“99.5,28”沙雅县强冰雹天气过程分析

从天气学角度出发,结合卫星云图演变及层结稳定度特征,分析１９９９年５月２８日发生在沙雅县的强冰雹天气过程,并找出了这次冰雹过程的一些必要条件和指标,同时对该地区冰雹短期、短时预报着眼点方面获得了一些有益启示。     

A FUZZY MATHEMATICS EVALUATION OF THE DISASTER BY TROPICAL CYCLONES

In this paper, data from disaster reduction in China have been used to statistically analy ze the disaster by tropical cyclones that occurred from 1979 to 1996 within the area of Guangdong province. By the method of fuzzy subset theory, the conditions of the disaster have been discussed and the evaluation model of the disaster B set up. The index of the disaster of every tropical cyclone have been obtained and divided into five parts. The result shows that the index is almost proportional to the direct economic losses, so this model is reasonable.     

流体饱和多孔介质波动方程的有限元解法

讨论了流体饱和多孔介质中波传播问题的有限元解法,首先在Ｂｉｏｔ理论的基础 上,概述了数学问题的提法,然后提出了一种新型简便的人工边界上的无反射边界条件,同时 给出了有人工边界时流体饱和多孔介质波动方程的有限元计算公式．数值试验的结果表明, 本文提出的无反射边界条件和数值方法均很有效．     

则木河活动断裂带大震重复间隔

通过对则木河活动断裂带上古地震的研究,讨论该断裂带的大震重复间隔问题,经分析后认为其大震间隔时间为1000年～3000年。     

Characteristics in naturally and experimentally shocked chondrites: A clue to P-T conditions of impacted asteroids

The aim of this study is to compare the experimentally shock-induced features with those in naturally shocked chondrites and to test the feasibility of experimentally calibrating naturally induced features in shocked H- and L-chondrites. Samples of the Jilin chondrite (H5) were experimentally shock-loaded at the following peak pressures: 12, 27, 39, 53, 78, 83, 93 and 133 GPa respectively. Chondritic melts were first obtained at P>78 GPa and more than 60% melting was achieved at P~133 GPa. No high-pressure phases were observed in any of the shocked samples, neither in the deformed nor in the molten regions. Textural relations and mineral assemblages of the shocked samples are comparable to those encountered in the heavily shocked H-chondrite Yanzhuang but differ considerably from those found in heavily shocked L6 chondrites. Shock melt veins in L6 chondrites contain high-pressure polymorphs of olivine and pyroxene and high pressure liquidus phases. Scaling from shock experiments on millimeter-sized samples to natural shock features on kilometer-sized asteroids poses considerable problems in quantifying the P-T conditions during natural shock events on asteroids.     

平果那豆铝土矿矿体产出地质特征及开采技术条件

广西平果岩溶堆积型铝土矿是一种新的工业类型,规模大,埋藏浅,易采易选,矿床地质特征独特,属低硅中铝高铁型。     

民安大厦岩土工程勘察实例分析与评价

基于大量岩土工程勘察资料的分析、整理 ,详细阐述了民安大厦建筑场地地基土的工程性质 ,主要涉及岩性特征、物理力学性质、地震效应及震动液化等方面 ,并对持力层的选择、基坑支护、地基处理等方面进行了工程对策分析 ,所提建议与参数均被设计、施工部门采纳。     

抛物线型屈服面人工冻土蠕变本构模型研究

利用自行研制的W3Z-200型冻土三轴压缩蠕变仪,对淮南地区深表土冻土进行了三轴蠕变试验。根据试验结果,提出以标准黏弹塑性模型为基础,并耦合温度自由度,应用抛物线型屈服准则对模型中的黏塑性项进行改进,建立了新的本构模型来描述高围压复杂应力状态下冻土的蠕变变形特征。基于ADINA有限元软件平台,开发了冻土本构子程序。对淮南某冻结井筒开挖过程进行了数值模拟,计算结果验证了冻土抛物线型黏弹塑本构模型的正确性和合理性。     

复杂地质条件下高层建筑岩石地基承载力取值的探讨

结合一个典型的工程实例,综合分析和比较了室内岩土试验和原位试验结果对岩石地基承载力设计取值的影响。提出在复杂地质条件下按室内岩土试验的结果比按经验取值偏低,以原位试验的试验结果确定地基承载力更为科学、合理。通过原位试验确定地基承载力和变形模量,用原位试验的变形模量计算建筑物的沉降,并与实测值进行比较,两者结果非常一致。     

黄土高原贫困山区经济持续发展战略--以晋西黄土丘陵沟壑区为例

针对晋西黄土丘陵沟壑区的区情特点,在分析预测该区发展机遇和主要产品市场前景的基础上,提出了新时期新形势下的经济可持续发展的方向和重点,同时选出区域的重点产业和重点开发区,相对集中建设,以培植区域增长极,作为开发整治的依托,最后提出贫困山区科技扶贫、信息与联系协作扶贫、融资与项目扶贫等对策思路。其结论为：黄土高原贫困山区可持续发展同时肩负着脱贫致富与生态建设双重重任,须将经济开发与环境整治及科技进步