铝青铜中铝铁锰镍锌含量的测定方法研究

建立了ICP—AES法测定铝青铜样品中的铝、铁,锰,镍,锌五种合金元素的方法。详细考察了高含量的铜基体对测定结果的影响,并以铝青铜标准样品考察了测定结果的准确度,各元素与标准值的相对标准偏差为0．44％-7．73％,以未知样品用加标回收的方法评价了该方法的准确性,加标回收率为86．12％～157．0％。该方法准确度高,精密度好,简单快速,无需考虑基体的影响。     

有机氧同位素组成的在线测定方法

通过在不同条件下对几种标准有机物的实验对比，确定了利用质谱-元素分析仪联机系统测定有机物氧同位素组成的最佳实验条件。结果表明：当GC温度为85℃，炉温为1325％，载气氦压为0．08—0．10MPa，高压为3kV，参考气CO的压力为0．05MPa时，测定的实验结果误差小于0．05％，达到实验要求。     

用端视ICP-AES法测定生活水中的多种微量元素

采用端视ICP光谱法测定水中的微量元素。选择了仪器工作条件：功率在950W时测定Ag、Al，在1150W时测定Cu、Cd、Pb、Zn、Fe、Mn、Al、Cr，雾化压力为0．14Pa，进样量在1．2～1．8ml／min。分析线为Cu324．7nm、Cd228．8nm、Pb220．3nm、Fe259．9nm、Zn213．8m、Mn257．6nm、Cr205．5nm、Ag328．0nm、Al396．1nm，测定了各元素的检出限，结果为铜、铅、锌、镉、铁、银、铬、铝、锰的测定下限分别为(μg/l)：2．0、10．0、1．0、2．0、2．5、15．0、3．0、25．0、1．5；测得加标回收试验回收率为94％～101％；样品测定的相对标准偏差为0．67％～3．42％；水中常见元素对各元素测定的干扰可以不计；测定了涪江原水、出厂水、管网水等样品。     

γ谱法和ICP-MS法测定黄土样品中铀、钍含量的比较

用γ谱法对黄土样品进行了U、Th、K的元素含量测定，与等离子质谱(ICP—MS)分析方法的结果进行了比较．结果表明，两种测定方法分析结果相符，偏差大多数在10％以内．γ谱法的3次平均结果与等离子质谱分析方法的误差在1％以内．     

ICP—OES法对葡萄酒中14种微量元素含量的测定

采用电感耦合等离子体原子发射光谱（ICP—OES）法对葡萄酒中14种元素含量进行测定,对样品前处理方法和检测条件进行了研究,建立了一套完整的分析方法．样品前处理采用80qC水浴加热除去酒精,加入硝酸和双氧水对样品进行消解,此方法简单易行,元素损失少．用ICP—OES法测定葡萄酒中14种元素含量,标准曲线的线性关系良好,检出限低,回收率为92．0％一109．4％,精密度为0．54％一4．25％,测定结果令人满意．     

离子选择电极法测定矿物饲料及矿物肥料中的氟

介绍了测定矿物饲料和矿物肥料中氟含量的通用方法——氟离子选择电极法．探讨了酸溶氟作为有效氟的合理性．通过碱熔-酸提取、盐酸-电热板直接加热、盐酸-水浴加热、盐酸-常温4种溶样方式的比较,选择盐酸-电热板直接加热溶解样品,验证了盐酸溶解样品的可行性．通过调整溶液pH值和采用柠檬酸钠做抗干扰剂和总离子强度缓冲剂,基本消除了基体和共存元素的干扰．用该方法每隔0．5h测定1次样品电位值,4个样品连续4h测定结果的RSD分别为8．4％,7．5％,9．32%,7．38％（n=8）,回收率在93．8％～103．7％．该方法操作简便易行,结果令人满意．     

电感耦合等离子体发射光谱法(ICP-AES)测定铀矿石中微量钪、硒、铼

用HF—HNO3—HClO4溶解样品，在0．6mol／L盐酸介质中，用ICP—AES法对铀矿石中钪(Sc)、硒(Se)、铼(Re)进行了测定．测得各元素的测定下限分别为：Sc0．03μg/mL、Se0．03μg/mL、Re0．016μg/mL．低、中、高3种浓度的平均标准加入回收率为96％～106％，相对标准偏差小于8％。     

高纯氧化镧ICP-AES摄谱法无基体匹配定量分析方法研究

考察了观测高度为12.5mm时，镧基体对其他共存稀土杂质元素测定的干扰效应，同时采用本研究室提出的光谱干扰系数校正法和浓度干扰因子联合校正技术有效地校正了镧基体效应，准确测定了3种不同镧基体浓度场合共存的14种稀土元素，建立了高纯氧化镧ICP-AES无基体匹配定量分析方法，样品回收率多为90％～110％，RSD％＜6%，该方法可用于纯度低于99．98％氧化镧样品的分析．     

碘化钾分光光度法测定ZLIOIA中锑的含量

本文研究了在1．5—2．5mol／l硫酸介质中，锑（Ⅲ）与碘化钾生成黄色络合物这一显色反应，其最大波长在425nm处，表观摩尔吸光系数e=3．8×10^3，锑含量在0--0．5％范围内符合比耳定律。确定了碘化钾分光光度法测定ZL101A中的锑的最佳条件和消除干扰元素的方法。加标回收率为97．5％-100．0％，标准偏差为0．009％。方法操作简便、准确，易于掌握，能满足快速分析的要求。     

五味子中117种农药多残留气相色谱-串联质谱检测方法研究

建立了五味子中117种农药多残留气相色谱串联质谱（GC-MS／MS）检测方法。样品经乙酸乙酯-乙腈（30：70,v／v）超声振荡提取,凝胶渗透色谱技术（GPC）净化GC—MS／MS测定。117种农药在五味子样品中的最低定量限（LOQ,S／N=10）为0．005-0．2mg／kg。每种农药在五味子基质中,添加0．005-0．2mg／kg范围内（n=5）,回收率为62．1％～122．8％,相对标准偏差（RSD）为3．1%～17．8％。在0．01～5．0μg／mL的浓度范围内,各农药均具有良好线性。     

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.     

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     

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

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