The Han period cemetery at Maituo,Wushan, is a quite large graveyard in the eastern Chongqing area, measuring over 100, 000 sq m, where tombs were discovered nearly 100. Through surveys it was known that they belonged...The Han period cemetery at Maituo,Wushan, is a quite large graveyard in the eastern Chongqing area, measuring over 100, 000 sq m, where tombs were discovered nearly 100. Through surveys it was known that they belonged to four types in structure:the earth shaft,arched brick- or stone-chambered shaft or cave,archless one of the same structure,and rock-cut tomb. Based on the material of the 19 tombs excavated, the author divides the cemetery into four phases,i. e. the mid Western Han,late Western Han,Wang Mang period and Eastern Han. The 300 or so intact pottery objects yielded represent a large variety of types and complete evolutionary sequences,and provide criteria for the periodization of the Han period tombs in the eastern Chongqiong area. According to the distribution pattern, structure and funeral objects of the tombs, the eastern area of this cemetery must have been a clan graveyard and can exemplify the evolutionary pattern of couple joint burial during the middle and late Western Han period. In addition,the author discusses the meanings and profound implications of four symbol-incised pottery vessels and six pottery figurines.展开更多
In September 2000 to January 2001, the Sichuan Provincial Institute of Cultural Relics and Archaeology and other institutions carried out drillings and excavations in the Xiufeng-cun cemetery in Wushan County, Chongqi...In September 2000 to January 2001, the Sichuan Provincial Institute of Cultural Relics and Archaeology and other institutions carried out drillings and excavations in the Xiufeng-cun cemetery in Wushan County, Chongqing. They discovered 30 graves from the Han to the Song periods, including six excavated, of which three are earthen-pit burials of the Western Han period, two brick-chambered of the Eastern Han, and one brick-chambered of the Song period. These graves are small in size except for medium-sized earthen-pit M3 and M4 of the Western Han. Among the funeral objects the most important is a gilt bronze belt with an Ordos-style buckle at either end and shell pendants on the body. This is the first discovered Ordos bronze belt in the Three Gorges region.展开更多
【目的】在已有文献研究基础上,构建基于逻辑回归的滑坡易发性评价模型,并与基于随机森林的模型进行分析比较,探讨出适用于三峡库区巫山县的滑坡易发性评价模型。【方法】选取地质条件、地形地貌、环境条件、人类工程活动等4方面影响下...【目的】在已有文献研究基础上,构建基于逻辑回归的滑坡易发性评价模型,并与基于随机森林的模型进行分析比较,探讨出适用于三峡库区巫山县的滑坡易发性评价模型。【方法】选取地质条件、地形地貌、环境条件、人类工程活动等4方面影响下的22个因子作为滑坡易发性影响因子,根据研究区963处历史滑坡点,建立30m×30m栅格地理空间数据库;进一步在数据库中,按历史滑坡与非滑坡1∶10的比例构建地理空间数据样本集,基于十折交叉验证法选择最佳样本数据后,进行逻辑回归模型训练;最后,利用最佳样本训练后的模型,进行全域滑坡易发性仿真分析,并将结果划分为低、较低、中、较高、高共5种易发性等级。【结果】逻辑回归模型训练集、测试集的受试者工作特征曲线下面积(Area under curve,AUC)值分别为0.803和0.787;有63.24%历史滑坡落入面积比为26.26%的较高滑坡易发性区划中。【结论】基于逻辑回归和随机森林构建的滑坡易发性评价模型均具有良好的稳定性及预测功能,但随机森林模型性能优于逻辑回归模型性能,更适用于三峡库区滑坡易发性区划研究。展开更多
文摘The Han period cemetery at Maituo,Wushan, is a quite large graveyard in the eastern Chongqing area, measuring over 100, 000 sq m, where tombs were discovered nearly 100. Through surveys it was known that they belonged to four types in structure:the earth shaft,arched brick- or stone-chambered shaft or cave,archless one of the same structure,and rock-cut tomb. Based on the material of the 19 tombs excavated, the author divides the cemetery into four phases,i. e. the mid Western Han,late Western Han,Wang Mang period and Eastern Han. The 300 or so intact pottery objects yielded represent a large variety of types and complete evolutionary sequences,and provide criteria for the periodization of the Han period tombs in the eastern Chongqiong area. According to the distribution pattern, structure and funeral objects of the tombs, the eastern area of this cemetery must have been a clan graveyard and can exemplify the evolutionary pattern of couple joint burial during the middle and late Western Han period. In addition,the author discusses the meanings and profound implications of four symbol-incised pottery vessels and six pottery figurines.
文摘In September 2000 to January 2001, the Sichuan Provincial Institute of Cultural Relics and Archaeology and other institutions carried out drillings and excavations in the Xiufeng-cun cemetery in Wushan County, Chongqing. They discovered 30 graves from the Han to the Song periods, including six excavated, of which three are earthen-pit burials of the Western Han period, two brick-chambered of the Eastern Han, and one brick-chambered of the Song period. These graves are small in size except for medium-sized earthen-pit M3 and M4 of the Western Han. Among the funeral objects the most important is a gilt bronze belt with an Ordos-style buckle at either end and shell pendants on the body. This is the first discovered Ordos bronze belt in the Three Gorges region.
文摘【目的】在已有文献研究基础上,构建基于逻辑回归的滑坡易发性评价模型,并与基于随机森林的模型进行分析比较,探讨出适用于三峡库区巫山县的滑坡易发性评价模型。【方法】选取地质条件、地形地貌、环境条件、人类工程活动等4方面影响下的22个因子作为滑坡易发性影响因子,根据研究区963处历史滑坡点,建立30m×30m栅格地理空间数据库;进一步在数据库中,按历史滑坡与非滑坡1∶10的比例构建地理空间数据样本集,基于十折交叉验证法选择最佳样本数据后,进行逻辑回归模型训练;最后,利用最佳样本训练后的模型,进行全域滑坡易发性仿真分析,并将结果划分为低、较低、中、较高、高共5种易发性等级。【结果】逻辑回归模型训练集、测试集的受试者工作特征曲线下面积(Area under curve,AUC)值分别为0.803和0.787;有63.24%历史滑坡落入面积比为26.26%的较高滑坡易发性区划中。【结论】基于逻辑回归和随机森林构建的滑坡易发性评价模型均具有良好的稳定性及预测功能,但随机森林模型性能优于逻辑回归模型性能,更适用于三峡库区滑坡易发性区划研究。
