Results 301 to 310 of about 35,353 (312)

Radiative opacities and photosphere models for soft gamma repeaters

AIP Conference Proceedings, 1996
We consider the radiative processes for conditions expected in photospheres of neutron stars (NSs) with magnetic fields B∼1014–1016 G. The radiative opacities are employed to construct model photospheres and to calculate the spectral flux and specific intensity emitted by these objects which are thought to be associated with Soft Gamma Repeaters (SGRs).
V. G. Bezchastnov, G. G. Pavlov, Yu. A. Shibanov, V. E. Zavlin   +3 more
openaire   +1 more source

Radiative opacity of high-temperature and high-density gold

Physical Review A, 1979
The authors calculate the radiative opacity of gold under conditions representing particle-beam--pellet fusion targets: solid density and a temperature of 750 eV. It is shown that under these conditions the absorption lines form broad bands due to the combined effects of linewidth, electrostatic splitting, and the existence of a distribution of ...
E. Nardi, Z. Zinamon
openaire   +1 more source

Stochastic radiative transfer in random media. III. Effective opacity

Physical Review E
Homogenization of random media is a practical approach to efficiently simulate stochastic radiative transfer, which requires establishing a reliable effective opacity model. In this work, a new effective opacity model is developed by considering the two-point spatial correlations of the opacity fluctuation, which is further simplified by introducing ...
Cong-Zhang Gao, Jian-Wei Yin, Ying Cai, Zheng-Feng Fan, Pei Wang, Jian-Guo Wang   +5 more
openaire   +2 more sources

Some estimates of the radiative Rosseland mean opacity

Journal of Quantitative Spectroscopy and Radiative Transfer, 1967
Abstract The effect of atomic number Z on the Rosseland mean opacity is presented in graphic form for a large range of temperatures and densities. This permits a rapid determination of the dominant process and, in many cases, greatly simplifies the calculation of a good approximation of the Rosseland mean opacity.
openaire   +1 more source

Calculations of the radiative opacity of laser-produced plasmas

Journal of Physics B: Atomic, Molecular and Optical Physics, 1992
The author presents a model for the calculation of the radiative opacity of high-power laser-produced plasmas in local thermodynamic equilibrium (LTE). The model uses detailed configuration accounting in an open shell for both the line and photoelectric absorption.
openaire   +1 more source

Analytical Models of Instantaneous Radiative Forcing Across Opacity Regimes

Journal of Climate
Abstract Radiative forcing by carbon dioxide depends on the difference between surface and stratospheric temperature scaled by the logarithm of its concentration (Wilson and Gea-Banacloche 2012; Jeevanjee et al. 2021). This relationship arises due to the cooling-to-space theory or the τ = 1 law, where all emission of infrared radiation originates from ...
Paulina Czarnecki, Lorenzo Polvani, Robert Pincus   +2 more
openaire   +1 more source

Theoretical isochrones from models with new radiative opacities

1994
In this paper we present large grids of theoretical isochrones for the initial chemical compositions [Z=0.0004, Y=0.23], [Z=0.004, Y=0.24], [Z=0.008, Y=0.25], [Z=0.02, Y=0.28], and [Z= 0.05, Y=0.352] and ages in the range 4 10(6) yr to 16 10(9) yr. These isochrones are derived from stellar models computed with the most recent radiative opacities by ...
Bertelli G., Bressan A., Chiosi, C., Fagottio, F., Nasi, E.   +4 more
openaire   +1 more source

Averaging opacities for radiative transfer problems

Journal of Quantitative Spectroscopy and Radiative Transfer, 2000
openaire   +1 more source

Implicit Opacities in Thermal Radiative Transfer

International Conference on Mathematics and Computational Methods Applied to Nuclear Science and Engineering (M&C 2025)
Samuel Olivier, Quincy Huhn, James Warsa
openaire   +1 more source

Opacity and radiative forces

2011
openaire   +1 more source