Results 131 to 140 of about 6,935 (243)

Design Method of Adaptive Drilling Stick-Slip Vibration Downhole Control Tool

Shiyou jixie
There are few reports on the design method for downhole stick-slip vibration adaptive prevention and control tool， and the key parameter design models and methods are not yet perfect.
Zhou Bo, Li Bing, Wang Lincong, Zhang Fucheng, Yu Jing, Si Boyu   +5 more
doaj   +1 more source

Nonlinear Dynamics of a Rotary Drill-String Immersed in a 3D Geometry Well

, 2018
10th International Conference on Rotor Dynamics, Rio de Janeiro, BRAZIL, SEP 23-27, 2018International audienceOil or geothermic rotary drilling is composed with a very slenderness drill-string which is subjected in particular to the tool-bit excitations.
Regis Dufour, Tran, Quang Thinh, Lionel Manin, K.-L. Nguyen, Menand, Stéphane, Andrianoely, Marie-Ange, M.-A. Andrianoely, Dufour, Régis, Nguyen, Khac-Long, Q.-T. Tran, Stephane Menand, Baguet, Sébastien, Sebastien Baguet, Manin, Lionel   +13 more
core   +1 more source

Methods to estimate marine functional connectivity: A primer

Ecological Applications, Volume 36, Issue 4, June 2026.
Abstract Organism movement is a key process in the transfer of individuals, genes, functional traits, matter, and energy among habitat patches, at sea and across the land–sea interface. The resulting fluxes, collectively termed marine functional connectivity (MFC), underpin planetary health and an array of ecosystem services.
Anna M. Sturrock, Susanne E. Tanner, Sophie Arnaud‐Haond, Jacopo Aguzzi, Francisco R. Barboza, Maria Beger, Andreu Blanco, Deirdre Brophy, Marta Carreton, Amber‐Robyn Childs, Federica Costantini, Oscar E. Gaggiotti, Bronwyn M. Gillanders, José M. González‐Irusta, Katell Guizien, Tamar Guy‐Haim, Stefanie Haase, Ewan Hunter, Jonne Kotta, Geneviève Lacroix, Rafet Ç. Öztürk, Angel Pérez‐Ruzafa, Patrick Reis‐Santos, Cynthia Riginos, Gil Rilov, Buki Rinkevich, Guiomar Rotllant, David H. Secor, Szymon Smoliński, Clive N. Trueman, Benjamin D. Walther, Audrey M. Darnaude   +31 more
wiley   +1 more source

MiR‐30a‐5p mediates epileptogenesis in epilepsy models by targeting SOX4 to regulate the Wnt/β‐catenin pathway

Epilepsia Open, Volume 11, Issue 3, Page 983-1002, June 2026.
Abstract Objective The pathogenesis of epilepsy is closely associated with neuronal synaptic plasticity. MicroRNAs (miRNAs) can regulate various biological processes by binding to specific sequences on target genes. This study employs bioinformatics, molecular dynamics, and experimental approaches to investigate the mechanism by which MiR‐30a‐5p treats
Zhenlin Yang, Xu Zhang, Jingjing Guo, Yuanxin Wei, Jinzi Li   +4 more
wiley   +1 more source

A review on condition monitoring and control of industrial drilling systems: fault detection, fuzzy control, and human-induced faults

Frontiers in Mechanical Engineering
This review presents a structured synthesis of recent advances in condition monitoring, fault diagnosis, and control of industrial drilling systems, with emphasis on rotary and rotary-percussive drilling.
Satyam Paul, Magnus Löfstrand
doaj   +1 more source

“We Have Come to Offer Something Which (They) Were Not Even Looking for”: U.S. Christian Conservative Evangelical Faith Missions in the Ecuadorian Upper Amazon

The Journal of American Culture, EarlyView.
Diego Mauricio Cortés
wiley   +1 more source

Failure mechanism analysis of the threaded connections of the stabilizer in bottom hole assemblies equipped with a positive displacement motor and a rotary steerable system

Advances in Mechanical Engineering
Drilling practices in Tarim Oilfield of China have shown that the combined use of a Positive Displacement Motor (PDM) and a Power Drive System can significantly enhance wellbore trajectory control and drilling efficiency, but it is likely to cause drill ...
Qinfeng Di, Heyuan Yang, Dakun Luo, Liang Wen, Tiansheng Deng, Wenchang Wang, He Zhang   +6 more
doaj   +1 more source

Stability Analysis of the Rotary Drill-String

, 2014
Oil and natural gas are major energy sources for modern society. A rotary drilling system is the best known technology to extract them from underground.
Pan, Liangming
core  

Investigation of the influence of cuttings transport on drill string dynamics

From industrial applications, it is known that drill-string vibrations can cause severe damage to underground equipment. Since especially lateral drill-string vibrations are difficult to avoid, it is important to study the factors influencing their damping.
openaire   +2 more sources

Low Heat Flow Near the Deformation Front of the Northern Hikurangi Margin Revealed by Deep Borehole Observatories

Geochemistry, Geophysics, Geosystems, Volume 27, Issue 6, June 2026.
Abstract Deep borehole observatories installed during IODP Expedition 375 at Sites U1518 and U1519 along the northern Hikurangi subduction margin offshore New Zealand provide new constraints on the thermal structure of the frontal prism, where frequent shallow slow slip events occur.
P. M. Fulton, M. Fresonke
wiley   +1 more source