Results 41 to 50 of about 364,563 (296)

Theoretical analysis and design of hydro-hammer with a jet actuator: An engineering application to improve the penetration rate of directional well drilling in hard rock formations. [PDF]

PLoS ONE, 2018
Rapid horizontal directional well drilling in hard or fractured formations requires efficient drilling technology. The penetration rate of conventional hard rock drilling technology in horizontal directional well excavations is relatively low, resulting ...
Jiang-Fu He, Yun-Pei Liang, Li-Jia Li, Yong-Jiang Luo   +3 more
doaj   +1 more source

Defect‐Mediated Inelastic Light Scattering by Infrared Phonons in Hexagonal Boron Nitride

Advanced Functional Materials, EarlyView.
Optically active defects in hexagonal boron nitride enable inelastic stimulated light scattering mediated by infrared‐active phonons, relaxing conventional Raman selection rules. Defect engineering enhances the Stokes‐conversion process and activates both TO‐ and LO‐phonon scattering channels.
Prabhdeep Singh, Bharti Garg, Maximilian Black, Masoud Taleb, Nahid Talebi   +4 more
wiley   +1 more source

A clean self-diverting acid for carbonate reservoir in deep wells at high temperatures and its performance evaluation

Scientific Reports
The key technology for stimulating carbonate oil and gas reservoirs lies in the meticulous selection of an appropriate acid system, control over the action distance of active acid on the reservoir, and attainment of good conductivity through non-uniform ...
Xiangsen Gao, Min Wang, Xian Shi, Bin Li, Jian Mao, Poplygin Vladimir Valerievich   +5 more
doaj   +1 more source

Research on gas pre-drainage in coal roadway strips by combined ordinary drilling and directional drilling

Gong-kuang zidonghua, 2021
When single layered ordinary drilling or directional drilling are used in gaspre-drainage in coal roadway strips, the long boreholes easily deviate from the trajectory and the cost of directional drilling is high.
JI Pengfei, GUO Ying, ZHANG Lei, KONG Xiangguo, WANG Xu, ZHOU Yuxuan   +5 more
doaj   +1 more source

Configuration‐Encoded Cell Alignment by Light‐Gated Silicon Photovoltaic Microcell Arrays

Advanced Functional Materials, EarlyView.
Light‐gated silicon photovoltaic microcells convert pulsed illumination into localized electrical cues. Arranging otherwise similar microcells into four‐lobed, six‐lobed, or circular patterns directs fibroblasts into corresponding local arrangements without wired stimulation.
Yifan Tao, Ilayda Namli, Joseph Christakiran Moses, Youdi Liu, Suihong Liu, Syed Hasan Askari Rizvi, Yasar Ozer Yilmaz, Ibrahim T. Ozbolat   +7 more
wiley   +1 more source

Research on gas drainage technology and equipment of high-level directional drilling in coal mine [PDF]

E3S Web of Conferences
The gas overrun at the upper corners of the goaf and return air lanes has been restricting the development of China's coal mining industry. To solve the problem of over-limit gas concentration at the upper corners, the fundamental reason is to reduce the
Song Yubo
doaj   +1 more source

Directional drilling [PDF]

, 2016
The purpose of the thesis was to accumulate knowledge about directional drilling in Russia, to study all regulatory documents and Russian companies which take part in the development of directional drilling in Russia.
Panov, Filipp
core  

Proceedings of the Integrated Ocean Drilling Program 344: Costa Rica Seismogenesis Project, Program A Stage 2 (CRISP-A2)

, 2013
<p>The Costa Rica Seismogenesis Project (CRISP) was designed to elucidate processes that control nucleation and seismic rupture of large earthquakes at erosional subduction zones. The CRISP study area is located offshore the Osa Peninsula where the
Burkett, Ashley, Charpentier, Delphine, Sakaguchi, Arito, Vannucchi, Paola, Screaton, Elizabeth J., Petronotis, Katerina, Malinverno, Alberto, Hashimoto, Yoshitaka, Jovane, Luigi, Kutterolf, Steffen O., Saito, Saneatsu, Harris, Robert N., Diz, Paula, Hamahashi, Mari, Choi, Jiyoung, Millan, Cristina, Yan, Quanshu, Baxter, Alan T., Solomon, Evan A., Sandoval Gutierrez, Maria Isabel, Berg, Richard D., Smith-Duque, Christopher E., Martin, Kylara, Torres, Marta E., Straub, Susanne M., Heydolph, Ken, Uchimura, Hitomi, Zhao, Xixi, Yamamoto, Yuzuru, Kastner, Miriam, Tanikawa, Wataru, Kurz, Walter, Li, Yong Xiang, Nascimento, Debora B.   +33 more
core   +1 more source

Molecular Bridges for 2D Nanomaterials

Advanced Functional Materials, EarlyView.
Molecular cross‐linking provides a versatile strategy to engineer interfaces in 2D materials. By tuning the linker backbone, binding mode, and interflake spacing, molecular bridges can regulate charge transport, mechanical integrity, chemical functionality, and processing.
Yudhajit Bhattacharjee, Kevin Synnatschke, Andreas Fery, Hendrik Schlicke   +3 more
wiley   +1 more source

Research and application of near-horizontal directional coring technology and supporting drilling tools

Meikuang Anquan
In order to solve the technical problems of accurate and fine geological exploration of mines and preliminary exploration of infrastructure projects, based on the deflection mechanism of rope coring straightening drilling trajectory, a combination of ...
Zujie ZOU
doaj   +1 more source