基于3C-FIAS的优秀化学教师课堂教学语言分析——以“从铝土矿到铝合金”为例

以2位优秀化学教师（称为A、B）的课堂教学"从铝土矿到铝合金"为研究对象,采用3C-FIAS方法对课堂教学语言进行编码,比较分析概括优秀化学教师进行元素化合物知识教学的语言特征和可能存在的不足之处,为构建高效的化学课堂提供有效意见和建议。     

化学优质课3C-FIAS常模的建立研究

以全国优质课评比的90节化学课为常模样本,建立化学优质课3C-FIAS教学行为变量常模,并验证了常模的适用性、科学性和实用性。此外,根据弗兰德斯特殊序对,建立了3C-FIAS特殊序对常模。     

专家型中学化学教师课堂教学个案研究——基于弗兰德斯互动分析系统

通过弗兰德斯互动分析系统(FIAS),对甘肃省临夏中学专家型教师L的课堂教学进行量化处理,进而分析课堂中师生互动情况,评价、总结出该教师的课堂教学特征:关注学生现场生成性问题,表扬学生优点与引导学生思维时机得当。从而为新手型化学教师通过教学实践来促进个人专业发展提供依据。     

FIAS互动分析系统的改进及在中学化学课堂分析中的应用

结合新课程中学化学教学实际情况,对FIAS教学分析系统进行了改进.并结合课例,介绍了改进后的编码系统,编码记录方法和数据的处理,矩阵的建立,以及在课堂分析中的应用.为化学课堂教学提供了客观、细致的一种评价方法.     

“沉淀-溶解平衡概念应用”课堂教学中专家与新手教师语言行为的比较研究

采用课堂观察和弗兰德斯互动分析系统(FIAS),对新课程背景下"沉淀-溶解平衡的概念应用"教学中新手与专家教师的课堂教学语言行为进行了比较研究.结果发现新手和专家教师在课堂语言结构、教师倾向或风格、教师与学生情感气氛和课堂教学语言行为的组合等方面都存在较大差异.针对专家和新手教师语言行为的特征和差异,对新手教师语言行为的改进提出了建议.     

基于FIAS的化学课堂师生言语行为个案研究

教师和学生的言语互动是教学活动最主要的方式,从某种意义上说,把握了课堂教学中师生言语行为也就把握了课堂教学的实质。本文以弗兰德斯互动分析系统（Flanders Interaction Analysis System,简称FIAS）为工具,对一节化学课的师生言语互动行为从课堂情感气氛、课堂结构、教师风格和提问的创新程度4个方面进行了定量分析,为课堂教学行为的实证研究提供了一种方法。     

以学论教化学课堂教学评价量表及其构建

以学论教是基础教育课程改革提出的新的课堂教学评价观。依据以学论教的内涵和特点,以“学生学的行为”、“教师教的行为”、“教学内容”和“教学目标实现”4方面围绕过程、内容、结果3个学习纬度,通过课堂教学评价实践的应用完善,构建了以学论教化学课堂教学评价量表;围绕量表的使用,介绍了该评价量表指标及其观测点的特点及评价注意点。     

化学理论课堂教学结构模型构建初探——基于课堂教学视频案例分析的研究

模块化结构的我国中学化学课程标准和新教材,需要寻求教学规律与课堂教学的组成、结构模型来支持课程目标的实施,将课堂教学视频案例研究作为新的研究方法,成为关注的热点。研究采用了课堂教学视频案例采集和教学结构维度的分析方法,选取了6个优秀化学理论课堂教学视频案例,应用“Videograph”视频分析软件从学生学习行为、教师教学行为和师生互动3个主要维度对案例进行分析、解读与比较。对教师课堂导入、新内容讲授（区分为教师启发式讲授和教师直接知识讲授）、师生课堂探究（区分为教师演示实验探究和学生自主探究）、师生课堂探究讨论（区分为学生小组探究讨论、师生互动问答讨论）、课堂练习、课堂小结、其他活动等7个部分进行了编码分析和特征解读。初步提出了化学理论课堂教学结构的时间模型。     

男女化学教师课堂教学基元系统有效性的比较研究

基于教学行为视角,依据课堂教学系统CPUP模型理论和课堂教学基元系统有效性评价量表,通过对24位男女化学教师的24节常态课堂中基元系统有效性进行对比分析。结果发现,男女教师的主要差别表现为:在"时间利用的合理性"和"匹配度"2个维度上,女教师显著高于男教师;在"教学行为链实施质量" 和"资源和技术的使用质量"2个维度上,男教师显著高于女教师;而在总分和"基元内容的合理性"维度上,2者不存在显著差异。     

化学课堂教学目标探析

制定化学课堂教学目标是教师进行教学设计的重要环节.本文结合中学化学教学实际,对化学课堂教学目标的含义、分类、功能以及化学课堂教学目标的确定和陈述做了较系统的阐述和分析,明确提出制定课堂教学目标是化学教师的教学基本功之一.     

α-Amino acid derived enaminones and their application in the synthesis of N-protected methyl 5-substituted-4-hydroxypyrrole-3-carboxylates and other heterocycles

A new and simple synthesis of novel N-protected methyl 5-substituted-4-hydroxypyrrole-3-carboxylates, which exist in equilibrium with their 4-oxo tautomers, has been developed in two steps starting from N-protected α-amino acids. The key intermediates are enaminones, which can also be isolated, characterized, and used for the construction of other functionalized heterocycles, before they spontaneously decompose to pyrrole products. 4-Hydroxypyrroles are prone to partial aerial oxidation but can be efficiently alkylated or reduced to stable polysubstituted pyrrolidine derivatives.     

Specific intramolecular aromatic CH insertion of diazosulfonamides

The chemoselectivity in the intramolecular CH insertion of various diazosulfonamides has been experimentally studied. The results reveal that the aliphatic 1,4-, 1,5-, or 1,6-C(sp³)?H insertions of diazosulfonamides are not accessible, while the aromatic 1,5-C(sp²)?H insertion can be realized specifically by adjusting the diazo-adjacent group. In addition, the general chemoselectivities in the intramolecular CH insertions of diazosulfonyl compounds are summarized. Generally, diazosulfones undergo both aromatic 1,5-C(sp²)?H and aliphatic 1,5- and 1,6-C(sp³)?H insertions, while diazosulfonates undergo aliphatic 1,5- and 1,6-C(sp³)?H insertions. However, diazosulfonamides only undergo aromatic 1,5-C(sp²)?H insertion.     

N-Heterocyclic carbene-palladacyclic complexes: synthesis,characterization and their applications in the C-N coupling and α-arylation of ketones using aryl chlorides

N-Heterocyclic carbene-palladacyclic complexes 3 were successfully achieved in a one-pot procedure under mild conditions. The structure of 3a was unambiguously confirmed by X-ray single crystal diffraction and it was an active catalyst in the Buchwald-Hartwig amination and α-arylation of ketones even at very low catalyst loadings (0.01?mol%).     

Iodine-mediated oxidative Pictet-Spengler reaction using terminal alkyne as the 2-oxoaldehyde surrogate for the synthesis of 1-aroyl-β-carbolines and fused-nitrogen heterocycles

An efficient iodine-mediated oxidative Pictet-Spengler reaction in dimethyl sulphoxide (DMSO) using terminal alkynes as the 2-oxoaldehyde surrogate for the synthesis of aryl (9H-pyrido[3,4-b]indol-1-yl)methanones is described. The scope of the protocol includes the total synthesis of Fascaplysin, Eudistomins Y₁ and Y₂. The methodology is extended for preparing pyrrolo[1,2-a]-quinoxaline and indolo[1,5-a]quinoxaline derivatives. The utility of 1-aroyl-β-carbolines was demonstrated by performing palladium-catalyzed β-carboline directed ortho-C(sp2)-H functionalization of the phenyl ring with thiomethyl (SMe) group using DMSO as source and for accessing 4-aryl-canthin-6-ones.     

Facile synthesis of bicyclic 1-arylpyrazol-5-ones

In this Letter, we described a facile method for constructing fused bicyclic 1-arylpyrazol-5-one ring system. We employed various methylene-containing carboxylic acids as the substrates and proved that the pyrazolone ring closure requires activated methylene group in intermediate II. Accordingly, a series of structurally diversified, fused bicyclic 1-arylpyrazol-5-ones was prepared in moderate to high yields using the requisite substrates.     

A carbanion induced synthesis of highly congested pyrazole and imidazole containing heterocycles

An efficient approach to the synthesis of highly congested di, penta and hexacyclic pyrazoles as well as imidazole fragment containing novel heterocyclic molecule has been developed through a carbanion induced transformation of suitably functionalized 2H-pyran-2-ones, benzo[h]chromene and thiochromeno[4,3-b]pyrans. Due to the presence of fluorescence, we report their prime application metal sensor as off/on switching in ferric ions.     

Synthesis of pyrrolo[1,2-a]pyrazines and pyrazino[1,2-a]indoles by Curtius reaction in Morita-Baylis-Hillman derivatives

Synthesis of substituted pyrrolo[1,2-a]pyrazines and pyrazino[1,2-a]indoles from the Morita-Baylis-Hillman derivatives of acrylates via saponification followed by Curtius reaction is described.     

正丁胺对激光染料荧光谱影响的研究

用正丁胺作为碳源,采用射频辉光放电制备碳膜,选用激光染料R6G和聚乙二醇混合液作为蒸气源,采用单源热蒸发,在蒸发室与染料同时沉积得到混合膜,用拉曼光谱和红外光谱分析了碳膜的结构和键合方式,分析表明:碳膜中存在胺基团和氢原子.混合膜的荧光谱测量结果表明,认为正丁胺对染料荧光谱的影响是因为胺基和氢原子的存在.     

Selective synthesis of 4,5-dihydroimidazo- and imidazo[1,5-a]quinoxalines via modified Pictet–Spengler reaction

An efficient tandem approach for the selective synthesis of 4,5-dihydroimidazo[1,5-a]quinoxalines 6a–g and imidazo[1,5-a]quinoxalines 7a–h by the reaction of 2-imidazolyl anilines 4a–c with aryl aldehydes 5a–k under mild reaction conditions is described. Introduction of electron releasing alkyl groups in substrates 4a–b was found to be instrumental for the success of the reaction.     

Understanding the Diels-Alder reactivity of 1,2-azaborine analogues

The Diels-Alder reactivity of 1,2-heteroborines (H₄C₄B(H)X, X?=?NH, PH, AsH; O, S, Se) has been computationally explored by means of Density Functional Theory (DFT) calculations. The influence of the HB?=?X fragment on the reactivity of the system has been quantitatively analyzed in detail by means of the so-called Activation Strain Model (ASM) of reactivity. It is found that the interaction between these species and the dienophile is significantly stronger than that computed for their all-carbon isoelectronic counterpart, benzene. In addition, the strain energy plays a key role in the observed reactivity trends. The role of the aromaticity strength of these heteroarenes on the reactivity is also assessed.