It is difficult to detect and extinguish direct current(DC)arc in power electronics systems,and the arc could easily lead to a fire and cause great damage to surrounding equipment.A DC arc generation simulation unit i...It is difficult to detect and extinguish direct current(DC)arc in power electronics systems,and the arc could easily lead to a fire and cause great damage to surrounding equipment.A DC arc generation simulation unit is established,in which DC series arcs are generated by dragging the moving electrode away from the fixed one with the help of the stepper motor.In addition,a ferrite rod antenna is used to receive the electromagnetic radiation signals induced by the arcs.Based on experiments using the unit,the general characteristics of DC arc,including the pulse characteristics of arc current and source output in corresponding time window,and the frequency-domain characteristics of arc current,are studied.With discussion on three detection methods,it is concluded that the variation of current and voltage of arc,the spectrum of the arc current during the discontinuous intervals and the radiating electromagnetic signal are all features that can be adopted for detecting DC series arc.Therefore,a synthetic judgment method is suggested for further study.展开更多
针对现有污水样本快速检测技术存在的不足,以及传统实验室质谱技术无法应用于现场快速检测、检测耗时较长等问题,本文提出了一种基于脉冲直流电喷雾电离质谱(pulsed-DC-ESI-MS)测定生活污水中11种常见毒品(吗啡、甲基苯丙胺、去甲氯胺...针对现有污水样本快速检测技术存在的不足,以及传统实验室质谱技术无法应用于现场快速检测、检测耗时较长等问题,本文提出了一种基于脉冲直流电喷雾电离质谱(pulsed-DC-ESI-MS)测定生活污水中11种常见毒品(吗啡、甲基苯丙胺、去甲氯胺酮、苯丙胺、3,4-亚甲基双氧甲基苯丙胺、可卡因、6-单乙酰吗啡、3,4-亚甲基双氧苯丙胺、苯甲酰爱康宁、氯胺酮、可待因)的快速检测方法。污水样品经浓盐酸调节pH至2,用Oasis PRiME MCX固相萃取柱进行萃取,萃取液经氮吹至近干后用200μL甲醇复溶,涡旋0.5 min;复溶后的样品溶液经0.22μm有机相滤膜过滤后采用pulsed-DC-ESI-MS进行分析。方法学验证结果表明,11种毒品在各自的线性范围内具有良好的线性关系,相关系数(r2)均≥0.9986,检出限(LOD)为0.01~0.5μg/L,定量限(LOQ)为0.05~5μg/L。在低、中、高3个加标水平下,11种毒品的回收率为88.0%~107.6%,日内和日间精密度均≤8.5%。该方法检测速度快,大大提高了检测效率,适用于生活污水中常见毒品的快速检测分析。展开更多
基于YNvd平衡变压器和综合潮流控制器(integrated power flow controller,IPFC)相结合构成的同相供电系统,在机车运行状态改变时进行了仿真分析。当同相供电系统采用传统型电流检测方法,在机车由牵引状态转变为电气制动状态时,由于传统...基于YNvd平衡变压器和综合潮流控制器(integrated power flow controller,IPFC)相结合构成的同相供电系统,在机车运行状态改变时进行了仿真分析。当同相供电系统采用传统型电流检测方法,在机车由牵引状态转变为电气制动状态时,由于传统型电流检测方法的缺陷性,IPFC直流侧电容电压会急剧上升。而基于Fryze功率定义的改进型电流检测方法则可以避免该问题,另外改进型电流检测方法可应用于部分补偿模式。仿真结果证明了改进型电流检测方法的可行性。展开更多
基金Project supported by International Cooperation Project in Shaanxi Province of China(2012KW-01)
文摘It is difficult to detect and extinguish direct current(DC)arc in power electronics systems,and the arc could easily lead to a fire and cause great damage to surrounding equipment.A DC arc generation simulation unit is established,in which DC series arcs are generated by dragging the moving electrode away from the fixed one with the help of the stepper motor.In addition,a ferrite rod antenna is used to receive the electromagnetic radiation signals induced by the arcs.Based on experiments using the unit,the general characteristics of DC arc,including the pulse characteristics of arc current and source output in corresponding time window,and the frequency-domain characteristics of arc current,are studied.With discussion on three detection methods,it is concluded that the variation of current and voltage of arc,the spectrum of the arc current during the discontinuous intervals and the radiating electromagnetic signal are all features that can be adopted for detecting DC series arc.Therefore,a synthetic judgment method is suggested for further study.
文摘针对现有污水样本快速检测技术存在的不足,以及传统实验室质谱技术无法应用于现场快速检测、检测耗时较长等问题,本文提出了一种基于脉冲直流电喷雾电离质谱(pulsed-DC-ESI-MS)测定生活污水中11种常见毒品(吗啡、甲基苯丙胺、去甲氯胺酮、苯丙胺、3,4-亚甲基双氧甲基苯丙胺、可卡因、6-单乙酰吗啡、3,4-亚甲基双氧苯丙胺、苯甲酰爱康宁、氯胺酮、可待因)的快速检测方法。污水样品经浓盐酸调节pH至2,用Oasis PRiME MCX固相萃取柱进行萃取,萃取液经氮吹至近干后用200μL甲醇复溶,涡旋0.5 min;复溶后的样品溶液经0.22μm有机相滤膜过滤后采用pulsed-DC-ESI-MS进行分析。方法学验证结果表明,11种毒品在各自的线性范围内具有良好的线性关系,相关系数(r2)均≥0.9986,检出限(LOD)为0.01~0.5μg/L,定量限(LOQ)为0.05~5μg/L。在低、中、高3个加标水平下,11种毒品的回收率为88.0%~107.6%,日内和日间精密度均≤8.5%。该方法检测速度快,大大提高了检测效率,适用于生活污水中常见毒品的快速检测分析。
文摘基于YNvd平衡变压器和综合潮流控制器(integrated power flow controller,IPFC)相结合构成的同相供电系统,在机车运行状态改变时进行了仿真分析。当同相供电系统采用传统型电流检测方法,在机车由牵引状态转变为电气制动状态时,由于传统型电流检测方法的缺陷性,IPFC直流侧电容电压会急剧上升。而基于Fryze功率定义的改进型电流检测方法则可以避免该问题,另外改进型电流检测方法可应用于部分补偿模式。仿真结果证明了改进型电流检测方法的可行性。
