化学分析实验中的容量误差

通过对１２家化学分析实验室的小容量玻璃量器的检定结果分析,指出了化学实验中容量误差被忽略的２及消除容量误差的重要性,提出了减少容量误差的可行途径。     

普通高中教师在计算机辅助化学教学中基本情况的调查分析

为了更好地发挥计算机在辅助化学教学中的作用,问卷调查了普通高中教师在计算机辅助化学教学中的基本情况。说明在化学教学中开展计算机辅助具有一定的条件支持,教师可以考虑开展基于积件的计算机辅助教学,选择适当的教学内容进行,并与传统教学方式达到最佳组合,多进行师生间的沟通,从而使计算机辅助教学能够更好地促进学生的发展。     

浅谈体校化学教学中的创新精神教育

传统的应试教育不利于培养学生的创新精神，反而压抑了其创造性。以开发创造力、培养创造型人才为目标的创新精神教育是素质教育的核心，应成为教育的重中之重。本从培养学生的创造意识、创造精神、创造能力入手，探讨在体校化学教学中开展创新精神教育的基本思路。     

水厂加药系统改造与应用

加药系统是水处理工艺过程中的重要环节，其投加的准确性、可靠性直接影响到出厂水质、制水成本。因此如何结合水厂实际对加药系统进行有针对性的改造，是具有重要意义的。     

Gel time of calcium acrylate grouting material

INTRODUCTION One of the main advantages of chemical groutsis easy control of gel time (Mollamahmutoglu andLittlejohn, 1996; ?nupárek and Soucek, 2000).Calcium acrylate is a chemical grout usually used ingeotechnical engineering (Zelanko and Karfakis,1997), and is a water-soluble monomer that po-lymerizes in an aqueous solution. The rate of po-lymerization is controlled by the concentration ofcatalyst and activator. The polymerization of cal-cium acrylate is free radical chain pol…     

美国《化学文摘》的发展变化历程(上) --美国《化学文摘》创刊95周年评述

美国《化学文摘》 (“ChemicalAbstracts” ,CA)自 190 7年创刊至 2 0 0 1年已经走过了 95个年头 ,若以人的年龄段称呼而论 ,CA已经接近“期颐”之岁了。然而 ,由于世界科学技术 ,特别是高新技术在近一二十年内日新月异的发展 ,科技源文献的数量随之与日俱增 ,这就不断地给CA补足新的活力。加之CA编辑出版者———美国化学学会 (ACS)下属的化学文摘社 (CAS)的精心而科学的管理经营 ,并不断应用新技术新方法 ,使得 95岁高龄的CA在新旧世纪交替之际不但没有丝毫的“衰老”迹象 ,反而更加朝气蓬勃 ,预示着在新世纪还将继续蒸蒸日上。95…     

Teaching Chemical Equilibrium with the Jigsaw Technique

This study investigates the effect of cooperative learning (jigsaw) versus individual learning methods on students’ understanding of chemical equilibrium in a first-year general chemistry course. This study was carried out in two different classes in the department of primary science education during the 2005–2006 academic year. One of the classes was randomly assigned as the non-jigsaw group (control) and other as the jigsaw group (cooperative). Students participating in the jigsaw group were divided into four “home groups” since the topic chemical equilibrium is divided into four subtopics (Modules A, B, C and D). Each of these home groups contained four students. The groups were as follows: (1) Home Group A (HGA), representing the equilibrium state and quantitative aspects of equilibrium (Module A), (2) Home Group B (HGB), representing the equilibrium constant and relationships involving equilibrium constants (Module B), (3) Home Group C (HGC), representing Altering Equilibrium Conditions: Le Chatelier’s principle (Module C), and (4) Home Group D (HGD), representing calculations with equilibrium constants (Module D). The home groups then broke apart, like pieces of a jigsaw puzzle, and the students moved into jigsaw groups consisting of members from the other home groups who were assigned the same portion of the material. The jigsaw groups were then in charge of teaching their specific subtopic to the rest of the students in their learning group. The main data collection tool was a Chemical Equilibrium Achievement Test (CEAT), which was applied to both the jigsaw and non-jigsaw groups The results indicated that the jigsaw group was more successful than the non-jigsaw group (individual learning method).     

高校基础化学实验考核模式的探讨

提出了高校基础化学实验考核的综合模式，探讨了考核评价的客观性、全面性、可操作性，以期提高实验考核的信度、效度。     

Technological outsourcing and product diversification: do markets for technology affect firms’ strategies?

This paper analyses how the existence of competitive technology markets affects firms’ technology sourcing decisions, and their propensity to enter into new product markets. While the division of innovative labour has received increasing attention within the economic literature, this paper focuses on its managerial implications. By means of a specialised database, we assess how patterns of technology trade influence firms’ technology and diversification strategies in the chemical industry. We find that, the larger the market for technology, the stronger the advantages to substitute internal R&D with outsourcing, and to increase the degree of product diversification.     

STS与化学教学

STS教育是近年来世界各国科学教育改革运动中形成的一股思潮。在化学教学中加强STS教育，对提高学生学习兴趣，发展学生的自学能力和思维能力，提高学生的科学素养和文化素质都具有深远的意义。