Results 31 to 40 of about 56,758 (188)

Optical alignment and spinning of laser-trapped microscopic particles [PDF]

, 1998
Light-induced rotation of absorbing microscopic particles by transfer of angular momentum from light to the material raises the possibility of optically driven micromachines.
A Ashkin, H He, H. Rubinsztein-Dunlop, M. E. J. Friese, MEJ Friese, N. R. Heckenberg, NB Simpson, RA Beth, T. A. Nieminen, VN Constantinescu   +9 more
core   +2 more sources

Recent developments in planet migration theory

, 2012
Planetary migration is the process by which a forming planet undergoes a drift of its semi-major axis caused by the tidal interaction with its parent protoplanetary disc.
A. Crida, A. Crida, A. Crida, A. Crida, A. Crida, A. Johansen, A. Lagrange, A. Pepliński, A. Pepliński, A. Pepliński, A. Pierens, A.L. Uribe, A.W. Howard, B.A. Ayliffe, C. Baruteau, C. Baruteau, C. Baruteau, C. Baruteau, C. Baruteau, C. Marois, C. Marois, C. Mordasini, C.D. Murray, C.E.J.M.L.J. Terquem, C.F. Gammie, D. Syer, D.G. Korycansky, D.N.C. Lin, D.N.C. Lin, D.N.C. Lin, F. Masset, F. Pepe, F.S. Masset, F.S. Masset, F.S. Masset, F.S. Masset, F.S. Masset, F.S. Masset, F.S. Masset, F.S. Masset, F.S. Masset, G. Bryden, G. D’Angelo, G. D’Angelo, G. D’Angelo, G. D’Angelo, G. D’Angelo, G. Laughlin, G. Lesur, G.I. Ogilvie, H. Jang-Condell, H. Li, H. Tanaka, H. Zhang, H. Zhang, H.H. Klahr, J. Casoli, J. Goodman, J.B. Pollack, J.C.B. Papaloizou, K. Menou, K. Morohoshi, K.C. Schlaufman, K.J. Walsh, L.R. Doyle, M. Mayor, M.K. Lin, M.K. Lin, M.K. Lin, M.K. Lin, M.R. Bate, N.I. Shakura, N.J. Balmforth, P. Artymowicz, P. Artymowicz, P. Goldreich, P. Goldreich, P. Hellary, P.B. Ivanov, R. Dong, R.P. Nelson, R.P. Nelson, R.P. Nelson, R.R. Rafikov, R.V.E. Lovelace, S. Fromang, S. Ida, S. Ida, S. Michael, S. Paardekooper, S. Paardekooper, S.A. Balbus, S.J. Paardekooper, S.J. Paardekooper, S.J. Paardekooper, S.J. Paardekooper, S.J. Paardekooper, T. Fleming, T. Muto, W. Kley, W. Kley, W. Lyra, W. Lyra, W.F. Winters, W.R. Ward, W.R. Ward, W.R. Ward, W.R. Ward, Y. Hasegawa, Z. Zhu   +109 more
core   +3 more sources

Windage measurements in a rotor stator cavity with rotor mounted protrusions and bolts [PDF]

, 2012
This paper reports an experimental investigation of the windage associated with enclosed rotor-stator systems with superposed throughflow, as commonly found in gas turbine engines.
Coren, Daniel, Long, Christopher, Miles, Anna Louise   +2 more
core   +1 more source

Novel Torque and Drag Model for Drilling Two-Dimensional High-Angle Wells

ACS Omega, 2022
Planning high-angle wells involves diverse areas; one of the most important of these areas is torque and drag (T&D) management. Not only could uncontrolled T&D cause various drilling problems like drill string (D/S) failures, casing wear, stuck pipes, and slow rates of penetration but it could also entirely stop the drilling progress, if torque and/or ...
Muhammad Nour, Ahmed A. Elgibaly, Mohamed S. Farahat, Omar Mahmoud   +3 more
openaire   +3 more sources

On the horseshoe drag of a low-mass planet. II Migration in adiabatic disks

, 2009
We evaluate the horseshoe drag exerted on a low-mass planet embedded in a gaseous disk, assuming the disk's flow in the coorbital region to be adiabatic.
Baruteau, Baruteau, F. S. Masset, J. Casoli, Kley, Lovelace, Masset, Masset, Masset, Masset, Tanaka, Ward, Ward   +12 more
core   +1 more source

Stability Analysis and Visual Application of Drill String Drag and Torque Test Device

Shiyou jixie, 2021
The nonlinear buckling of the drill string during drilling affects the safe and stable operation of the drag and torque test device. For the horizontal well drag and torque test device, based on the dynamic software ADAMS, combined with the force balance
Wu Zebing, Zhang Wenchao, Huang Hai, Zhou Kefei, Zhao Haichao, Zheng Weixin   +5 more
doaj  

Turbulent drag in a rotating frame

, 2016
What is the turbulent drag force experienced by an object moving in a rotating fluid? This open and fundamental question can be addressed by measuring the torque needed to drive an impeller at constant angular velocity $\omega$ in a water tank mounted on
Campagne, Antoine, Cortet, Pierre-Philippe, Gallet, Basile, Machicoane, Nathanaël, Moisy, Frédéric   +4 more
core   +3 more sources

Bubbly Turbulent Drag Reduction Is a Boundary Layer Effect [PDF]

, 2007
In turbulent Taylor-Couette flow, the injection of bubbles reduces the overall drag. On the other hand, rough walls enhance the overall drag. In this work, we inject bubbles into turbulent Taylor-Couette flow with rough walls (with a Reynolds number up ...
Berg, Thomas H. van den, Gils, Dennis P.M., Lathrop, Daniel P., Lohse, Detlef   +3 more
core   +2 more sources

Tiltrotor CFD part I: validation [PDF]

, 2017
This paper presents performance analyses of the model-scale ERICA and TILTAERO tiltrotors and of the full-scale XV-15 rotor with high-fidelity computational fluids dynamics.
Barakos, George N., Gates, S., Jimenez Garcia, Antonio   +2 more
core   +1 more source

Analysis of the Influence of Clutch Drag Torque on the Efficiency of Hydro-mechanical Continuously Variable Transmission

Jixie chuandong, 2022
In order to study the influence of multiple clutches on the transmission efficiency of a hydro-mechanical continuously variable transmission （HMCVT），the structure characteristics of a closed loop consisting of multiple wet friction clutches in the ...
Rong Chai, Mingzhu Zhang, Jianhua Wang, Fang Jia   +3 more
doaj