Results 101 to 110 of about 2,447 (252)

Test on Bending Fatigue Damage of Full-size Drill String

Shiyou jixie, 2017
In the past, the study on the fatigue damage of drill string was mostly modeling or small-scale test, which could not accurately represent the fatigue damage of full-bore drill string.Based on the four-point bending fatigue test, taking the full-size ...
Cheng Caixia, Fan Jianchun, Hu Zhibin, Gao Weijun, Wu Jiafeng, Liu Shujie, He Yingming   +6 more
doaj  

Numerical Investigation of the Nonlinear Drill String Dynamics Under Stick–Slip Vibration

Vibration
This paper presents a comprehensive analysis of the influence of rotary table velocity, weight-on-bit, and viscous damping on the drill string stick–slip vibration.
Mohammad Javad Moharrami, Hodjat Shiri, Clóvis de Arruda Martins   +2 more
doaj   +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

Effect of Bit Type on Reactive Torque and Consequent Tool-face-control Anomalies

Shiyou jixie, 2017
In sliding drilling with bend house mud motor, given the same WOB, the reactive torque is greater and the directional drilling is more difficult if the drill bit is more aggressive.
Xu Lihui
doaj  

Tactile Perception of 3D‐Printed Typodont Materials in Dental Education: A Systematic Review

European Journal of Dental Education, EarlyView.
ABSTRACT Background Adoption of additive manufacture of printed typodonts within dentistry for education occurs despite inadequate reproduction of desirable tactile characteristics of human tooth tissues. Variable findings regarding material properties and educational outcomes of 3D‐printed typodonts are reported.
Alice M. G. Cheadle, Reece Bushell, William M. Palin, Phillip L. Tomson, Zehra Yonel, Mohammed A. Hadis   +5 more
wiley   +1 more source

Acoustical properties of drill strings

The Journal of the Acoustical Society of America, 1989
The recovery of petrochemical and geothermal resources requires extensive drilling of wells to increasingly greater depths. Real-time collection and telemetry of data about the drilling process while it occurs thousands of feet below the surface is an effective way of improving the efficiency of drilling operations.
openaire   +2 more sources

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

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

Localization of Hazardous Areas during Rig Operations Based on an Improved YOLOv8 Model

Shiyou jixie
Due to multiple factors such as the complex and changing environment， uneven light conditions， and diverse drill-string shapes at rig sites， existing drill-string status recognition methods are insufficient in accuracy.
Hu Jinqiu, Xu Zihan, Chu Shengli, Ma Mingjun   +3 more
doaj  

Prospective Clinical Evaluation of a Novel Repositionable Plastic Stent for Endosonography‐Guided Hepaticogastrostomy With or Without Antegrade Stenting (With Videos)

Journal of Gastroenterology and Hepatology, EarlyView.
ABSTRACT Background and study aims A repositionable plastic stent (PS), developed to overcome the limitations of conventional pusher‐type PS in endosonography‐guided hepaticogastrostomy (EUS‐HGS), minimizes the gap between the inner sheath and stent to improve insertability.
Shuntaro Mukai, Atsushi Sofuni, Takayoshi Tsuchiya, Reina Tanaka, Ryosuke Tonozuka, Yukitoshi Matsunami, Kazumasa Nagai, Hiroyuki Kojima, Hirohito Minami, Noriyuki Hirakawa, Kyoko Asano, Kento Shionoya, Takao Itoi   +12 more
wiley   +1 more source