Results 121 to 130 of about 3,418,514 (199)

Experimental investigation and analysis of frictional resistance between drill pipe and cuttings bed in horizontal wells

Journal of Engineering and Applied Science
Extended-reach horizontal wells are critical for unconventional hydrocarbon development, yet cuttings accumulation frequently induces excessive drag, pipe sticking, and drilling instability.
Xiaofeng Sun, Xiaochen Jing, Shujie Liu, Yingcao Zhou, Yudong Tian, Di Yao, Jingyu Qu, Qiaobo Hu, Liang Tao, Ming Xu   +9 more
doaj   +1 more source

Internal Structure, Kinematics, and Prehistory of Frozen Debris Lobe‐A (FDL‐A), Brooks Range, Alaska

Permafrost and Periglacial Processes, Volume 37, Issue 4, Page 645-667, October/December 2026.
ABSTRACT Frozen Debris Lobe‐A (FDL‐A)—one of hundreds of FDLs in the Brooks Range of northern Alaska—is a slow‐moving landslide in permafrost that has been the subject of research since 2008 due to its close proximity to the Dalton Highway. Here, we synthesize more than a decade's worth of climate and surface measurements of monitored FDLs, and the ...
Margaret M. Darrow, Esther L. Babcock, Ben A. Leshchinsky   +2 more
wiley   +1 more source

T-duality invariant approaches to string theory [PDF]

, 2010
PhDThis thesis investigates the quantum properties of T-duality invariant formalisms of String Theory. We introduce and review duality invariant formalisms of String Theory including the Doubled Formalism.
Thompson, Daniel C.
core  

Research and Application of Optimal Placement of Hydraulic Oscillator

Shiyou jixie, 2016
Sliding drilling in complex well often encounters serious weight stacking,resulting in inadequate WOB and low ROP.Hydraulic oscillator introduces an axial oscillating motion on the drilling string by axial vibration,so to transfer the static friction ...
Zhang Kang, Feng Qiang, Wang Jianlong, Zhang Ruguang, Yu Zhiqiang, Xia Heming   +5 more
doaj  

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

Syzygy: The Concord String Quartet

, 2008
String Quartet No. 4 (1978), George Rochberg (b. 1918) -- String Quartet No. 3 (1981), Jacob Druckman (b. 1928) -- String Quartet No.

core  

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

Developmental Medicine &Child Neurology, Volume 68, Issue 10, Page 1351-1364, October 2026.
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

Integrating Acoustic Telemetry and Stable Isotope Data Reveals Overlap in Resource Use by Large‐Bodied Fishes in a Temperate Lake

Ecology of Freshwater Fish, Volume 35, Issue 4, October 2026.
ABSTRACT Temperate lake ecosystems undergo seasonal shifts that disproportionately alter the availability of suitable habitat for fishes of different thermal guilds. While many studies have investigated fish habitat use patterns, few have estimated the degree to which fish species overlap in space across seasons from a three‐dimensional perspective ...
Ian A. Richter, Alyssa M. Andersen, Karen E. Smokorowski, Paul J. Blanchfield   +3 more
wiley   +1 more source

Cell‐based crop phenotyping for future climates

New Phytologist, Volume 252, Issue 2, Page 575-587, October 2026.
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

Development of fully coupled deviated well drill string dynamics simulation model for fatigue and vibration analysis. [PDF]

Simulation
Liyanarachchi S, Rideout G.
europepmc   +1 more source