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离子在近电子能损阈值能区诱发云母表面小丘形成 被引量:1
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作者 靳博 魏龙 +13 位作者 牛犇 张琦 李鹏飞 包良满 雷前涛 管世王 靳定坤 宋光银 谢一鸣 哈帅 崔莹 马越 张红强 陈熙萌 《原子能科学技术》 EI CAS CSCD 北大核心 2019年第5期769-775,共7页
利用0.65 MeV的He^+离子轰击白云母膜,并在大气环境下用原子力显微镜(AFM)的轻敲模式分析了辐照后的膜表面。实验结果显示,在不同温度下离子诱导的小丘高度在小于1 nm到几nm之间,且室温条件下能诱发小丘生成的He^+离子电子能损阈值在0.4... 利用0.65 MeV的He^+离子轰击白云母膜,并在大气环境下用原子力显微镜(AFM)的轻敲模式分析了辐照后的膜表面。实验结果显示,在不同温度下离子诱导的小丘高度在小于1 nm到几nm之间,且室温条件下能诱发小丘生成的He^+离子电子能损阈值在0.44 keV/nm以下。此外,升高温度至973 K并在其中选取不同温度进行表面辐照来验证观测到的小丘结构。实验发现,相比于室温,小丘直径和高度的统计分布在更高温度下表现出了更大的歧离。分别利用分析热峰模型和双温热峰模型计算了辐照过程中的核能损与电子能损,并选取了用能损在阈值附近的离子辐照所产生的小丘的实验数据与模拟结果相比较,发现实验结果与双温热峰模型吻合较好。 展开更多
关键词 小丘结构 白云母 热退火 电子能损阈值
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Eco-economic Background of Hilly-Gullied Loess Region and Optimized Eco-productive Paradigm of Small Watersheds 被引量:3
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作者 孔正红 张新时 朱桂杰 《Acta Botanica Sinica》 CSCD 2003年第10期1174-1185,共12页
A thorough analysis on its natural environment as well as social economic status of the hilly-gullied loess region is presented. A small watershed, the dominant landscape unit of the region, has been singled out for f... A thorough analysis on its natural environment as well as social economic status of the hilly-gullied loess region is presented. A small watershed, the dominant landscape unit of the region, has been singled out for further and specific study on landscape pattern and function, its social and economic distinctions. The authors proposed several principles based on its eco-economic background study, which includes water balance and efficient use principle, co-development of grass and agro-forestry principle, location optimization principle. Integrated with detailed analysis of a small watershed, an eco-productive paradigm for the loess land's development based on a small watershed scale was worked out. It consists of circle pattern with villages at core for high efficient agriculture production, hierarchical pattern along the slope for eco-economic development, point-axis pattern for commodity production and circulation in small watersheds and core-margin pattern for exchanges among watersheds. 展开更多
关键词 hilly-gullied loess region small watershed landscape pattern and function location optimization
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