选取2021年6月28日山西省临汾市隰县一次高炮防雹作业过程,利用隰县X波段相控阵双偏振雷达数据分析作业前后强对流云变化的现象和机理。高炮防雹作业后冰雹云单体的宏观特征、动力和微物理的垂直结构均出现短时间明显变化。高炮防雹作业...选取2021年6月28日山西省临汾市隰县一次高炮防雹作业过程,利用隰县X波段相控阵双偏振雷达数据分析作业前后强对流云变化的现象和机理。高炮防雹作业后冰雹云单体的宏观特征、动力和微物理的垂直结构均出现短时间明显变化。高炮防雹作业后1 min 55 dBZ顶高急剧下降约2 km至0℃层以下,水平反射率因子ZH的强回波垂直结构在0℃层断裂,径向速度散度显示单体前部和后部的辐合带减弱、消失,差分反射率ZDR在近地面增大,ZDR柱消失,差分相移率KDP在中低层增大,共极化相关系数ρ_(hv)从0℃层到近地面表现为0.94~0.96的柱状区,单体核心上部的过冷水小范围中心消失,0℃层以下由雨夹雹、霰、湿雪及各种雨的混合柱状分布转为低层大雨。这些短时间的明显变化现象支持爆炸防雹理论。展开更多
In this study, SiOx films were deposited by a dielectric barrier discharge (DBD) plasma gun at an atmospheric pressure. The relationship of the film structures with plasma powers was investigated by Fourier transfor...In this study, SiOx films were deposited by a dielectric barrier discharge (DBD) plasma gun at an atmospheric pressure. The relationship of the film structures with plasma powers was investigated by Fourier transform infrared spectroscopy (FTIR), and scanning electron microscope (SEM). It was shown that an uniform and cross-linking structure film was formed by the DBD gun. As an application, the SiOx films were deposited on a carbon steel surface for the anti-corrosion purpose. The experiment was carried out in a 0.1 M NaCl solution. It was found that a very good anti-corrosive property was obtained, i.e., the corrosion rate was decreased c.a. 15 times in 5% NaCl solution compared to the non-SiOx coated steel, as detected by the potentiodynamic polarization measurement.展开更多
文摘选取2021年6月28日山西省临汾市隰县一次高炮防雹作业过程,利用隰县X波段相控阵双偏振雷达数据分析作业前后强对流云变化的现象和机理。高炮防雹作业后冰雹云单体的宏观特征、动力和微物理的垂直结构均出现短时间明显变化。高炮防雹作业后1 min 55 dBZ顶高急剧下降约2 km至0℃层以下,水平反射率因子ZH的强回波垂直结构在0℃层断裂,径向速度散度显示单体前部和后部的辐合带减弱、消失,差分反射率ZDR在近地面增大,ZDR柱消失,差分相移率KDP在中低层增大,共极化相关系数ρ_(hv)从0℃层到近地面表现为0.94~0.96的柱状区,单体核心上部的过冷水小范围中心消失,0℃层以下由雨夹雹、霰、湿雪及各种雨的混合柱状分布转为低层大雨。这些短时间的明显变化现象支持爆炸防雹理论。
基金supported by the National Natural Science Foundation of China(No.10475010)
文摘In this study, SiOx films were deposited by a dielectric barrier discharge (DBD) plasma gun at an atmospheric pressure. The relationship of the film structures with plasma powers was investigated by Fourier transform infrared spectroscopy (FTIR), and scanning electron microscope (SEM). It was shown that an uniform and cross-linking structure film was formed by the DBD gun. As an application, the SiOx films were deposited on a carbon steel surface for the anti-corrosion purpose. The experiment was carried out in a 0.1 M NaCl solution. It was found that a very good anti-corrosive property was obtained, i.e., the corrosion rate was decreased c.a. 15 times in 5% NaCl solution compared to the non-SiOx coated steel, as detected by the potentiodynamic polarization measurement.