Results 101 to 110 of about 381,789 (309)
, 2018 We develop predictive formulas for friction resistance in ducts with complex cross-sectional shape based on the use of the log law and neglect of wall shear stress nonuniformities. The traditional hydraulic diameter naturally emerges from the analysis as
Pirozzoli, Sergio
core +1 more source
Assimilating SAR-derived water level data into a hydraulic model: a case study [PDF]
, 2011 Satellite-based active microwave sensors not only provide synoptic overviews of flooded areas, but also offer an effective way to estimate spatially distributed river water levels.
De Keyser, Robain +10 more
core +2 more sources
Meitan xuebaoThe liquid supply system of coal face in underground coal mine provides high pressure and large flow hydraulic power for hydraulic support, and its performance and reliability are the key to the safe, intelligent and efficient work of fully mechanized ...
Jiyun ZHAO +6 more
doaj +1 more source
Approximate estimation of fatigue life of hydraulic support
Gong-kuang zidonghua, 2017 In view of problem that conventional life approximate analytical method of hydraulic support needs cyclic loading and acquisition of dangerous points which leads to increase of computer load, a life estimation model based on genetic algorithm and BP ...
WANG Jingtao +5 more
doaj +1 more source
Communication system of hydraulic support electro-hydraulic controller with fault diagnosis function
Gong-kuang zidonghua, 2022 There are many communication nodes, long communication distance and complex electromagnetic environment in fully mechanized working face. The existing communication system of hydraulic support electro-hydraulic controller generally lacks fault diagnosis function. In order to solve this problem, a set of communication system of hydraulic support electro-
SONG Danyang +4 more
openaire +1 more source
Advanced Healthcare Materials, EarlyView.This review highlights recent advances in smart face masks that actively monitor breathing. By integrating humidity, gas, temperature, pressure, strain, and triboelectric sensors, these masks track key respiratory parameters in real time. The article summarizes sensor mechanisms, compares performance across studies, and discusses challenges and future ...
Negin Faramarzi +7 more
wiley +1 more source
Coal-rock interface detector [PDF]
, 1979 A coal-rock interface detector is presented which employs a radioactive source and radiation sensor. The source and sensor are separately and independently suspended and positioned against a mine surface of hydraulic pistons, which are biased from an air
Crouch, C. E., Jones, E. W., Rose, S. D.
core +1 more source
Meitan kexue jishuCoal is the key energy source in China, and it is of great strategic significance to ensure the safe and efficient mining of coal resources in China. China’s coal resources are mainly mined by shaft mining, the production environment is harsh and the ...
Qingliang ZENG +4 more
doaj +1 more source
Gong-kuang zidonghua, 2017 In view of safety problems such as premature separation of roof, advance of cutting line and rib fall of coal wall caused by being lack of initial support force of hydraulic support, a manual pressurization device for initial support force of hydraulic ...
CAO Lianmin +4 more
doaj +1 more source
Advanced Healthcare Materials, EarlyView.Inspired by the water‐rich and interconnected biopolymer networks of native load‐bearing tissues, we disclose a connectable design for a hybrid filamentous supramolecular and covalent double network hydrogel generated through in situ photopolymerization.
Ciqing Tong +11 more
wiley +1 more source