催化光度法测定电镀废水中微量锌(Ⅱ)

在PH为4．75的HAc-NaAc缓冲溶液和OP存在下，痕量锌(Ⅱ)对H2O2氧化铬黑T(EBT)的褪色反应有强的催化作用。借此建立了测定痕量锌(Ⅱ)的催化光度法。结果表明，有色溶液的最大吸收波长为530nm，催化程度与锌(Ⅱ)浓度在0-0．20mg/L范围内符合比耳定律，方法检出限为0．70μg/L，加标回收率为99．2％-105．3％之间。该法已用于处理电镀废水中的微量锌(Ⅱ)测定，结果满意。     

催化动力学光度法测定面粉中痕量铜

研究了在盐酸介质中，铜(Ⅱ)催化碘酸钾氧化偶氮胂Ⅰ褪色反应的适宜条件与影响因素，建立了动力学光度法测定痕量铜的新方法．方法的线性范围为0-120μg/L，检出限为0．1686μg/L．该催化反应用于面粉中铜(Ⅱ)的测定，结果满意．     

流动注射催化光度法同时测定铁和锰

基于铁(Ⅲ)和锰(Ⅱ)对高碘酸钾氧化罗丹明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，应用岭回归法对铁(Ⅲ)和锰(Ⅱ)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锰的方法。在铁(Ⅲ)和锰(Ⅱ)浓度比为1：4——2：1的范围内，应用该法对其混合物进行测定，田收率分别为101．2％和101．1％。     

负催化动力学光度法测定痕量镍的研究

本文研究了稀氨水溶液中,镍(Ⅱ)负催化过氧化氢氧化茜素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镍(Ⅱ)的新方法,证明了本反应为一级反应,速度常数 k=-0.100 min~(-1),半衰期 t_(1/2)=6.93 min,表观活化能既 E_a=252.7 kJ/mol,其 Sandell 灵敏度为2.27×10~(-5)μg/cm~2,线性范围0～0.10μg/25 ml.该法用于测定饮用水和人发中的痕量镍(Ⅱ)获得满意的结果.     

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．     

H2O2—邻苯二酚紫催化动力学光度法测定痕量铜（Ⅱ）

Ｃｕ（Ⅱ）在ｐＨ＝７．０的溶液中能催化过氧化氢氧化邻苯二酚紫的褪色反应。通过研究催化褪色反应速度的最佳条件，建立了测定铜（Ⅱ）的新催化动力学光度法。方法的检测限为１８μｇ／Ｌ，线性范围为２０～８０μｇ－Ｌ。     

萘酚绿B催化动力学光度法测定痕量钒

以磷酸介质中，硫酸铵存在下，微量钒(V)对溴酸钾氧化萘酚绿B褪色反应具有的催化作用，建立了测定微量钒的新催化动力学光度法．测定线性范围为0．2～2．2μg／L，方法用于人发和水样中微量钒的测定，结果满意。     

煌焦油兰──过氧化氢体系催化光度法测痕量铜(Ⅱ)的研究

本文研究了在氨性介质中，痕量铜（Ⅱ）催化过氧化氢氧化煌焦油兰褪色反应及其动力条件，建立了一种催化光度法测痕量铜（Ⅱ）的新方法，线性范围为002－10μg／25ml，检出限为39×10－10g／ml．用于环境水标样，铝合金标样中痕量铜（Ⅱ）的测定，结果满意．     

催化动力学测定微量锰（Ⅱ）的研究

研究了锰(Ⅱ)催化抗坏血酸还原钼酸铵而形成铟蓝的指示反应及其动力学条件,建立了测定微量锰(Ⅱ)的新方法.方法灵敏度为2.7×10~(-10)g/ml锰(Ⅱ),检测范围0—11μg/25ml.用于测定中药内的微量锰(Ⅱ),获得了满意的结果.     

催化光度法测定痕量钴（Ⅱ）的研究

ｐＨ＝２．０的Ｈ２ＳＯ４介质中，钴（Ⅱ）对ＫＩＯ４和Ｈ２Ｏ２氧化中性红（ＮＲ）的褪色反应有明显的催化作用，据此建立了测定痕量钴（Ⅱ）的催化动力学光度法，可测定２×１０－８～４×１０－７ｇ／ｍｌ的钴（Ⅱ），检出限为５×１０－９ｇ／ｍｌ。用于维生素Ｂ１２中钴的测定，获得满意的分析结果。     

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