Urban faults in Shenzhen are potential threats to city security and sustainable development. In consideration of the importance of the Shenzhen fault zone, the author provide a detailed interpretation on gravity data ...Urban faults in Shenzhen are potential threats to city security and sustainable development. In consideration of the importance of the Shenzhen fault zone, the author provide a detailed interpretation on gravity data model. Bouguer gravity covering the whole Shenzhen City was calculated with a 1-km resolution. Wavelet multi-scale analysis（MSA） was applied to the Bouguer gravity data to obtain the multilayer residual anomalies corresponding to different depths. In addition, 2D gravity models were constructed along three profiles. The Bouguer gravity anomaly shows an NE-striking high-low-high pattern from northwest to southeast, strongly related to the main faults. According to the results of MSA, the correlation between gravity anomaly and faults is particularly significant from 4 to 12 km depth. The residual gravity with small amplitude in each layer indicates weak tectonic activity in the crust. In the upper layers, positive anomalies along most of faults reveal the upwelling of high-density materials during the past tectonic movements. The multilayer residual anomalies also yield important information about the faults, such as the vertical extension and the dip direction. The maximum depth of the faults is about 20 km. In general, NE-striking faults extend deeper than NW-striking faults and have a larger dip angle.展开更多
Summary What is already known about this topic?Acrylamide(AA)is toxic and potentially carcinogenic and could be formed during the cooking process.It is understood that almost all foods cooked at high temperature conta...Summary What is already known about this topic?Acrylamide(AA)is toxic and potentially carcinogenic and could be formed during the cooking process.It is understood that almost all foods cooked at high temperature contain AA,especially fried foods.The exposure of AA in food threatens human health.What is added by this report?In the Sixth China Total Diet Study(TDS),AA was detected in 73.3%samples of the 12 food categories with the concentrations ranging from undetected to 176.90μg/kg.The average dietary intake of AA was 0.175μg/kg body weight per day and a significant decrease(45.1%)was observed compared with the Fifth China TDS.Among the 12 food categories,vegetables(59.0%),cereals(18.9%),and potatoes(10.1%)were the main contributors to AA exposure at 88.0%.What are the implications for public health practice?This study highlighted the need to continuously monitor dietary acrylamide exposure in China,including changing food processing methods and making reasonable selection of foodstuffs in the daily diet.展开更多
基金supported by the National Natural Science Foundation of China (Nos.41504015,41429401)the National 973 Project of China (No.2013CB733302)+2 种基金 China Postdoctoral Science Foundation (No.2015M572146)the National High Technology Research and Development Program of China (No.2011AA060503)the Surveying and Mapping Basic Research Program of National Administration of Surveying,Mapping and Geoinformation (No.15-01-08)
文摘Urban faults in Shenzhen are potential threats to city security and sustainable development. In consideration of the importance of the Shenzhen fault zone, the author provide a detailed interpretation on gravity data model. Bouguer gravity covering the whole Shenzhen City was calculated with a 1-km resolution. Wavelet multi-scale analysis（MSA） was applied to the Bouguer gravity data to obtain the multilayer residual anomalies corresponding to different depths. In addition, 2D gravity models were constructed along three profiles. The Bouguer gravity anomaly shows an NE-striking high-low-high pattern from northwest to southeast, strongly related to the main faults. According to the results of MSA, the correlation between gravity anomaly and faults is particularly significant from 4 to 12 km depth. The residual gravity with small amplitude in each layer indicates weak tectonic activity in the crust. In the upper layers, positive anomalies along most of faults reveal the upwelling of high-density materials during the past tectonic movements. The multilayer residual anomalies also yield important information about the faults, such as the vertical extension and the dip direction. The maximum depth of the faults is about 20 km. In general, NE-striking faults extend deeper than NW-striking faults and have a larger dip angle.
基金Supported by the National Key Research and Development Program of China(NO.2017YFC 1600500)CAMS Innovation Fund for Medical Science(CIFMS 2019-I2M-5-024).
文摘Summary What is already known about this topic?Acrylamide(AA)is toxic and potentially carcinogenic and could be formed during the cooking process.It is understood that almost all foods cooked at high temperature contain AA,especially fried foods.The exposure of AA in food threatens human health.What is added by this report?In the Sixth China Total Diet Study(TDS),AA was detected in 73.3%samples of the 12 food categories with the concentrations ranging from undetected to 176.90μg/kg.The average dietary intake of AA was 0.175μg/kg body weight per day and a significant decrease(45.1%)was observed compared with the Fifth China TDS.Among the 12 food categories,vegetables(59.0%),cereals(18.9%),and potatoes(10.1%)were the main contributors to AA exposure at 88.0%.What are the implications for public health practice?This study highlighted the need to continuously monitor dietary acrylamide exposure in China,including changing food processing methods and making reasonable selection of foodstuffs in the daily diet.
