Results 291 to 300 of about 34,820 (308)

Opacity and radiative power losses calculations

High Energy Density Physics, 2009
In this contribution we present results on opacity and radiative power losses in laser-produced plasmas. We focus our attention on the inner shell transition array 1s-2p in an aluminum plasma. At high densities, electron, Doppler and ion Stark broadening play a role in line merging.
Benredjem, D., Calisti, A., Mosse, C.
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Scaling law of radiative opacities for ICF elements

Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 2001
info:eu-repo/semantics ...
Mínguez, E., Ruíz Pablos, Rosa María, Martel, P., Gil, J.M., Rubiano, J.G., Rodríguez, R.   +5 more
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Radiative opacities for stellar envelopes

Physica Scripta, 1995
Recent advances in the field of opacity calculations for stellar envelopes are summarized. The methods used and the results obtained in the last decade by two independent groups are discussed briefly. Some of the important effects of the new data on astrophysical studies are outlined.
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The Effect of Degeneracy on the Scattering Contribution to the Radiative Opacity [PDF]

The Astrophysical Journal, 1995
The effect of partial free electron degeneracy on the scattering contribution to the radiative opacity is of interest in calculations of the structure and evolution of stars, particularly the Sun, where the plasma at the Sun's center is partially degenerate and scattering is a major contribution to the opacity.
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Radiative opacity due to the red system of CN

Journal of Quantitative Spectroscopy and Radiative Transfer, 1972
Abstract Recent observational and theoretical work has indicated that CN may play a major role in forming the spectrum and in fixing the thermal structure in a wide variety of cool stellar atmospheres. As the first step in investigating that role, we have calculated straight mean absorption coefficients over intervals of 100 cm -1 for the red system
Hollis R. Johnson, Irene R. Marenin, Stephan D. Price   +2 more
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Opacity measurements of a radiatively heated boron sample

Journal of Quantitative Spectroscopy and Radiative Transfer, 1997
Abstract A preliminary measurement of the opacity of a thin boron foil radiatively heated at moderate temperatures (5–20 eV) in conditions near local-thennodynamic-equilibrium (LTE) are reported. The opacity of a 0.37 μm thick boron sample has been measured in the K-shell range (40–60 A) using a 5000 l mm −1 transmission grating.
P. Renaudin, Franck Gilleron, Claude Chenais-Popovics, J.C. Gauthier, T. Miβalla, Hamed Merdji, J. Bruneau, S. Gary   +7 more
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Radiative transfer and opacity calculations

1964
The similarity groups for multicomponent, reacting gas mixtures with radiative energy transport are derived. The resulting relations are used to consider the feasibility of scaling for flow processes with radiative energy transport under highly simplified conditions.
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High-order multipole transitions in radiative opacities

Journal of Quantitative Spectroscopy and Radiative Transfer, 2006
Abstract The opacity code CASSANDRA, developed at AWE, has recently been modified to include all electric and magnetic multipole transitions of up to multipolarity L = 5 in both the bound–bound and bound–free spectra. It is found that the inclusion of these transitions increases the Rosseland mean opacity of moderate-Z elements by a few ...
B.J.B. Crowley, J.W.O. Harris, L.M. Upcraft   +2 more
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Calculation of the Radiative Opacity of a Hot Dense Plasma

Contributions to Plasma Physics, 1999
AbstractResults are presented for a theoretical model, known as the ion model (IM), recently elaborated to calculate the radiative opacity of a hot dense plasma. The model is based on the self‐consistent field method for subsystems obeying Gibbs statistics. The model is applied to compound chemical compositions.
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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, George G. Pavlov, Yu. A. Shibanov, V. E. Zavlin   +3 more
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