG-1 also affects spine density and synaptic plasticity in a cell-autonomous fashion via protein phosphatase 2A (PP2A)/β1-integrin activation. PRG-1 deficiency reduces spine numbers and β1-integrin activation, alters long-term potentiation (LTP), and impairs spatial memory. The intracellular PRG-1 C terminus interacts in an LPA-dependent fashion with PP2A, thus modulating its phosphatase activity at the postsynaptic density. This results in recruitment of adhesome components src, paxillin, and talin to lipid rafts and ultimately in activation of β1-integrins. Consistent with these findings, activation of PP2A with FTY720 rescues defects in spine density and LTP of PRG-1-deficient animals. These results disclose a mechanism by which bioactive lipid signaling via PRG-1 could affect synaptic plasticity and memory formation.
Partial wave analysis of the reaction p(3.5 GeV) + p → pK +Λ to search for the "ppK−" bound state
(2015)
Employing the Bonn–Gatchina partial wave analysis framework (PWA), we have analyzed HADES data of the reaction p(3.5 GeV) + p → pK +Λ. This reaction might contain information about the kaonic cluster “ppK −” (with quantum numbers J P = 0− and total isospin I = 1/2) via its decay into pΛ. Due to interference effects in our coherent description of the data, a hypothetical KNN (or, specifically “ppK −”) cluster signal need not necessarily show up as a pronounced feature (e.g. a peak) in an invariant mass spectrum like pΛ. Our PWA analysis includes a variety of resonant and non-resonant intermediate states and delivers a good description of our data (various angular distributions and two-hadron invariant mass spectra) without a contribution of a KNN cluster. At a confidence level of CLs = 95% such a cluster cannot contribute more than 2–12% to the total cross section with a pK +Λ final state, which translates into a production cross-section between 0.7 μb and 4.2 μb, respectively. The range of the upper limit depends on the assumed cluster mass, width and production process.
Many QCD based and phenomenological models predict changes of hadron properties in a strongly interacting environment. The results of these models differ significantly and the experimental determination of hadron properties in nuclear matter is essential. In this paper we present a review of selected physics results obtained at GSI Helmholtzzentrum für Schwerionenforschung GmbH by HADES (High-Acceptance Di-Electron Spectrometer). The e+e− pair emission measured for proton and heavy-ion induced collisions is reported together with results on strangeness production. The future HADES activities at the planned FAIR facility are also discussed.
The knowledge of baryonic resonance properties and production cross sections plays an important role for the extraction and understanding of medium modifications of mesons in hot and/or dense nuclear matter. We present and discuss systematics on dielectron and strangeness production obtained with HADES on p+p, p+A and A+A collisions in the few GeV energy regime with respect to these resonances.