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以高职有机化学课程为例,探讨了抛锚式翻转课堂教学模式的构建和实践。主要包括:课前微课视频的制作、课堂组织、课后拓展、辅导和教学评价等环节。抛锚式教学模式和翻转课堂的结合,可以调动学生学习的主动性和积极性,使学生成为课程学习的主体,有利于有机化学课程的教学,有利于培养更多更好的新时代药学专业技术技能人才。 相似文献
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针对我校有机化学实验课程传统教学模式中存在的弊端,探索了激励机制辅助的"翻转课堂"教学模式,并以正溴丁烷的制备实验为例,介绍了课前、课中以及课后的教师和学生工作内容以及教学评价。实践表明:激励机制辅助的"翻转课堂"教学模式,极大地调动了学生自主学习的积极性和主动性,且激励机制可以更有效地保证"翻转课堂"的顺利实施。 相似文献
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通过翻转课堂与传统课堂在学习目标与教学流程上的对比,详细阐述了"原电池"翻转课堂的教学设计特点与实践研究过程,即课前利用微视频和学习单自主学习形成基本概念,课堂上通过解决问题实现重要概念内化,课后通过开放性问题体验原电池的价值。实践结果显示,"原电池"翻转课堂教学设计与实践能够更好地促进学生的发展,并在一定程度上优于传统课堂教学。 相似文献
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基于3种类型的翻转课堂——任务导向型翻转课堂、展示型翻转课堂和项目驱动式翻转课堂在国际高中化学课程中的实践过程,探讨了如何在把握以学生为中心的翻转课堂本质的基础上,通过融入任务导向或项目驱动进一步发挥教师的专业引导作用,强化课前和课内连接而成的有机整体,将学生个性化自主学习的效率最大化,并最终引导学生成长为有后续学习能... 相似文献
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溶解度作为一项重要的物化指标,一直是化学学科的研究重点。然而,通过实验测量获得数据耗时费力,因此,科研人员建立了多种理论方法来进行估算,其中,人工神经网络因其能够关联复杂的多变量情况而受到广泛关注。本文综述了人工神经网络在物质溶解度预测方面的应用,介绍了应用最广泛的3种神经网络(BP神经网络、小波神经网络、径向基神经网络)的模型结构、预测方法和预测优势,探讨了神经网络的不足以及改进方法。文章最后对神经网络在物质溶解度预测方面的发展前景进行了展望。与其他方法相比,人工神经网络技术在物质溶解度预测方面具有预测结果精确度高、操作简单等特点,具有广阔的应用前景,但输入变量选择、隐含层节点数确定、避免局部最优等问题还需逐步建立系统的理论指导。 相似文献
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用链长分布不同的活性聚苯乙烯子聚物与二乙烯基苯进行阴离子嵌段共聚,合成了一系列两相模型交联网络。以作者等提出的方法测定了所合成网络的结构非均一因子Z。实验测定的网络结构非均一因子Z与交联前聚苯乙烯活性链的分子量分布宽度指数d之间有平行的相应变化规律,表明所给予的非均一因子Z的物理意义是合理的。同时说明,子聚物链长分布较宽时,在网络的高交联区中除了二乙烯基苯外,还有一些对溶胀无贡献的子聚物以悬挂链的形式存在。 相似文献
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Geraldo Magela E Silva Paulo Hora Acioli Antonio Carlos Pedroza 《Journal of computational chemistry》1997,18(11):1407-1414
The electronic correlation energy of diatomic molecules and heavy atoms is estimated using a back propagation neural network approach. The supervised learning is accomplished using known exact results of the electronic correlation energy. The recall rate, that is, the performance of the net in recognizing the training set, is about 96%. The correctness of values given to the test set and prediction rate is at the 90% level. We generate tables for the electronic correlation energy of several diatomic molecules and all the neutral atoms up to radon (Rn). © 1997 by John Wiley & Sons, Inc. J Comput Chem 18 : 1407–1414, 1997 相似文献
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L. Matjka K. Duek P. Chabanne J. P. Pascault 《Journal of polymer science. Part A, Polymer chemistry》1997,35(4):651-663
Network formation in cationic polymerization of polyepoxides was treated using a combination of kinetic theory and the statistical theory of branching processes (TBP). The complex reaction mechanism involved a degradative termination reaction affecting the molecular weight distribution of the primary chains. Moreover, formation of low-molecular-weight products, initiation, two mechanisms of propagation and transfer were taken into account. © 1997 John Wiley & Sons, Inc. J Polym Sci A: Polym Chem 35: 651–663, 1997 相似文献
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Karel Dusˇek 《Macromolecular Symposia》2007,256(1):18-27
Summary: The basis of the statistical method of generation of branched and crosslinked structures as a Markov process is analyzed with special emphasis on the effect of differences in reactivities of functional groups. For irreversible reactions, it is important that the transition probabilities are calculated kinetically and that bonds once formed are not allowed to be reformed. The statistical methods are often a good approximation of real situation even if not all approximations used in the model are fulfilled. Cyclization is still a serious problem in modeling; For practical application it is recommended to rescale calculated ring-free dependences against the experimental gel point. 相似文献
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采用毛细管电泳法测定了46个健康人和26个乳腺癌病人尿样中的13种正常核苷和修饰核苷,以小波神经网络作为模式识别工具对健康人和乳腺癌病人的分类作了研究,随机选取的训练集的识别率达到100%,相应的预测集判别率正确性在96%以上,与经典的前向多层神经网络相比,小波神经网络具有更强的信息提取和逼近能力.研究结果还表明,小波神经网络的预测能力强于主成分分析和线性判别分析,毛细管电泳法与小波神经网络的结合有望成为乳腺癌的辅助诊断手段. 相似文献
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Many intermolecular chemical interactions persist across length and timescales and can be considered to form a “network” or “graph.” Obvious examples include the hydrogen bond networks formed by polar solvents such as water or alcohols. In fact, there are many similarities between intermolecular chemical networks like those formed by hydrogen bonding and the complex and distributed networks found in computer science. Contemporary network analyses are able to dissect the complex local and global changes that occur within the network over multiple time and length scales. This work discusses the ChemNetworks software, whose purpose is to process Cartesian coordinates of chemical systems into a network/graph formalism and apply topological network analyses that include network neighborhood, the determination of geodesic paths, the degree census, direct structural searches, and the distribution of defect states of network. These properties can help to understand the network patterns and organization that may influence physical properties and chemical reactivity. The focus of ChemNetworks is to quantitatively describe intermolecular chemical networks of entire systems at both the local and global levels and as a function of time. The code is highly general, capable of converting a wide variety of systems into a chemical network formalism, including complex solutions, liquid interfaces, or even self‐assemblies. © 2013 Wiley Periodicals, Inc. 相似文献
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超分子三维氢键网络:{[Cu(phen)3](SO4)(H3PCA)2(8H2O)}的晶体结构 总被引:5,自引:0,他引:5
A new complex, {[Cu(phen)3](SO4)(H3PCA)2(8H2O)}, was synthesized and structurally characterized by single-crystal X-ray analysis. The complex is composed of copper cations, sulfate anions, 1,10-phenanthroline, protocatechuic acid and lattice water molecules. The structure of H3PCA, SO42- and waters comprises packing of anionic three-dimensional network by hydrogen bonds with cavities. The complex can be considered as a model of host/guest supramolecule. The three-dimensional hydrogen-bonding network is the host species. The Cu(phen)32+ cations, guest species, occupied the cavities of the host. And the results demonstrate that the form of protocatechuic acid at pH< 1 should be free ligand. CCDC: 191733. 相似文献
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Hongbo Lu Yutian Chu Shuaicheng Jing Guobing Zhang Juntao Hu Guoqiang Lv 《Liquid crystals》2017,44(3):437-443
In reverse-mode polymer-stabilised cholesteric texture (PSCT), the dynamic response is derived from local director reorientation governed by dielectric coupling effect/self-assembly and polymer network deformation. A double exponential rise/decay model is proposed to investigate the underlying physical mechanisms. Through simulation of the transient rise and decay processes, the polymer network deformation in PSCT can be quantitatively evaluated. Less deformation and faster restoration speed of the polymer network can suppress hysteresis. These results provide useful guidelines for future PSCT fabrication and performance optimisation. 相似文献