Results 91 to 100 of about 359,678 (168)

Advances in outburst energy unit cutting theory and disaster prevention and control technologies in geological anomaly zones

Meitan kexue jishu
Geological anomaly areas in coal mines, characterized by high in-situ stress, elevated gas pressure, low permeability, and the development of tectonic coal, represent high-risk areas for coal and gas outbursts.
Jingyu JIANG, Liao HE, Chenghao WANG, Mintao WEI, Wenhua JIAO, Yuanping CHENG   +5 more
doaj   +1 more source

Analogy between anchor bolt failure and punching shear

, 2000
Similarities in the behaviour, analysis and design of anchor bolts and punching shear are discussed. The treatment of size effects in codes is compared.
Elfgren, Lennart,
core  

Design and Study of Pre-stretching and Disassembling Device for Double-row Chain

Jixie chuandong, 2019
Aiming at the pre-stretching and disassembling link in the manufacturing process of double-row chain, a new type of pre-stretching and disassembling device for double-row chain is designed.
Wang Shukun, Xu Yefeng, Liu Dongliang, Zhao Xudong, Shen Jiajun   +4 more
doaj  

Mechanism analysis of karst ground collapse caused by the construction of punching piles in Fuwan, Foshan City

Carsologica Sinica
In recent years, the increasing intensity of human engineering activities—such as groundwater extraction, drainage for underground engineering, mine drainage, blasting, pile foundation construction and drilling engineering—has led to karst ground ...
Shouyong YI, Long JIA, Qingding HAN, Xiyi LUO, Jie ZOU   +4 more
doaj   +1 more source

Prospects for the development of the theory and technology of non-hydration penetration enhancement in soft coal seams

Meitan xuebao
In the future quite a long historical period, China will still adhere to the basic national conditions of coal. The efficient exploitation of coal, as a guarantee energy source, is crucial to China's energy security.
Yong LIU, Wending ZHANG, Changjiang CHEN, Jianping WEI, Xiangyu XU, Hongtu ZHANG, Qincong NAN, Pengwei XIAO   +7 more
doaj   +1 more source

Hydraulic limits on tree performance: Transpiration, carbon gain and growth of trees [PDF]

An overview of the relationship between plant gas exchange, the potential hydraulic gradient, the size of the plant and its hydraulic conductance is presented.
Tyree, Melvin T.
core  

Development of Heavy 21CrMolO Steel Seamless Tube for Mold for Centrifugal Nodular Cast Iron Pipe

Teshugang, 2014
Two heats of steel 21CrMolO (/%: 0. 18G, 0.29 ~0. 30Si, 0. 25 ~0. 27Mn, 0.007 ~0.008P, 0.003S, 2. 40 ~2.42Cr, 0. 35 ~0. 37Mo) are melted by 30 t EAF-LF-VD-7.2 t casting ingot flow sheet.
张敏, 夏文斌, 冉旭, 王勇
doaj  

A Digital Hydraulic Valve, Actuated Using a Piezoelectric Linear Motor [PDF]

, 2011
Proportional control in hydraulics is widely utilized. The most widely used current types of proportional valves utilize solenoid technology. While this technology has been around for decades and has been proven an effective means of control, there is ...
Bevill, Brian C
core  

Current Status of Research on the Coal and Gas Outburst Control Technology of Hydration and Anhydrous. [PDF]

ACS Omega, 2023
Zhang J, Wang L, Chen X.
europepmc   +1 more source

Design of an Automatic Sorting and Punching Device for Cadre Personnel Files

To address low manual efficiency and punching inaccuracies an integrated intelligent device has been designed to automate the sorting and punching of cadre personnel files in accordance with national document revision standards.
Mu, L. L., Zheng, M. Y.
core   +1 more source