The central extension of the (1+1)-dimensional Poincaré algebra by including fermionic charges which obey not supersymmetric algebra, but a special graded algebra containing in the right hand side a central eleme...The central extension of the (1+1)-dimensional Poincaré algebra by including fermionic charges which obey not supersymmetric algebra, but a special graded algebra containing in the right hand side a central element only is obtained. The corresponding theory being the fermionic extension of the lineal gravity is proposed. We considered the algebra of generators, the field transformations and found Lagrangian and equation of motion, then we derived the Casimir operator and obtained the con- stant black hole mass.展开更多
Household structure is an important aspect of family change during China’s modernization process.Existing literature has demonstrated significant associations between various factors and household structure,but the s...Household structure is an important aspect of family change during China’s modernization process.Existing literature has demonstrated significant associations between various factors and household structure,but the spatial variation in these relationships has not been examined.Using the 2010 Chinese population census data and geographically weighted regression(GWR)model,this study explored the spatial patterns of three-generation lineal households,a functionally important household type in China,and its influencing factors.There was significant heterogeneity in the distribution of three-generation lineal households.Socioeconomic,demographic,and cultural factors were all significantly related to the proportion of three-generation lineal households,but the relationships are place-specific in terms of direction and magnitude.These results suggest that the distribution of Chinese household structures cannot be explained by a single framework of family modernization theory but is determined by the interplay of various local characteristics.Especially,population migration plays an equally important role in affecting household structure than socioeconomic development in China.This work contributes to the family literature by highlighting the spatial heterogeneity in the impact of varying factors on household structure.Beyond the classic modernization theory,it sets a contextualized framework for understanding how Chinese household change in response to the rapid social transformation.展开更多
针对传统单一水体提取方法中常见的断线问题,本文利用一种结合遥感光谱信息和DEM的自适应搜索算法提取线状水体,并评估该算法在不同空间分辨率数据提取线状水体的适用性。首先以广州市水体为对象,利用30 m Landsat OLI和16 m GF1-WFV影...针对传统单一水体提取方法中常见的断线问题,本文利用一种结合遥感光谱信息和DEM的自适应搜索算法提取线状水体,并评估该算法在不同空间分辨率数据提取线状水体的适用性。首先以广州市水体为对象,利用30 m Landsat OLI和16 m GF1-WFV影像获取归一化水体指数(NDWI);然后选取30 m分辨率的ASTER GDEM和12.5 m分辨率的ALOS高程数据获取河网数据。通过选择合适的搜索方阵和高差阈值作为提取参数提取河道数据,并针对水体指数提取结果中部分区域的断线问题,空间叠加河道数据,得到最终的河道信息。结果表明,与单一水体指数提取结果相比,水体指数结合DEM自适应搜索算法(NDWI+12.5 m DEM和NDWI+30 m DEM)提取的线状水体连续且准确,总体精度分别达90.5%和95%,特别是12.5 m DEM数据在细节捕捉方面展现出更明显优势,具有更高的精度。展开更多
文摘The central extension of the (1+1)-dimensional Poincaré algebra by including fermionic charges which obey not supersymmetric algebra, but a special graded algebra containing in the right hand side a central element only is obtained. The corresponding theory being the fermionic extension of the lineal gravity is proposed. We considered the algebra of generators, the field transformations and found Lagrangian and equation of motion, then we derived the Casimir operator and obtained the con- stant black hole mass.
基金National Social Science Foundation of China,No.20BRK043。
文摘Household structure is an important aspect of family change during China’s modernization process.Existing literature has demonstrated significant associations between various factors and household structure,but the spatial variation in these relationships has not been examined.Using the 2010 Chinese population census data and geographically weighted regression(GWR)model,this study explored the spatial patterns of three-generation lineal households,a functionally important household type in China,and its influencing factors.There was significant heterogeneity in the distribution of three-generation lineal households.Socioeconomic,demographic,and cultural factors were all significantly related to the proportion of three-generation lineal households,but the relationships are place-specific in terms of direction and magnitude.These results suggest that the distribution of Chinese household structures cannot be explained by a single framework of family modernization theory but is determined by the interplay of various local characteristics.Especially,population migration plays an equally important role in affecting household structure than socioeconomic development in China.This work contributes to the family literature by highlighting the spatial heterogeneity in the impact of varying factors on household structure.Beyond the classic modernization theory,it sets a contextualized framework for understanding how Chinese household change in response to the rapid social transformation.
文摘针对传统单一水体提取方法中常见的断线问题,本文利用一种结合遥感光谱信息和DEM的自适应搜索算法提取线状水体,并评估该算法在不同空间分辨率数据提取线状水体的适用性。首先以广州市水体为对象,利用30 m Landsat OLI和16 m GF1-WFV影像获取归一化水体指数(NDWI);然后选取30 m分辨率的ASTER GDEM和12.5 m分辨率的ALOS高程数据获取河网数据。通过选择合适的搜索方阵和高差阈值作为提取参数提取河道数据,并针对水体指数提取结果中部分区域的断线问题,空间叠加河道数据,得到最终的河道信息。结果表明,与单一水体指数提取结果相比,水体指数结合DEM自适应搜索算法(NDWI+12.5 m DEM和NDWI+30 m DEM)提取的线状水体连续且准确,总体精度分别达90.5%和95%,特别是12.5 m DEM数据在细节捕捉方面展现出更明显优势,具有更高的精度。
