催化光度法测定微量铜（Ⅱ）的研究

本文研究了硫酸介质中,Cu~(2+)催化H_2O_2-KIO_3-中性红的褪色反应及最佳动力学条件,建立了催化褪色光度法测定微量铜(Ⅱ)的新方法.本方法灵敏度为3.6×10~(-11)g Cu~(2+)/ml     

重铬酸钾分光光度法测定药片中维生素C

在0.16 mol/L 硫酸介质中,维生素C与重铬酸钾发生褪色反应.采用分光光度法在350 nm处测定重铬酸钾的吸光度变化值ΔA.ΔA与维生素C的浓度在1.7～100 μg/mL范围内成线性关系,回归方程为ΔA =0.007 7CX 0.027,相关系数R=0.998 5.用于药片中维生素C含量的测定,回收率在91%～99%之间.该方法操作简便,准确性好,灵敏度高.     

以3,5—di Br—PADAP流动注射分光光度法测定铜

本文以3.5-diBr-PADAP 流动注射分光光度法测定铜.研究了最佳显色条件,乳化剂 OP 的作用.基于反应速率差选择性地测定铜,允许高达200倍的钴镍存在.测定低限50μg/mL,进样频率每小时125个样.已用于测定矿石及废水中的铜.     

二溴硝基偶氮氯膦用于微量铂系元素测定的应用研究

作为不对称变色酸双偶氮试剂的二溴硝基偶氮氯膦与金属钯可发生显色反应,而与同属铂系元素的其他五种金属的显色反应并不明显;可是在高碘酸钾、溴酸钾等氧化剂的存在下,它们却能使二溴硝基偶氮氯膦发生催化褪色反应.从而建立了用直接光度法测定钯和用催化光度法测定钌、铑、锇、铱、铂的微量分析新方法.本文考察了该系列水相中直接测定铂系元素反应的最佳条件,并提出了贵金属样品中微量铂系元素的测定方法.     

亚甲基蓝测定微量肝素钠的研究

研究肝素钠与碱性亚甲基蓝之间的相互作用，对反应机理进行初步的探讨.结果表明，在pH 4.6的HAc-NaAc缓冲溶液中，肝素钠与亚甲基蓝碱性染料形成离子缔合物时，染料发生明显褪色，并且在最大吸收波长664 nm处的吸光度显著下降，下降程度与肝素钠的含量呈线性关系，建立了测定痕量肝素钠含量的新方法.线性范围0~1.6 mg/L，相关系数为0.9964，相对标准偏差为0.8%.该法简便、快速，对样品中肝素钠的测定令人满意.     

主成分回归光度法同时测定钴镍铜铬

由于钴、镍、铜、铬有色离子的吸收光谱严重重叠,较难用光度法选择性测定试样中单一元素。为了探讨不经分离直接测定样品中的单一元素,应用主成分回归法处理校正样吸光数据,并根据校正样中的单一已知元素浓度向量求算浓度转换向量,转换向量求出后就可对任意待测样吸光度向量进行转换从而求出待求组分的浓度。对不同比例的钴、镍、铜、铬合成样分析均取得了满意结果。     

TAMB分光光度法测定微量铜的研究

本文研究了ＴＡＭＢ分光光度法测定向量铜的条件；条件宽容，方法简便，用本法测定自来水及模拟橡胶填充剂“白炭黑”提取液中的向量铜，结果令人满意。     

分光光度法测定藏药红景天微量铜的研究

用ａ,β,γ,σ,四－（４－三甲铵苯基）卟啉「Ｔ（４－ＴＭＡＰ）Ｐ」在酸性溶液中与铜显色,在４２０ｎｍ下用分光光度法测定藏药红景天中的铜。测定结果与火焰原子吸收法基本一致,标准回收率９６．４－１０４．４％,１１次测定的相对标准偏差为２．１２－４．５３％。方法准确、快速、简便。     

二溴羧基偶氮氯膦用于微量铂系元素测定的研究及应用

二溴羧基偶氮氯膦与金属钯可发生显色反应,而与其他铂系元素在高碘酸钾、溴酸钾等氧化剂的存在下发生催化褪色反应,从而建立了用光度法测定钯和用催化光度法测定钌、铑、锇、铱、铂的微量分析新方法。本文考察了该系列反应的最佳条件及方法应用。此类方法可直接在水相中进行,简便快速,灵敏度高,已用于贵金属精矿、贵金属催化剂等样品中微量铂系元素的测定。     

分光光度法在钢铁元素分析中的应用

分光光度法测量钢铁元素具有速度快,准确。全文首先介绍了分光光度法与钢铁基本五元素,随后简要分析了分光光度计的组成及其分类。最后提出了分光光度测量钢铁中元素的方法：设计分光光度设计法;试剂前期准备;使用分光光度计进行测试。     

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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