基于无线电缆的电梯智能故障诊断系统研究

为了解决随行电缆中存在的故障排查困难、线缆易疲劳断裂,以及在电梯控制系统运行中发生故障时及时发现和排除系统故障等问题,对电梯控制系统进行了研究,将无线通讯技术应用到电梯主控制板与轿厢控制板通讯中,实现了电梯无随行电缆化;在无线电梯安全回路的设计上采用了4个继电器将机房安全回路与轿厢安全回路串联在一起,在硬件电路设计上采用了以STM32W108芯片为核心的Zig Bee无线模块作为通讯模块;在无线电梯控制系统中还集成了一套基于专家系统的智能故障诊断系统;通过搭建实验平台进行了实验测试。实验结果表明:该故障诊断系统无线通讯正常,安全回路故障诊断无误。     

Preparation, characterization and catalytic properties of S2O8^2-/ZrO2-CeO2 solid superacid catalyst

A novel solid superacid catalyst S₂O₈^2–/ZrO₂-CeO₂ was prepared by a coprecipitation method and characterized by means of XRD, FTIR, BET, TEM and DSC/TG analysis methods. The results indicated that incorporation of appropriate amounts of Ce into the catalyst was beneficial to the formation of sole tetragonal ZrO₂ and effectively prevented from the formation of monoclinic ZrO₂, and restrained the loss of sulfated species. XRD revealed the presence of tetragonal Ce_0.16Zr_0.84O₂ phase in the case of S₂O₈^2–/ZrO₂-CeO₂ calcined above 500 °C. Catalytic activities of S₂O₈^2–/ZrO₂-CeO₂ for the esterification of lactic acid with n-butanol was studied. The results showed that the optimum conditions were as follows: calcination temperature of the catalyst 600 °C, n(lactic acid):n(n-butyl alcohol)=1.0:3.0, w(S₂O₈^2–/ZrO₂-CeO₂)=12.0%, reaction temperature 145 °C, and reaction time 2 h. The esterification efficiency of lactic acid was about 96.6%.     

固体超强酸S_2O_8~(2-)/ZrO_2-CeO_2催化合成乳酸丁酯的研究

以固体超强酸S2O82-/ZrO2-CeO2为催化剂,乳酸和正丁醇为原料合成乳酸丁酯。考察了催化剂的用量,反应物的配比、反应时间、反应温度、催化剂重复使用等因素对反应的影响。结果表明,催化合成乳酸丁酯的最佳条件为:n(丁醇)∶n(乳酸)=3.0∶1.0,w(S2O82-/ZrO2-CeO2)=12.0%(相对于乳酸),温度145℃,反应2.0 h,乳酸的酯化率达96.6%,催化剂可重复多次使用。     

巯基丙酸还原TeO_2水相一步法合成CdTe/ZnTe核壳型量子点

以TeO2为碲源,巯基丙酸(MPA)为稳定剂和还原剂,采用微波辅助加热法一步合成水溶性CdTe/ZnTe核壳结构的半导体量子点。考察了Cd/Zn反应物配比及MPA用量对CdTe/ZnTe量子点性能的影响,并用紫外、荧光光谱、高分辨透射电子显微镜(HRTEM)、X射线粉末衍射(XRD)光谱和EDX电子能谱对CdTe/ZnTe进行了表征。结果表明,在不需要另加NaBH4的条件下,同样能合成水溶性的CdTe/ZnTe量子点,且该核壳结构的CdTe/ZnTe量子点比单一的CdTe量子点具有更高的荧光量子产率。