高师化学教育实习资源库开发与思考

结合师范生教育实习面临的问题,介绍了开发高师化学专业教育实习资源库的方法和经验,探讨了资源库在师范生教学技能训练、教育实习中的必要性和重要作用。     

化学教育专业师范生课堂教学技能的渗透式培养

针对化学教育专业师范生课堂教学技能的培养途径单一、课时有限等问题,提出了在化学教育专业选修课程中渗透式培养的观点。通过理论分析和实践探索,发现在某些化学教育专业的选修课程中渗透师范技能的培养,不仅能提升师范生课堂教学技能的培养效果,而且提高了相关选修课的教学质量。     

化学专业师范生实践性知识水平及影响因素调查研究*

基于自主建构的化学师范生实践性知识水平研究模型,采用自编调查问卷,对河北某高校化学专业271名师范生进行问卷调查,运用SPSS 13.0数据统计分析软件进行数据处理,研究结论如下:(1)化学专业师范生在经过系统的理论学习之后,在实习之前,其实践性知识整体和各维度均处于本研究的中等水平;(2)化学专业师范生实践性知识的5个维度之间具有较强的相关性,各维度在一定程度上相互影响、相互制约;(3)教学经验的积累、大学之前的学习经历、自己敬重和喜欢的老师、优质课的观摩、教学案例分析、微格教学技能训练是影响化学专业师范生实践性知识的主要因素。     

教师资格认证下师范生教育实践能力培养模式探索

以学科教学知识(pedagogical content knowledge, PCK)为基础, 通过立体化核心课程群和"观摩—见习—研习—实训—实习"五阶段一体化实践教学体系构建, 引入教师职业资格标准, 师范生将已有的化学学科专业知识、技能和教育科学知识运用于中学化学教育、教学和研究工作;建立可观察、可测量、可操作的科学的成长档案袋, 达到系统全面地提升师范生教育实践能力的目的, 实现教育实践能力培养模式的创新探索。     

化学师范生微格教学导入技能LICC课堂观察评价表的建构和应用

课堂观察模式是近年研究出的一种听评课范式。从学生学习(L)、教师教学(I)、课程性质(C)、课堂文化(C)4个维度构建导入技能LICC课堂观察评价表,将其运用于2010级、2011级化学师范生进行导入技能教学评价。通过统计,分析出师范生训练导入技能过程中存在的问题,针对师范生教学给出了相应的教学建议,以达到提高师范生教学技能的目的。     

师范生顶岗实习对中学化学教学影响的调查

师范生顶岗实习是高等师范院校教育教学改革的重要举措,对促进师范生成长起着重要作用。通过对中学领导、教师、学生与师范生在教育顶岗实习过程中出现的各种情况进行调查,分析当前教育顶岗实习的实施对师生化学教学产生的影响,针对存在的问题,提出相应的建议。     

维吾尔族化学师范生课堂教学技能现状调查与对策研究

师范生教学技能的培养是教师专业成长中极其重要的一部分。用师范生教学评价量表对维吾尔族化学师范生课堂教学进行观察,并通过SPSS软件进行统计、分析,得出化学师范生教学技能主要存在的问题,并分析其缘由,进而提出相应的对策。     

免费师范生教师教育实践新模式研究——西部生源地教育创新实验区

免费师范生培养是我国改革师范教育的一项新举措,旨在鼓励更多的优秀青年从事基础教育教师职业,提高我国基础教育的质量。在师范生培养的各项工作中,教育实习是一个重要的环节。本文就北京师范大学免费师范生教师教育实践新模式中的“西部生源地教育创新实验区“展开讨论。论证了该新模式的必要性及创新性,由此指出免费师范生的培养模式多样化的重要性。     

加强化学多媒体CAI研究与实践探索信息时代化学教育实习的新模式

化学多媒体CAI技能是新世纪化学教师职业技能的重要组成部分;教育实习是高师生化学多媒体CAI技能培训的重要途径。围绕教育实习训练和提高高师生化学多媒体CAI技能,是一个很有现实意义的课题。     

线上线下化学教育实习模式探索

为了提高化学教育实习的质量，根据我校化学教育实习实际情况，探索出线上线下化学教育实习模式。线上和线下化学教育实习有机结合，在强化实习生教学基本功锻炼的同时，注重专业知识的学习和专业技能的规范化，以及改进实习成绩的考核和评定，从而有效地提高了化学师范生的教学实践能力和创新能力，我院化学教育实习实现进一步规范化、稳定化，并可为其他专业教育实习提供有价值的参考。     

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%.     

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.     

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.     

A general and convenient synthesis of 4-(tosylmethyl)semicarbazones and their use in amidoalkylation of hydrogen,heteroatom, and carbon nucleophiles

A general synthesis of previously unknown semicarbazone-based α-amidoalkylating reagents, 4-(tosylmethyl)semicarbazones, has been developed. The synthesis involved three-component condensation of semicarbazones of aliphatic or aromatic aldehydes with the same or other aldehydes and p-toluenesulfinic acid. The scope and limitations of this reaction were investigated. The compounds obtained were demonstrated to be an efficient α-(4-semicarbazono)alkylating agents. They were reacted with H- (sodium borohydride), O- (sodium methylate), S- (sodium phenylthiolate), N- (pyrrolidine, sodium succinimide), P- (trialkyl phosphites), and C-nucleophiles (sodium diethyl malonate) to give the corresponding products of the tosyl group substitution, 4-substituted semicarbazones, including analogues of nitrofurazone. Among the prepared compounds tested in vitro for antibacterial and antifungal activity, three nitrofuryl-containing semicarbazones exhibited high biological activities with minimum inhibitory concentration (MIC) values of 8–32 μg/mL.     

Synthesis of novel chiral bidentate hydroxyalkyl-N-heterocyclic carbene ligands and their application in palladium-catalyzed Mizoroki–Heck couplings and asymmetric addition of diethylzinc to benzaldehyde

A small library of new chiral bidentate hydroxyalkyl-imidazolium salts 1 is conveniently synthesized on multi-gram scale from inexpensive and commercially available chiral pool amino acids. The corresponding carbenes, generated by deprotonation of imidazolium salts 1, in combination with palladium(II) chloride were tested in the Mizoroki–Heck coupling reaction. The most significant results in terms of yields and reactivities were achieved with low catalyst loading. The catalytic activities of these imidazolium salts were also investigated in the asymmetric addition of diethylzinc to benzaldehyde. The use of MgO nanoparticles as an additive in conjunction with these ligands played a crucial role in increasing the efficiency of these reactions.