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针对应用化学专业实践性环节中存在的问题,围绕应用型人才培养,采取项目调研、企业定岗顶岗实习、产品研发等形式,加强学生创新能力,提高学生的就业竞争力。 相似文献
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顶岗实习是高职院校专业教学过程中重要的实践性教学环节,是提高毕业生综合职业能力和素质的必经阶段。但顶岗实习在实施过程中存在管理不规范、不科学等问题,影响了教学效果。结合我院应用化工技术专业顶岗实习运行情况,对高职院校校企共管的"334"顶岗实习教学模式进行了探索。 相似文献
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聚乙烯吡啶树脂吸附乳酸的研究 总被引:2,自引:0,他引:2
本文系统地研究了乳酸在聚乙烯毗啶(PVP)树脂上的吸附和解吸特性。测定了乳酸在PVP树脂上的吸附动力学曲线和吸附等温线,研究了温度、无机盐浓度及液相pH值等因素对乳酸在PVP树脂上的吸附特性的影响。用动态实验比较了不同有机溶剂的洗脱性能。选择甲醇作解吸剂,考察了乳酸进液浓度、流速、床层的初始状态等因素对乳酸在PVP树脂柱中的动态吸附及解吸特性的影响,并对动态吸附过程进行了数学模拟。 相似文献
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Nabel A. Negm Ahmed F. M. El-Farargy Essam A. Abdel Halim Sayed El-lboudy Abd El-Shafey I. Ahmed 《Journal of surfactants and detergents》2014,17(6):1203-1211
Four nonionic surfactants were prepared from the reaction of propylene oxide with oleic acid, linoleic acid, and the free fatty acid mixture from hydrolysis of jatropha oil. The chemical structures of the prepared surfactants were confirmed using IR and NMR spectroscopy. The surface activities of the prepared surfactants were dependent on the polypropylene oxide chain length and also on the nature of the alkyl chains. The nonionic surfactants were evaluated at different concentrations as corrosion inhibitors against the corrosion of Al 6061 aluminum in 2 M HCl solution. The corrosion inhibition tendencies of the surfactants were completely dependent on the fatty acid ratio in the jatropha oil and also on the polypropylene oxide chain length. The corrosion inhibition efficiencies of the surfactants were correlated to their chemical structure and their surface activities. 相似文献
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民用工业中复合材料桁架的应用和发展 总被引:1,自引:0,他引:1
本文叙述了复合材料桁架的构造、分类和计算方法,突出了复合材料桁架的优越性能和在民用工业中的应用前景;在分析大量文献资料的基础上阐述复合材料桁架杆件的多种加工工艺,并比较不同截面形式对杆件性能的影响;探讨复合材料杆件的破坏机理和分析方法,介绍节点的类型和各自的特点,提出节点及连接部位存在的关键问题;根据国内外复合材料桁架的研究和应用现状,阐述了复合材料桁架的性能和不同的设计方法,总结归纳影响复合材料桁架性能的关键因素和设计中存在的一些问题,并提出改进杆件设计、节点设计和优化复合材料桁架的建议。 相似文献
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Yuji Tatemoto Yoshiyuki Bando Keiji Yasuda Yoshitaka Senda Masaaki Nakamura 《Drying Technology》2001,19(7):1305-1318
The drying characteristics of porous material in fluidized bed were examined theoretically and experimentally. The brick ball was used as the sample and immersed in the fluidized bed. The glass beads were used as the fluidizing particles and the particle diameters were changed. When the pore diameter of sample was relatively large, the fluidizing particles were adhered on the sample surface. In the theoretical analysis, the heat and mass transfers in adhered particle layer were considered. The fluidizing particles were adhered on the sample surface during the earlier period of drying. The sample temperature largely decreased when the mass of adhered particle decreased. The calculated results are in good agreement with experimental data. The diameter of fluidizing particle had a small effect on the drying time. The excess increments in drying gas temperature hardly contributed to shortening the drying time. 相似文献
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采用计算流体动力学(CFD)方法,运用流体体积(VOF)模型研究生物转盘表面液膜流动特性,分析了传统实心转盘和新型开窗转盘表面液膜的成膜特性、厚度和速率等,并考察了不同转盘厚度对成膜和液膜厚度的影响。结果表明:实心转盘的液膜自上而下平缓过渡,而开窗转盘中,开窗区域附近出现液膜位置的急剧变化,并在槽内液体下方发现很多不规则的气泡;转盘在上升区的液膜厚度随角度的增加快速减小,而下降区的液膜厚度基本不变,趋于稳定;转盘开窗形成的自由膜速率大,更新频率快;在研究范围内,不同厚度转盘形成的液膜随转盘厚度增加,开窗区域的自由膜厚度增加。 相似文献
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电纺丝制备纳米纤维综述 总被引:1,自引:0,他引:1
综述了电纺丝在制备纳米纤维方面的发展和研究状况,详细介绍了电纺丝工作原理和部分关键设备,并总结了影响电纺纤维性能的因素和电纺丝的重要应用领域以及发展前景。 相似文献