Results 71 to 80 of about 282,866 (344)

Non-LTE Sodium Abundance in Galactic Thick- and Thin-Disk Red Giants

, 2014
We evaluate non-local thermodynamical equilibrium (non-LTE) line formation for neutral sodium in model atmospheres of the 79 red giants using the model atom that incorporates the best available atomic data.
Alexeeva, S. A., Mashonkina, L. I., Pakhomov, Yu. V.   +2 more
core   +1 more source

A Toy Model for Blandford-Znajek Mechanism [PDF]

, 1999
A toy model for the Blandford-Znajek mechanism is investigated: a Kerr black hole with a toroidal electric current residing in a thin disk around the black hole.
B. Carter, B. Linet, B. Paczyński, B. Paczyński, C. F. Gammie, D. A. Macdonald, D. Macdonald, I. D. Novikov, J. A. Petterson, J. Bicak, J. Krolik, K. S. Thorne, Li-Xin Li, M. C. Begelman, M. J. Rees, M. Livio, P. Ghosh, P. J. Armitage, R. D. Blandford, R. D. Blandford, R. D. Blandford, R. L. Znajek, R. Penrose, S. E. Wooseley   +23 more
core   +3 more sources

Novel Surface‐Based Bézier Metamaterials: A Higher Degree of Parametrization toward Tailoring the Effective Properties under Compression

Advanced Engineering Materials, EarlyView.
Cubic Bézier curves are used in the synthesis of novel surface‐based metamaterials with tunable mechanical properties. Surface‐based geometries are 3D printed and tested in compression. The resulting mechanical properties are correlated to changes in the shape of the base curve, with high potential in energy absorption through the adjustment of their ...
Alberto Álvarez‐Trejo, Enrique Cuan‐Urquizo, Armando Roman‐Flores   +2 more
wiley   +1 more source

Cutting-Edge High-Power Ultrafast Thin Disk Oscillators

Applied Sciences, 2013
A growing number of applications in science and industry are currently pushing the development of ultrafast laser technologies that enable high average powers.
Thomas Südmeyer, Matthias Golling, Christian Kränkel, Kolja Beil, Martin Hoffmann, Cyrill R. E. Baer, Oliver H. Heckl, Cinia Schriber, Florian Emaury, Clara J. Saraceno, Ursula Keller   +10 more
doaj   +1 more source

Radiation Transport Two-temperature GRMHD Simulations of Warped Accretion Disks

The Astrophysical Journal Letters, 2023
In many black hole (BH) systems, the accretion disk is expected to be misaligned with respect to the BH spin axis. If the scale height of the disk is much smaller than the misalignment angle, the spin of the BH can tear the disk into multiple ...
M. T. P. Liska, N. Kaaz, G. Musoke, A. Tchekhovskoy, O. Porth   +4 more
doaj   +1 more source

Three-Dimensional Simulations of Magnetized Thin Accretion Disks around Black Holes: Stress in the Plunging Region

, 2008
We describe three-dimensional general relativistic magnetohydrodynamic simulations of a geometrically thin accretion disk around a non-spinning black hole. The disk has a thickness $h/r\sim0.05-0.1$ over the radial range $(2-20)GM/c^2$.
Afshordi, Alexander Tchekhovskoy, Beckwith, Beckwith, Charles F. Gammie, Davis, De Villiers, Gammie, Gammie, Gammie, Jeffrey E. McClintock, Jonathan C. McKinney, Krolik, Krolik, Krolik, Liu, McClintock, McKinney, Noble, Novikov, Paczyński, Ramesh Narayan, Rebecca Shafee, Reynolds, Shafee, Shafee, Shakura   +26 more
core   +1 more source

Vortices in Thin, Compressible, Unmagnetized Disks [PDF]

The Astrophysical Journal, 2005
8 pages, 10 figures (high resolution figures available in ApJ electronic edition)
Bryan M. Johnson, Charles F. Gammie
openaire   +4 more sources

Impact of Hot Isostatic Pressing on Microstructure Evolution and Creep Performance of Powder Bed Fusion–Laser Beam Processed CM247LC

Advanced Engineering Materials, EarlyView.
The influence of Hot Isostatic Pressing (HIP) temperature on the microstructure and creep performance of powder bed fusion–laser beam processed CM247LC superalloy is investigated. Grain growth and γ’ precipitate evolution are characterized following HIP at varying temperatures.
Ahmed Fardan, Johannes Gårdstam, Eva Oscarsson, Håkan Brodin, Eduard Hryha   +4 more
wiley   +1 more source

Chemical similarities between Galactic bulge and local thick disk red giant stars [PDF]

, 2008
The evolution of the Milky Way bulge and its relationship with the other Galactic populations is still poorly understood. The bulge has been suggested to be either a merger-driven classical bulge or the product of a dynamical instability of the inner ...
A. Alves-Brito, Alonso, Asplund, B. Barbuy, Ballero, Bensby, Bensby, C. Chiappini, Castelli, Cescutti, Chiappini, Collet, Cunha, D. Yong, da Silva, Demarque, Fulbright, Fulbright, Gratton, I. Ramírez, J. Meléndez, K. C. Freeman, K. Cunha, Kennicutt, Lecureur, M. Asplund, M. S. Bessell, McWilliam, Meléndez, Meléndez, Meléndez, Ramírez, Ramírez, Reddy, Rich, Salaris, Stanek, Tinsley, V. V. Smith, van der Kruit, van Leeuwen, Yong, Zoccali   +42 more
core   +2 more sources

Hydrodynamical activity in thin accretion disks [PDF]

New Astronomy Reviews, 2008
To appear in New Astronomy Review, Proc. of "J-P.
Oded Regev, Oded Regev
openaire   +4 more sources