催化光度法测定痕量钒的研究和应用

本文基于在抗坏血酸存在下,钒对KBrO_3氧化甲基绿褪色的新指示反应,建立了一个测定痕量钒的催化光度新方法。方法检出限2.81×10~(10)g/ml。测定范围为0-16ng/25ml钒。用于人发、水样品中钒的测定,结果满意。     

催化动力学光度法测量微量铑的研究

本文报道了酸性条件下微量钌对KIO_4氧化对硝基偶氮氯膦(CPA—PN)褪色具有显著的催化作用,并以此反应为指示反应建立了测定微量钌的催化光度法。此反应的最佳反应条件为:10.0ml溶液中含1mol/LH_2SO_41.0ml,0.1％对硝基偶氮氯膦0.40ml,1.0×10~(-2)mol/LKIO_41.00ml,沸水浴中加热5min,该方法的检测,限为0.01μg/10ml,钌的含量在0.01～0.30μg/10ml范围内符合比耳定律,此法应用于贵金属精矿中微量钌的测定,结果令人满意。     

流动注射化学发光法测定水杨酸

研究了酸性条件下,吐温20增强铈(IV)与水杨酸的化学发光反应,由此建立了一种测定水杨酸的流动注射化学发光分析法.该法选择性好、灵敏度高、线性范围宽.方法的检出限为2.5×10-9g/ml,相对标准偏差为0.85%(4.0×10-7g/ml 水杨酸,n=11),线性范围为4.0×10-9-1.1×10-6g/ml.不需分离和其它预处理可直接用于杀菌药液中水杨酸含量的测定.     

在线电生Mn（Ⅲ）流动注射化学发光法测定盐酸氯丙嗪

将恒电流电解产生Mn(Ⅲ)与流动注射化学发光法结合,基于盐酸氯丙嗪可被Mn(Ⅲ)氧化直接产生化学发光且发光强度与其浓度在一定范围内呈线性关系,从而建立了测定盐酸氯丙嗪的流动注射化学发光新方法.该法在盐酸氯丙嗪的浓度为2×10-7g/ml～1×10-4g/ml范围内呈线性关系,检测限为8×10-8g/ml.相对标准偏差为1.8%(n=11,1×10-6g/ml).该法具有简便、快速、重现性好等特点.成功地应用于片剂中盐酸氯丙嗪的测定.     

流动注射化学发光测定卡托普利

罗丹明6G可显著增强Ce(IV)-卡托普利化学发光强度.在此基础上结合流动注射技术建立了一种新的卡托普利的测定方法.该方法选择性好、灵敏度高、操作简单.卡托普利在2.0×10-7～1.0×10-5g/ml范围内与发光信号呈线性关系,检出限为6.7×10-8g/ml,对1.0×10-6g/ml 的卡托普利进行测定(n=7),相对标准偏差为1.0%,方法用于药物中卡托普利含量的测定,结果与标准方法测得值一致.     

催化光度法测定痕量锰

本文基于在近中性介质中,痕量锰(Ⅱ)对高碘酸钾氧化氨基黑10B的褪色反应的催化作用建立了一个检出限为0.02ng/ml、线性范围为0.40-10.0ng/ml的测定锰的新方法,用于人发、人尿中痕量锰的测定,获得了满意结果。     

藏红O-高碘酸钾体系催化光度法测痕量锰的研究

本文研究了在pH5.2的NaAc-HAc介质中,痕量锰对高碘酸钾氧化藏红O反应的催化作用,建立了一个测定痕量锰的新方法,线性范围为0-0.4μg/25ml,检出限为1.51×10~(-10)g/ml,并用于铝合金标样,环境水标样中痕量锰的测定.     

催化光度法测定痕量铜—Cu(Ⅱ)—亮绿SF—H_2O_2体系

本文基于在氨性介质中痕量Cu(Ⅱ)对H_2O_2氧化亮绿SF反应的催化作用,提出了催化光度法测定痕量铜的新方法,其检出限为1.9×10~(-10)g/ml,线性范围为3.16×10~(-10)～1.15×10~(-8)g/ml。同时,测定了催化反应与非催化反应的表观活化能,研究了共存离子对测定的影响。方法用于铝合金和环境水样分析,获得了满意的结果。     

气相色谱法检测摇头丸中的盐酸氯胺酮

以三氯甲烷提取、气相色谱法测定摇头丸中的盐酸氯胺酮含量 ,线性范围 1.0× 10 -3 — 4.0× 10 -1mg/ml,回归方程为 y =1.40 2× 10 7x +8.193× 10 4 (r =0 .998) ,检测限为 2 .0× 10 -4 mg/ml,回收率 90 .3 %。     

试样加入法-离子选择性电极测定氟

建立了一种离子选择性电极法测定高浓度氟的新方法.该方法在体积为100.0 ml、浓度为1.000×10-4 mol/l的标准溶液中加入1.000 ml高浓度试样,加入前后测定其电动势,由这两个电动势和溶液体积计算试样的含氟量.10次测定的标准偏差S小于0.004,相对标准偏差RSD小于4%,3个水平、6次测定的回收率在95.0%～101%之间.     

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