黔江区小南海湖水不同季节的磷形态分布特征

为研究小南海不同区域表层湖水中磷形态含量、磷形态分布及季节变化特征,分别于2013年8月(丰水期)、12月(平水期)和2014年2月(枯水期)连续监测小南海湖水中不同磷形态含量与水质参数之间的相关性和湖水综合营养状态进行详细分析。研究结果表明:小南海湖水在不同季节的总磷(TP)都以溶解态(DTP)为主要存在形式,溶解态(DTP)以DP为主要组成成分,TP和DTP含量均呈现枯水期>丰水期>平水期的季节变化特征,DP含量呈现丰水期>平水期>枯水期的季节变化特征。小南海湖水中PP形态磷与电导率和DO呈极显著正相关,DP形态磷与p H呈极显著正相关,其余形态磷和现场测定参数无显著相关性。小南海湖水5号点位区域TP的浓度呈增长趋势,小南海湖水为中营养状态,总体水质较为良好。     

大沙河水库饮用水源现状与对策研究

水体富营养化是供水水库最主要的水质问题.本文简要地分析了大沙河水库作为开平城市供水厂饮用水水源地的基本情况,并通过水库周边环境的污染情况调查和水库水体的水质评价,提出水库饮用水源保护的一些措施和设想.     

饮用水源地水体有机物污染研究现状

概述了水体有机物污染研究现状,阐述了我国饮用水源地水体有机物污染状况,并且分析了水体有机物污染对人体健康的危害,指出了今后饮用水源地水体有机物污染的研究重点.     

慈溪市饮用水源地环境安全评价与保障对策

慈溪市饮用水源地全部来自本地水库.水库水量主要靠地表径流补充,已不能满足社会用水需求.确保水库环境安全显得尤为重要.评价了该市饮用水源地水质安全状况及其变化趋势,结果表明,所有水源地水质年平均值处于安全水平,但一些指标(主要是有机污染物和大肠菌群)在个别时段超标,富营养化问题较为突出.近5年水质总体上无明显变化,个别水源地富营养化程度有所上升.在污染源调查的基础上,提出了水源地污染治理和生态建设对策.     

慈溪市上林湖水质评价及沉积物污染特征

对慈溪市饮用水源地上林湖水质和底泥污染调查研究表明,上林湖饮用水水源地的水质已从2级安全水平降到了3级基本安全水平.上林湖沉积物中总磷的含量约302mg/kg,其中有机磷占31.6%,无机磷占68.4%;沉积物中活性磷含量较高,主要以Fe-P为主,在外力扰动条件下易于向水体释放影响水质.湖区周边杨梅林地施肥土壤中速效磷...     

如皋市饮用水源地水质评价与安全保障措施探讨

介绍了如皋市饮用水源区的区划及水厂建设概况,根据如皋市水体受污特征,以pH值、氯离子等作为评价因子,对如皋市饮用水源地和水厂取水水源地近三年水质监测结果进行了评价.结果表明:如皋市境内长江水质较好,三年来均能达标,而内河饮用水源地的水质不容乐观,三年来,达标率仅为51%.分析了水源地的安全隐患,提出了安全保障与保护措施,为水源地的保护和治理提供了依据.     

平潭县三十六脚湖水环境问题及周边工程治理对策浅析

平潭三十六脚湖是平潭县唯一的饮用水源地。介绍三十六脚湖饮用水源地水环境现状,针对水质日益恶化的情况,提出定时清淤、周边生态氧化塘工程治理等有效措施。     

天津滨海新区集中式饮用水源地半挥发性有机物污染调查研究

通过对天津市滨海新区集中式饮用水源地的水体进行测定,指出滨海新区集中式5个饮用水源地有半挥发性有机物3大类16种物质,水体中SVOC物质的平均含量在国内处于中等污染水平,根据这一检测结果提出了建议。     

郑州市饮用水源地水质分析和现状评价

目的：以郑州市主要饮用水源地——花园口源厂和邙山提灌站为对象,通过对其水质监测、分析与评价,研究其水质变化规律,为有针对性地保护饮用水源,进一步改善水质,优化水源管理提供科学依据。方法：按照《地表水环境质量标准基本项目分析方法》附表4～6所要求的监测分析方法和其他国家标准监测分析方法进行监测分析。用污染指数评价法对地表水水质进行评价。结果：地表使用水源地花园口水源厂和邙山提灌站水质郝为尚清洁。两地表水饮用水源地富营养化程度均为中营养,饮用水源地水质均达标。     

浙江省某市饮用水源地水质评估浅析

饮用水源保护直接关系到广大人民群众的身体健康,关系到国民经济社会的可持续发展,关系到国家的长治久安。该文对浙江省某市梁辉水库、陆埠水库饮用水源地进行全面调查,完成资料收集与整理,完成饮用水源地调查与评估数据库录入工作,了解水源地环境基础信息、水质状况及影响饮用水水质主要因素,简要分析了饮用水源地环境、污染状况、环境监管与环境风险状况,提出环境保护对策建议,为政府管理决策提供依据。     

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.     

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-     

Density Functional Theory for the Response of Periodic Systems to Electric Fields Based on the Vector Potential Approach

正The electronic and nuclear(structural/vibrational)response of 1D-3D nanoscale systems to electric fields gives rise to a host of optical,mechanical,spectral,etc.properties that are of high theoretical and applied interest.Due to the computational difficulty of treating such large systems it is convenient to model them as infinite and periodic(at least,in first approximation).The fundamental theoretical/computational problem in doing so is that