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| | According to the historical earthquake's data, in Xinjiang and its adjacency, the seismic activities approximately can be divided into three seismic periods, that is, 1716-1811, 1812-1901, and after 1902. Since 1882, it can be distinguished into five active curtains and five quiet curtains. From 1820, especially in twentieth century in Xinjiang and its adjacency, strong earthquake activities are evidently related to the rate changes of the earth's rotation. Based on the statistics and analyses, we hav... | | 根据历史地震资料,新疆及其邻区的地震活动大致可以分为三个地震期,即1716—1811年,1812—1901年和1902年后。自1882年以来的强震活动可以划分为五个活动幕和五个平静幕。 自1820年,尤其是20世纪以来,新疆及其邻区的强震活动与地球自转相对速率变化有明显的关系。根据统计分析,估计了本世纪末及21世纪初强震活动的潜在震源区及地震危险性。 | | 文摘来源 | | The increasing of the population and the shortage of natural resources are the two difficult problems whichman faces in the twenty-one century.So reasonable exploitation and rational use become the important way tomitigate the contradiction between them.According to the achievements in agricultural zoning and researchingmaterials in reserved natural resources,the author of this article analyses the current situation and potentiality ofexploiting at Yuan' an County.He also puts forward his ... | | 人口膨涨、资源短缺是人类21世纪面临的两大难题,合理开发和利用农业后备资源缓解人口与资源矛盾的重要途径。笔者根据农业区划成果和农业后备资源调查资料,分析了远安县农业后备资源的现状及开发潜力,提出了农业后备资源开发利用的设想,并针对性地提出了措施及建议. | | 文摘来源 | | The subsystem of measurement, control and communication is one of the seven important subsystems in space technology, which takes the roles of determining orbit and attitude, finding out spacecraft operating condition, controlling spacecraft operation, and exchanging information between space and ground. At first, the development of spacecrafts in the world is introduced, and then the development tendency and a blueprint of measurement, control and communication technology in the next two to three dec... | | 测控通信分系统是航天技术七大分系统的重要分系统之一,担负着确定轨道、姿态,了解航天器工况,控制航天器运行以及天地之间交换业务信息的重要任务。本文从介绍国际航天器发展开始,叙述了测控通信技术的发展趋势及今后二三十年内的发展蓝图,为我国航天技术在20世纪到21世纪的发展过程中测控通信分系统的模式提供一些设想。 | | 文摘来源 | |   | | << 更多相关文摘 |
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