地理学基本规律及其对社会发展的影响

地理学是自然科学与社会科学的汇合,是一门独立科学,有特定的功能和演变规律。地理学的基本规律包括有地域分异规律、地域综合规律和地域发展规律等。研究地理学的基本规律有助于认识许多复杂的历史事件和社会活动,对构建社会建设的总体思想和区域发展战略有重要指导意义。     

碱性红13分光光度法测定氰化物浸出液中金(Ⅰ)的研究及应用

本文研究和确定了碱性红13显色、乙酸异戊酯萃取光度法,直接测定氰化物浸出液中金(I)的条件和方法。Au(CN)_2离子与显色剂形成1:1的离子缔合型配合物被乙酸异戊酯萃取,在有机相中至少稳定22h,配合物在540nm波长处有最大吸收,表观摩尔吸光系数ε_((?)40)=4.4×10~4L·mol~(-1)·cm~(-1)。金含量在0～20ug/5ml乙酸异戊酯范围内符合比尔定律。方法具有简便、快速、重现性好、毒性较小、成本低、实用性较强等优点,用于金矿浸出液的分析,结果令人满意。     

基性超基性岩型金矿床的成矿作用讨论

基性超基性岩型金矿床是指空间上与基性超基性岩密切相伴和成因上有关的金矿床。该类金矿床的成矿物质多源多样和多期次,且多赋存于构造蚀变带中。与其它类型金矿床相比,我国此类型金矿床的研究比较薄弱,其找矿前景看好。讨论了其成矿地质特征、成矿作用和找矿标志,并提出找矿建议。     

ANALYSIS ON THE DEBRIS FLOW SURGES

ＡＮＡＬＹＳＩＳＯＮＴＨＥＤＥＢＲＩＳＦＬＯＷＳＵＲＧＥＳ￥ＷａｎｇＧｕａｎｇｑｉａｎ（Ｐｒｏｆｅｓｓｏｒ，Ｄｅｐｔ．ｏｆＨｙｄｒａｕｌｉｃＥｎｇｉｎｅｅｒｉｎｇ，ＴｓｉｎｇｈｕａＵｎｉｖｅｒｓｉｔｙ）Ａｂｓｔｒａｃｔ：Ｂａｓｅｄｏｎｔｈｅｆｕｎｄａ...     

Sediment yield in the upper Krishna Basin,Maharashtra, India

A 235.5 km² headwater catchment of the Krishna River in the Deccan plateau lavas is dry for eight months of the year but receives intense monsoonal rains during four months. High initial suspended sediment concentrations fall as rapid vegetation growth provides increasing protection. During a six-year period annual suspended sediment yields from the deeply weathered kaolinitic soils ranged between 36.9 and 275.3 t km^?2 in dry and wet years respectively.     

Expanding networks for the urban poor: Water and telecommunications services in Lima, Peru

In many cities of the developing world, poor residents occupy land and build their dwellings before infrastructure is provided. Expanding the infrastructure networks for the poor is a long, expensive and complicated affair. Before the 1990s, the public sector was generally in charge of the basic services; but these services have been liberalized and, in many cases, privatized since then. In this new context, a relevant question is: have these reforms contributed to urban integration? Or, on the contrary, have they contributed to deepen urban fragmentation? This study presents the case of water and telecommunications services in Lima, Peru, the most contested and politically sensitive urban sectors. The objective is to test Graham and Marvin’s claims about the splintering of networked infrastructures expressed in Splintering Urbanism.The findings show that the reforms have improved the situation at aggregate level, but there is still no sustainable solution for the crucial dilemma of cities with high poverty restrictions: self-financed network expansions versus service affordability. The diverging paths of the utilities reform in Lima illustrate that privatization is not the main issue in the discussion to expand the networks for the poor. The main conclusion is that sensible policies complemented with carefully targeted subsidies and continuous regulation can successfully provide water for all. Good governance practices at the urban level help to achieve this goal. Water and telecommunications in Lima also show that are no general solutions for the universalization of the services; each city is different and some sectors are much more complex and problematic than others. This demands careful and continuous technical and political consideration of the local circumstances to reform the utilities.     

TIMER控件在试题库系统中的应用

用Visual Basic 6.0的定时器控件,给不同的用户设置随机的初始密码,并把用户和密码一起保存在数据库中.     

基于Web的地形图查询信息系统设计与开发

目前的地形图查询系统存在着依赖GIS二次开发平台、功能不够全面和不能实现网络查询等不足.基于Visual Basic.NET开发平台,设计实现了一个功能较完善的网络地形图查询信息系统,实现了单点图幅查询、矩形区域查询以及任意区域图幅查询功能.     

关于建立省级土地管理基础数据体系的思考

本文针对当前土地管理基础数据库中存在的问题,以省级土地管理基础数据体系建设为研究对象,讨论了基础数据体系设计原则,研究和设计土地管理基础数据体系的总体架构,提出了基础数据体系中数据获取、数据分类和密级确定的方法,以及基础数据体系在新时期土地管理工作中的作用。     

VB在普通水准测量中的应用

结合笔者的生产实践,介绍了在工作中找到的小巧门,即在Visual Basic 6.0环境下,通过VB编程对EX-CEL表格的控制,来实现水准测量记录簿的自动生成的设计思路和实现方法.减少人为干涉过程,减小测量人员的劳动强度,显著提高工作效率.