钦江市区段水质状况和保护对策研究

从2002年到2004年,钦江青年水闸河段水质从Ⅳ类上升为Ⅱ类,达集中式生活饮用水水源地功能要求,化工总厂和横水渡河段水质呈恶化趋势,水质由Ⅳ类下降为Ⅴ类.保护水质的措施有：搞好水生态环境建设;杜绝生活污水及其它污染源进入水体;加强对采沙淘矿和工业排污监控;制定相应政策措施;建立水质预警系统.     

渔洞水库水源地近年水质下降及其原因分析

从1997年以来,渔洞水库水源地水质处于国家地表水Ⅱ—Ⅳ类之间,大部分年份属于三类水质,其中2013年为Ⅳ类水质,达不到国家饮用水标准,已严重威胁着城市居民的饮用水安全.根据多年水质监测资料分析,造成水源不达标主要是总氮和总磷超标,径流区水土流失严重等.本文系统分析水质下降原因,为渔洞水库水环境治理提供决策依据.     

松滋市城区饮用水源地水质现状与保护

以松滋市主要饮用水源地——松滋西河为对象,以近3年的水质监测数据为样本,参照国家或行业水质标准进行比较分析.结果表明:松滋西河水质,2011年、2012年综合评价类别为Ⅲ类;2013年综合评价为Ⅳ类,除去总磷,其它所检项目综合评价仍处于Ⅲ类,说明总磷超标.研究发现:松滋西河水源地水质总体上呈现逐年变差的趋势.因此,为了保护松滋西河水源地的水质安全,从严格水资源管理制度、环保执法监管、生态环境保护、水资源监测、提高水环境保护意识等方面提出了相应的建议.     

用法治向地下水污染宣战

继雾霾天气之后,地下水污染让环境问题再成热点. 从全国范围看,地下水污染状况不容乐观.2000年至2002年,国土资源部曾做过调查,当时,全国地下水资源符合Ⅰ类至Ⅲ类标准的,还有63％.到2009年,经对北京、辽宁等8个省份641眼井的水质分析,水质Ⅳ类至V类的却占到了73.8％.而2011年,全国200个城市的地下水水质监测中,“较差至极差”水质的监测点比例为55％.可见近年来,我国地下水的水质恶化趋势非常明显.     

巢湖水质污染的社会经济因子分析及趋势研究

文章运用灰色关联分析法探讨了2000-2006年间影响巢湖水质的社会经济因子,并采用灰色预测模型对未来五年巢湖水质的污染状况进行了预测.以期为巢湖水污染治理提供新思路.结果表明巢湖COD的排放,主要受流域工业废水排放的影响,其次受农村人口的生活中产生的污水排放的影响;TN主要受农业生产中农药化肥的大量使用的影响;TP主要受城镇、农村人口的生活废水垃圾排泄物的影响.模型预测结果显示未来五年巢湖水质有望好转,但是湖区水质TN、TP指标仍介于Ⅳ～Ⅴ类之间.因此,今后巢湖水质的主要污染物是TN、TP,而农业和城镇、农村人口的生活废水排放将成为污染物的主要来源.有必要采取发展生态农业、控制含磷商品的使用、加强对农村生活污水尽可能的集中处理等措施有效控制巢湖的水质污染.     

渭河宝鸡段水环境质量评价

利用基于熵权信息的模糊物元法对渭河宝鸡段6个断面的水环境质量进行了评价.结果表明:林家村和胜利桥断面水质达到II类地表水环境质量标准;卧龙寺桥、常兴桥和虢镇桥断面水质达到III类地表水环境质量标准;蔡家坡桥断面水质最差,达到Ⅳ类地表水环境质量标准.宝鸡市在渭河水环境保护和治理方面取得了较大成效.     

贵阳市乌当区农村饮用水源水质调查与评价

按照《生活饮用水标准检验方法》(GB/T 5750.1-2006),对乌当区10个典型农村饮用水水源地开展水质调查及分析。结果表明:乌当区农村饮用水源以地下水为主,主要供水方式为分散式;除集中式饮水及个别分散式饮水水源地水质为Ⅱ级,其余为Ⅳ至Ⅴ类水质。结论:乌当区农村多数饮用水源水质较差,仍需加强本地区饮用水源水质的改进及监测工作。     

三峡工程截流后洞庭湖的水质和富营养化变化

该文根据2003-2013年洞庭湖水质监测数据,采用单因子评价法、综合污染指数法和综合营养指数法对洞庭湖的水质及富营养化变化进行分析。结果表明：三峡工程截流十多年来洞庭湖水质以Ⅳ类或Ⅴ类为主。洞庭湖的主要污染指标为总氮和总磷,其浓度值分别高于1.0mg/L和0.05mg/L。湖体水质劣于出湖口水质,出湖口水质劣于入湖口水质。全湖的营养级别为中营养,东洞庭湖在2008-2011年出现了轻度富营养。     

淮南老鳖塘与刘岗塘水体的重金属污染研究

采用原子吸收分光光度法对淮南谢二矿塌陷区老鳖塘与刘岗塘水体中Fe、Pb和Zn等重金属的含量进行了检测。结果表明：老鳖塘与刘岗塘水体中的Fe含量分别超出了集中式生活饮用水地表水源地补充项目标准限值的3倍和5．9倍;两塘水体中的pb含量分别属于地表水环境质量国家标准的Ⅳ类和Ⅴ类水质范畴;Zn的含量均属于地表水环境质量国家标准的Ⅴ类水质范畴。综上可见淮南煤矿塌陷区水体的重金属污染状况较严重。     

水质检测与污染分析--以固原市清水河为例

从PH值、悬浮物、化学需氧量、五日生化需氧量、氨氮等指标对固原市清水河水质进行了检测，将检测结果与国家标准对比分析，检测指标除PH值外都有超Ⅳ类以至超Ⅴ类水质标准情况发生。结果表明清水河已受到土豆粉条、精淀粉加工业、造纸业废水和生活污水的严重污染，亟待加以治理保护。     

卡思卡特城堡

It is worthy of noting that, whilst Crookston Castle witnessed the earlier and happier portion of Mary's variegated life,     

不同的吃喝玩乐

一、吃和喝吃苹果 eat an apple, 吃药 take medicine,吃糖 have some sweets,吃饭 have one's meals,吃馆子 dine out,吃惊 be surprised/     

漏洞百出的教育

Many college freshmen arrive woefully unprepared to do college work, and as disadvantaged populations continue to grow, the share of the American work force that has made it through college is expected to plummet. Many experts blame that educational failure not just on high schools but also on colleges. School & College, a special report by The Chronicle, looks at efforts to fix the system. What reforms would better prepare students for college? What should schools and colleges be doing differently? How should state and federal officials help?     

只要努力,不要后悔

There are numbers of crossroads on our long and unpredictable life journey where we totally have no idea about which direction to choose. No matter what our decision is, we should not turn back, but face the music and go ahead instead. I am this kind of girl who always does try without regretting, one example is how I dealt with my love.     

浅谈移民问题

Migration occurs behind a variety of reasons and has a great effect on the whole world. People may migrate in order to improve their economic situation, or in order to escape civil strife, persecution, and environmental disasters. The impact of migration is complex, bringing both benefits anddisadvantages. This paper briefly talks about the causes of migration, the allocation of benefits, and the ways in which individual countries and the international community deal with this important subject.     

Sister Carrie, an Adherent of Desires

Sister Carrie is one of the most controversial characters in American literature.Thought as a "fallen woman" firstly,she was defined as a "new woman" by some critics later. However, by digging into the motivaton behind the whole process of Carrie's "success", the relationship between Carrie and her creator (the author), the social conditions of then American, it can be found that Carrie has never been free-standing on her thought and she has never found her real-sdf even after becoming a famous actress. In a society dominated by mass consumerism Carrie is only an adherent of her own desires. She also is a representative of all those country girls flooded into cities, a symbol and a sacrifice of the urbanization of America in a time countryside was overcome by cities.     

Improvement of one-cycle controller by use of proportional integral differential controller

1.IntroductionOne-cyclecontrolmethod,whichwasproposedaboutonedecadeago[1],hasbecomeanattractivemethodinspecialfieldssuchaspowerfactorcorrection[2-6],switchingamplifiers[7,8],etc.Themainideaofthiscontrollerisbasedonintegrationofdiodevoltageinone-cycleandforcesittobeexactlyequaltothereferencevalue.Themainadvantageofthiscontrollerisitsrealtimeabilitytorejectthevariationofinputvoltage[1].Despitethisgreatability,ithasnogoodperformancesinrejectingofloaddisturbanceandfollowingreferencecommands.Espec…     

库克斯顿城堡

城堡, 是欧洲典型的建筑之一, 每个城堡都有一个美丽的传说或是一段历史。从本期开始, 我们将推出“城堡之旅”, 带各位读者去浏览、观赏欧洲各地的城堡, 开始一段文化与历史的旅途!     

胡主席在印度,我却在中国

Today, Sunday morning, I sit thinking and typing at my computer. My thoughts are in my homeland, India and my body is in China. The body is here and mind there for a good reason. Mr. Hu is president and I am resident and both are in each other's countries (what a difference the absence of one small letter makes!). Mr. Hu will return in a few days and I will stay on longer.