鄂北岗地农田水利建设的问题与对策

鄂北岗地农田水利建设及管理的主要问题是主渠道不畅通;最大的瓶颈是建设维护水利设施的投入少、投工难;最难啃的"骨头"是水利条件较差、干旱严重的局部区域;最棘手的矛盾是水费收取和水价确定问题;最急需研究的是如何做到多部门效益的最大化。鄂北岗地区域内农田水利基本建设要坚持把灌区续建配套工程建设作为改善水利条件的战略举措来抓;坚持多渠道融资,倾力增加水利建设投入;坚持依靠基层组织,依靠广大群众,探索新形势下社会兴水的路子;坚持兴水与节水并重,建设水利工程与提高水资源使用效率并举;处理好供水、管水、用水的关系。鄂北岗地水利建设应从加快推进引丹灌区续建配套和节水改造;启动实施鄂北岗地东西高干渠、唐东补水、长山泵站等三项大型水利工程建设;以疏浚和修复干、支渠为重点,全面恢复各灌区灌溉能力;建立多元化投融资体制机制,完善投入管理办法,加强农田水利基本建设和管护;强化基层组织责任,教育组织农民群众,全民兴水,全面节水;争取把鄂北岗地水利设施建设提升为全省水利建设的战略重点六个方面入手。     

先觉庙水库清淤与水环境保护

先觉庙水库是随州市城区的主要水源地,因上游河道与库区淤积,使得水源地的水量、水质、水生态环境受到威胁.通过对水库水位、水量、泥沙的历史资料计算,分析水库供水水量的保障程度;比对监测库区天然状况和清淤试验现场的水质,分析了清淤作业对库区的水质影响时间和影响范围,最后提出相应的水资源保护措施.     

临沂市水资源承载力及其提升措施研究

随着城市建设、工农业生产的迅速发展,临沂市水资源越来越显得短缺,水资源供需关系日趋紧张．水资源承载力严重不足,并在一定程度上成为临沂市国民经济建设和社会可持续发展的重要制约因素。提高临沂市水资源承载力,必须建立科学的水资源管理体系,调整产业结构,加强水资源优化配置,促进社会经济、资源环境可持续发展,加大水资源保护工作力度,通过价格杠杆提高水资源的承载能力。     

What do people know about key environmental issues? A review of environmental knowledge surveys

This paper presents results from 15 little publicized state and national environmental surveys in the US that used similar questions. Our analysis reveals trends in adult understanding of environmental issues. These trends indicate that many may have difficulty making informed decisions about environmental policy as citizens, voters, and consumers. Some environmental myths are still prevalent in the US public’s understanding of environmental issues. The authors compare data from the National Environmental Education Foundation survey in the US and data from state surveys using the same questions to examine how public knowledge has changed from 1995 to 2008. Environmental myths and how they may affect the public’s perception of environmental topics are discussed. The authors suggest the need for greater consistency in the surveys of environmental knowledge to allow comparison among different studies.     

A Tale of Two Conferences: L.A.T.E., Two Key Moments in the Development of ‘London' English and the Questions that Still Need Asking

Current and recent policy around curriculum and pedagogy for English in England has seen a lack of principled thinking about what the subject should be and how it should best serve the needs of children. In postwar England, in London in particular, teachers and academics working within the London Association for the Teaching of English (L.A.T.E.) were engaged in just such principled thinking, driven by the need to formulate a ‘new' English in the context of a changing school landscape and a changing school population. Central to L.A.T.E.'s work was the focus on the child, and the need to devise a model of the subject that was, at its core, responsive to the experience, interests and language of students. Given the direction central policy around English has taken in the past 20 years, this article considers the importance of reevaluating L.A.T.E.'s work, and considers two key conferences in the history of the Association as important watershed moments in the development of these aspects of ‘London' English. In doing so, it argues that the questions for which L.A.T.E. members sought answers are precisely those that should be asked today, but that seem to be absent from policymakers' debates about English.     

钢帘线盐酸废水回用技术研究与应用

钢帘线生产酸性废水中氯离子含量高,难以回用。文章研究了盐酸再生和中水回用技术,采用阴离子均相膜扩散渗析法处理钢帘线盐酸废水,并将研究成果应用于江苏兴达钢帘线股份有限公司九厂污水站的工程实践。实践表明,该厂盐酸用量减少42％,中水回用率保持在80％以上,年节约经济总值达到780万元,取得了良好的经济、社会效益。     

高关水库灌区灌溉用水状态预测

依据高关水库1972～2010年灌溉用水量资料,应用均值标准差法建立4级分级标准。针对用水量为相依随机变量的特点,以各阶自相关系数为权重,运用马尔可夫链模型预测未来一年的灌溉用水量状态,结果表明,该方法直观、预测准确、计算简便,为灌区灌溉用水量的中长期预测提供了新的分析途径。     

水利类水资源保护课程实践教学模式的探索与实践

水资源保护课程实践型教学模式的提出,体现了“寓学于用”的核心思想,目的是形成一套有利于培养学生学习能力、创新能力和实践能力的教育新机制,实现了以传授知识为主要特征的“教学型”教学转变为以培养认知能力为主要特征的“实践型”教学。     

论近代水路运输与保定集镇贸易发展

第二次鸦片战争后,天津的被迫开埠,给保定地区的经济发展带来了契机,而水路运输的发展则成为推动保定经济发展的有力工具。水路运输的发展,进一步沟通了城乡之间的广泛交往,沿岸许多水运码头也随之兴旺起来,保定随着水运的发展而逐步成为本地区的工商业中心。     

平面简谐波势能的简易分析方法

平面简谐波是理工科专业《大学物理》课程中的重要内容。势能的分析和推导是平面简谐波教学中的难点。本文利用弹性波的传播机理和特征,提出一种简易的分析和推导平面简谐波势能密度函数的方法。此方法可以避开学生陌生和难以理解的一些物理量和概念,因此其可使教学过程大为简化,并便于学生掌握和深刻理解相关内容。