淮北市城市污水管网的建设与管理初探

城市污水管网随着城市建设的发展逐步形成,但城市污水管网的建设与管理仍受到经济发展及管理水平等因素的制约。本文根据淮北市污水管网建设与管理情况,对淮北市污水管网存在的问题及加强污水管网的建设与管理进行阐述,以便污水管网能真正发挥其保护境、造福人民的作用。     

试析污水处理系统污水主干管及泵站工程设计优化

结合某市区污水处理系统厂外管网及泵站的设计优化,探讨了污水主干管制设计原则,并根据该原则,确定了污水管网截流倍数和管网布置方案.污水泵站采用潜水泵,采用等离子除臭技术.     

污水管网中雨水混接来源的高效诊断方法

污水管网中雨水混接不仅会导致雨天污水厂运行受到影响,而且产生管网污水冒溢.针对在大范围污水管网中同步安装管道流量计识别雨水混接点位难以操作的问题,提出了基于管网节点水质特征因子监测的低成本雨水混接来源诊断技术方法.具体以总氮和电导率分别作为指示生活污水和雨水的特征指标,并结合污染源地理信息系统、管网节点化学质量平衡和入流水质特征因子浓度数据库,有效解析污水管网中各管段的旱天入流水量和雨天雨水混接量.对安徽省巢湖市城区污水管网雨水混接来源的解析证明了该方法的可靠性,提出了雨水入流来源解析的基本原则.     

改进单亲遗传算法应用于污水管网的布局优化

从污水有向网络图出发,以污水管网系统初投资最小为目标,结合图论理论知识,应用改进单亲遗传算法求解污水管网布局的最优形式．同时设计了相应的适应度函数、基因重组算子和逆转算子,给出了管网水力参数计算的优选思路．     

浅谈污水管网建设管理中的问题及安全保护措施

随着我国对水环境质量要求的提高,污水处理事业发展到一个崭新的阶段,污水管网开始逐渐成为市政排水系统和城市基础公共设施的重要组成部分。本文分析了污水管网建设中出现的问题并应用工程管理方法强化过程化管理,并重点阐述了在污水管网建设过程中如何加强对污水管以外的地下管线的保护。     

基于遗传算法的开封杏花营组团污水管网优化设计

应用遗传算法进行了杏花营组团污水主干管网的优化设计,所得最优设计方案的管网费用仅为按传统水力计算所确定的初步设计方案的74％,可节省大量工程投资．将传统的污水管网水力计算方法与新型的遗传算法有机融合进行污水管网优化设计,能有效提高工程设计效率和设计质量,值得在工程实际中加以推广应用．     

基于特征因子的排水管网地下水入渗分析方法

采用基于水质特征因子的雨污水管网化学质量平衡方程,建立了污水管网和混接污水管网的地下水入渗量定量分析方法,并据此建立了管道破损程度的评价方法.针对上海市中心城区的3个排水系统,采用总氮和硬度分别作为表征生活污水和地下水的水质特征指标,并采用不确定性分析理论,对该区域雨污水管网系统的地下水入渗量进行了解析.计算结果表明,管道破损不严重,地下水入渗量符合设计要求,管网破损程度评估结果符合预期管道状态;表明提出的基于水质特征因子的地下水入渗量的分析计算方法可行,可用于管网破损和维护判断.与德国和美国标准相比,我国排水管道地下水入渗基准值较高,表明我国管道施工和养护技术有待进一步提高.     

江西南部某市排水工程设计

该设计是江西南部某市的排水工程设计,设计主要分排水管网和污水处理两部分.排水管网采用分流制,分污水管网和雨水管网两部分.考虑地势与经济等因素,污水管网采用截流式布置,雨水管网采用正交式布置.污水管网采用两个方案,从技术、经济方面进行比较选择优先方案.污水处理厂的设计以近期的最大污水量(Q=96630 m3/d)为设计标准,污水处理厂的排水水质达到二级排放标准,即SS、BOD5排放浓度分别为30 mg/L、30 mg/L.     

城市污水管网系统优化之我见

城市污水管网是现代化城市不可缺少的重要基础设施，其在市政与环境工程建设中所占总投资的比例很大。对污水管网进行优化设计，寻求满足各种技术条件，且能使整个系统的敷设或运营费用最低的设计方案，不仅具有重要的理论和应用价值，而且具有明显的经济和社会效益。本文首先介绍了污水管网建设的重要意义和我国城市污水管网建设的现状；最后，针对我国污水管网建设存在的一些问题提出几点建议。     

分形学理论在城市排水管网中的应用研究

目的把分形学中的基本理论知识以及水系地貌分形学中的理论成果应用到排水管网研究中来,为排水管网的规划和定线提供全新的思路,使管网的设计更为合理。方法主要采用网格维数计算方法,应用基于分形理论的网络覆盖评价指标——分形维数,编制网格维数计算程序,计算其分形维数。结果雨水管网分维值普遍大于污水管网分维。结论西安市雨水管网的覆盖度大于污水管网;西安市雨水管网覆盖情况从大到小为南郊北郊东郊西郊;污水管网覆盖情况排序为南郊西郊东郊北郊。     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

Features of Women's language

Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women＇s language from these perspectives： pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women＇s language, more attention should be paid to language use in social context. What＇s more, the linguistic phenomena in a speaking community can be understood more thoroughly.     

An Analysis of Catherine＇s Character——Wuthering Heights

Wuthering Heights, Emily Bronte＇s only novel, was published in December of 1847 under the pseudonym Ellis Bell. The book did not gain immediate success, but it is now thought one of the finest novels in the English language. Catherine is the key character of this masterpiece, because everybody and everything center on her though she had a short life. We can understand this masterpiece better if we know Catherine well.     

Lower Paleozoic oil relationships within Williston Basin, Canada

The Williston Basin is a significant petroleum province, containing oil production zones that include the Middle Cambrian to Lower Ordovician, Upper Ordovician, Middle Devonian, Upper Devonian and Mississippian and within the Jurassic and Cretaceous. The oils of the Williston Basin exhibit a wide range of geochemical characteristics defined as "oil families", although the geochemical signature of the Cambrian Deadwood Formation and Lower Ordovician Winnipeg reservoired oils does not match any "oil family". Despite their close stratigraphic proximity, it is evident that the oils of the Lower Palaeozoic within the Williston Basin are distinct. This suggests the presence of a new "oil family" within the Williston Basin. Diagnostic geochemical signatures occur in the gasoline range chromatograms, within saturate fraction gas chromatograms and biomarker fingerprints. However, some of the established criteria and cross-plots that are currently used to segregate oils into distinct genetic families within the basin do not always meet with success, particularly when applied to the Lower Palaeozoic oils of the Deadwood and Winnipeg Formation.     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.     

Design and analysis of generic LBS application developing platform

Location based services is promising due to its novel working style and contents.A software platform is proposed to provide application programs of typical location based services and support new applications developing efficiently. The analysis shows that this scheme is easy implemented, low cost and adapt to all kinds of mobile nework system.     

橡胶颗粒沥青混合料低温抗裂性试验研究

以AC-13级配为基础,将橡胶颗粒代替部分集料掺入混合料中,以低温弯曲试验为评价方法对不同橡胶颗粒掺量下沥青混合料的低温抗裂性进行研究,并引入应变能密度值对混合料的低温抗裂性进行综合评价.试验结果表明:橡胶颗粒沥青混合料试件的破坏微应变均超过2 300,满足冬寒区的技术指标;无论是否掺加橡胶颗粒,随着温度的下降,沥青混合料破坏时的最大弯拉强度增大,弯拉应变降低,劲度模量增大;弯曲应变能密度在胶粒掺量为1%左右时具有较大的弯曲应变能密度值,此时橡胶颗粒沥青混合料具有较好的低温抗裂性.     

Achieving Unusual States of Matter Under High Pressure

正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula-     

Exchange-Correlation and Electronic Excitation Energies from Pairing Matrix Fluctuations

We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re-