Non-Equilibrium Effects on the Optically Thin Radiative Loss Function

Linearized Non-Equilibrium Flow of a Partially Ionized Gas with a Radiative Loss

Journal of the Physical Society of Japan ◽

10.1143/jpsj.20.1476 ◽

1965 ◽

Vol 20 (8) ◽

pp. 1476-1487 ◽

Cited By ~ 2

Author(s):

Toshimitsu Murasaki ◽

Shigeki Morioka

Keyword(s):

Radiative Loss ◽

Equilibrium Flow ◽

Ionized Gas ◽

Partially Ionized ◽

Non Equilibrium

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Effect of coronal elemental abundances on the radiative loss function

The Astrophysical Journal ◽

10.1086/167268 ◽

1989 ◽

Vol 338 ◽

pp. 1176 ◽

Cited By ~ 105

Author(s):

J. W. Cook ◽

C.-C. Cheng ◽

V. L. Jacobs ◽

S. K. Antiochos

Keyword(s):

Loss Function ◽

Radiative Loss ◽

Elemental Abundances

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Instabilities in colliding winds

Symposium - International Astronomical Union ◽

10.1017/s0074180900202623 ◽

1995 ◽

Vol 163 ◽

pp. 525-526

Author(s):

Rolf Walder ◽

Doris Folini

Keyword(s):

Loss Function ◽

Radiative Cooling ◽

Radiative Loss ◽

Stability Properties ◽

Radiated Energy ◽

Collision Zone ◽

Ring Nebula ◽

The Stability ◽

Astrophysical Flows ◽

Colliding Winds

The significance of radiative cooling for the stability properties of colliding astrophysical flows is shown. In the cases of WR ring nebula NGC 6888 and WR binary V444 Cyg it is found that thermal instabilities in the radiative loss function A(T) Tβ, β = β(T) not only have an influence on the dynamics of the collision zone, but also that they lead to a quasi-periodic increase of the radiated energy.

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Valence electron spectroscopy of inhomogeneous media

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100130389 ◽

1992 ◽

Vol 50 (2) ◽

pp. 1150-1151

Author(s):

A. Howie ◽

D.W. McComb

Keyword(s):

Specific Gravity ◽

Loss Function ◽

Electron Spectroscopy ◽

Valence Electron ◽

Peak Height ◽

Loss Functions ◽

Loss Peak ◽

High Energies ◽

Valence Electron Density ◽

Electron Microscopist

The bulk loss function Im(-l/ε (ω)), a well established tool for the interpretation of valence loss spectra, is being progressively adapted to the wide variety of inhomogeneous samples of interest to the electron microscopist. Proportionality between n, the local valence electron density, and ε-1 (Sellmeyer's equation) has sometimes been assumed but may not be valid even in homogeneous samples. Figs. 1 and 2 show the experimentally measured bulk loss functions for three pure silicates of different specific gravity ρ - quartz (ρ = 2.66), coesite (ρ = 2.93) and a zeolite (ρ = 1.79). Clearly, despite the substantial differences in density, the shift of the prominent loss peak is very small and far less than that predicted by scaling e for quartz with Sellmeyer's equation or even the somewhat smaller shift given by the Clausius-Mossotti (CM) relation which assumes proportionality between n (or ρ in this case) and (ε - 1)/(ε + 2). Both theories overestimate the rise in the peak height for coesite and underestimate the increase at high energies.

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Application of analytical electron microscopy to studies of equilibrium and non-equilibrium segregation in materials

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100130705 ◽

1992 ◽

Vol 50 (2) ◽

pp. 1214-1215

Author(s):

Edward A Kenik

Keyword(s):

Electron Microscopy ◽

Analytical Electron Microscopy ◽

Extended Defects ◽

Probe Diameter ◽

Specimen Holder ◽

Analytical Electron ◽

Scanning Transmission ◽

Solute Atoms ◽

Equilibrium Segregation ◽

Non Equilibrium

Segregation of solute atoms to grain boundaries, dislocations, and other extended defects can occur under thermal equilibrium or non-equilibrium conditions, such as quenching, irradiation, or precipitation. Generally, equilibrium segregation is narrow (near monolayer coverage at planar defects), whereas non-equilibrium segregation exhibits profiles of larger spatial extent, associated with diffusion of point defects or solute atoms. Analytical electron microscopy provides tools both to measure the segregation and to characterize the defect at which the segregation occurs. This is especially true of instruments that can achieve fine (<2 nm width), high current probes and as such, provide high spatial resolution analysis and characterization capability. Analysis was performed in a Philips EM400T/FEG operated in the scanning transmission mode with a probe diameter of <2 nm (FWTM). The instrument is equipped with EDAX 9100/70 energy dispersive X-ray spectrometry (EDXS) and Gatan 666 parallel detection electron energy loss spectrometry (PEELS) systems. A double-tilt, liquid-nitrogen-cooled specimen holder was employed for microanalysis in order to minimize contamination under the focussed spot.

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