Results 41 to 50 of about 50,929 (190)

Motion around a Monopole + Ring system: I. Stability of Equatorial Circular Orbits vs Regularity of Three-dimensional Motion [PDF]

, 2011
We study the motion of test particles around a center of attraction represented by a monopole (with and without spheroidal deformation) surrounded by a ring, given as a superposition of Morgan & Morgan discs. We deal with two kinds of bounded orbits: (i)
Letelier, Patricio S., Pedraza, Juan F., Ramos-Caro, Javier   +2 more
core   +3 more sources

Puffed-up Inner Rings and Razor-thin Outer Rings in Structured Protoplanetary Disks

The Astrophysical Journal
The vertical distribution of pebbles in protoplanetary disks is a fundamental property influencing planet formation, from dust aggregation to the assembly of planetary cores.
Haochang Jiang, Feng Long, Enrique Macías, Myriam Benisty, Kiyoaki Doi, Cornelis P. Dullemond, Ryan A. Loomis, Ilaria Pascucci, Sebastián Pérez, Shangjia Zhang, Zhaohuan Zhu   +10 more
doaj   +1 more source

Jet-Driven Formation of Bipolar Rings in Planetary Nebulae: Numerical Simulations Inspired by NGC 1514

The Open Journal of Astrophysics
We conduct three-dimensional hydrodynamical simulations of jets launched into a dense shell, reproducing two rings in a bipolar structure that resemble the two dusty rings of the planetary nebula (PN) NGC 1514.
Muhammad Akashi, Ealeal Bear, Noam Soker
doaj   +1 more source

Hybrid geared traction transmissions [PDF]

, 1983
The basic configuration of geared traction drives, geometric and structural factors to be considered in their construction, and current work on hybrid helicopter transmissions rated at 500 and 3000 hp are ...
Nasvytis, A. L., White, G.
core   +1 more source

Research on Splash Lubrication Characteristics of the Planetary Gear Train Based on the MPS Method

Jixie chuandong, 2023
In order to analyze the lubrication characteristics of the planetary gear transmission of shield main drive reducers, a simulation model of splash lubrication of the single-stage planetary gear train is established using the moving particle semi-implicit
Shi Lubing, Chen Huixiao, Yan Shidang, Wang Jun, Ding Haohao, Pei Bang, Liu Zhongming, Wang Wenjian   +7 more
doaj  

Evolving Morphology of Resolved Stellar Einstein Rings

The Astrophysical Journal, 2023
We consider strong gravitational lensing by nearby stars. Using our wave-optical treatment of lensing phenomena, we study Einstein rings that may form around nearby stellar lenses.
Slava G. Turyshev, Viktor T. Toth
doaj   +1 more source

The ALMA survey to Resolve exoKuiper belt Substructures (ARKS)

Astronomy & Astrophysics
Context. Debris discs are populated by belts of planetesimals, whose structure carries dynamical imprints of planets and the formation and evolutionary history of the planetary system.
Han Yinuo, Mansell Elias, Jennings Jeff, Marino Sebastian, Hughes A. Meredith, Zawadzki Brianna, Fehr Anna, Kittling Jamar, Hou Catherine, Nurmohamed Aliya, Lee Junu, Cheruiyot Allan, Mpofu Yamani, Booth Mark, Booth Richard, Bonduelle Myriam, Brennan Aoife, del Burgo Carlos, Carpenter John M., Cataldi Gianni, Chiang Eugene, Ertel Steve, Henning Thomas, Jankovic Marija R., Kóspál Ágnes, Krivov Alexander V., Lovell Joshua B., Luppe Patricia, MacGregor Meredith A., Mac Manamon Sorcha, Marshall Jonathan P., Matrà Luca, Milli Julien, Moór Attila, Olofsson Johan, Pearce Tim, Pérez Sebastián, Sefilian Antranik A., Weber Philipp, Wilner David J., Wyatt Mark C.   +40 more
doaj   +1 more source

N-body Simulations of the Self-confinement of Viscous Self-gravitating Narrow Eccentric Planetary Ringlets

The Astrophysical Journal
Narrow eccentric planetary ringlets have sharp edges, sizable eccentricity gradients, and a confinement mechanism that prevents radial spreading due to ring viscosity.
Joseph M. Hahn, Douglas P. Hamilton, Thomas Rimlinger, Yuxi(Lucy) Lu   +3 more
doaj   +1 more source

Radiative transfer in planetary atmospheres [PDF]

A wide range of topics are covered including the following: (1) the observational study of cometary comae via millimeter and radio spectroscopy; (2) observational and theoretical studies of planetary atmospheres at millimeter wavelengths; and (3 ...
Schloerb, F. Peter
core   +1 more source

The Rings of (2060) Chiron: Evidence of an Evolving System

The Astrophysical Journal Letters
The centaur (2060) Chiron has long been a candidate for hosting material in orbit, based on occultation and photometric and spectroscopic data. Here, we present a multichord stellar occultation observed on 2023 September 10 UT that reveals new and ...
C. L. Pereira, F. Braga-Ribas, B. Sicardy, R. Leiva, M. Assafin, B. E. Morgado, J. L. Ortiz, P. Santos-Sanz, J. I. B. Camargo, G. Margoti, Y. Kilic, G. Benedetti-Rossi, R. Vieira-Martins, T. F. L. L. Pinheiro, R. Sfair, F. L. Rommel, A. R. Gomes-Júnior, R. C. Boufleur, R. Duffard, J. Desmars, D. Souami, N. Morales, F. Arrese, K. Barkaoui, A. Burdanov, C. A. Colazo, C. A. Domingues, H. Dutra, R. C. Gargalhone, C. Jacques, F. Jablonski, L. Liberato, R. Melia, J. C. Oliveira, M. Sardiña, J. Spagnotto, T. Speranza, A. Wilberger, M. A. Zorzan, L. S. Brito, J. P. Cavalcante, T. Q. Costa, M. Emilio, E. Garcia-Migani, M. Gillon, E. Gradovski, E. Jehin, V. Lattari, M. Malacarne, L. A. Mammana, M. Melita, W. Melo, A. J. Ortiz, P. Quitral-Manosalva, G. Ramon, I. Rodrigues, L. Vanzi   +56 more
doaj   +1 more source