活性胺单体对紫外光固化涂料氧阻聚效应抑制作用的…

本文研究了活性胺单体对紫外光固化涂料氧阻聚效应的抑制作用。结果表明：抑制作用是由于胺类分子中具有活性α－Ｈ，胺类分子结构中供电子取代基对α－Ｈ有致钝作用，吸电子取代基能使α－Ｈ致活；同时，胺类分子迁移至表面的能力对抑制氧阻聚效应的作用有显著影响。     

16α取代雌二醇与雌激素受体ER结合活性的量子化学研究

应用从头算方法(HF／STO-3G)计算了25个16α取代雌二醇的电子结构,研究了化合物的电子结构与活性(Relative Binding Aiffinities)的定量关系,结果表明：(1)前线轨道集中在雌二醇衍生物的活性中心A环、3-OH和17-OH上;(2)支持了17-OH、3-OH与受体形成氢键的观点;(3)16α位引入取代基对17-OH产生空间位阻．取代基体积增大,空间位阻增大,活性降低;(4)16α位的取代基与17-OH形成分子内氢键将使活性降低．     

金属羰基化合物氧原子转移反应动力学和机理研究的信息与进展(二)

续上饶《上饶师专学报》１９９８年第６期）２．５信息之五氧转移试剂（ＲＡ－Ｏ）的Ａ－Ｏ键能及其取代基的性质是影响其反应活性的重要因素。２．５．１取代基的推电子性能增大胺类Ｎ－氧化物反应活性氧转移反应研究中最为吸引人的问题之一，是试图了解转移试剂的什么性...     

聚炔烃的极化率及其与多烯的比较研究

采用引入外电场微扰的量子化学方法计算了聚炔烃Ｈ—［Ｃ≡Ｃ—］ｎ—Ｈ（ｎ＝１～２４）的电子极化率．讨论了聚炔烃分子的单位极化率，αＴ／ｎ和αＴ／ｎ，随碳链增长的变化规律；并将聚炔烃电子的极化率与多烯的电子极化率进行了比较研究，结果表明聚炔烃单位极化率小于多烯单位极化率，而分子极化率中π－电子所占比例是聚炔烃大于多烯．     

吡啶偶氮有机试剂取代基效应的简单分子轨道法解释

ＰＡＰ［２－（２－Ｐｙｒｉｄｒｌ）ａｚｏｐ ｈｅｎｏｌ］试剂的取代基效应可通过ＰＭＯ法的处理来讨论．应用这 个方法，可得到带有各种取代基的ＰＡＰ分子轨道及其相应的能量，并进一步指明影响ＰＡＰ类有机 试剂分子的吸收谱带波长，积分吸收强度和－ＯＨ的Ｈ＋电离度的主要因素是：取代基的轨道能量 （ａｓ），取代基与母体相连接原子间的π键强度（βｉｓ）和被取代位置原子参与各分子轨道（母体）的 成分（Ｃ２ｋｉ）．     

聚炔烃的极化率与其与多烯的比较研究

采用引入电场微扰的量子化学方法计算了聚炔烃Ｈ－（Ｃ＝Ｃ－）ｎ－Ｈ（ｎ＝１－２４）的电子极化率,讨论了聚炔烃分子的单位极化率α＾Ｔ／ｎ和α＾Ｔ／ｎ随碳链增长的变化规律,并将聚炔烃电子的极化率与多烯烃的电子极化率进行了比较研究,结果表明聚炔烃单位极化率小于多烯单位极化率,而分子极化率由π－电子所占比例是聚炔烃大于多烯。     

聚四芳基锰卟啉催化氧化环己烷的性能

合成了在苯环２，５位带有不同取代基（ＣＨ３、ＣＨ３Ｏ、Ｃｌ、Ｂｒ或Ｈ）的６种聚四芳基锰卟啉ｐ－ＰｏｌｙＴ（２，５－２Ｒ）ＰＰＭｎＣｌ和ｍ－ＰｏｌｙＴＰＰＭｎＣｌ，考察了它们催化ＰｈＩＯ氧化环己烷的性能，结果表明：这些聚四芳基锰卟啉具有显著的抗氧化稳定性，带供电子基的聚合物催化速度较快，选择性较好     

环氧乙烷与芳胺作用制备分散染料的中间体

用环氧乙烷与芳胺一苯胺,间甲苯胺,间氯苯胺,Ｎ－乙基苯胺等在常压下作用,制备了 七种Ｎ－乙醇基氨基衍生物。初步找出了一些反应条件,如胺类与坏氧乙烷用量的比例,环 氧乙烷通入的速度对引入一取代物或二取代物以及对产率的影响,芳核上的取代基对胺类 反应的活泼性的影响等。     

相转移催化法合成N—1—芳基,—乙酰基,—羧甲氧烷基苯？…

报道了以聚乙二醇为相转移催化剂合成１－（１－Ｈ－本并三唑基）－２，４－二硝基苯，１－「α－（１－Ｈ－苯并三唑基）」乙酰苯并三唑和两个１－（１－Ｈ－苯并三唑基）烷氧乙酸。本法反应时间短，产率令人满意。初步的生物活性测定结果表明，化合物Ⅰ，Ⅲａ和Ⅲｂ均具有较强的抑菌作用。     

取代基对羧酸酸性强弱影响的分析

在有机化学中，一些按酸化合物，当其分子链上的取代基种类或位置不同时，都会引起其酸性强度改变。在数学、科研中常常遇到这类问题。本文从电性效应（诱导及共轭）、立体效应和场效应几方面来讨论取代基对羧酸酸性影响的规律。一、诱导效应（inductiveeffect）的影响在饱和一元验酸中，烷基上的氢原子被电负性大的吸电子基团如卤素、硝基、羟基等取代后，由于这些取代基的吸电子作用，使成键电子云向取代基方向偏移，使按羟基氢原子易于电离，同时使所形成的核酸根负离子的负电荷得以分散而稳定，导致酸性增强。取代基的吸电子能力越强，…     

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.     

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