Variations of a passive safety containment for a BWR with active and passive safety systems

The paper presents variations of a certain passive safety containment for a near future BWR. It is tentatively named Mark S containment in the paper. It uses the operating dome as the upper secondary containment vessel (USCV) to where the pressure of the primary containment vessel (PCV) can be released through the upper vent pipes. One of the merits of the Mark S containment is very low peak pressure at severe accidents without venting the containment atmosphere to the environment. Another merit is the capability to submerge the PCV and the reactor pressure vessel (RPV) above the core level by flooding water from the gravity-driven cooling system (GDCS) pool and the upper pool. The third merit is robustness against external events such as a large commercial airplane crash owing to the reinforced concrete USCV. The Mark S containment is applicable to a large reactor that generates 1830 MW electric power. The paper presents several examples of BWRs that use the Mark S containment. In those examples active safety systems and passive safety systems function independently and constitute in-depth hybrid safety (IDHS). The concept of the IDHS is also presented in the paper.     

一个企业生产经营决策支持系统研究

本文以一个钢丝绳生产企业的生产经营为背景,建立了以生产经营优化模型和调整系统为基础,以数据仓库为核心的生产经营决策支持系统并对其进行了研究。该系统为企业不同层次的决策者提供了科学的辅助决策方案,为企业获得满意的经济效益奠定了基础。     

Health risk associated with dietary co-exposure to high levels of antimony and arsenic in the world's largest antimony mine area

Like arsenic (As), antimony (Sb) is known to be a genotoxic element in vitro and in vivo. Sb is now recognized as a global contaminant and has aroused the global concerns recently. However, knowledge is scarce concerning the transfer of Sb from the environment to humans and the related hazards to human health. In this pilot study, the health risk and main pathway of long-term human exposure to Sb and As for residents around Chinese Xikuangshan (XKS) Sb mine, the world's largest Sb mine, were evaluated by dietary exposure and hair accumulations survey. The concentrations and species of Sb and As in food samples (n = 209) from three main categories and six subcategories, and in hair samples (n = 89) were determined. Residents in the vicinity of XKS had an estimated dietary intake of Sb (554 μg/day) which was 1.5 times higher than the tolerable daily intake (TDI) (Sb, 360 μg/day), whereas their dietary intake of inorganic As (107 μg/day) was slightly lower than the provisional tolerable weekly intake (PTWI) of 15 μg/kg BW/week (equal to 129 μg As/day). Hair Sb and As concentrations (Sb, 15.7 mg/kg, DW; As, 3.99 mg/kg, DW) in XKS residents are both above the normal/toxic level. Rice, vegetables (especially leafy vegetable), drinking water, and meat/poultry were the dominant dietary intake sources of Sb for the residents. In contrast, rice was the uniquely dominant dietary intake source of As. Antimonate (Sb(V)) was the dominant Sb species in vegetables, drinking water and residents' hairs. This study highlighted the difference of exposure characteristics between Sb and As. The preliminary results suggested that dietary exposures to Sb, rather than As, was the dominant health risk to local residents. Nevertheless, the adverse effects of As levels on the health of residents still can not be ignored since the elevated As concentrations in human hair have reached the critical level for health risks. In addition, this pilot study did not consider the possible Sb and As combined effects.     

面向数据仓库技术的财务决策支持系统研究

以数据仓库技术为核心,结合联机分析处理技术和数据挖掘技术的基础上,构建了财务决策支持系统,通过使用数据仓库的联机分析技术和数据挖掘技术强化了DSS的智能功能,为企业财务决策提供服务。     

基于数据仓库的供电指标分析系统研究

分析了目前电力行业信息系统的现状,从必要性和可行性方面论证了建设电力行业数据仓库是信息化发展的必然。指出了数据仓库系统的建设是一个循环的建设体系,需要通过不断的用户需求分析对现有系统进行完善,并对供电企业的数据仓库建设提出了建议。     

GW16A-252DW型隔离开关拒动故障原因分析及处理

针对某局范围内长高GW16A-252DW型隔离开关拒动现象,简单介绍GW16A-252DW型隔离开关结构,结合上下导电管进行解体,分析故障出现的原因,并提出了相应的解决方案,防止拒动故障的再次发生。     

基于数据仓库的房地产数据分析系统

针对房地产信息系统积累的大量房产数据,研究并实现基于数据仓库及OLAP技术的房地产智能数据分析系统.首先建立了分离的数据仓库,并对数据仓库进行多维建模和多维分析;然后对多维数据模型进行了切片、切块,旋转、上钻和下钻等多维分析,从多角度进行房产数据分析,并计算房产指数;最后利用前端开发工具开发了可视化的多维分析和数据展示平台.实践表明,基于数据仓库的房产数据分析系统可以为房地产管理层和决策层提供高效的决策支持.     

GW4(A)-40.5DW型隔离开关导电带过热原因分析及改良设计

GW4(A)-40.5DW型户外高压隔离开关在电网中应用广泛,而该型隔离开关导电带存在结构性缺陷,经常出现导电带过热问题。为保证电网安全,针对该型隔离开关导电带结构进行分析,设计出新型导电带并在现场成功实施更换改造。改造后的导电带端部设计为铝质结构并一次焊接成型,将导电带紧固部分设计为对穿螺丝的结构,将导电带软连接设计为铝质结构,解决原有结构性缺陷。     

智能化决策支持系统框架的研究与设计

主要在对智能化决策支持系统（IDSS）进行研究并分析目前研究成果的基础上,根据IDSS的开发过程和特点,融合Web开发的MVC设计模式的思想,采用专家系统（ES）、数据仓库（DW）、联机分析处理（OLAP）和数据挖掘（DM）等技术,提出一种综合IDSS的结构框架,将其划分为4个层次,并对各个层次的作用分别进行说明。     

单卧轴搅拌机叶片角度对混凝土拌和物均匀性的影响

针对DW160单卧轴拌和系统在设备、原材料、操作规范、温度等外界环境最优的条件下,混凝土分层、离析现象严重,混凝土拌和物均匀性达不到浇筑高峰期施工要求的问题,基于搅拌机工作原理、骨料搅拌时间对混凝土均匀性影响的分析,结合既有施工经验,在控制质量、节约成本的前提下,提出了优化搅拌机叶片角度、增加骨料搅拌时间的方案。试运行表明,该方法下骨料在搅拌罐内的搅拌时间得到适当延长,混凝土的均匀性得到较好改善。