芳香性判据研究进展

本文综述了各时期芳香性理论研究及新近的进展,并对各种判据进行评述和展望。     

芳香性判据的研究进展

对上世纪30年代以来国内外专家对芳香性判据的研究成果进行综述，介绍了二十种对有机化合物有无芳香性的判断方法。     

芳香性判据研究的最新进展

介绍了芳香性判据研究的发展概况与最新研究成果。     

芳香性新判据——拓扑共振能

介绍了芳香性判据研究的最新成果拓扑共振能及其应用。     

芳香性的新简易定量判据应用与计算

提出芳香性新定量判据FE_π,并以简易公式FE_π=E_π~环,-sum from i=1 (2nβ RE′)/D_i-0.1∑π_e-6/6计算了75个(苯系、稠环、轮烯、辐射多烯)分子场效应势能。结果同实测能量参数及REPE值相符,并进行讨论。     

有机化合物的芳香性判据

芳香性是有机化学领域的重要概念,其应用与适用范围日益扩大。本文对几类有机化合物芳香性判据,作了概述。     

五员杂环化合物的芳香性及其稳定性

从结构的观点，用符合芳香性的四个判据判别了五员杂环化合物的芳香性，并对其稳定性顺序给予了理论上的解释。     

五员杂环化合物的芳香性及其稳定性

从结构的观点,用符合芳香性的四个判据判别了五员杂环化合物的芳香性,并对其稳定性顺序给予了理论上的解释.     

全金属芳香性研究进展

芳香性是化学中的一个重要概念,已由有机化合物延伸到全金属簇和合金中.在全金属簇中,不仅有p芳香性,还有s芳香性和d芳香性.解释了多重芳香性、多重反芳香性和对抗芳香性概念,并介绍了三种芳香性的判据.     

非相关性化学位移——新的芳香性的磁学判据

本文概述了对芳香性认识的以及各种芳香性判据的优缺点,介绍了非相关性化学位移(Nucleus-Independent Chemical Shifts)以及相关性化学位移(NICS)的解析技术和应用.     

翻译标准之争及简评

本文简要介绍和评价了具有代表性的翻译标准 ,探讨这些标准对翻译理论发展以及对翻译实践评价可能起到的作用     

TWO BASIC TYPES OF CRITERIA FOR LEXICAL AMBIGUITY

The purpose of this paper is to try to clarify the notion of Iexical ambiguity, and discuss possible diagnostic criteria.     

CRITERIA AND PROCEDURES FOR THE RECOGNITION OF FOREIGN QUALIFICATIONS

The criteria and procedures for the recognition of foreign qualifications are not sufficiently known to most evaiuators of foreign qualifications. This lack of knowledge results in inappropriate and incorrect evaluations and recognition decisions. The purpose of this article is to explain who evaluates and reaches decisions as to foreign qualifications, what the role of national recognition centres is, how such centres co‐operate internationally, and how international co‐operation has led to the advancement of agreed upon methods, criteria, and procedures for the recognition of foreign qualifications. The biggest step forward in this respect is the Draft Recommendation on General Procedures and Criteria for the Evaluation of Foreign Qualifications that was recently developed by an expert group and which, in its final form, will be a subsidiary text of the Council of Europe/UNESCO Convention.     

一类非线性中立型时滞差分方程的振动性

讨论了一类非线性带可变系数中立型时滞差分方程的振动性,得到了此方程振动的一个充分性准则,从而丰富并推广了最近文献中已有的结论．     

OSCILLATORY CRITERIA FOR A CLASS OF EVEN ORDER NONLINEAR FUNCTIONAL DIFFERENTIAL EQUATION

<正> In this paper we consider the following nth order nonlinear functional differential equation x~(n)(t)+integral from n=1 to ∞p(t,ξ)f(x(t),x[g(t,ξ)])do(ξ)=0(n even,n≧2,b>a) (1) Oscillations of this equation are studied.We make the     

CRITERIA FOR STUDENT ENGINEERING CREATIVITY AND THEIR RELATIONSHIP TO COLLEGE GRADES1

The creativity of engineering students was assessed through divergent problems relevant to engineering content. These problems were constructed, administered and scored by faculty members from the mechanical (ME), civil (CE), and electrical (EE) engineering departments at a large university. The problems, administered to 60 MEs, 81 CEs, and 173 EEs, were scored on the basis of the number of solutions (fluency), the number of categories of solutions (flexibility), the originality of the solutions (novelty), and the appropriateness of the solutions (appropriateness). Interrater reliabilities indicated that the fluency and flexibility scores were sufficiently reliable; the novelty and appropriateness scores were less so. The adequacy of substituting the fluency score in lieu of the novelty score was discussed. No significant relationships were found between creativity and grade point average (GPA).