Results 71 to 80 of about 22,488,979 (349)

Searching for Binary Stars in Planetary Nebulae Using the ISIS Image Subtraction Software [PDF]

, 2011
We explored the theory that binary central stars of planetary nebulae may be contributing factor in the formation of planetary nebulae. We searched for this photometric variability in central stars of planetary nebulae because consistent periodic ...
Schwartz, Samantha
core   +2 more sources

THE PLANETARY SYSTEM TO KIC 11442793: A COMPACT ANALOGUE TO THE SOLAR SYSTEM [PDF]

, 2013
We announce the discovery of a planetary system with seven transiting planets around a Kepler target, a current record for transiting systems. Planets b, c, e, and f are reported for the first time in this work.
J. Cabrera, S. Csizmadia, H. Lehmann, R. Dvorak, D. Gandolfi, D. Gandolfi, H. Rauer, H. Rauer, A. Erikson, C. Dreyer, P. Eigmüller, A. Hatzes   +11 more
semanticscholar   +1 more source

Ideal Molecular Sieving with a Dense MOF for Helium Upgrading with Highly Diffusion Selective Mixed Matrix Membranes

Advanced Functional Materials, EarlyView.
The separation of Helium gas from natural gas is challenging but highly important. MIL‐116(Ga), a “non‐porous” metal–organic framework is used as a molecular sieve to separate He from CH4. Druse‐like MIL‐116(Ga) particles are integrated into polysulfone mixed matrix membranes.
Ayisha Komal, Laura Calderón‐Rodríguez, Oksana Smirnova, Eren Grossmann, Aparna Binu Varghese, Karen Marlenne Garcia Alvarez, Andreas Schneemann, Thomas Hoyer, Ralf Wyrwa, Felix Helmut Schacher, Alexander Knebel   +10 more
wiley   +1 more source

The scattering of small bodies in planetary systems: constraints on the possible orbits of cometary material

, 2011
The scattering of small bodies by planets is an important dynamical process in planetary systems. We present an analytical model to describe this process using the simplifying assumption that each particle's dynamics is dominated by a single planet at a ...
A. Bonsor, Alcock, Backman, Barnes, Beichman, Bonsor, Booth, Chambers, Churcher, de Elía, Debes, di Sisto, Duncan, Duncan, Emel’yanenko, Farihi, Farihi, Farihi, Gaidos, Gladman, Gladman, Greaves, Gulbis, Gänsicke, Holman, Horner, Horner, Jura, Jura, Kalas, Kilic, Klein, Koester, Kuchner, Levison, Levison, Lykawka, M. C. Wyatt, Marois, Marois, Melis, Moerchen, Moons, Morbidelli, Morbidelli, Morbidelli, Murray, Nesvorný, Nesvorný, Raymond, Reidemeister, Smith, Song, Tiscareno, Tisserand, Tremaine, Villaver, von Hippel, Wisdom, Wyatt, Wyatt, Wyatt, Zuckerman   +62 more
core   +1 more source

Research on Kinematics and Efficiency Calculation of Binary Logic Planetary Gearbox Based on Graph Theory

Applied Sciences
In this paper, the graph theory model of the kinematics of the double internal meshing planetary gear is established by splitting the k value of the planetary gear, the system matrix of the dual-state logic planetary gear transmission is assembled, the ...
Qiang Zhang, Zhe Wu, Jingtao Shen, Suxiao Cui, Yanping Cui   +4 more
doaj   +1 more source

A DETAILED ANALYSIS OF THE HD 73526 2:1 RESONANT PLANETARY SYSTEM [PDF]

, 2013
We present six years of new radial velocity data from the Anglo-Australian and Magellan Telescopes on the HD 73526 2:1 resonant planetary system. We investigate both Keplerian and dynamical (interacting) fits to these data, yielding four possible ...
R. Wittenmyer, Xianyu Tan, Xianyu Tan, M. Lee, J. Horner, C. Tinney, R. P. Butler, G. Salter, B. Carter, H. R. Jones, S. O’Toole, J. Bailey, Duncan J. Wright, J. Crane, S. Schectman, P. Arriagada, I. Thompson, D. Minniti, M. Díaz   +18 more
semanticscholar   +1 more source

Highly Efficient 3D‐Printed PVDF‐Based Triboelectric Nanogenerators Featuring Polymorphic Perovskite Nanofillers

Advanced Functional Materials, EarlyView.
This study demonstrates the use of a low‐cost 3D printing technique to prepare a large‐area PVDF‐FAPbI3 composite dielectric film for flexible TENG application. The δ→α phase transformation of the FAPbI3 nanofillers has significantly improved the β‐phase content, morphology, and dielectric properties of the PVDF film.
Nurfatin Hafizah Zain Karimy, Hai Li, Hock Beng Lee, Devi Prashad Ojha, Manoj Mayaji Ovhal, Vasanthan Devaraj, Sooman Lim, Jae‐Wook Kang   +7 more
wiley   +1 more source

Equilibria in the secular, non-coplanar two-planet problem

, 2009
We investigate the secular dynamics of a planetary system composed of the parent star and two massive planets in mutually inclined orbits. The dynamics are investigated in wide ranges of semi-major axes ratios (0.1-0.667), and planetary masses ratios (0 ...
Adams, Brouwer, Brumberg, Butler, Cezary Migaszewski, Fabrycky, Ferraz-Mello, Ferrer, Fischer, Fischer, Ford, Goździewski, Goździewski, Goździewski, Goździewski, Innanen, Ji, Khalil, Kinoshita, Kozai, Krasinsky, Krzysztof Goździewski, Laskar, Laskar, Lee, Libert, Libert, Libert, Lidov, Lidov, Markeev, Meyer, Michtchenko, Michtchenko, Michtchenko, Migaszewski, Migaszewski, Migaszewski, Miller, Morbidelli, Murray, Press, Rodríguez, Sokolskii, Thomas, Thommes, Veras, Veras, Wright   +48 more
core   +1 more source

Backlash Analysis of Gear Transmission of Parallel Uniform Planetary Gear

Jixie chuandong, 2018
Based on the NGW planetary gear transmission system,a gear transmission of parallel uniform planetary gear is proposed to reduce the transmission error of asteroid transmission system and improve its transmission accuracy.
Guo Jing, Zhu Zengbao, Liu Chun, Zhang Biao   +3 more
doaj  

POSSIBLE TRANSIT TIMING VARIATIONS OF THE TrES-3 PLANETARY SYSTEM [PDF]

, 2013
Five newly observed transit light curves of the TrES-3 planetary system are presented. Together with other light-curve data from the literature, 23 transit light curves in total, which cover an overall timescale of 911 epochs, have been analyzed through ...
I. Jiang, L. Yeh, Parijat Thakur, Yu-Ting Wu, Ping Chien, Yi-Ling Lin, Hong-Yu Chen, Juei-Hwa Hu, Zhao Sun, J. Ji   +9 more
semanticscholar   +1 more source