棕榈酸葡甘聚糖酯的合成及取代度的测定

采用无溶剂法合成表面活性剂——棕榈酸葡甘聚糖酯(PKGM),并选择无毒复合溶剂进行分离、精制.实验确定最佳合成条件为:KGM∶EP质量比为8∶15,碳酸钠质量含量为1.0%,棕榈酸钠为13.5%,甘油为5%,反应时间2.5 h,反应温度120~130℃.在此条件下,PKGM的产率为63.9%,取代度0.48.产物的红外吸收光谱图显示3400、1642、1077 cm-1等处与羟基有关的吸收峰明显减弱,1739cm-1处酯羰基伸缩振动吸收峰显著增强,并在719 cm-1处出现长链亚甲基的面内摇摆振动峰,由此证明PKGM的生成.依据对反应物KGM与产物PKGM红外谱图上羟基和羰基峰的吸收强度的测定及理论推导,计算出了产物的取代度,该方法新颖、便捷,且理论上可行.     

辛烯基琥珀酸淀粉酯浆料的制备研究

通过正交试验,探讨了反应温度、体系pH值、反应时间和淀粉乳浓度对取代度的影响,得出辛烯基琥珀酸淀粉酯制备的最佳工艺条件为:反应温度35℃、体系pH值8.5、反应时间3h、淀粉乳浓度40%.且辛烯基琥珀酸淀粉酯的红外光谱图显示在1 570.06cm-1和1 726.34cm-1处出现RCOO-和C=O的特征吸收峰,表明淀粉分子上引入了酯基和羧酸基.     

丁基膦酸单丁酯稀土络合物的振动光谱研究

用稀土氯化物与丁基膦酸二丁酯反应制备了标题络合物Ln(BBP)3(Ln=La,Eu,Yb),测量了络合物4 000~100 cm-1的红外光谱和1 500~100 cm-1的拉曼光谱,对其主要红外吸收和拉曼谱带进行了归属.指认151cm-1的红外吸收带为Ln—O键的伸缩振动带,1 138 cm-1的红外吸收和1 136 cm-1的拉曼谱带为PO2基团的反对称伸缩振动带(aνsPO2),1 088 cm-1的红外吸收谱带为PO2基团的对称伸缩振动带(sνPO2).提出了络合物的每个稀土离子与邻近的三个稀土离子通过双—O—P(C4H9)(O C4H9)—O—桥相连接,形成“双桥二十四元环”多聚网络结构的假设模型.Ln—O键基本上为离子键.     

小麦壳的差热分析与红外光谱分析

对麦壳的热重曲线、差热曲线进行了分析,并对麦壳的红外光谱分析.加热250℃时质量损失约7%,250￣310℃时质量损失约50%,到460℃质量仅余约12%.在325℃、430℃分别有两个放热峰.麦壳的红外吸收光谱图主要由碳水化合物如木质素、纤维素等吸收带组成.1735cm-1和1615cm-1处的吸收峰是由C=O的伸缩振动引起的;1515cm-1的吸收峰是苯环的骨架振动峰,1243cm-1处是苯羟基中C-O的伸缩振动峰.     

变压器油纸绝缘热老化过程的中红外光谱特性

以变压器油和绝缘纸为研究对象,在实验室中进行了加速热老化实验。运用傅立叶红外光谱仪扫描不同老化时间样品的红外光谱,绝缘纸在波数3 346cm-1处的O—H伸缩振动吸收随着老化时间有明显的减弱现象,可作为判定绝缘纸老化的特征量,为今后实际变压器中绝缘纸老化状态的中红外监测提供一定的依据。绝缘油在3 006cm-1和1 740cm-1附近分别出现C=C和C=O基团吸收峰,且随老化时间的延续其吸收峰强度增加。该文对油纸绝缘的中红外光谱进行分析,从分子官能团角度去探索了油纸绝缘老化的过程和机理。     

粒毛盘菌多糖纯化、硫酸酯化修饰及抗氧化活性评价

文章以粒毛盘菌(Lachnum)为试验菌株,对其胞外多糖(LEP)进行纯化,并对获得的均一组分LEP-1进行硫酸酯化修饰,对修饰前多糖(LEP-1)和修饰后多糖(SLEP-1)进行了扫描电子显微镜、紫外和红外光谱表征,同时评价了两者的体外抗氧化活性。结果表明:LEP-1是由葡萄糖和甘露糖组成的杂多糖,分子量约为473kDa;SLEP-1的硫酸根取代度(DS)为1.97;SEM图显示修饰前后多糖表面形态由片状变化为网状;LEP-1的红外光谱图中有多糖的特征吸收峰,SLEP-1的红外光谱图除多糖的特征吸收峰外,在1 220cm-1和818cm-1处出现硫酸基团的特征吸收峰;LEP-1和SLEP-1对·OH、DPPH·和O2-·有很强的清除作用,SLEP-1的清除能力大于LEP-1,两者均呈现一定的剂量效应关系。因此,LEP-1和SLEP-1均有明显的抗氧化活性,且可作为天然抗氧化剂应用于食品和医药行业。     

针状纳米CaCO3的红外光谱分析

对用液相法制备的纳米CaCO3粉末分别用XRD,TEM,IR进行了表征.实验发现,制备的纳米CaCO3呈针状,且分散性较好,为六角晶系的方解石结构.纳米CaCO3粉末的三个IR吸收峰均存在不同程度的蓝移,其中以1 437.3 cm-1处的C-O伸缩振动吸收峰最为明显,达30cm-1.同时,此吸收峰还出现了宽频带强吸收现象.文中对纳米CaCO3粉末红外光谱的变化情况进行了详细的分析讨论.     

氯仿对芳香胺氨基红外吸收峰的影响

测定了18种芳香胺在氯仿中的红外光谱,发现在氯仿中芳香胺的浓度对氨基振动吸收峰没有明显的影响,但大部分芳香胺氨基的对称和非对称伸缩振动吸收峰发生裂分,有些出现肩峰。     

Ni掺杂对La1.85 Sr0.15 CuO4-δ和Bi1.8 Pb0.2 Sr1.6 La0.4 CuOy体系的物理性质的不同影响

利用XRD,红外光谱以及电阻率等实验手段,对La1 85Sr0.15Cu1-xNixO4-δ(0≤x≤0.3)和Bi1.8Pb0.2Sr1.6La0.4Cu1-xNixOy(O≤x≤0.4)系列样品进行了研究.结果表明:在整个掺杂范围内两个体系样品均保持四方晶相.对于La1.85Sr0.15Cu1-xNixO5-δ体系,所有样品的红外光谱图在504 cm-1左右都有一个吸收峰,在高掺杂时,体系的红外光谱在681 cm-1左右有一个吸收峰.而对于Bi1.8Pb0.2Sr1.6La0.4Cu1-xNixOy体系来讲,所有样品的红外光谱图在600 cm-1左右都有一个吸收峰,当体系载流子浓度低时,在480 cm-1左右出现吸收峰.Ni掺杂对两个体系超导电性都有较强的抑制作用.本文对两个体系样品不同掺杂区的声子振动和输运性质进行了分析和讨论.     

枸杞多糖硫酸酯化修饰及其对Hela细胞的体外抑制作用

通过L_9(3)~4正交设计对氯磺酸-吡啶法制备枸杞多糖硫酸酯(SLBP)的修饰条件进行优选,最佳条件为V(氯磺酸):V(吡啶)=1:4,反应温度80 ℃,反应时间2 h.枸杞多糖硫酸酯中硫的质量分数可达17.23%,硫酸基取代度可达1.935.以紫外和红外光谱对产物加以表征,并用MTT法测定了对Hela细胞体外生长的抑制作用.在25～200 mg/L内,枸杞多糖(LBP)对人宫颈癌(Hela)细胞生长几乎没有抑制作用,而枸杞多糖硫酸酯对Hela细胞的抑制率可达31.71%.用本方法所制备的枸杞多糖硫酸酯具有较高的含硫量和硫酸基取代度,对Hela细胞生长具有明显的抑制作用,其抑制率与硫酸基取代度和用药剂量呈正相关.     

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.     

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     

Journal of Donghua University ( English Edition) Contents of Volume 31

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