Results 71 to 80 of about 62,218 (321)

BINARIES TRAVELING THROUGH A GASEOUS MEDIUM: DYNAMICAL DRAG FORCES AND INTERNAL TORQUES [PDF]

The Astrophysical Journal, 2014
Using time-dependent linear theory, we investigate the morphology of the gravitational wake induced by a binary, whose center of mass moves at velocity Vcm against a uniform background of gas. For simplicity, we assume that the binary's components are on circular orbits about their common center of mass.
F. J. Sánchez-Salcedo, Raul O. Chametla
openaire   +2 more sources

Fold Walker: An Origami‐Inspired Quadruped Robot for Multipattern Locomotion and Object Grasping

Advanced Robotics Research, EarlyView.
This article presents Fold Walker, an origami‐inspired quadruped robot capable of multipattern locomotion and object grasping. With each leg featuring two rotational folds, the robot can transform from a flat 2D configuration into complex 3D poses. Furthermore, its trunk and legs can be one‐shot 3D printed as a unified structure, greatly simplifying ...
Yilun Sun
wiley   +1 more source

Unzipping Dynamics of Long DNAs

, 2002
The two strands of the DNA double helix can be `unzipped' by application of 15 pN force. We analyze the dynamics of unzipping and rezipping, for the case where the molecule ends are separated and re-approached at constant velocity.
A. Sarkar, C. Bustamante, C. Levinthal, D.K. Lubensky, D.K. Lubensky, J. Liphardt, J. Santa Lucia, J.F. Marko, J.F. Marko, J.F. Marko, J.L. Viovy, John F. Marko, K.J. Breslauer, K.L. Sebastian, M. Rief, M. Wang, M. Zuker, P. Nelson, P. Thomen, R.E. Thompson, Rémi Monasson, S. Cocco, S. Cocco, S. Cocco, S.B. Smith, S.M. Bhattacharjee, Simona Cocco, T. Strick, U. Bockelmann, U. Bockelmann, U. Bockelmann, U. Bockelmann, U. Gerland   +32 more
core   +1 more source

Improvement of Torque-and-Drag Modeling in Long-Reach Wells

Modern Applied Science, 2011
Torque and drag modeling is regarded as an invaluable process to assist in well planning and to predict and prevent drilling problems. It discusses how to use torque and drag calculations and measurements to plan long-reach well profiles, to execute drilling operations that minimize torque and drag effects and to monitor hole cleaning.
Seyed Ahmad Mirhaj, Eirik Kaarstad, Bernt Sigve Aadnoy   +2 more
openaire   +2 more sources

Viscous Dynamics of Lyme Disease and Syphilis Spirochetes Reveal Flagellar Torque and Drag [PDF]

Biophysical Journal, 2013
The spirochetes that cause Lyme disease (Borrelia burgdorferi) and syphilis (Treponema pallidum) swim through viscous fluids, such as blood and interstitial fluid, by undulating their bodies as traveling, planar waves. These undulations are driven by rotation of the flagella within the periplasmic space, the narrow (∼20-40 nm in width) compartment ...
Harman, Michael, Vig, Dhruv K., Radolf, Justin D., Wolgemuth, Charles W.   +3 more
openaire   +2 more sources

Magnetic Field Driven Microrobot Based on Hydrogels

Advanced Robotics Research, EarlyView.
Hydrogel‐based magnetic microrobots synergize remote magnetic control with the biocompatibility of flexible hydrogels, emerging as promising tools for minimally invasive biomedicine. This enables remotely controllable, untethered navigation within complex biological microenvironments.
Juncai Song, Yubing Guo
wiley   +1 more source

Study on the Drag Torque Characteristic of Underground Unmanned Vehicle Wet Brake System

Jixie chuandong, 2015
In view of the problem of the braking effectiveness obvious fluctuation,poor system stability of traditional underground transport vehicle,the wet brake is introduced to the traditional underground unmanned vehicle braking system,the calculation and ...
Zhou Lihong
doaj  

Multimodal Locomotion in Insect‐Inspired Microrobots: A Review of Strategies for Aerial, Surface, Aquatic, and Interfacial Motion

Advanced Robotics Research, EarlyView.
This review identifies key design considerations for insect‐inspired microrobots capable of multimodal locomotion. To draw inspiration, biological and robotic strategies for moving in air, on water surfaces, and underwater are examined, along with approaches for crossing the air–water interface.
Mija Jovchevska, Kaushik Jayaram, Nicole Xu   +2 more
wiley   +1 more source

Drill String Drag and Torque Test Device Design

Shiyou jixie, 2019
The existing drag and torque theoretical model has many assumptions, leading to a large difference between the calculated value and the true value, which seriously restricts the study of the mechanical behavior of the drill string and the optimization of
吴泽兵, 吕澜涛, 郭龙龙, 王文娟, 张帅   +4 more
doaj  

Assessment on drag force distribution of a semi-submersible truss fish cage in currents

Frontiers in Marine Science
Assessing the current forces exerted on a semi-submersible truss fish cage is crucial for understanding drag force distribution and ensuring the structural safety.
Hang-Fei Liu, Xiaohua Huang, Guoliang Pang, Gen Li, Taiping Yuan, Yu Hu, Qiyou Tao, Qiyou Tao   +7 more
doaj   +1 more source