“Small earthquake modulation window” and its applications in medium－term prediction

“Ｓｍａｌｌｅａｒｔｈｑｕａｋｅｍｏｄｕｌａｔｉｏｎｗｉｎｄｏｗ”ａｎｄ　ｉｔｓａｐｐｌｉｃａｔｉｏｎｓｉｎｍｅｄｉｕｍ－ｔｅｒｍ　ｐｒｅｄｉｃｔｉｏｎＬｕａｎ－ＳｈｅｎｇＳＵ（苏鸾声）（ＳｅｉｓｍｏｌｏｇｉｃａｌＢｕｒｅａｕｏｆＳｈａｎｄｏｎｇＰｒ...     

Global positioning system: An effective way to map a small area or catchment

The Global Positioning System (GPS) is an established method for establishing high accuracy horizontal and vertical control points over large areas. Recent improvements in receiver technology, differential surveying and software have made the use of GPS technology more practical for smaller projects. This paper compares different GPS methods with occupation times of 2 s, 2 min and 12 min using an existing control network, and the gathering of topographic data from a difficult field site. Two examples are given, one in East Texas, demonstrating the speed and accuracy of different techniques, and the other in the Quantock Hills in Somerset.     

松辽盆地英台地区构造特征与油气聚集关系的研究

利用钻井、地质和地震等资料、通过构造发育史研究，认为本区构造特征为在东倾的斜坡背景上，东西分带，南北分区的区域构造格局；断层呈“Ｓ”形展布，同生小构造发育，自西向东可分为４个不同类型的圈闭带，结合本区已证实的含油层位，预测了相应油气藏的分布。     

绕射波在坑道中超前探测小构造的应用

本文阐述了应用绕射波探测坑道掌子面前方小构造的技术,在速度低于上下围岩的中等速度的特定层位中,地震波将在前方的小断层或小构造处反射,以绕射波形式返回到检波器,其最远的探测距离达184m。     

软岩弹性模量的测定与讨论

本文首先介绍一种岩土自动化精密三轴压缩试验系统,并以此试验系统所得的一组实验结果为例,揭示软岩在微小应变(ε_1=10~(-2)—10~(-5))条件下所反应的应力-应变的线性关系,以及根据软岩在弹性范围内所测得的数据求出弹性模量。本文结合以往的研究成果,对软岩的弹性模量及变形系数开展分析和讨论。最后,本文将实验结果与现场测试结果相比较,从中了解两者之间的关系。     

晚期小岩体归宿及其在找矿中的意义初探

本文提出了晚期小岩体不是花岗岩浆演化的产物,而是相当于超浅成的次火山岩。由于它与铀成矿关系密切,因而花岗岩型铀矿与火山岩型铀矿成矿机理相同。对比火山岩中两大系列铀矿,即与次火山岩有关的早期铀矿和与红盆发生发展有关的晚期铀矿,认为花岗岩中也应有相应的两期铀矿。今后找富矿、找深部矿时应注意寻找早期铀矿。同时根据花岗岩中面型蚀变体的存在,推论在面型火山岩铀矿深部应寻找次火山岩型铀矿。     

Measuring Demographic Change: The Split Tract Problem

Census tracts in rapidly growing areas often are split into two or more tracts between decennial censuses. The mismatch of tract boundaries between decades poses difficult problems for those researchers interested in measuring demographic change in small areas. The most common solution is to make tracts in both years conform to the earlier boundaries-data from the split tracts are aggregated. An alternative is to apportion data for the earlier year on the basis of land area. A third method estimates the distribution of data for the earlier year by the proportion of population later living in the various split tracts. Comparison of these three methods suggests that, in typical situations, the latter method results in less overall error.     

普查小型矿床时的研究程度问题初议

小型矿床开发利用在我国矿业中占有十分重要的地位。但小型矿床一般只经过普查工作，研究程度低。如何利用普查资料进行小型矿山建设，又不致造成大的失误？这是一个十分现实的问题，本文对其进行了初步探讨。     

小流域水土保持效益的灰色预测分析：以鹿马岔实验区为例

水土保持效益指标是一个多目标、多因素的动态灰色控制系统，其时间序列的动态变化可以用灰色控制理论中的灰色模型进行定理分析与预测。根据对鹿马岔小流域产业结构和经济潜力的分析，其预测值是可信的，从而证明了灰色系统理论是小流域水土保持综合治理效益预测实现模型化、定量化的有效方法之一。