分光光度法测定空气中甲硫醇

本文建立了分光光度法测定空气中的甲硫醇。其原理:在强酸性溶液中甲硫醇与对二甲胺基苯胺,氯化铁反应生成红色络合物,比色定量。本文概要叙述了标准样品甲硫醇铅合成、定性鉴定及甲硫醇铅配制甲硫醇气体的方法。分别用液体标准和气体标准做标准曲线进行对比。该法所配制的气体不仅适用于比色法,也为气相色谱法提供了一个较好的配气方法;对方法的稳定性、回收率及其它气体的干扰等,进行了讨论。该方法的摩尔消光系数为1.34×10~4。成功地测定出臭气中甲硫醇含量。     

元素分析仪测定低含碳量土壤样品方法的改进

元素分析仪广泛应用于土壤全碳含量的测定.土壤黑炭由于其含量过低,利用元素分析仪自带的曲线范围,无法准确测定.因此,通过测定不同质量的低含碳量标准土,利用仪器积分面积与含碳量的线性关系,绘制线性响应范围更宽的标准曲线,达到准确测定土壤黑炭含量的目的.结果表明,新标准曲线线性良好(R2=1.000 0),准确性和精密度均符合分析要求.利用该曲线对实际土壤黑炭样品进行测定,重现性良好,可应用于土壤中黑炭的含量测定.     

氢化物发生-原子荧光光谱法测定饮用水中锡

应用氢化物发生-原子荧光光谱法测定饮用水中锡,此法准确度、精密度令人满意.实验选定最佳工作条件载气400mL/min,屏蔽气800mL/min,灯电流60mA,负高压-320V.方法检出限为0.34μg/L,线性范围为(0～40.0)μg/L.目前测定饮用水中的锡国家还没有制定标准检验方法,本文的工作可为饮用水中锡的标准检验方法的制定做些探索.     

有机化合物中氧的快速微量分析

按照Schtze-Unterzaucher方法基础进行有机氧元素定量分析,仍被公认为可靠的分析方法。 方法中所采用的载气是氮气,净化剂有500℃还原铜、1120℃碳或900℃铂-碳、活性铜以及海绵铜等。 1964年,Blom等发现了在氮流下新填充的碳层转化水为一氧化碳在三天后即失去活性;他们应用氩代氮为载气,大大地提高了碳的活性。但也带来了以下的问题:在氩流下碳与石英燃烧管作用使空白值增高(C+SiO_2→CO+SiO)。1966年Pella对应用氩作为载气测定有机氧元素做了比较深入的工作,指出历来应用氩为载气测定有机氧元素的困难有二:一是如何除去氩中之微量氧,二是在氩存在下热解产物与石英管将进行反应。Pella采用     

氮分子第二正带系振子强度的激波管测量

利用激波管加热实验气体的方法测定了氮分子第二正常系的振子强度。测量在反射激波区进行,激波管中产生6038—6160°K的高温热平衡气体。在反射激波后,(1,4)带的辐射强度随时间呈线性增加,用光电方法记录了这种变化。该带的辐射强度用标准光源作了校准。振子强度的测量值为0.165。     

吸收塔气相流量对气相总传质系数的影响

本实验采用安捷伦6820气相色谱仪,氢火焰离子化检测器(F ID),DB-5石英毛细管色谱柱(30m×0.45mm×0.42μm),测定空气和丙酮混合气中丙酮的含量;气相色谱条件为:柱温110℃、进样口温度150℃、检测器温度250℃,氮气为载气,流速1.12mL/m in,分流比14∶1,并绘制出丙酮摩尔分率与峰面积数的标准曲线,相关系数r=0.99967,回收率为100.0%~100.1%。实验采用清水作为吸收剂,吸收空气和丙酮混合气体中的丙酮;通过改变气相流量,用气相色谱仪测定填料吸收塔进口及出口气体丙酮的浓度,得出气相总传质系数K ya与气相流量G的关系曲线,为化工吸收的稳定操作提供有用参考。     

NH3-TPD法表征固体催化剂的酸性

采用NH3-TPD法,利用FINESORB-3010程序升温化学吸附仪测定固体催化剂表面酸性.研究样品量、样品的预处理、炉温和程序升温速率、反应气和载气流速、桥电流设置以及气体选择等对测定固体催化剂酸性的影响.     

富氮化合物类烟火药剂燃烧气体环保性研究进展

介绍了富氮化合物类新型烟火气体发生剂燃烧产生的主要有害气体,综述了目前国内外关于典型烟火药剂燃烧气体定性和定量检测的研究进展,阐述了富氮化合物类新型烟火气体发生剂燃烧气体的各种去毒化技术手段,最后对富氮化合物类烟火药剂燃烧气体的进一步环保排放做了展望.      

热风炉自身预热法陶瓷燃烧器的冷态试验研究

针对热风炉陶瓷燃烧器使用不同预热温度的空气与煤气在燃烧过程中的行为做了冷态模拟试验测定，结果表明，自身预热法由于空气预热温度高，燃烧条件变化大，导至火焰变短，并产生较强烈的低频脉动燃烧。在对燃烧器出口做了改进后，可大大降低燃烧脉动，保证了燃烧稳定。     

离子交换膜电解气体分析方法的改进

石河子天业化工公司离子交换膜电解气体分析的方法采用的是气相色谱分析法,分析用载气为高纯氦气,单样分析时间长,成本高(2 000元/瓶),通过改进方法以降低分析成本,用高纯氩或纯氢代替现在色谱仪用的高纯氦做载气。     

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