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复杂形状单连通区域二维第一类格林函数的制作 被引量:4
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作者 王福谦 《大学物理》 北大核心 2013年第5期20-23,共4页
将保角变换法与镜像法相结合,制作边界形状复杂的单连通内的二维第一类格林函数,并利用数学软件MATLAB绘制出其等值线图.
关键词 复杂形状单联通区域 保角变换 镜像法 二维第一格林函数 等值线图
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两圆相交形成的闭合单连通区域第一类格林函数求解
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作者 解问鼎 陈钢 孙艺 《大学物理》 北大核心 2015年第1期19-22,共4页
求解了两圆导体柱板相交所形成的多种闭合单连通区域的第一类格林函数,并利用数学软件MATLAB绘制出其等值线图.
关键词 保角变换 二维第一格林函数 等值线图
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图半群中的相似性 被引量:1
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作者 朱用文 《烟台大学学报(自然科学与工程版)》 CAS 2002年第2期79-83,共5页
首次在图半群中应用群作用的方法 ,研究了图自同态的 (左、右 )相似以及强自同态半群中格林类的 (左、右 )相似 ,讨论了 (左、右 )相似的基本性质 ,得到了 (左、右 )相似类长及类数的公式 .
关键词 格林关系 强自同态半群 左相似 右相似 自同态摹群 格林类 图半群 相似性
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Spatial connectivity and distribution of landscape type in the natural secondary forests of eastern mountainous region,northeast China——a case study of Mao'ershan region in Heilongjiang Province
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作者 李淑娟 隋玉正 +2 位作者 冯海清 王凤友 李玉文 《Journal of Forestry Research》 SCIE CAS CSCD 2004年第2期141-144,i003,共5页
Mao'ershan region is representative in the natural secondary forested region of the eastern mountainous region, northeast China. The landscape nearest neighbor index and landscape connectivity index were calculate... Mao'ershan region is representative in the natural secondary forested region of the eastern mountainous region, northeast China. The landscape nearest neighbor index and landscape connectivity index were calculated with ARC/INFO software for Mao'ershan region. The spatial distribution of the landscape of the region was analyzed. The results showed that the landscape connectivity index of non-woodland was significantly higher than that of woodland. The landscape connectivity index of natural forest was nearly equal to zero, which means its fragmentation degree is high. The nearest neighbor index of plantation was lower than that of natural forest and non-forestland. Among the man-made forests, the distance index of the coniferous mixed plantation is the lowest, and its pattern is nearly glomeration. The landscape pattern of natural forest presented nearly random distribution. Among non-forest land, the distance index of cut blank was the lowest, and its pattern was also nearly glomeration. Keywords Landscape type - Landscape pattern - Nearest neighbor index - Landscape connectivity index - Natural secondary forest - Northeast China CLC number S759.92 Document code A Foundation item: This paper was supported by the Key Project of State Department of Science Technology (2002BA515B040).Biography: LI SHu-juan (1977), female. Lecture in Ocean University of China, Qingdao 266003, P. R. China.Responsible editor: Zhu Hong 展开更多
关键词 Landscape type Landscape pattern Nearest neighbor index Landscape connectivity index Natural secondary forest Northeast China
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