初中起点的幼师培养中化学课堂有效教学策略

根据初中起点幼师化学教学中存在的学生文化基础较差、学习习惯差、学习积极性差等问题,依据从教多年的教学实践,在前人研究的基础上,从解决学生的思想认识问题、创设和谐有序的课堂教学秩序、针对性地改进教学等3个方面,提出了在幼师化学课堂教学中进行有效教学的策略。     

“进入合成有机高分子化合物的时代”单元整体设计与教学实践

选取聚乙烯醇滴眼液和维纶纤维为教学素材,对"进入合成高分子化合物的时代"一章进行了全新的单元整体设计和教学实践。按照高分子化学、高分子物理和高分子工程3个专业体系对教学内容进行了整合,创设情境、提出问题,使学生在思考、讨论和实验中获取新知,认识到高分子科学与工程的一般性研究方法,以及高分子化合物组成、结构、性质和用途间的关系。     

应用交互仿真性课件提高课堂教学效率的尝试

论述了提高课堂教学效率的重要性以及实际课堂教学中存在的不足和局限,提出了一种新型课件(交互仿真性教学课件)用以解决上述问题,并用"实验室里制取CO2的研究与实践"案例诠释该类课件在优化课堂教学过程、提高课堂教学效率中的具体应用。     

"知识为线一方法为纲":基于化学基本原理的探究教学新探

课堂中有关化学基本原理的内容通常不易开展探究教学.在"化学反应速率影响因素的探究"课题的教学设计与实践过程中,采用"知识为线-方法为纲"的设计思路,以化学反应速率影响因素的相关知识为线索承载科学探究方法,将课堂中探究教学的焦点从化学知识延伸至科学方法,较好地凸显了科学探究方法教育.在此基础上,进一步挖掘科学探究方法的化...     

基础化学“三级实验教学”模式的研究与实践

本文在探讨原基础化学实验课程体系的局限性和拟定其改革思路、指导思想的基础上,配合以物理化学为先导的化学课程新体系,提出了基础化学实验的"三级教学"模式,并具体进行了教学实践,取得了初步的成效.     

日本高中新课程"科学与人类生活"和"理科课题研究"概览

日本在2009年公布的"高中学习指导要领"中取消了设置近40年的理科基础和理科综合(A,B)课程,新设了"科学与人类生活"及"理科课题研究"新课程.分析介绍这2门新课程的设置背景、设置理念、课程性质、课程目标及内容构成情况.     

走向教学实践的教师培训——北京市"绿色耕耘"行动京郊化学教师培训的实践与反思

教师培训应该走向教学实践,关注和研讨课堂教学问题,引导教师走上专业发展之路.结合"绿色耕耘"行动——北京市远郊区县农村义务教育学校化学骨干教师培训的实际,介绍了教师培训的目标定位、培训课程内容的设置以及培训活动方式等方面的思考与实践,对培训过程中积累的经验进行了反思,对扎根于教学实践的教师培训发表了看法.     

"爱护水资源"说课

写在前面:说课,作为我国基础教育教研实践中产生的一种研讨形式,已经走过了二十多年的发展历程.二十多年来,说课始终与我国中小学教学实践紧密联系,广泛地运用于各式各样的教研活动当中,发挥着特有的功能,体现出显著的成效.     

多媒体课件因子对化学教学的影响分析——以"溶液的渗透压"教学为例

以"溶液的渗透压"为例,通过比较多媒体教学与传统教学,找出多媒体课件因子对学生学习的影响.结果表明:学生对多媒体课件有较强的情感;适当的课件动画、教学速度控制、教师的引导等对教学有良好的促进作用;以多媒体课件进行化学计算的教学,教学效果不如传统教学;多媒体课件可以促进学生对操作的"认知一定向"阶段的提高,但是不能替代实...     

基于Parsel理念的初中化学教学实践与反思*——以“二氧化碳的性质和用途”为例

基于Parsel理念,以二氧化碳为载体,正确定位教学目标,改变教学环节,转变教学策略,创设贴近生活的情境,重视评价反馈,引导学生在情境感知、问题解决和探究实践中有效提升科学素养。研究发现,基于Parsel理念的初中化学教学实践应关注3个方面:应创设贴近生活的情境吸引学生;以高质量的问题引发思考;以多样化的活动助推探究实践。     

Neutral diterpenoids of oleoresins of five species of conifers of Transcarpathia

The compositions of the neutral diterpenoids of the oleoresins of five species of conifers growing in the Transcarpathia have been studied. It has been found that the oleoresins ofAbies alba M.,Larix decidua M., andPicea excelsa L. contain more than 50% of neutral diterpenoids. The group and qualitative compositions of the oxygen-containing diterpenoids have been determined. In the oleoresins ofAbies alba,Picea excelsa, andPicea abies tertiary alcohols — cis-abienol and isocembrol — predominate, while inLarix decidua the main component is the hydroxy ester larixyl acetate. Primary alcohols related to the resin acids have been found in all the oleoresins investigated. Features of the distribution of diterpenoids according to the species of conifers have been revealed. The results obtained are necessary for the chemotaxonomy of conifers of the family Pinceae.Novosibirsk Institute of Organic Chemistry, Siberian Branch, Academy of Sciences of the USSR. Translated from Khimiya Prirodynkh Soedinenii, No. 6, pp. 812–816, November–December, 1988.     

利用手持技术改进测定乙醇分子结构实验

利用压强传感器代替排水集气法,改进测定乙醇分子结构实验的仪器装置,并探索最佳反应条件。另外,设计两个空白实验,结合压强变化曲线对实验误差进行相关讨论。     

光谱仪测试范围的扩展

由于石化行业的生产需要，其材质的使用具有多样性和广泛性，经常会出现顾客委托的测试样品的一个或几个元素跨越光谱仪现有测试程序测量范围的情况。本法通过对光谱仪测试原理的认识，根据光谱仪的测试能力及标样的采集，实现了一个或几个元素测量范围的扩展，并对其测量的影响因素进行了研究。     

Effect of the Method of Modification of Zeolite X on Selectivity of Catalytic Methylation of Toluene

Theoretical and Experimental Chemistry - The effect of the method of modification of catalysts based on zeolite X by cesium and magnesium cations (ion exchange and impregnation) on the selectivity...     

Dichroism of absorption and polarization of phosphorescence of molecules of the closed form of nitrobenzospirothiopyran

The spectral-polarization characteristics of absorption and phosphorescence of molecules of the initial form of nitro-substituted indolinospirobenzothiopyran were studied in oriented polyethylene films and in solutions with different polarity. An oscillator model of the electron transitions responsible for the formation of absorption and luminescence spectra was suggested. It was established that the principal differences in the spectral and photophysical properties of the compound studied and its oxygen-containing analog are associated with the fact that the electronegativity of the S atom is lower than that of the O atom. Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 6, pp. 1143–1146, June, 1997.     

Influence of viscosity of medium on processes of oxygen quenching of excited states of mesoporphyrin

The oxygen quenching rate constants for singlet and triplet excited states of the dimethyl ester of mesoporphyrin IX increase with decreasing viscosity of the medium and reach a maximum at a viscosity of approximately 0.4 mPa·sec, after which the rate constants begin to decrease. The drop in rate constant with increasing fluidity of the medium may be related to a nonequilibrium character of the elementary act in the interaction of the reactants in the solvent cage. In viscous media such as isopropyl alcohol, isobutyl alcohol, and isoamyl alcohol, the reaction radius is greater than the sum of the radii of the reacting particles. The long-range character of these processes is due to the relatively weak dependence of the quenching probability on distance.Translated from Teoreticheskaya i Éksperimental'naya Khimiya, Vol. 25, No. 2, pp. 161–167, March–April, 1989.     

Synthesis of tetrabenzoporphins of the basis of isoindoline

Chemistry of Heterocyclic Compounds -