光化动力学法测定痕量钒

研究在草酸盐离子存在下, 用紫外光照射含铁（ Ⅲ） 溶液, 通过光化学反应产生的铁（ Ⅱ）与溶液中的钒（ Ⅴ） 作用, 采用改进的永停法进行终点检测． 结果表明, 溶液含钒的量与到达检测终点的时间呈良好的线性关系． 据此可以测定试样中钒的含量． 用ＢａＳＯ４ 作共沉淀剂以共沉淀的形式, 把铬（ Ⅵ） 共沉淀以消除其对测定的影响．     

痕量铁的光化学伏安分析新方法研究及应用

在稀硫酸介质中及草酸存在条件下，痕量铁对金芝花橙ＯＯ对光化学褪色反应有较催化作用，在氢氧化钠介质中中，金莲花橙ＯＯ于－０．８０Ｖ处产生一灵敏的２．５次生分极谱波。采用２．５微分极谱法研究了Ｆｅ（Ⅲ）－草酸－金莲茶橙ＯＯ光化学新体系，建立了一个检出限和测定范围分别为０．７ｎｇ／ｍＬ和２ｎｇ／ｍＬ－１００ｎｇ／ｍＬ铁的光学伏安分析新方法，并用于试样分析。     

衬底材料对直接光化学汽相淀积类金刚石碳膜成膜初期的影响

以微波激励氙（Ｘｅ）发射的真空紫外（ＶＵＶ）光作光源,乙炔（Ｃ２Ｈ２）作反应气体,氮（Ｎ２）、氩（Ａｒ）和氢（Ｈ２）气为稀释气体,采用直接光化学汽相淀积（ＣＶＤ）工艺,在硅（Ｓｉ）、钼（Ｍｏ）及玻璃衬底上进行了类金刚石碳（ＤＬＣ）膜的淀积生长。通过光电子能谱（ＸＰＳ）和扫描电子显微镜（ＳＥＭ）的测试与观察,研究了在同样工艺条件下不同衬底材料对ＤＬＣ膜成膜初期碳原子的吸附、凝聚及成核过程。实验结果表     

流动注射催化光度法同时测定铁和钒的研究

基于铁（Ⅲ）和钒（Ⅴ）对溴酸钾氧化维多利亚天蓝Ｂ褪色的催化作用及在不同反应条件下二者催化作用的差异,以反应条件作为化学计量学中的量测通道,应用ＣＰＡ矩阵法对铁（Ⅲ）和钒（Ⅴ）同时测定进行了研究,建立了流动注射催化光度法同时测定铁和钒的方法．在铁（Ⅲ）和钒（Ⅴ）浓度比为１∶２０～４０∶１的范围内,应用该法对其混合物进行测定,回收率分别为９５．５％和１０３．５％．     

过渡金属配合物与卤代烃的光化学反应

本文总结和回顾了 Ａｕ（Ｉ）、 Ｃｕ（Ｉ）、 Ｒｕ（Ⅱ）、 Ｉｒ（０）和 Ｐｔ（Ⅱ）等几个典型过渡金属 配合物与卤代烃的光化学反应,并比较光化学反应的机理．     

苯甲腈类有机污染物在水中光化学降解的研究

以５００Ｗ中压汞灯为光源，对２１种苯甲腈类化合物在水溶液中的光化学降解（下简称光解）进行了研究。结果表明，该类化合物的光解符合一级动力学反应方程，半衰期均小于３５ｍｉｎ。实验证明存在基态电荷转移络合物（ＣｈａｒｇｅＴｒａｎｓｆｅｒＣｏｍｐｌｅｘ，下简称ＣＴＣ），并认为是引起光氧化反应的重要因素。苯环上斥电子取代基、腐殖酸、一些无机盐、酸性或碱性介质、温度等均能加快反应，但吸电子取代基会减慢反应、本文还以日光为光源对几种苯甲腈类化合物在天然水中进行了光解研究，表明光解速率较慢，推测反应主要是水中可溶解有机物（下简称ＤＯＭ）的光敏化所致。     

黑暗中脱水对银杏离体叶片光系统Ⅱ光化学活性的影响

以银杏叶片为材料,研究其在黑暗脱水条件下光系统Ⅱ（PSⅡ）光化学活性的变化。结果表明：在黑暗脱水过程中,银杏叶片的相对含水量（RWC）随时间的延长而下降,PSⅡ的潜在活性Fv/Fo和最大量子效率Fv/Fm的变化趋势相同。PSⅡ反应中心单位面积吸收（ABS/CS）的能量、捕获（TRo/CS）的能量和热耗散（DIo/CS）的能量都呈上升的变化趋势,而用于电子传递（ETo/CS）的能量则呈先上升后下降的变化趋势,说明银杏叶片没有受到明显的光抑制。     

壳聚糖-铁絮凝剂的制备及其絮凝性能

利用无机嵌入有机的方式改性壳聚糖制成壳聚糖-铁絮凝剂,使用高岭土悬浊液对其絮凝性能进行了考察。结果表明,当壳聚糖-铁絮凝剂（CTS-Fe）的投加量为5mg/L,m（CTS）∶m（Fe）=2∶1,pH=7时,絮凝效果最佳,沉降率为88.75%。并对壳聚糖-铁絮凝剂、壳聚糖、聚合氯化铁和壳聚糖-聚合氯化铁复合絮凝剂对高岭土悬浊液的处理效果进行了对比研究。结果表明,壳聚糖-铁絮凝剂的处理效果最好,且用量较少。     

表面接枝二苯甲酮光活性聚合物及光化学固定大分子的研究

采用两步法表面接枝聚合技术,通过热活化脱除偶合半嚬哪醇（BPOH）基团而产生表面自由基,引发二苯甲酮（BP）光活性单体4 甲基丙烯酸二苯甲酮酯（BPMA）与4,4′ 对甲基丙烯酸二苯甲酮酯（DMABP）在聚丙烯膜(CPP)表面进行接枝聚合,将大量光活性BP结构单元引入到膜表面,进一步在UV光辐照下将疏水聚合物聚苯乙烯（PSt）、亲水聚合物聚乙二醇（PEG）及生物大分子牛血清白蛋白（BSA）偶合固定在膜表面。考察了光照时间及引发剂BP浓度对偶合BPOH基团的影响,研究了热引发光活性BP单体表面接枝聚合温度、单体组成对接枝效果的影响,采用UV-Vis光谱、XPS分析及表面水接触角测定表征了表面接枝量及性能变化。结果表明,提高反应温度有利于接枝反应,DMABP反应活性要高于BPMA;固定PSt后,接触角明显增加,表面疏水性增强,固定PEG和BSA后,接触角下降10°~20°,表面亲水性明显提高。     

小儿血液金属元素浓度与血细胞参数关系

目的探讨小儿血铅、镉、铜、锌、钙、镁、铁浓度与血细胞参数的相互关系。方法采用原子吸收分光光度仪、血球计数仪分别对门诊健康体检小儿297人进行金属元素浓度测定与血细胞计数,并以SPSS11．5统计软件对金属元素浓度与红细胞（RBC）、WBC（白细胞）、血小板（PLT）等常项进行多元逐步回归分析。结果多元线性逐步回归分析显示外周WBC、PLT受血镁、血铁浓度影响大;RBC受血锌,血红蛋白（Hb）和红细胞压积（Hct）受血钙与血铁,红细胞平均体积（MCV）、红细胞分布宽度（RDW）受血锌、血钙和血铁,红细胞平均血红蛋白量（MCH）、红细胞平均血红蛋白浓度（MCHC）受血锌和血铁,淋巴细胞比率（L％）、中间细胞比率（M％）和PLT受血镉浓度影响大;偏回归系数经检验有显著性意义。线性相关性分析显示,小儿血铅浓度与血镉浓度、血钙浓度的Pearson相关系数大,分别为0．28、-0．13,钙浓度与铁浓度相关系数为-0．28,P值均小于0．05。结论小儿外周血液RBC、Hb、PLT数量的波动与血液中金属元素间相互影响所形成的浓度变化密切相关。     

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