Environmental archaeology of archaeological sites on both sides of the Dachang section in the Daning River,the Three Gorges of the Yangtze River,shows that riverbed evolution has a great influence on the distribution ...Environmental archaeology of archaeological sites on both sides of the Dachang section in the Daning River,the Three Gorges of the Yangtze River,shows that riverbed evolution has a great influence on the distribution of archaeological sites during the prehistorical and historical period,and it restricts human activity and the development of ancient culture.Field investigation,dating data,paleocurrent analysis of 100 gravels on the riverbed and archaeological excavation reveal that the riverbed of the Dachang section developed in the Shuangyantang region during the early stage,after about 30 kaBP it shifted westward gradually and reached the present place.Along with the westward shift,the focus of ancient culture changed for several times.In the Western Zhou Dynasty's period,the east riverbank of the Daning River was the main residential area.During the Han Dynasty,along with the westward shift,the living space of ancient people was no longer confined to the east riverbank and the focus of culture moved westward.Then the Zhangjiawan site became the main dwelling district.In the late Han Dynasty, the villages were flooded and the ancients had to immigrate to a high place.Tombs of the Han and the Jin Dynasties outcropped on the flood plain of the east bank because their surface sediments were eroded by several flood events and the westward shift of the riverbed.展开更多
Based on Remote Sensing(RS),Geographical Information Systems(GIS),and the Spatial Principal Compo-nent Analysis(SPCA)method,the integrated assessment and changes in the ecological environment of Daning River Watershed...Based on Remote Sensing(RS),Geographical Information Systems(GIS),and the Spatial Principal Compo-nent Analysis(SPCA)method,the integrated assessment and changes in the ecological environment of Daning River Watershed are studied in this paper.The watershed is located in the Three Gorge Area in China.The result of the integrated assessment showed that level 9 had the biggest proportion in the year 1990,which was about 40%.In the year 2000,however,there were no levels with a proportion significantly bigger than the others.By comparing the assessment results in 1990 and 2000,it is discovered that the ecological environ-ment in Daning River Watershed in 1990 was better than that in 2000.展开更多
本文对6例乙型肝炎病人(4例急性肝炎,1例慢性迁延性肝炎,1例 HBsAg 阳性携带者)的血清进行了 Dane 抗体的研究。采用双抗体沉淀法,系将被检血清与氚标记 Dane 颗粒作用沉淀后,加入抗入 Ig 血清再沉淀,以上清液中残留放射性作为 Dane 抗...本文对6例乙型肝炎病人(4例急性肝炎,1例慢性迁延性肝炎,1例 HBsAg 阳性携带者)的血清进行了 Dane 抗体的研究。采用双抗体沉淀法,系将被检血清与氚标记 Dane 颗粒作用沉淀后,加入抗入 Ig 血清再沉淀,以上清液中残留放射性作为 Dane 抗体活性的指标。检测结果有2例急性乙肝病人血清中测出 Dane 抗体。这一抗体不同于抗-HBs、抗-HBc 或抗-HBe。根据临床随访,2例 Dane 抗体阳性者中一例恢复较快,并以后出现抗-HBs,另一例恢复不甚显著,血清中 HBsAg、HBeAg 均为阳性。作者认为进一步明确 Dane 抗体在清除血循环中乙肝病毒的作用,对研究慢性乙型肝炎发病机制有一定帮助.展开更多
基金Supported by the Key Project of the National Natural Science Foundation of China(Grant Nos.30590383 and 90411015)the National Natural Science Foundation of China(Grant No.40601104)+5 种基金the Scientific Research Foundation for the Returned Overseas Chinese Scholars,Ministry of Education of Chinathe Doctoral Program of Higher Education of China(Grant No.20050284011)the Foundation of ImportantBasic Research at Nanjing University(Grant No.0209005206)the Open Foundation of the State Key Laboratory of Loess and Quaternary Geology from the Institute of Earth EnvironmentChinese Academy of Sciences(Grant No.SKLLQG0503),thePhysical Geography of"985"Itemsthe Test Foundation of Modern AnalysesCenter of Nanjing University(Grant No.0209001309)
文摘Environmental archaeology of archaeological sites on both sides of the Dachang section in the Daning River,the Three Gorges of the Yangtze River,shows that riverbed evolution has a great influence on the distribution of archaeological sites during the prehistorical and historical period,and it restricts human activity and the development of ancient culture.Field investigation,dating data,paleocurrent analysis of 100 gravels on the riverbed and archaeological excavation reveal that the riverbed of the Dachang section developed in the Shuangyantang region during the early stage,after about 30 kaBP it shifted westward gradually and reached the present place.Along with the westward shift,the focus of ancient culture changed for several times.In the Western Zhou Dynasty's period,the east riverbank of the Daning River was the main residential area.During the Han Dynasty,along with the westward shift,the living space of ancient people was no longer confined to the east riverbank and the focus of culture moved westward.Then the Zhangjiawan site became the main dwelling district.In the late Han Dynasty, the villages were flooded and the ancients had to immigrate to a high place.Tombs of the Han and the Jin Dynasties outcropped on the flood plain of the east bank because their surface sediments were eroded by several flood events and the westward shift of the riverbed.
基金This paper was supported by the Major State Basic Research Program of China(973)(No.2003CB415204).
文摘Based on Remote Sensing(RS),Geographical Information Systems(GIS),and the Spatial Principal Compo-nent Analysis(SPCA)method,the integrated assessment and changes in the ecological environment of Daning River Watershed are studied in this paper.The watershed is located in the Three Gorge Area in China.The result of the integrated assessment showed that level 9 had the biggest proportion in the year 1990,which was about 40%.In the year 2000,however,there were no levels with a proportion significantly bigger than the others.By comparing the assessment results in 1990 and 2000,it is discovered that the ecological environ-ment in Daning River Watershed in 1990 was better than that in 2000.
文摘本文对6例乙型肝炎病人(4例急性肝炎,1例慢性迁延性肝炎,1例 HBsAg 阳性携带者)的血清进行了 Dane 抗体的研究。采用双抗体沉淀法,系将被检血清与氚标记 Dane 颗粒作用沉淀后,加入抗入 Ig 血清再沉淀,以上清液中残留放射性作为 Dane 抗体活性的指标。检测结果有2例急性乙肝病人血清中测出 Dane 抗体。这一抗体不同于抗-HBs、抗-HBc 或抗-HBe。根据临床随访,2例 Dane 抗体阳性者中一例恢复较快,并以后出现抗-HBs,另一例恢复不甚显著,血清中 HBsAg、HBeAg 均为阳性。作者认为进一步明确 Dane 抗体在清除血循环中乙肝病毒的作用,对研究慢性乙型肝炎发病机制有一定帮助.
