圆弧滑动边坡改进条分法的数值分析

结合传统极限平衡方法和现代极限平衡方法,对圆弧滑动边坡进行垂直条分,将条块间的作用力一般化,提出了基于圆弧滑动的改进条分法。建立了圆弧滑动边坡的力学计算式,确定了一般化的条间力影响系数和边坡安全系数的关系式。运用数值计算和迭代程序,得出滑体分别在力平衡和力矩平衡下的安全系数随条间力影响系数变化情况,从而定量地描述了边坡稳定状态。结果表明,圆弧滑动垂直条分改进方法反映了滑动面和垂直面相互影响情况,数值计算简便,而且精度较高。     

长江口岸带经济圈地质工作及其服务领域拓展

结合岸带经济圈的发展趋势,探讨了长江口地区地质工作及其服务领域开拓的若干方面。     

Determination of stellar positions with a cross-correlation procedure

A technique of cross-correlation for the determination of stellar positions is proposed. It is a technique suitable for the recording of stellar positions on transit instruments, photoelectric astrolabes, and also on the meridian circles with reversed observing method. An advantage of this process is that there is no hypothesis required for the modelling image profile, and for the noise. It is closer to unbiased estimation. Results by this new method on a transit instrument are presented. For the brighter stars, there is no great difference in accuracy between the median position and the cross-correlation value according to the results.     

角度后方交会的最优构形

本文基于普通测量网优化设计理论，详细讨论了角度后方交会的最优定位问题，通过理论推证，解决了在给定三个已知点的前提下，如何选择最优待定点的问题，从而给出了后方交会的最优构形，本文所得结论不仅解决了测量理论上的一个基本问题，而且对实际工作应也有指导作用。     

莫尔圆法表征坐标中误差特性几何意义的探讨

阐述用方差协方差数据绘制莫尔圆，以及用莫尔圆表示点位误差椭圆各元素的方法。对用莫尔圆表征坐标中误差特性的几何意义作了探讨，取得了概念清楚、直观的效果。     

气象变化与邢台地震关系初探

本对刑台地震活动与气象的关系进行了分析研究，认为刑台除１９６６年３月大震前有明显的气象异常，大震后的中强余震亦有气象异常，此外，还发现低气压对强震，余震活动均有显影响，经分析，我们认为低气压天气过程对地震活动有不可忽略的触发作用。     

地理信息获取与处理技术的发展与应用

从分析外业数据采集、内业数据处理、测绘产品的发展入手，讨论了地理信息获取与处理技术的进步及带来的变化。     

A response‐spectrum‐based envelope for Mohr's circle

Mohr's circle is commonly used to determine the combinations of normal and shear stresses that act in any direction at a location of interest within a structure. During an earthquake, the radius and center of Mohr's circle naturally fluctuate with time. In such cases, an envelope that bounds the time‐varying realizations of Mohr's circle at a given location is desirable to facilitate the identification of critical combinations of normal and shear stresses at that location. In this paper, a response‐spectrum‐based procedure for predicting the envelope that bounds Mohr's circle in a linear‐elastic structure subjected to seismic loads is developed. The accuracy of the proposed envelope is evaluated by comparing it to the results of time‐history analyses performed on a concrete gravity dam using simulated and recorded ground motions. It is found that the proposed envelope has a level of accuracy that is commensurate with its response spectrum bases. The largest observed difference between the simulated and predicted envelopes is less than 10%. Copyright © 2003 John Wiley & Sons, Ltd.     

北秦岭构造带（河南段）金、铜遥感地质综合找矿模式研究

根据TM、SPOT等遥感图像影像特征，综合北秦岭构造带（河南段）地质特点，分析了北秦岭构造带（河南段）的线性影像和环形影像特征，探讨了其对金、铜矿的控制作用。在总结成矿规律的基础上，建立了以线性、环形构造网络为主体的遥感地质综合找矿模式。     

大地电磁阻抗张量不变量及其Mohr圆分析

论述了Ｍｏｈｒ圆及其在大地电磁阻抗张量分析中的应用。并指出，大地电磁阻抗张量不变量由于提供信息的多样性和稳定性，在应用中具有独特的优点，而Ｍｏｈｒ圆又将各种大地电磁阻抗张量不变量有机地联系在一起，使其成为分析研究大地电磁阻抗张量性质的重要图示工具，能直观、清晰、简便地给出构造维数、二维偏离度、各向异性等重要信息，可用来研究测区电性结构沿纵向和横向的变化特征