Results 71 to 80 of about 151,210 (305)

Theory of Turbulent Accretion Disks

, 2002
In low-mass disks, turbulent torques are probably the most important way of redistributing angular momentum. Here we present the theory of turbulent accretion disks.
Terquem, Caroline E. J. M. L. J., C. E.J.M.L.J. Terquem   +1 more
core   +1 more source

Laser‐Induced Graphene from Waste Almond Shells

Advanced Functional Materials, EarlyView.
Almond shells, an abundant agricultural by‐product, are repurposed to create a fully bioderived almond shell/chitosan composite (ASC) degradable in soil. ASC is converted into laser‐induced graphene (LIG) by laser scribing and proposed as a substrate for transient electronics.
Yulia Steksova, Anna Chiara Bressi, Marina Galliani, Attilio Marino, Gianni Ciofani, Eduardo Machado‐Charry, Hilda Gomez Bernal, Alessandra Francini, Luca Sebastiani, Francesco Greco   +9 more
wiley   +1 more source

Thin accretion disk signatures in hybrid metric-Palatini gravity

European Physical Journal C: Particles and Fields
In the present work, accretion onto a static spherically symmetric black hole in the hybrid metric-Palatini gravity is considered. The Novikov–Thorne model for a relativistic thin accretion disk is used.
Polina Dyadina, Nikita Avdeev
doaj   +1 more source

Protoplanetary disc population synthesis

Astronomy & Astrophysics
Context. Protoplanetary discs are the birthplaces of planets, and their lifetimes determine the time available for planet formation. Recent studies have highlighted the importance of stellar mass sampling when determining disc lifetimes through the ...
Gomez José L., Guilera Octavio M., Miller Bertolami Marcelo M., Castro Martínez Elisa M., Ronco María Paula   +4 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

Lyα Scattering Models Trace Accretion and Outflow Kinematics in T Tauri Systems

The Astrophysical Journal, 2023
T Tauri stars produce broad Ly α emission lines that contribute ∼88% of the total UV flux incident on the inner circumstellar disks. Ly α photons are generated at the accretion shocks and in the protostellar chromospheres and must travel through ...
Nicole Arulanantham, Max Gronke, Eleonora Fiorellino, Jorge Filipe Gameiro, Antonio Frasca, Joel Green, Seok-Jun Chang, Rik A. B. Claes, Catherine C. Espaillat, Kevin France, Gregory J. Herczeg, Carlo F. Manara, Laura Venuti, Péter Ábrahám, Richard Alexander, Jerome Bouvier, Justyn Campbell-White, Jochen Eislöffel, William J. Fischer, Ágnes Kóspál, Miguel Vioque   +20 more
doaj   +1 more source

Biomass Native Structure Into Functional Carbon‐Based Catalysts for Fenton‐Like Reactions

Advanced Functional Materials, EarlyView.
This study indicates that eight biomasses with 2D flaky and 1D acicular structures influence surface O types, morphology, defects, N doping, sp2 C, and Co nanoparticles loading in three series of carbon, N‐doped carbon, and cobalt/graphitic carbon. This work identifies how these structural factors impact catalytic pathways, enhancing selective electron
Wenjie Tian, Jingkai Lin, Zhihao Tian, Selusiwe Ncube, Huayang Zhang, Emiliano Cortés, Hongqi Sun, Shaobin Wang   +7 more
wiley   +1 more source

Multi-Phase Thermal Structure & The Origin of the Broad-Line Region, Torus, and Corona in Magnetically-Dominated Accretion Disks

The Open Journal of Astrophysics
Recent simulations have demonstrated the formation of 'flux-frozen' and hyper-magnetized disks, qualitatively distinct from both classical $\alpha$ disks and magnetically-arrested disks, as a natural consequence of fueling gas to supermassive black holes
Philip F. Hopkins
doaj   +1 more source

Disk Weather

EPJ Web of Conferences, 2013
Recent years have shown that accretion disks around young stars have extended regions, which are too low ionized to couple to magnetic fields and thus the nature of the underlying turbulence cannot be exclusively magnetic. We also found that disks have
Lyra Wlad, Raettig Natalie, Klahr Hubert
doaj   +1 more source

Numerical models of accretion disks [PDF]

AIP Conference Proceedings, 1998
I review recent numerical studies of accretion disks, focusing on measurements of the turbulent shear stress, or $α$, in the shearing box model. I conclude with a list of astronomically relevant open questions that can be settled via future numerical experiments.
openaire   +2 more sources