波动方程辛几何算法三维叠前深度偏移在集群式并行机上的实现

波动方程三维叠前深度偏移研究,已成为近年国内外众多油气勘探科研单位的研究焦点,其关键问题之一是借助于软硬件及其匹配的进步,以求解决计算量庞大的障碍。作者在本文中从油田实际出发,提出了一套并行波动方程辛几何算法三维叠前深度偏移方法与处理流程,运用32节 点集群式并行机,完成了XJWZ地区150km的二维和WJT地区126km^2的三维地震资料波动方程叠前深度偏移处理。其成像的效果,在信噪比、分辨率、深层复杂构造成像等方面均获得了显著改善。     

红色泥岩风化含砾粘土的抗剪强度参数与物理性质相关性研究

研究了巴东组红色泥岩风化含砾粘土的含水量、密度及粘粒含量与内聚力C、摩察角φ的关系。通过配制粒径小于10mm的含砾粘土,按不同的含水量、密度及粘粒含量进行了大量的室内样品实验,分析总结了试验数据的一些规律,得出了适用的经验公式。这些经验公式揭示了该土体的一些特性,同时,当测得土体的某些物性指标后,可以运用这些公式计算该类土体的抗剪强度参数。这样,可避免少量试验数据用于设计时的不可靠性。     

五维Kaluza-Klein理论与各种空间中的Dirac场

导出了 Weitzenbock空间五维 Kaluza-Klein理论中的 Dirac方程 ;对 3种空间Kaluza-Klein理论中的 Dirac方程进行了比较和分析 ;根据理论的简单性要求 ,得出 Kaluza-Klein理论最适用于 Weitzenbock空间的结论     

Rupture process of November 6,1988,Lan-cang-Gengma,Yunnan,China,earthquake of M_s=7.6 using empirical Green’s function de-convolution method

ＲｕｐｔｕｒｅｐｒｏｃｅｓｏｆＮｏｖｅｍｂｅｒ６,１９８８,ＬａｎｃａｎｇＧｅｎｇｍａ,Ｙｕｎｎａｎ,Ｃｈｉｎａ,ｅａｒｔｈｑｕａｋｅｏｆＭｓ＝７．６ｕｓｉｎｇｅｍｐｉｒｉｃａｌＧｒｅｎ’ｓｆｕｎｃｔｉｏｎｄｅｃｏｎｖｏｌｕｔｉｏｎｍｅｔｈｏｄ...     

The empirical relationships between M s, m b and M L for China and vicinity

Data from 753 earthquakes are used to determine a relationship between surface-wave magnitude (M _s) and bodywave magnitude (m _b), and from 541 earthquakes to determine a relationship between surface-wave magnitude (M _s) and local magnitude (M _L) for China and vicinity: M _s=0.9883 m _b-0.0420, M _s=0.9919 M _L-0.1773. The relationship of M _s versus m _b is obtained for 292 events occurred in the Chinese mainland in the time period from 1964 to 1996, 291 events occurred in Taiwan in the time period from 1964 to 1995 and 170 events occurred in the surrounding area. Standard deviation of the fitting is 0.445. Relationship of M _s versus M _L is obtained for 36 events occurred in the Chinese mainland, 293 events occurred in Taiwan, China and 212 events occurred in the surrounding area. The total amount is 541 events. Standard deviation of the fitting is 0.4673. The uncertainties of the converted M _s in different magnitude intervals can be estimated using complementary cumulative distribution function (CCDF). In the relationship of M _s versus m _b, taking ±0.25 as a range of uncertainties, in magnitude interval m _b 4.0–4.9, the probabilities for the converted M _s taken value less than (M _s-0.25) and more than (M _s+0.25) are 17% and 27% respectively. Similarly, we have probabilities for m _b 5.0–5.9 are 34% and 20% and that for m _b 6.0–6.9 are 11% and 47%. In the relationship of M _s versus M _L, if the range of uncertainties is still taken as ±0.25, the corresponding probabilities for magnitude interval M _L 4.0–4.9 are 22% and 38%, for M _L 5.0–5.9 are 20% and 15% and for magnitude interval M _L 6.0–6.9, are 15% and 29%, respectively. The relationships developed in this paper can be used for the conversion of one magnitude scale into another magnitude scales conveniently. The estimation of uncertainties described in this paper is more accurate and more objective than the usual estimation expressed by deviation. The estimations described in this paper indicate various dispersions in different magnitude intervals of original data. The estimations of uncertainties described by probabilities can be well connected with the total estimations of uncertainties in seismic hazard assessment.     

河道非平稳流的内摩阻损失

洪水波在运动中不变形,则没有内摩阻损失,即所谓运动波。波体在传统途中变形,则有加速项或惯性力,内摩阻力等于惯性力。动量没有内摩阻损失,能量有内耗,故在非平稳流情况下,动量方程要比能量方程多一项惯性波。     

利用GIS实现区化扫面采样点地质代码自动识别

本文主要介绍利用ＧＩＳ对地质图进行数字化采集和编辑,填写每个区的地质属性信息,将区化扫面中涉及的采样点与区进行拓扑分析,从而完成采样点地质代码的自动填写。并介绍了处理过程中的技术难点,为今后化探扫面中地质代码的填写提供了新的方法。     

潜在腾发量的随机过程特性探讨—— 一个实例研究

利用中国科学院禹城试验站的系列气象观测资料计算了逐日潜在腾发量(ETP).将日潜在腾发量系列分解为均值项和随机项两个部分,利用标准差对随机项进行了标准化处理.而后着重研究了标准化以后的随机序列的随机过程特征.首先,建立了该系列的离散的时间序列模型,然后在此基础上建立了相应的连续参数的随机模型,取得了该序列的理论概率分布密度和稳态概率分布密度,并得到了观测结果的验证,同时,还得到了该序列的自相关函数和谱密度函数的解析表达式,从而比较全面地分析了腾发量系列的随机过程特性.     

地下水环境中污染物迁移预测实验数学模型基本方程探讨

本文以钴为研究对象,运用相似理论,探讨采用黑箱功能模拟方法、通过模拟实验来建立地下水中污染物迁移预测的实验数学模型的基本方程。     

Statistical Properties of Ideal Rock Textures: Relationship Between Crystal Size Distribution and Spatial Correlation of Minerals

The concept of an ideal rock texture, in which crystals are distributed randomly in space, is proposed for use in general analysis of rock textures. The spatial correlation function for the ideal rock texture was examined and the function, a specific kind of spatial correlation function, is related to crystal size distribution and to some extent to crystal boundaries. The function is unity at distance zero, and monotonically decreases with increasing distance for the ideal texture. This behavior of the function is observed for any size distribution. In an ideal texture, the function is directly related to crystal size distribution and crystal shape. It is important in stereology because the crystal size distribution in three dimensions may be deduced from analyzing a function that is obtained from analyzing two-dimensional section images. Crystal shape is also related to the function. If crystals are concave in shape, or have inclusions of other phases, the function may show a hump or plateau when plotted against distance. However, the crystal shape effect cannot produce values smaller than zero. If values become negative, the texture is no longer considered ideal. The ideal textures for two model size distributions—step and delta functions—are considered. The rate of decrease of values is more strongly dependent on size distribution than on system dimension.