催化动力学方法测定自来水中的痕量锰

本文研究了锰离子对高碘酸钾氧化结晶紫退色反应的催化动力学条件,从而建立了痕量锰的催化光度分析方法,锰量在０￣０．５μｇ／２５ｍｌ范围内符合郎伯－比耳定律。最大吸收波长５８０ｎｍ。检测限为４．０×１０＾－１０ｇ／ｍｌ。用本法测定自来水中的痕量锰有较高的灵敏度,从而取得了满意的结果。     

催化荧光法测定痕量锰

在酸性介质中及活化剂氨三乙酸存在下，锰对高碘酸钾氧化还原型二氯荧光素的反应有催化作用，据此提出了催化荧光法测定痕量锰的新方法．方法的线性范围为０．０４～１．０ｎｇ／ｍｌ，检出限为０．０１３ｎｇ／ｍｌ．常见离子基本上不干扰测定．将方法用于人发、面粉、蔗糖、扒皮鱼、自来水中锰的测定，回收率为９５％～１０４％．     

利用乙基橙指示催化光度法测定痕量钒

在硫酸介质中,以酒石酸为活化剂,痕量钒对溴酸钾氧化乙基橙的反应有极强的催化作用．研究了最佳反应条件,并以此建立了催化动力学光度法测定痕量钒的新方法．方法的线性范围为０．２５～３．５ｎｇ／ｍＬ,检出限为０．１４ｎｇ／ｍＬ,应用于食品中痕量钒的测定,结果满意．     

罗丹明6G的极谱行为Ⅱ锑（Ⅲ）的络合吸附波

研究了锑与碘化钾和罗丹明类染料在ＨＡＣ－ＮａＡｃ缓冲溶液（ｐＨ５．６）中的极谱行为，探讨了反应机理，提出痕量锑的测定方法。线性范围在锑浓度为０．５～２０００ｎｇ／ｍｌ，检出限０．３３ｎｇ／ｍｌ。     

溴酸钾氧化藏红T动力学荧光法测定痕量溴离子

基于稀磷酸介质，痕量溴离子对溴酸钾氧化藏红Ｔ反应的抑制作用，建立了测定痕量溴离子的新动力学荧光法．方法检出限为０．５ｍｇ／ｍｌ．线性范围为０．８３－６７ｍｇ／ｍｌ，用于镁条和化学试剂中痕量溴离子的测定，结果满意．     

催化动力学光度法测定痕量钒的新体系

在酸性条件下，溴酸钾氧化铬蓝黑Ｂ的反应，钒具有极高的催化活性，以此建立了测定痕量钒的催化动力学光度法，方法的线性范围为０～２ｎｇ／ｍｌ，灵敏度为１．１１×１０－１１ｇ／ｍｌ，应用于水及人发中痕量钒的测定，结果满意．     

催化褪色动力学光度法测定痕量铅的研究

详细报道了用正交设计选择氨三乙酸作活化剂（Ⅱ）催化Ｈ２Ｏ２氧化百里酚兰褪色的动力学条件，确定了催化光度法测定痕量铅的新方法．本法测定铅（Ⅱ）的检测限量为０．２０ｎｇ／ｍｌ，铅（Ⅱ）浓度在０～５０ｎｇ／ｍｌ范围内遵守比耳定律．方法操作简单，选择性较好，已用于水样和人发中铅的测定．     

催化动力学光度法测定水中痕量铬（Ⅵ）

在弱酸性介质中，当有活化剂氨三乙酸存在时，铬（Ⅵ）对氯酸钾氧化罗丹明Ｂ褪色的反应具有强烈的催化作用。本文以此反应为指示反应，利用固定时间法研究了该催化反应的条件，建立了催化动力学光度法测定痕量铬（Ⅵ）的新方法。该方法的检出限为０．１５ｎｇＣｒ／ｍｌ，线性范围为０～２０ｎｇＣｒ／ｍｌ．将本方法用于水中痕量铬（Ⅵ）的测定，结果令人满意．     

氢化物原子吸收光谱法测定水体中痕量铅

采用火焰加热Ｔ型石英管原子化器氢化物－原子吸收光谱法测定水体中痕量铅，以草酸作抑制铜、铁等共存元素的干扰，铁氰化钾作氧化剂，在２８３．３ｎｍ测得铅的特征灵敏度＜０．１ｎｇ／ｍｌ１％吸收，测定铅浓度为０．００４ｐｐｍ的水体，相对标准偏差为５．６３％。     

动力学光度法测定痕量铁的研究

本文研究了氨水介质中，痕量铁（Ⅲ）催化过氧化氢氧化罗丹明Ｂ褪色的新指示反应及其动力学条件，建立了动力学光度法测定痕量铁（Ⅲ）的新方法。方法的灵敏度为１．８２×１０￣（－１０）ｇＦｅ（Ⅲ）／ｍｌ，测定范围为０—０．８μｇＦｅ（Ⅲ）／２５ｍｌ。用于测定人发及水中痕量铁（Ⅲ），结果满意。     

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