改性木屑处理含Cr（VI）废水的研究

通过正交试验选择制备改性木屑的最佳条件，水解改性后的木屑能将Ｃｒ（Ⅵ）还原成Ｃｒ＾３＋，每克改性木屑对Ｃｒ（Ⅵ）的最大还原能力为４９０ｍｇ。将其装成柱子，让ρＣｒ（Ⅵ）＝ｍｇ／Ｌ及ｐＨ＝２的含Ｃｒ（Ⅵ）电镀废水通过柱子，其接触时间不小于６ｍｉｎ，Ｃｒ（Ⅵ）的还原率在９９．５％以上。     

水中痕量Cr(Ⅵ)的流动注射-分光光度测定

研究建立了测定水中痕量Ｃｒ（Ⅵ）的二苯基碳酰二肼（ＤＰＣ）－流动注射分光光度法,将含Ｃｒ（Ⅵ）水样注入到Ｈ２ＳＯ４溶液和ＤＰＣ溶液的混合流中,在λｍａｘ＝５４０ｎｍ处对反应形成的紫红色Ｃｒ（Ⅱ,Ⅲ）－二苯基偶氮碳酰肼蝥合物进行分光光度检测．线性范围为０．０３～１．６０ｍｇ／ＬＣｒ（Ⅵ）,检测限为０．０１４ｍｇ／Ｌ,测定频率为１００次／ｈ．本法灵敏度高、选择性好、分析速度快．用本法测定工业废水中痕量Ｃｒ（Ⅵ）,获得满意结果     

微量钒的停流流动注射－动力学光度法测定

依据Ｖ（Ⅳ）－Ｃｒ（Ⅵ）反应对Ｃｒ（Ⅵ）－Ⅰ－氧化还原反应的诱导，以淀粉络合物为指示剂建立了一种测定微量钒的停流－诱导动力学光度法．线性范围为０～１．８ｍｇ／Ｌ，方法检测限为０．００８ｍｇ／Ｌ．除Ｆｅ２＋、Ｓｂ３＋外，大部分共存离子不影响测定．测定了土样中钒含量，结果满意．     

5''''-硝基-水杨基荧光酮-氯代十六烷基吡啶荧光熄灭法测定痕量Cr(Ⅵ)

基于Ｃｒ（Ⅵ）－５′－硝基－水杨基荧光酮（５′－Ｎ－ＳＡＦ）－氯代十六烷基吡啶（ＣＰＣ）体系的荧光熄灭效应，提出一种测定痕量铬（Ⅵ）的新荧光分析方法．ｐＨ在４．５～５．５范围内的柠檬酸—氢氧化钠缓冲溶液中，在ＣＰＣ存在下，Ｃｒ（Ⅵ）与５′－Ｎ－ＳＡＦ形成摩尔比为１２的配合物，配合物的激发波长和发射波长分别为：λｅｘ１＝４７５ｎｍ，λｅｘ２＝５０５ｎｍ，λｅｍ＝５２５ｎｍ．Ｃｒ（Ⅵ）浓度在０．８～５０μｇ／Ｌ范围内与ΔＦ呈良好的线性关系，相关系数ｒ＝０．９９９２，检测限为０．８μｇ／Ｌ．本法灵敏度高，选择性好，适用于水样、人发中痕量Ｃｒ（Ⅵ）的直接测定     

褐煤腐植酸对Cr（Ⅵ）离子吸附物性试验

采用云南寻向褐煤撮提取的腐植酸对Ｃｒ（Ⅵ）溶液进行吸附性能试验，发现ｐＨ值在４～５范围时，该腐植酸对Ｃｒ（Ⅵ）的最大吸附量可达３５．３０ｍｇ／ｍ。     

Cr(Ⅵ)氧化5-溴水杨基荧光酮光度法测定微量Cr

在硫酸介质中,Ｃｒ（Ⅵ）将５－溴水杨基荧光酮（５－ＢＳＡＦ）氧化成最大吸收峰为４９４ｎｍ的有色产物,其表观摩尔吸光系数为３．６７×１０４Ｌ／（ｍｏｌ·ｃｍ）,Ｃｒ（Ⅵ）量在０～１５ｍｇ／２５Ｌ范围内服从比耳定律。用此法测定了电镀废液中微量Ｃｒ,回收率为９８．５％～１０３％,相对标准偏差为２．６％     

非晶态铬电镀溶液的电极过程

用Ｎｉ，Ｃｕ，Ｆｅ和玻璃碳电极，研究了非晶态铬电镀过程中Ｃｒ（－Ⅵ）还原为Ｃｒ（Ⅲ）的电化学特征，发现Ｃｒ（Ⅵ）还原为Ｃｒ（Ⅲ）的电势与电极材料密切相关，在金属电极上还存在着新相的形成和生长过程，新相形成主要是钝化膜中的铬离子还原为金属铬，这为后继的铬电沉积提供了晶体生长中心的过程。     

5′—硝基—水杨基荧光酮—氯代十六烷基吡啶荧光熄灭法测…

基于Ｃｒ（Ⅵ）－５′－硝基－水杨基荧光酮（５′－Ｎ－ＳＡＦ）－氯代十六烷基吡啶体系的荧光熄灭效应，提出一种测定痕量铬的新荧光分析方法，ＰＨ在４．５－５．５范围内的柠檬酸－氢氧化钠缓冲溶液中，在ＣＰＣ存在下，Ｃｒ（Ⅵ）与５′－Ｎ－ＳＡＦ形成摩尔比为１：２的配合物，配合物的激发波长和发射波分别为：λｅｃ１－４７５ｎｍ，λｅｘ２＝５０５ｎｍ，λｃｍ＝５２５ｎｍ，Ｃｒ（Ⅵ）浓度在０．８－５０μｇ／Ｌａｉｌ     

Cr（Ⅵ）的新富集剂──三聚氰酰胺甲醛树脂

天然水和工业废水中微量的铬Ｃｒ（Ⅵ）可以通过与三聚氰酰胺甲醛树脂的交换而被富集．本文研究了Ｃｒ（Ⅵ）的直接富集方法，并对Ｃｒ（Ⅵ）的富集能力、富集酸度、及回收率作了讨论．     

离子交换火焰原子吸收法测定水中Cr(Ⅲ)和Cr(Ⅵ)

研究了在ｐＨ＝２～３的条件下，用国产００１＃强酸性阳离子交换树脂、２０１×７＃强碱性阴离子交换树脂对水中Ｃｒ（Ⅲ）和Ｃｒ（Ⅵ）进行交换吸附，在Ｎａ２ＳＯ４存在下，用火焰原子吸收法直接测定交换后溶液中的Ｃｒ（Ⅵ）和Ｃｒ（Ⅲ）。方法简便易行，快速，特征质量为０．０７２μｇ／ｍＬ，相对标准偏差为２．７％，回收率为９５％～１０６％     

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