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自然结构条件下完全非线性抛物方程粘性解的存在唯一性与正则性
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作者 朱汝金 《北京师范大学学报(自然科学版)》 CSCD 1994年第3期290-300,共11页
在自然结构条件下证明了完全非线性一致抛物型方程ut+F(x,t,u,Du,D2u)=0的第一边值问题粘性解的存在唯一性与Holder及Lipschitz正则性。
关键词 自然结构条件 粘性解 抛物型方程
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Vulnerability of Large City and Its Implication in Urban Planning: A Perspective of Intra-urban Structure 被引量:9
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作者 XIU Chunliang CHENG Lin +1 位作者 SONG Wei WU Wei 《Chinese Geographical Science》 SCIE CSCD 2011年第2期204-210,共7页
Vulnerability is a new field and analytical tool in the study of urban safety. Analysis and assessment of vulnerability provide a new basis for urban planning. This study constructed a quantitative index system for as... Vulnerability is a new field and analytical tool in the study of urban safety. Analysis and assessment of vulnerability provide a new basis for urban planning. This study constructed a quantitative index system for assessing vulnerability, based on the city′s sensitivity and emergency response capacity. City size, density, and spatial form influence a city′s sensitivity to crises and risks, to which vulnerability is positively related. Levels of socio-economic development, infrastructures, and emergency management contribute to a city′s emergency response capacity, with which vulnerability is inversely associated. Vulnerability of 19 large Chinese cities was assessed. Harbin and Shenzhen demonstrated the highest and lowest vulnerability among 19 cities, while Beijing, Shanghai and Guangzhou ranked the 5th, the 9th and the 12th. Spatially, northern cities tended to be more vulnerable than southern cities. And the differences in vulnerability among cities were explored based on cities′ physical geography conditions, level of socioeconomic development, infrastructures, regional status, history of disaster, history of urban planning and development, government policies, etc. 展开更多
关键词 large city VULNERABILITY urban safety urban planning
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