Results 41 to 50 of about 56,879 (283)

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

Experimental Study of Drag Torque between Wet Clutch Discs

Applied Sciences, 2022
The development of automatic gearbox control systems contributes to their increasing popularity. By raising the number of gears and sophisticated algorithms, the reduction of fuel consumption is feasible regarding traditional manual transmissions. The continuously variable transmissions (CVT) are also growing their share of the market. Wet clutches are
Jarosław Goszczak, Jacek Leyko, Grzegorz Mitukiewicz, Damian Batory   +3 more
openaire   +2 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

Force and torque acting on particles in a transitionally rough open channel flow

, 2011
Direct numerical simulation of open channel flow over a geometrically rough wall has been performed at a bulk Reynolds number of approximately 2900. The wall consisted of a layer of spheres in a square arrangement. Two cases have been considered.
Bayazit, Clemens Chan-Braun, Detert, Manuel García-Villalba, Markus Uhlmann, Nezu, Nikuradse, Pokrajac, Schlichting, Shields, Townsend, Uhlmann, Uhlmann, van Rijn   +13 more
core   +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

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

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  

Pendidikan teknik dan vokasional di kalangan masyarakat orang asli [PDF]

, 2007
Masyarakat Orang Asli adalah golongan unik yang mempunyai pelbagai fahaman dan cara hidup yang berbeza-beza berbanding masyarakat lain di Malaysia. Penguasaan di dalam bidang Pendidikan Teknik dan Vokasional (PTV) akan dapat membantu mereka untuk terus ...
Ahmad Sapawi, Arman
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

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