Results 81 to 90 of about 22,977 (217)

Nonlinear Dynamics and Stick-Slip Suppression in a Drill String System Under Harmonic Excitation

Processes
Axial harmonic excitation is an emerging method for enhancing drilling speed, yet its influence on the torsional dynamics of a drill string remains unclear.
Siqi Li, Zhuo Chen, Yingcao Zhou, Mingyu Qin, Ye Yuan, Zihao Guan   +5 more
semanticscholar   +1 more source

Involvement in daily life activities from the perspectives of children and young people with childhood‐onset disabilities: A scoping review

Developmental Medicine &Child Neurology, EarlyView.
This scoping review aimed to understand the construct ‘involvement’ in daily life activities from the perspective of children and young people with childhood‐onset disabilities. We identified six conceptual ideas, including a continuum of inner dedication or investment in‐the‐moment, and five others reflecting how children and young people process ...
Vera C Kaelin, Kinga Quaaden, Helena Lindgren, Mats Granlund, Christine Imms   +4 more
wiley   +1 more source

Pre‐Task Explicit Instruction, Input Modality, and Working Memory in L2 Oral Self‐Repair

International Journal of Applied Linguistics, EarlyView.
ABSTRACT Despite the central role of tasks in language education and ensuing research documenting how task‐related variables might affect language performance and learning, it remains unclear whether pre‐task explicit instruction, input modality, and working memory (WM) influence how learners monitor and repair grammatical structures in real‐time ...
Reza Yadollahpour, Mostafa Pourhaji, Michael Sadeghi   +2 more
wiley   +1 more source

Backstepping adaptive sliding mode control based on a time-varying barrier function for the suppressing stick-slip vibrations

Open Engineering
Torsional vibrations in lumped drill strings pose a significant challenge in oil and natural gas exploration drilling, often leading to detrimental phenomena such as stick-slip.
Tuama Dina Hameed, Al-Samarraie Shibly Ahmed, Mohd Ghazali Mohamad Hazwan, Rahiman Wan   +3 more
doaj   +1 more source

Numerical Simulation of Drill-String Dynamics with an Initial Curvature

, 2015
This work is devoted to modeling of nonlinear dynamics of the rotating drill-string taking into account initial curvature and finiteness of deformations. The drill-string is compressed by variable axial force. The case of flat bending of the drill-string
A. Sergaliyev, Aliya Umbetkulova
semanticscholar   +1 more source

Climate change impacts on fish in the Baltic Sea

Journal of Fish Biology, EarlyView.
Abstract The Baltic Sea is a marginal sea with strong abiotic gradients harbouring fish of both marine and freshwater origin. Here we review the empirical evidence for how changes in climate variables have impacted different fish and fish communities in the Baltic Sea.
Örjan Östman, Meri Kallasvuo, Sanna Kuningas, Antti Lappalainen, Noora Mustamäki, Rahmat Naddafi, Lauri Saks, Jens Olsson   +7 more
wiley   +1 more source

Cell‐based crop phenotyping for future climates

New Phytologist, EarlyView.
Flow‐chart diagram illustrating the proposed pathway for improving the throughput of fluorescence imaging‐based phenotyping by using robotics and machine learning (ML) approaches. Summary Abiotic stress tolerance has been significantly weakened in modern crops during the domestication process.
Sergey Shabala, Ping Yun, Zhong‐Hua Chen, Meixue Zhou, Min Yu, Nadia Bazihizina   +5 more
wiley   +1 more source

Axial-torsional nonlinear vibration of bottom hole assembly in the air drilling technology

Petroleum
The safety and efficiency of drilling engineering are greatly impeded by destructive vibrations of drill string in air drilling, such as stick-slip, bit-bounce and their coupled vibrations. To avoid or suppress these vibrations improving the stability of
Shujie Ding, Pan Fang, Gao Li, Junan Lu, Yanmin Wang, Yang Li, Yutian Han, Dong Xiao   +7 more
doaj   +1 more source

Arthroscopic Primary Repair and Suture Augmentation for Combined Acute Femoral and Tibial Attachment Avulsion of Anterior Cruciate Ligament

Orthopaedic Surgery, EarlyView.
A rare case of dual‐end ACL avulsion is treated with an arthroscopic repair technique combining suture loops and augmentation. This approach preserves the native ligament, restores biomechanical stability, and offers a viable alternative to reconstruction in select ACL injuries.
Quanchao Li, Yujia Li, Yuchen He, Weihong Zhu   +3 more
wiley   +1 more source

Dynamics modeling and analysis of a down-hole drill string multibody system based on the absolute coordinate formulation

Journal of Physics: Conference Series
Drilling system dynamics is the basis of studying the interaction between components in drilling process, which needs to solve many difficult problems such as geometric nonlinear dynamics of drill string, contact between drill string and wellbore ...
Chao Fang, Haiquan Li, Wei Liu, Zhaohui Xu, Maolin Liao, Jinchao Fan, Zili Lin, Haibo Pang   +7 more
semanticscholar   +1 more source