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刘国鹏 《山东教育学院学报》2013,28(3)
本文介绍了一种制备中空微胶囊的新方法-Pickering乳液模板法.阐述了这种方法的基本设计思想;详细介绍了在微胶囊制备过程中固定囊壁的方法.关于Pickering乳液模板法制备中空微胶囊,本文展望了未来有意义的研究方向及潜在的应用价值. 相似文献
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A cold-model vertical multi-tube circulating fluidized bed evaporator was designed and built to conduct a visualization study on the pressure drop of a liquid-solid two-phase flow and the corresponding particle distribution.Water and polyformaldehyde particle (POM) were used as the liquid and solid phases,respectively.The effects of operating parameters such as the amount of added particles,circulating flow rate,and particle size were systematically investigated.The results showed that the addition of the particles increased the pressure drop in the vertical tube bundle.The maximum pressure drop ratios were18.65%,21.15%,18.00%,and 21.15%within the experimental range of the amount of added particles for POM1,POM2,POM3,and POM4,respectively.The pressure drop ratio basically decreased with the increase in the circulating flow rate but fluctuated with the increase in the amount of added particles and particle size.The difference in pressure drop ratio decreased with the increase in the circulating flow rate.As the amount of added particles increased,the difference in pressure drop ratio fluctuated at low circulating flow rate but basically decreased at high circulating flow rate.The pressure drop in the vertical tube bundle accounted for about 70%of the overall pressure drop in the up-flow heating chamber and was the main component of the overall pressure within the experimental range.Three-dimensional phase diagrams were established to display the variation ranges of the pressure drop and pressure drop ratio in the vertical tube bundle corresponding to the operating parameters.The research results can provide some reference for the application of the fluidized bed heat transfer technology in the industry. 相似文献
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Even though there is no common conceptual basis guiding teacher education in Canada, over the past two decades teacher educators both in Canada and around the world have called for teacher candidates to become agents of change. While researchers across Canada strive to demonstrate how to prepare pre- and in-service teachers to be agents of change, few scholars have examined in detail what teacher agency might mean in the Canadian context. This paper reviews the conceptualisation of agency from five theoretical perspectives (psychology, sociology, critical theory, historical studies, and post-structuralism) and examines how empirical studies in the Canadian contexts align with these perspectives. This paper makes explicit the connections between the how and the what of agency, and as such informs current approaches to preparing pre- and in-service teachers and their potential role as agents of change, and maps out how the notion of agency is taken up in a particular jurisdiction. 相似文献
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纸筒作为一种轻质材料,具有绿色环保、运输方便等优点,在临建结构中具有良好的应用前景。该文通过力学试验,研究了在受压和受拉荷载下不同几何参数对纸筒构件关键力学性能的影响;明确了纸筒构件的抗压、抗拉破坏形态,给出了极限强度及峰值应变的数值区间;通过建立有限元模型,对试验进行了补充验证,进一步明确纸筒构件的受力机理,并分析了参数对纸筒构件关键力学性能的影响;最后提出一种可实现绿色生产的空间桁架纸筒结构,这种结构应用了3D节点打印技术。研究结果可为纸筒结构的实际应用提供数据支持。 相似文献
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健康中国是实现我国国民健康长寿、国家富强、民族振兴的重要发展战略,全民阅读是促进国人精神发育和提高民族精神境界的战略举措。文章将健康中国战略与全民阅读理念相结合,提出了健康阅读推广方案,将健康阅读推广分为生理健康推广、心理健康推广和行为健康推广,以期培养出具有理想信念、传统美德和人文精神的社会主义建设者和接班人,推动阅读型健康中国的建设进程。 相似文献
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李国朋 《河南科技学院学报》2013,(1):130-132
知识管理关键技术是知识管理的基础和重要推手。文章从分析图书馆资源和服务入手,着重研究知识管理关键技术在图书馆资源建设、用户服务和形象宣传中的重要作用。指出利用知识管理关键技术对提高图书馆知识管理水平和用户服务的能力,对建设资源型、服务型图书馆具有重要作用。 相似文献
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人工智能在近几年快速发展并成为最热门的技术之一,如能快速了解人工智能技术热点与发展态势,对抢抓人工智能发展的重大战略机遇与构筑先发优势具有重要意义。本文提出了一种基于专利可视化图谱发现技术热点的方法,即在连续时间窗口上绘制图谱,在此基础上运用密度分布变化来识别该领域技术热点。为了提升专利图谱的准确性,本文使用海量专利文本训练了基于深度学习的doc2vec模型,形成了专利文本特征抽取模型。经过实验对比发现该模型在测试数据集中表现远超经典的词袋模型与主题模型。在实例分析中使用了2012—2019年10457件三方人工智能专利进行热点发现,共发现研究热点7个,并对7个热点中关键概念词、专利申请人所属国家进行深入分析。 相似文献