Results 41 to 50 of about 56,749 (281)

The steady oblique path of buoyancy-driven disks and spheres [PDF]

, 2012
We consider the steady motion of disks of various thicknesses in a weakly viscous flow, in the case where the angle of incidence $\alpha$ (defined as that between the disk axis and its velocity) is small.
Fabre, David, Magnaudet, Jacques, Tchoufag, Joël   +2 more
core   +3 more sources

Liquid Metal Microrobots for Magnetically Guided Transvascular Navigation

Advanced Materials, EarlyView.
Liquid metal‐based microrobots combine magnetic steering, intrinsic X‐ray visibility and softness, to navigate blood vessels even against flow. Under clinically relevant magnetic fields, liquid metal microrobots roll along vessel walls, cross endothelial barriers, and accumulate in target tissues.
Xiaohui Ju, Roshan Velluvakandy, Xianghua Wu, Miguel Angel Merlos Rodrigo, Zbyněk Heger, Kamila Bendíčková, Jan Frič, Martin Pumera   +7 more
wiley   +1 more source

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

Anti‐Slip Material‐Based Strategies and Approaches

Advanced Materials Technologies, EarlyView.
This review highlights the principle mechanisms of slipping at the microscale, linking contact mechanics with a friction behavior model for surface interfaces. Main strategies to develop anti‐slip properties to the surfaces are discussed alongside standardized testing approaches.
Sogand Abbaspoor‐Zanjani, Carlo Antonini, Teresa Gatti, Mengjiao Wang   +3 more
wiley   +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  

Development of Heat Engines Powered by Twisted and Coiled Polymer Fiber Actuators

Advanced Materials Technologies, EarlyView.
Continuously rotating engines driven by thermally responsive actuating materials can turn waste heat into useful energy. For the first time heat engines operated by twisted and coiled polymer fiber actuators are demonstrated with engine design guided by two simple analytical models.
Geoffrey M. Spinks, Burhan Bin Asghar Abbasi, Zhen Jiang   +2 more
wiley   +1 more source

Faster Drilling A Three-dimensional Horizontal Well By Integrating Well Path And BHA Design

Journal of Applied Science and Engineering, 2023
Well path design is an important factor in horizontal drilling. A reasonable well profile scheme can significantly reduce drilling drag and torque, which also can enhance drilling rate.
Yuan Long, Xueying Wang, Qian Zhou, Feifei Zhang, Mingliang Li   +4 more
doaj   +1 more source

Horseshoe drag in three-dimensional globally isothermal disks [PDF]

, 2016
We study the horseshoe dynamics of a low-mass planet in a three-dimensional, globally isothermal, inviscid disk. We find, as reported in previous work, that the boundaries of the horseshoe region (separatrix sheets) have cylindrical symmetry about the ...
Benítez Llambay, Pablo, Masset, F. S.
core   +1 more source

Stable Imitation of Multigait and Bipedal Motions for Quadrupedal Robots Over Uneven Terrains

Advanced Robotics Research, EarlyView.
How are quadrupedal robots empowered to execute complex navigation tasks, including multigait and bipedal motions? Challenges in stability and real‐world adaptation persist, especially with uneven terrains and disturbances. This article presents an imitation learning framework that enhances adaptability and robustness by incorporating long short‐term ...
Erdong Xiao, Yinzhao Dong, Ji Ma, Peng Lu   +3 more
wiley   +1 more source

Tuning the torque-speed characteristics of bacterial flagellar motor to enhance the swimming speed

, 2019
In a classic paper, Edward Purcell analysed the dynamics of flagellated bacterial swimmers and derived a geometrical relationship which optimizes the propulsion efficiency. Experimental measurements for wild-type bacterial species E.
Abdulla, Amith Z., Prakash, Praneet, Singh, Varsha, Varma, Manoj   +3 more
core   +1 more source