Results 91 to 100 of about 2,720 (178)

Ist Phenylnitren ein fehlendes Bindeglied in der Bildung polyzyklischer aromatischer Stickstoffheterozyklen?

Angewandte Chemie, Volume 137, Issue 31, July 28, 2025.
Ein neuer Bildungsweg für polyzyklische aromatische Stickstoffheterozyklen (PANH) wurde gefunden. Die Reaktion von Phenylnitren mit dem Propargylradikal führt zu Chinolin und belegt, dass Nitrene geeignete Vorläufer zum Einbau von Stickstoffheteroatomen sind.
Rahel Arns, Rory McClish, Patrick Hemberger, Andras Bodi, Jordy Bouwman, Tina Kasper, Domenik Schleier   +6 more
wiley   +1 more source

On the protection of extrasolar Earth-like planets around K/M stars against galactic cosmic rays [PDF]

, 2009
Previous studies have shown that extrasolar Earth-like planets in close-in habitable zones around M-stars are weakly protected against galactic cosmic rays (GCRs), leading to a strongly increased particle flux to the top of the planetary atmosphere.
J. Grießmeier, A. Stadelmann, J. Grenfell, H. Lammer, U. Lesia, O. Paris, Meudon, France., N. F. F. R. Astronomy, Dwingeloo, The Netherlands., Technische Universitat Braunschweig, Germany., Institut fur Planetenforschung, Dlr, Berlin, Zentrum fur Astronomie und Astrophysik, Technische Universitat Berlin, S. R. Institute, Austrian Academy of Sciences, Graz, M Austria   +21 more
semanticscholar   +1 more source

An astronomical search for evidence of new physics: Limits on gravity-induced birefringence from the magnetic white dwarf RE J0317-853 [PDF]

, 2004
The coupling of the electromagnetic field directly with gravitational gauge fields leads to new physical effects that can be tested using astronomical data. Here we consider a particular case for closer scrutiny, a specific nonminimal coupling of torsion
O. Preuss, M. Haugan, S. Solanki, S. J. M. F. Aeronomie, Katlenburg-Lindau, G. D. O. Physics, Purdue University, Indiana., Usa Universitaet Tuebingen, I. F. A. U. Astrophysik, G. A. Rechen-Institut, Heidelberg, Germany.   +12 more
semanticscholar   +1 more source

Monte Carlo radiation hydrodynamics: methods, tests and application to supernova Type Ia ejecta [PDF]

, 2012
In astrophysical systems, radiation-matter interactions are important in transferring energy and momentum between the radiation field and the surrounding material.
U. M. Noebauer, S. Sim, M. Kromer, F. Roepke, W. H. M. F. Astrophysik, R. S. O. Astronomy, Astrophysics, Mount Stromlo Observatory, I. F. Astrophysik, U. Wurzburg   +9 more
semanticscholar   +1 more source

Warme dichte Materie in Natur und Labor: Ein ungewöhnlicher Materiezustand

Physik in unserer Zeit, Volume 56, Issue 4, Page 198-204, July 2025.
Warme dichte Materie rückt immer mehr in den Fokus, nicht nur in der Physik und Astronomie, sondern auch in den Ingenieurswissenschaften und sogar der Politik. Es handelt sich um interessante, aber auch komplizierte Zustände von Materie, die unser Verständnis ihrer Funktionsweise herausfordern.
Jan Vorberger, Tilo Döppner, Tobias Dornheim   +2 more
wiley   +1 more source

Do weak magnetic fields prevent hydrogen from accreting onto metal-line white dwarf stars [PDF]

, 2004
The widely accepted assumption is that metals detected in the spectra of a few cool helium-rich white dwarfs cannot be of primordial origin and therefore must be accreted from the interstellar medium. However, the observed abundances of hydrogen are much
S. Friedrich, S. Jordan, Detlev Koester Max-Planck-Institut fur extraterrestrische Physik, Garching, Germany., I. F. A. U. Astrophysik, U. Tubingen, A. Rechen-Institut, Heidelberg, I. F. T. Astrophysik, U. Kiel   +10 more
semanticscholar   +1 more source

A broadband study of FRB 20240114A with the Effelsberg 100-m radio telescope

Astronomy & Astrophysics
Context. FRB 20240114A is a hyperactive repeating fast radio burst (FRB) source discovered by the CHIME/FRB Collaboration in January 2024. The source has been followed up by numerous radio telescopes, including MeerKAT, uGMRT, and FAST, and has been ...
Limaye P., Spitler L. G., Manaswini N., Benáček J., Eppel F., Kadler M., Nicotera L., Wongphechauxsorn J.   +7 more
doaj   +1 more source

Composition Determination from Strain Relaxation in 4D-STEM

Applied Physics Express
Composition determination with high spatial resolution is crucial for device engineering of electronic and optoelectronic systems. While scanning transmission electron microscopy (STEM) can infer material composition from strain with high precision ...
F. Otto, L. Niermann, T. Niermann, M. Lehmann   +3 more
doaj   +1 more source

Discovery of a runaway star likely ejected by a Type Iax supernova

Astronomy & Astrophysics
Over the past decade, runaway stars believed to originate either as surviving donors of Type Ia supernovae or as partially deflagrated accretors producing Type Iax supernovae, have been identified. While the former have been extensively studied recently,
Bhat A., Hollands M., Dorsch M., Geier S., Heber U., Koester D., Pakmor R., Shen K. J.   +7 more
doaj   +1 more source

Hadron Spectroscopy with lattice QCD: Challenges and opportunities [PDF]

EPJ Web of Conferences
Ongoing challenges in computing the spectrum of hadronic resonances and shallow bound-states from lattice QCD are reviewed. Since such states are identified as poles in the scattering matrix, nearby non-analyticities must be treated to analytically ...
Bulava John
doaj   +1 more source