秦山核电厂安全壳对主蒸汽管道破裂事故的响应

一、概述核电厂安全壳是防止事故后放射性物质大量释放到坏境的最后一道屏障,是保护公众免受超剂量放射性照射的关键设施。人们对安全壳的重要性虽已认识有年,但得到明显事实验证的却是近年发生的美国三哩岛事故和苏联切尔诺贝利灾害性核事故。由表1可知,安全壳的有无对公众的影响是截然不同的。     

智能小区中的网络和布线设计解决方案——智能建筑学术讨论系列文章之七

当前小区信息网络建设中存在多种实施方案。笔者分析比较了常用的几种典型方案的优劣。讨论了目前建设中的一些解决方法，提出了兼顾现状，适度超前的设计实施原则。     

转制科研单位建立和完善内部会计控制的探讨

针对目前大多数科研单位在内部会计控制中存在的问题,根据财政部颁布的《内部会计控制规范一基本规范》,探讨了科研单位在转制过程中应如何建立和完善内部会计控制制度,以达到防范经营风险,保护资产安全、完整,确保经营管理目标和政策有效实施.     

倾斜水塔的爆破拆除

针对某部倾斜水塔的定向爆破拆除,从防止水塔倾倒偏移和筒体触地冲击地面对周围环境造成影响等不利情况,确定爆破方案和采取相应的防护措施.     

网络化时代包装企业的网络安全

分析了当前包装企业加强网络安全工作的必要性，并给出了相应的网络安全策略。     

1999年三峡大坝混凝土温控防裂研究与实践

1999年，为三峡工程二期施工阶段由开挖为主转入混凝土浇筑高峰期的关键一年，面临混凝土浇筑强度高、进度紧、温控设计要求严、高温季节浇筑基础约束区混凝土和施工设备投产晚的严峻局面。长江委设计院对1999年高温季节浇筑大坝基础约束区混凝土进行了专题研究。通过对大坝温度应力仿真研究和夏季各种温控措施效果分析，提出了夏季浇筑基础约束区混凝土的综合温控防裂措施。通过三峡工程参建各方共同努力，全面实施综合温控防裂措施，达到了预期效果，避免了大坝基础约束区产生危害性贯穿裂缝，并为顺利完成混凝土年度计划和形象面貌创造了有利条件。     

计算机网络安全措施

随着计算机网络的发展,网络安全问题也随之突出起来。本文介绍了局域网、广域网和外部网络安全的相应措施。     

竹坑水库大坝安全鉴定分析

在竹坑水库大坝安全鉴定中,认真分析了该工程存在的主要问题,并针对大坝的结构稳定和渗流稳定作了详细的分析论证.     

Experimental evaluation of fishway modifications on the passage behaviour of adult Chinook salmon and steelhead at Lower Granite Dam,Snake River,USA

Previous studies of Pacific salmonid passage over Snake River dams indicated slowed passage at transition pools, the transition area between the fishway entrance and the fish ladder. In 2001 and 2002, we conducted an experiment to determine if modified weirs affected adult salmon and steelhead passage times and route selection through the Lower Granite Dam transition pool. Fish attraction flows through the lower ladder weirs were experimentally increased using removable panels. During the experiment we monitored radio‐tagged adult Chinook salmon and steelhead to determine passage routes and times through the transition pool. The weir treatment increased the number of spring–summer Chinook salmon passing straight through the transition pool compared to those exiting the transition pool to the collection channel or tailrace. Mean passage times through the transition pool differed among routes and were significantly lower during treatment periods for the exit‐to‐collection channel route in spring‐summer Chinook salmon, but not for other routes. Passage times among routes differed in steelhead, but there was no evidence of treatment effects on route use or passage time. Fall Chinook exhibited similar trends in route use and passage time to spring–summer Chinook, but differences were not significant, perhaps because of relatively small sample size. Total dam passage times did not differ by treatment or route for any run. Fish depth during passage of the transition pool suggested that most fish passed through submerged orifices and supported the hypothesis that increased water velocity through these orifices caused the increase in straight‐through passage in spring–summer Chinook. Collectively, the results suggested the weir modifications provided improvement to passage through the transition pool for spring–summer Chinook and no evidence of negative effects on other runs. The results from this study were used to develop new design criteria and modifications of the Lower Granite Dam fishway. Copyright © 2006 John Wiley & Sons, Ltd.     

攀钢高炉焖砂口试验

分析了高炉冶练钒钛磁铁矿炉前砂口损坏的原因。对新型砂口泥进研制，同时改进了套砂口工艺，满足了攀钢高炉焖砂口的需要。攀钢高炉采用闷砂口工艺后，从根本上解决了铁水带渣问题，提高了铁水的洁净度。