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数字图书馆——现代信息世界中的“零重力”
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作者 吴珏 《医学情报工作》 2001年第6期65-66,共2页
简介数字图书馆的定义、特点及国内外发展概况。
关键词 数字图书馆 “零重力” 共享
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Reconfigurable robot based on modular joint concept
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作者 史士财 Xie Zongwu +6 位作者 Gao Xiaohui Jin Minghe Zhu Yingyuan Ni Fenglei Liu Hong Kraemer Erich Hirzinger Gerd 《High Technology Letters》 EI CAS 2006年第4期337-340,共4页
A reconfigurable modular robot was developed for a free-flying robot project. This robot was composed of 6 same modular joints and one gripper. In order to save space and cost for transporting it into the space, the r... A reconfigurable modular robot was developed for a free-flying robot project. This robot was composed of 6 same modular joints and one gripper. In order to save space and cost for transporting it into the space, the robot should be folded overall and locked. A big central hole in the modular joint was designed for the placement of the cables and plugs in the robot arm, which prevented them from damage of high temperature, radiation in the space environment and the motion of the robot. Multiple sensors were integrated into the fully modular joint, such as joint torque sensor, joint position sensor and temperature sensors, which made the joint more intelligent. A zero gravity experimental system was developed to verify the functions of the robot under zero gravity environment. 展开更多
关键词 space robot MODULAR MECHATRONICS zero gravity
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3D joint inversion of surface and borehole gravity data using zeroth-order minimum entropy regularization 被引量:1
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作者 Peng Guo-Min Sun Zhong-Yu Liu Zhan 《Applied Geophysics》 SCIE CSCD 2021年第2期131-144,272,共15页
Surface and borehole gravity data contain complementary information.Thus,the joint inversion of these two data types can help retrieve the real spatial distributions of density bodies.When a sharp boundary exists betw... Surface and borehole gravity data contain complementary information.Thus,the joint inversion of these two data types can help retrieve the real spatial distributions of density bodies.When a sharp boundary exists between an anomalous density body and its surrounding rock,the interface recovered by smooth inversion with Tikhonov regularization is not clear,leading to difficulties in the subsequent geological interpretation.In this work,we develop a joint inversion of surface and borehole gravity data using zeroth-order minimum entropy regularization.The method takes advantage of the complementary information from surface and borehole gravity data to enhance the imaging resolution of density bodies.It also produces a focused imaging of bodies through the zeroth-order minimum entropy regularization without requiring a preselection of a proper focusing parameter.We apply the developed joint inversion approach to three diff erent synthetic data sets.Inversion results show that the focusing inversion with the zeroth-order minimum entropy regularization provides a good description of the true spatial extent of anomalous density bodies.Meanwhile,the joint focusing inversion reconstructs a more reliable density model with a relatively high resolution when a density body is passed through by one or more boreholes. 展开更多
关键词 gravity anomaly surface gravity borehole gravity joint inversion zeroth-order minimum entropy regularization
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