题 目：Possible Future Satellite Gradiometry Mission After GOCE
报告人：Prof. Ho Jung Paik
（Department of Physics,University of Maryland,College Park,Maryland,USA）
摘 要：Sensitive superconducting accelerometers and gravity gradiometers have been developed for tests of laws of gravity, searches for new forces and particles, and gravity survey. These devices utilize benign properties of superconductors, as well as the enhanced mechanical stability of materials at cryogenic temperatures. By differencing the responses of two linear accelerometers in a superconducting circuit, a gravity gradiometer, which is immune to platform vibrations, has been constructed. The 4-K space cyrocoolers under development and near flight test can reduce the liquid helium payload to meet the stringent mass requirement of a low Earth orbiting satellite. With these two technologies combined, a possible future gravity gradiometry mission can improve the gravity sensitivity by two to three orders of magnitude over GOCE.
时 间：2010年5月24日（星期一）上午10:00
地 点：（北京西路2号）紫台大楼327教室
紫金山天文台学术委员会学术交流工作委员会
2010年5月21日
