上海城市净水工艺

介绍上海城市净水工艺,包括:净水药剂的采用、混合、絮凝、沉淀、过滤、氯化等。     

净水再污染及其防治

介绍湖南省部分县市净水再污染状况、再污染途径及其防治对策。     

基于android平台的试卷评阅系统开发研究

本文介绍了基于android平台的试卷评阅系统的开发过程,重点介绍了系统工作流程的实现,以及系统关键技术,即图像识别的处理,提出采用改进十三点特征点识别算法作为系统图像识别,并获得了较好效果。     

自动投药系统的设计与实践

介绍自动投药系统的设计思想,阐述了药液浓度控制在水厂自动投药系统中的重要性和必要性,最后介绍了它在南方某水厂的运用情况。     

热网远程监控系统的设计与实现

介绍了热网远程监控系统的设计思路、设计原理以及系统组成、结构、功能,并分析了该系统的技术特点。     

上海浦东燃气帐务系统及与其他系统数据库的共享

该文介绍了上海浦东燃气公司帐务系统组成、系统总体设计、软件系统结构设计以及与其他系统数据库的共享,并从数据库的安全性等方面详述了该系统的特点。     

城市区域给水以太网通讯系统研究

介绍了城市区域给水工程中,使用高带宽通用以太网通讯系统,使以太网通讯系统的利用率达到多网合一的作用,并介绍了根据实际工程情况切实可行的以太网络运行方式,满足城市给水工程的需要。     

指纹识别原理概述及研究

本文介绍了独立指纹识别系统的流程系统及原理,讨论了指纹识别的图像读取、指纹特征等概念。     

E-Learning系统的设计与实现

本文介绍E-Learning系统的特点,构思了完整的E-Learning系统模型,并将其与实践相结合。通过E-Learning系统的实践开发,实现全新的教学模式。     

守护一片净水

探访郑鼎沐是“2009寻源千岛湖”活动的一个特别收获。十年前，农夫山泉淳安水厂建成的时候，取水口选在千岛湖东南湖区的宋家湾水面下30米，来自淳安威坪镇的郑鼎沐被聘为水源看护人。一晃，十年过去，农夫山泉已经成为家喻户晓的品牌；而郑鼎沐，在三千六百个昼与夜中，一直坚守在宋家湾取水口那个人迹罕至的寂寞小岛上，与湖水作伴，细心呵护这一片纯净的水域。     

“Water Is Life”—Farmer Rationales and Water Saving in Khorezm,Uzbekistan: A Lifeworld Analysis

Khorezm Province is located in the Amu Darya lowlands of Uzbekistan, where unsustainable use of irrigation water has led to the Aral Sea crisis. This study deals with the question of how farmers in Khorezm perceive water and its management and how this facilitates or prevents water conservation, or “water saving,” in irrigated agriculture. To answer this from the perspective of the water users, we apply Schütz's lifeworld concept to the study of natural‐resource management, thereby reconstructing the water lifeworld of Khorezmian farmers. We present the spatial and temporal boundaries of the water lifeworld; the different types of water, people, and land that farmers distinguish; and the institutions water management is based on. The analysis shows that religious values and the risk of being fined for water wasting facilitate water saving. However, the following barriers to water saving dominate farmer practices: (1) storage of saved water is not possible, (2) using much water creates social capital, (3) perceived water needs exceed the geographical realities, (4) the term “water saving” is not in use, and (5) farmers believe that water management is the state's responsibility. We conclude that water saving should be facilitated by environmental education, a strengthening of the water‐inspection department Uzsuvnazorat, and the creation of decentralized storage options.     

浅谈上海市郊区集约化供水

该文分析了上海市郊区供水水质的影响因素,认为郊区小型水厂已经不能满足郊区居民对饮用水水质的要求。并结合上海宝山供水管理所的集约化供水工作,阐明郊区集约化供水是城市发展与供水基础设施建设的必然趋势。     

Contesting Water Rights: Collective Ownership and Struggles against Privatization

The post‐1980s have seen increasing struggles over rights to water. Water rights have involved intense protests and campaigns against privatization of water including bottling of water and advocacy for citizens control of water. We review scholarly work to focus on four main aspects: the complexities intertwining globalization processes, the state, and water rights; collective ownership of water resources; peoples’ participating in managing and using water; and the campaigns against privatization which have emerged in both the developing and developed world in different ways. The conclusion calls for adopting a social movement lens to examine the struggles for water rights by providing some lead research questions around the macro and micro level theoretical approaches.     

上海城市用水的可持续发展对策

介绍上海城市水资源概况、2010年需水量发展预测、新水源开发计划及加强用水管理     

Like Oil and Water in the American West: Water Market Access amid Unconventional Oil Production in Colorado

Characterized as a “wicked” problem, water shortage in the American West will soon become a reality—due to increasing population, climate change, and decreased flows. Concurrently, water‐centered technologies such as hydraulic fracturing and directional drilling have facilitated the rapid and widespread growth of unconventional oil and gas (UOG) production in the United States. Water markets are increasingly touted as the best, most efficient, and fairest mechanisms for allocating vital and scarce resources. Yet this contention is largely unexplored at the food‐energy‐water nexus, particularly from an environmental justice perspective—where equitable water access for all users is a central concern. We utilize a case study in Colorado's South Platte basin based on 41 in‐depth interviews to show: (1) distortions created in regional water markets as wealthy UOG operators participate in them and (2) ways in which access to water markets becomes blocked for smaller, newer, or water‐poor water users. We also highlight how UOG producers’ presence may inhibit the formation of alternative systems for water exchange. Thus, the participation of UOG operators in Colorado's water markets appears to drive environmental injustice and increased inequity at the food‐energy‐water nexus, rather than facilitating fair or efficient access to water for all users.     

An Effective,Feasible, And Cost-Efficient Water Strategy For 2013 To Meet The Projected Water Need Of China In Future

Water resources carrying capacity is a foundational topic in water resources security strategic study and the foundational measurement of water resources security. Water resources constrain the scale and quality of social and economic development in many water shortage cities and regions. Thus, the management via dynamic water resources prediction is a key for the overall city strategic planning. In this study, an integrated dynamic model of water consumption was developed using system dynamics (SD) and based on water resources carrying capacity (WRCC) theory.     

Environment,Development, and Water in Academia: A Critical Network Perspective

The world is currently confronting two water crises, a developmental crisis concerning populations who lack access to water and an environmental crisis regarding water scarcity and freshwater resource depletion. Are we as academics addressing the complexity of these issues? Using network analysis of over 5,000 articles that address water development and water scarcity, I generate a co-citation network to identify the overlap between development and environmental water literatures in academic journals. The results suggest that the development literature only has a 6.28 percent overlap with the environmental literature and the environmental literature has a mere 1.92 percent overlap. Overall, this research suggests that there is an extreme lack of academic articles that address water scarcity and water development concurrently. Until we as an academic community become more nuanced in our studies of water, we will lack a full understanding of how to solve these seemingly contradictory problems. I conclude by drawing on critical Marxist and “Frankfurt School” perspectives to explain this apparent disconnect.     

2006 PRESIDENTIAL ADDRESS WATER MARKETS IN THE WEST: PRICES, TRADING, AND CONTRACTUAL FORMS

Rising urban and environmental demand for water has created growing pressure to reallocate water from traditional agricultural uses. The evolution of water markets has been more complicated than those for other resources. In this paper, we first explain these differences by examining water rights and regulatory issues. Second, we place our research in the context of the economics literature on water marketing. Third, we present new, comprehensive data on prices and the extent, nature, and timing of water transfers across 12 western states from 1987 to 2005. We find that prices are higher for agriculture-to-urban trades versus within-agriculture trades, in part, reflecting the differences in marginal values between the two uses. Prices for urban use are also growing relative to agricultural use. Markets are responding in that the number of agriculture-to-urban transactions is rising, whereas the number of agriculture-to-agriculture transfers is not. Further, there is a shift from using short-term leases to using multiyear leases of water and permanent sales of water rights. This pattern underscores the need to consider the amounts of water obligated over time rather than examining only annual flows in assessing the quantities of water traded as is the common practice in the literature. Considering water obligated over time, termed committed water, we find significantly more is transferred and the direction of trading is different than if the focus is on annual flows. Finally, the data reveal considerable variation in water trading across the states. ( JEL Q2, N5, L5, K3)     

湖州市改善城镇供水水质初探

介绍浙江省湖州市水源水质现状和改善其城镇供水水质的途径,发展区域供水和加强水源保护等。     

Water sources of urban trees in the Los Angeles metropolitan area

In semi-arid cities, urban trees are often irrigated, but may also utilize natural water sources such as groundwater. Consequently, the sources of water for urban tree transpiration may be uncertain, complicating efforts to efficiently manage water resources. We used a novel approach based on stable isotopes to determine tree water sources in the Los Angeles basin, where we hypothesized that trees would rely on irrigation water in the soil rather than develop deep roots to tap into groundwater. We evaluated the oxygen (δ¹⁸O) and hydrogen (δD) isotope ratios of xylem water, irrigation water, soil water, and groundwater in a study of temporal patterns in water sources at two urban sites, and a study of spatial patterns at nine urban sites and one “natural” riparian forest. Contrary to our hypothesis, we found that despite frequent irrigation, some trees tap into groundwater, although in most species this was a small water source. Some trees appeared to be using very shallow soil water at <30 cm depth, suggesting that these mature urban trees were quite shallowly rooted. In the natural site, trees appeared to be using urban runoff in addition to shallow soil water. We were able to identify tree uptake of precipitation at only 3 sites. The results show that some irrigated trees utilize groundwater and do not rely solely on irrigation water, which may make them able to withstand drought and/or water conservation measures. However, some irrigated trees may develop very shallow root systems, which may make them more susceptible.