十二烷基苯磺酸钙毛细管色谱柱的制备及其性能考查

用汞塞动态法涂柱制备了十二烷基苯磺酸钙毛细管柱1(固定液浓度为0.095g/mL,柱尺寸为30m×0.32mm)和柱2(固定液浓度为0.10g/mL,柱尺寸为35m×0.25mm),所用的溶剂是丙酮,并对柱性能进行考查.结果表明,这种色谱固定相具有较强的极性和选择性,对于极性有机化合物如脂肪酸、芳香酸、醇、酚等有良好的分离能力,且出峰快,时间短、峰形尖锐对称,可不经衍生直接进样分析.     

对甲苯磺酸三正丁铵色谱固定相对酱油中山梨酸和苯甲酸测定

采用静态法涂柱以对甲苯磺酸三正丁铵做为固定相制备了石英毛细管气相色谱柱(柱尺寸35 m×0.53 mmi.d,液膜厚度为1.0μm,固定液浓度为9.5%,W/V),并对其柱性能进行了考察.实验表明,此种色谱固定相极性较强,对于酱油中的山梨酸和苯甲酸极性具有较好的分离效果,精密度试验,得到的相对标准偏差在0.53%~2.5%之间,线性范围10×10-3g.L-1~250×10-3g.L-1.检出限为4.2×10-3g.L-1,方法回收率为85%~96.1%.     

支链杯[4]芳烃聚硅氧烷固定相的制备及色普性能

合成了一种支链型杯「４」芳烃二丁醚聚硅氨烷毛细管气相色谱固定相,考察了该固定相的色谱性能、柱效、极性、选择性、热稳定性,结果表明：该杯「４」芳烃固定相具有良好的色谱性能,苯类、酚类等芳香族位置异构体均得到良好分离。     

气相色谱固定相十二烷基苯磺酸二正丁铵的研究

用汞塞动态法制备了十二烷基苯磺酸二正丁铵石英毛细管柱(固定液浓度为8.2%,柱尺寸为35 m×0.32 mmi.d.),所用的溶剂是丙酮,并对柱性能进行了考察,结果表明,这种色谱固定相具有较强的极性并对芳香烃、烷烃、羧酸、醇等有机溶质有较好的分离能力.     

十四烷基磷酸钍的合成及气相色谱性能研究

化学键合相色谱固定相是借助于非均相化学反应,将有机分子以共价键形式连接在色谱担体上,如硅胶键合相。它具有耐溶剂洗、热稳定性较好、表面改性灵活等特点,因而广泛应用于色谱分离分析中。但其表面极性点不能完全清除,降低了键合相填料的化学稳定性,致使产品性能重复性差,并影响分离效果。本文采用均相化学反应合成了一种     

手性沸石骨架材料CoAPO-CJ40新型气相色谱固定相的研究

手性沸石材料近年来在对映选择性催化和分离方面越来越引起人们的关注,主要由于该类材料具有独特性能,如高表面积、迷人的结构和优秀的化学和热稳定性.研究合成了一种拥有一维螺旋10环通道的手性沸石开放骨架材料CoAPO-CJ40.使用CoAPO-CJ40作为固定相制备了涂层毛细管手性柱(2 m×75μm i.d.),用于气相色谱分离外消旋体、位置异构体和直链烷烃混合物.选用正十二烷作为分析物在120℃下测定了CoAPO-CJ40涂层柱的理论塔板数为2 665块/米.实验结果表明该手性柱对直链烷烃混合物和位置异构体有较好的选择分离能力,对外消旋化合物也有一定的手性识别能力.     

气相色谱高温液晶固定液的合成和性能——Ⅳ.双-(4,4′-正烷(氧)基联苯甲酸)对苯二酚和联苯二酚双酯类

介绍了五个新型的联苯双酯类高温液晶的合成及性质。该类液晶化合物相变温度高(179～>330℃),热稳定性好(>480℃)。将其用作气相色谱固定液,对分离难度较大的萘胺异构体和萘酚异构体,效果良好。     

HPLC法测定隔山消中没食子酸的含量研究

目的:建立HPLC法测定隔山消中没食子酸的含量.方法:测定没食子酸的色谱条件是Agilent ZOR-BAX SB C18色谱柱(4.6mmxl50mm,51μm),流动相为甲醇-0.4%磷酸水溶液(10:90),检测波长为273nm,流速为1.0ml/min,柱温为25℃.结果:没食子酸在0.05～0.5μg范围内线性关系良好,r值为0.9999,平均回收率为98.46%.RSD为2.56%.结论:本法操作简便、快速、分离效果好、稳定性高、重现性好,为建立隔山消质量标准和进一步研究隔山消提供科学依据.     

~(60)Co-γ辐射制备载体型多孔聚合物气相色谱固定相

用~(60)Co-γ辐射法制备载体型多孔芳类聚合物气相色谱固定相,考察了影响其色谱性能的主要因素.它与目前常用的多孔高分子小球固定相相比,柱效高,热稳定性好,未觉察到静电效应,对烷烃分离速度快,分离度高,色谱峰形对称.     

一种新气相色谱固定相的性能和保留机理研究

用新合成的一种套索冠醚Ｎ，Ｎ双（８甲基喹啉）二氮杂１８冠６作为固定相，涂渍在弹性石英毛细管内，测其拄效、惰性、热稳定性、平均极性及选择性等性质．实验结果表明，它具有良好的色谱性能，中等极性，适用于对醇、卤代苯、芳香烃等位置异构体的分离，并从分子结构和热力学参数等探讨了保留及分离机理．     

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.     

Design and analysis of generic LBS application developing platform

Location based services is promising due to its novel working style and contents.A software platform is proposed to provide application programs of typical location based services and support new applications developing efficiently. The analysis shows that this scheme is easy implemented, low cost and adapt to all kinds of mobile nework system.     

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