TDE系列地震数据采集器

ＴＤＥ系列地震数据采集器是一套１６位（ＴＤＥ－２１６Ｃ）／２４位（ＴＤＥ－２２４Ｃ）地震数据采集器。该采集器为低功耗、程控增益、现场模数转换,其带宽为（０～２０Ｈｚ）,动态范围为９０ｄＢ（ＴＤＥ－２１６Ｃ）／１２０ｄＢ（ＴＤＥ－２２４Ｃ）。采集器通过接收ＧＰＳ信号产生精确定时。介绍了该采集器的技术设计方案、性能及实际应用效果。     

黄子洞台地电自动测量系统ATS及与电子自动补偿仪(DDC—2B)的对比观测

文献〔1〕是我们提出的地电阻率自动测量系统(Automatie Test System,简称ATS)的设计方案。1986年我们在黄子洞地电台对该系统进行了安装和调试,在一系列试验的基础上确定了适用于黄子洞台的地电阻率最佳测试程序。系统于1986年7月起投入与DDC—2B的对比观测.初步结果表明,ATS的各项技术指标及观测结果均达到和超过地电观测规范的要求,其观测精度比电子自动补偿仪DDC—2B高一个数量级。     

减灾与广东的经济发展

随着国家经济建设的发展，各种自然灾害所造成的经济损失将越来越大，资料显示，广东省在1993－1997年间因各种自然灾害所造成的直接损失平均每年约达180亿元，约占我省国民生产总值年增长的20％，本文提出了建立和健全具有政府职能的减灾组织机构，通过立法保证减灾制度的落实，提高城市规划及各种基础设施建设的减灾预防标准，充分发挥高新技术在减灾中的作用，从教育入手提高全民的防灾意识等几条减灾措施。     

The origin of the Earth

It is not possible to consider the formation of the Earth in isolation without reference to the formation of the rest of the solar system. A brief account is given of the current scientific consensus on that topic, explaining the origin of an inner solar system rocky planet depleted in most of the gaseous and icy components of the original solar nebula. Volatile element depletion occurred at a very early stage in the nebula, and was probably responsible for the formation of Jupiter before that of the inner planets. The Earth formed subsequently from accumulation of a hierarchy of planetesimals. Evidence of these remains in the ancient cratered surfaces and the obliquities (tilts) of most planets. Earth melting occurred during this process, as well as from the giant Moon-forming impact. The strange density and chemistry of the Moon are consistent with an origin from the mantle of the impactor. Core-mantle separation on the Earth was coeval with accretion. Some speculations are given on the origin of the hydrosphere.     

Seasonal and spatial distribution of nonylphenol and IBP in Saemangeum Bay, Korea

In order to investigate spatial and temporal distribution of organic pollutants in the Saemangeum Bay, organophosphorus pesticides (10), alkylphenols (8), chlorophenols (2), bisphenol A were analyzed from the surface seawater taken in 2002–2003. Most of the analytes were not detected in all stations except nonylphenol and S-benzyl-O,O-di-isopropyl phosphorothioate (IBP). Concentrations of nonylphenol and IBP ranged from ND to 298 ng/l and from ND to 1840 ng/l, respectively. The high levels of nonylphenol and IBP were found in the estuary areas of Mangyeong and Dongjin River. The levels of nonylphenol and IBP in surface seawater varied through seasons and the high levels of nonylphenol and IBP were in summer season (August). Based on real time monitoring of IBP and on correlation between concentrations of target compounds and contents of salinity in seawater, physical mixing and diffusion of seawater were found to be the major factors that affect the spatial distribution of IBP and nonylphenol in the Saemangeum Bay environment.