水中竞争性阴离子对Fe0除砷效率的影响研究

本文研究水中几种无机阴离子H2PO3^-、SiO3^3-、NO3^-、SO4^2-、HCO3^-对零价铁（Fe^0）除砷效率的影响，实验结果显示：H2PO3^-、SiO3^3-的存在会由于竞争性吸附显著降低Fe^0的除砷效率，而高浓度的NO3^-与SO4^2-可以促进Fe^0对砷的去除，HCO3^-对Fe^0的除砷效率影响不大．     

等离子色谱法测定矿泉水中F^—,Cl^—,NO3^—,SO4^2—

本文应用离子色谱法测定了矿泉水、纯净水中F^-,Cl^-,NO3^-,SO4^2-等阴离子,结果表明,利用该法测定以上阴离子,速度快,方法简便,能一次同时测定多种离子,获得准确可靠的定性和定量结果。     

IC分析流动相浓度选择的数学模型研究(Ⅰ)

论述离子色谱分析条件优选的数学模型及其在分析近地下水模拟样品中的应用问题。求解由指数函数和对数函数构成的特征方程可知，由等浓度的Na2CO和NaHCO3组成的淋洗液，最佳量浓度为0．00385mol.L^-1。当使用8053A分离柱，最佳量浓度流动相流速为2mL.min^-1时，样品中七种阴离子（F^-、CL^－、NO2^-、PO4^3-、SO3^2-及SO4^2-）的背景抑制电导波峰分辩率均可达到1．50以上。     

重庆缙云山降水化学组成的季节变化特征分析

对重庆缙云山自然保护区1998-1999年126个降水雨样的主要化学组成成分特征和季节变化特点进行了分析研究，结果表明，缙云山降水pH平均值为5.23，电导率为33.90μs／cm，降水的酸化与污染程度低于重庆市市区，降水pH值和各主要离子表现出明显的季节变化特征，总体表现为冬、春季污染程度高于夏秋季，这可能与降水量的季节分布等有关，降水中NH4^-和Ca^2＋的大量存在极大地中和了酸根离子（SO4^-、NO3^-、Cl^-）对雨水的酸化作用，提高了降水pH，降低了酸雨发生频率，降水pH与各主要离子在冬季表现出显著的负相关关系，碱性阳离子（K^＋、Na^＋、Ca^2＋、Mg^2＋、NH4^-）与SO4^2-的相关性在冬季极为显著，在夏季则较弱，电导率与SO4^2-的相关性表现出同样的季节变化特点。     

解脂假丝酵母吸附铬的盐效应

研究了不同浓度的NaCl、MgCl2、AlCl3、NaNO3、Na2SO4和NaBr等电解质对解脂假丝酵母吸附铬的盐效应．吸附动力学表明,阴离子相同时,低浓度的Na^＋、Mg^2＋对吸附有促进作用,而Al^3＋在实验设定的浓度范围内对吸附均有抑制作用,盐效应顺序为Al^3＋〉Mg^2＋〉Na^＋．阳离子相同时,低浓度的α—对吸附有促进作用,而Br^-、NO3^-、SO4^2-对吸附均有抑制作用,盐效应顺序为Br^-〉NO3^-〉SO4^2-〉Cl^-．生物吸附过程的盐效应可能与阳离子的半径以及与配位体所形成的配合物的稳定性有关,也可能与菌体表面带正电荷的官能团与阴离子之间的静电作用有关。     

郑州市PM2.5和PM10中水溶性无机离子的污染特征

于2009年10月至2010年8月间采集郑州市大气颗粒物PM2.5与PM10样品,对其质量浓度及水溶性离子进行分析研究.结果表明：PM2.5在秋、冬、春、夏四季的质量浓度的平均值分别为134.9、121.6、77.9和102.0μg/m^3,PM10在秋、冬、春、夏四季的质量浓度的平均值分别为193.2、184.0、140.9和140.5μg/m^3,日均值超标率分别达77.8%和59%.PM2.5和PM10质量浓度呈现很好的相关性,春季粗粒子在PM10中的比例相对较高,而秋、冬和夏季细粒子是PM10的主要组成部分.主要的水溶性离子是SO4^2-、NO3^-和NH4^＋,大部分以（NH4）2SO4和NH4NO3形式存在;NO3^-和SO4^2-质量比小于1,说明采样期间郑州市大气以固定排放源污染为主.     

广州市酸雨状况及其化学组成对比分析

1993年～2006年广州市降水监测结果表明,广州市降水pH年均值范围为4．31～4.78,酸雨频率70.2％～82．0％。降水中化学组分以SO4^2-、NO3^-为主要阴离子,Ca^2＋、NH4^＋为主要阳离子,酸雨类型转变为硫酸型和硝酸型并重。广州市酸雨污染状况依然严重。     

离子色谱法同时测定饮用水中7种阴离子研究

研究化学抑制电导-离子色谱法同时测定饮用水中7种阴离子的分析方法．将水样经0．45μm微孔滤膜过滤,经过RP柱处理后连续进样,利用离子色谱仪ICS-3000同时测定F^-、Cl^-、NO2^-、Br^-、NO3^-、SO4^2-、PO4^3- 7种阴离子的浓度．试验采用IonPac AS11A分离拄和IonPac AG11A保护柱,淋洗液由淋洗液自动发生器产生,流速为1．2mL／min．保留时间的RSD为0．06％～0．59％,峰面积的RSD为1．06％～2．36％,各离子加标回收率为87．6％～105．7％,标准曲线的相关系数为0．9959～0．9998．该方法具有灵敏、准确、简便等优点,可用于饮用水中7中阴离子的同时分析．     

离子色谱法测定矿泉水中F^-、Cl^-等阴离子

建立了矿泉水中F^-、Cl^-,NO3^-、SO4^2-四种阴离子的离子色谱测定方法．方法采用ICS-1000型离子色谱仪．Lonpac AS14A色谱柱,ASRS ULTRA Ⅱ抑制器,8．0mmol·L^-1碳酸钠-1．0mmol·L^-1碳酸氢钠混合液为淋洗液,流速为1．0mL·min^-1．方法的线性范围广、线性相关性好（r=0．9992—0．9999）,相对标准差（RSD）为0．28％～0．91％,平均加标回收率为98．97％-103．4％,最低检测限为0．0111-0．0522mg·L^-1．该法测定矿泉水中F^-、Cl^-、NO3^-、SO4^2-等阴离子,不需外加试剂对抑制器进行再生．具有操作简便、灵敏度高、准确、快速等优点．     

IO3-与IO4-共存体系的氧化还原滴定分析法

IO3^-和IO4^-共存体系中IO3^-、IO4^-的定量分析所用分步滴定法操作繁琐，故提出共存体系的氧化还原滴定法。在碘量法分别测定IO3^-、IO4^-的基础上，利用MoO4^2-作为IO4^-的掩蔽剂，在IO3^-与IO4^-共存体系中采用氧化还原滴定法测定IO3^-和IO4^-。此分析方法的δ＊IO3^-)＝0．716％，δ（IO4^-)=0.127%，分析结果表明，该方法实用、简便、可靠。     

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     

An affordable accurate evaluation of the binding conformations predicted by molecular docking studies in bio-system

Franck-Condon factors bridge the gap between theoretical modeling and experimental observations for molecular electronic spectroscopy and electron transfer.Under the displaced harmonic oscillator approximation,multidimensional Franck-Condon factors are decomposed into a product of many one-dimensional(1D)Franck-Condon(FC)factors,and each 1D-FC factor is associated with one Huang-Rhys factor that determines the leading contribution of     

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