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利用化学教学设计评价量表(CTDES),对广州市某高校86名化学师范生在教育实习期间完成的教学设计进行评价,发现师范生在“认知与元认知”“社会文化与情感”“科学描述与应用”指标表现中等,在“一致性”指标表现较好。师范生在对“理论化学”和“描述化学”类课题进行教学设计时,在“认知与元认知”“社会文化与情感”“科学描述与应用”3个指标上的得分存在显著差异。 相似文献
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基于《中学教育专业师范生教师职业能力标准》提炼了师范生教育教学能力体系,体系涵盖了师德践行能力、实践教学能力、综合育人能力和专业发展能力等4项能力及对应的10方面能力要素。以化学教学论课程为例,分析了其章节内容与4项能力的对应关系,探讨了课程实施中化学师范生教育教学能力形成的机理和途径。化学师范生4项能力的形成机理各有特点,需要师范生和教师积极互动。 相似文献
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利用“理科师范生使用课程材料情况问卷”,对广州市某高校167名理科师范生在教育实习期间使用课程材料的形态进行调查,发现理科师范生在各维度均表现出较好的课程材料使用形态,但未达到很高的水平。不同专业师范生的课程材料使用形态在“科学探究”“STSE”和“教师学习”维度存在显著差异;不同实习学校类型师范生的课程材料使用形态在“STSE”维度存在显著差异;不同实习年级师范生的课程材料使用形态不存在显著差异;有无家教经验师范生的课程材料使用形态在“科学探究”“STSE”和“教师学习”维度存在显著差异。文章最后提出理科师范教育的建议。 相似文献
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运用化学自我概念问卷,对高一学生化学学科自我概念和化学学业成绩之间的关系进行探讨,结果表明:学生化学学科自我概念达到中等水平,化学学业自信较高,化学学业自我调控较弱;学生化学学科自我概念水平在性别上无显著差异;父母职业背景对学生化学自我概念有较大的影响;学生化学成绩与化学学科自我概念得分之间具有一致性,学生化学成绩对化学学科概念的形成有显著的影响. 相似文献
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选取人教版高中教材《化学1》中10个实验,对北京市6所中学的364名高一学生进行调查研究,结果表明:学生对化学实验的理解水平总体不高;关联结构均值显著低于单一/多元结构和拓展抽象结构;3个维度之间呈显著正相关;学生对无机非金属元素一章的实验的理解水平较低;对溶液配制实验和金属钠的相关实验的理解水平较高。男生和女生在化学实验理解程度上没有显著性差异。基于调查结果提出实验教学建议。 相似文献
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北京师范大学化学学院对化学专业公费师范生的培养目标是面向全国各级各类中学培养卓越化学教师,并将"社会实践与志愿服务"作为公费师范生的实践课程之一。学生开展暑期支教项目,是参加社会实践与志愿服务的一种常见形式。本文以北京师范大学化学学院"化育英才"暑期支教队为例,证明通过重视暑期支教指导教师的指导作用,保障学生实践时间和质量,将学生自身成长与服务社会相统一,将实践内容与开设的其他课程相互补,在实践中体现知识的应用与学习相统一,不仅能使暑期支教项目成为化学专业公费师范生的实践类金课,而且能为化学专业公费师范生未来教师职业发展打下一定的基础。 相似文献
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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. 相似文献
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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. 相似文献
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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. 相似文献
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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. 相似文献
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微量钙的测定方法研究进展 总被引:5,自引:0,他引:5
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)。 相似文献
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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. 相似文献