南湾水库饮用水源保护区浮游藻类污染及其防控对策研究

在南湾水库一、二级饮用水源保护区水上边界处进行取样,检测、分析水中浮游藻类动态,并进行水质卫生评价,发现浮游藻类总数、藻类类别总数及优势藻类属总数的时间变化均比较明显,浮游藻类在5—10月间繁殖比较旺盛．卫生评价表明,浮游藻类污染给饮用水带来潜在风险的时间不低于半年,6月、9月存在蓝藻污染风险;需要加强对南湾水库汇水流域污染源控制、生态环境保护以及水环境监测,适时冲排水库淤积物,优化自来水厂净水工艺,保障饮用水水质安全．     

乌江流域某水库浮游藻类群落结构及多样性分析

浮游藻类在河流生态系统中发挥着重要的生态功能.为探明乌江流域不同梯级水库中浮游藻类的种群结构特征,采集了乌江流域某水库水深分别为0,10和45 m的水样过滤膜分层样本,利用两对浮游藻类通用简并引物对水样进行23S rRNA基因扩增、扩增片段建库和高通量测序分析.通过对两对引物获得的浮游藻类种群覆盖度比较,选择出了相对高...     

几种浮游单细胞藻类磷代谢的初步研究

用３２ＰＯ４３－同位素稀释法研究了单种一次培养的几种浮游单细胞藻类的磷代谢．小球藻（Ｃｈｌｏｒｅｌｌａｓｐ．）和一种绿藻对ＰＯ４３－的最大吸收速率（Ｖｍａｘ）与细胞磷含量成负相关，半饱和速率常数（Ｋｓ）与藻类的种类相关．光照与黑暗对中华盒形藻（ＢｉｄｄｕｌｐｈｉａｓｉｎｅｎｓｉｓＧｒｅｖｉｌｅ）和金藻（Ｄｉｃｒａｔｅｒｉａｓｐ）ＰＯ４３－的吸收和再生代谢无明显影响，其昼夜变化是藻类细胞新陈代谢的反映；处于细胞周期Ｇ１期与Ｓ期的藻类有较高的磷吸收和再生代谢速率，而Ｇ２期与Ｍ期的磷代谢速率较低．藻类磷代谢的动力学及其昼夜变化是围绕着对营养盐磷最大程度地利用和维持藻类持续生长的机制展开的．     

河南省南湾水库浮游藻类的演替特征研究

南湾水库对区域经济和社会发展具有重要影响。研究其浮游藻类的演替特征对保护生态环境、促进区域可持续发展具有重要意义。本文取样调查、研究了2008年2月-2009年1月间南湾水库浮游藻类的演替,发现：空间上,浮游藻类总数在同一时间的水库不同区域样点之间呈现数量级上的差距,大部分样点仲春一秋末期间藻类总数在10^3个／L数量级以上;时间上,藻类总数在4月中旬-10月中旬期间较高,春季高于秋季,冬季最少。中、晚秋、冬、春季以绿藻、硅藻为主,夏季一早秋以蓝藻、绿藻为主。南湾水库浮游藻类演替在自然背景基础上,叠加了人为因素的深刻影响。     

太湖湖水及沉积物磷释放对藻类生长潜力研究

在太湖湖水中添加不同的氮、磷营养物进行藻类生长潜力测试，试验结果表明：单独添加ＨＰＯ２－４和同时添加ＨＰＯ２－４、ＮＯ－３的所有浓度组均能显著促进斜生栅列藻（Ｓｃｅｎｄｅｓｍｕｓｏｂｌｉｑüｕｓ）和羊角月芽藻（Ｓｅｌｅｎａｓｔｒｕｍｃａｐｒｉｃｏｒｎｕｔｕｍ）的增长，而单独添加ＮＯ－３和ＮＨ＋４对二种藻类不但均无促进、并有一定抑制作用，表明了磷是太湖藻类生长的限制因子。在所试验条件下，厌氧状态（ＤＯ为０～２．５ｍｇ／Ｌ）下沉积物释放后滤液能促进斜生栅列藻增长，但对羊角月芽藻无促进效应；好氧状态下（ＤＯ为７．５～８．０ｍｇ／Ｌ）沉积物释放后滤液均不能促进二种藻类增长。     

大庆湖泡浮游藻类资源调查及营养状况研究

对大庆市大龙虎泡、红旗水库、黑鱼泡、东湖水库不同水体进行了浮游藻类的采集及分类鉴定;利用浮游藻类的生物量、优势种以及藻类群落组成等指标评价了水质。结果表明:四水体有浮游藻类6门,即硅藻门、绿藻门、蓝藻门、裸藻门、黄藻门、甲藻门;四水体的优势种均为硅藻门、绿藻门、蓝藻门,水体均出现富营养化。根据研究结果,应对四水体采取相应的治理措施以改善水体富营养化状况。     

厌氧─好氧一体净化器处理生活污水的研究

研究了厌氧─好氧一体化污水净化装置处理生活污水的启动及运行特性，试验表明装置在自接种条件下启动，二周内可达到稳定的处理效果，出水ＣＯＤ＜１００ｍｇ·Ｌ－１．正常运行，ＨＲＴ＞６．２ｈ时，ＣＯＤ去除率大于８５．２％，ＢＯＤ５去除率大于８８．６％，出水水质满足国家的污水排放标准，ＮＨ３—Ｎ在１０．６ｍｇ·Ｌ－１左右．     

声化学氧化-SBR法处理染料废水

采用声化学氧化法作预处理，可使生物难降解的染料废水可生化性ＢＯＤ５／ＣＯＤ值由０．２２～０．２８提高到０．４４～０．５１。再经间歇式活性污泥法（ＳＢＲ）处理后，各项水质指标均符合ＧＢ８９７８－８８《污水综合排放标准》中的一级标准。     

桓龙湖水库生物监测及水质预警

为分析桓龙湖水库水质状况、预测水质变化,对桓龙湖水库2014年枯、丰、平水期四个监测断面浮游藻类生物密度和种类进行监测.三个水期共监测到浮游藻类4门6纲9目16科23属,硅藻门所占比例最大,其次是绿藻门、蓝藻门、裸藻门,水库处于中-富营养状态;监测到浮游藻类在枯水期、丰水期和平水期的平均数量分别为8.97×10~2个/m L、7.90×10~2个/m L、5.55×10~2个/m L,水库处于中营养状态.根据2011—2013年水质历史数据运用SPSS建立了多元非线性回归预测模型;根据模型建立以综合营养指数为预警指标的分级预警方案,对其验证结果表明20组预警结果 90%可信,预警方案基本能够达到要求.     

饭豆铜锌超氧物歧化酶的纯化及性质

饭豆种子粗提液中有６条Ｃｕ·Ｚｎ—ＳＯＤ活性谱带，经氯仿－乙醇混合液处理，硫酸铵盐析，ＳｅｐｈａｄｅｘＧ－１００凝胶过滤和ＤＥＡＥ－纤维素柱层析被分离，获得了两组ＳＯＤ同工酶组分（ＳＯＤ—１，ＳＯＤ—２）．它们在酶分子结构上可能存在一定差异．ＳＯＤ－１含与粗提液相对的、电泳迁移率较小的活性谱带，它在聚丙烯酰胺凝胶电泳（ＰＡＧＥ）图谱上的活性染色带和蛋白染色带相互对在；在ＳＤＳ－ＰＡＧＥ和等电聚焦电泳图谱上均呈现单一区带，说明该酶已纯化到均一程度．该酶分子量为３１３００，亚基分子量为１６５００，等电点为４．２，在紫外区的吸收值为２６４．０ｎｍ．该必在０—７５℃范围内稳定．纯化的ＳＯＤ—１比活性为１７８９Ｕ／ｍｇ，ＳＯＤ—２比活性为２８４Ｕ／ｍｇ，ＳＯＤ活力回收率为３２％．     

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.     

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     

On the Thermodynamic Limit for Responses to Static Electromagnetic Fields

For molecular systems,the quantum-mechanical treatment of their responses to static electromagnetic fields usually employs a scalar-potential treatment of the electric field and a vector-potential treatment of the magnetic field.Although the potential for each field separately is associated with the choice of an(unphysical)origin,the precise choice of the origin for the electrostatic field has little consequences for the results.This is different for the