Results 121 to 130 of about 35,614 (300)

Nonideal Magnetohydrodynamic Instabilities in Protoplanetary Disks: Vertical Modes and Reflection Asymmetry

The Astrophysical Journal
Magnetized disk winds and wind-driven accretion are an essential and intensively studied dispersion mechanism of protoplanetary disks (PPDs). However, the stability of these mechanisms has yet to be adequately examined.
Lile Wang, Sheng Xu, Zhenyu Wang, Min Fang, Jeremy Goodman   +4 more
doaj   +1 more source

Stability of black hole accretion disks

EPJ Web of Conferences, 2012
We discuss the issues of stability of accretion disks that may undergo the limit-cycle oscillations due to the two main types of thermal-viscous instabilities.
Czerny B., Misra R., Janiuk A., Kunert-Bajraszewska M.   +3 more
doaj   +1 more source

Deep XMM-Newton observation of the Eta Chamaleontis cluster

, 2010
The members of the Eta Chamaleontis cluster are in an evolutionary stage in which disks are rapidly evolving. It also presents some peculiarities, such as the large fraction of binaries and accretion disks, probably related with the cluster formation ...
Alecian, Arnaud, Baraffe, Brickhouse, Briggs, Buscombe, Böhm, Caballero, Caballero, Clausen, Crespo-Chacón, Damiani, Della Ceca, Favata, Flaccomio, Franciosini, Frink, Guenther, Gómez de Castro, Güdel, Haisch, J. F. Albacete Colombo, J. López-Santiago, Jayawardhana, Köhler, Lawson, Luhman, Lyo, Lyo, Lyo, López-Santiago, López-Santiago, López-Santiago, M. A. López-García, Mamajek, Mamajek, Marconi, Marino, Megeath, Moraux, Morrison, Murphy, Preibisch, Robrade, Sacco, Schmitt, Sicilia-Aguilar, Siess, Skrutskie, Smith, Song, Stelzer, Stelzer, Stelzer   +53 more
core   +1 more source

Mhd waves in stellar winds and accretion disks

, 2000
"Alfv?en waves have been used to explain the heating of stellar coronae andthe production of stellar winds in many regions of the Hertzsprung-Russell (HR)diagram. The waves were used as a major acceleration mechanism in the wind ofprotostars, late-type stars, early-type stars and in the solar wind.
M. J. Vasconcelos, V. Jatenco Pereira, R. Opher   +2 more
openaire   +1 more source

The Disks and Accretion Behavior of Young Stellar Objects

, 2011
Zirkumstellare Scheiben spielen eine entscheidende Rolle im Prozess der Sternentstehung und gelten darüberhinaus als die Geburtsstätten neuer Planetensysteme. Notwendig zum Verständnis der Planetenund Sternentstehung ist daher das Wissen um die Entwicklung zirkumstellarer Akkretionsscheiben in Abhängigkeit von der stellaren Umgebung.
openaire   +2 more sources

Multiplex Modular Nanorobotic Systems with Catalytic Activity under Magnetic Navigation

Advanced Functional Materials, EarlyView.
We present modular nanorobots composed of a magnetic propulsion module and different extension modules carrying functional activities, assembled via DNA base pairing. The system integrates propulsion, optical tracking, enzymatic catalysis, and cell docking in a programmable manner.
Voichita Mihali, Xinan Huang, Lucie Motyckova, Nicolas Moreno Gomez, Michal Skowicki, Cora‐Ann Schoenenberger, Peer Fischer, Cornelia G. Palivan   +7 more
wiley   +1 more source

The ODYSSEUS Survey. Characterizing Magnetospheric Geometries and Hotspot Structures in T Tauri Stars

The Astrophysical Journal
Magnetospheric accretion is a key process that shapes the inner disks of T Tauri stars, controlling mass and angular momentum evolution. It produces strong ultraviolet and optical emission that irradiates the planet-forming environment.
Caeley V. Pittman, Catherine C. Espaillat, Connor E. Robinson, Thanawuth Thanathibodee, Sophia Lopez, Nuria Calvet, Zhaohuan Zhu, Frederick M. Walter, John Wendeborn, Carlo F. Manara, Justyn Campbell-White, Rik Claes, Min Fang, Antonio Frasca, Jorge F. Gameiro, Manuele Gangi, Jesus Hernández, Ágnes Kóspál, Karina Maucó, James Muzerolle, Michał Siwak, Łukasz Tychoniec, Laura Venuti   +22 more
doaj   +1 more source

Magnetically Driven Warping and Precession of Accretion Disks: Implications for Exotic Stellar Variabilities [PDF]

International Astronomical Union Colloquium, 2002
AbstractThe inner region of the accretion disk around a magnetized star is subjected to magnetic torques that induce warping and precession of the disk. These torques arise from interactions between the stellar field and the induced electric currents in the disk.
openaire   +2 more sources

Achieving High ON State Current through Ferroelectric Polarization‐Dependent Interfacial Resistance Switching in Undoped Orthorhombic HfO2 Films

Advanced Functional Materials, EarlyView.
Ferroelectric tunnel junction devices based on epitaxial undoped ferroelectric HfO2 films demonstrate stable switching endurance of over 106 switching cycles, low write voltages of ±3 V, 16 measured resistance states, and neuromorphic capability.
Markus Hellenbrand, Nuno Estrócio, Ji S. Kim, Babak Bakhit, Marian C. Istrate, Corneliu Ghica, Tiago Rebelo, Nives Strkalj, Abin Varghese, Bernardo Almeida, Luís S. Marques, Bipin Rajendran, Judith L. MacManus‐Driscoll, José P. B. Silva   +13 more
wiley   +1 more source

Balancing Electrons to Break the Activity‐Selectivity Trade‐Off in H2O2 Electrosynthesis

Advanced Functional Materials, EarlyView.
Carrier‐concentration balancing in CuS is achieved by coupling cobalt dopants with cobalt vacancies, converting CuS from p‐ to n‐type to accelerate 2e− ORR while withdrawing excess carriers to optimize *OOH binding for H2O2 desorption. The catalyst reaches 8.14 mol g−1 h−1 with >84% selectivity in 1.0 M KOH and drives robust electro‐Fenton dye ...
Hangning Liu, Changhui Sun, Luyao Wang, Yuhang Cheng, Yi Xin, Xuyun Guo, Hui Li, Valeria Nicolosi, Yuhai Dou, Peng Li, Tianyi Ma, Jie Wang   +11 more
wiley   +1 more source