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反渗透膜的污染与清洗 总被引:3,自引:0,他引:3
对反渗透膜的污染原因、污垢种类及其危害进行了综述,准确判断膜清洗时机,针对不同的膜材质和不同类型的污垢,选用恰当的清洗剂,采用合理的清洗工艺,清除各类污垢,快速恢复膜通量。 相似文献
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《中国洗涤用品工业》2017,(11)
本文讨论了机车的清洗问题,分析了车体外板和窗玻璃污垢的组成,以及各种清洗剂对车辆材料、密封材料的影响。最后,筛选出了性能最好的车辆清洗剂,并验证了该清洗剂的实际清洗效果。 相似文献
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对反渗透膜的污染原因、污垢种类及其危害进行了综述。准确判断膜清洗时机 ,针对不同的膜材质和不同类型的污垢 ,选用恰当的清洗剂 ,采用合理的清洗工艺 ,清除各类污垢 ,快速恢复膜通量 相似文献
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该厂采用化工部化工机械研究院缓蚀技术研究所开发的化学清洗剂和清洗技术,清除尿素一段分解加热器管内污垢,取得显著的效果。本文对清洗方法及清洗过程作了详细介绍。 相似文献
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宋代景德镇青白瓷具有"白如玉、明如镜、薄如纸、声如磬"的特点,而宋代的政治方针、哲学思想、宗教思想、文人审美和书画意趣等多方面的综合影响,正是形成宋代景德镇青白瓷审美风格的深层次原因。 相似文献
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教学相长既是教学理念,又是教学方法,它是古人对教学和认知的一种哲学思想。通过目前对教学相长认识现状的分析,结合课程教学,构建了课程教学中的教学相长模型。该模型包含5种形式的教学相长模式,囊括了目前人们对教学相长的所有认识。通过具体的教学实践,阐述了5种教学相长模式的具体应用,证明了这5种模式在课程教学中的有效性,为教学相长在新时期的应用提供了实践和理论依据。 相似文献
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室温离子液体(ionic liquids, ILs)作为一种新型的绿色环保溶剂,由于其特殊的功能化结构及热稳定性好、挥发度低和溶解能力强等特点,目前被广泛应用于纳米材料的制备领域。本文重点介绍了离子液体在纳米材料制备中的应用及相关研究的最新进展,结合一些示例对本领域进行了概述,其中包括离子液体作为溶剂,例如作为反应介质和稳定剂;模板剂,例如利用离子液体的微结构(胶束和囊泡、液晶凝胶、乳液和微乳液)作为纳米材料合成中的模板和软模板;反应物,例如作为反应中的还原剂和反应组分;以及离子液体微乳液在纳米材料制备中的特殊用法进行了总结,并讨论了离子液体在快速发展的纳米材料制备领域中的存在挑战和机遇。 相似文献
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《应用陶瓷进展》2013,112(4):204-209
Porous mullite ceramics were prepared at 1300–1600°C for 2?h via a foam-gelcasting route using industrial-grade mullite powders as the main raw material, Isobam 104 as the dispersing and gelling agent, triethanolamine lauryl sulphate as the foaming agent and sodium carboxymethyl cellulose as the foam stabilising agent. The effects of firing temperature on the sintering behaviour of green samples as well as microstructures and properties of final porous mullite products were investigated. With increasing the temperature from 1300 to 1600°C, linear shrinkage and bulk density values of fired samples increased, whereas their porosity decreased. Mechanical strength and thermal conductivity values of fired samples decreased with increasing their porosities. Even at a porosity level as high as 79.4%, compressive and flexural strengths of fired samples (with average pore size of 314?μm) remained as high as 9.0 and 3.7?MPa, respectively, and their thermal conductivity (at 200°C) remained as low as 0.21?W?(m?1?K?1). 相似文献
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《Journal of Adhesion Science and Technology》2013,27(11):1003-1023
Compression of soldered and conductive adhesive joints resulted in both reversible and irreversible changes in the contact electrical resistivity. At a low stress (as low as 0.02 and 0.005 MPa for soldered and adhesive joints, respectively), the resistivity increased with almost complete reversibility as the compressive stress increased. At an intermediate stress (as low as 0.03 MPa) for both soldered and adhesive joints, the resistivity decreased with partial or complete reversibility as the stress increased. At a high stress (as high as 0.21 MPa) for the soldered joint only, the resistivity increased slightly with increasing stress. The resistivity of the soldered joint at no load increased irreversibly and gradually as stress cycling progressed, even at the lowest stress amplitude of 0.12 MPa. However, the resistivity of the adhesive joint at no load decreased irreversibly and gradually as stress cycling progressed, even at the lowest stress amplitude of 0.009 MPa. 相似文献
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《塑料、橡胶和复合材料》2013,42(1):33-38
AbstractTwo series of cross-linked polyurethaneurea (PUU) aqueous dispersions with polyoxypropylene glycerol and pentaerythritol as internal cross-linking agents were prepared and characterised. The results revealed that in comparison with the uncross-linked one, the cross-linked PUU films exhibited excellent waterproof performance and mechanical properties. The amount of water absorption was as low as 2?5 wt-%, the contact angle of water on the surface of this kind of film was as high as 96°, and the tensile strength was as high as 42?8 MPa. The cross-linked PUU films with polyoxypropylene glycerol and pentaerythritol as cross-linked agents showed different properties at the same cross-linking agent content. The prepared triol-cross-linked or tetra-cross-linked PUUs had great potential application in meeting the highly diversified demands in modern technologies such as coatings, leather finishing, adhesives, sealants, plastic coatings and wood finishes, where high water resistance and durability were required. 相似文献
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薛涛 《纤维素科学与技术》2012,20(2):46-50
以废弃棉短绒为模板,采用溶胶凝胶技术制备出新型多孔碳模板,研究了纤维素碳化的机理。多孔碳的收缩率随着树脂/棉短绒复合体中树脂含量的增大而减小;所得多孔碳的气孔率随着树脂/棉短绒复合体中树脂含量的增大而减小,也随着碳化温度的升高而减小;多孔碳的弯曲强度随着树脂/棉短绒复合体中酚醛树脂含量的增大而增大,也随着碳化温度的升高而增大。 相似文献