Results 101 to 110 of about 145,815 (295)

Theory of protostellar accretion disks [PDF]

, 1994
I will present an overview of the current paradigm for the theory of gaseous accretion disks around young stars. Protostellar disks form from the collapse of rotating molecular cloud cores. The disks evolve via outward angular momentum transport provided
Ruden, S.
core  

Disk evolution, element abundances and cloud properties of young gas giant planets [PDF]

, 2014
ChHc and PBR highlights financial support of the European Community under the FP7 program by an ERC starting grant. PW, IK, and WFT acknowledge funding from the European Union Seventh Framework Programme FP7-2011 under grant agreement No.
Kamp, I., Peter Woitke, Woitke, P., Meijerink, R., Helling, C., Inga Kamp, Christiane Helling, Wing-Fai Thi, Kamp, Inga, Meijerink, Rowin, Woitke, Peter, Kamp, Inga; id_orcid, Rimmer, Paul B., Rowin Meijerink, Rimmer, P.B., Paul B. Rimmer, Thi, W.-F., Thi, Wing-Fai, Helling, Christiane, Paul Rimmer   +19 more
core   +2 more sources

A short-timescale negative optical continuum lag in SDSS J083717.88+191647

Astronomy & Astrophysics
Continuum reverberation mapping (RM) is a powerful technique for constraining the accretion disk structure in active galactic nuclei (AGNs). In typical cases, the shorter-wavelength emission is used as the reference, and a positive time lag is observed ...
Chen Mu-Lin, Cheng Pei-Zhen, Chen Xing-Qian, Gu Ying, Zheng Qi, Liao Gui-Lin, Zhang Xue-Guang   +6 more
doaj   +1 more source

Direct URCA Processes in Supernovae and Accretion Disks with Arbitrary Magnetic Field

EPJ Web of Conferences, 2017
An effect of a magnetic field of an arbitrary strength on the beta-decay and reactions related with it by the crossing symmetry (the beta-processes) in supernovae and accretion disks around black holes is analyzed.
Ognev Igor
doaj   +1 more source

Models of Accretion Disks [PDF]

AIP Conference Proceedings, 2007
An accretion flow onto a supermassive black hole is the primary process powering quasars. However, a geometry of this flow is not well constrained. Both global MHD simulations and observations suggest that there are several emission components present in the nucleus: an accretion disk, hot plasma (corona or sphere) with electrons scattering the optical
openaire   +2 more sources

Load Distributing Metamaterials Via Discrete Optimization

Advanced Functional Materials, EarlyView.
Mechanical metamaterials are computationally optimized to homogenize transmitted forces by minimizing the spread of reaction forces. The resulting architectures transform localized loading into broader, more uniform force distributions and experimentally demonstrate robust load spreading under quasi‐static and impact loading.
Andrea Detry, Hannes Holey, Raja Zulkarnain, Roberto Guerra, Ilaria Papa, Michael Zaiser, Stefano Zapperi   +6 more
wiley   +1 more source

Accretion Regimes of Neutrino-cooled Flows onto Black Holes

The Astrophysical Journal
Neutrino-cooled accretion disks can form in the aftermath of neutron-star mergers as well as during the collapse of rapidly rotating massive stars and the accretion-induced collapse of rapidly rotating white dwarfs.
Javiera Hernández-Morales, Daniel M. Siegel   +1 more
doaj   +1 more source

Long-term evolution of cyclotron resonant scattering features in the accreting pulsar Vela X-1: A pulse-to-pulse approach

Astronomy & Astrophysics
We investigated the long-term evolution of the cyclotron line energy, as well as the relationship between cyclotron line energy and luminosity in the high-mass X-ray binary Vela X-1, based on archival Swift/BAT monitoring from 2005 to 2024 and pulse-to ...
Du Yu-Jia, Wang Peng-Ju, Ducci Lorenzo, Ji Long, Kong Ling-Da, Bu Qing-Cui, Mehrotra Chirag, Santangelo Andrea   +7 more
doaj   +1 more source

An Integrated Oxygen‐Supplying Device and Predictive Multiphysics Model for Extended Ambient Transport of Insulin‐Producing Cells

Advanced Functional Materials, EarlyView.
Cell therapies typically rely on cold‐chain logistics and cryopreservation, limiting access and compromising cell quality. Here, a dual‐chamber device separates an oxygen‐supplying chamber from a hyaluronic acid cargo chamber, sustaining oxygen delivery for over 70 h and enabling ambient‐temperature shipment.
Daniel A. Domingo‐Lopez, Ruth Tarpey, Benjamin Brennan, Bryan D. Boyle, Amir M. Alsharabasy, Abhik Mallick, Gabriella Bellavia, Abhay Pandit, Garry P. Duffy, Ruth E. Levey   +9 more
wiley   +1 more source

The Effects of Complex Accretion Disk Geometry on Broadened Iron Ka Lines

The Astrophysical Journal
X-rays are emitted from the corona above the orbiting matter of the accretion disk and either travel directly to the observer or illuminate the disk. Illumination of the inner disk is enhanced by gravitational light bending, which focuses the rays toward
William Surgent, Daniel R. Wilkins
doaj   +1 more source