A new stearic acid method(SAM) has been used to prepare ultrafine K2La2Ti3O10 nanocrystalline. Each state of synthesis process was followed by the use of FT IR analysis. The resulting materials have been characterized...A new stearic acid method(SAM) has been used to prepare ultrafine K2La2Ti3O10 nanocrystalline. Each state of synthesis process was followed by the use of FT IR analysis. The resulting materials have been characterized by means of XRD, TEM, BET surface area analysis. The acid exchanging property of the obtained product was also studied. The experimental results showed that comparing with the product of traditional solid state reaction, the particle size of the K2La2Ti3O10 synthesized by SAM is greatly reduced, BET surface area is high(more than 11.83m2· g- 1) and has different acid exchanging properties. It can be easily exfoliated in 2mol· L- 1 HNO3 solution.展开更多
为了在10 k V电缆网络中确定缺陷的位置,提出了一种根据电缆在冲击电压下的不同响应特征对电缆进行绝缘诊断的新方法。在PSCAD/EMTDC中建立了工频叠加冲击电压下10 k V电缆网络仿真模型,分析了电流、电压在主电缆馈线上的暂态传播特性,...为了在10 k V电缆网络中确定缺陷的位置,提出了一种根据电缆在冲击电压下的不同响应特征对电缆进行绝缘诊断的新方法。在PSCAD/EMTDC中建立了工频叠加冲击电压下10 k V电缆网络仿真模型,分析了电流、电压在主电缆馈线上的暂态传播特性,利用电流变化表征电缆缺陷,判断缺陷位置。通过传播特性仿真发现,在冲击源的两侧电流呈双极性,而电压呈单极性。在仿真中设置电缆缺陷,发现了测试电缆段两侧的电流在有缺陷和无缺陷的情况下有明显区别。通过对比电缆在出现缺陷前后主馈线各节点的电流波形变化,能够判断电缆缺陷所在的位置。展开更多
文摘A new stearic acid method(SAM) has been used to prepare ultrafine K2La2Ti3O10 nanocrystalline. Each state of synthesis process was followed by the use of FT IR analysis. The resulting materials have been characterized by means of XRD, TEM, BET surface area analysis. The acid exchanging property of the obtained product was also studied. The experimental results showed that comparing with the product of traditional solid state reaction, the particle size of the K2La2Ti3O10 synthesized by SAM is greatly reduced, BET surface area is high(more than 11.83m2· g- 1) and has different acid exchanging properties. It can be easily exfoliated in 2mol· L- 1 HNO3 solution.
文摘为了在10 k V电缆网络中确定缺陷的位置,提出了一种根据电缆在冲击电压下的不同响应特征对电缆进行绝缘诊断的新方法。在PSCAD/EMTDC中建立了工频叠加冲击电压下10 k V电缆网络仿真模型,分析了电流、电压在主电缆馈线上的暂态传播特性,利用电流变化表征电缆缺陷,判断缺陷位置。通过传播特性仿真发现,在冲击源的两侧电流呈双极性,而电压呈单极性。在仿真中设置电缆缺陷,发现了测试电缆段两侧的电流在有缺陷和无缺陷的情况下有明显区别。通过对比电缆在出现缺陷前后主馈线各节点的电流波形变化,能够判断电缆缺陷所在的位置。
