多巴胺在纳米金修饰微玻碳电极上的电化学行为研究

用电沉积的方式制备了纳米金修饰微玻碳电极 ,该修饰电极能分开多巴胺和抗坏血酸的氧化峰 .研究了溶液pH值、磷酸缓冲溶液浓度对多巴胺电化学行为的影响 .多巴胺氧化峰电流值与其浓度在 5× 10 - 6～ 1× 10 - 4mol/L范围内成线性关系 .     

聚吡啰红Y修饰电极上多巴胺的电化学行为及其伏安法检测

在玻碳电极上用电化学方法制备了聚吡 口罗 红Y修饰膜电极 ,并研究了此电极上多巴胺的电化学行为及其检测 聚吡 口罗 红Y修饰电极对多巴胺有良好的电催化能力 ,循环伏安图上出现一对灵敏、可逆的氧化还原峰 在最佳条件下 ,氧化峰电流与多巴胺浓度在 5 6× 10 -7～ 3 2× 10 -3 mol/L范围内呈良好线性关系 ,开路富集 2min ,检测限为 1 2× 10 -8mol/L 用于多巴胺针剂含量的测定 ,结果满意     

聚对乙酰基偶氮胂膜修饰玻碳电极对抗坏血酸的催化氧化研究

用电化学聚合法研制了聚对乙酰基偶氮胂膜修饰玻碳电极 ,该电极对抗坏血酸 (AA)有良好的电催化氧化作用 ,AA在修饰电极上的氧化电位较空白玻碳电极负移约 4 50 m V。在选定的实验条件下 ,修饰电极以线扫伏安法测定 AA的线性范围为 5.0× 1 0 -5～ 1 .0× 1 0 -2 mol/L,检测下限为 1 .0× 1 0 -5mol/L。该电极具有较好的稳定性和重现性。     

聚组氨酸修饰电极测定多巴胺的研究

本文研究了多巴胺在聚组氨酸修饰电极上的循环伏安行为.在pH7.0的磷酸盐缓冲溶液中,用线形扫描伏安法测定多巴胺的线性范围为:6.0×10-8～1.0×10-5mol/L,1.5×10-5～1.0×10-3mol/L,检出限为4×10-8mol/L.用于药剂中多巴胺的测定,结果满意.     

聚氨基丙酸化学修饰电极的制备及其对抗坏血酸的电催化氧化研究

采用电化学聚合法研制了聚氨基丙酸修饰玻碳电极,该电极对抗坏血酸（AA）有良好的电催化氧化作用,AA在修饰电极上的氧化电位较空白裸电极负移450mV。在实验条件下,以线扫伏安法研究了修饰电极测定AA的线性范围为2×10-3～1×10-2mol／L。该电极具有较好的稳定性和重现性。     

电流型聚吡咯碘离子化学修饰电极的制备与性能研究

本文在玻碳电极（GCE）表面上修饰了一层导电聚合物──聚吡咯（PPy）薄膜,用循环伏安法制备了新型的基于电流响应的碘离子掺杂的聚吡略修饰电极;研究了电极的电化学特性。此修饰电极对碘离子的响应是基于碘离子在PPy膜与电解质溶液中的掺杂平衡以及PPy膜中的碘离子在修饰电极表面的氧化还原过程;制成的电流型电极对5．0×10-2～1．0×10－5mol／L的碘离子呈良好的线性响应关系,检测下限为6．0×10－6mol／L,具有线性范围广,性能稳定的特点。     

聚对氨基苯甲酸修饰电极测定药剂中的多巴胺

本文研究了聚对氨基苯甲酸修饰玻碳电极的制备及多巴胺在此修饰电极上的电化学行为。在pH为7．5的磷酸盐缓冲溶液中,多巴胺在此修饰电极上呈现三个峰,两个还原峰和一个氧化峰,其峰电位随着pH的增加而负移。多巴胺浓度在3．0×10~(-6)～8．0×10~(-4)mol/L的范围内与其氧化峰电流呈线性关系,回归方程为i_p(10μA)=0．92023 0．36264c(mol/L),相关系数r=0．9925,检出限为2．0×10~(-8)mol/L。实验结果表明：该修饰电极能有效消除抗坏血酸的干扰,方法用于注射液中多巴胺的检测,其回收率在98．9%～100．5%范围内。     

聚L-苯丙氨酸修饰电极测定对乙酰氨基酚

采用循环伏安法制备了聚L-苯丙氨酸薄膜修饰玻碳电极,研究了对乙酰氨基酚在该修饰电极上的电化学行为,建立了循环伏安法测定对乙酰氨基酚的新方法.研究发现:在pH 7.0的磷酸盐缓冲溶液中,聚L-苯丙氨修饰电极对对乙酰氨基酚存在灵敏的氧化作用,氧化峰电位负移50 mV.对乙酰氨基酚的浓度在2.0×10-5~2.0×10-4mol.L-1和8.0×10-7~2.0×10-5mol.L-1范围内与其峰电流呈良好的线性关系,检出限为5.0×10-7mol.L-1.对1.0×10-5mol.L-1对乙酰氨基酚平行测定5次,相对标准偏差为1.6%.该法可用于药品中对乙酰氨基酚的测定,结果满意.     

高比表面积活性炭修饰电极对对苯二酚的电催化作用

采用循环伏安法和交流阻抗试验方法研究了对苯二酚在高比表面积活性炭修饰电极上的电化学行为。研究表明：该修饰电极的电化学过程受扩散过程控制,且该修饰电极对 对苯二酚的电化学反应具有较高的催化活性。与裸电极相比,高比表面积活性炭修饰电极在含有0.1 mmol/L对苯二酚的HCl溶液中氧化峰电流和还原峰电流分别为裸电极的15.6和 29.8倍。在0.1 mol/L HCl溶液中,氧化峰电流IPa与对苯二酚浓度C(0.01~7 mmol/L)呈良好的线性关系：Ipa=9×10-6+5×10-8×C,R2=0.996 7。     

聚四氨基铜钛菁修饰Pt微电极测定溶解氧的研究(英)

该文通过电化学聚合的方法制得了一种化学修饰铂盘 (直径为 2 0 0微米 )电极。采用循环伏安 ,差示脉冲伏安和差示脉冲安培研究了此修饰电极对氧的响应。实验表明 ,四氨基铜酞菁对氧有较好的催化作用。用此修饰电极采用差示脉冲安培法测定溶解氧灵敏度为 4 .8× 10 - 4A/mol/L ,检测限根据三倍信噪比计算得 1.8× 10 - 6 mol/L ,且响应时间少于 15秒。研究还发现 ,此修饰电极具有很好的稳定性和重现性。采用此修饰电极测定锅炉水中的溶解氧得到了满意的结果。     

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.     

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     

Call for Papers

<正>"The Journal of Shanghai Normal University:Mathematics"is published by Shanghai Normal University as regular issues of The Journal of Shanghai Normal University each year from 2014 in English.The editors-in-chief of the issues are professors Yuhao Cong and Maoan Han.The Journal of Shanghai Normal University was started in 1958 with     

Journal of Donghua University ( English Edition) Contents of Volume 31

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