晋城市郭壁水源地二期供水工程开发利用探讨

晋城市作为省能源重化工基地，水资源开发利用极不合理，文中通过对晋城水资源和市区供水情况分析，论证了开发利用郭壁水源地二期供水工程的合理性和必要性，并同时提出充分开发利用郭壁水源地需解决的问题。     

新疆水资源承载力探析

新疆水资源制约着新疆的绿洲经济发展,分析水土资源之间的关系有助于合理配置水资源。本文通过水土资源之间的关系分析,估算了新疆水资源的承载能力,从而得出新疆水资源量是稳定且有潜力的,并且能够支撑新疆社会经济发展的结论。     

社会资本影响因素的经验研究

社会资本日益成为社会学、经济学、管理学和政治学等多学科共同研究的热点,不同学科的理论分析和经验研究都发现社会资本可以对经济增长、社会稳定及企业的发展起到很好的推动作用。但是对于社会资本的产生以及哪些因素可以提升企业的社会资本却没有较好的研究,笔者试图通过对上市公司的实证分析发现影响企业社会资本的内部与外部因素,以帮助企业能够有针对性地提升自己的社会资本。     

反思与超越：水权交易中公民参与维度的构建

在水权交易中提高公民参与的力度,契合民主社会发展之需要,促进水资源的优化配置。利益博弈是公民参与水权交易主要动因,社会讯息互动、法律制度保障、公民参与精神等的缺失是当前制约公民参与水权交易的现实困境,因而今后应着力进行公民参与的多重建构,具体可在水权交易中引入公共参与的概念并对之进行具体体系构建,从法律和精神两个层面出发,通过全局体系构建模式完善公民参与制度。     

CEO DUALITY AND FIRM PERFORMANCE: WHAT'S THE FUSS?

Rising shareholder activism following poor corporate performance and a subsequent drop in shareholder value at many major U.S. corporations had rekindled interest in duality and corporate governance. Despite limited empirical evidence, duality (chairman of the board and CEO are the same individual) has been blamed, in many cases, for the poor performance, and failure of firms to adapt to a changing environment. In examining the relationship between duality and firm performance, this study considers the announcement effects of changes in duality status, accounting measures of operating performance for firms that have changed their duality structure, and long-term measures of performance for firms that have had a consistent history of a duality structure. Our results suggest that: (1) the market is indifferent to changes in a firm's duality status; (2) there is little evidence of operating performance changes around changes in duality status; and (3) there is only weak evidence that duality status affects long-term performance, after controlling for other factors that might impact that performance.     

抚顺地区参考作物需水量与气象因素的关系

根据抚顺地区3个气象站10年的气象资料,应用Penman-Monteith公式计算了10年来每年(5～9月)各月的参考作物需水量ET0,分析了ET0的月际变化和年际变化特征,同时分析了各气象因素对ET0的影响。日照时数(H)是影响抚顺地区参考作物需水量ET0最主要因素。     

Macroinvertebrate assemblages of littoral habitats in the Macquarie and Mersey rivers,Tasmania: Implications for the management of regulated rivers

Littoral habitats in large rivers are influenced to varying degrees by changes in discharge. Irrigation abstractions can increase the amount of habitat that would naturally be dewatered during low flow periods and therefore it is important to have some knowledge of the potential impact this may have on riverine macroinvertebrates. The macroinvertebrate assemblages of common littoral habitats in riffles, pools and runs in two reaches each of the Macquarie and Mersey Rivers, northern Tasmania, Australia were compared from samples collected during the low flow and irrigation season, between December 1991 and April 1992. The area under water of these habitats, riffle substrata, macrophyte beds and coarse woody debris, responded differently to changes in discharge. Within a reach, the same taxonomic groups often dominated the total number of macroinvertebrates for all habitats, but there were differences in the proportions contributed by these taxa to the different habitats. In general, taxa characteristic of slow-flowing or lentic habitats, such as ostracods and amphipods, were dominant in macrophyte beds in pools and runs, whereas taxa such as larval elmid beetles and hydropsychid caddisflies were dominant in riffles. A substantial component of the fauna from each habitat within a reach was unique to that habitat, but there was always a similar number of taxa common to all habitats. Classification and ordination grouped samples from both rivers firstly by habitat and secondly by month and reach. Total density and family richness of invertebrates differed by reach, habitat and month in both rivers, except for richness in the Mersey River where habitat was not significant. Differences in densities and numbers of invertebrate families among habitats were not consistent between reaches for each river. This study has highlighted the differences in macroinvertebrate assemblages of several littoral habitats in two lowland rivers in Tasmania. Differences in taxonomic composition, density and richness among habitats within reaches strongly imply the uniqueness of these habitats in terms of the invertebrate faunas that occupy them. We suggest that if maintenance of biotic diversity is an aim of instream flow management, water allocations that address low flows should place a high priority on the maintenance of a diversity of habitats.     

暗河发育区岩溶隧道突涌水洪峰流量估计

地下暗河是岩溶隧道建设与运营重大的安全风险,暗河发育区岩溶隧道突涌水洪峰估计是岩溶隧道施工抢险与后期处治方案制定的重要基础数据。地下暗河洪峰流量不仅由岩溶区水文地质条件控制,而且还受到暴雨期地表径流补给的影响。本文结合实测数据和统计数据,围绕小流域暴雨资料推求出地表汇流洪峰和地下暗河汇泄流洪峰,提出了一种考虑地表径流补给的暗河发育区岩溶隧道突涌水洪峰估计方法,并结合翠屏隧道的地形地貌、水文地质与实测涌水资料,开展了案例分析计算并比较实测涌水量。表明传统涌水预测方法无法考虑暗河与地表水补给的影响,与实测结果差距很大,本方法能够较好预测岩溶区因地表汇水补给暗河发育区隧道突涌水洪峰,为隧道防洪护堤高度、涵管过水容量设计、洪峰避险时间提供重要支撑,保障隧道施工与运营安全。     

大坝下游河道水温变化规律及其影响

以汉江凡口水库为例,讨论了河流上建坝以后下游河道的水温变化情况及其对周围环境正负两方面的影响。根据实测资料,以附近天然河道的水温为主要因子,建立了河道主要断面的水温预测方程。     

建筑给排水系统中噪声的产生机理及控制

针对目前备受人们关注的建筑物中的噪声问题,从建筑给排水系统中噪声产生原因,传播机理及危害等来展开论述,并对不同的产生源提出相应的控制对策.