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The response of sedimentary record to catchment changes induced by human activities in the western intertidal flat of Yalu River Estuary,China
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作者 SHI Yong LIU Zhishuai +2 位作者 GAO Jianhua YANG Yang WANG Yaping 《Acta Oceanologica Sinica》 SCIE CAS CSCD 2017年第4期54-63,共10页
The response to the catchment changes of the sedimentary environment of the western intertidal flat of Yalu River Estuary was investigated by analyzing the vertical variations of the grain size of sediment cores,along... The response to the catchment changes of the sedimentary environment of the western intertidal flat of Yalu River Estuary was investigated by analyzing the vertical variations of the grain size of sediment cores,along with the hydrologic data and human activities in the catchment.The results demonstrated a stepwise decreasing trend for the variations of both the sediment load and water discharge into the sea,which could be divided into three stages as 1958–1970,1971–1990 and 1991–2009.Reservoir construction and the changes of catchment vegetation coverage turned out to be the two predominant contributors to the changes.There are four periods for the variation of the sensitive components of the sediment cores from 1940 to 2010,i.e.,1940–1950,1951–1980,1981–1990 and 1991–2010.The vertical distribution of grain size in the cores mainly varied with the changes of vegetation coverage in the catchment and reservoir construction from 1960 to 1980,whereas it varied depending on the intensity of water and soil erosion in the catchment from 1980 to 1990.Despite the further reduction of the water and sediment input into the sea from 1990 to 2009,this period was characterized by coarsening trends for the grain size of sediment in the estuarine intertidal flat and correspondingly,the significantly increased silt contents of the sensitive component. 展开更多
关键词 runoff and sediment load human activities sediment record sensitive component Yalu River
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A broadband regenerative frequency divider in InGaP/GaAs HBT technology 被引量:1
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作者 张金灿 张玉明 +4 位作者 吕红亮 张义门 刘敏 钟英辉 师政 《Journal of Semiconductors》 EI CAS CSCD 2014年第7期139-142,共4页
A dynamic divide-by-two regenerative GaP/GaAs heterojunction bipolar transistors (HBTs) frequency divider (RFD) is presented in a 60-GHz-fT Intechnology. To achieve high operation bandwidth, active loads instead o... A dynamic divide-by-two regenerative GaP/GaAs heterojunction bipolar transistors (HBTs) frequency divider (RFD) is presented in a 60-GHz-fT Intechnology. To achieve high operation bandwidth, active loads instead of resistor loads are incorporated into the RFD. On-wafer measurement shows that the divider is operating from 10 GHz up to at least 40 GHz, limited by the available input frequency. The maximum operation frequency of the divider is found to be much higher than fT/2 of the transistor, and also the divider has excellent input sensitivity. The divider consumes 300.85 mW from 5 V supply and occupies an area of 0.47 × 0.22 mm^2. 展开更多
关键词 regenerative frequency divider InGaP/GaAs HBT active loads BROADBAND
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