Results 41 to 50 of about 972,039 (207)

Experimental Study on Axial Impact Mitigating Stick-Slip Vibration with a PDC Bit

Shock and Vibration, 2021
Stick-slip vibration reduces the drilling rate of penetration, causes early wear of bits, and threatens the safety of downhole tools. Therefore, it is necessary to study suppression methods of stick-slip vibration to achieve efficient and safe drilling ...
Yong Wang, Hong-Jian Ni, Yi-Liu Tu, Rui-He Wang, Xue-ying Wang, Heng Zhang, Jiaxue Lyu, Hongqiao Xie   +7 more
semanticscholar   +1 more source

Polymer‐Based Probabilistic Bits for Thermodynamic Computing

Advanced Physics Research, EarlyView.
Electropolymerized conjugated polymers function as intrinsic entropy sources for probabilistic computing. Thermally driven conformational fluctuations of pendant triphenylamine groups produce stochastic resistance dynamics that are transduced into voltage‐gated probabilistic bits following logistic transfer functions identical to those of stochastic ...
Stephen H. Foulger, Yuriy Bandera, Igor Luzinov, Travis Wanless, Lubomir Kostal, Vojtech Nádaždy, Petr Janovský, Jarmila Vilčáková   +7 more
wiley   +1 more source

Cutter Load Distribution Analysis and Crown Shape Optimal Design of Complex Curved PDC Bit [PDF]

, 2019
When drilling in hard rock formations, the wear of the complex curved PDC bit is extremely uneven. To solve this problem, a numerical simulation method was used to analyze the load distribution law of the cutters and the crown shape of the complex curved
Pei, J. (Ju), Pei, Ju
core   +1 more source

Human Monocytic Models Reveal Genotype‐Dependent Inflammatory Programs in VEXAS Syndrome

Arthritis &Rheumatology, EarlyView.
Objective VEXAS syndrome is a severe X‐linked autoinflammatory disorder caused by somatic mutations in ubiquitin‐like modifier activating enzyme 1 (UBA1), with clinical outcomes that vary by UBA1 genotype. We aimed to elucidate genotype‐specific inflammatory programs and identify potential therapeutic targets.
Kana Higashitani, Tatsuma Ban, Yohei Kirino, Go R. Sato, Soichiro Adachi, Yuki Iizuka, Kayo Harita, Ayaka Maeda, Osamu Ohara, Hideaki Nakajima, Tomohiko Tamura   +10 more
wiley   +1 more source

Experimental Study on Granite Broken by PDC Bit under High Temperature and High Pressure

Shiyou jixie, 2021
As the exploration and development of oil and gas gradually advance to the deep layer, the formation temperature and pressure keep increasing. The efficiency of PDC bit breaking deep hard rock under high temperature and high pressure is reduced, and the ...
Shi Huaizhong, Fu Xinkang, Chen Zhenliang, He Wenhao, Xiong Chao, Gao Fei   +5 more
doaj  

The impact of pharmacogenetic‐informed care on medication adherence and psychological factors associated with adherence: A narrative review

British Journal of Clinical Pharmacology, EarlyView.
Improvement in medication adherence is often proposed as a potential advantage of pharmacogenetic‐guided prescribing over a traditional one‐size‐fits‐all approach. This paper provides a review of the published literature and presents the findings of studies that measure adherence to medication as an outcome of pharmacogenetic‐informed care, or that ...
Lucy Galloway, Alison Wright, John Weinman   +2 more
wiley   +1 more source

Innovative PDC Cutter with Elongated Ridge Combines Shear and Crush Action to Improve PDC Bit Performance

, 2017
Most traditional polycrystalline diamond compact (PDC) cutting elements have a flat polycrystalline diamond table at the end of cylindrically shaped tungsten carbide body.
Bradley Krough, Charles Douglas, Jordan Self, Levi Mueller, Youhe Zhang, Xiaoge Gan, Zhijun Lin, Greg Skoff, Huimin Song, Davon Crane   +9 more
core   +1 more source

Analysis of Torsional Vibration Characteristics of PDC Bit and Design of the Damping Tool

Shiyou jixie, 2017
In order to suppress the torsional vibration of the PDC bit, the torsion model of PDC bit was established.The force on the PDC cutter during rock breaking was analyzed to attain the relationship between WOB and torque.
Zha Chunqing, Liu Gonghui, Li Jun, Xi Yan, Zhang Tao   +4 more
doaj  

Experimental study on rock-breaking mechanism of micro-coring PDC bit

Journal of Petroleum Exploration and Production Technology, 2021
In this paper, in order to study the rock-breaking mechanism of the micro-coring PDC bit, a series of unit breaking experiments containing 2 breaking forms (static-pressure breaking and fracture breaking) are conducted on core columns of sandstone ...
Sheng-gen Huang, Qing-Chun Gao, X. Ye, Yingxin Yang, Kuilin Huang   +4 more
semanticscholar   +1 more source

A Code‐Invariant QSG–VGA Co‐Design Methodology for Compact CMOS Vector‐Sum Phase Shifters

International Journal of Circuit Theory and Applications, EarlyView.
A circuit‐level co‐design methodology for compact vector‐sum phase shifters is presented, combining a code‐invariant common‐gate variable‐gain amplifier (VGA) with a resistorless quadrature signal generator (QSG). By maintaining an almost constant input resistance, explicit resistors are eliminated from the QSG.
Uxua Esteban Eraso, Carlos Sánchez‐Azqueta, Francisco Aznar, Concepción Aldea, Santiago Celma   +4 more
wiley   +1 more source