“化学游戏教学”的“学教评产”混合式教学模式实践

基于师范类专业认证理念与毕业要求的教学前端分析,建构“学教评产”混合式教学模式,通过整合教学内容、重构教学安排与优化教学评价,对“化学游戏教学”课程进行创新性改革,并从学生学习成果、教学目标达成与学生满意度等3个方面评价教学成效。结果表明:该教学模式有助于学生学习成果质量的提升,能够有效促进教学目标的达成,并取得较高的学生满意度。     

基于雨课堂+企业微信+慕课的在线直播教学——以有机化学为例

主要介绍了基于雨课堂和企业微信双平台直播教学,以及同步慕课课程为辅的有机化学在线教学实践,并以教学实例展示了“学生为中心,教师为引导”的“疑探”式教学体系。该在线直播教学还融入以弹幕、微信群和小组作业为主的交互方式,注重学生与学生、学生与教师以及学生与教学资源的互动;通过构建多维度的考核体系,加强对学习过程的考核,提高学生学习的主动性和参与度。     

略论化学教学过程中创设多种信息通道

教学过程中的优化,取决于认知信息的产生、组合,取决于信息道的畅通和信息传输与接受过程的稳定平衡。本文主要就信息道的畅通谈一点看法。     

雨课堂与腾讯课堂联用的“有机化学”线上教学设计与实践*

基于智慧教学工具“雨课堂”为主和“腾讯课堂”为辅的双平台联用组合,将“雨课堂”优秀的教学互动和全周期记录学习活动表现的功能与“腾讯课堂”网络直播高峰期画面卡顿少、师生可以语音互动的优点结合起来,充分发挥“以学生为中心”的教学理念,探讨了有机化学课程的线上教学设计,并在教学班级中进行了广泛实践。实践证明,“雨课堂”直播为主和“腾讯课堂”为辅的双平台联用教学模式能保证教学质量、激发学生的学习兴趣和提高学生的学习效果。     

有机化学实验课上的细节教学——以合成乙酰苯胺为例

以合成乙酰苯胺为例说明细节教学对于有机化学实验取得预期效果的重要性。首先将学生分组,采用不同的方法进行教学,然后将学生的实验结果进行对比分析;结果表明细节教学与学生实验的正确操作直接相关。归纳、解析了学生在乙酰苯胺合成实验中的常见问题,并对教师教学时应强调和指导的要点提出了建议。     

“互联网+”时代下雨课堂在现代仪器分析课程教学中的实践与探索*

从课前预习、课上教学与管理和课后分析与总结等方面探讨了雨课堂在现代仪器分析课程教学中的实践探索。教学实践表明,采用基于“互联网+”的雨课堂混合式教学模式,学生的学习能力提高,教师的教学水平提高,课程评价模式提升。学生问卷调查结果表明,95%以上的学生认可雨课堂教学。同时,分析了目前雨课堂在实施过程中遇到的问题,并提出改进意见。旨在为高校进一步推进基于“互联网+”的雨课堂混合式教学模式提供参考。     

“一体三翼”教学模式在工科无机化学教学中的应用与实践*

为适应当前复合型人才培养需求和提高学生自主学习能力和创新意识,在对大学一年级新生进行无机化学教学时需坚持以学生为主体的教学理念,并努力同时提高他们的思想政治素质、理论联系实际能力和科学研究素养。为此,提出“一体三翼”教学模式。然而,大多数工科院校无机化学课程的授课学时有所压缩,这对任课教师来讲是一种巨大挑战。通过“线上-线下”混合式教学解决学时不足问题,并通过学生课程参与度、学生学习成绩及教学反思等形式检验“一体三翼”教学模式的教学实践成效。     

分析化学课程群建设探索

分析化学系列课程教学团队不断改进和探索新的教育教学模式。在课程教学中,实行线上线下混合+双语的教学模式,并将该学科中所蕴含的思政元素与课程内容相互渗透;依托MOOC和虚拟仿真教学项目开展分析化学实验课程教学,在提升学生专业知识水平和训练综合能力的基础上,厚植爱国情怀,并培养学生严谨求实的科学态度。     

仪器分析测试技术信息化教学探索与实践

针对高职学生的特点，以仪器分析测试技术课程实训教学为例，按照课前布置学习任务，学生翻转课堂学习，"教、学、做"一体化课堂教学，课后复习巩固的形式，开展信息化教学的探索与实践，并对信息化教学的效果和存在的问题进行了分析。通过信息化教学改革，仪器分析测试技术课程突破了传统教学时空的限制，激发了学生学习的兴趣，构建了"学生主体、教师主导"的教学新模式，提高了课堂教学效果，对推动高职课堂信息化教学的改革具有一定的借鉴意义。     

混合式教学法在分析化学教学中的设计与实践*——以“碘量法”为例

针对中医药类专业中分析化学课堂以教为主、师生互动少、教学效果较差等问题,借鉴“线上线下(O2O)”混合教学模式,利用清华在线网络平台、雨课堂和中国MOOC等网络资源开展课程建设,并对分析化学课堂教学进行改革,重构教学理念和教学流程,“翻转”师生角色,将线上与线下教学有机统一,借助线上的网络学习资源、测试平台等帮助学生在时间和空间上自由学习,达到学生个性化、差异化学习的目的。     

非那雄胺合成工艺改进

非那雄胺能抑制5α-还原酶的活性,明显降低二氢睾酮水平,是一种治疗良性前列腺增生的有效药品。该合成工艺以甾烯酮酸为原料,将其与氯化亚砜反应,无须分离即与叔丁胺反应得17β-酰胺化合物,再氧化开环,环合,氢化,脱氢合成了非那雄胺。经元素分析、IR、1HNMR、13CNMR、MS分析表征了其结构。该法无须使用昂贵的2,2-二吡啶二硫化物和剧毒药品苯亚硒酸酐,且以乙酸铵代替氨气,降低了对设备的要求和腐蚀,更适用于工业生产。     

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.     

Acid hydrolysis of carboxymethylcellulose of low degree of substitution

Cotton cellulose was swollen in a sodium hydroxide solution and carboxymethylated by a two-bath method for different periods of time for each process. The kinetics of acid hydrolysis and the crystallinity of the swollen and carboxymethylated samples were measured. The proportion of broken bonds, rate constants for hydrolysis, and permeability of cellulose to hydrolyzing agents were calculated. The susceptibility of glycosidic linkages to acid hydrolysis was improved by carboxymethylation more than by swelling in alkali. The increased accessibility of carboxymethylcellulose to acid was regarded as a consequence of increased intra-and intercrystalline swelling and of the glycosidic bonds' weakness caused by the electron-attracting carboxymethyl group on the C-6 position.     

Estimation of Kinetic Parameters of Thermal Oxidation of Ilmenite

The aim of the presented work was the investigation of thermal oxidation of ilmenite in static air atmosphere. The investigations were carried out by use of a derivatograph (MOM, Hungary). The changes of crystallographic structure of investigated samples were identified by X-ray diffractometry on Philips PW-1710 diffractometer. In temperature above 500°C appears structure of hematite Fe₂O₃. On the basis of the thermogravimetric measurements, the contracting area and contracting volume models were found as the best fitting experimental data. This revised version was published online in August 2006 with corrections to the Cover Date.     

Mechanism of action of base-catalyzed oxygenation of phenol derivatives

Cyclopropyl derivative of 2,6-di-tert-butylphenol is synthesized as a probe to investigate the mechanism of base-catalyzed autooxidation of phenol derivatives. Our study indicates that one electron reduction of molecular oxygen from phenolate gives phenoxyl radical 3, a key intermediate of autooxidation. The coupling of phenoxyl radical and superoxide radical gives peroxylate anion 4 and produces the final epoxy alcohol adduct 6.     

氯氧化镁生成热的研究

用氧化镁氯化镁水溶液制备了8水合氯氧化镁[nMg(OH)2·MgCl2·8H2O], 并测定了其在盐酸中的溶解热, 实验结果表明, 氯氧化镁溶解热与n值呈线性关系, 根据溶解热求出5Mg(OH)2·MgCl2·8H2O和3Mg(OH)2·MgCl2·8H2O的生成热分别为-7727.1和5888.1kJ·mol^1^-。     

化学计量中不确定度评定研究进展

测量不确定度是表征合理地赋予被测量之值的分散性的参数。本文针对化学计量不确定度评定基础模型仅适用于线性模型、概率分布为正态分布或缩放位移t分布等局限,介绍了近年来不确定度评定的研究热点:蒙特卡罗方法(Monte Carlo Method,MCM),不确定度评定的来源、评定概念、评估方法及其发展过程,扩大了测量不确定度评定与表示的适用范围。     

微量钙的测定方法研究进展

介绍了1995-2006年期间测定微量和痕量钙的方法,如电感耦合等离子体-原子发射光谱法、原子吸收光谱法以及离子色谱法等的工作原理和特点,并说明了其测定微量钙的应用领域。并对微量钙的测定技术进行了展望(引用文献55篇)。     

Stages of thermal decomposition of sodium oxo-salts of sulphur

Thermal behaviour of sodium oxo-salts of sulphur: Na₂SO₄, Na₂S₂O₇, Na₂S₂O₆, Na₂SO₃, Na₂S₂O₅, Na₂S₂O₄, Na₂S₂O₃, Na₂S₃O₆ and of sulphides Na₂S and Na₂S₂ was studied on heating up to 1000°C. The experiments were performed with anhydrous compounds obtained from commercial products by recrystallisation and dehydration. The stage mechanisms of decomposition of anionic sub-lattices of the salts have been proposed basing on the Górski’s morphological classification of simple species. The thermal stability and the stage decomposition mechanisms were correlated with the structure and the potential chemical properties of the salt anions. The thermal decomposition processes were studied by means of thermal analysis, and the decomposition products were identified by means of X-ray phase analysis.     

Synthesis of phenolic components of Grains of Paradise

Two vanilloids, (5E)-8-(4-hydroxy-3-methoxyphenyl)oct-5-en-4-one (1) and 4-[3-hydroxydecyl]-2-methoxyphenol (2), isolated from the dried seeds of Grains of Paradise (Aframomum melegueta), were synthesized; the latter compound was made as the S-enantiomer and the material derived from the seeds was found to be a 1:1.7 mixture of the R and S isomers. The synthetic route used should allow the preparation of analogs having extended alkyl chains and consequently different lipophilicity, and 3, a homolog of 2, was also prepared.