计算机辅助管理法在维修管理中的应用

介绍了葫芦岛锌厂电厂在维修管理中应用计算机辅助管理法 ,加强了大中修管理 ,盘活了库存资金 ,增强了对设备事故的预测能力 ,降低了生产成本 ,创效 10 0多万元。     

Effect of sintering temperature and composition on microstructure and properties of PMS-PZT ceramics

The piezoelectric ceramics xPb（Mn1/3Sb2/3）O3-（1-x）Pb（Zr1/2Ti1/2）O3 （abbreviated as PMS-PZT） were synthesized by traditional ceramics process. The effect of sintering temperature and the amount of Pb（Mn1/3Sb2/3）O3 （abbreviated as PMS） on phase structure, microstructure, piezoelectric and dielectric properties of PMS-PZT ceramics was investigated. The results show that the pure perovskite phase is in all ceramics specimens, the phase structure of PMS-PZT ceramics changes from tetragonal phase to single rhombohedral phase with the increasing amount of PMS. The dielectric constant εr, Curie temperature Tc, electromechanical coupling factor kp and piezoelectric constant d33 decrease, whereas the mechanical quality factor Qm and dielectric loss tanδ increase with the increasing amount of PMS in system. The optimum sintering temperature is 1 200-1 250 ℃. It is concluded that the PMS-PZT （x=0.07） ceramics sintered at 1 250 ℃ is suitable for high-power piezoelectric transformer. These properties include εr=674.8, tanδ =0.005 25, kp=0.658, Qm= 1 520, d33=230 pC/N, Tc=275 ℃.     

PLC控制系统的抗干扰分析

首先分析了PLC控制系统中干扰信号的来源、成因,并从硬件电路设计、软件程序编制、PLC选型、电缆布线等诸多方面研究探讨提高PLC控制系统抗干扰能力的方法和措施。随着PLC在自动控制领域的日益普及,这些方法和措施对于提高PLC控制系统的抗干扰能力具有重要的经济意义和实用价值。     

淀粉/NaAA/CR吸水复合材料的性能在去离子水和盐溶液中的差异

采用机械共混法制备了淀粉/丙烯酸钠(NaAA)/氯丁橡胶(CR)吸水复合材料,考察了去离子水和3.5%(质量分数)NaCl溶液两种吸水介质对其力学性能和吸水性能的影响,并且观察了复合材料吸水前后的微观形貌。结果表明浸水后,随吸水量的增加,材料力学性能的降低;复合材料在盐溶液中的吸水率远小于在去离子水中的吸水率;在反复使用过程中,能够很好地保持其原有的吸水性能,具有优异的反复使用性能;通过扫描电子显微镜(SEM)观察了复合材料吸水前后的微观形态结构,吸水组分聚NaAA颗粒吸水干燥后表面发生褶皱。     

电场法检测复合绝缘子的实验研究

采用电场法在线检测技术，对复合绝缘子的检测进行了实验研究。实验表明，电场法能够检测出复合绝缘子内绝缘的大多数故障，可有效地发现绝缘中存在的导通性缺陷。该方法为带电检测复合绝缘子提供了一种手段。     

锆铝吸气泵的应用研究

锆铝吸气泵是利用非蒸散型吸气剂吸附活性气体的一种新型真空设备。它具有结构简单、体积小、无污染、无磁、无机械传动、使用方便、稳定可靠等特点。并在较宽的压强范围内具有大而稳定的抽气速率。70年代开始用于高能加速器、核聚变等科学领域,目前锆铝吸气泵的应用更加广泛。     

计算机基础课程思政探索与实践

从教师、学生、课程3个主体出发,提出三位一体的计算机基础课程思政构建思路,介绍计算机基础课程思政构建实践,总结一套围绕学生培养的,提升教师职业道德、课程思政能力的培养计划和课程教学方法.     

Preparation and infrared emissivities of alkali metal doped ZnO powders

Alkali metal（Li, Na, K） doped ZnO powders were synthesized by solid-state reaction at different calcination temperatures and holding time. Effects of holding time and K sources on the infrared emissivity of ZnO were investigated. The structure and surface morphologies of samples were characterized by X-ray diffraction（XRD） and scanning electron microscopy（SEM）. The UV-Vis absorption and infrared emissivities were investigated by a UV-Vis spectrophotometer and an infrared emissometer, respectively. XRD patterns confirm the wurtzite structure of the as prepared samples with single phase. Smooth grain surfaces are detected in all doped ZnO samples, while ZnO：Li and ZnO：Na present the aggregation of grains. The redshifts in the optical band-gap are observed in K-, Na-, and Li-doped ZnO with the values 3.150, 3.144, and 3.142 eV. Due to better crystalline quality, ZnO：K shows a lower emissivity than others. The emissivity of K-doped ZnO decreases to the minimum value（0.804）, at 1200 °C and holding 2 h. Compared with KNO3 as K source, K2CO3 doped ZnO has lower emissivities.     

超高压GIS中快速暂态过电压造成危害的原因分析

隔离开关切合小电容电流时产生的ＶＦＴＯ会对３００ｋＶ以上的造成危害,而对３００ｋＶ以下系统的影响则不大,对这个现象目前还没有满意的解释。本文通过计算,对ＶＦＴＯ的影响因素进行了研究。     

用超高频法检测GIS中的局部放电

针对GIS中局部放电测量面临的困难,采用了超高频法进行局部放电检测。研制的超高频法测试系统的试验结果证明此方法是可行的。