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对一起因220 kV一次设备在倒闸操作过程中,电动机电源开关突然跳闸,致使隔离开关动、静触头之间产生电弧,危及电网和设备安全的这一危险情况进行了分析,找出危险根源,强调执行反事故措施的重要性. 相似文献
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在使用检测系统进行在线光缆检测时,不仅满足对所有光缆的资源管理和日常维护管理,而且在人员不足的时候用技术手段维护运行光缆,提高了整体管理的水平.本文主要介绍了运用新型的检测系统提升运行光缆的管理水平与管理经验. 相似文献
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Fracture behaviors of isotactic polypropylene/poly(ethylene oxide) blends: Effect of annealing 总被引:1,自引:0,他引:1
Haiyan WuXiaoxi Li Yonghong WangJun Wu Ting HuangYong Wang 《Materials Science and Engineering: A》2011,528(27):8013-8020
As a part of serial work about the toughening of isotactic polypropylene (iPP) during annealing treatment, this work reports the effect of annealing on fracture behaviors of iPP blend with a little of poly(ethylene oxide) (PEO). Injection-molded bars of an iPP/PEO blend were annealed at different temperatures (50-160 °C) for 12 h and at 100 °C for different durations (12-96 h). The fracture behaviors of the annealed samples, including notched Izod impact fracture, universal tensile fracture, and single-edge notched tensile (SENT) fracture, were comparatively investigated to establish the role of annealing in improving the fracture resistance of the sample. The results showed that the annealing treatment greatly influences the fracture resistance of the blend. The impact-fractured surface morphologies were characterized by scanning electron microscope (SEM) to clarify the possible mechanisms for the improvement of the fracture resistance. It was proposed that, the excellent fracture resistance of iPP with a minor phase of which exhibits relatively low melting temperature can be easily achieved through the simple annealing treatment, even if the minor phase is immiscible with iPP. 相似文献
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表面水解和热氧化对氮化硅粉料表面特性及分散特性的影响 总被引:4,自引:0,他引:4
选用了分散性能较差的4种商业氮化硅粉料,系统研究了表面水解及热氧化处理对氮化硅粉料表面特性及分散性能的影响,并结合粉料的DRIFT光谱、离子电导率和可溶性离子浓度、以及表面氧含量的分析,总结了氮化硅粉料分散性能较差的限制性因素,提出1种普适性的制备氮化硅水基浓悬浮体的新方法。 相似文献
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采用三维荧光指纹光谱技术对成都沙河的溶解性有机物(DOM)进行采样监测。结果表明,沙河水体中共检测到5个明显的荧光峰,分别为高、低激发波长类色氨酸荧光峰、类酪氨酸荧光峰和2个紫外腐殖质荧光峰,荧光峰T1(Ex/Em225/335nm),A1(Ex/Em225/415nm)和A2(Ex/Em250/410nm)出现在整个调查河流中;荧光峰T2(Ex/Em275/300nm)出现在大部分河段,在下游其强度明显增强,高激发波长类色氨酸荧光峰T1’(Ex/Em275/335nm)只出现在下游水样中。在中下游的部分河段出现了很强的T1,T1’T2,A1,A2荧光峰,某些河段污水偷排现象严重。 相似文献
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敏感陶瓷材料的制备及展望 总被引:8,自引:0,他引:8
本综合介绍了几种主要敏感陶瓷材料及元器件的制备和发展概况。比较了几种陶瓷超微粉料制备技术的优劣。并展望了敏感陶瓷的未来发展方向。 相似文献
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