我国水资源可持续发展战略之研究

分析了中国水资源的特点和基本概况,探讨了水资源利用而应采取的全方位措施.即增强忧患意识,改变思想观念,保护自然资源,优化生态环境.     

Application of advanced core process monitoring procedures in German power reactors

The nuclear reactor core design and the nuclear fuel management have been changed remarkable during the last few years. This development was initiated by increasing costs for the fuel recycling and nuclear waste storage. The fuel material, the fuel pellet fabrication, the fuel assembly structure and the core composition have been varied to get an effective fuel exploitation. Based on advanced core process conditions the reactor power and the fuel burn-up have been increased at German plants in recent years. Improved dynamic process monitoring procedures are required to get more information about the varied core process behaviour during the reactor operation. Since several years ISTec has been performed investigations to the process monitoring based on process signal measurements in German nuclear power plants. Using the standard instrumentation of the plants process signals have been measured and analysed by means of the digital data acquisition system SIGMA. The measured time signals are influenced by core process transients, global and local process fluctuations and by signal line transfer functions. Advanced time series analysis methods have been applied to separate different process effects in the multiple signal matrix. The separation of different process influences can improve significantly the information about the process condition in the reactor core.     

A comparison of 18 winter seasons of in situ and passive microwave-derived snow water equivalent estimates in Western Canada

The Meteorological Service of Canada (MSC) has developed an operational snow water equivalent (SWE) retrieval algorithm suite for western Canada that can be applied to both Scanning Multichannel Microwave Radiometer (SMMR) and Special Sensor Microwave/Imager (SSM/I) data. Separate algorithms derive SWE for open environments, deciduous, coniferous, and sparse forest cover. A final SWE value represents the area-weighted average based on the proportional land cover within each pixel. The combined SSM/I and SMMR time series of dual polarized, multichannel, spaceborne passive microwave brightness temperatures extends back to 1978, providing a lengthy time series for algorithm assessment. In this study, 5-day average (pentad) passive microwave-derived SWE imagery for 18 winter seasons (December, January, February 1978/79 through 1995/96) was compared to SWE estimates taken from a distributed network of surface measurements throughout western Canada.Results indicated both vegetative and snowpack controls on the performance of MSC algorithms. In regions of open and low-density forest cover, the in situ and passive microwave SWE data exhibited both strong agreement and similar levels of interannual variability. In locations where winter season SWE typically exceeded 75 mm, and/or dense vegetative cover was present, dataset agreement weakened appreciably, with little interannual variability in the passive microwave SWE retrievals. These results have important implications for extending the SWE monitoring capability of the MSC algorithm suite to northern regions such as the Mackenzie River basin.     

万家寨水电站经济运行的措施

针对黄河近几年来水量逐年减少和电力市场的变化 ,对提高万家寨电站的经济运行效益问题 ,进行了分析     

浅谈水闸沉井基础施工技术

在钱塘江沿岸水利工程建设中，采用沉井基础，迄今有30多年的历史，作者从长期的施工实践中，摸索了一些经验与体会，主要介绍水闸的单井沉放和多井间隔沉放的沉井基础施工技术。     

临安市城乡供水一体化的供水能力确定

文章采用分项定额法，单位人口综合用水量指标法和基准年法分别计算，确定城乡供水的供水能力。     

顾及多个因子的卡尔曼滤波法在大坝变形分析中的应用

首先建立大坝变形与时间相关关系的变形模型，从中找出变形与时间相关关系的最佳变形模型;然后考虑到库水位和温度对大坝变形的影响，建立变形与时间、水位、温度相关关系的变形模型;最后将变形与时间、水位、温度相关关系的变形模型的模型参数作为状态向量，用卡尔曼滤波法进行大坝变形分析。实例计算表明这种建模方法效果较好。     

焦化废水中多组分酚的因子分析—岭回归-光度法同时测定

根据3-甲基-2-苯并噻唑腙(MBTH)与酚类发生偶合显色反应而生成有不同颜色的稳定配合物的特点,测定废水中酚类混合体系的吸收光谱,结合因子分析和岭回归技术对工业废水中苯酚、邻甲酚、3,4-二甲酚、2,3-二甲酚、邻苯二酚等多组分酚的光谱数据进行解析,成功的确定了废水中酚的物种数,物种种类及各物种含量.     

Ag(Ⅰ)-5-Br-PADAP-SDS 体系的褪色分光光度法测定硫化物的研究

在ｐＨ５．３～６．６的ＨＡｃ－ＮａＡｃ缓冲介质中，有十二烷基硫酸钠存在，硫化物使Ａｇ（Ⅰ）－５－Ｂｒ－ＰＡＤＡＰ络合物的颜色减退。Ｓ２－在０～５μｇ／２５ｍＬ范围，吸光度减弱与Ｓ２－浓度成正比。其表现摩尔吸光系数为１．２×１０５Ｌ·ｍｏｌ－１·ｃｍ－１。方法用于污水中硫化物的测定，结果满意。     

关于冷却塔蒸发水量带走热量系数问题

就目前冷却塔热力计算中，不同作者对蒸发水量带走热量系数Ｋ的处理及存在问题进行了分析研究，并提出了自己的见解。