基于静止锋的强对流过程个例诊断分析

本文利用常规天气图、中尺度暴雨 η模式输出的物理量场和红外卫星云图资料对 1999年 7月 18日 0 8时～ 7月 19日 0 8时东南沿海 2 1～ 30°N ,110～ 12 2°E范围内的强对流过程进行了分析 ,并仔细考察了对流云团强烈发展的前期条件。结果表明 :此次强对流过程与副高边缘的强暖湿不稳定及准静止锋的活动有关 ,静止锋活动是产生雷暴的直接原因 ,同时也与午后的热对流运动有关。对流不稳定和惯性不稳定是这次雷暴的触发机制 ,相对湿度和对流有效位能的大值中心附近未来可能将有雷暴出现。     

再论长英质隐爆角砾岩的气热流体溶浸成矿机制——隐爆角砾岩型铀矿床的稳定同位素地球化学证据

为进一步阐明长英质隐爆角砾岩的成因及其气热溶浸成矿流体和成矿物质的来源，文章对闽北570有赣南6722隐爆角砾岩型铀矿床的矿石矿物，蚀变围岩，基底岩石的氧，氢，硫，碳，铅同位素地球化学特征进行了综合研究，并得出以下结论：（1）在主成矿期和矿后期有大气降水成分的外来水混合加入成矿流体；（2）蚀变流纹岩和蚀变花岗岩的水－岩氧原子质量比值（分别为0．21和0．26）为隐爆角砾碉的岩浆－外来水混合爆发模式提供了佐证；（3）成矿流体中的矿化剂组分（CO3^-2 ,HCO3^-,HS^-等）主要来自壳幔深部。（4）成矿物质不仅与赋矿主岩（火山岩）有关，而且部分来自基底岩石（花岗岩和变质岩）。     

Seismological Activities in Malaysia

In this paper,the development of the National Seismic Network of Malaysia is described firest.Then,the maximum intensities on the Modified Mercalli(MM) scale experienced by Peninsular Malaysia and East Malaysia and the damage to man-made structures caused by earthquakes are analyzed.Finally,the seismicrisk management and strategy to mitigate seismic risk in Malaysia are outlined.     

Dynamic failure numeric simulations of model concrete-faced rock-fill dam

Conventional numeric simulations of rock-fill dams are generally performed finite element method (FEM), in which the rock-fill body is treated as continuum material. But the rock-fill body possesses strong discontinuity and FEM based on continuum idealization cannot simulate its failure process. The discontinuous deformation analysis (DDA) method is just the right tool of solving this problem satisfactorily. In this paper, two kinds of model dams, i.e. homogeneous rock-fill dam and concrete-faced rock-fill dam, are simulated using DDA method, their characteristics of response and failure process are presented. The results from numerical simulations are consistent with those from the author's previous dynamic experiments.     

高温高压下岩石的电性研究

高温高压下岩石的电性研究是了解地球内部物质组成、运移及演化的重要手段,因而日益受到地球物理学界人士的青睐．本文从测量方法、设备及影响因素等方面介绍了高温高压下电性研究的发展进程,探讨了高温高压下电性研究的发展方向．      

TVA与澜沧江流域的综合开发与管理研究

本文首先概述了田纳西流域基本情况及其开发与管理机构（ＴＶＡ）的成立背景、发展历史和成就；分析了澜沧江流域与ＴＶＡ对比研究的基础，借鉴ＴＶＡ的经验，提出澜沧江流域综合开发与管理的思路、重要领域、矛盾协调等问题。     

旱灾对大同市粮食产量的影响评估

本文对大同市粮食产量与气候因子进行统计分析，把作物各生育时段的降水量与气象产量的关系进行回归分析，建立相关方程，从而得出由于干旱造成的产量损失评估模型。     

Histortical seismicity of the offshore Fujian-Guangdong region

The earthquakes offshore Fujian and Guangdong Provinces concentrated along the two segments near Nan’ao in the south and Quanzhou in the north of the off coast fault, which is very active since the late Pleistocene. In 1918 and 1906, two earthquakes with magnitudes 7.3 and 6.1 respectively occurred in the south and the north regions. With the instrumentally determined seismic parameters of these two earthquakes as standards, the author evaluated the parameters of the historical earthquakes by comparing their macroseismic materials with consideration of the geological background. As a result, chronological tables of historical earthquakes of the south and the north regions were compiled. The seismic activity of the two regions synchronized basically, and their strongest recorded earthquakes were both aroundM _s 7.3. Seismic activity usually intensified before the occurrence of strong events. Aftershocks were frequent, but strong aftershocks usually occurred one to several years after the main shock. Two high tides of seismic activity occurred since the late 15th century. Around 1600, eight earthquakes each with magnitudes over 4.3 occurred in both of the two regions. The magnitude of the strongest shock in the south region is 6.7, that in the north region is 7.5. The second high tide occurred at the early 20th century. Among the 18 earthquakes occurred in the south region, one was of magnitude 7.3; whilst only two earthquakes with magnitudes 6.1 and 5.5 respectively occurred in the north region. Further, medium to strong earthquakes never occurred since 1942. Whether this is the “mitigation effect” of strong shocks, or a big earthquake is brewing in the north region is worth intensive study. The Chinese version of this paper appeared in the Chinese edition ofActa Seismologica Sinica,13, 505–515, 1991. This work is supported by Chinese Joint Seismological Science Foundation.     

某碳硅泥岩型铀矿床银的赋存状态研究

本研究采用化学浸取、化学物相、光谱物相、电子探针、扫描电镜和数理统计等方法查明,某碳硅泥岩型铀矿床矿石中的银以自然银独立矿物显微包裹体形式赋存于方铅矿中。根据该铀矿床研究资料,确定矿石中的自然银、含银方铅矿是在300～100℃温度区间,距今65.0～30.7Ma期间形成的。