排序方式: 共有27条查询结果,搜索用时 31 毫秒
1.
针对当前涂料行业发展现状及人才需求趋势,结合涂料化学课程特点,以培养出具有扎实理论基础及创新能力的应用型人才为目标,对课程内容和教学方式等方面进行了探索和改革。经实践表明,通过合理的选择课程内容,采用多种教学手段,明显地提高了学生对该课程的学习兴趣,获得了良好的教学效果。 相似文献
2.
The influence of mischmetal addition on physicochemical properties of PtSnNa/ZSM-5 catalyst was studied by means of XRF,H 2 chemisorption,XRD,TPR,NH 3-TPD and TPO techniques.The results showed that the presence of mischmetal had an obvious impact on the catalytic performance of the PtSnNa/ZSM-5 catalyst.A suitable content of mischmetal not only could enhance the interactions between Pt species and the support,but also inhibit the formation of coke during the reaction,thus improving the catalytic activity and stability.In our experiments,when the content of mischmetal was 3m%,the catalyst exhibited best catalytic performance.However,the continuous addition of mischmetal could promote the reduction of Sn species to metallic tin,which was disadvantageous to the reaction. 相似文献
3.
不同材料表面镍-磷-锌盐纳米复合化学镀层性质的比较 总被引:2,自引:0,他引:2
研究比较了D310硅钢片和A3钢片表面Ni-P-Zn3(PO4)2,Ni-P-ZnSnO3和Ni-P-ZnSiO3纳米复合化学镀层的外貌和性质。用扫描电子显微镜(SEM)观察外貌:称重法测定厚度,通过10%NaCl溶液,1%H2S气体加速腐蚀试验,10%,CuSO4溶液点滴试验,饱和KCl溶液循环伏安(CV)试验,抗粘性试验及抗高温氧化试验等多种手段测定其性能。结果表明:纳米复合化学镀层的性能优于镍-磷镀层和其它微米复合镀层。 相似文献
4.
6.
7.
8.
9.
石英毛细管气相色谱法快速测定对羟基苯甲醛 总被引:1,自引:1,他引:0
建立了对羟基苯甲醛的石英毛细管气相色谱快速分析方法,采用Rtx-5型石英毛细管柱(30m×0.32mm i.d.,0.25μm),检测器为:FID氢火焰离子化检测器,柱温:150℃,以冬青油为内标,在4.3min内即可完成定量检测。对羟基苯甲醛进样量在:0.010-4.000μg范围内线性关系良好,相关性系数τ=0.9997,方法平均回收率分别为:98.3%(n=9)。对羟基苯甲醛检测限为:0.167mg/L。该方法对对羟基苯甲醛合成工艺优化和样品的质量控制均具有指导作用。 相似文献
10.