地下连续墙施工中几种接头形式的对比分析及应用

随着地下连续墙的应用越来越多,地下连续墙的接头形式也在不断地发生变化。结合工程实践,对常用的几种地下连续墙接头形式进行对比分析,阐述了不同形式接头的优缺点及适用范围,为工程设计施工提供借鉴。     

DYNAMICAYOUT ADJUSTMENT AND NAVIGATION FOR ENTERPRISE GIS BASED ON OBJECT MARK RECOGNITION

In this paper a new method is developed to make a dynamic layout adjustemnt and navigation for enter-prise Geographic Information System(GIS) based on object mark recognition.The extraction of object mark images is based on some morphological structural patterns,which are described by morphological structural points,contour prolpety,and other geometrical data in a binary image of enterprise geographic information map.Some pre-processing methods,contour smooth following,linearization and extraction patterns of structural points,are introduced If any special object is selected to make a decision is a GIS map ,the all information around it will be obtained.That is ,we need to investigate similar object enterprises around selected region to analyse whether it is necessary for establishing the object enterprise at that place.To further navigate GIS map,we need to move from one region to another,Each time a region is formed and displayed based on the user‘s focus,If a focus point of a map is selected,in terms of extracted object mark image,a dynamic layout and navigation diagram is constructed.When the user changes the focus (I.e.click a node in the navigation mode),a new sub-diagram is formed by dropping old nodes and adding new nodes,The prototype system provides effective interfaces that support GIS image navigation,detailed local image/map viewing,and enterprise information browsing.     

Geometrical Properties of Galaxy Clusters

Empirical and analytical procedures are developed to determine the morphological properties of galaxy clusters. The apparent orientations and shapes are obtainted in two dimensional space while the direction towards the cluster pole is found in three dimensional space. These properties were determined for three Abell clusters and found to be strongly related. This revised version was published online in July 2006 with corrections to the Cover Date.     

地壳波浪运动机制探讨

讨论了地壳波浪运动形成的机制及其效应 ,并为地壳波浪状镶嵌构造学说提供了初步的数理模型和理论依据。     

Study and suppression of anomalous fast events in inorganic scintillators for dark matter searches

The status of dark matter searches with inorganic scintillator detectors at Boulby mine is reviewed and the results of tests with a CsI(Tl) crystal are presented. The objectives of the latter experiment were to study anomalous fast events previously observed and to identify ways to remove this background. Clear indications were found that these events were due to surface contamination of crystals by alphas, probably from radon decay. A new array of unencapsulated NaI(Tl) crystals immersed either in liquid paraffin or pure nitrogen atmosphere is under construction at Boulby. Such an approach allows complete control of the surface of the crystals and the ability to remove any surface contamination. First data from the unencapsulated NaI(Tl) do not show the presence of anomalous fast events.     

The Stability of the Light Curve of DL Cassiopeiae Between 1959–1997

A variability survey on the shape of the light curve of the classical Cepheid DL Cas has been performed on the basis of Johnson V photometry data covering about 38 years. The input parameters (mean magnitude, pulsation frequency and period, light curve amplitude, harmonics amplitudes, Fourier type structural parameters) for our study were determined through the Fourier decomposition technique applied to each data set. The analysis of the outcoming time series, using different and complementary methods, seems to indicate the constancy of these parameters within the precision limits of the available data, although the hypothesis of the presence of a low level variability cannot be excluded. The only exception is the pulsation period, which displays a possible increasing trend with a rate of 0.109 ± 0.037 s yr⁻¹. This trend may be, at least partly, an effect of the unequal precision of pulsation period estimated values, corresponding to each considered data set. This revised version was published online in July 2006 with corrections to the Cover Date.     

顾及分支三角网形状因子的面状目标主骨架线提取

针对传统主骨架线提取算法考虑因素单一、计算复杂、运算耗时等不足,综合三角网中目标的走向、分布及位置等面状目标因素定义了分支三角形形状因子,提出顾及多因素的分支三角形形状因子的主骨架线提取算法。文中阐述了该算法的基本思想、关键量论,采用编程语言进行算法的实现,并结合实验结果分析算法的特点及优势。     

基于GML从DXF文件到Shape文件格式转换的研究与开发

由于AutoCAD系统与GIS系统在数据结构上存在着较大的差异,这使得其数据往往不能很好地满足GIS的要求。本文在分析目前AutoCAD数据到GIS数据转换存在问题的基础上,利用GML提出一种新的数据格式转化方法,解决了GIS系统与AutoCAD系统之间的数据共享问题。并通过实践证明,该方法可以真正实现数据的无损转换。     

An efficient approach to generating DEM samples having coincident void ratios with actual sand

The ranges of initial void ratios that can be achieved for numerical samples with the same grading as actual sand under gravity are explored using three-dimensional discrete element method (DEM). A corrected compressible accumulation model is proposed to predict the packing density of sand. Compared with the measured results, the errors of the prediction results are small. For three-dimensional DEM samples, when the ratio of sample size to particle size L/R is equal to or larger than 30, the maximum and the minimum void ratios are minimally affected by the sample size L. The maximum void ratios and the minimum void ratios of numerical samples with spherical particles are much smaller than those of actual sands. The generation method for numerical samples with non-spherical particles is proposed based on the theory of CPM. The variations of void ratios of numerical samples with non-spherical particles are wider than actual sands. So it can meet all the need of DEM simulation on the void ratio of actual sand.