Zobrazeno 1 - 10
of 491
pro vyhledávání: '"F. G. Mertens"'
Autor:
H. Gan, L. V. E. Koopmans, F. G. Mertens, M. Mevius, A. R. Offringa, B. Ciardi, B. K. Gehlot, R. Ghara, A. Ghosh, S. K. Giri, I. T. Iliev, G. Mellema, V. N. Pandey, S. Zaroubi
Publikováno v:
Astronomy & astrophysics, 663:A9. EDP Sciences
The detection of the 21 cm signal of neutral hydrogen from the Epoch of Reionization (EoR) is challenging due to bright foreground sources, radio frequency interference (RFI), the ionosphere, and instrumental effects. Even after correcting for these
Autor:
B. K. Gehlot, L. V. E. Koopmans, A. R. Offringa, H. Gan, R. Ghara, S. K. Giri, M. Kuiack, F. G. Mertens, M. Mevius, R. Mondal, V. N. Pandey, A. Shulevski, R. A. M. J. Wijers, S. Yatawatta
Publikováno v:
Astronomy & Astrophysics, 662:A97. EDP Sciences
Astronomy & Astrophysics, 662:A97
Astronomy and astrophysics, 662:A97. EDP Sciences
Astronomy & Astrophysics, 662:A97
Astronomy and astrophysics, 662:A97. EDP Sciences
Aims: Contamination from bright diffuse Galactic thermal and non-thermal radio emission poses crucial challenges in experiments aiming to measure the 21-cm signal of neutral hydrogen from the Cosmic Dawn and Epoch of Reionization. If not included in
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::12aaa5ba5ed2e35717a5c31016b90443
https://hdl.handle.net/1887/3561903
https://hdl.handle.net/1887/3561903
Autor:
H. Gan, F. G. Mertens, L. V. E. Koopmans, A. R. Offringa, M. Mevius, V. N. Pandey, S. A. Brackenhoff, E. Ceccotti, B. Ciardi, B. K. Gehlot, R. Ghara, S. K. Giri, I. T. Iliev, S. Munshi
Publikováno v:
Astronomy & astrophysics, 669:A20. EDP Sciences
Context. Detecting the 21 cm signal from the epoch of reionisation (EoR) has been highly challenging due to the strong astrophysical foregrounds, ionospheric effects, radio frequency interference (RFI), and instrumental effects. Better characterisati
Spin dynamics simulations of two-dimensional clusters with Heisenberg and dipole-dipole interactions
Autor:
Ph. Depondt, F G Mertens
Publikováno v:
Journal of Physics: Condensed Matter
Journal of Physics: Condensed Matter, 2009, 21 (33), pp.336005. ⟨10.1088/0953-8984/21/33/336005⟩
Journal of Physics: Condensed Matter, 2009, 21 (33), pp.336005. ⟨10.1088/0953-8984/21/33/336005⟩
International audience; Spin dynamics with the Landau–Lifshitz equation has provided topics for a wealth of research endeavors. We introduce here a numerical integration method which explicitly uses the precession motion of a spin about the local f
Publikováno v:
Journal of Physics A: Mathematical and General. 26:7589-7613
Gutzwiller's semiclassical quantization scheme for the trace of Green's function is applied to the periodic Toda chain. We obtain a set of algebraic equations that determine the energy levels arising from a special periodic orbit, namely the single c
Autor:
F G Mertens, Frank Göhmann
Publikováno v:
Journal of Physics A: Mathematical and General. 25:649-655
The authors consider the quantum Toda chain in a semiclassical approximation. If the chain is initially in a coherent state and they constrain it to preserve the coherence, its motion is described by effective classical equations. These turn out to b
Publikováno v:
Physical Review B. 44:10066-10078
We investigate the dynamics of the two-dimensional antiferromagnetic Heisenberg model with easy-plane exchange symmetry. We develop a phenomenology of spin-wave and vortex excitations and calculate their contributions to the dynamical correlation fun
Autor:
F. G. Mertens, A. R. Bishop
Publikováno v:
Nonlinear Science at the Dawn of the 21st Century ISBN: 9783540669180
Theories, simulations and experiments on vortex dynamics in quasi-two-dimensional magnetic materials are reviewed. These materials can be modelled by the classical two-dimensional anisotropic Heisenberg model with XY (easy-plane) symmetry. There are
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::d7de5bb9bfa91f70d36f86f64d897e84
https://doi.org/10.1007/3-540-46629-0_7
https://doi.org/10.1007/3-540-46629-0_7
Autor:
Staniloiu A; Department of Physiological Psychology, University of Bielefeld.; Department of Psychology, University of Bucharest.; Psychiatry and Psychosomatics, Oberberg Clinic Hornberg., Markowitsch HJ; Department of Physiological Psychology, University of Bielefeld.
Publikováno v:
Topics in cognitive science [Top Cogn Sci] 2024 May 10. Date of Electronic Publication: 2024 May 10.
Autor:
M E Gouvea, T. Kamppeter, F. G. Mertens, Sarita Leonel, Gary Mathew Wysin, Antonio Sergio Teixeira Pires
We apply the self-consistent harmonic approximation (SCHA) to study static and dynamic properties of the two-dimensional classical Heisenberg model with easy-axis anisotropy. The static properties obtained are magnetization and spin wave energy as fu
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::340900543fb1f69989c3b31309339b98
http://arxiv.org/abs/cond-mat/9902149
http://arxiv.org/abs/cond-mat/9902149