Interaction of fluid dynamic factors in the migration and accumulation of natural gas

The migration of fluid petroleum gas, described as fluid potential, depends only on gravity, fluid pressure controlled by depression and capillary force during tectonically stable period; but on tectonic stress during the tectonically active period with severe compression. This method is applied in the Junggar Basin, showing that the migration of Jurassic gas during Cretaceous and Eocene and the migration of Permian gas from Jurassic till the present are determined by capillary force and fluid pressure (including overpressure) which is controlled by depression; the migration of Jurassic gas from Eocene till the present and the migration of Permian gas during Triassic are controlled by tectonic stress.     

虚拟内窥镜中心路径抽取技术

目的在空腔器官中提取一条最佳的用于虚拟内窥镜漫游的中心路径。方法采用基于距离变换的方法进行路径抽取。结果给出了虚拟内窥镜中心路径的定义，总结了中心路径的基本特性。结论在虚拟人脑内窥镜系统中实现了中心路径的提取，用于器官内窥检查，效果良好。     

基于三维人体测量的参数化人台的研究

为了提高服装的合体性，在对三维人体测量结果统计分析的基础上，提出了参数化人台设计技术路线．在VC＋＋．net单文档视图模式下调用OpenGL，通过多边形曲面造型方法实现了可用按钮和键盘来控制的参数化人台设计．结果生成了反映人体特征的标准系列人台和个性化人台，用于三维服装CAD和服装人台的制作。     

浅析验证码在B/S系统安全性中的应用

本文分析了验证码B／S系统安全性中的关键作用，介绍了验证码的类型，探讨了验证码在B／S系统安全性中的具体应用。     

Rough set-based feature selection method

A new feature selection method is proposed based on the discern matrix in rough set in this paper. The main idea of this method is that the most effective feature, if used for classification, can distinguish the most number of samples belonging to different classes. Experiments are performed using this method to select relevant features for artificial datasets and real-world datasets. Results show that the selection method proposed can correctly select all the relevant features of artificial datasets and drastically reduce the number of features at the same time. In addition, when this method is used for the selection of classification features of real-world underwater targets,the number of classification features after selection drops to 20% of the original feature set, and the classification accuracy increases about 6% using dataset after feature selection.     

Histological observation of some primitive euconodonts of Late Cambrian from Liaoning

The histology of some euconodonts of Late Cambrian from Benxi and Fuxian County, Liaoning Province is studied by the oil-immersion technique. The histological characteristics of six primitive species of euconodonts - Proconodontus muelleri， Proconodontus tenuiserratus， Granatodontus ani， Rotundoconus tricarinatus， Teridontus nakamurai and Cordylodus proavus are described in detail. Tubular dentine and atubular (parallel- and wavy-lamellar) dentine are found in the basal bodies of the primitive euconodonts Proconodontus tenuiserratus and Proconodontus muelleri, respectively. The tubular dentine and spherulitic dentine are also recognized from the basal bodies of Granatodontus ani and Rotundoconus tricarinatus. Since the histological characteristics of the studied six species of euconodonts belonging to Proconodontus lineage and Teridontus lineage Sensu Miller (Univ Kansas Paleontol Contr, 1980, 99: 1?39) seems to be almost the same, euconodonts are proposed as possibly monophyletic herein.     

慢性粒细胞白血病先后急性变M_(2a),M_(2b)例

目的　追踪观察患者慢性粒细胞白血病(CML)双重急性变(M2a,M2b)的诊断及治疗过程,以期对慢粒急变有更深入的了解.方法　对患者整个病程给予追踪记录.结果与结论　通过对患者病程的诊断、治疗和观察,进一步研究和探讨慢性粒细胞白血病急性变机制及基因、染色体的结构变化.     

锗量子点超晶格的光学特性

对自组装生长的Ge量子点超晶格样品进行了光荧光谱(PL谱)和拉曼散射谱(Raman谱)实验测量研究．对Si的TO发光峰和Ge的发光峰特征进行了深入讨论，通过对变温PL谱的拟合及分析提出了对Ge量子点尺寸和其电子有效质量一种新的测评方法；首次在非共振Raman模式下观测到低频声子模，研究了样品的结构组份、应变及声子限制效应问的关联性．     

基于产品局部特征分析的造型设计方法

探讨了产品局部特征分析的新算法,具有良好的全局重构能力,重视产品的局部特征,为产品局部特征分析提供了更深更广意义的理解,为产品设计反求工程提供一种新的形态重构方法,为产品局部造型深入设计提供依据.