Results 61 to 70 of about 151,210 (305)

An Introduction to Accretion Disks

, 2013
International audienceIn this chapter I first present the pre-main sequence stars around which accretion disks are observed and summarise the main observed characteristics of the classical T Tauri and Herbig Ae/Be stars. I then review the theoretical and
Alecian, Evelyne, E. Alecian
core   +1 more source

Mitigating Creep Anisotropy and Enhancing Performance in Additively Manufactured Ni‐Based Superalloys: A Review

Advanced Engineering Materials, EarlyView.
Additive manufacturing introduces pronounced microstructural and crystallographic anisotropy in Ni‐based superalloys, resulting in orientation‐dependent creep deformation and damage. This review identifies the key microstructural origins of creep anisotropy, examines their influence on dominant deformation mechanisms, and highlights processing ...
Chandan Kumar, Shobhit Pratap Singh, Gaurav Mohanty, Praveen Kumar   +3 more
wiley   +1 more source

Inherent Self-consistency of the Electron Fraction between Neutrino-dominated Accretion Flows and Their Progenitors

The Astrophysical Journal
Stellar-mass black holes (BHs) surrounded by neutrino-dominated accretion flows (NDAFs) are a leading central engine of gamma-ray bursts (GRBs). In this work, we investigate the electron fraction distribution in NDAFs with or without disk outflows for ...
Rui-Qi Cui, Tong Liu
doaj   +1 more source

Testing supermassive black hole quasi-periodic oscillation frequency scaling with latent-mass Bayesian inference

Astronomy & Astrophysics
Context. High-frequency quasi-periodic oscillations (QPOs) in supermassive black-hole systems provide a potential probe of the frequency scale in the innermost accretion flow.
Vrba Jaroslav, Rayimbaev Javlon
doaj   +1 more source

Dynamo–Action in Accretion Disks [PDF]

Symposium - International Astronomical Union, 1993
Accretion disks are approximated by thin tori and the generation of magnetic fields by torus–dynamos is investigated. Solutions for the general α2ω–dynamo embedded into vacuum and into an ideally conducting medium are presented. Whereas the former solutions are qualitatively similar to those obtained for thin disks, there is a mode for the latter ...
openaire   +1 more source

Thermal continua of AGN accretion disks [PDF]

, 1994
We have computed the thermal continuum energy distribution of thermal radiation from the atmospheres of supermassive accretion disks around supermassive black holes.
Coleman, H. H., Shields, G. A.
core  

Thermal Cycle–Microstructure–Property Relationships in Rail Steel Heat‐Affected Zone Simulated by Gleeble

Advanced Engineering Materials, EarlyView.
Microstructural evolution of premium rail steel during flash butt welding (FBW), comparing physically simulated heat‐affected zones with actual weld regions. Thermal cycles induce phase transformations and microstructural heterogeneity that influence weld quality and mechanical performance. These findings provide insights into optimizing FBW parameters
Emmanoelle Cintra da Cunha Araújo, João Marcos da Silva Nunes, Marcelly Cristiny Nunes de Carvalho, Alex Rojas, Cristie Luis Kugelmeier, Cristhian Ricardo Loayza Loayza, João Carlos Ferreira, Maria Veronica Goncalves Rodrigues, Rute Sayuri Kano, Isaac Araújo Furtado, Jacyara Dalylla da Silva Nunes, Jhonatan Peres de Sousa, Marcos Natan da Silva Lima, Eden Santos Silva, Gedeon Silva Reis, Samuel Filgueiras Rodrigues   +15 more
wiley   +1 more source

Understanding Balmer Decrements in T Tauri Stars in Terms of Multiflow Magnetospheric Accretion

The Astrophysical Journal
Magnetospheric accretion is the paradigm for accretion in classical T Tauri stars (CTTSs). However, the standard, one-flow magnetospheric accretion model fails to replicate important characteristics such as the observed Balmer decrements. We address this
Naiara Patiño, Nuria Calvet, Gladis Magris, Marbely Micolta, Thanawuth Thanathibodee, Thomas K. Waters, María José Colmenares   +6 more
doaj   +1 more source

Radiatively Inefficient Accretion Disks [PDF]

, 2001
To appear in: The neutron star black hole connection (NATO ASI ELOUNDA 1999) ed. C. Kouveliotou et al.
openaire   +2 more sources

PROPERTIES OF GRAVITOTURBULENT ACCRETION DISKS [PDF]

The Astrophysical Journal, 2009
We explore the properties of cold gravitoturbulent accretion disks - non-fragmenting disks hovering on the verge of gravitational instability - using a realistic prescription for the effective viscosity caused by gravitational torques. This prescription is based on a direct relationship between the angular momentum transport in a thin accretion disk ...
openaire   +2 more sources