Results 101 to 110 of about 364,563 (296)

Radar Method for Obtaining Information from a Horizontal Directional Drilling Device

Известия высших учебных заведений России: Радиоэлектроника
Introduction. Directional drilling is a conventional method for trenchless installation of underground communications, exploration of solid minerals, and geological exploration.
A. V. Vagin, A. S. Vorotyntseva
doaj   +1 more source

Transparent Topological Meta‐Diplexer via Tightly Confined Valley Surface States

Advanced Science, EarlyView.
An optically transparent topological metasurface supporting tightly confined valley surface states enables robust and flexible wave routing in an ultrathin platform. A compact transparent meta‐diplexer with spatially and spectrally separated channels is realized, while communication experiments verify high‐fidelity signal transmission, opening new ...
Sijie Li, Ping Li, Zhihao Lan, Yin Li, Hang Wong, Menglin L.N. Chen   +5 more
wiley   +1 more source

Key techniques and application of the ZDY15000LDK high-power automatic directional drilling rig

Meitian dizhi yu kantan
Objective For deep mining of coal mines, conventional directional drilling rigs face challenges including high labor intensity, limited control accuracy, a low intelligence level, and failure to meet the demand for efficient gas drainage. Meanwhile, high-
Quanxin LI, Gang ZHANG, Peng FANG, Wang XING, Ke YAO, Rui ZHANG, Boyang ZHANG, Xuefeng ZHAO, Yang SHI, Hanyu SUN, Qian JIA   +10 more
doaj   +1 more source

The Detection Method of Fire Abnormal Based on Directional Drilling in Complex Conditions of Mine

E3S Web of Conferences, 2018
In the light of more and more urgent hidden fire abnormal detection problem in complex conditions of mine, a method which is used directional drilling technology is put forward.
Huijun Duan, Shijun Hao, Jie Feng
doaj   +1 more source

Rainfall Shapes the Diversity of Soil Nitrogen‐Fixing Microorganisms Worldwide

Advanced Science, EarlyView.
This study reveals the distinctive pattern and mechanism of rainfall driving the global biodiversity and biogeography of soil potential N‐fixing microorganisms, and constructs the theoretical framework. The results guide us on how to maintain ecosystem productivity under future climate changes (e.g., whether a specific region needs more N fertilizers ...
Bin Hua, Shuang Pang, Ang Li, Zonghao Hu, Honghui Wu, Shuhan Zhang, Yi Fan, Yi Wu, Wei Yang, Yachao Zhao, Yupeng Guan, Baoming Ji, Deliang Kong, Yong Zhao, Anton A. Goncharov, Anastasia Yu. Korotkevich, Rong Mao, Yang Zhang, Ximei Zhang   +18 more
wiley   +1 more source

Proceedings of the Integrated Ocean Drilling Program 302: Arctic Coring Expedition (ACEX)

, 2006
<p>The first scientific drilling expedition to the central Arctic Ocean, Integrated Ocean Drilling Program Expedition 302, Arctic Coring Expedition (ACEX), recovered sediment cores to 428 m below seafloor (mbsf) in water depths of ~1300 m, 250 km ...
Onodera, Jonaotaro, Rio, Domenico, Yamamoto, Masanobu, Jakobsson, Martin, McInroy, David, Koç, Nalân, Suto, Itsuki, O'Regan, Matthew, Clemens, Steven C., Gattacceca, Jérôme, Kaminski, Michael A., Pälike, Heiko, Cronin, Thomas, Suzuki, Noritoshi, Moore, Jr., Theodore C., King, John, Stein, Ruediger, Sakamoto, Tatsuhiko, Eynaud, Frédérique, Rea, Brice, Brinkhuis, Henk, Martinez, Nahysa E., St. John, Kristen, Smith, David C., Watanabe, Mahito, Moran, Kate, Backman, Jan, Jordan, Richard W., Matthiessen, Jens, Dickens, Gerald R., Takahashi, Kozo   +30 more
core   +1 more source

Additive Manufacturing of High‐Performance Polymers for Extreme Environments

Advanced Science, EarlyView.
Additive manufacturing of high‐performance polymers for extreme environments is critically reviewed through an integrated chemistry‐processing‐structure‐property‐qualification framework. The review compares fused filament fabrication, selective laser sintering, and direct ink writing, linking rheology and thermal history to crystallization, defect ...
Md Tofazzal Hossain, Mohammed Intishar Nur, Md Shajedul Hoque Thakur, Indranil Dey, Md Mesbahul Maruf, Md Jahid Hasan, Suryasarathi Bose, Muhammad M. Rahman   +7 more
wiley   +1 more source

Key technologies and development trends of borehole trajectory control in China’s coal mining areas

Meitan kexue jishu
China boasts abundant coal reserves, yet complex geological conditions and significant variations in coal seam occurrence pose challenges. As mining difficulty and safety risks increase, directional drilling technology has become increasingly critical in
Dongdong YANG, Youzhen ZHANG, Quanxin LI, Long CHEN, Gang CHEN   +4 more
doaj   +1 more source

Proceedings of the Integrated Ocean Drilling Program 345: Hess Deep Plutonic Crust

, 2014
<p>Integrated Ocean Drilling Program (IODP) Hess Deep Expedition 345 was designed to sample lower crustal primitive gabbroic rock that formed at the fast-spreading East Pacific Rise (EPR) in order to test competing models of magmatic accretion and ...
Machi, Sumiaki, McCaig, Andrew, de Brito Adriao, Alden, Maeda, Jinichiro, Harigane, Yumiko, Akizawa, Norikatsu, Abe, Natsue, Saha, Abhishek, Falloon, Trevor, Python, Marie, Nozaka, Toshio, Gillis, Kathryn M., Jean, Marlon M., Marks, Naomi E., Wintsch, Robert P., Ildefonse, Benoit, Koepke, Juergen H., Faak, Kathrin, Godard, Marguerite, Cheadle, Michael J., Hoshide, Takashi, Morris, Antony, Friedman, Sarah, Horst, Andrew J., Snow, Jonathan, Klaus, Adam, Meyer, Romain, Guèrin, Gilles, Ceuleneer, Georges, John, Barbara   +29 more
core   +1 more source

A Magnetic‐Driven Self‐Rotation‐Stabilized Miniature Swimming Robot

Advanced Science, EarlyView.
Inspired by the stable rotational descent of seeds in nature, this study designs a magnetic‐driven self‐rotation‐stabilized miniature swimming robot (MSMSR). Based on a resonance‐driven strategy, the robot exhibits high swimming performance, offering enhanced directional swimming and improved resistance to water flow disturbances compared to existing ...
Fujun Wang, Chuhan Zhang, Hao Zhang, Yanling Tian, Cunman Liang   +4 more
wiley   +1 more source