小浪底工程的测量监理实践

黄河小浪底水利枢纽工程采用国际招标建设，工程建设全面推行业主负责制、招标投标制、建设监理制，工程建设管理全方位与国际接轨。通过小浪底工程测量监理的实践，阐述了在FIDIC合同条件下的测量监理的主要任务、监理方法，总结了采用的测量新技术。     

RC框架节点的弯矩-滑移转角恢复力模型

本文提出了框架结构梁端纵向受力钢筋在节点中锚固滑移所产生的附加转角的简化计算模型，并在梁柱组合件试验所获得的杆端弯矩—滑移转角滞回曲线基础上建立了杆端弯矩—附加滑移转角恢复力模型。该恢复力模型包括一条基于计算的双线型骨架曲线和一系列基于试验现象的滞回规则。计算结果与试验结果的比较表明，本文提出的杆端弯矩—附加滑移转角恢复力模型可以较好地反映试件的滞回性能，可供框架结构弹塑性地震反应分析时参考。     

A GIS-Based Multivariate Statistical Analysis for Shallow Landslide Susceptibility Mapping in La Pobla de Lillet Area (Eastern Pyrenees,Spain)

This paper presents a GIS-aided procedure for shallow landslide susceptibility mapping at a regional scale. Most of the input data for the susceptibility assessment have been captured automatically. A total of 13 parameters, related to the slope geometry, have been derived from the digital elevation model (DEM) while vegetation cover and thickness of superficial formations have been obtained from photointerpretation and field work. The susceptibility assessment is based on multivariate statistical techniques (discriminant analysis), which hasbeen tested in a pilot area in La Pobla de Lillet (Eastern Pyreenes, Spain). Theresults obtained using a random sample show that 82% of all the cells, and 90% of cells including slope failures, have been properly classified. A susceptibility map based on the discriminant function has given consistent results. The susceptibilityassessment is very sensitive to the parameters selected. Compared to thetraditional methods, the main advantage of the GIS-aided procedure is the rapidityprovided by the automatic capture of parameters. It also has the capability of coveringlarge areas, and the objectivity and reproducibility of the results. The main drawbackis that, at present, not all regions have DEM accurate enough to cope with small landslides.     

Statistical Evaluation of Compositional Differences Between Upper Eocene Impact Ejecta Layers

Melt droplets formed by the impact of a large meteorite impact event(s) have been found in upper Eocene marine sediments from the Atlantic, Pacific, and Indian oceans. The number of discreet impacts that occurred to form these melt droplets can be gleaned by compositionally analysing the droplets and establishing the number of distinct groups. Previous studies have inferred two, three, or more source impact events, although we believe the statistical techniques used to distinguish the groupings are open to criticism. Multivariate and univariate analysis (including discriminant analysis) of the major-element composition of an increased data set of impact melt ejecta droplets have been performed. The results demonstrate that the uppermost ejecta layer is geochemically distinct from other late Eocene melt ejecta. Our statistical analysis suggests two underlying, purportedly stratigraphically separate ejecta layers, possess minimal differences that cannot be distinguished clearly from one another by discriminant analysis, which adds to the plausibility that they have a common source. Finally, our results reveal apparent disparities between the new major-element data from this study and data compiled from existing sources.     

Enviromental genotoxicity evaluation: Bayesian approach for a mixture statistical model

 The data analyzed in this paper are part of the results described in Bueno et al. (2000). Three cytogenetics endpoints were analyzed in three populations of a species of wild rodent – Akodon montensis – living in an industrial, an agricultural, and a preservation area at the Itajaí Valley, State of Santa Catarina, Brazil. The polychromatic/normochromatic ratio, the mitotic index, and the frequency of micronucleated polychromatic erythrocites were used in an attempt to establish a genotoxic profile of each area. It was assumed that the three populations were in the same conditions with respect to the influence of confounding factors such as animal age, health, nutrition status, presence of pathogens, and intra- and inter-populational genetic variability. Therefore, any differences found in the endpoints analyzed could be attributed to the external agents present in each area. The statistical models used in this paper are mixtures of negative-binomials and Poisson variables. The Poisson variables are used as approximations of binomials for rare events. The mixing distributions are beta densities. The statistical analyzes are under the bayesian perspective, as opposed to the frequentist ones often considered in the literature, as for instance in Bueno et al. (2000).     

对混凝土预制桩接桩问题的测试及处理方法

用低应变动测、高应变动测及静载荷测试等多种方法对混凝土预制桩进行测试，诊断混凝土预制桩接桩问题，进而指出了对该问题的处理方法。     

节理等密图的计算机化

用VB6语言进行节理等密图绘制编程，可以提高构造研究的效率和数据的精度。程序首先对节理产状进行转换得到施密特网中的直角坐标，再投图得到节理极密图；其次，对转换的坐标数据进行统计后可作出节理等值线图；最后，程序可自动确定出节理分布的多个优势中心。     

中外油气资源评价方式差异的探讨

石油工程师学会（SPE）、世界石油大会（WPC）和美国石油学家协会（AAPG）于2002年联合推出的新的油气资源分类体系,与中国的分类有较大差别。中外储量和资源评价最根本的区别是中国强调系统研究,相对不注重资源的经济性,缺乏动态管理,储量分类体制上沿用前苏联的模式,勘探、开发相互分离,地质评价注重成因法等诸多方面。储量计算和结果表达方式大多用确定性法而非概率法,不利于对项目进行风险和投资组合管理。     

测井和地震联合解释CCSD先导孔反射体

利用声波、密度、自然伽玛等测井曲线资料、配合录井资料划分CCSD先导孔变质岩岩性, 然后, 用声波、密度计算波阻抗, 与井旁VSP资料对比, 分析CCSD先导孔孔区反射体.分析结果表明(1) 岩性间波阻抗差异产生反射波, 如榴辉岩与副片麻岩之间波阻抗差异; 榴辉岩与超基性蛇纹岩之间的波阻抗差异等; (2) 破碎特别是韧性剪切带产生反射波, 而如果断层破碎带尺度很小(在1m以下), 也不一定能产生强反射波.这些研究结果对标定地壳中的反射地震信号具有重要意义.