溶胶凝胶法制备全丙基-β-CD气相色谱柱的涂渍机理初探

用溶胶凝胶法制备了全丙基-β-CD气相色谱柱,得到了和对应静态柱相当的柱效,并和静态法色谱柱做了对Grob试剂和某些苯系位置异构体分离性能方面的比较.结果显示,这两种方法制备的毛细管气相色谱柱有相似的分离性能.初步探索了用溶胶凝胶法涂渍非端羟基固定相气相色谱毛细管柱的机理,说明了溶胶凝胶前体所形成的三维网状结构对固定相有裹挟作用,这种裹挟作用是固定相涂渍成功的关键因素.     

旋流分离器油水分离机理的数值分析

采用计算流体动力学(CFD)的数值方法研究旋流分离器内的速度场分布,空气柱的产生、发展过程以及油滴粒子的运动轨道,探讨油水旋流分离器的分离机理.模拟结果表明:油水旋流分离器内的流场是三维非对称分布的;空气柱的产生和发展是负压和对流传输共同作用的结果;油滴粒子在径向力、轴向力以及周围湍流脉动流场的共同作用下作随机运动,部分粒子由溢流管排出而得到分离;通过计算溢流管排出的油滴粒子数与进入旋流分离器的油滴粒子总数之比可得到油水旋流分离器的分离效率.模拟结果为进一步研究旋流器特性参数对分离效率的影响和旋流器的结构优化提供了参考.     

咪唑嵌合半胱氨酸修饰固定相制备及色谱应用

利用“点击反应”合成了咪唑嵌合半胱氨酸硅胶固定相SIL-AVI-Cys,并通过热重、红外光谱以及元素分析对材料进行了表征.填充SIL-AVI-Cys色谱柱在分离胞核嘧啶、胞苷、肌苷、尿嘧啶和尿苷等5种亲水性化合物时表现为亲水作用模式,而在分离苯胺和苯酚类物质时则可表现出亲水/反相混合模式特征.通过考察流动相pH值、盐浓度对分析物保留的影响,进一步探讨了该固定相的分离机理.流动相pH值的改变可通过改变分析物的离子化影响其与固定相之间的作用力及其保留行为.流动相中盐浓度的增加,可减弱酸性分析物的保留,而对于碱性和中性分析物则无显著影响.此外,SIL-AVI-Cys色谱柱的分离性能采用酰胺及核酸碱基/核苷类物质进行了表征,并将其进一步应用于奶粉中三聚氰胺的表征和检测.     

γ—氯丙基键合硅胶固定相色谱性能评价

研究了γ－氯丙基键合胶这种弱极性键合相作为色谱固定相在甲醇／水流动相体系下的柱效，动力学曲线及反相性能，显示其良好的色谱性能，以及在对前列腺的分离测定中，有效好的结果。     

随机运动导电粒子对微波腔内电场分布的影响

针对微波腔内不均匀电磁场导致的微波加热不均匀现象,利用金属对微波具有反射的特点,将导电粒子与运动物料相结合,研究了随机运动导电粒子对微波转筒干燥腔内电场分布的影响.利用EDEM与COMSOL软件将运动场与电磁场相耦合,模拟导电粒子的尺寸、数量以及随机运动方式对微波腔内电场分布的影响.结果表明:直径小于20,mm的导电粒子对电场的影响较小;自由随机运动的导电粒子因粒子集聚而恶化微波腔内的电场分布;固定间距的随机运动导电粒子可提高微波腔内的平均电场强度及电场分布的均匀性.     

氯丙基有机-硅胶杂化整体柱的制备及性能研究

研究制备氯丙基功能化的有机-硅胶杂化整体柱,考察不同组成对整体柱聚合结构、渗透性、稳定性和柱效的影响,分析整体柱电渗流变化趋势和电色谱分离性能.所制备的氯丙基杂化硅胶整体柱结构稳定、固定相分布均匀,分离性能良好,包括反相色谱保留、静电荷吸附和电泳等多种模式的协同作用.应用加压电色谱模式,7种烷基苯、8种苯胺类化合物和7种苯甲酸类物质在氯丙基杂化硅胶整体柱中实现基线分离.     

C_(60)-g-(乙二胺基)丙基键合硅胶填充柱毛细管电色谱

建立C60-g-(乙二胺基)丙基键合硅胶填充柱毛细管电色谱法。研究操作条件如流动相组成、pH值对柱电渗流的影响.结果表明填充柱与流动相之间存在着快速平衡,可建立稳定的电色谱方法,并且填充柱可以在pH 2.5-7的范围内提供稳定的电渗流,有利于电色谱分离。     

~(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.     

活性Al_2O_3微色谱柱吸附理论性能研究

本文研究了活性Al2O3微色谱柱分离锂（Li）,使用原子吸收分光光度法（AAS）测定微量锂。改变实验条件,研究了柱径,洗脱方式对柱效的影响,活性Al2O3微色谱柱的吸附容量,吸附机理。     

氯丙基有机一硅胶杂化整体柱的制备及性能研究

研究制备氯丙基功能化的有机一硅胶杂化整体柱，考察不同组成对整体柱聚合结构、渗透性、稳定性和柱效的影响，分析整体柱电渗流变化趋势和电色谱分离性能.所制备的氯丙基杂化硅胶整体柱结构稳定、固定相分布均匀，分离性能良好，包括反相色谱保留、静电荷吸附和电泳等多种模式的协同作用.应用加压电色谱模式。7种烷基苯、8种苯胺类化合物和7种苯甲酸类物质在氯丙基杂化硅胶整体柱中实现基线分离.     

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.     

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.     

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.     

Characterization of Ordovician carbonate reservoirs, southeastern Saskatchewan, Canada

The discovery of the prolific Ordovician Red River reservoirs in 1995 in southeastern Saskatchewan was the catalyst for extensive exploration activity which resulted in the discovery of more than 15 new Red River pools. The best yields of Red River production to date have been from dolomite reservoirs. Understanding the processes of dolomitization is, therefore, crucial for the prediction of the connectivity, spatial distribution and heterogeneity of dolomite reservoirs.The Red River reservoirs in the Midale area consist of 3～4 thin dolomitized zones, with a total thickness of about 20 m, which occur at the top of the Yeoman Formation. Two types of replacement dolomite were recognized in the Red River reservoir: dolomitized burrow infills and dolomitized host matrix. The spatial distribution of dolomite suggests that burrowing organisms played an important role in facilitating the fluid flow in the backfilled sediments. This resulted in penecontemporaneous dolomitization of burrow infills by normal seawater. The dolomite in the host matrix is interpreted as having occurred at shallow burial by evaporitic seawater during precipitation of Lake Almar anhydrite that immediately overlies the Yeoman Formation. However, the low δ18O values of dolomited burrow infills (-5.9‰～ -7.8‰, PDB) and matrix dolomites (-6.6‰～ -8.1‰, avg. -7.4‰ PDB) compared to the estimated values for the late Ordovician marine dolomite could be attributed to modification and alteration of dolomite at higher temperatures during deeper burial, which could also be responsible for its 87Sr/86Sr ratios (0.7084～0.7088) that are higher than suggested for the late Ordovician seawaters (0.7078～0.7080). The trace amounts of saddle dolomite cement in the Red River carbonates are probably related to "cannibalization" of earlier replacement dolomite during the chemical compaction.     

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.     

橡胶颗粒沥青混合料低温抗裂性试验研究

以AC-13级配为基础,将橡胶颗粒代替部分集料掺入混合料中,以低温弯曲试验为评价方法对不同橡胶颗粒掺量下沥青混合料的低温抗裂性进行研究,并引入应变能密度值对混合料的低温抗裂性进行综合评价.试验结果表明:橡胶颗粒沥青混合料试件的破坏微应变均超过2 300,满足冬寒区的技术指标;无论是否掺加橡胶颗粒,随着温度的下降,沥青混合料破坏时的最大弯拉强度增大,弯拉应变降低,劲度模量增大;弯曲应变能密度在胶粒掺量为1%左右时具有较大的弯曲应变能密度值,此时橡胶颗粒沥青混合料具有较好的低温抗裂性.     

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。     

Quantitative trait loci （QTLs） for quality traits related to protein and starch in wheat

Quality traits in wheat （Triticum aestirum L.） were studied by quantitative trait locus （QTL） analysis in a recombinant inbred line （RIL） population, a set of 131 lines derived from Chuan 35050 × Shannong 483 cross （ChSh）. Grains from RILs were assayed for 21 quality traits related to protein and starch. A total of 35 putative QTLs for 19 traits with a single QTL explaining 7.99-40.52% of phenotypic variations were detected on 10 chromosomes, 1D, 2A, 2D, 3B, 3D, 5A, 6A, 6B, 6D, and 7B. The additive effects of 30 QTLs were positive, contributed by Chuan 35050, the remaining 5 QTLs were negative with the additive effect contributed by Shannong 483. For protein traits, 15 QTLs were obtained and most of them were located on chromosomes 1 D, 3B and 6D, while 20 QTLs for starch traits were detected and most of them were located on chromosomes 3D, 6B and 7B. Only 7 QTLs for protein and starch traits were co-located in three regions on chromosomes 1D, 2A and 2D. These protein and starch trait QTLs showed a distinct distribution pattern in certain regions and chromosomes. Twenty-two QTLs were clustered in 6 regions of 5 chromosomes. Two QTL clusters for protein traits were located on chromosomes 1D and 3B, respectively, three clusters for starch traits on chromosomes 3D, 6B and 7B, and one cluster including protein and starch traits on chromosome 1D.     

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.     

The Analects and the Moment in Peking——The influence of a Confucian education system on the personality formation,the way of thinking and the fate of the main characters

0.Preface China has long been boasting of its colorful and immense culture which comprises of Taoism,Confucianism and Buddhism.The interwoven influence among the religions on Chinese way of thinking,on the nation＇s behavior in their social life throughout the long history is beyond list.