金(Ⅲ)-卤化物-吖啶红体系的光谱特性及应用

在pH3．6的Walpole缓冲溶液中,吖啶红（ADR）在526nm处有一吸收峰,在570nm处有一荧光峰,AuCl4^-与过量的I^-反应生成AuI2^-和I3^-,二者与ADR缔合形成[（ADR）2-AuI2-I3]n缔合微粒．它在320,400和600nm处产生3个共振散射峰,在570nm处存在荧光猝灭,在526nm处存在减色效应．Au（Ⅲ）浓度在0．047～2．84mg／L范围内与共振散射强度△I600nm呈线性关系,检测限为0．011mg／L．方法用于合成样和含金废水中金的测定,结果满意．     

吖啶橙缔合微粒共振散射光谱法测定痕量NO-2

在8.0×10-3mol/LHCl-2.0×10-3mol/LKI介质中,吖啶橙(AO)在515nm处有1个同步荧光峰.当有NO-2存在时,NO-2与过量的I-反应生成I-3,I-3与AO形成缔合微粒,在320,560nm处产生2个共振散射(RS)峰,在470nm处产生1个同步散射峰.NO-2浓度在0.068～7.36mg/L范围内与320nm波长处的共振散射光强度成线性关系.据此建立了一个测定水中NO-2的共振散射光谱分析法.光谱研究结果表明,(AO-I3)n缔合微粒和界面的形成是导致体系RS增强的根本原因.     

吖啶橙缔合微粒共振散射光谱法测定痕量NO-2

在8.0×10-3 mol/L HCl-2.0×10-3 mol/L KI介质中,吖啶橙(AO)在515 nm处有1个同步荧光峰.当有NO-2存在时,NO-2与过量的I-反应生成I-3,I-3与AO形成缔合微粒,在320,560 nm处产生2个共振散射(RS)峰,在470 nm处产生1个同步散射峰.NO-2浓度在0.068～7.36 mg/L范围内与320 nm波长处的共振散射光强度成线性关系.据此建立了一个测定水中NO-2的共振散射光谱分析法.光谱研究结果表明,(AO-I3)n缔合微粒和界面的形成是导致体系RS增强的根本原因.     

催化共振散射光谱法测定木瓜蛋白酶活力

木瓜蛋白酶催化水解酪蛋白生成小分子氨基酸和肽,剩余底物酪蛋白与三氯乙酸结合形成粒径约为1740nm的缔合物微粒。该微粒在360、400、420、470、520nm处产生5个共振散射峰,其中最强峰位于470nm。在选定条件下,随着木瓜蛋白酶量的增加,体系中剩余酪蛋白浓度降低,470nm处的共振散射光强度,Ⅰ470nm降低。木瓜蛋白酶的酶活力在0．024～4．8 USP／mL范围内与470nm处的共振散射光强度降低值△Ⅰ470nm呈现良好线性关系,检出限为0．0083 USP／mL。该共振散射光谱法用于嫩肉粉中木瓜蛋白酶活力测定,结果满意。     

蛋白质-偶氮胂Ⅰ复合物的光度性质研究

研究了蛋白质与偶氮胂Ⅰ的显色反应.在pH3.2的Britton-Robinson缓冲溶液中,偶氮胂Ⅰ与蛋白质形成红色复合物,λmax为551 nm,ε为2.5×105 L@mo1-1@cm-1,蛋白质含量在13.2～231 mg/L范围内服从Beer定律.所提出的方法可直接用于血清、花生等生物样品中蛋白质的测定.     

[I2Br]-EV体系的共振瑞利散射光谱研究

在过量溴化钾存在的稀磷酸介质中,乙基紫的共振瑞利散射十分微弱,但是当乙基紫与配阴离子[I2Br]^-反应,形成离子缔合物时,共振瑞利散射显著增强并出现一个新的共振瑞利散射光谱。其共振瑞利散射峰位于535nm和355nm,研究了该反应的适宜条件和影响因素。碘的浓度范围在0－0．64μg/mL时,共振瑞利散射强度与碘的浓度成正比。该方法具有较高的灵敏度,碘离子的检出限为1．58ng/mL。该法具有较好的选择性,可用于痕量碘离子的测定。     

IO3--I3--吖啶红体系的共振散射光谱研究及应用

在过量的I-存在的稀盐酸介质中,当有IO3-存在时,IO3-与过量的I-反应生成I3-,I3-与吖啶红、吖啶橙染料均可形成离子缔合微粒。吖啶红、吖啶橙分别在540、480 nm有较强吸收峰,在550、520 nm有较强荧光峰,吖啶红体系在605 nm处产生1个较强的共振散射(RS)峰,IO3-浓度在1.0×10-7~4.0×10-6mol/L与605nm波长处的共振散射光强度成线性关系。吖啶橙体系在560 nm处产生1个较强的共振散射(RS)峰,碘酸根浓度在2.0×10-7~1.2×10-5mol/L与560 nm波长处的共振散射光强度成线性关系。据此建立测定食盐中碘酸根的一种共振散射光谱法。采用此体系测定食盐中碘酸根,结果满意。     

在Tween 80和溴化十六烷基三甲铵存在下钛与溴邻苯三酚红高灵敏显色反应研究

在氯乙酸介质中,在 Tween 80和溴化十六烷基三甲基铵(CTAB)参与下,Ti(IV)与溴邻苯三酚红(BPR)形成两种络合物,BPR过量时为红紫色络合物(λ_(max)=527nm);Ti(Ⅳ)过量时为兰色络合物(λ_(max)=650nm)。本文系统研究红紫色络合物的形成条件。试验表明,此类络合物具有极高的灵敏度(ε_(527nm)=2.5×10~6I·mol~(-1)·cm~(-1))但选挥性较差。反应的适宜酸度为pH2.40—2.91。络合物中Ti(Ⅳ)与BPR的摩尔比为2:5。钛含量在2—12ng/ml范围遵守比尔定律。研究了30多种离子的干扰。讨论了反应灵敏度提高的原因。     

银-邻二氮菲-二溴荧光素光度法测定银的含量

研究了银 -邻二氮菲 -二溴荧光素离子缔合物体系在水溶液中的显色反应 .在pH7.1NH4 Ac缓冲介质中 ,PVA - 12 4存在下 ,形成 1∶2∶1型红色的离子型缔合物 ,λmax=5 40nm ,ε =4.2 9× 10 4 L·mol-1·cm-1,银含量在 0～ 5 0 μg/ 2 5mL范围内符合比尔定律 ,在EDTA存在下本文提出的测定银的新方法选择性好、灵敏度高 ,用于相纸、废定影液和废水中银的测定 ,有很好效果。     

光谱法研究杯[8]芳烃与蛋白质的相互作用

用荧光光度法研究了杯[8]芳烃磺酸钠与蛋白质的相互作用.实验结果表明,牛血清蛋白可产生λex,max=280 nm,λem,max=349 nm的自身荧光.杯[8]芳烃磺酸钠在一定条件下能静态猝灭蛋白质的荧光.求出了杯[8]芳烃磺酸钠与蛋白质相互作用的形成常数,络合比和结合位点数,确定了反应的最佳条件为pH 7.5,0.1 mol.L-1NaCl用量1 mL,初步探讨了体系的主要作用力为范德华力.     

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