摘要：The Tsinghua 1 Micro satellite, the first satellite made by Tsinghua University, was launched in 2000. The power system of the Tsinghua 1 Micro satellite is one of the most important subsystems. It provides all the power for the satellite platform and the payloads. The power system design includes the regulation, protection and distribution of a 45;35 W solar array and 7 Ah NiCd batteries. This subsystem essentially offers two buses: an unregulated 14 V bus and a regulated 5 V bus. All distributed power lines to the users are protected by current tripping switches. In addition, some essential loads, such as the tele command system, are supplied through fuses. The Tsinghua 1 Micro satellite power system provides an efficient, flexible, reliable, and cost effective solution for small satellites in low earth orbit. A better maximum power point tracking method has been used to increase reliability margins and to increase the efficiency of the power system. The power system reliability was evaluated using several different tests, such as the power board test, the assembly integrate test (AIT), the electromagnetic compatibility (EMC) test and the thermal vacuum test (TVT).

摘要：由于种种原因,凡是一些对于当地社区以及环境会有重大影响的大型工厂或基础建设项目,总会引起激烈的争议。本文论述在瑞典南部一条穿过哈兰德萨斯(Hallandsas)山岭的大型铁路隧道工程中当地社区的反应。现代工业社会中的一项关键问题是,由国家设计和批准的认为发展经济所必需的项目如何能够在一个在时间和空间上有着特殊的历史和传统意义的环境中得以实施。本文以哈兰德萨斯隧道工程为例,对有关风险意识问题、对政府部门、工业和管理部门的信任问题以及各个集团认为有关的知识进行讨论。