制备了依托度酸和哌嗪的有机盐,并得到了其晶体结构。结构解析结果表明,依托度酸羧基上的氢转移到哌嗪的氮原子上,N H O氢键是维持结构稳定的主要分子间相互作用。与原药相比,新合成的盐的本征溶出速率和平衡溶解度分别提高了2.1倍和4....制备了依托度酸和哌嗪的有机盐,并得到了其晶体结构。结构解析结果表明,依托度酸羧基上的氢转移到哌嗪的氮原子上,N H O氢键是维持结构稳定的主要分子间相互作用。与原药相比,新合成的盐的本征溶出速率和平衡溶解度分别提高了2.1倍和4.8倍。此外,新合成的盐具有良好的水合稳定性,在25℃,相对湿度95%的条件下暴露28 d未发生相变。作为依托度酸的第一个有机盐,该盐是依托度酸有前景的固体存在形式。展开更多
基于人工触发闪电T179的10次回击过程,分析了雷电流作用下2个独立地网的相互作用及转移地电位特征,并通过冲击低压电源浪涌保护器(SPD),计算和评估了转移地电位冲击SPD的能量。结果发现,地网隔离40 m距离产生的转移电位(T G P)电压峰值...基于人工触发闪电T179的10次回击过程,分析了雷电流作用下2个独立地网的相互作用及转移地电位特征,并通过冲击低压电源浪涌保护器(SPD),计算和评估了转移地电位冲击SPD的能量。结果发现,地网隔离40 m距离产生的转移电位(T G P)电压峰值比较大,平均值可达–10.9 kV。T G P电压峰值与触发闪电电流峰值之间呈现非常好的正相关性,拟合优度R2达到0.97。冲击SPD的能量比较小,10次回击平均值为1.5 J,电子设备加装SPD浪涌保护器是相对安全。展开更多
A new concept is presented for air-to-air missile which is dynamic attack zone after being launched in random wind field. This new concept can be used to obtain the 4-dimensional （4-D） information regarding the dyna...A new concept is presented for air-to-air missile which is dynamic attack zone after being launched in random wind field. This new concept can be used to obtain the 4-dimensional （4-D） information regarding the dynamic envelope of an air-to-air missile at any flight time airned at different flight targets considering influences of random wind, in the situation of flight fighters coop- crated with missiles fighting against each other. Based on an air-to-air missile model, some typical cases of dynamic attack zone after being launched in random wind field were numerically simulated. Compared with the simulation results of traditional dynamic envelope, the properties of dynamic attack zone after being launched are as follows. The 4-D dynamic attack zone after being launched is inside traditional maximum dynamic envelope, but its forane boundary is usually not inside traditional no-escape dynamic envelope; Traditional dynamic attack zone can just be reliably used at launch time, while dynamic envelope after being launched can be reliably and accurately used during any flight antagonism time. Traditional envelope is a special case of dynamic envelope after being launched when the dynamic envelope is calculated at the launch time： the dynamic envelope after being launched can be inflt, enced by the random wind field.展开更多
文摘制备了依托度酸和哌嗪的有机盐,并得到了其晶体结构。结构解析结果表明,依托度酸羧基上的氢转移到哌嗪的氮原子上,N H O氢键是维持结构稳定的主要分子间相互作用。与原药相比,新合成的盐的本征溶出速率和平衡溶解度分别提高了2.1倍和4.8倍。此外,新合成的盐具有良好的水合稳定性,在25℃,相对湿度95%的条件下暴露28 d未发生相变。作为依托度酸的第一个有机盐,该盐是依托度酸有前景的固体存在形式。
文摘基于人工触发闪电T179的10次回击过程,分析了雷电流作用下2个独立地网的相互作用及转移地电位特征,并通过冲击低压电源浪涌保护器(SPD),计算和评估了转移地电位冲击SPD的能量。结果发现,地网隔离40 m距离产生的转移电位(T G P)电压峰值比较大,平均值可达–10.9 kV。T G P电压峰值与触发闪电电流峰值之间呈现非常好的正相关性,拟合优度R2达到0.97。冲击SPD的能量比较小,10次回击平均值为1.5 J,电子设备加装SPD浪涌保护器是相对安全。
文摘A new concept is presented for air-to-air missile which is dynamic attack zone after being launched in random wind field. This new concept can be used to obtain the 4-dimensional （4-D） information regarding the dynamic envelope of an air-to-air missile at any flight time airned at different flight targets considering influences of random wind, in the situation of flight fighters coop- crated with missiles fighting against each other. Based on an air-to-air missile model, some typical cases of dynamic attack zone after being launched in random wind field were numerically simulated. Compared with the simulation results of traditional dynamic envelope, the properties of dynamic attack zone after being launched are as follows. The 4-D dynamic attack zone after being launched is inside traditional maximum dynamic envelope, but its forane boundary is usually not inside traditional no-escape dynamic envelope; Traditional dynamic attack zone can just be reliably used at launch time, while dynamic envelope after being launched can be reliably and accurately used during any flight antagonism time. Traditional envelope is a special case of dynamic envelope after being launched when the dynamic envelope is calculated at the launch time： the dynamic envelope after being launched can be inflt, enced by the random wind field.
