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硅中四空位扩展的Koster-Slater模型
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作者 申三国 范希庆 +1 位作者 张德萱 任尚元 《物理学报》 SCIE EI CAS CSCD 北大核心 1990年第6期970-976,共7页
本文用扩展的Koster-Slater模型计算了硅中V_4^-未配对电子的对称化波函数,用算得的波函数计算了缺陷电子局域在最近邻每个原子上的η~2及其s特征α~2,和超精细相互作用常数,确定V_4^-处于深能级为0.78eV的A_1对称态,给出与现有实验值... 本文用扩展的Koster-Slater模型计算了硅中V_4^-未配对电子的对称化波函数,用算得的波函数计算了缺陷电子局域在最近邻每个原子上的η~2及其s特征α~2,和超精细相互作用常数,确定V_4^-处于深能级为0.78eV的A_1对称态,给出与现有实验值相符合的结果。并指出,V_4^-的单个悬挂键上的η~2比其它具有单个悬挂键的缺陷小,是由于V_4^-的势分布向一侧有较大偏重所致。 展开更多
关键词 空位 扩展 缺陷 势空位模型
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AN AIR POLLUTION PREDICTION TECHNIQUE FOR URBAN DISTRICTS BASED ON MESO-SCALE NUMERICAL MODEL
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作者 闫敬华 徐建平 《Journal of Tropical Meteorology》 SCIE 2005年第1期51-59,共9页
Taking Shenzhen city as an example, the statistical and physical relationship between the density of pollutants and various atmospheric parameters are analyzed in detail, and a space-partitioned city air pollution pot... Taking Shenzhen city as an example, the statistical and physical relationship between the density of pollutants and various atmospheric parameters are analyzed in detail, and a space-partitioned city air pollution potential prediction scheme is established based on it. The scheme considers quantitatively more than ten factors at the surface and planetary boundary layer (PBL), especially the effects of anisotropy of geographical environment, and treats wind direction as an independent impact factor. While the scheme treats the prediction equation respectively for different pollutants according to their differences in dilute properties, it considers as well the possible differences in dilute properties at different districts of the city under the same atmospheric condition, treating predictions respectively for different districts. Finally, the temporally and spatially high resolution predictions for the atmospheric factors are made with a high resolution numerical model, and further the space-partitioned and time-variational city pollution potential predictions are made. The scheme is objective and quantitative, and with clear physical meaning, so it is suitable to use in making high resolution air pollution predictions. 展开更多
关键词 city air pollution potential prediction district-partition numerical model
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