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; cutting parameters; surface roughness; cut and break ratio; surface qualities; optimal cutting condition  ... section in the laser cutting of a metallic sheet can be evaluated by the surface roughness, the formation of striations and the formation of the cut and break area. KARATAS et al[13] investigated......
J. Cent. South Univ. (2020) 27: 2959-2970 DOI: https://doi.org/10.1007/s11771-020-4521-9 In-site core disking phenomenon and break mechanism of hard marble: Investigation in 2400 m deep-buried... characteristics of core-disks’ break surface were analysis, using 3D optical scanning and electron microscope scanning. Moreover, the numerical back analysis was also used to simulate the drilling process......
J. Cent. South Univ. Technol. (2007)04-0504-05 DOI: 10.1007/s11771-007-0098-9 Determination of volatile components in cut tobacco with gas chromatography–mass spectrometry and chemometric... of cut tobacco samples with the help of heuristic evolving latent projections (HELP). After extracting with simultaneous distillation and extraction method, the volatile components in cut tobacco were......
Effect of extrusion ratio on microstructure and mechanical properties of AZ91D magnesium alloy recycled from scraps by hot extrusion HU Mao-liang(胡茂良), JI Ze-sheng(吉泽升), CHEN Xiao-yu(陈晓瑜... the scraps were extruded with the extrusion ratio of 40?1. Oxidation layers of the scraps were broken into pieces by high compressive and shear forces under the extrusion ratio of 40?1. The ultimate tensile......
with extrusion ratio of 100 was successfully applied to AZ31 Mg alloy at extrusion temperatures of 250, 300, and 350 ℃. This leads to both grain refinement due to grain break and the occurrence... Microstructure and mechanical properties of AZ31 Mg alloy processed by high ratio extrusion CHEN Yong-jun(陈勇军), WANG Qu-dong(王渠东), LIN Jin-bao(林金宝), ZHANG Lu-jun(张陆军), ZHAI Chun-quan(翟春泉......
尾矿库溃坝灾害事故树分析束永保1,李仲学1(1.北京市北京科技大学土木与环境工程学院)摘 要:根据国内发生的尾矿库主要溃坝事故,运用事故树方法从自然灾害,坝体质量问题,人因管理缺陷等3个方面对尾矿库溃坝事故进行了研究,指出地震,库区山体滑坡,排水设施破坏,坝体失稳,人因管理缺陷是引发尾矿库溃坝事故的主要原因,提出了相应的事故预防措施,可为尾矿坝运行阶段的安全管理提供依据.关键词:尾矿库; 溃坝; 事故树; 分析; 安全管理......
J. Cent. South Univ. (2016) 23: 3079-3084 DOI: 10.1007/s11771-016-3372-x Effects of MgO content and CaO/Al2O3 ratio on surface tension of calcium aluminate refining slag XU Ji-fang(许继芳)1, ZHANG Jie... method at 1823 K. Based on different levels of the MgO content and the mass ratio of CaO to Al2O3, the effects of MgO content and the mass ratio of CaO to Al2O3 on surface tension were investigated......
J. Cent. South Univ. (2016) 23: 2669-2675 DOI: 10.1007/s11771-016-3328-1 Mass ratio design based on compaction properties of backfill materials LI Meng(李猛), ZHANG Ji-xiong(张吉雄), HUANG Peng(黄鹏), GAO... Berlin Heidelberg 2016 Abstract: The backfill-mining mass ratio is the ratio of the mass of the backfill materials in the goaf to the mass of the produced raw coal during solid backfill mining......
Warm hydroforming of magnesium alloy tube with large expansion ratio LIU Gang(刘 钢), TANG Ze-jun(汤泽军), HE Zhu-bin(何祝斌), YUAN Shi-jian(苑世剑) School of Materials Science and Engineering, Harbin... alloy tubular part with a large expansion ratio. Effects of temperature on the mechanical properties and formability were studied by uniaxial tensile test and hydraulic bulge test. Total elongation......
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......