共搜索到13486条信息,每页显示10条信息,共1349页。用时:0小时0分4秒406毫秒
include mining subsidence, low recovery ratio, too much dead ore in pillars, and pollution of phosphorus gypsum. Mining subsidence falls into four categories: curved ground and mesa, ground cracks and collapse hole, spalling and eboulement, slope slide and creeping. Measures to treat the mining subsidence were put forward: finding out and managing abandoned stopes, optimizing mining method (cut......
J. Cent. South Univ. (2018) 25: 831-842 DOI: https://doi.org/10.1007/s11771-018-3787-7 Theoretical and experimental investigation on internal gear pair with small sliding ratio PENG Shuai(彭帅)1, MA... 2018 Abstract: Aiming at the issue of sliding ratio, an internal gear pair is proposed which consists of an involute internal gear and a pinion with quadratic curve teeth. Particularly, the contact......
Cut slope reinforcement technique in open-pit minesYongtao Gao, Jianbo Sun, Shunchuan Wu, and Aibing JinCivil and Environmental Engineering School, University of Science and Technology Beijing, Beijing 100083, ChinaHighway Development Limited Company of Henan Province, Zhengzhou 450052, China摘 要:<正> The design and practice in supporting the cut......
......
Nanoceramic composites with duplex microstructure break the strength-toughness tradeoffJi Zou1,2,Hai-Bin Ma3,Jing-Jing Liu1,Wei-Min Wang1,Guo-Jun Zhang4,Zheng-Yi Fu11. State Key Laboratory of Advanced Technology for Materials Synthesis and Processing,Wuhan University of Technology2. School of Metallurgy and Materials,University of Birmingham3. China Nuclear Power Technology Research Institute4......
, the relations among collecting ratio, interfusing ratio of mullock and cutting depth of the mining cobalt-rich crusts in ocean were discussed. Furthermore, the multi-extremum problem about cutting depth was analyzed in mining at a certain interfusing ratio of mullock. Through introducing genetic algorithm (GA), the cutting depth-control problem when the collecting ratio is maximized by controlling......
......
Modeling of whole process of ageing precipitation and strengthening in Al-Cu-Mg-Ag alloys with high Cu-to-Mg mass ratio HOU Yan-hui(侯延辉)1, 2, 3, GU Yan-xia(谷艳霞)1, 2, LIU Zhi-yi (刘志义)1, 2, LI Yun...; Abstract: A physically based numerical model to predict the microstructure evolution and yield strength of high Cu-to-Mg mass ratio Al......
......
Arc erosion of AgSnO2 electrical contacts at different stages of a break operationJ. Swingler,A. SumptionSchool of Engineering Sciences,University of Southampton摘 要:Arc erosion studies are conducted on AgSnO2 contact materials at different stages in the break operation.A resistive load arrangement is used with up to 42 V DC at 24 A and a constant......