Results 81 to 90 of about 35,614 (300)

Accretion Disks in the Sub-Stellar Realm: Properties and Evolution [PDF]

Proceedings of the International Astronomical Union, 2009
AbstractIt is now well established that young brown dwarfs harbor accretion disks –and thus undergo a T Tauri phase– similar to their low-mass stellar counterparts. The supporting evidence includes infrared and millimeter observations of the dust component as well as optical and infrared spectra with signatures of gas accretion and outflow.
openaire   +1 more source

Creep Properties and Deformation Mechanism of Additively Manufactured NiAl‐CrMo Composites

Advanced Engineering Materials, EarlyView.
Additively manufactured NiAl‐CrMo composites contain numerous interfaces and cell boundaries that control their creep response. At 700°C under high applied stress, creep is dominated by dislocation‐controlled power‐law mechanisms. At 800°C–900°C and lower stresses, creep is primarily diffusion‐controlled along cell boundaries.
Jan Vollhüter, Andreas Bezold, Johan Westraadt, Katharina Fiegl, Subham Chattoraj, Benjamin Wahlmann, Carolin Körner, Michael Mills, Mathias Göken, Steffen Neumeier   +9 more
wiley   +1 more source

The Population of Massive Stars in Active Galactic Nuclei Disks

The Astrophysical Journal
Gravitational instability in the outskirts of active galactic nuclei (AGN) disks leads to disk fragmentation and formation of ∼300 M _⊙ supermassive stars with potentially long lifetimes.
Yi-Xian Chen, Douglas N. C. Lin
doaj   +1 more source

Viscous diffusion and photoevaporation of stellar disks [PDF]

, 2002
The evolution of a stellar disk under the influence of viscous evolution, photoevaporation from the central source, and photoevaporation by external stars is studied. We take the typical parameters of TTSs and the Trapezium Cluster conditions.
Beauge C., Calvet N., Doug Johnstone, Isamu Matsuyama, Larson R. B., Lee Hartmann, Lynden-Bell D., Shakura N. I.   +7 more
core   +4 more sources

Direct Metal Deposition of Graphene–Ti28Nb35.4Zr Matrix Composites With Enhanced Mechanical, Corrosion, and Biocompatibility Properties for Bone Implants

Advanced Engineering Materials, EarlyView.
Graphene nanoplatelet (0.1 wt.%) reinforcement significantly enhances the performance of β Ti‐28Nb‐35.4Zr alloy. Grain refinement, reduced water contact angle, and improved surface characteristics promote osteoblast adhesion and complete surface coverage after 7 days.
Khurram Munir, Jixing Lin, Yuncang Li, Li Zhu, Paul F. A. Wright, Cuie Wen   +5 more
wiley   +1 more source

On the circum(sub)stellar environment of brown dwarfs in Taurus [PDF]

, 2007
Aims : We want to investigate whether brown dwarfs (BDs) form like stars or are ejected embryos. We study the presence of disks around BDs in the Taurus cloud, and discuss implications for substellar formation models.
A. Noriega-Crespo, Alexander, Allard, Andrews, Baraffe, Barrado y Navascués, Bate, Bate, Bate, Beckwith, Briceño, Briceño, C. Pinte, Chabrier, Chauvin, Cohen, D. L. Padgett, Delgado-Donate, Draine, Draine, Draine, Duchêne, F. Ménard, Fazio, Gomez, Goodwin, Goodwin, Goodwin, Guieu, Guieu, Hartmann, J.-L. Monin, Jayawardhana, Jayawardhana, Kenyon, Klein, Kroupa, Kroupa, L. M. Rebull, Lada, Liu, Luhman, Luhman, Luhman, Lépin, M. Fukagawa, M. Guedel, Martín, Meyer, Mizuno, Mohanty, Monin, Muzerolle, Natta, Padoan, Pascucci, Reach, Reipurth, Rieke, S. Guieu, S. J. Carey, Scholz, Sterzik, T. Huard, Werner, Whelan, White, Whitworth   +67 more
core   +5 more sources

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

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

Transitional disks and their origins: an infrared spectroscopic survey of Orion A

, 2013
Transitional disks are protoplanetary disks around young stars, with inner holes or gaps which are surrounded by optically thick outer, and often inner, disks.
Arnold, Laura, Calvet, Nuria, Espaillat, Catherine, Forrest, W. J., Furlan, Elise, Green, Joel D., Kim, K. H., Manoj, P., Megeath, Tom, Muzerolle, James, Najita, Joan, Sargent, Benjamin, Watson, Dan M.   +12 more
core   +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