期刊文献+
共找到2篇文章
< 1 >
每页显示 20 50 100
Identification of Five Stages of Dike Swarms in the Shanxi-Hebei-Inner Mongolia Border Area and Its Tectonic Implications 被引量:9
1
作者 SHAOJi'an ZHAIMingguo +1 位作者 ZHANGLüqiao LIDaming 《Acta Geologica Sinica(English Edition)》 SCIE CAS CSCD 2004年第1期320-330,共11页
Dike swarms are generally ascribed to intrusion of mantle-source magma result from extension. Basic dike swarms around the Shanxi-Hebei-Inner Mogolia borders in the northern peripheral area of the North China Craton c... Dike swarms are generally ascribed to intrusion of mantle-source magma result from extension. Basic dike swarms around the Shanxi-Hebei-Inner Mogolia borders in the northern peripheral area of the North China Craton can be divided into five age groups according to isotopic dating: 1800-1700 Ma, 800-700 Ma, 230 Ma, 140-120 Ma, and 50-40 Ma. Geological, petrological and isotope geochemical features of the five groups is investigated in order to explore the variation of the mantle material composition in the concerned area with time. And the various extensional activities reflected by the five groups of dike swarms are compared with some important tectonic events within the North China Craton as well as around the world during the same period. 展开更多
关键词 dike swarms North China Craton extensional events isotopic dating global tectonic movement
下载PDF
Optimum Design of Laminates with Approximate Fully Isotropic Behaviors
2
作者 Pan Xinghen(潘星辰) 《Journal of Donghua University(English Edition)》 EI CAS 2001年第3期49-52,共4页
The paper presents an efficient stiffness optimization approach to fully isotropic laminates with approximate isotropic behaviors respect toboth extensional and bending stiffnesses. Based on the Integral global minimi... The paper presents an efficient stiffness optimization approach to fully isotropic laminates with approximate isotropic behaviors respect toboth extensional and bending stiffnesses. Based on the Integral global minimization method, the layer orientation angles andthe layer thickness ratios are chosen as design variablesand the lamination parameters are minimized to get theopthnal designs. Example of laminate with approximatefully isotropic behaviors is presented, which has lessthan one-third the number of plies of a fully isotropiclaminate. 展开更多
关键词 ISOTROPY laminate extensionAL and BENDING stiffnesses integral global optimization method
下载PDF
上一页 1 下一页 到第
使用帮助 返回顶部