基于WebGIS水利信息系统的设计与实现

通过对比分析目前WebGIS的常用开发方法和软件平台的特点,结合实际需求选择．NET和AreIMS技术,利用ArcIMS中的Serdet连接器和ArcXML语言的优点,在．NET环境下对ArcXML的生成进行封装,并结合ASP．NET技术设计了通用的WebGIS控件。该控件较好地实现了WebGIS中表现层与服务层的分离,可以方便地进行二次开发和与其他．NET系统集成,从而大大降低了WebGIS在．NET平台下的实现难度,并使系统具有了更好的可扩展性,通过在博州水利信息系统的应用实例介绍了实现过程。     

图书馆书库清点方法初探

图书馆藏书大多存在实物与财产登记不符的状况,如情况较为严重则会影响到图书馆流通、采访等项工作的开展,因此适时进行书库清点具有重要意义。本文以中国环境管理干部学院图书馆的清点为实例,初步探讨了将条码作为清点切入点的书库清点工作的方法、步骤和注意事项。     

城市安全生产预警系统框架及关键技术研究

随着经济全球化和世界一体化进程的加快,城市安全生产问题成为各个国家日益关注的新兴社会问题.我国城市安全生产预警系统还不健全,处理和管理危机能力不强,需要进一步完善.通过运用系统学、管理学等理论和方法,依据城市安全生产现状,构建了城市预警系统的总体框架.通过对预警系统关键技术的分析研究,使城市生产安全事故预警处置做到组织科学化、指挥智能化、处理系统化、保障统筹化,增强和保证城市安全生产综合管理能力和抗风险能力.     

生态工业园区"四位一体"运行模式研究

生态工业园区是依据清洁生产要求、循环经济理念及工业生态学原理,设计建立的一种新型工业园区。生态工业园区遵从循环经济的3R原则。建设生态工业园区是一个系统工程,构建政府、企业、公众、中介组织为主的“四位一体”生态工业园区运行模式。为诚国生态工业园区理论研究的深化和实践的深入提供参考。     

应用D412螯合树脂治理含镍电镀废水的研究

本文研究了Ｄ４１２螯合树脂对Ｎｉ（Ⅱ）离子静态和动态的吸收性能,并且研究了使用Ｄ４１２树脂除去和回收电镀废水中镍的最佳条件。     

陕西省2000年天气气候异常变化与自然灾害

分析陕西省2000年天气气候变化发现,隆冬降雪明显增多,春旱异常严重,秋霖明显,沙尘暴天气明显增加,这是多年来未曾见到的现象。异常的天气气候使得多种自然灾害并发。     

氯酚与富里酸的缔合作用

本文用超滤膜方法证实氯酚与富里酸之间存在缔合作用,并计算出表观缔合常数在２．７＊１０＾３－－１２１＊１０＾３ｍｌ．ｇ＾－１范围内。实验结果表明”ＰＨ、富里酸含量,氯酚取代氯原子个数都能够影响Ｋ值的大小。     

Fraction characteristics of rare earth elements in the surface sediment of Bohai Bay, North China

Surface sediment samples were collected at 27 stations of Bohai Bay, North China. Sequential extractions were carried out in this study. REE were leached out from four labile fractions: Exchangeable (L1), bound to carbonates (L2), bound to Fe–Mn oxides (L3), bound to organic matter (L4), and the remainder was residual (R5). The total contents of REE fluctuate slightly in Bohai Bay, and are mainly concentrated in the middle region, showing relatively higher levels in the north than that in the south of Bohai Bay. Percentages of L1, L2, L3, L4, and R5 for REE suggest that the residual fraction accounts for the major component of REE, whereas Fe–Mn oxides also play important roles in combining labile REE. As the REE complex is not stabilized, the competition of complex could induce dissociation of the complex and redistribution of the REE in various environments. According to REE patterns and Y/Ho ratios of samples, REE are not anthropogenic or oceanic sources but riverine input, whereas suitable environment varieties can slightly affect the patterns and fractionations of REE. As powerful tracers for the variable of environment, higher anomaly of Eu and Ce in southern regions indicates a greater reduction in the condition of surface sediment in the south than that in the north of Bohai Bay.     

Projected Years Lost due to Disabilities (YLDs) for bacillary dysentery related to increased temperature in temperate and subtropical cities of China

The impact of climate change on enteric infection has been a concern in recent years. This study aims to project disability burdens of bacillary dysentery (BD) associated with increasing temperature in different climatic zones in China. Years Lost due to Disabilities (YLDs) were used as the measure of burden of bacillary dysentery in this study. A temperate city in northern China and a subtropical city in southern China were selected as the study areas. The quantitative relationship between temperature and the number of cases in each city was base on the regression models developed in our previous studies. YLDs for bacillary dysentery in 2000 were used as the baseline data. Projection of YLDs for bacillary dysentery in 2020 and 2050 under future temperature scenarios were conducted. Demographic changes over the next 20 to 50 years in study cities were considered in the projections. Under the temperature scenarios alone, the YLDs for bacillary dysentery may increase by up to 80% by 2020 and 174% by 2050 in the temperate city and up to 75% increase in the YLDs by 2020 and a 147% increase by 2050 in the tropical city. Considering potential changes in both temperature and population size and structure, if other factors remain constant, compared with the YLDs observed in 2000, the YLDs for bacillary dysentery may double by 2020 and triple by 2050 in both the temperate and subtropical cities in China. The temperature-related health burden of enteric infection in China may greatly increase in the future if there is no effective intervention. Relevant public health strategies should be developed at an earlier stage to prevent and reduce the impact of infectious disease associated with climate change.     

Chlorinated and brominated dibenzo-p-dioxins and dibenzofurans in surface sediment from Taihu Lake, China

Polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/Fs) and polybrominated dibenzo-p-dioxins and dibenzofurans (PBDD/Fs) in surface sediment samples from Taihu Lake--an important water supply of the Yangtze River Delta, China--were investigated in the present study. Concentrations of PCDD/Fs ranged from 0.91 to 4.8 pg TEQ g(-1) dw (mean: 2.9 pg TEQ g(-1) dw, TEQ: Toxic Equivalent), which were all higher than the threshold effect level established by interim sediment quality guidelines in Canada (0.85 pg TEQ g(-1) dw). The levels of PBDD/Fs ranged from 0.16 to 1.6 pg TEQ g(-1) dw (mean: 0.52 pg TEQ g(-1) dw) and accounted for 5-33% (mean: 14%) of the total PCDD/Fs and PBDD/Fs TEQ. Comparatively, the abundance of sedimentary PCDD/Fs in the three regions (Meiliang Bay, Gonghu Bay, and Xukou Bay) showed a decreasing trend from the inflow region to the outflow region, while no significant difference was observed among their 2,3,7,8-PBDD/Fs levels, which suggested that the sources of PCDD/Fs and PBDD/Fs differed in this area. Principal component analysis suggested that the historical production/usage of pentachlorophenol and sodium pentachlorophenate was the dominant source of PCDD/Fs in the sediment of these regions. Although the specific sources of PBDD/Fs in the sediment of Taihu Lake were unclear, it was suspected to be due to atmospheric deposition; however, an additional study is needed to confirm this.