牛栏江—草海补水与西园隧洞协同运行方案研究

滇池草海是昆明城区居民休闲娱乐的重要场所和城市名片。为加快草海水体循环与交换、提升湖区水环境质量,近期陆续实施了牛栏江—草海应急补水工程、新老运粮河水体净化生态工程、海埂大堤水体置换通道工程和西园隧洞工程,为草海环湖截污和清污分流提供了必要的水资源条件,实现了湖区清污水的分向流动,缩短了清流区水体的换水周期。工程协同运行结果表明：草海清流区水质与牛栏江来水状况线性相关性显著,TP浓度主要受牛栏江来水影响与控制,TN浓度受入湖河流水质影响显著;清流区水质浓度与西园隧洞工程排水量相关性显著,并随着排水量增加呈现明显的改善趋势;牛栏江—草海补水工程适宜的补水规模为3.0 m3/s,在通过海埂大堤水体置换通道排水维持湖面良好水景观的同时,牛栏江来水应尽可能通过西园隧洞出口排水,以便最大程度地发挥草海各项水污染治理工程的综合效益。     

浅析影响股东财富最大化目标实现的几个因素

股东财富最大化目标充分考虑了货币时间价值和风险,避免了企业在管理上的片面性和短期行为.但企业在实现股东财富最大化过程中还存在很多影响因素,主要有:激励与约束"双重软化",企业的监督、监管不力和信息披露机制不健全.针对这些影响因素,提出下列建议:建立完善的激励机制;强化企业的内外部监督、监管力度:强化监事会的内部监督作用,建立和完善独立董事制度,加强审计独立性、加强对企业的监管等.     

Uncertainty,opportunistic behavior,and governance in construction projects: The efficacy of contracts

Uncertainty makes exchanges subject to substantial opportunistic behavior that is generally believed to be curbed by the contract. However, how the contract governs the relationship between uncertainty and opportunistic behavior has not been elaborated. This paper examines the effects of uncertainty on the supplier's opportunistic behavior and the moderating effects of contractual complexity. This research classifies uncertainty into environmental uncertainty and behavioral uncertainty and distinguishes contractual complexity from a functional perspective, with elements including control, coordination and adaptation. Using data from 220 owners and general contractors in the Chinese construction industry, this research reveals that a positive relationship exists between uncertainty and opportunistic behavior. Contractual control and adaptation have effects on weakening the relationship between environmental uncertainty and opportunistic behavior, while contractual coordination can mitigate the opportunistic behavior induced by behavioral uncertainty. These findings offer new insights into uncertainty management and a nuanced understanding of contractual governance in projects.     

Synthesis,structures and properties of Cu and Cd complexes with 1,10-phenanthroline

Three new Cu and Cd complexes, namely [Cu(phen)(isca)(EtOH)] (1)，[Cu(phen)₂(HCOOH)] (2) and [Cd(phen)Cl₂](3) (phen = 1, 10-phenanthroline, isca = isophthalic acid) have been synthesized, which are characterized by elemental analysis, infrared spectrum and x-ray crystal diffraction. While strong hydrogen bonds play central roles in the formation of the 3D structure, the combined influence of the weak interactions such as C-H···O bonds, C-H···π and lone pair···π interactions are also evident in the structures. The preliminary investigation on the thermal and fluorescence property of the complexes are presented.     

计算机模拟在数学教学中的应用研究

伴随科学技术的进一步发展,电子计算机技术对人们生活的各方面都产生了深刻而巨大的影响,计算机技术尤其是计算机模拟也在数学领域得到广泛应用。本文阐述了计算机模拟在数学教学中的作用,运用计算机模拟教学,不仅可以加深对概念的理解,而且有助于提高学生对数学学习的兴趣和效果。随着科学技术的发展,计算机将成为数学学习和研究的一个不可或缺的强有力的工具。     

煅烧工艺对TiO_2-白炭黑光催化材料性能的影响

以白炭黑和TiCl4为原料,利用低温水解沉淀方法在白炭黑载体表面负载纳米TiO2,采用煅烧工艺将白炭黑负载的纳米TiO2复合粉体进行晶化,并对煅烧后的复合粉体进行晶体结构和光催化性能的表征。结果表明,700℃煅烧2 h得到的样品,在200 W高压汞灯的照射下,35 min时对罗丹明B的脱色率达到96.23%。     

浅谈通用变频器与交流电动机的匹配

0引言 在我国使用的各类电动机中,80％以上为220kW以下的中小型异步电动机,占我国发电量的60％左右。在世界能源紧张、能源费用高涨的今天,交流变频调速技术是节约能源的重要手段之一。目前,     

液晶显示器颜色计算方法的探讨

显示器颜色的准确性是保证印刷质量的重要因素。对显示器进行色彩管理的主要任务就是计算显示的颜色,即确定RGB颜色控制数值与显示颜色的CIE色度值之间的转换关系。本文对EIZO、苹果和普通液晶显示器的颜色进行了测量,分别用增益-偏置-伽玛(GOG)模型、双通道干扰(TPC)模型和分段分空间(PP)模型进行显示颜色的计算,检验各模型的计算精度。实验中将RGB数值均匀分割为9个区间,总共组成729个检验颜色,将计算颜色与颜色测量值进行比较,分析GOG模型、TPC模型和PP模型对三种显示器计算的CIELAB色差,对计算结果进行分析,从而寻找对显示器颜色模型的改进方法。