正十二烷醇与环氧乙烷的加成反应动力学研究──最佳反应时间的确定

正十二烷醇与环氧乙烷的加成反应动力学研究──最佳反应时间的确定张仁权,张维冰,李葵英,王万兴（齐齐哈尔轻工学院化工系,齐齐哈尔,１６１００６）关键词正十二烷醇聚氧乙烯醚,碱催化,聚合度在工业生产中脂肪醇与环氧乙烷的加成反应多采用ＫＯＨ和ＮａＯＨ等强碱...     

Active control schemes for aseismic base-isolated structures

Summary  Active control schemes are used for the protection of base-isolated and seismically excited buildings. The desired control objective is to keep the whole structure arbitrarily close to its initial configuration prior to the earthquake. The proposed methods require control force application only at the base of the structure. The controllers developed may depend on information obtained from all the floors or just the first (base) floor alone. Received 13 September 2000; accepted for publication 26 June 2001 RID=" ID=" Dedicated to the memory of Professor P.D. Panagiotopoulos with our warmest prayers. RID=" ID=" The first author wishes to thank Prof. G. Leitmann and Prof. E. Papadopoulos for the numerous helpful discussions. The same author is supported in part by the Institute of Communication and Computer Systems, NTUA, under the program Archimedes 65/1017.     

从高分子化学与衣食住行到高科技发展

本文围绕国际化学年的主题,介绍高分子科学与人类衣食住行、国民经济各个方面的密切关系,结合高分子发展历程、高分子产业现状和高分子学科前沿与发展趋势,概述了高分子科学与技术的基本情况。     

In Silico study of carcinogenic o‐Quinone metabolites derived from polycyclic aromatic hydrocarbons (PAHs)

A computational density functional theory study on the structural and electronic properties of several polycyclic aromatic hydrocarbon (PAH) ortho‐quinones was performed and the possible mechanism of DNA‐adduct formation was analyzed to evaluate its thermodynamic viability. Molecular docking techniques were applied to examine the noncovalent interactions developed when a model PAH ortho‐quinone intercalates between the DNA double helix. Quantum‐chemical ONIOM (our Own N‐layer Integrated molecular Orbital molecular Mechanics) calculations within the structure of a DNA fragment were carried out to evaluate the significant steps of noncovalent complex and covalent adduct formation. The solvent effect was also considered by employing a continuum solvation model. The present calculations suggest that initial noncovalent interactions of the PAH o‐quinone within the DNA double helix could determine the feasibility of benzo[a]pyrene‐7,8‐dione‐DNA covalent adduct formation, and that dispersion‐corrected functionals are more suitable for locating the noncovalent complex. Copyright © 2012 John Wiley & Sons, Ltd.     

The Effects of Project‐Based Learning on Students' Academic Achievement,Attitude, and Retention of Knowledge: The Subject of “Electricity in Our Lives”

The aim of this study is to analyze the effects of project‐based learning on students' academic achievement, attitude, and retention of knowledge in relation to the subject of “Electricity in Our Lives” in a fourth‐grade science course. The study was conducted in a quasi‐experimental design as a “pre‐test, post‐test with control group.” In the experimental group, the unit was taught through the project‐based learning method. The measuring tools were administered to both groups before and after the applications. To perfectly analyze the “process” of the method, seven different learning assessment “forms” were administered to the students. The findings of the forms indicated that the students learn to construct their own learning and to evaluate changes in their own behavior through the application of the method. The application of different methods between both groups had a statistically significant effect in terms of academic achievement, (F(1,112) = 46.78, p = .000) and of retention of knowledge (F(1,112) = 35.24, p = .000). However, there were no statistically significant effects from being in different groups for the attitudes of students (F(1,112) = .99, p = .321). For the students, being in the project‐based learning groups resulted in better academic achievement and retention of knowledge than being in the traditional teaching group.     

介电体超晶格

本文评述在介电体超晶格领域中的主要成果,特别是本实验室所做的工作。自1980年以来,我们将超晶格的概念从半导体推广到介电体,制备了周期和准周期介电体超晶格,实现了二次谐波产生、多波长二次谐波产生、三次谐波产生、光学双稳以及超高频超声波产生。 关键词：介电体超晶格; 非线性光学效应; 二次谐波产生; 光学双稳