共查询到19条相似文献,搜索用时 78 毫秒
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运用中学生化学学业成败归因量表和学业自我效能感量表,抽取653名城乡中学生进行测查,对测查数据进行分析得出以下结论:中学生化学学业成败倾向于外部归因;城乡之间中学生化学学业成败归因、学业自我效能感存在显著差异;学业成败归因和学习行为自我效能感通过学习能力自我效能感这一中介变量影响学生的化学学业成绩。 相似文献
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依据学业自我概念的理论, 借鉴国内有关学业自我概念量表, 编制出中学生化学学业自我概念量表。对量表统计分析后显示: 中学生化学学业自我概念包括4个因素, 即化学学业自信、化学学业能力自我认知、化学学业自我体验和化学学业自我调控。量表具有较好的信度和效度, 能较好地反映中学生化学学业自我概念的状况。 相似文献
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通过文献分析,开放式问卷调查和个别访谈,编制了化学演示实验课堂中非言语性教学技能的评价问卷。特殊性探索因素分析中的分层面个别因素分析将非言语性教学技能限定为板书技能、信息技术运用技能、教态变化技能、课堂管理组织技能、解题技能、课堂观察技能、演示实验技能等7个维度;验证性因素分析支持非言语性教学技能评价问卷结构;所编问卷具有较好的信度和效度,可以作为化学教师非言语性教学技能的有效测量工具。 相似文献
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通过自编的学生化学学习归因特点的量表对某民办中学高一学生进行了调查,得出如下结论:整体上学生对于化学考试和化学问题解决的成功和失败归因无性别差异,均主要归因于努力、基础、运气、教师和他人帮助等因素。但学生的成功归因在普通班与重点班中存在明显差异,普通班比重点班的学生更多地倾向于运气。在性别上,重点班中男生更倾向于将考试的成功归因于努力和能力,女生倾向于努力和教师;而普通班则无性别差异。 相似文献
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以方便采样的方法随机抽取210名队员问卷调查、10名指挥员访谈,介绍化学品运输船泄漏事故应急救援培训现状及需求,进行问题归因,为科学组织培训提供对策建议。调查结果采用SPSS 24.0软件和Excel 2016软件进行统计分析,结果显示:目前培训以本单位内部集中培训为主,以知识和技能居多;后续培训需求内容上侧重能力提升、理念更新,时间上以20~40学时为主,形式上以业务研讨、参观见习等为主,方法上以操作示范、结对经验传授、模拟岗位实践为主;目前主要存在认识不足、理念滞后、激励和考核机制不全等问题;制约因素有活动设计、场地设备、质效评估、参与意识等。建议积极引导参与培训、科学确定目标、提高培训内容的匹配度、建立激励机制,提高培训质效。 相似文献
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Christophe Len Serge Pilard Claude Vaccher Yana Shrinska Claude Rabiller 《Tetrahedron》2005,61(44):10583-10595
An efficient route, starting from 2-bromobenzaldehyde, is described to synthesize racemic diastereoisomeric thymine derivatives of isochroman, which are aromatic analogues of Stavudine, an approved anti-HIV drug. The relative configurations were determined by NOE proton NMR experiments in connection with molecular modeling. Following the separation of the latter diastereoisomers, kinetic resolution was achieved via a transesterification reaction catalyzed by lipases. Using this method, moderate ee's were obtained (0.74-0.98). Thus, an alternative strategy starting from d-mannitol was proposed to provide pure enantiomers. The attribution of absolute configurations was made by chemical filiation on the basis of the configurations obtained from d-mannitol. The structural attributions were confirmed by studying the behavior of proton NMR shifts of the corresponding isochroman Mosher's esters. 相似文献
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介绍一个结合4种教学策略(情境教学、探究性学习、合作学习、混合式教学)面向非化学专业类大一学生开展元素化学教学的案例。以垃圾分类为主题,学生分组协作完成探究性学习任务,调查不同种类垃圾中存在的化学元素及其用途,通过线下课堂展示、线上成果共享以及校外推广等3项活动传播探究结论。对比活动前后收集的数据,活动前有75%的学生只认识原子序数前20的化学元素,活动后学生认识的元素数量明显增多,平均值是原来的1.7倍。元素中文名称与元素符号记忆混乱的情况得到改善。最后问卷调查表明活动提高了学生上课的积极性并且对了解生活中的化学元素有帮助。 相似文献
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RNA secondary structure prediction is a key technology in RNA bioinformatics. Most algorithms for RNA secondary structure prediction use probabilistic models, in which the model parameters are trained with reliable RNA secondary structures. Because of the difficulty of determining RNA secondary structures by experimental procedures, such as NMR or X-ray crystal structural analyses, there are still many RNA sequences that could be useful for training whose secondary structures have not been experimentally determined. In this paper, we introduce a novel semi-supervised learning approach for training parameters in a probabilistic model of RNA secondary structures in which we employ not only RNA sequences with annotated secondary structures but also ones with unknown secondary structures. Our model is based on a hybrid of generative (stochastic context-free grammars) and discriminative models (conditional random fields) that has been successfully applied to natural language processing. Computational experiments indicate that the accuracy of secondary structure prediction is improved by incorporating RNA sequences with unknown secondary structures into training. To our knowledge, this is the first study of a semi-supervised learning approach for RNA secondary structure prediction. This technique will be useful when the number of reliable structures is limited. 相似文献