高锰酸钾-甲醛-()化学发光体系的研究

在甲醛存在下,高锰酸钾与()能够发生化学发光反应,产生很强的化学发光,由此建立了一种测定()的流动注射化学发光分析法.方法的检出限为4.5×10-8g/mL,相对标准偏差为1.3%(1.0×10-6g/mL(),n＝11),线性范围为1.0×10-7～1.0×10-5g/mL.该法已用于尿样中()的测定.     

流动注射化学发光法测定芬布芬

建立了一种测定芬布芬的流动注射化学发光新方法.在1.0×10-7～9.0×10-6 g/mL范围内,高锰酸钾-甲醛体系的相对化学发光强度与芬布芬浓度呈良好的线性关系,方法的检出限为1.5×10-7 g/mL.对1.0×10-6 g/mL芬布芬平行测定11次,相对标准偏差为1.0%.本方法可应用于片剂中芬布芬的测定,结果显示回收率为94%～97%.     

高锰酸钾-甲醛-氨基喋呤化学发光体系的研究

采用流动注射技术研究了酸性条件下,氨基喋呤与高锰酸钾和甲醛的化学发光行为,对影响化学发光强度的诸因素进行了实验和探讨,建立了流动注射化学发光法测定氨基喋呤的新方法.方法的检出限为6×10-9g/mL,线性范围为1.0×10-8～6.0×10-5g/mL.对2.0×10-7g/mL氨基喋呤进行11次平行测定,相对标准偏差为1.6%.     

酸性KMnO4-HCHO化学发光体系检测硫酸庆大霉素注射液中硫酸庆大霉素的含量

在酸性条件下,高锰酸钾氧化硫酸庆大霉素(Gentamicin sulphate)产生微弱化学发光,而甲醛的存在可以对该化学发光有增敏作用。该化学发光强度随硫酸庆大霉素浓度的增加而增强,并由此建立一种甲醛-酸性高锰酸钾化学发光体系快速测定硫酸庆大霉素的方法。在优化条件下,硫酸庆大霉素在5.0×10~(-5)～5.0×10~(-4 )g/mL的浓度范围内呈良好的线性关系,ΔI=3.338 24 c-7.379 34(R~2=0.995 3),方法检测限为1.5×10~(-5 )g/mL(S/N=3),并对3.0×10~(-4 )g/mL的硫酸庆大霉素10次平行测定,其相对标准偏差(RSD)为1.4%。并将建立的流动注射化学发光分析方法应用于硫酸庆大霉素注射液中硫酸庆大霉素的含量测定,方法简单,结果令人满意。     

KMnO_4-HCHO-EDTA流动注射化学发光法测定左羟丙哌嗪

在酸性介质中,左羟丙哌嗪在高锰酸钾-甲醛体系中产生化学发光,而乙二胺四乙酸的存在可显著增强其发光强度,据此建立了一种简单、快速测定左羟丙哌嗪的化学发光新方法.在实验的优化条件下,化学发光强度与左羟丙哌嗪的浓度在1.0×10-8～5.0×10-6g/mL范围内呈现出良好的线性关系.其检测限(3σ)为3.75×10-9g/mL,对8.0×10-7g/mL的左羟丙哌嗪溶液进行11次平行测定,相对标准偏差为3.03%.将本法应用于合成样品中左羟丙哌嗪的测定,结果满意.     

锰(Ⅳ)-甲醛流动注射化学发光体系测定酪氨酸

根据锰(Ⅳ)氧化酪氨酸可以产生弱的化学发光,甲醛对这一化学发光反应有较强的增敏作用的原理,建立了测定酪氨酸的流动注射化学发光分析法.实验结果表明,该方法检出限为2.0×10-7g/mL酪氨酸,线性响应范围为8.0×10-7～1.0×10-5g/mL.对5.0×10-6g/mL酪氨酸进行11次测定,相对标准偏差为2.1%.该法已应用于测定医用18 氨基酸注射液中的L 酪氨酸.     

静态注射化学发光法测定空气中的微量甲醛

基于碱性介质中没食子酸-过氧化氢-甲醛体系的化学发光现象,建立了静态注射化学发光法测定微量甲醛的方法。最佳测定条件为:没食子酸浓度0.05 mol/L,过氧化氢体积分数1.35%,氢氧化钠浓度0.16 mol/L。方法检出限为7×10-9g/mL,线性范围为3.0×10-7~8.0×10-5g/mL。该法可用于测定空气中微量甲醛。     

高锰酸钾-甲酸体系流动注射化学发光法测定Vc的含量

酸性条件下,高锰酸钾氧化维生素C产生较弱的化学发光信号,甲酸存在时能强烈增强化学发光.该文结合流动注射技术,建立了测定Vc的化学发光分析法,研究了不同因素对体系产生化学发光信号的影响.体系的测定线性范围为:9.0×10-9~7.0×10-6g/mL,方法的检出限(3σ)为3×10-9g/mL.对浓度为1.0×10-7g/mL的Vc溶液进行了11次平行测定,相对标准偏差为4.7%.该法与其它方法相比,具有更低的检出限和更宽的线性范围,已成功地运用于维生素C注射液和片剂中含量的测定,结果满意.     

流动注射化学发光法测定头孢噻肟钠

在硫酸介质中,头孢噻肟钠对高锰酸钾-乙二醛体系的化学发光有增敏作用,据此建立了流动注射化学发光法测定头孢噻肟钠的新方法.实验考察并讨论了不同类型的表面活性剂和3种醛对体系化学发光强度的影响.结果表明,该方法的相对发光强度与头孢噻肟钠的质量浓度在2.0×10-7～6.0×10-5 g/mL范围内呈良好的线性关系,方法的检出限为3.0×10-8 g/mL;对4.0×10-6 g/mL头孢噻肟钠连续进行11次平行测定,相对标准偏差为0.47%.利用本法测定针剂中头孢噻肟钠的含量,结果较为满意.     

高锰酸钾-硫酸体系流动注射化学发光法测定乙二醛的含量

酸性条件下,高锰酸钾氧化乙二醛产生强烈的化学发光信号,结合流动注射技术,建立了测定乙二醛的化学发光分析法。研究了不同因素对体系产生化学发光信号的影响;探讨了可能的化学发光机理。体系测定的线性范围为2.0×10-5~7.0×10-2g/mL,方法的检出限(3σ)为7×10-6g/mL。对浓度为1.0×10-3g/mL的乙二醛溶液进行了11次平行测定,相对标准偏差为3.8%。将本法应用于模拟样品中乙二醛的分析,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.     

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