中国现代地质钻探技术          下载免费PDF全文

耿瑞伦 《探矿工程》1996,(4):20-22

中国幅吊辽阔，矿产富饶。中国钻探历史悠久。４０余年来中国地质钻探在矿产、能源与水资源勘查以及工程勘察与建设中作出了卓越贡献。中国现代地质钻探技术正步入世界先进行列，其应用领域日益宽广。  相似文献   

A PRELIMINARY STUDY ON THE VARIATION FEATURES OF GRAIN YIELD OF CHINA IN RECENT 40 YEARS     

Zhang Yu 《地理学报(英文版)》1996,(2)

ThespatialdistriblltionofcropcultivatedinChina,especiallyofcroptyPes,vanetiesandcroppingsystems,lspnnclpallydeterm1nedbyclimaticcondltions,andarelatlvestableconcentratedroponaldistributionpattemhasbeenformedinrecat4Oyears.Temporally,cropWeldshowsanincrementaltrendandanoscillationpattenlonlargeandmesialtimescalesbecauseoftheianuenceofagnculturaltechnologyandsoclalfaCtors,respeCtively.ThesharPvariationofaghculturalproduCtsinquantityandqualityfromyeartoyearispnnc1pallycausedbyclimate.This,onth…  相似文献   

生态经济型防风治沙体系优化配置技术规程研究   总被引：4，自引：1，他引：4  

王辉  刘千枝 《中国沙漠》1996,16(4):368-373

通过对景电灌区农林业生产状况、自然环境条件、以及风沙危害程度的实地调查，应用系统工程学和生态经济学原理，研究提出：景电灌区防风治沙工作应该走系统工程和生态经济相结合的道路，以封沙育林草为主导措施发展沙区自然植被系统，进一步建立和健全工程治沙系统，并营造和发展人工生态经济型林草植被系统。通过这三大子系统的合理搭配和联合交互作用，使新灌区形成新型的生态经济型防风治沙体系。文章就该体系的合理配置问题及建设技术规程进行了论述  相似文献   

面向对象的时空数据模型   总被引：3，自引：0，他引：3  

舒红  陈军  杜道生  周勇前 《武汉大学学报(信息科学版)》1997,(3)

从存储管理和时空语义表现角度给出了时空数据模型的基本设计思想。同时，从时空对象类型及其数据结构、时空操作方面定义了一个面向对象时空数据模型的逻辑结构。  相似文献   

The World Wide Web and university education in remote sensing   总被引：1，自引：0，他引：1  

Erik Stubkjær 《ISPRS Journal of Photogrammetry and Remote Sensing》1997,52(6):281-293

The World Wide Web (YAW) has a potential for improving university education in remote sensing, as the WWW technology may be applied in a way which reduces the amount of resources which are needed to achieve a certain educational objective. The paper presents a survey of this new technology. The main components of the WWW technology are outlined. Reference is made to information resources which are available through the WWW which relates to remote sensing. The technology can be applied not only by individual staff members, but, also, according to decision at the departmental or faculty level. The use of information technology for education is a research field in its own right. This research field is presented as a basis for suggestion of decision issues and decision criteria regarding the use of the WWW for education in remote sensing. The paper may have an European bias.  相似文献   

遥感技术在内蒙古苏尼特左旗1：5万区调中的应用     

于学政  李述靖 《现代地质》1995,9(2):254-260

本文阐述了遥感技术应用于内蒙古苏尼特左旗１：５万区域地质调查工作中的任务、工作程序、工作方法与内容，介绍了遥感解译程度划分方案、解译分区依据及野外路线配置布署意见，以及微机图像和图形处理、人机对话解译、机助制图在１：５万区调中的作用，总结了遥感技术在减轻野外工作强度、提高图幅质量方面的效果，提出了遥感技术应用于常规１：５万区域地质调查的工作建议。  相似文献   

热嵌固齿工艺参数的确定   总被引：1，自引：0，他引：1  

符夷雄  刘金保 《地球科学》1989,14(3):333-340

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Rural women and technology in South Africa: Case studies from KwaZulu-Natal Province     

Urmilla Bob 《GeoJournal》2004,61(3):291-300

This article contributes to a greater understanding of the linkages between women's roles, responsibilities and their use of technology in poor rural communities. The ways in which poor rural women conceptualize technology is examined. Furthermore, how they use their knowledge and skills to develop, modify and adapt the techniques and technical processes in which they are involved are also explored. Additionally, the links between indigenous and modern technologies in relation to gender considerations in poor rural contexts are examined. This article draws from findings of primary research undertaken in two marginalized rural communities in Kwazulu-Natal, South Africa. The study reveals that the use of technologies are highly gendered and differentiated among women. Poor rural women utilize a range of technologies in both productive and reproductive activities which are central to their livelihood strategies, especially at the household level. Furthermore, although women are adapting and innovating technologies their expertise remains largely unrecognized. A range of problems and constraints exist which limit women's access to and use of technologies. A key tension identified in the study is that between the use of locally-based, indigenous technologies and modern, external technologies. This revised version was published online in July 2006 with corrections to the Cover Date.  相似文献   

花岗岩中熔融包裹体恢复均匀化后探针片的磨制工艺     

牛焕友常海亮  汪雄武 《岩矿测试》2004,23(2):157-158

针对磨制样品十分细小和较薄等特点，采用如下三个步骤磨制：①以加热过的细小样品为中心创建一磨制平面；②将样品周围的岩石薄块磨至接近细小样品的相同厚度；③在抛光机上抛光，使包裹体完全露出表面。文中还介绍了样品磨毛后观察其中包裹体的方法以及包裹体完全磨出表面后的若干识别标志。  相似文献   

土石混填路基修筑技术研究综述   总被引：21，自引：3，他引：21  

柴贺军  陈谦应  孔祥臣  董云 《岩土力学》2004,25(6):1005-1010

土石混合料作为一种填料，越来越广泛地被应用于工程实践，尤其是公路路基工程中．国内外学者对土石混合料的物理力学性质、压实特性和土石混合路基修筑技术已进行了大量的研究，但由于这些研究尚处于初级阶段，因而，仍不能满足工程实践的需要。笔者对不同石质类型、不同比例土石混合料的物理力学性质，土石混合料的分类、工程分级和性能评价，土石混填路基的均匀性及其强度与变形规律，土石混填路基的设计理论和设计方法，土石混填路基施工工艺及质量控制方法等方面进行深入系统的分析。提出了目前研究存在的问题及其解决的初步方法。  相似文献