城市二次供水系统水质管理模式浅析

国内典型城市开展了二次供水水质管理模式的相关研究,并根据自身特点建立了二次供水水质管理模式。上海市结合自身特点制定了一系列措施加以保障,在水量供应和水质保障方面实行了专业化的操作流程,并制定了相关规范加强监管。     

广东日前电力市场方案设计与市场仿真

回顾了广东省电力直接交易进展情况,参考国外成熟日前电力市场模式,提出了日前市场建设的基本原则,结合广东省电力体制实际情况,设计了全电量竞争的日前市场模式,从交易标的、市场主体、交易时序、交易组织流程、报价机制、交易出清机制、交易执行、交易结算等方面开展了制度设计,并依据广东电网实际数据,对日前电力市场进行了仿真,对仿真结果进行了分析和讨论。     

嘉兴的孔庙

指出了嘉兴城内的三所孔庙分属于嘉兴府及嘉兴、秀水两县,分别对嘉兴府孔庙、嘉兴县孔庙及秀水县孔庙进行了详细介绍,重点对嘉兴府孔庙的规模、格局等进行了阐述,以帮助人们更好地了解嘉兴的孔庙文化。     

Defining standard skies for Hong Kong

A CIE International Daylight Monitoring Programme (IDMP) general class station was established in 2000 at the Chinese University of Hong Kong. The station was upgraded to Research Class IDMP Station in April 2003. The study, which includes the sky luminance scan data collected from April 2003 to May 2005, firstly fits the data to the CIE Standard General Sky definitions, which consist of 15 luminance distributions for modeling the sky from the heavily overcast sky to cloudless clear sky. Then the paper proposes a reduced set of CIE general skies (and their probability of occurrence) to represent the sky conditions of Hong Kong. This reduced set will be known in this paper as “Hong Kong Representative Sky” (HKRS). Further, the paper evaluates the sensitivity of vertical sky component (VSC) to differences between the HKRS and the standard CIE Overcast Sky model. Comparing with observed data, it is demonstrated that the HKRS could give better results. A reduction in error of approximately 20–40% could be expected, depending on the orientation of a surface. Using the HKRS, building designers could better predict daylight availability of their design. Energy saving and more sustainable buildings might result.     

软土地基上满堂支架现浇桥梁上部结构施工技术

文章介绍了马(鞍山)芜(湖)高速芜湖东互通立交工程的工程特点,分析了地基处理、预应力体系安全、防止芯模上浮等施工要点,阐述了软基上预应力连续箱梁及连续空心板满堂支架法现浇施工技术。     

有限元计算砌体结构温度效应时的参数取值

砌体结构中由温度应力引起的温度裂缝问题一直没有得到很好的解决。有限元是计算温度应力的很好方法 ,但是对于计算中所需的温度参数取值并没有统一的标准。在参考已有温度参数取值方法的基础上 ,提出了既考虑年温差又考虑日温差的组合温差取值方法 ,并将这一方法应用于混凝土空心小砌块试点建筑的温度应力计算。通过计算 ,证明这一方法是合理的。     

匀质化方法在砌体结构地震反应分析中的应用

利用匀质化方法,得到一个三层砌体结构等效体积单元的各力学参数,再运用ANSYS软件对该砌体结构进行了地震反应模拟。最后把计算结果与试验结果进行了对比,二者基本吻合,说明采用砌体匀质化方法进行非线性分析是合理可行的。     

In situ ophthalmic gel of ciprofloxacin hydrochloride for once a day sustained delivery

This article focuses on preparation and evaluation of a once a day ophthalmic delivery system for ciprofloxacin hydrochloride based on the concept of pH-triggered in situ gelation. The in situ gelling system involves the use of polyacrylic acid (Carbopol® 980NF) as a phase transition polymer, hydroxypropyl methylcellulose (Methocel® K100LV) as a release retardant, and ion exchange resin as a complexing agent. Ciprofloxacin hydrochloride was complexed with ion exchange resin to avoid incompatibility between drug and polyacrylic acid. The developed formulation was stable, and nonirritant to rabbit eyes and in vitro drug release was found to be around 98% over a period of 24 hours.     

尾矿物理性质代表参数的研究

尾矿的物理性质是影响尾矿坝安全稳定性的重要因素。目前描述尾矿物理性质的参数较多,但经济性和实用性较差。本研究运用数理统计方法,深入研究尾矿各物理性质参数间的相关性,根据相关程度将尾矿物理性质参数分为3类,第1类组合为孔隙比、含水量、压缩系数;第2类组合为压缩模量、土粒比重、干密度、湿密度;第3类组合为固结系数、渗透系数、不均匀系数、限制粒径、有效粒径。根据同类指标相关系数平均值得出各分类参数的代表值为孔隙比、湿密度和渗透系数。该成果揭示了尾矿物理性质参数的本质联系,对尾矿坝稳定性分析时物理参数的选取具有指导意义。     

核电厂气载放射性物质取样和监测标准分析

本文对比分析ISO 2889—2010和ANSI N13.1—1999中核电厂气载放射性物质的取样和监测要求,同时结合国内核电厂烟囱中气载放射性物质取样和监测现状,讨论了新标准执行的难点。分析结果给出了在新标准的应用中,目前烟囱气载放射性物质取样与监测设计需关注的几点。