The Changjiang（Yangtze）is one of the largest rivers in the world.It formed a huge incised valley at its mouth during the Last Glacial Maximum;the incised-valley fill,approximately 80–110 m thick,supplies an importa...The Changjiang（Yangtze）is one of the largest rivers in the world.It formed a huge incised valley at its mouth during the Last Glacial Maximum;the incised-valley fill,approximately 80–110 m thick,supplies an important foundation for the generation of shallow biogenic-gas reservoirs.Two cores and 13 cone penetration tests were used to elaborate the characteristics,formation mechanism,and distribution of the shallow biogenic-gas reservoirs in the study area.The natural gas is mainly composed of CH4（generally[95%）with a δ^13CCH4 and δ^13CCO2 of-75.8 to-67.7% and -34.5 to-6.6%,respectively,and a δDCH4 of-215 to-185%,indicating a biogenic origin by the carbon dioxide reduction pathway.Commercial biogenic gas occurs primarily in the sand bodies of fluvial-channel,floodplain,and paleo-estuary facies with a burial depth of 50–80 m.Gas sources as well as cap beds are gray to yellowish-gray mud of floodplain,paleoestuary,and offshore shallow marine facies.The organic matter in gas sources is dominated by immature type Ⅲ kerogen（gas prone）.The difference in permeability（about4–6 orders of magnitude）between cap beds and reservoirs makes the cap beds effectively prevent the upward escape of gas in the reservoirs.This formation mechanism is consistent with that for the shallow biogenic gas in the late Quaternary Qiantang River incised valley to the south.Therefore,this study should provide further insight into understanding the formation and distribution of shallow biogenic gas in other similar postglacial incised-valley systems.展开更多
Despite the great progress of rural socioeconomic development in the 11 th Five-year Plan period （2006-2010）, China＇s agriculture and countryside are still.lacing the challenges of a crude development pattern, back...Despite the great progress of rural socioeconomic development in the 11 th Five-year Plan period （2006-2010）, China＇s agriculture and countryside are still.lacing the challenges of a crude development pattern, backward rural development and cities＇ weak driving effect on the countryside. In the 12th Five-year Plan period （20I 1-2015）, China should transform the way agriculture grows and operates; promote rural socioeconomic development; improve urban planning and its functions, institutional innovation, and urban/rural integration to lay a solid foundation for building an all-round well- off society.展开更多
English education suffered a setback during the period of 1949-1976.The two decades between1977 and 1996 saw a period of restoration,growth and development.To welcome the arrival of thenew century,English education ha...English education suffered a setback during the period of 1949-1976.The two decades between1977 and 1996 saw a period of restoration,growth and development.To welcome the arrival of thenew century,English education has moved on to the third stage:the period of reform.The paper argues for the need for English education reform,summarizes the work we have been doingsince 1997,lists the problems we have encountered,and gives some suggestions in the concluding remarks.展开更多
This article makes a reinterpretation of Lu Xun's acclaimed prose poetry collection Yecao (Wild grass), written between 1924-27, by reading it in conjunct!on with a rediscovered prototype consisting of seven piece...This article makes a reinterpretation of Lu Xun's acclaimed prose poetry collection Yecao (Wild grass), written between 1924-27, by reading it in conjunct!on with a rediscovered prototype consisting of seven pieces published in Guomin gongbao (The citizen's gazette) between August and September 1919 under the title Ziyan ziyu (Talking to oneself). Lu Xunl baihua prose style had advanced considerably in the interim, but the author discerns a degree of thematic overlap between the two collections, on the basis of which he proposes answers to key questions that have been asked about Yecao since its first publication, concluding that it is still as fresh and avant-garde a collection to readers today as it was nearly one hundred years ago.展开更多
基金supported by the National Natural Science Foundation of China under Grant Numbers 41402092 and 41572112the Natural Science Foundation (Youth Science Fund Project) of Jiangsu Province (BK20140604)the Scholarship under State Scholarship Fund sponsored by the China Scholarship Council (File No. 201506195035)
文摘The Changjiang（Yangtze）is one of the largest rivers in the world.It formed a huge incised valley at its mouth during the Last Glacial Maximum;the incised-valley fill,approximately 80–110 m thick,supplies an important foundation for the generation of shallow biogenic-gas reservoirs.Two cores and 13 cone penetration tests were used to elaborate the characteristics,formation mechanism,and distribution of the shallow biogenic-gas reservoirs in the study area.The natural gas is mainly composed of CH4（generally[95%）with a δ^13CCH4 and δ^13CCO2 of-75.8 to-67.7% and -34.5 to-6.6%,respectively,and a δDCH4 of-215 to-185%,indicating a biogenic origin by the carbon dioxide reduction pathway.Commercial biogenic gas occurs primarily in the sand bodies of fluvial-channel,floodplain,and paleo-estuary facies with a burial depth of 50–80 m.Gas sources as well as cap beds are gray to yellowish-gray mud of floodplain,paleoestuary,and offshore shallow marine facies.The organic matter in gas sources is dominated by immature type Ⅲ kerogen（gas prone）.The difference in permeability（about4–6 orders of magnitude）between cap beds and reservoirs makes the cap beds effectively prevent the upward escape of gas in the reservoirs.This formation mechanism is consistent with that for the shallow biogenic gas in the late Quaternary Qiantang River incised valley to the south.Therefore,this study should provide further insight into understanding the formation and distribution of shallow biogenic gas in other similar postglacial incised-valley systems.
文摘Despite the great progress of rural socioeconomic development in the 11 th Five-year Plan period （2006-2010）, China＇s agriculture and countryside are still.lacing the challenges of a crude development pattern, backward rural development and cities＇ weak driving effect on the countryside. In the 12th Five-year Plan period （20I 1-2015）, China should transform the way agriculture grows and operates; promote rural socioeconomic development; improve urban planning and its functions, institutional innovation, and urban/rural integration to lay a solid foundation for building an all-round well- off society.
文摘English education suffered a setback during the period of 1949-1976.The two decades between1977 and 1996 saw a period of restoration,growth and development.To welcome the arrival of thenew century,English education has moved on to the third stage:the period of reform.The paper argues for the need for English education reform,summarizes the work we have been doingsince 1997,lists the problems we have encountered,and gives some suggestions in the concluding remarks.
文摘This article makes a reinterpretation of Lu Xun's acclaimed prose poetry collection Yecao (Wild grass), written between 1924-27, by reading it in conjunct!on with a rediscovered prototype consisting of seven pieces published in Guomin gongbao (The citizen's gazette) between August and September 1919 under the title Ziyan ziyu (Talking to oneself). Lu Xunl baihua prose style had advanced considerably in the interim, but the author discerns a degree of thematic overlap between the two collections, on the basis of which he proposes answers to key questions that have been asked about Yecao since its first publication, concluding that it is still as fresh and avant-garde a collection to readers today as it was nearly one hundred years ago.
