双场点地震危险性分析方法及其应用

提出了双场点地震危险性分析方法,用以计算在相同地震构造环境中,相同地震作用下的相邻两个工程场点同时超越其给定地震动参数的概率.该方法是确定系统的危险段落、场点遭受的附加地震危险的有效工具.基于汶川MS8.0地震后大渡河干流及邻近地区的地震环境,以大渡河干流梯级水电站系统为例,确定了大渡河干流梯级水电站各个河段的地震危险性.其中危险性最高的3个河段是:龚嘴—铜街子河段、沙坪—龚嘴河段和大岗山—龙头石河段.     

Geochronology and Significance of Granites Associated with Gold Deposits in the Jidong Area, China

The Jidong area is located on the north margin of the North China craton. It is a nucleus composed of the oldest rocks in China. Precambrian metamorphic rocks with various Phanerozoic granitoids invaded are widespread. Gold deposits here have close spatial relations to granitoids. Some deposits occur within them and others in the outer zone of the contact belt of the intrusion, extending thousands of metres. There have been controversial views in regard to the relations of the deposits to the intrusions although traditional techniques have been used to date the intrusions. In order to solve such a problem, the SHRIMP technique was adopted to date the U-Pb ages of zircon collected from the Yuerya intrusion which hosts the large-sized Yuerya Au deposit and Qingshankou intrusion 2 km away from the Jinchangyu (larger-sized) Au deposit. Analysis shows that the ages of 175±1 Ma and 174±3 Ma for Yuerya intrusion and the age of 199±2 Ma for Qingshankou granite indicate the Early Yanshanian stage of the Meso-     

黑河流域生态水文传感器网络设计

在黑河上游八宝河流域和中游盈科灌区,以无线传感器网络为纽带,高效集成流域尺度内密集分布的、多源异构传感器的各种气象、水文及生态观测项目,建立自动化、智能化、时空协同的、各观测节点远程可控的生态水文传感器综合观测网络;通过优化地面采样方案,精细观测和准确度量流域尺度内空间异质性较强的关键水文生态要素的时空动态过程、时空变异性和不确定性;研究针对星载/机载遥感真实性检验的地面传感器采样方案,精细验证遥感反演精度,深入挖掘各种遥感手段在流域综合观测中的作用和潜力;全面提高流域水文生态过程的综合观测能力和观测自动化水平。     

高美古全夜视宁度的变化

介绍了云南丽江高美古天文候选点,１９９５年１２月～１９９６年１１月全夜视宁度观测结果：全年平均ｒ０＝１６．５０ｃｍ（ＦＷＨＭ＝０．６７″）,夜平均极大值ｒｍａｘ＝２２．４１ｃｍ（０．４９″）,夜平均极小值ｒｍｉｎ＝１２．９５ｃｍ（０．８５″）。     

Optimal initial perturbations for El Nino ensemble prediction with ensemble Kalman filter

A method for selecting optimal initial perturbations is developed within the framework of an ensemble Kalman filter (EnKF). Among the initial conditions generated by EnKF, ensemble members with fast growing perturbations are selected to optimize the ENSO seasonal forecast skills. Seasonal forecast experiments show that the forecast skills with the selected ensemble members are significantly improved compared with other ensemble members for up to 1-year lead forecasts. In addition, it is found that there is a strong relationship between the forecast skill improvements and flow-dependent instability. That is, correlation skills are significantly improved over the region where the predictable signal is relatively small (i.e. an inverse relationship). It is also shown that forecast skills are significantly improved during ENSO onset and decay phases, which are the most unpredictable periods among the ENSO events.     

井中电磁波法探测关门山铅锌矿体的应用效果

本大讨论在老铅锌矿区,应用电磁波法寻找新矿体的可能性。根据方法特点,对应用的有利条件和不利因素作了论述。并用具体实例说明了电磁波法解决这类问题的有效性,讨论了工作技术的选择和异常解释的结果。     

南极冰盖中nssSO42-和NO3-传输路径初探

总结了南极冰盖中 nss SO4 2 - 和 NO3- 的主要来源 ,通过对南极冰盖中几种主要离子空间分布特征的分析 ,结合南极冰盖中不同区域火山活动记录的时间差 ,认为南极冰盖中的nss SO4 2 - 和 NO3- 很可能是通过远距离高空传输到极地冰雪中 ,具体过程为 :nss SO4 2 - 和 NO3-在对流层顶部平流层底部呈带状输送到极地上空 ,然后辐射下沉 ,再辐散到其他地区     

二溴羟基苯基萤光酮胶束增溶光度法测定痕量锗的研究及应用

系统地研究了二溴羟基苯基萤光酮在不同表面活性剂存在下与Ｇｅ的显色反应。在０．２－２．０ｍｏｌ／Ｌ的Ｈ２ＳＯ４介质中,显色反应灵敏度高（ε５１８＝１．４１×１０＾５）、显色速度快且至少稳定２４ｈ,干扰少,Ｇｅ量在０－５００ｎｇ／ｍｌ范围内符合比耳定律,经应用于矿石中痕量Ｇｅ的直接测定,证明方法可行。