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2021

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Articles 2761 - 2790 of 9983

Full-Text Articles in Engineering

Construction And Application Of "Eight In One" Closed-Loop Management And Control Mode Of Roof Water Disaster In Coal Mines, Liu Qingbao, Ding Xiang, Feng Jie, Zhang Kun Aug 2021

Construction And Application Of "Eight In One" Closed-Loop Management And Control Mode Of Roof Water Disaster In Coal Mines, Liu Qingbao, Ding Xiang, Feng Jie, Zhang Kun

Coal Geology & Exploration

Construction and application of "eight in one" closed-loop management and control mode of roof water disaster in coal mines


Introductions And Applications Of A Self-Locking Wire-Line Coring System With A Water-Shielding Bit And A Circlip-Shielded Core Barrel, Liao Yuansu, Hu Qifeng Aug 2021

Introductions And Applications Of A Self-Locking Wire-Line Coring System With A Water-Shielding Bit And A Circlip-Shielded Core Barrel, Liao Yuansu, Hu Qifeng

Coal Geology & Exploration

Introductions and applications of a self-locking wire-line coring system with a water-shielding bit and a circlip-shielded core barrel


Development And Application Of Borehole Sealing Technology For Water-Sand Inrush From Ordovician Limestone Aquifer In Coal Mine, Li Xiaolong Aug 2021

Development And Application Of Borehole Sealing Technology For Water-Sand Inrush From Ordovician Limestone Aquifer In Coal Mine, Li Xiaolong

Coal Geology & Exploration

Development and application of borehole sealing technology for water-sand inrush from Ordovician limestone aquifer in coal mine


Hydraulic Connection Of Aquifers In Barapukuria Coal Mine, Bangladesh, Yu Bo, Wang Hao, Liu Feng, Liu Ji, Wang Qiangmin, Shang Hongbo Aug 2021

Hydraulic Connection Of Aquifers In Barapukuria Coal Mine, Bangladesh, Yu Bo, Wang Hao, Liu Feng, Liu Ji, Wang Qiangmin, Shang Hongbo

Coal Geology & Exploration

Hydraulic connection of aquifers in Barapukuria Coal Mine, Bangladesh


Regularity And Control Of Overburden And Surface Fractures In Shallow-Contiguous Seams, Cao Jian, Huang Qingxiang Aug 2021

Regularity And Control Of Overburden And Surface Fractures In Shallow-Contiguous Seams, Cao Jian, Huang Qingxiang

Coal Geology & Exploration

Regularity and control of overburden and surface fractures in shallow-contiguous seams


Improvement Of Shear Strength And Anti-Disintegration Performance Of Compacted Loess, Zhu Yanbo, Li Hongfei, Ju Zhitong, Lan Hengxing, Liu Zhenqian, Han Yutao Aug 2021

Improvement Of Shear Strength And Anti-Disintegration Performance Of Compacted Loess, Zhu Yanbo, Li Hongfei, Ju Zhitong, Lan Hengxing, Liu Zhenqian, Han Yutao

Coal Geology & Exploration

Improvement of shear strength and anti-disintegration performance of compacted loess


Study On The Strength And Microstructure Of Loess Under Freeze-Thaw Based On Temperature Path, Long Jianhui, Zhang Lingling, Xing Xianli, Guo Xiaojuan Aug 2021

Study On The Strength And Microstructure Of Loess Under Freeze-Thaw Based On Temperature Path, Long Jianhui, Zhang Lingling, Xing Xianli, Guo Xiaojuan

Coal Geology & Exploration

Study on the strength and microstructure of loess under freeze-thaw based on temperature path


Exploration Method Of Underground Geological Anomaly And Its Application Based On Directional Drilling, Fang Jun Aug 2021

Exploration Method Of Underground Geological Anomaly And Its Application Based On Directional Drilling, Fang Jun

Coal Geology & Exploration

Exploration method of underground geological anomaly and its application based on directional drilling


Study On Exploitation And Utilization Mode Of Tourism Resources Of The Underground Space In Abandoned Mines, Han Yun, Liu Qinjie, Wu Benniu, Yang Ke, Dong Zhiyong Aug 2021

Study On Exploitation And Utilization Mode Of Tourism Resources Of The Underground Space In Abandoned Mines, Han Yun, Liu Qinjie, Wu Benniu, Yang Ke, Dong Zhiyong

Coal Geology & Exploration

Study on exploitation and utilization mode of tourism resources of the underground space in abandoned mines


Hazard Source Effect And Location Experiment Of Concealed Water Disaster In Coal Seam Floor, Li Panfeng Aug 2021

Hazard Source Effect And Location Experiment Of Concealed Water Disaster In Coal Seam Floor, Li Panfeng

Coal Geology & Exploration

Hazard source effect and location experiment of concealed water disaster in coal seam floor


Prediction Of The Height Of Water Flowing Fractured Zone Based On Pso-Bp Neural Network, Lou Gaozhong, Tan Yi Aug 2021

Prediction Of The Height Of Water Flowing Fractured Zone Based On Pso-Bp Neural Network, Lou Gaozhong, Tan Yi

Coal Geology & Exploration

Prediction of the height of water flowing fractured zone based on PSO-BP neural network


Assessing Risk At The National Strategic Level: Visualization Tools For Military Planners, Wade A. Germann, Heather S. Gregg Aug 2021

Assessing Risk At The National Strategic Level: Visualization Tools For Military Planners, Wade A. Germann, Heather S. Gregg

The US Army War College Quarterly: Parameters

The reemergence of great power competition, conflict with near-peer competitor states below the level of armed conflict, and persisting threats from nonstate actors with transnational ambitions and global reach pose challenges for strategists planning, executing, and assessing military operations and strategy. Building on current visualization tools, two proposed models—the National Strategic Risk Abacus and the National Strategic Risk Radar Chart—address these challenges and better depict how the US military may inadvertently contribute to risk at the national strategic level.


Hope Versus Reality: The Efficacy Of Using Us Military Aid To Improve Human Rights In Egypt, Gregory L. Aftandilian Aug 2021

Hope Versus Reality: The Efficacy Of Using Us Military Aid To Improve Human Rights In Egypt, Gregory L. Aftandilian

The US Army War College Quarterly: Parameters

Using US military aid as a lever to achieve human rights reforms has proven only marginally effective. This article examines the approaches employed by the Obama and Trump administrations to US military aid to Egypt and proposes practical steps that can be taken by policymakers and the military personnel on the ground to advance US human rights values.


The Evolution Of Hybrid Warfare: Implications For Strategy And The Military Profession, Ilmari Käihkö Aug 2021

The Evolution Of Hybrid Warfare: Implications For Strategy And The Military Profession, Ilmari Käihkö

The US Army War College Quarterly: Parameters

The concept of hybrid war has evolved from operational-level use of military means and methods in war toward strategic-level use of nonmilitary means in a gray zone below the threshold of war. This article considers this evolution and its implications for strategy and the military profession by contrasting past and current use of the hybrid war concept and raising critical questions for policy and military practitioners.


Table Of Contents, The Editors Aug 2021

Table Of Contents, The Editors

Coal Geology & Exploration

No abstract provided.


Development Characteristics Of Coal Microfracture And Coal Petrology Control Under Cyclic High Voltage Electrical Pulse, Li Hengle, Qin Yong, Zhou Xiaoting, Zhang Yongmin, Chen Yilin Aug 2021

Development Characteristics Of Coal Microfracture And Coal Petrology Control Under Cyclic High Voltage Electrical Pulse, Li Hengle, Qin Yong, Zhou Xiaoting, Zhang Yongmin, Chen Yilin

Coal Geology & Exploration

Development characteristics of coal microfracture and coal petrology control under cyclic high voltage electrical pulse


Temporal And Spatial Evolution Of Surface Thermal Environment In Huainan Mining Area In The Last Decade, Fang Liangcheng, Chen Yongchun, An Shikai, Xu Yanfei, Zhao Yuejiao, Wang Ning, Li Zhihui, Zhao Ping Aug 2021

Temporal And Spatial Evolution Of Surface Thermal Environment In Huainan Mining Area In The Last Decade, Fang Liangcheng, Chen Yongchun, An Shikai, Xu Yanfei, Zhao Yuejiao, Wang Ning, Li Zhihui, Zhao Ping

Coal Geology & Exploration

Temporal and spatial evolution of surface thermal environment in Huainan Mining Area in the last decade


Numerical Study Of Mabian Landslide Kinematics And Impact Intensity, Chen Xing, Zhao Zhou, Wei Jiangbo, Xu Chong Aug 2021

Numerical Study Of Mabian Landslide Kinematics And Impact Intensity, Chen Xing, Zhao Zhou, Wei Jiangbo, Xu Chong

Coal Geology & Exploration

Numerical study of Mabian landslide kinematics and impact intensity


Great (Soft) Power Competition: Us And Chinese Efforts In Global Health Engagement, Michael W. Wissemann Aug 2021

Great (Soft) Power Competition: Us And Chinese Efforts In Global Health Engagement, Michael W. Wissemann

The US Army War College Quarterly: Parameters

Global health engagement, an underutilized strategy rooted in the strengths of soft power persuasion, can lead to more military-to-military cooperation training, help establish relationships that can be relied on when crises develop, stabilize fragile states, and deny violent extremist organizations space for recruiting and operations. Examining Chinese efforts worldwide to curry favor and influence and the challenges posed by the COVID-19 pandemic, this article shows health as a medium is a very compelling and advantageous whole-of-government approach to national security policy concerns.


Samuel Huntington, Professionalism, And Self-Policing In The Us Army Officer Corps, Brian Mcallister Linn Aug 2021

Samuel Huntington, Professionalism, And Self-Policing In The Us Army Officer Corps, Brian Mcallister Linn

The US Army War College Quarterly: Parameters

Drawing on Samuel P. Huntington’s three phases of self-regulation used to determine if an occupation qualifies as a profession, this article focuses on the third phase of policing and removing those who fail to uphold the standards set forth in the first two phases. It reviews how the US Army implemented this phase following the Civil War through the post–Vietnam War years and the implications for the officer corps.


Creation Of A Cip Method For The Heat Exchangers At Rolls-Royce, Melanie Howe, Austin Williams, Caroline Dempsey, Bethany Fralick Aug 2021

Creation Of A Cip Method For The Heat Exchangers At Rolls-Royce, Melanie Howe, Austin Williams, Caroline Dempsey, Bethany Fralick

Journal of the South Carolina Academy of Science

Rolls-Royce produces various engines which must be tested prior to their distribution to ensure a high-quality product. The manufacturing plant contains four test cells where the engines can be subjected to high levels of torque and extreme temperatures. A heat exchanger is necessary in this testing system and over time, unwanted waste accumulates on the system’s plates. The team is tasked with developing and implementing a system mounted on a mobile cart which can provide data to determine whether the plates need to be cleaned. For this cleaning system to work, it must fully saturate the heat exchanger in cleaning …


The Effect Of Noise-Reducing Acoustic Panels On The Noise Levels And Overall Safety Of Infant Sleep Machines, Pranav Poola Aug 2021

The Effect Of Noise-Reducing Acoustic Panels On The Noise Levels And Overall Safety Of Infant Sleep Machines, Pranav Poola

Journal of the South Carolina Academy of Science

Infant sleep machines (ISMs) are devices used to help infants fall asleep faster and stay asleep for longer amounts of time, yet they can often be too loud for infantile ears, which could potentially be dangerous. This research aimed to minimize the risks of infant sleep machines without reducing the effectiveness of the infant sleep machines themselves through the use of acoustic panels. Based on previous studies, it was hypothesized that the acoustic panels would reduce the noise levels of the ISM to less than recommended limits of 50 dB-A. A specific corner of a designated room was prepared with …


Merging Of Horizontally And Vertically Separated Small-Scale Buoyant Flames, Thomas H. Fletcher, Denver Haycock, Seth Tollefsen, David Lignell Aug 2021

Merging Of Horizontally And Vertically Separated Small-Scale Buoyant Flames, Thomas H. Fletcher, Denver Haycock, Seth Tollefsen, David Lignell

Faculty Publications

The purpose of this study was to investigate the merging behavior of small-scale buoyant flames that might be representative of flames from a leaf in a shrub. Zirconia felt pads soaked in n-heptane were suspended on thin rods and spaced both horizontally and vertically. Time-dependent video images from flames from two-pad and three-pad configurations were analyzed to determine merging probability, combined flame characteristics (height, area, and width), and changes in burn time. Correlations of these combined flame characteristics were developed based on horizontal and vertical spacing between the pads. Merging probability correlated with an exponential function that was quadratic in …


Book Reviews, Usawc Press Aug 2021

Book Reviews, Usawc Press

The US Army War College Quarterly: Parameters

No abstract provided.


Fault Recognition Based On Principal Component Analysis And K-Nearest Neighbor Algorithm, Zou Guangui, Ren Ke, Ji Yin, Ding Jianyu, Zhang Shaomin Aug 2021

Fault Recognition Based On Principal Component Analysis And K-Nearest Neighbor Algorithm, Zou Guangui, Ren Ke, Ji Yin, Ding Jianyu, Zhang Shaomin

Coal Geology & Exploration

Fault recognition based on principal component analysis and k-nearest neighbor algorithm


Application Of In-Seam Wave Technology In Geological Anomaly Detection Of Yangquan Mining Area, Fan Deyuan, Wu Guoqing, Ma Yanlong Aug 2021

Application Of In-Seam Wave Technology In Geological Anomaly Detection Of Yangquan Mining Area, Fan Deyuan, Wu Guoqing, Ma Yanlong

Coal Geology & Exploration

Application of in-seam wave technology in geological anomaly detection of Yangquan Mining Area


Love Wave Full Waveform Inversion Via Pseudo-Hessian Gradient Pre-Conditioning Operator, Guan Jianbo, Li Yu, Yin Caiyun, Yang Zhi, Jin Chaobin, Zhao Meng, Yang Hang Aug 2021

Love Wave Full Waveform Inversion Via Pseudo-Hessian Gradient Pre-Conditioning Operator, Guan Jianbo, Li Yu, Yin Caiyun, Yang Zhi, Jin Chaobin, Zhao Meng, Yang Hang

Coal Geology & Exploration

Love wave full waveform inversion via Pseudo-Hessian gradient pre-conditioning operator


Research On The Model Of Accurate Exploitation And Utilization Of Underground Space Resources In Closed/Abandoned Mines, Liu Qinjie, Wang Jinjiang, Yang Ke, Di Shengjun, Dong Zhiyong Aug 2021

Research On The Model Of Accurate Exploitation And Utilization Of Underground Space Resources In Closed/Abandoned Mines, Liu Qinjie, Wang Jinjiang, Yang Ke, Di Shengjun, Dong Zhiyong

Coal Geology & Exploration

Research on the model of accurate exploitation and utilization of underground space resources in closed/abandoned mines


Spatial-Temporal Distribution Of Outburst Accidents From 2001 To 2020 In China And Suggestions For Prevention And Control, Zhang Chaolin, Wang Enyuan, Wang Yibo, Zhou Xifang Aug 2021

Spatial-Temporal Distribution Of Outburst Accidents From 2001 To 2020 In China And Suggestions For Prevention And Control, Zhang Chaolin, Wang Enyuan, Wang Yibo, Zhou Xifang

Coal Geology & Exploration

Spatial-temporal distribution of outburst accidents from 2001 to 2020 in China and suggestions for prevention and control


Water Inflow Forecasting Method Of Deep Buried Coal Working Face In Northern Ordos Basin, China, Yang Jian, Wang Hao, Liang Xiangyang, Huang Hao Aug 2021

Water Inflow Forecasting Method Of Deep Buried Coal Working Face In Northern Ordos Basin, China, Yang Jian, Wang Hao, Liang Xiangyang, Huang Hao

Coal Geology & Exploration

Water inflow forecasting method of deep buried coal working face in northern Ordos Basin, China