武定地震序列剪应力场的时空分布特征

根据陈培善和Ｄuda提出的具有3模型的谱衰减模式,利用云南武定M ＝6.5地震序列的近场数字化记录资料,研究了近场地面运动峰值位移dm、峰值加速度am参数与环境应力t0值的依赖性．一个新的考虑是假定峰值参数与介质犙的相关性,并由此导出了用３种地面运动峰值参数测定环境应力t0值的３个关系式．用这些关系式计算了武定地震序列的环境应力t0值．结果表明,３个关系式计算的t0 值基本一致,绝大多数地震的平均t0值在5.0～35MPa的范围,属高应力值地震序列;高应力值被限制在紧靠主震震中附近的较小范围内,环境应力值的等值线的精细结构分布与强余震密切相关．对t0值的时空特征分析表明,该地震序列是在特定的地震构造交汇部位和高应力背景下发生的地震破裂过程．      

从第22届IUGG大会看地震预测研究

1999年 7月 19～ 3 0日 ,第 2 2届 IUGG大会在英国伯明翰大学举行。从提交的论文中可以看出 ,有关地震预测和地震灾害的研究仍是地学界关注的热点问题。文章介绍了这次大会反映出的有关地震预测研究的情况。     

滇西羊拉铜矿床稀土元素地球化学研究

滇西羊拉铜矿是近年来发现的大型铜矿床。本文系统研究了该矿床不同岩石、矿石、矿石矿物及脉石矿物的稀土元素地球化学特征,研究表明：矿区花岗闪长岩具有与壳幔型花岗岩类相似的稀土元素特征;早期形成的块状硫化物矿石及其矿物中稀土元素含量高,富集轻稀土,具有负Ｅｕ异常,与赋矿地层碎屑岩、硅质岩的稀土元素球粒陨石标准化配分相似,反映其成矿物质来源于上地壳;中晚期形成的夕卡岩矿石及破碎带充填、交代型矿石及其矿物中     

Estimating The Dust Particle Size Of Comet Hale–Bopp By Studying The Motion Of The Ejecta On September 10–11, 1996

We report the observation of an outburst of comet Hale–Bopp (C/1995 O1) happened on September 10–11, 1996, carried by the 1.56 m telescope of Shanghai Astronomical Observatory. Two ejecta were found in CCD images during the outburst. According to the positions of ejecta, we discuss the motion of the ejecta considering dust particles are subjected to the gravity and the Solar radiation pressure, and conclude that the mean radii of dust grains in the ejecta were about submicron-sized. So the observed X-ray emission are most likely produced by small size particles scattering the Solar X-ray. This revised version was published online in July 2006 with corrections to the Cover Date.     

南海夏季风暴发过程的低频特征

应用1979～1996年共18a的NOAA卫星OLR资料及NCEP/NCAR再分析850hPa风场资料,分析了夏季南海地区及南海季风暴发过程的某些低频特征。认为北半球夏季南海地区的低频活动较活跃,并且具有明显的年际变化,这种年际变化同南海季风的暴发时间有联系。南海地区的低频振荡在南海季风暴发后增强。通过对18a 及K*的时段叠加合成图的分析,发现南海夏季风的暴发同赤道印度洋低频振荡的东传及西太平洋低频扰动西传有密切联系,南海夏季风暴发期间南海地区将印度洋与西太平洋之间的低频活动联系在一起。     

太阳光谱仪用探测器的研究

观测太阳光谱所使用的探测器,在选型与使用上有其特殊性。结合云南天文台太阳光谱仪,首先建立了太阳光谱仪分光流量的计算机模型,并通过观测实验对该模型进行了检验。利用该模型计算了云南天文台太阳光谱仪各可见光及近红外波段的太阳光谱分光流量,在此基础上,详细讨论了太阳光谱仪用探测器的选型方案,以及观测中的注意要点。     

环境决策支持系统的设计及其在水质管理中的应用

ＥＤＳＳ（Ｅｎｖｉｒｏｎｍｅｎｔａｌ Ｄｅｃｉｓｉｏｎ Ｓｕｐｐｏｒｔ Ｓｙｓｔｅｍ）是一处适用于潮汐河网地区水环境管理和决策的软件系统,其主要功能是协助政府部门进行有效和科学的水环境管理。该系统采用地理信息系统、数据管理系统、模型库管理系统和专家系统等先进技术,将环境数据库、水动力与水质模型库、经济优化技术、环境专家以及环境法规有机地集成在一起。文中首先介绍了ＥＤＳＳ的组织方法、设计特征、实现技     

Effect of nitrogen and phosphorus on the growth of a red tide dinoflagellateScrippsiella trochoidea (Stein) Loeblich III

Scrippsiella trochoidea (Stein) Loeblich III was grown in a nitrogen-or phosphorus-limited batch culture system in laboratory. Growth rates and cellular Chl-a were measured as functions of nitrate and phosphate concentrations. Growth rates were hyperbolic with both nitrate and phosphate concentration and fit the Monod equation. The minimum cell quota of nitrogen and phosphorus and then the optimum N∶P ratio ofS. trochoidea were estimated in this study. Measurement of phosphate concentration in Jiaozhou Bay suggest that phosphorus is the limiting factor ofS. trochoidea growth. Contribution No. 3679 from the Institute of Oceanology, Chinese Academy of Sciences. Project 39790110 supported by NSFC, the study aslo supported by the National Climbing Project B (PDBG-7-2) and partly supported by an MF grant from Hong Kong University of Science and Technology.     

Centrifuge modelling of ground-borne vibrations induced by railway traffic in underground tunnels

Increased attention has been given to ground-borne vibrations induced by railway vehicles and to the effects of these vibrations as they propagate through the ground into nearby buildings.Various studies,mainly based on numerical methods as well as physical modelling,have been carried out to investigate this problem.To study the dynamic response of tunnels and the surrounding soil due to train-induced vibration loads,a centrifuge te st was conducted with a small-scale model in 1 g and 50 g stres...     

基于Ward聚类法的中国业务集合预报系统的产品开发

为开发中国新一代业务集合预报系统的聚类产品,系统地介绍了集合预报技术先进国家的集合预报聚类分析方法,并采用Ward聚类法开发了中国集合预报系统的聚类产品。针对重大天气过程初步分析了中国集合预报系统的聚类产品的业务预报能力。结果表明,Ward聚类法以凝练预报信息和给出发生概率的形式,有效地划分出最有可能出现的环流形势类型,为预报员提供了有价值的预报参考信息,也为科学合理地使用集合预报产品提供方便。