Results 51 to 60 of about 59,557 (297)

The Evolution of Accreting Binaries: From Brown Dwarfs to Supermassive Black Holes

The Astrophysical Journal
Circumbinary accretion occurs throughout the universe, from the formation of stars and planets to the aftermath of major galactic mergers. We present an extensive investigation of circumbinary accretion disks, studying circular binaries with mass ratios (
Alexander J. Dittmann, Geoffrey Ryan
doaj   +1 more source

Nature Of Transition Circumstellar Disks. I. The Ophiuchus Molecular Cloud [PDF]

, 2010
We have obtained millimeter-wavelength photometry, high-resolution optical spectroscopy, and adaptive optics near-infrared imaging for a sample of 26 Spitzer-selected transition circumstellar disks.
Cieza, Lucas A., Evans, Neal J., Harvey, Paul M., Merin, Bruno, Mora, Marcelo D., Orellana, Mariana, Romero, Grisela A., Schreiber, Matthias R., Swift, Jonathan J., Williams, Jonathan P.   +9 more
core   +3 more sources

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

Using the Ca ii Lines in T Tauri Stars to Infer the Abundance of Refractory Elements in the Innermost Disk Region

The Astrophysical Journal
We present a study of the abundance of calcium in the innermost disk of 70 T Tauri stars in the star-forming regions of Chamaeleon I, Lupus, and Orion OB1b. We use calcium as a proxy for the refractory material that reaches the inner disk.
Marbely Micolta, Nuria Calvet, Thanawuth Thanathibodee, Gladis Magris C., Carlo F. Manara, Laura Venuti, Juan Manuel Alcalá, Gregory J. Herczeg   +7 more
doaj   +1 more source

Patterning the Void: Combining L‐Systems with Archimedean Tessellations as a Perspective for Tissue Engineering Scaffolds

Advanced Functional Materials, EarlyView.
This study introduces a novel multi‐scale scaffold design using L‐fractals arranged in Archimedean tessellations for tissue regeneration. Despite similar porosity, tiles display vastly different tensile responses (1–100 MPa) and deformation modes. In vitro experiments with hMSCs show geometry‐dependent growth and activity. Over 55 000 tile combinations
Maria Kalogeropoulou, Kenny A. van Kampen, Pierpaolo Fucile, Carlos Mota, Lorenzo Moroni   +4 more
wiley   +1 more source

Luminosity of accretion disks around rotating regular black holes

European Physical Journal C: Particles and Fields
We study thin accretion disks in the gravitational field of a class of rotating regular black holes. Our objective is to determine the key parameters governing these accretion disks: the radius of the innermost stable circular orbit $$(r_{\textrm{ISCO}})$
Kuantay Boshkayev, Talgar Konysbayev, Yergali Kurmanov, Orlando Luongo, Marco Muccino, Aliya Taukenova, Ainur Urazalina   +6 more
doaj   +1 more source

Far-ultraviolet Spectroscopy of Active Galactic Nuclei with ASTROSAT/UVIT

The Astrophysical Journal, 2023
We study accretion disk emission from eight Seyfert 1–1.5 active galactic nuclei (AGN) using far-ultraviolet (FUV) (1300–1800 Å) slitless grating spectra acquired with AstroSat/UVIT.
Shrabani Kumar, G. C. Dewangan, K. P. Singh, P. Gandhi, I. E. Papadakis, P. Tripathi, L. Mallick   +6 more
doaj   +1 more source

Mechanically Tunable Bone Scaffolds: In Vivo Hardening of 3D‐Printed Calcium Phosphate/Polycaprolactone Inks

Advanced Functional Materials, EarlyView.
A 3D bone scaffold with osteogenic properties and capable of hardening in vivo is developed. The scaffold is implanted in a ductile state, and a phase transformation of the ceramic induces the stiffening and strengthening of the scaffold in vivo. Abstract Calcium phosphate 3D printing has revolutionized customized bone grafting.
Miguel Mateu‐Sanz, Pablo Varela, Laura del‐Mazo‐Barbara, Irene Lodoso‐Torrecilla, Emilio Jiménez‐Piqué, Jordi Franch, Miguel Alaminos, Maria‐Pau Ginebra   +7 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

Wind-accretion disks in wide binaries, second generation protoplanetary disks and accretion onto white dwarfs

, 2012
Mass transfer from an evolved donor star to its binary companion is a standard feature of stellar evolution in binaries. In wide binaries, the companion star captures some of the mass ejected in a wind by the primary star.
Alexander, Andrews, Arnett, Bath, Bath, Bath, Bildsten, Bromley, Busso, Cannizzo, Chambers, Chiang, D'Alessio, de Val-Borro, Duquennoy, Hagai B. Perets, Han, Ireland, Kenyon, Livio, Lynden-Bell, Mastrodemos, Mikolajewska, Noebauer, Perets, Scott J. Kenyon, Shen, Soker, Sokoloski, Waldman, Wang   +30 more
core   +1 more source