Results 41 to 50 of about 295,732 (310)

Rosseland and flux mean opacities for Compton scattering

, 2016
Rosseland mean opacity plays an important role in theories of stellar evolution and X-ray burst models. In the high-temperature regime, when most of the gas is completely ionized, the opacity is dominated by Compton scattering.
Poutanen, Juri
core   +1 more source

Estimating the Level of Uncertainty in Electron-Impact Excitation and Photoionisation Rates of Low-Ionised Stages of Ni Ions

Galaxies, 2018
Ni iv lines can be used as diagnostics for temperature and density for various astrophysical objects. In addition, ionization of Ni2+ is one of the causes of the opacity in the interstellar medium.
Luis Fernández-Menchero, Catherine A. Ramsbottom, Connor P. Ballance   +2 more
doaj   +1 more source

Grain Physics and Rosseland Mean Opacities

, 2007
Tables of mean opacities are often used to compute the transfer of radiation in a variety of astrophysical simulations from stellar evolution models to proto-planetary disks. Often tables, such as Ferguson et al. (2005), are computed with a predetermined
Amanda Heffner‐Wong, David R. Alexander, Jason W. Ferguson, Jonathan J. Penley, Ossenkopf V., Seaton M. J., Travis S. Barman   +6 more
core   +1 more source

The Effects of Metallicity, and Grain Growth and Settling on the Early Evolution of Gaseous Protoplanets [PDF]

, 2010
Giant protoplanets formed by gravitational instability in the outer regions of circumstellar disks go through an early phase of quasi-static contraction during which radii are large and internal temperatures are low.
Bodenheimer, Peter, Helled, Ravit
core   +1 more source

Low Temperature Opacities

, 2005
Previous computations of low temperature Rosseland and Planck mean opacities from Alexander & Ferguson (1994) are updated and expanded. The new computations include a more complete equation of state with more grain species and updated optical constants ...
Akemi Tamanai, Amanda Heffner‐Wong, Chase M. W., David R. Alexander, France Allard, Gonzalez J.-F., Irwin A. W., Jason W. Ferguson, John T. L., John T. L., John T. L., Jorgensen U. G., Julia G. Bodnarik, Martonchik J. V., Mutschke H., Myerscough V. P., Ordal M. A., Ordal M. A., Ordal M. A., Ossenkopf V., Pegourie B., Peter H. Hauschildt, Schweitzer A., Seaton M. J., Sharp C. M., Travis Barman, Tsuji T., Tsuji T., Vardya M. S., Verner D. A.   +29 more
core   +1 more source

Non-Abelian Energy Loss at Finite Opacity

, 2000
A systematic expansion in opacity, $L/\lambda$, is used to clarify the non-linear behavior of induced gluon radiation in quark-gluon plasmas. The inclusive differential gluon distribution is calculated up to second order in opacity and compared to the ...
B. G. Zhakharov, B. G. Zhakharov, I. Vitev, M. Gyulassy, M. Gyulassy, M. Gyulassy, M. Gyulassy, M. Gyulassy, M. Gyulassy, M. Gyulassy, M. Gyulassy, P. Levai, R. Baier, R. Baier, R. Baier, R. Baier, U. A. Wiedemann, U. A. Wiedemann, U. A. Wiedemann, X.-N. Wang, X.-N. Wang   +20 more
core   +1 more source

Molecular bases of circadian magnesium rhythms across eukaryotes

FEBS Letters, EarlyView.
Circadian rhythms in intracellular [Mg2+] exist across eukaryotic kingdoms. Central roles for Mg2+ in metabolism suggest that Mg2+ rhythms could regulate daily cellular energy and metabolism. In this Perspective paper, we propose that ancestral prokaryotic transport proteins could be responsible for mediating Mg2+ rhythms and posit a feedback model ...
Helen K. Feord, Gerben van Ooijen
wiley   +1 more source

Instabilities in the Envelopes and Winds of Very Massive Stars

, 2014
The high luminosity of Very Massive Stars (VMS) means that radiative forces play an important, dynamical role both in the structure and stability of their stellar envelope, and in driving strong stellar-wind mass loss.
A. A. Belyanin, A. Feldmeier, A. Feldmeier, A. J. Marle van, A. Pauldrach, A. S. Eddington, A. W. Fullerton, C. A. Iglesias, C. D. Levermore, C. F. Gammie, D. F. Figer, D. H. Cohen, E. A. Spiegel, E. A. Spiegel, E. A. Spiegel, E. T. Vishniac, G. C. Pomraning, J. Arons, J. C. B. Papaloizou, J. I. Castor, J. O. Sundqvist, J. O. Sundqvist, J. Petrovic, K. B. MacGregor, K. G. Gayley, L. B. Lucy, L. B. Lucy, L. Dessart, L. M. Oskinova, M. C. Begelman, M. C. Runacres, M. S. Oey, N. Grevesse, N. J. Shaviv, N. J. Shaviv, N. J. Shaviv, N. Smith, N. Smith, N. Smith, O. Blaes, P. A. Crowther, P. C. Joss, R. Kippenhahn, R. P. Kudritzki, S. P. Owocki, S. P. Owocki, S. P. Owocki, S. P. Owocki, S. P. Owocki, S. P. Owocki, T. Quinn, V. V. Sobolev, W. Glatzel, W. Glatzel   +53 more
core   +1 more source

Effect of Foot Orthoses on Midfoot Pain and the Volume of Bone Marrow Lesions in the Midfoot: A Randomized Mechanism of Action Study

Arthritis Care &Research, EarlyView.
Objective Foot orthoses are thought to improve pain by potentially modifying internal mechanical forces. To test this, we explored whether foot orthoses can modify patterns of bone marrow lesions (BMLs) in people with midfoot pain. Methods Forty‐two people were recruited with midfoot pain, and magnetic resonance imaging–confirmed midfoot BMLs ...
Jill Halstead, Anne‐Maree Keenan, Philip G. Conaghan, Dennis McGonagle, Anthony C. Redmond   +4 more
wiley   +1 more source

Deriving surface opacity from serial interactions: the case of Arabic epenthesis

Cogent Arts & Humanities
Vowel epenthesis and stress patterns in Arabic dialects vary widely; understanding their interaction is crucial for phonological theory. This study investigates how different Arabic dialects handle medial CCC clusters and how stress assignment interacts ...
Abdullah Alfaifi
doaj   +1 more source