宋代景德镇青白瓷的审美研究

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。     

浅析课程教学与教学相长

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。     

邻硝基苯甲醛合成方法研究进展

综述了近年来国内外有关邻硝基苯甲醛化学合成方法的研究进展和成果。重点阐述了以邻硝基苄醇、邻硝基甲苯和其它化合物为起始原料,以过氧化物、铬酐、高锰酸钾和氧气／空气等为氧化剂的合成方法。其中,以邻硝基甲苯为原料、金属卟啉为催化剂、氧气／空气为氧化剂的合成方法具有反应条件温和、氧化剂清洁且廉价易得、操作简单、环境友好等优点,具有广阔的应用前景。     

生物质基合成气的净化

在阐述生物质能源利用的技术基础上,提出了一条全新的用于生物质基燃气净化的工艺路线,即采用旋风分离器加单管式过滤器除尘,催化分解法脱氨,ＮＣ２３０１脱氯剂脱氯,干法氧化铁粗脱硫加氧化锌精脱硫脱除硫化氢,干法氧化锰脱除ＳＯ２,３０９３脱氧的工艺组合方式。     

一种新型塑料脱漆剂的设计与研究

以N,N-二甲基甲酰胺为主溶剂、环己酮为助溶剂,水为稀释剂,氢氧化钠为促进剂,十二烷基苯磺酸钠为表面活性剂,液体石蜡为封闭剂,设计了一种新型低毒、低挥发性、环境污染小,低成本的塑料脱漆剂。分别研究了溶剂、促进剂配比及表面活性剂含量对脱漆剂脱漆效果的影响,同时研究了液体石蜡对脱漆剂挥发速度的影响。结果表明,N,N-二甲基甲酰胺质量分数为15%,环己酮为3%,水为54%,氢氧化钠为20%,十二烷基苯磺酸钠为2%,液体石蜡为6%时,所得脱漆剂效果好,毒性、腐蚀性和挥发性低。     

Effects of firing temperature on the microstructures and properties of porous mullite ceramics prepared by foam-gelcasting

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).     

High‐temperature Bending Strength of Self‐Healing Ni/Al2O3 Nanocomposites

Bending strength of 5 vol.% Ni/Al₂O₃ composites as a function of testing temperature is investigated at temperatures ranging from room temperature to 1200°C. Self‐healing performance at high temperatures of the composites is evaluated by conducting high‐temperature bending tests for as‐sintered, as‐cracked, and as‐healed specimens. Bending strength of as‐sintered specimens dramatically decreases from 995 MPa at room temperature to 205 MPa at 1200°C. Additionally, the plastic deformation of the as‐sintered specimens occurs when the testing temperature reaches to 1200°C. The values of high‐temperature bending strength of as‐healed specimens are comparable with those of as‐sintered specimens. Similar to that of as‐sintered specimens, bending strength of as‐healed specimens degrades when the testing temperature increases. Results of the present study indicate that the recovery of bending strength by the self‐healing function is able to achieve at temperatures as high as 1200°C. Unlike the mechanical behaviors at high temperatures of as‐sintered and as‐healed specimens, the bending strength of as‐cracked specimens slightly increases with the increase of testing temperature. This phenomenon is attributed to the effect of the self‐healing mechanism during high‐temperature bending tests.     

一种新型镁合金脱漆剂的研制

以苯甲醇为主溶剂,乙烯基乙醚为助溶剂,三乙醇胺为活化剂,十二烷基苯磺酸钠为表面活性剂,添加剂A为缓蚀剂,石蜡为阻挥发剂,甲基纤维素为增稠剂,制备了一种镁合金基体的新型低毒,低腐蚀性的脱漆剂.分别研究了主、助溶剂配比,活化剂、表面活性剂及增稠剂质量分数对脱漆剂脱漆时间的影响,同时研究了缓蚀剂对脱漆效果影响.结果表明,当w...     

离子液体在纳米材料合成中的应用

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。     

三价铬电镀工艺初步研究

本文以甲酸-尿素体系三价铬镀铬液为基础液,石墨电极为阳极条件下,以钢片或铜片为阴极,探讨了不同润湿剂和用量,不同酸度对三价铬电镀效果的影响,得到较好的三价铬。镀铬条件是:石墨电极作阳极,铜片作阴极,OP乳化剂作润湿剂,pH=0.5,可得到光泽度较好,有一定厚度的铬镀层。