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基于G-TF/SF技术的地面HEMP环境研究
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作者 杨超 谢海燕 +3 位作者 翟鑫洋 乔海亮 陈再高 高银军 《计算物理》 CSCD 北大核心 2024年第5期589-595,共7页
对于半空间问题的时域有限差分方法(FDTD)解决方案,基于传统总场散射场(TF/SF)技术的平面波加载方法无法直接用于地面电磁散射问题中,本文将广义总场散射场(G-TF/SF)方法推广至三维地面的高空电磁脉冲(HEMP)环境计算,四周采用卷积完全... 对于半空间问题的时域有限差分方法(FDTD)解决方案,基于传统总场散射场(TF/SF)技术的平面波加载方法无法直接用于地面电磁散射问题中,本文将广义总场散射场(G-TF/SF)方法推广至三维地面的高空电磁脉冲(HEMP)环境计算,四周采用卷积完全匹配层(CPML)吸收边界条件。G-TF/SF方法可有效消除数值计算中截取无限大地面产生的边缘效应,提高地面电磁环境的计算精度,且G-TF/SF边界只需要加载入射场,避免了反射场与透射场的计算。 展开更多
关键词 时域有限差分 广义总场散射场 高空电磁脉冲环境 地面
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Effects of Different Seedling Raising Substrates on Quality of Rice Seedlings
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作者 Xiangdong WANG zaigao chen 《Asian Agricultural Research》 2019年第1期68-71,共4页
Five different seedling raising substrates were used to take the place of the nutrient soil to cultivate rice seedling mechanical transplanting in Anqing,Anhui Province.The emergence rate,survival rate,quality of abov... Five different seedling raising substrates were used to take the place of the nutrient soil to cultivate rice seedling mechanical transplanting in Anqing,Anhui Province.The emergence rate,survival rate,quality of aboveground parts of seedlings,root system and dry weight and fresh weight were surveyed and analyzed.The results showed that the rice seedling raising substrates could significantly improve the seedling quality and survival rate of mechanically transplanted seedlings,especially the seedling raising substrates produced by Anhui Province Lufu Agriculture Science and Technology Stock Co.,Ltd.and Anhui Anqing Yike Seedling Material Co.,Ltd.Finally,it is recommended to promote the seedling raising substrate in large area,to lay a solid foundation for realizing high yield,high quality,and high efficiency of rice. 展开更多
关键词 RICE SEEDLING RAISING SUBSTRATE SEEDLING QUALITY SURVIVAL rate
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