金刚石包裹体中的古地幔信息

金刚石在地幔环境生长过程中会捕获一些包裹体，这些包裹体能够被金刚石携带到地球表层，金刚石包裹体保存有其生长时古地幔环境的信息，通过对这些包裹体的研究，,可以获取古地幔环境的信息，阐述了金铡石包裹体的特征，综述了金刚石包裹体在获取古地幔物理化学环境，相环境以及地幔信息方面的取得的一些成果。     

伸展区域平衡剖面法及其在构造分析中的应用

从伸展构造样式出发,针对不同的地质模型提出了不同的数学模型作为平衡剖面恢复实现的基础。“多米诺”骨牌模型采用刚体平移,旋转实现恢复,伸展断层转折褶皱模型采用剪切法恢复,也有用等岩层长度法作构造恢复。通过淮阜凹陷实际地质剖面的恢复,数学模型以正演,反演两种角度便捷的实现构造平衡,恢复控凹断层发育期次,通过各期伸展量和伸展速率的计算定量分析的盆地构造。     

鄂尔多斯盆地燕山运动及其与油气关系

鄂尔多斯盆地是中国中西部重要的含油气盆地之一。燕山期是盆地油气运移和聚集的主要时期。通过晚中生代及其周缘地区沉积格局、构造变形、晚侏罗世—早白垩世的岩浆及热事件的分析 ,认为晚侏罗世以前盆地主要受特提斯构造域的控制 ,古太平洋板块对盆地格局的影响在晚侏罗世晚期以后才有所表现。深部地幔蠕散是盆地古地温场变化的主要原因。它不但导致了盆地地温梯度的急剧升高 ,而且还对后期盆地周缘的地壳浅层次构造变形有一定的影响 ,也是造成晚中生代山西地区与鄂尔多斯盆地差异的重要因素 ,还对油气的运移和聚集起着控制作用。综合燕山期盆地古应力场、古地温场及构造变形特点 ,可以认为燕山期构造运动对鄂尔多斯盆地的油气分布至关重要     

前陆盆地类型及其沉积动力学研究综述

从前陆盆地的特点及类型入手,综述了前陆盆地研究的热点内容,最新方法及其沉积动力学进展状况,揭示了前陆背景下盆地充填序列的构成及内部演化特征,指出了盆地的沉积－地层格架与冲断造山带的幕式活动之间的响应关系。     

超大面积深厚软土桩-网复合地基承载性状模型试验研究

基于厦深铁路潮汕车站地基处理加固工程,完全参照原型的软土地基地层分布情况,设计了两种不同桩间距下的超大面积深厚软土桩-网复合地基物理模型试验,对荷载传递机制与不同桩间距下桩体荷载分担比、桩土应力比及地基沉降规律等进行了系统研究。结果表明,桩身轴力沿着桩身高度往下先逐渐增大到某一深度后又逐渐减小,随着桩间距增大,桩承担上部荷载的方式由摩擦桩逐渐向端承桩变化;随着桩间距增大,桩身中性点下移,桩身最大负摩阻力出现的位置下降,且其值减小;桩间距对桩-土应力比有显著影响,而对桩体荷载分担比影响较小;不同桩间距下,两桩中心桩间土与桩顶差异沉降均小于4桩中心桩间土与桩顶差异沉降;随着路堤填土荷载增加,土工格栅表现为拉应变逐渐增大,拉应变曲线刚开始比较平缓,后逐渐变陡,增大的速率先慢后快。     

Mixture of populations

A simple example simulating a mixture of two normal populations results in some important observations, nonnormality and nonsymmetry of the mixture conditional pdf, nonlinearity of the conditional mean as a function of the conditioning data, heteroscedasticity of the conditional variance and its nonmonotonicity as a function of distance of the unknown to the conditioning data. A comparison of the mixture statistics with those predicted by traditional models ignoring the mixture reveals the inadequacy and inappropriateness of these traditional approaches. A mixture of two multivariate normal populations is illustrated through the analytical expressions of its conditional distribution and moments.     

New Attempt to Reduce the Harm of Smoking: Reducing the Nitrosamines Level in Tobacco Smoke by Microwave Irradiation

In order to protect the environment and public health, microwave irradiation was investigated as a means of reducing the nitrosamines level of tobacco smoke under mild conditions where the microwave energy was 1 kW and the irradiation time was shorter than 2 min. The microwave‐induced elimination of nitrosamines such as N‐nitrosopyrrolidine (NPYR) and N‐nitrosodiphenylamine (NDPA) was investigated and the impact of the presence of water and salt in the medium on the reduction was assessed in detail. The existence of water in the medium was crucial for the microwave‐induced reduction of NDPA, because the rapid movement of water molecules under the influence of microwaves strongly affects the adjacent nitrosamines leading to their decomposition. This was the first time that microwaves have been used to directly irradiate cigarettes sealed in their packaging, and the nitrosamines content of tobacco and smoke of these irradiated cigarettes were analyzed with care. Irradiation for 90 s with microwave energy of 1kW was seen to reduce 25 to 30% of the nitrosamines in tobacco and 50 to 60% of the levels present in the mainstream smoke of the cigarette. Moreover, lower mutagenic activity and higher CHO cell livability were found for the irradiated cigarettes in comparison with the control according to the results of in vitro tests.     

基于MATLAB的工程物探软件快速开发

针对当前国内工程物探软件开发滞缓的现状,提出基于MATLAB语言快速开发工程软件．分析讨论了其必要性和可行性,详细介绍了MATLAB开发应用程序的基本思路,并给出了工程实例和经验总结．     

Horizontal vibrations of a disk on a poroelastic half-space

This paper analytically examines the horizontal vibration of a rigid disk on a saturated poroelastic half-space. The pressure-solid displacement form of the harmonic equations of motion for asymmetric dynamic problem are developed from the form of the equations originally presented by Biot. Making use of a new method the solution of the above equations is obtained. According to the mixed boundary -value conditions, the dual integral equations of the horizontal vibration of a rigid disk on a saturated poroelastic half-space are established. By appropriate transforms, it is shown that the dual integral equations can be reduced to a pair of Fredholm integral equations of the second kind, whose solutions are then computed. Numerical results for the horizontal dynamic compliance coefficient are given at the end of this paper.     

基于Exchange Server 5.0前兆网络邮件系统的建立

各省地震局 95 - 0 1- 0 2地震信息网络项目采用的邮件系统是基于 IRIX 6 .5操作系统的Netscape Mail Server2 .0 ,由于其应用与管理有局限性 ,笔者进行了基于 NT系统的 ExchangeServer5 .0邮件系统的应用研究 ,详细论述了基于 Exchange Server5 .0的黑龙江省地震前兆信息网络邮件系统的安装及配置过程 ,得出该网络邮件系统有管理方便、功能强大的结论