用超临界CO2浓缩α—生育酚的试验研究

对利用超临界ＣＯ２从豆油脱臭馏出物中萃取、浓缩生育酚的工业化生产的可行性进行了试验研究,提出了初步的工艺框架,研究了压力、ＣＯ２流量及温度场分布对精馏柱萃取效果的影响。研究结果表明,为了保证α－生育酚的浓缩效果,适宜的萃取压力为１３．５ＭＰａ、ＣＯ２流量为３～５Ｌ／ｍｉｎ,精馏柱温度分布为６０／５０／４０／３５℃（顶／上中／下中／底）。文中对试验提出了进一步完善的措施。     

用超临界CO_2浓缩α生育酚的试验研究

对利用超临界ＣＯ２ 从豆油脱臭馏出物中萃取、浓缩生育酚的工业化生产的可行性进行了试验研究,提出了初步的工艺框架,研究了压力、ＣＯ２ 流量及温度场分布对精馏柱萃取效果的影响－ 研究结果表明,为了保证α生育酚的浓缩效果,适宜的萃取压力为１３－５ ＭＰａ 、ＣＯ２流量为３ ～５ Ｌ／ｍｉｎ ,精馏柱温度分布为６０／５０／４０／３５ ℃（ 顶／ 上中／ 下中／ 底）－ 文中对试验提出了进一步完善的措施     

脲包—皂化法提取大豆油脱臭馏出物中的生育酚

提出了脲包－皂化反应去除脱馏出物中的豆油脂肪酸和甾醇,提取生育酚浓缩物的含量可达48．8％、回收率可达86．1％,而且提取的生育酚的抗氧化活性很高。为工业化利用豆脱臭馏出物中的生育酚提供了一条新的途径。     

超临界CO2萃取条件对α-VE和脂肪酸萃取效果的研究

以豆油脱臭馏出物为原料,利用超临界二氧化碳萃取技术浓缩α-VE,探讨萃取压力、萃取温度和二氧化碳流量对α-VE和豆油脱臭馏出物中几种主要脂肪酸萃取效果的影响,结果表明萃取压力和萃取温度对α-VE和几种主要脂肪酸在超临界二氧化碳中的溶解效果有非常显著的影响,萃取压力增加,萃取得率和α-VE含量随着增加,萃取温度升高,萃取得率下降,而二氧化碳流量对萃取效果影响较小.在萃取温度308K、萃取压力18MPa、二氧化碳流量6～10L/min的萃取条件下,可以获得较高的萃取得率和α-VE浓度.     

超临界CO_2萃取条件对α-V_E和脂肪酸萃取效果的研究

以豆油脱臭馏出物为原料 ,利用超临界二氧化碳萃取技术浓缩α -VE,探讨萃取压力、萃取温度和二氧化碳流量对α -VE 和豆油脱臭馏出物中几种主要脂肪酸萃取效果的影响 ,结果表明 :萃取压力和萃取温度对α -VE 和几种主要脂肪酸在超临界二氧化碳中的溶解效果有非常显著的影响 ,萃取压力增加 ,萃取得率和α -VE 含量随着增加 ,萃取温度升高 ,萃取得率下降 ,而二氧化碳流量对萃取效果影响较小 在萃取温度 30 8K、萃取压力 1 8MPa、二氧化碳流量 6～ 1 0L/min的萃取条件下 ,可以获得较高的萃取得率和α -VE 浓度     

超临界CO2萃取条件对a—VE用脂肪酸萃取效果的研究

以豆油脱臭馏出物为原料,利用超临界二氧化碳萃取技术浓缩a－VE,探讨萃取压力、萃取温度和二氧化碳流量对a－VE和豆油脱臭馏出物中几种主要脂肪酸萃取效果的影响,结果表明：萃取压力和萃取温度时a－VE和几种主要脂肪酸在超临界二氧化碳中的溶解效果有非常显著的影响,萃取压力增加,萃取得率和a－VE含量随着增加,萃取温度升高,萃取得率下降,而二氧化碳流量对萃取效果影响较小。在萃取温度308K、萃取压力18MPa、二氧化碳流量6－10L/min的萃取条件下,可以获得较高的萃取得率和a－VE浓度。     

尿素包合法富集高纯度棉籽油亚油酸甲酯的研究

采用正交实验设计，对尿素包合法富集高纯度棉籽油亚油酸甲酯的工艺条件进行研究，考察了包合温度、包合时间、尿素用量、溶剂配比等因素对产品中亚油酸甲酯含量及收率的影响，找出了最佳工艺条件：以甲醇作溶剂，脂肪酸甲酯：尿素：甲醇＝1：3：8（W／W／V），包合温度为20℃，一次富集产品使亚油酸甲酯的含量从57.96%提高到96.5%。     

尿素包合法纯化α-亚麻酸方法的研究

以亚麻籽油为原料对尿素包合法纯化α-亚麻酸的工艺条件进行研究.采用单因素实验考察包合时间、包合温度、尿素与脂肪酸质量比、甲醇体积与尿素质量比对提取α-亚麻酸的影响,同时采用响应曲面法分析建立二次回归模型,对影响因素包合时间、尿素与脂肪酸质量比、甲醇体积与尿素质量比进行优化组合.以产物中α-亚麻酸质量浓度为指标,确定了尿素包合法提取α-亚麻酸的最佳工艺条件,即包合时间12.80 h,尿素与脂肪酸质量比为2.82,甲醇体积与尿素的质量比为2.44mL/g,该工艺制备α-亚麻酸质量浓度为179.96μg/mL.采用紫外光谱检测将样品与标准品进行对照,确定样品为α-亚麻酸.     

α—生育酚在超临界CO2中溶解度神经网络模型的建立

生育酚有很高的生理活性,油脂生产中得到的脱馏出物含有丰富的天然生育酚。作为萃取生育酚的基础,对甲酯化油脂脱臭馏出物中α－生育酚在超临界CO2中的溶解度进行了测试,并用Chrastil分子合模型和RBF神经网络模型对溶解度数据进行了拟合。Chrastil分子合模型的相对误差为25．36％。对RBF神经网络模型,经过网络学习和训练,训练集平均误差仅为0．23％,测试集误差为6．48％,效果比较理想。     

天然VE的超临界CO2萃取与浓缩的试验研究

我校开发的“天然VE 的超临界CO2 萃取与浓缩的试验研究”技术日前通过省科技厅组织的鉴定 其针对以往植物油脂脱臭馏出物中VE 提取分离时存在的问题 ,以超临界CO2 萃取和尿素包合为主要技术手段 ,进行了一系列基础性的研究工作 ,取得了有效的成果 ,完成了维生素E油微胶囊制备技术的研究 经同行专家鉴定 ,该成果经济效益良好 ,有较好的应用前景 ,在国内处于领先水平 天然V_E的超临界CO_2萃取与浓缩的试验研究@唐恒$江苏大学科技处     

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