云教学在化学师范生数字化实验课中的应用研究*

结合本校化学教学论实验的教学现状,融合云教学及翻转课堂理念对教学进行重构,设计并实施以“蓝墨云班课”云平台为师生互动桥梁的翻转课堂云教学。以中学化学数字化实验教学为例,让化学师范生以“学习者”和“未来教师”的双重角色体验翻转课堂云教学的学习过程,并利用SERVQUAL模型评价法对云教学进行数据分析、反馈完善。通过进一步问卷分析,了解到学生不仅熟练地掌握了所学知识内容,而且对翻转课堂模式与实施细节有了更为深刻的理解,最后对翻转课堂云教学及师范生教学提出了几点建议。     

慕课时代翻转课堂在药物化学教学中的应用

针对药物化学课程的自身特点, 就如何开展翻转课堂进行了思考, 包括制作教学视频、课堂组织、课后辅导和教学评价等诸多环节。慕课和翻转课堂的结合, 调动了学生的学习主动性和积极性, 使学生成为教学主体, 有利于药物化学课程的教学和培养适合大药学背景下的药学人才。     

翻转课堂教学模式在普通化学教学中的应用与评价

首次探讨了在普通化学民族班教学中应用"翻转课堂"的教学模式,并就教学效果进行了评估。翻转课堂教学模式充分调动了民族班学生的学习积极性和主动性,同时提高了教师的教学水平,取得了较好的教学效果。为在对母语为非汉语的学生开设的普通化学课程教学中逐步采用"翻转课堂"教学模式替代传统教学模式提供了成功的经验。     

“实验化学”翻转课堂教学案例设计

针对实验化学课程的特点,探讨了实验化学“课前知识传递,课堂知识内化,课后反思提高”的翻转课堂教学设计。以“硫酸亚铁铵的制备”为实验案例,通过翻转课堂在学习目标、活动主体与教学流程上的教学设计,详细阐述了以学生为中心的教学实施,并全面评价了教学实践。     

高师院校"化学教学论"课程中实施论辩教学的研究与实践

论辩教学是一种能够调动学生学习主动性、提升教学效果的教学模式,针对当前高师院校"化学教学论"课程实施过程中教师讲授为主,缺乏学生课堂参与的现状,从课前准备、课堂论辩、课后反思和评价三方面精心设计并实施了论辩教学。基于对学生书面论辩修改稿和学生期末考试作答情况的分析,可以认为实施论辩教学对于提高"化学教学论"课程的教学效果,提升化学专业师范生对化学教育理论问题的认识和理解能力有重要价值。     

翻转课堂在医学院校卫生化学实验教学中的应用

将翻转课堂教学模式引入到预防医学专业卫生化学实验课中,以“高效液相色谱法测定饮料中的山梨酸与苯甲酸”为例分析翻转课堂设计过程,包括任务单设计、教学视频制作、课堂组织、课后评价等诸多环节。实践表明,翻转课堂的应用,激发了非化学专业学生对卫生化学实验的学习兴趣,调动了学习主动性和积极性,使学生由被动接受者变为主动探究者,而教师则由知识传授者转变为学习促进者和指导者,有利于培养学生自主学习能力和创新合作精神。     

基于翻转课堂教学模式下的化学教学实践研究——以高中化学“原电池”为例

以"原电池"一节的教学设计与实施为例,从教学内容的选择、微视频及课前学案的制作、课前学案的分析与反馈、课堂教学的实施等4个方面探索翻转课堂模式在化学教学中的应用。提出翻转课堂这种教学模式在基于学情组织教学和培养学生高阶思维能力方面的优势以及面对这一新的教学模式教师和学生所要面临的挑战。     

高师“化学教学论”课堂教学改革与实践

"化学教学论"是高师院校化学教育专业中最能体现师范性,与基础教育化学教育教学联系最为紧密的一门专业必修课程,但没有得到师范生应有的重视。为此,内蒙古师范大学的"化学教学论"课程从教学内容、教学模式及教学评价3个方面进行了课堂教学改革,并取得了一定的成效,既促进了学生的学习积极性和课堂参与度,又训练并提高了学生的课堂教学技能。     

基于“对分课堂”的高师院校化学教学论教学改革

对分课堂"的主要环节包括讲授、自学和讨论，这种模式能有效结合课堂讲授和讨论教学的优势，提高学生的学习积极性、学习能力和创新意识。基于化学教学论的教学现状和特点，采用"对分课堂"具有现实性和可操作性，改革思路为：精心整合、优选教学内容；改革评价制度，注重过程性评价；打造交互式学习平台，实施"亮考帮"；提升教师的教育信息技术能力。根据对分课堂的理念和模式，以"说课"为例探讨化学教学论教案的设计。     

物理化学教学模式的探索与实践

在当今高等教育创新人才培养要求下,结合国内外教育先进技术方法,通过物理化学教学实践,探索了讲授课堂、翻转课堂、对分课堂等3种教学模式,教学实效性结果表明,开放式的教学更利于提高教学质量,对分课堂教学模式更适合于我校学生学习物理化学。     

二氧化碳和丙烯直接合成甲基丙烯酸的NiPMo/TiO2催化剂的研究

用溶胶-凝胶法以磷钼酸(MPA)的镍盐溶液水解钛酸四丁酯制备了NiPMo/TiO2催化剂.使用ICP、 XRD、 TG-DTA、 IR、 TPD-MS和微反应技术研究了催化剂的化学组成、热稳定性、化学吸附性质和催化反应性能.杂多钼酸盐与TiO2通过O2-在TiO2表面发生了键合.在623 K下,杂多阴离子仍保持原有的Keggin结构.CO2在Lewis酸位Ni(Ⅱ)和Lewis碱位Ni-O-Mo的桥氧协同作用下生成CO2卧式吸附态Ni(Ⅱ)←O-(CO)←(O--Ni).丙烯有多种吸附态在催化剂上吸附.在563 K、 1 MPa和空速1500 h-1的反应条件下,丙烯的摩尔转化率为3.2%,产物MAA选择性为95%.     

Toward new camptothecins. Part 6: Synthesis of crucial ketones and their use in Friedländer reaction

In the context of the preparation of camptothecin and luotonin A analogs, the synthesis of some key keto-precursors and their use in Friedländer condensation are described. This paper also focuses on the stability of these keto intermediates and emphasizes the major differences between indolizinones and pyrroloquinazolinones series. Noteworthy is also the report of some original structures isolated as by-products of some experiments.     

CoFe2O4自形成磁性液体场致结构化对磁化的影响

The Langevin paramagnetic theory can’t describe the relation between magnetization of ferrofluids and applied magnetic field. The structuralization of ferrofluids, which is considered the main influence factor of the magnetization, is regarded. The part of magnetization works is deposited when the structure is forming. This action influences the magnetization of ferrofluids directly or indirectly. On the base of the “compressing” model, the Langevin function that usually describes the magnetization of ferrofluid is modified, and a well-fitted curve is obtained. An equation of the relation between the equivalent volume fraction after being “compressed” and the intensity of magnetic field is discovered, which approximately describes the process of magnetization. The relation between the approximate initial susceptibility and the volume fraction can be obtained from modified formula.     

Highly regioselective Buchwald–Hartwig amination at C-2 of 2,4-dichloropyridine enabling a novel approach to 2,4-bisanilinopyridine (BAPyd) libraries

The highly regioselective Buchwald–Hartwig amination at C-2 of the cheap and readily accessible reagent, 2,4-dichloropyridine with a range of anilines and heterocyclic amines is described. This new methodology is robust and provides a facile access to 4-chloro-N-phenylpyridin-2-amines on 0.25 mol scale. These intermediates undergo a further Buchwald–Hartwig amination at higher temperature to enable rapid exploration of the chemical space at C-4 and to provide a library of 2,4-bisaminopyridines.     

KMnO4-mediated oxidative CN bond cleavage of tertiary amines: Synthesis of amides and sulfonamides

KMnO₄-mediated oxidative CN bond cleavage of tertiary amines producing secondary amine was introduced, which was trapped by electrophiles (acyl chloride and sulfonyl chloride) to form amides and sulfonamides. The reaction could take place at mild condition, tolerating a wide range of function groups and affording products in moderate to excellent yields.     

Chemistry of heterocyclic compounds at the A. E. Favorsky Irkutsk Institute of Chemistry, Siberian Branch of the Russian Academy of Sciences, over 50 years (Review)

The review contains a concise historical account and information on the most significant researches undertaken by the staff at the A. E. Favorsky Irkutsk Institute of Chemistry, Siberian Branch of the Russian Academy of Sciences on the Chemistry of Heterocyclic Compounds. Dedicated to Academician of the Russian Academy of Sciences B. A. Trofimov on his 70th jubilee. Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 10, pp. 1443–1502, October, 2008.     

Sulfur-directed metal-free and regiospecific methyl C(sp3)–H imidation of thioanisoles

Regiospecific and direct imidation of the methyl C(sp³)–H bond of thioanisoles is realized under mild and metal-free conditions with N-fluorobis(benzenesulfonyl)imide as an oxidant and nitrogen source. Proposed mechanism suggests that thionium ion intermediates and a Pummerer-type reaction are involved. The imidation has advantages such as high step-economy, excellent functionality tolerance, and regiospecificity, giving structurally diverse imidation products.     

Selective syntheses of 2H-1,3-oxazines and 1H-pyrrol-3(2H)-ones via temperature-dependent Rh(II)-carbenoid-mediated 2H-azirine-ring expansion

The Rh(II)-catalyzed reaction of 2-carbonyl-substituted 2H-azirines with ethyl 2-cyano-2-diazoacetate or 2-diazo-3,3,3-trifluoropropionate provides an easy access to 2H-1,3-oxazines and 1H-pyrrol-3(2H)-ones. These compounds can be selectively prepared from the same starting material using temperature as the only varied parameter. The 2-azabuta-1,3-diene intermediate, a common precursor for both heterocyclic products, isomerizes into 2H-1,3-oxazine under kinetic control, while 1H-pyrrol-3(2H)-one is the sole product of the reaction at elevated temperatures. According to DFT-calculations a one-atom oxazine ring contraction involving ring-opening to a 2-azabuta-1,3-diene intermediate, followed by a 1,5- and 1,2-prototropic shift leads to the consecutive formation of imidoylketene and azomethine ylide, which then further undergo cyclization to the pyrrole derivative.     

Synthesis of 1-benzyloxypyrazin-2(1H)-one derivatives

Different approaches for the synthesis of 1-benzyloxypyrazin-2(1H)-one derivatives from simple amino acids have been investigated. A library of 33 precursors for the preparation of N-hydroxy pyrazinones was obtained in moderate to good yields.