高级语言与AutoCAD共享地形图图式独立符号库的方法

本文在分析以AutoCAD形文件所建立的《地形图图式》独立符号库结构的基础上，提出了高级语音共享AutoCAD符号库的方法，并对该方法的实现过程作了详细的叙述．作者用TurboC程序设计语言编制了与AutoCAD绘图软件中shape命令具有相同功能的模块．     

面状地图表象的形态研究

形态是分析和研究面状地图表象的重要标志之一。地理现象的形态研究主要是利用地图信息进行。据此，本文提出了研究复杂多样的客体形态的多个量度指标和数学方法，并以实例探讨了形态研究的科学价值和实用价值。     

陕北乡村聚落地理的初步研究

本文分析总结了陕北乡村聚落的位置和集镇分布特征，组织形态和平面形态及五种结构形式。对这些特点的研究将有助于推动陕北乡村聚落的合理化发展。     

An analysis of the factors contributing to the settling potential of fine fluvial sediment

The settling potential of fine sediment is known to be influenced by particle size, shape, density and porosity, and is commonly predicted using Stokes's law, despite its known limitations for modelling the behaviour of natural particles. In order to develop an improved understanding of the potential for fine sediment to settle out of suspension or undergo transport by hydraulic processes, it is important to examine the role of particle structure in detail. In this study, stepwise regression was used to identify which structural properties of particles exert an important control on fine sediment behaviour in river systems. The presence of composite particles and their associated particle size, porosity and fractal dimension were shown to be the most important controls on settling potential. Composite particles that form in the aquatic environment (flocs) were shown to have significantly different form and behaviour from composite particles of terrestrial origin (aggregates). Importantly, it was demonstrated that particle structure and behaviour exhibited consistencies between contrasting river catchments in different locations. An understanding of the mechanisms responsible for the formation of composite particles is viewed as providing a valuable input to efforts to model the mobilisation, transport and fate of fine sediment. Copyright © 2008 John Wiley & Sons, Ltd.     

The effect of particle shape and hydrophobicity in flotation

The effect of particle shape on the flotation process has been investigated in laboratory experiments with monosized spherical ballotini and ground ballotini. The particles were treated by partial methylation with trimethylchlorosilane to achieve varying degrees of hydrophobicity. In flotation, the process of film thinning and liquid drainage is critical in the formation of stable bubble–particle attachments and this is affected by the particle shape and surface hydrophobicity. Flotation tests with different particle sizes were conducted in a modified batch Denver cell. Predictions from a computational fluid dynamic model of the flotation cell that incorporates fundamental aspects of bubble–particle attachment were compared with data from flotation tests. Contact angles of the particles were measured using a capillary rise technique to indicate surface hydrophobicity. Ground ballotini generally has higher flotation rates than spherical ballotini; the results are consistent with effects from faster film thinning and rupture at rough surfaces and are well correlated by the sphericity index.     

神经网络方法识别测井曲线形态

随着油田勘探开发程度的不断提高,要找到有利的油气聚集带以及在开发阶段提高油田采收率,都必须进行储层沉积相分析。这里介绍一种利用自组织神经网络识别曲线形态的方法。采用将测井曲线网格化,再利用自组织神经网络识别曲线形态,进而去判别沉积相。此方法可以对测并曲线形态进行识别,且消除了测井曲线中的不确定因素,运用该方法对实际测井曲线形态的识别基本正确。     

音频电透视仪在铁矿巷道中的试验效果

美国影象有限公司（GeoImage, LLC）开发的“基特\|雷达” （Git\|Radar）软件,既可进行时间域的分析 ,又能直观地在深度域执行反射波振幅或能量的迭加分析.该软件包括一般的二维,三维等绘图支持,且自动化程度较高,普通技术人员经过简单培训即可操作使用.文中给出两个应用实例.     

沙丘风蚀坑的形态及动力过程的研究进展

随着风沙活动对全球变化的响应研究不断深入,沙质海岸、湖岸和半干旱区草原环境中不同程度植被覆盖沙丘及其风蚀坑的动态得到了广泛的重视。本文对沙丘风蚀坑的形态及动力学特征的研究成果作了初步总结,着重阐述了沙丘风蚀坑内气流场、沙粒输移和蚀积变化。最后,提出了沙丘风蚀坑研究巾存在的问题和主要研究趋势。     

不同埋深马兰黄土孔隙结构试验

本文采用"注胶法"制得用以观察分析和定量研究的黄土微观结构试样,借助扫描电子显微镜和数字化图像分析系统,观察并讨论黄土孔隙结构特征及其随黄土埋深增加的变化规律。结果表明,不同埋深马兰黄土依据孔隙率或孔隙面积率分类均属于疏松多孔性土。黄土孔隙连通性随埋深增加逐渐减弱;埋深由小到大,马兰黄土孔隙的主要结构特征由相对不稳定的大、中架空孔隙,过渡为相对稳定的微、小镶嵌孔隙,定量表现为大、中孔隙面积率之和随黄土埋深的增加减小约63.04%,而小孔隙面积率增加约40.57%,微孔隙面积率增加约22.47%。通过对孔隙形状分布的分析,上述不同类型孔隙面积率的增加或减少主要源于细长形和不规则形孔隙面积的改变。此外,不同埋深马兰黄土中细长孔隙的面积在微、小、中、大孔隙的面积中均占主导地位。就孔隙数量而言,马兰黄土中微、小、中、大孔隙的数量随深度增加依次急剧减少,此现象主要由4种孔隙中圆孔数量的显著差异引起,表明圆孔的孔径多偏小。