新型矿用气相色谱仪气路系统

现有的矿用气相色谱仪在分析速度和精度方面存在着不足。通过对矿用气相色谱仪气路系统的分析研究,引用色谱柱塔板理论以及速率理论,结合在实际工作中积累的经验,首次提出一种新型的气路系统——采用毛细管色谱柱与双柱箱结合的研究方案。该方案通过实验分析,给出各通道色谱图以及精确度的相对标准偏差。结果表明:采用毛细管色谱柱与双柱箱结合的气路系统,其相对标准偏差最大为为0.98%,分析时间为7.5 min,与国内现有矿用气相色谱仪的相对标准偏差1.2%、分析时间12 min相比,在分析精度与分析速度方面有较大提高,能够应用于煤炭自燃火灾的防治中,可以为煤炭自燃的防治提供快速精确的气体分析数据。     

荷叶香气成分的研究（Ⅰ）：荷叶天然香气成分的分析

用XAD-2型树脂采集荷叶天然香气。以双柱毛细管GC/MS/DS联用法和三柱毛细管保留指数法分离鉴定了87种组分,占总峰面积的93.26％,其中50种组分是用上述两种方法共同确证的,占总峰面积的81.31％。含量较大的组分有顺-3-己烯醇(40.41％);二苯胺(8.35％);长叶烯(5.6％);正己醇(3.65％),苯(3.12％)。     

较大柱距双柱联合扩展基础设计

现行规范中只有单向偏心单柱扩展基础的设计方法,而工程中经常会遇到双柱共用1个基础的情况.若双柱间距离很小则可近似按单柱扩展基础的设计方法进行设计,若双柱间距离较大则仍按单柱扩展基础的设计方法进行设计是不妥当的.基于此论述了柱距较大的双柱联合扩展基础如何设计并提供了相关算例.     

成盐蒸发富集——气相色谱法分析水中痕量低级脂肪酸

为了适当控制环境水中的脂肪酸含量,必须对各污染源和水系中的脂肪酸进行测定。本文研究了水中痕量低级脂肪酸的富集和测定方法。采用调水样至碱性并过GDX—502柱净化后减压蒸发浓缩步骤,模拟水样回收率为90％左右。气相色谱测定中,采用国产GDX—401树脂 (参考北京石油化工总厂和北京化工研究院内部交流资料)和美国产Porapak(QS树脂涂渍磷酸的双柱定性,GDX—401柱外标法定量。C_2—C_6脂肪酸均在6分钟内出峰,     

胶束动电色谱法分离巴比妥盐混合物

将表面活性剂十二烷基磺酸钠(SDS)直接溶解在硼酸—硼酸盐缓冲溶液中作为胶束,应用动电色谱法分离了巴比妥盐混合物。研究了不同的SDS浓度、缓冲剂浓度和体系的pH值对毛细管色谱柱的柱效能、选择性以及巴比妥盐在毛细管柱中的电泳行为的影响.结果表明:SDS胶束可在不降低柱效能的情况下,提高毛细詈柱对巴比妥盐的选择性,而在较高的SDS浓度下,各巴比妥盐的电泳行为及其在毛细管色谱柱中的分离效果,取决于它们在胶束和水溶液两相中的不同分配比。     

硫酸钡改性新型甲基化环糊精毛细管色谱柱柱行为的研究

在硫酸钡微晶对毛细管内壁改性的基础上,系统制备了甲基环糊精与不同混合固定液的毛细管色谱柱,从柱的分离选择性,惰性,柱效和分析准确性等方面作了较为系统的研究,并对环糊精的分离机理作了初步探索。     

毛细管电泳柱上富集技术研究进展

近年来,改善毛细管电泳灵敏度的相关研究得到了快速发展,可以归结为3个方面,即毛细管电泳联用检测技术、毛细管电泳柱上富集技术以及毛细管电泳与样品前处理联用技术,本文对毛细管电泳柱上富集技术的研究进展进行了综述,以期对相关的研究工作提供参考.     

鄂尔多斯盆地柴窑区延长组油气二次运移动力

计算了浮力要克服毛细管压力所需的连续油柱的高度和长度,发现计算的克服毛细管压力所需油相连续长度远大于目前延长组已发现油藏含油带宽度.因此,浮力无法克服毛细管压力,不能成为研究区长3—长6油层组油气进行二次运移的主要动力.根据平衡深度法,计算了各个层位的孔隙剩余压力.发现自长3油层组之下,各套地层均存在孔隙剩余压力,且在长7油层组达到最大值.源储压力远大于毛细管压力,可以克服毛细管压力而使油气运移.因此孔隙剩余压力是研究区长3—长6油层组油气进行二次运移的主要动力.     

程序升温条件下毛细管短柱和长柱气相色谱保留行为的比较

本文研究了程序升温条件下不同组份在毛细管短柱和长柱中的气相色谱保留行为。提出了长柱和短柱的适用条件。     

浅谈单柱与无柱地铁车站结构设计比较

在目前的地铁工程设计中,明挖法施工的地铁车站一般根据客流的要求确定站台宽度,从而确定车站宽度。车站结构形式按站台宽度的不同主要有单柱、双柱及无柱等几种结构类型,其中,单柱和双柱地铁车站的结构模型、受力状况基本相同。主要从技术、经济的角度对单柱与无柱地铁车站的结构设计进行比较,为今后设计进行单柱和双柱车站结构形式比选时提供一定的借鉴。     

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.     

An Analysis of Catherine＇s Character——Wuthering Heights

Wuthering Heights, Emily Bronte＇s only novel, was published in December of 1847 under the pseudonym Ellis Bell. The book did not gain immediate success, but it is now thought one of the finest novels in the English language. Catherine is the key character of this masterpiece, because everybody and everything center on her though she had a short life. We can understand this masterpiece better if we know Catherine well.     

Lower Paleozoic oil relationships within Williston Basin, Canada

The Williston Basin is a significant petroleum province, containing oil production zones that include the Middle Cambrian to Lower Ordovician, Upper Ordovician, Middle Devonian, Upper Devonian and Mississippian and within the Jurassic and Cretaceous. The oils of the Williston Basin exhibit a wide range of geochemical characteristics defined as "oil families", although the geochemical signature of the Cambrian Deadwood Formation and Lower Ordovician Winnipeg reservoired oils does not match any "oil family". Despite their close stratigraphic proximity, it is evident that the oils of the Lower Palaeozoic within the Williston Basin are distinct. This suggests the presence of a new "oil family" within the Williston Basin. Diagnostic geochemical signatures occur in the gasoline range chromatograms, within saturate fraction gas chromatograms and biomarker fingerprints. However, some of the established criteria and cross-plots that are currently used to segregate oils into distinct genetic families within the basin do not always meet with success, particularly when applied to the Lower Palaeozoic oils of the Deadwood and Winnipeg Formation.     

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     

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