In order to improve the strength and stiffness of shield cutterhead, the method of fuzzy mathematics theory in combination with the finite element analysis is a
通过对鄂尔多斯南部中国石化各探区的烃源岩分布、构造格局、砂体展布、成藏组合、断一缝疏导系统等分析研究，得出大面积岩性油藏形成的控制因素为广泛发育的烃源岩和储集砂体
Research on the distribution of smoke in tunnels is significant for the fire emergency rescue after an operating metro train catches fire. A dynamic grid techni
为了培养技能型人才、提高人才培养质量，河南农业职业学院不断探索校企合作课程开发的方法。认为校企合作开发课程应从建设相关制度、发挥专业建设指导委员会的作用、建立工学
Compared with natural magnetite concentrate, artificial magnetite with more lattice defects and higher activity tends to be oxidized. And the artificial magneti
通过对大民屯西陡坡沙四段岩心观察分析、测井特征解释、沉积储层的系统研究,认为研究区发育完整的扇三角洲沉积体系,前扇三角洲以泥岩和粉砂岩为主,同时在沈273、沈262井区可见由扇三角洲前缘亚相向前扇三角洲滑塌形成的典型透镜状浊流砂体;扇三角洲前缘以粉细岩、河道砂岩、砾质砂岩为主,发育广泛,物性较好,为油层主力发育区;扇三角洲平原岩性以砂砾岩为主,沉积主要为陆上沉积,沈267、沈357井可见明显的陆上
In order to study the bending behavior of aluminum alloy 7050 thick plate during snake hot rolling, several coupled thermo-mechanical finite element(FE) models
The mining space of large mining height coal face is large,the range of movement and caving of rock strata is large and the stability of supports at coal face i