带压堵漏作业防护探索与研究

本文分析了泄露现场的化学和物理危害因素及由此导致的各种后果,而且针对泄露事故对作业人员不同部位的伤害提出了相对应的个人防护用品,同时提供了与之相对应的国家行业标准.     

高寒地区碾压混凝土拱坝施工技术

介绍了在高寒地区的新疆石门子水库碾压混凝土拱坝,在恶劣气候条件下的施工技术及冻融保护措施。     

表面化学改性活性炭在水处理中的应用

介绍表面化学改性活性炭研究进展,针对其特点和改性方法作了系统描述.在此基础上,对其去除水中有机物、重金属离子、亚硝酸盐等污染物质做了简要说明.     

区域水资源短缺风险决策研究

为选择区域水资源短缺风险管理方案,在水资源短缺风险分析和评价的基础上,研究了水资源短缺风险决策的期望益损值法,最后对包括北京和天津在内的首都圈进行水资源短缺风险决策.结果表明,要彻底解决首都圈的水资源短缺问题,南水北调具有重要的作用,在南水北调存在的情况下,其他水资源管理措施的投资规模应该适度,这样才能保证区域社会经济的可持续发展和区域水资源的可持续利用.     

煤矿井下低压选择性漏电保护动作原理分析

介绍了目前国内煤矿井下660V、1140V供电系统所采用的几种选择性漏电保护的动作原理,指出存在的问题,并提出了改进措施及今后的研究方向。     

吉林省农业水资源与种植结构关系

本文在大量调研的基础上,就吉林省"十一五"期间实现增加粮食产量的发展目标,根据吉林省水资源现状与支持程度,提出进行农业产业结构的调整与优化思路.     

江门市区10 kV架空线路雷击分析和防治措施

以江门市区10kV架空线路雷击率为研究对象,以架空线路年雷击率计算理论为基础,对年均公里雷击率理论值与实际值进行比较分析。分析结果表明,市区裸导线的年均公里雷击率低于理论值的50%,绝缘导线的年均公里雷击率基本接近理论值,各镇线路的年均公里雷击率都超过理论值。最后针对存在的问题,提出了有效防雷措施和方法。     

Application of remote sensing to parks and protected area monitoring: Introduction to the special issue

This special issue is the result of sustained and highly collaborative efforts to improve the use of remotely sensed data to inform management of protected areas. The 15 papers in the issue address a diverse range of topics. These papers provide a conceptual basis and a framework for establishing monitoring programs, techniques and methods to make operational the use of remotely sensed data, case studies, and synthesis papers liking remotely sensed data to models used to inform ecological assessments. Studies in this issue necessarily confront the universal challenges of scale, both spatial and temporal, and the sometimes tenuous link between observed patterns and significant ecological process. A clear message is that the information needs of resource managers require information across scales, and these information demands will continue to motivate advances in the collection and analysis of remotely sensed data. This compilation of papers is unusual in (1) articulating a basic, if somewhat technical, foundation of remote sensing that is required for resource managers to effectively collaborate with remote sensing specialists, and (2) providing a framework for addressing monitoring resource issues that is likely to be of interest to many remote sensing specialists. We hope these papers inspire broader use of remotely sensed data to manage the increasingly rare and valuable resources in protected areas around the world.     

送电线路设计中对无线电设施的干扰影响及防护

送电线RI对无线电通信的干扰程度,取决于送电线路与收信设备之间的距离、接收天线的方位、接收设备的性能、制式、送电线路的各种参数以及天气条件等有关。     

空冷机组排汽装置疏水改进方案

我国现在生产的空冷机组都将排汽装置与凝结水箱做成一个整体,这种设计方案具有占地省、系统简单等显著优点,所以能得到推广应用。