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浏览/检索结果: 共3条，第1-3条 帮助 已选(0)清除 条数/页：5101520253035404550556065707580859095100   排序方式：请选择作者升序作者降序题名升序题名降序发表日期升序发表日期降序提交时间升序提交时间降序 Dynamic variation of Middle to Late Ordovician cephalopod provincialism in the northeastern peri-Gondwana region and its implications 期刊论文 PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY, 2019, 卷号: 521, 页码: 127-137 作者:  Fang, Xiang （方翔）;  Burrett, Clive;  Li, Wenjie;  Zhang, Yunbai （张允白）;  Zhang, Yuandong （张元动） 收藏  |  浏览/下载：75/0  |  提交时间：2019/05/22 Palaeobiogeography  Cluster Analysis  Non-metric Multidimensional Scaling  Network Analysis  Palaeolatitude  Plate Movement   Discussion on the relationship between the Yanshanian Movement and cratonic destruction in North China 期刊论文 SCIENCE CHINA-EARTH SCIENCES, 2018, 卷号: Vol.61 No.5, 页码: 499-514 作者:  Wang, Y;  Sun, LX;  Zhou, LY;  Xie, YT 收藏  |  浏览/下载：7/0  |  提交时间：2019/12/26 Yanshanian  Movement  North  China  Craton  destruction  Paleo-Pacific  Plate  subduction  Intracontinental  deformation  Layered  crustal  rotation   Motion mechanism analysis of a two-degree-of-freedom spherical motor (EI CONFERENCE) 会议论文 2nd International Conference on Information Engineering and Computer Science, ICIECS 2010, December 25, 2010 - December 26, 2010, Wuhan, China Guo K.; Cheng G.; Zeng P.; Huang J. 收藏  |  浏览/下载：12/0  |  提交时间：2013/03/25 The working principle of a two-degree-of-freedom piezoelectric spherical motor using only one piezoelectric element was analyzed. The resonance frequencies of the motor's plate type piezoelectric vibrator were calculated by finite element method. The computer simulation was executed to analyze the motion trajectory of the four contact points between the stator and the sphere. Simulation results verified that the four contact points can form timing reasonable elliptical trajectories which re designed to drive the sphere to form two rotation degrees of freedom. The conclusion indicated the formation of two-dimensional movement mechanism of the spherical motor. 2010 IEEE.