Results 41 to 50 of about 9,918,357 (236)

Key techniques and application of the ZDY15000LDK high-power automatic directional drilling rig

Meitian dizhi yu kantan
Objective For deep mining of coal mines, conventional directional drilling rigs face challenges including high labor intensity, limited control accuracy, a low intelligence level, and failure to meet the demand for efficient gas drainage. Meanwhile, high-
Quanxin LI, Gang ZHANG, Peng FANG, Wang XING, Ke YAO, Rui ZHANG, Boyang ZHANG, Xuefeng ZHAO, Yang SHI, Hanyu SUN, Qian JIA   +10 more
doaj   +1 more source

Impact of Initial Treatment Setting on Survival in Relapsed Pediatric and AYA Bone Sarcomas: A Secondary Analysis of a Prospective Clinical Trial

Pediatric Blood &Cancer, EarlyView.
ABSTRACT Background Outcomes in relapsed or refractory pediatric and AYA bone sarcomas remain poor, and the impact of early referral to specialized sarcoma centers on survival is unclear. Early centralization of care may improve local and systemic treatment quality, but evidence in this population is limited.
Justyna Antoniuk‐Majchrzak, Katarzyna Bilska, Tomasz Koziński, Jadwiga Węcławek‐Tompol, Dorota Sega‐Pondel, Radosław Chaber, Wanda Badowska, Katarzyna Rosłan, Hanna Koseła‐Paterczyk, Anna Raciborska   +9 more
wiley   +1 more source

Reactionless control of free‐floating space manipulators with parameter uncertainty and input disturbance

IET Control Theory & Applications
This paper studies the control problem of free‐floating space manipulators, and a control scheme is proposed to solve reactionless control of the end‐effector pose tracking with parameter uncertainty and input disturbance.
Kai Gong, Yingmin Jia, Yuxin Jia
doaj   +1 more source

Factors influencing the build-up rate of small-diameter rotary steerable systems in underground coal mines

Meitian dizhi yu kantan
ObjectiveIntelligent drilling represents an important part of intelligent coal mine construction. However, measurement-while-drilling (MWD) directional drilling, the core of underground intelligent drilling operations, currently suffers from several ...
Dongdong YANG, Quanxin LI, Youzhen ZHANG, Long CHEN, Zhiwei CHU, Bici JIANG, Bo WANG, Wenchao YAN   +7 more
doaj   +1 more source

Organizing the interface—Plasma membrane architecture and receptor dynamics in virus‐cell interactions

FEBS Letters, EarlyView.
Plasma membranes contain dynamic nanoscale domains that organize lipids and receptors. Because viruses operate at similar scales, this architecture shapes early infection steps, including attachment, receptor engagement, and entry. Using influenza A virus and HIV‐1 as examples, we highlight how receptor nanoclusters, multivalent glycan interactions ...
Jan Schlegel, Christian Sieben
wiley   +1 more source

Skip Re-Entry Trajectory Detection and Guidance for Maneuvering Vehicles

Sensors, 2020
The re-entry trajectory of maneuvering vehicles with medium to high hypersonic lift-to-drag ratios is generally planned using quasi-equilibrium flight conditions known from Space Shuttles.
Hongqiang Sun, Shuguang Zhang
doaj   +1 more source

Residual tail twisting in ascidian larvae is stabilized by asymmetric myofibrils that resist bilateral symmetry restoration

FEBS Letters, EarlyView.
Ascidian Ciona larvae initially show strong clockwise tail twisting, which is largely corrected during development. However, a small residual twist remains. This study shows that organized helical myofibrils in tail muscles mechanically stabilize this residual asymmetry, preventing complete restoration of bilateral symmetry and revealing how embryos ...
Yuki S. Kogure, Misaki K. Nishio, Satoru Okuda, Kohji Hotta   +3 more
wiley   +1 more source

Formation control of nonholonomic mobile robots: the virtual structure approach [PDF]

, 2012
PhDIn recent years, there has been a considerable growth in applications of multi-robot systems as opposed to single-robot systems. This thesis presents our proposed solutions to a formation control problem in which mobile robots are required to ...
Sadowska, Anna Danuta
core   +4 more sources

Winch Traction Dynamics for a Carrier-Based Aircraft Under Trajectory Control on a Small Deck in Complex Sea Conditions

Aerospace
When the winch traction system of a carrier-based aircraft works under complex sea conditions, the rope and the tire forces are greatly changed compared with under simple sea conditions, and it poses a potential threat to the safety and stability of the ...
Guofang Nan, Sirui Yang, Yao Li, Yihui Zhou   +3 more
doaj   +1 more source

Application of Active Magnetic Ranging Technology in Capping Operation of Well T1

Shiyou jixie, 2022
The active magnetic ranging technology is mainly used to solve the problem of effective connection between relief well and failure well, and there is no corresponding equipment in China.
Che Yang, Qiao Lei, Yuan Guangjie, Lin Shengjie, Zheng Lei, Du Weiqiang, Liu Tianen   +6 more
doaj