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Articles 365431 - 365460 of 5207234
Full-Text Articles in Entire DC Network
Geological Structures Fine Monitoring Using Seismic-While-Tunneling Technique In Wangpo Mine, Zhao Huibo, Qin Si, Chen Chao, Guan Qi, Zhao Xingwei, Che Jianhang
Geological Structures Fine Monitoring Using Seismic-While-Tunneling Technique In Wangpo Mine, Zhao Huibo, Qin Si, Chen Chao, Guan Qi, Zhao Xingwei, Che Jianhang
Coal Geology & Exploration
Traditional tunnel seismic advance detection technology is limited by the use of explosives, the need for mining stoppages, prediction speed, detection range, and capabilities, making it challenging to meet the high-precision geological structure detection requirements of intelligent tunneling faces. In response, the seismic-while-tunneling technique utilizes the vibration of the roadheader cutting the coal wall as the seismic source. This method employs real-time data upload, automatic processing, and dynamic imaging. By leveraging information technology and software support, and utilizing real-time continuous super-saturation stacking supported by massive data, the imaging precision of geological anomalies ahead of the mining face is significantly enhanced. …
Pneumatic Directional Drilling Technology And Equipment For Broken-Soft Coal Seams In Underground Coal Mines, Tian Hongliang, Zhang Jinbao, Wang Li, Fang Jun, Wang Jianqiang
Pneumatic Directional Drilling Technology And Equipment For Broken-Soft Coal Seams In Underground Coal Mines, Tian Hongliang, Zhang Jinbao, Wang Li, Fang Jun, Wang Jianqiang
Coal Geology & Exploration
[Objective] The geological conditions of coal seams in China are complex, with a wide distribution of broken-soft coal seams, and a large number of wells have the problems of high gas and coal-gas outburst. Currently, borehole gas drainage is an effective measure for preventing and controlling the gas disasters. [Methods] In response to the problems of uncontrollable drilling trajectory, shallow drilling depth, large blind spots of drainage in conventional rotary drilling process of broken-soft coal seams, as well as multiple stuck drilling accidents, great difficulty in drilling and low drilling efficiency in conventional directional drilling processes, the development history and …
Build-Up Rate Prediction Of Rotary Steerable Tools Based On Delay Differentiation, Li Fei, Zhang Nan
Build-Up Rate Prediction Of Rotary Steerable Tools Based On Delay Differentiation, Li Fei, Zhang Nan
Coal Geology & Exploration
[Objective] Accurate build-up rate prediction of rotary steerable tools is a prerequisite to achieve the precise control of tools. In order to grasp the variation law of the build-up rate of the rotary steerable bottom-hole assembly (RSBHA). [Methods] Based on the structural charaeteristics of the tool, the Euler-Bernoulli beam equation method is used to analyz the forces outing on the composite RSBHA. At the same time, the calculation method of the tool deflection angle in different sections and the bit pre-drilling deflection angle was obtained with consideration to the geometric relationship of the bottom-hole assembly, and the distance between the …
Analysis Of Three-Dimensional Nonlinear Fluid-Solid Coupling Vibration Characteristics Of Coalbed Methane Abandoned Well Plugging String, Xu Zhixin, Wan Jifang, Hong Yi, Liu Hangming, Yi Xianzhong, Diao Binbin, Wang Yanbin
Analysis Of Three-Dimensional Nonlinear Fluid-Solid Coupling Vibration Characteristics Of Coalbed Methane Abandoned Well Plugging String, Xu Zhixin, Wan Jifang, Hong Yi, Liu Hangming, Yi Xianzhong, Diao Binbin, Wang Yanbin
Coal Geology & Exploration
[Objective] The plugging quality of cement plug in abandoned coalbed methane wells is critical to preventing pollutant leakage. Current standards for handling these wells involve simple mud pump injection, which often results in cement plugs with issues like particle agglomeration, bubbles, and micropores. These defects reduce the strength of the cement plug and compromise its sealing performance. [Methods] To address this, vibration technology is applied to the plugging operation, using a specialized tool to induce vibrations in the pipe string. This process enhances the fluidity of the cement slurry via the transmission of vibration energy, thereby improving the plugging quality …
Q&A With Calyn Ashe (Bfa Graphic Design), Calyn Ashe
Q&A With Calyn Ashe (Bfa Graphic Design), Calyn Ashe
Q & A Interviews with Art Students
No abstract provided.
Q&A With Liv Wuertz (Bfa Graphic Design), Liv Wuertz
Q&A With Liv Wuertz (Bfa Graphic Design), Liv Wuertz
Q & A Interviews with Art Students
No abstract provided.
Q&A With Makenna Hobbs (Bfa Graphic Design), Makenna Hobbs
Q&A With Makenna Hobbs (Bfa Graphic Design), Makenna Hobbs
Q & A Interviews with Art Students
No abstract provided.
Q&A With Denzel Foster (Bfa Graphic Design), Denzel Foster
Q&A With Denzel Foster (Bfa Graphic Design), Denzel Foster
Q & A Interviews with Art Students
No abstract provided.
Q&A With Payton Noonan (Bfa Graphic Design), Payton Noonan
Q&A With Payton Noonan (Bfa Graphic Design), Payton Noonan
Q & A Interviews with Art Students
No abstract provided.
Q&A With Brailey Hoey (Bfa Graphic Design), Brailey Hoey
Q&A With Brailey Hoey (Bfa Graphic Design), Brailey Hoey
Q & A Interviews with Art Students
No abstract provided.
Q&A With Emily Hairie (Bfa Graphic Design), Emily Hairie
Q&A With Emily Hairie (Bfa Graphic Design), Emily Hairie
Q & A Interviews with Art Students
No abstract provided.
Spatial Distribution And Influencing Factors Of Microseismic Events In Unequal-Length Mining Faces In Coal Mines, Zhou Jinyan, Yang Hongzeng, Gao Jietao
Spatial Distribution And Influencing Factors Of Microseismic Events In Unequal-Length Mining Faces In Coal Mines, Zhou Jinyan, Yang Hongzeng, Gao Jietao
Coal Geology & Exploration
[Objective] The varying length of a mining face along its dip direction or adjusting mining significantly increases water inrush risks of the mining face. This study investigate the hazards and influencing factors brought by unequal length arrangements to the mining face is one of the key issues in deepening the research on coal mine water hazard prevention and ensuring the safe mining face. [Methods] With the No. 15240 mining face, consisting of a narrow part, a wide part, and a slope, in the Jiulong Coal Mine of the Jizhong Energy Fengfeng Group as the engineering background, a large amount of …
The Impact Of Servqual On Consumers’ Satisfaction, Loyalty, And Intention To Use Online Food Delivery Services, Denni Arli, Patrick Van Esch, Scott Weaven
The Impact Of Servqual On Consumers’ Satisfaction, Loyalty, And Intention To Use Online Food Delivery Services, Denni Arli, Patrick Van Esch, Scott Weaven
Marketing and Hospitality, Resort and Tourism Management
Over the past five years, customer visits to restaurants have stag- nated, while online deliveries have grown significantly. Many restaurants have adapted by adopting third-party food delivery services. However, online food delivery services (OFDSs) are underrepresented in the current retail literature. This study aims to address this gap by assessing the impact of service quality on consumers’ satisfaction, loyalty, and intention to use food delivery services. Specifically, we investigated whether customers were more loyal to restaurants or online food delivery services (OFDSs). We recruited 475 respondents who had used online food delivery services. This study analyzed the data using partial …
Development And Application Of A Supercritical Co2 Pulsed Fracturing-Seepage Coupling Test System, Liu Jiajia, Zhang Yunlong, Nie Zishuo, Gao Zhiyang, Xu Wensong
Development And Application Of A Supercritical Co2 Pulsed Fracturing-Seepage Coupling Test System, Liu Jiajia, Zhang Yunlong, Nie Zishuo, Gao Zhiyang, Xu Wensong
Coal Geology & Exploration
[Objective] To effectively enhance the extraction effects of coalbed methane (CBM), this study proposed a novel approach for fracturing coals (rocks) using pulsation of supercritical carbon dioxide (CO2) by combining pulsed fracturing with supercritical CO2 fracturing. [Methods] A true triaxial test system coupling supercritical CO2 pulsed fracturing with seepage was independently developed, and its primary structure, characteristics, and functions were elucidated. Then, the supercritical CO2 pulsed fracturing - seepage/acoustic emission monitoring tests under true triaxial conditions were conducted in the laboratory. The test system, controlling the triaxial stress by combining an independent servo system with …
Panel Discussion At Exhibit Opening, Thomas Graning
Panel Discussion At Exhibit Opening, Thomas Graning
The Many Lives of Andrew Young
Image from the opening reception of "The Many Lives of Andrew Young" exhibit at the J.D. Williams Library, University of Mississippi.
Exhibit Panels, Thomas Graning
Exhibit Panels, Thomas Graning
The Many Lives of Andrew Young
Image from the opening reception of "The Many Lives of Andrew Young" exhibit at the J.D. Williams Library, University of Mississippi.
Ribbon Cutting At Exhibit Opening, Thomas Graning
Ribbon Cutting At Exhibit Opening, Thomas Graning
The Many Lives of Andrew Young
Image from the opening reception of "The Many Lives of Andrew Young" exhibit at the J.D. Williams Library, University of Mississippi.
Dr. Ethel Scurlock During Panel Discussion, Thomas Graning
Dr. Ethel Scurlock During Panel Discussion, Thomas Graning
The Many Lives of Andrew Young
Image from the opening reception of "The Many Lives of Andrew Young" exhibit at the J.D. Williams Library, University of Mississippi.
Rodney Mims Cook, Jr. And Ambassador Andrew Young At Panel Discussion, Thomas Graning
Rodney Mims Cook, Jr. And Ambassador Andrew Young At Panel Discussion, Thomas Graning
The Many Lives of Andrew Young
Image from the opening reception of "The Many Lives of Andrew Young" exhibit at the J.D. Williams Library, University of Mississippi.
Donald Bermudez During Panel Discussion, Thomas Graning
Donald Bermudez During Panel Discussion, Thomas Graning
The Many Lives of Andrew Young
Image from the opening reception of "The Many Lives of Andrew Young" exhibit at the J.D. Williams Library, University of Mississippi.
Rodney Mims Cook, Jr. And Ambassador Andrew Young At Panel Discussion, Thomas Graning
Rodney Mims Cook, Jr. And Ambassador Andrew Young At Panel Discussion, Thomas Graning
The Many Lives of Andrew Young
Image from the opening reception of "The Many Lives of Andrew Young" exhibit at the J.D. Williams Library, University of Mississippi.
Cecelia Botero And Ambassador Andrew Young, Thomas Graning
Cecelia Botero And Ambassador Andrew Young, Thomas Graning
The Many Lives of Andrew Young
Image from the opening reception of "The Many Lives of Andrew Young" exhibit at the J.D. Williams Library, University of Mississippi.
Panel Discussion At Exhibit Opening, Thomas Graning
Panel Discussion At Exhibit Opening, Thomas Graning
The Many Lives of Andrew Young
Image from the opening reception of "The Many Lives of Andrew Young" exhibit at the J.D. Williams Library, University of Mississippi.
Dr. Ethel Scurlock And Ambassador Andrew Young During Panel Discussion, Thomas Graning
Dr. Ethel Scurlock And Ambassador Andrew Young During Panel Discussion, Thomas Graning
The Many Lives of Andrew Young
Image from the opening reception of "The Many Lives of Andrew Young" exhibit at the J.D. Williams Library, University of Mississippi.
Donald Bermudez During Panel Discussion, Thomas Graning
Donald Bermudez During Panel Discussion, Thomas Graning
The Many Lives of Andrew Young
Image from the opening reception of "The Many Lives of Andrew Young" exhibit at the J.D. Williams Library, University of Mississippi.
Ambassador Andrew Young Book Signing, Thomas Graning
Ambassador Andrew Young Book Signing, Thomas Graning
The Many Lives of Andrew Young
Image from the opening reception of "The Many Lives of Andrew Young" exhibit at the J.D. Williams Library, University of Mississippi.
Exhibit Panels, Thomas Graning
Exhibit Panels, Thomas Graning
The Many Lives of Andrew Young
Image from the opening reception of "The Many Lives of Andrew Young" exhibit at the J.D. Williams Library, University of Mississippi.
Panel Discussion At Exhibit Opening, Thomas Graning
Panel Discussion At Exhibit Opening, Thomas Graning
The Many Lives of Andrew Young
Image from the opening reception of "The Many Lives of Andrew Young" exhibit at the J.D. Williams Library, University of Mississippi.
Rodney Mims Cook, Jr. And Ambassador Andrew Young At Panel Discussion, Thomas Graning
Rodney Mims Cook, Jr. And Ambassador Andrew Young At Panel Discussion, Thomas Graning
The Many Lives of Andrew Young
Image from the opening reception of "The Many Lives of Andrew Young" exhibit at the J.D. Williams Library, University of Mississippi.
Ambassador Andrew Young During Panel Discussion, Thomas Graning
Ambassador Andrew Young During Panel Discussion, Thomas Graning
The Many Lives of Andrew Young
Image from the opening reception of "The Many Lives of Andrew Young" exhibit at the J.D. Williams Library, University of Mississippi.