苯乙烯对丙酮肟和N，N－二甲基甲酰胺~1HNMR谱溶剂效应的研究

该文在四氯化碳介质中考察了苯乙烯对丙酮肟和Ｎ，Ｎ－二甲基甲酰胺（ＤＭＦ）１ＨＮＭＲ谱的溶剂效应，观察到丙酮肟、ＤＭＦ和苯乙烯的化学位移随苯乙烯的摩尔分数增加而逐渐移向高场，丙酮肟和ＤＭＦ分子中的两个甲基向高场移动的程度不同，而且两个甲基和苯乙烯分子中的苯基的化学位移与混合溶剂中苯乙烯的摩尔分数呈线性关系．     

N,N—二甲基甲酰胺与甲苯相互作用的~1H NMR研究

本文测定了N,N—二甲基甲酰胺(DMF)在甲苯和四氯化碳混合溶剂申随甲苯摩尔分数变化的~1H NMR谱,观察到N,N—二甲基甲酰胺(DMF)分子中的两个甲基和混合溶剂中的甲苯共振吸收峰的化学位移随甲苯摩尔分数增加而逐渐移向高场,而且两个甲基向高场移动的程度不同。发现如果苯环上的氢被甲基取代,DMF分子中的甲基和溶剂分子中的苯基向高场移动的幅度递减,得到了所有化学位移与混合溶剂中甲苯的摩尔分数呈线性关系。     

新型手性衍生化试剂MTPEA^13C NMR的研究

本文通过质子宽带去耦（ＰＢＢＤ）和质子偏共振去耦（ＰＯＲＤ）核磁共振技术；研究了新型手性衍生化试剂２－甲氧基－２－三氟甲基－２－苯基－乙胺（ＭＴＰＥＡ）分子中＾１３Ｃ－＾１Ｈ、＾１３Ｃ－＾１２Ｆ间的耦合作用。在此基础上，报导了ＭＴＰＥＡ分子中各基团的化学位移和＾１３Ｃ－＾１９Ｆ间的一级、二级耦合常数（＾１Ｊ和＾２Ｊ）。     

二乙酰一肟与苯相互作用的~1H核磁共振研究

研究二乙酰一肟在四氯化碳和苯混合溶剂中的１ＨＮＭＲ，观察到二乙酰一肟分子中两个甲基和混合溶剂中苯的共振吸收峰的化学位移随苯的摩尔分数增加而逐渐移向高场，而且两个甲基共振吸收峰向高场移动的程度不同，α甲基的Δδ值较β甲基的Δδ值为大。α甲基和混合溶剂中苯的化学位移与苯的摩尔分数呈线性关系，可用方程δ＝Ａｘ＋Ｂ表示，式中ｘ是混合溶剂中苯的摩尔分数，相关系数Ｒ接近于－１。     

分子动力学模拟研究温度对甲醇缔合体系中氢键和弱氢键作用的影响

利用分子动力学模拟方法研究了不同温度下甲醇缔合体系中氢键与弱氢键的缔合情况．通过模拟与核磁共振实验数据研究表明：（1）强氢键的缔合度与羟基的质子位移变化趋势一致,羟基质子的化学位移直接受缔合度的影响;（2）强氢键在低温下起着主要的作用,致使甲基质子位移处于高场,随着温度升高,强氢键很快减少;（3）在高温下弱氢键对溶液结构慢慢占据主要地位,它的作用是使得甲基质子移向低场,其数目同样随着温度升高而减少,但受温度的影响远小于强氢键。     

1—[5—（3—吡啶）—四唑—2—乙酰基]—4—芳基氨基硫脲及…

本文测定１－［５－（３－吡啶）－四唑－２－乙酰基］－４－芳基氨基硫脲及３－［５－（３－吡啶）－四唑－２－亚甲基］－４－芳基－１，２，４－三唑－５－硫酮等六种化合物的＾１３Ｃ－ＮＭＲ谱。各种＾１３Ｃ－ＮＭＲ化学位移，根据取代基效应，讯号强度以及同模型化合物化学位移对照而确认其归属。     

取代酚—咪唑Weng型环番的合成

用２，６－二（咪唑甲基）－４－氯苯酚分别与邻、间、对－二（溴甲基）苯或２，６－二（溴甲基）吡啶反应，合成了一类新型的取代酚－咪唑Ｗｅｎｇ型环番。所有化合物均被ＭＳ，＾１ＨＮＭＲ，ＩＲ和元素分析证实。     

苯乙烯对丙酮肟@H核磁共振的影响研究

研究了丙酮肟在四氯化碳和苯乙烯混合溶剂中随苯乙烯摩尔分数变化的^1HNMR，观察到丙酮肟分子中两个甲基共振峰的化学位移随苯乙烯摩尔分数增加而逐渐移向高场，而且两个甲基向高场移动的程度不同．ASIS值随苯乙烯摩尔分数增加而增加，两个甲基共振峰在四氯化碳中是一个单峰，而且当混合溶剂中苯乙烯的摩尔分数大于0.30时分裂为双峰．丙酮肟分子中两个甲基共振峰化学位移δ与混合溶剂中苯乙烯的摩尔分数呈良好的线性关系．     

3－羟基－2－丁酮、二丙酮醇在几种溶剂中的红外光谱研究

本文测定了３－羟基－２．丁酮（ａｃｅｔｏｉｎ）、二丙酮醇（ＤＡ）在四氯化碳、正庚烷、苯和１，２－二氯乙烷等中的红外光谱（３８００—３１００ｃｍ￣（－１））．根据谱峰的强度和峰位的变化，证实了ａｃｅｔｏｉｎ在溶液中能形成较稳定的五元环分子内缔合体，二丙酮醇可形成六元环分子内缔合体．另外，对甲醇、正了醇与ａｃｅｔｏｉｎ在四氯化碳中相互作用的红外光谱也进行了研究，结果表明，ａｃｅｔｏｉｎ分子中羰基和羟基的相互作用，使得自由基的吸收峰移向低频（△γ＝２０ｃｍ￣（－１）），同时羰基醇中羰基接受质子的能力亦被增强．     

化合物N—（2‘,4’,5‘—三氯）苯基—2—羟基—3,5,6—三氯苯磺 …

使用半径验分子轨道计算得到了化合物Ｎ－（２’４‘,５’－三氯）苯甘－２－羟基－３,５,６－三氯苯磺酰胺的一些电子性质,用分子力学程序ＭＭＰ２得到了该化合物的分子几何构型和稳定构象。计算时参数取自对分子Ｎ－甲基甲基磺酸胺的ａｂｉｎｉｔｉｏ计算研究和Ｘ－光晶体衍射结果。研究表明：原子Ｓ和Ｎ形成ｄ－ｐ配价键,通过此键,其电子进一步与两边的取代苯环共轭,ｄ－ｐ配价键对分子中的电子离域可能起着一个重要的桥梁     

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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