Based on the panel data of 41 cities in the Yangtze River Delta from 2007 to 2018,this paper empirically tests the impact of digital economy development on urban ecological efficiency in the Yangtze River Delta.The re...Based on the panel data of 41 cities in the Yangtze River Delta from 2007 to 2018,this paper empirically tests the impact of digital economy development on urban ecological efficiency in the Yangtze River Delta.The results show that the development level of digital economy in Yangtze River Delta urban agglomeration is fluctuating and rising;the development of digital economy has a significant positive role in promoting the improvement of urban ecological efficiency;there is significant regional heterogeneity in the promotion of ecological efficiency by digital economy,especially in central cities.展开更多
Anatomical characteristics have been proven useful for extracting climatic signals. To examine the climatic signals recorded by tree-ring cell features in the Changbai Mountains, we measured cell number and cell lumen...Anatomical characteristics have been proven useful for extracting climatic signals. To examine the climatic signals recorded by tree-ring cell features in the Changbai Mountains, we measured cell number and cell lumen diameter, in addition to ring widths, of Korean pine （Pinus koraiensis） tree rings at sites of varied elevation, and we developed chronologies of cell number （CN）, mean lumen diameter （MLD）, maximum lumen diameter （MAXLD） and tree-ring width （TRW）. The chronologies were correlated with climatic factors monthly mean tem- perature and the sum of precipitation. As shown by our analysis, the cell parameter chronologies were suitable for dendroclimatology studies. CN and TRW shared relatively similar climatic signals which differed from MLD and MAXLD, and growth-climate relationships were elevation- dependent, as shown by the following findings： （1） at each elevation, MLD and MAXLD recorded different monthly climatic signals from those recorded by TRW for the same climatic factors; and （2） MLD and MAXLD recorded cli- matic factors that were absent middle elevations. Cell lumen effective archive for improving for this study area. from TRW at lower and diameter proved to be an the climate reconstruction展开更多
Ventilation strategies in patients with severe tracheal stenosis should be tailored to the patient according to the underlying cause and narrowing location.This report is on a case of a 68-year-old male patient,who wa...Ventilation strategies in patients with severe tracheal stenosis should be tailored to the patient according to the underlying cause and narrowing location.This report is on a case of a 68-year-old male patient,who was admitted for radiotherapy because of esophageal cancer and then developed severe stenosis at the cervical trachea.We used venovenous extracorporeal membrane oxygenation to secure the airway and ensure adequate oxygenation.Then urgent endoscopic balloon dilation of airway stenosis was successfully performed under general anesthesia.This case shows that venovenous extracorporeal membrane oxygenation can be used in endoscopic tracheal procedures for patients with severe benign stenosis in the upper-trachea who are unable to tolerate conventional ventilation.展开更多
文摘Based on the panel data of 41 cities in the Yangtze River Delta from 2007 to 2018,this paper empirically tests the impact of digital economy development on urban ecological efficiency in the Yangtze River Delta.The results show that the development level of digital economy in Yangtze River Delta urban agglomeration is fluctuating and rising;the development of digital economy has a significant positive role in promoting the improvement of urban ecological efficiency;there is significant regional heterogeneity in the promotion of ecological efficiency by digital economy,especially in central cities.
基金supported by the National Science-Technology Support Plan Projects(2012BAC19B02)the Beijing Natural Science Foundation Projects(8154046)
文摘Anatomical characteristics have been proven useful for extracting climatic signals. To examine the climatic signals recorded by tree-ring cell features in the Changbai Mountains, we measured cell number and cell lumen diameter, in addition to ring widths, of Korean pine （Pinus koraiensis） tree rings at sites of varied elevation, and we developed chronologies of cell number （CN）, mean lumen diameter （MLD）, maximum lumen diameter （MAXLD） and tree-ring width （TRW）. The chronologies were correlated with climatic factors monthly mean tem- perature and the sum of precipitation. As shown by our analysis, the cell parameter chronologies were suitable for dendroclimatology studies. CN and TRW shared relatively similar climatic signals which differed from MLD and MAXLD, and growth-climate relationships were elevation- dependent, as shown by the following findings： （1） at each elevation, MLD and MAXLD recorded different monthly climatic signals from those recorded by TRW for the same climatic factors; and （2） MLD and MAXLD recorded cli- matic factors that were absent middle elevations. Cell lumen effective archive for improving for this study area. from TRW at lower and diameter proved to be an the climate reconstruction
基金the Science Technology Department of Zhejiang Province(LGF19H010010)the Health and Family Planning Commission of Zhejiang Province(2020KY156).
文摘Ventilation strategies in patients with severe tracheal stenosis should be tailored to the patient according to the underlying cause and narrowing location.This report is on a case of a 68-year-old male patient,who was admitted for radiotherapy because of esophageal cancer and then developed severe stenosis at the cervical trachea.We used venovenous extracorporeal membrane oxygenation to secure the airway and ensure adequate oxygenation.Then urgent endoscopic balloon dilation of airway stenosis was successfully performed under general anesthesia.This case shows that venovenous extracorporeal membrane oxygenation can be used in endoscopic tracheal procedures for patients with severe benign stenosis in the upper-trachea who are unable to tolerate conventional ventilation.
