The environmental ecology of the Yangtze River Economic Zone(YREZ)faces ecological function decline,deterioration and degradation under intense human activities,long-term development and utilization and its economy ha...The environmental ecology of the Yangtze River Economic Zone(YREZ)faces ecological function decline,deterioration and degradation under intense human activities,long-term development and utilization and its economy has developed rapidly over recent decades.Eco-efficiency is considered as a measure of coordinated development of economy,resources,environment and ecology,and is currently considered a very important issue.In this paper,based on the slack-based measure and data envelope analysis model,we take 129 prefecture-level cities of the YREZ as the study unit and measure the eco-efficiency of the YREZ in 2000,2005,2010 and 2015,which considers undesired output.The evaluation of the status quo of the regional eco-efficiency development was carried out at provincial,prefectural and city scales.The spatial autocorrelation test model and standard deviation ellipse were used to analyze the spatially distributed characteristics and the evolutionary regularity of eco-efficiency.Our study suggested that the eco-efficiency value varied significantly at different spatiotemporal scales and the overall distribution presented an"N-shaped"pattern,the value is the largest downstream and the smallest upstream.Regional eco-efficiency presented certain volatility in growth and a clear spatial positive agglomeration trend from 2000 to 2015.The spatial distribution of each agglomeration area was also significantly different,forming some high-high agglomeration areas at the center of the shaft with Shanghai and surrounding cities,and some low-low agglomeration areas at the center with middle reaches and upstream cities.The low-high over-aggregation and high-low polarization clusters were fewer.At the same time,with the change of the research period,the degree of positive agglomeration became increasingly pronounced and the eco-efficiency gap of the neighborhoodunit reduced.The regional eco-efficiency value of the YREZ presented a spatial distribution pattern in the northeast-southwest axis and the evolutionary pattern of the regional eco-efficiency similarly showed a northeast-southwest orientation.展开更多
Air pollution is one of the top environmental concerns and causes of deaths and variousdiseases worldwide. In this paper, PM2.5 observation data at 1,497 automatic air quality-monitoringstations in 367 cities of China...Air pollution is one of the top environmental concerns and causes of deaths and variousdiseases worldwide. In this paper, PM2.5 observation data at 1,497 automatic air quality-monitoringstations in 367 cities of China in 2015 were utilized, and the study on spatiotemporal distribution of PM2.5concentration found that the average annual concentration of PM2.5 in urban China in 2015 was 49.74 μg/m3and exceeded the annual average limit in 287 cities. PM2.5 concentrations were highest in winter and lowestin summer in most cities, but it reached the highest in spring in the cities around Taklimakan Desert. Therewere 320 fi ne days in 2015 and the maximum PM2.5 was prone to appear at night, the minimum was usuallyin the afternoon, but in the early morning in Lhasa, and the minimum in winter was even in the earlymorning, midday and afternoon in some cities. Higher concentrations of PM2.5 were found in the EastChina Plain and the cities around Taklimakan Desert, preceded by the Yangtze River Delta economic zone,Chengdu-Chongqing economic zone and Harbin-Changchun megalopolis, while the lower values coveredthe northwestern region of Xinjiang, Heilongjiang Xing’an Mountains region, northeast high latitudes ofInner Mongolia, southwest high altitudes in the border area of Sichuan, Yunnan, Qinghai-Tibet Plateau andthe southeast coastal areas.展开更多
目的探讨急性脑梗死患者外周血白细胞、中性粒细胞、淋巴细胞水平对意识障碍程度的评估价值。方法从2018年1~12月在重庆大学附属中心医院住院的急性脑梗死患者中筛选出136例,按入院时格拉斯哥昏迷指数(Glasgow coma scale,GCS)分为意识...目的探讨急性脑梗死患者外周血白细胞、中性粒细胞、淋巴细胞水平对意识障碍程度的评估价值。方法从2018年1~12月在重庆大学附属中心医院住院的急性脑梗死患者中筛选出136例,按入院时格拉斯哥昏迷指数(Glasgow coma scale,GCS)分为意识障碍组(GCS≤14分,n=59)与无意识障碍组(GCS=15分,n=77),比较两组间外周血白细胞绝对值、中性粒细胞绝对值与百分比、淋巴细胞绝对值与百分比、中性粒细胞/淋巴细胞比值,以及常见血管危险因素(年龄、性别、高血压、糖尿病、房颤、高脂血症)的差异。在意识障碍组中分别比较上述外周血指标与GCS评分的关联性。结果意识障碍组外周血白细胞绝对值、中性粒细胞绝对值和百分比、房颤患者比例均显著高于无意识障碍组,而淋巴细胞绝对值和百分比、中性粒细胞/淋巴细胞比值、年龄、性别以及高血压、糖尿病、高脂血症病史差异均无统计学意义。此外,意识障碍组外周血白细胞绝对值、中性粒细胞绝对值和百分比越高,则GCS评分越低,二者呈负相关。运用协方差分析分别校正了房颤以及其他血管危险因素后,以上负相关仍然存在。结论急性脑梗死患者外周血白细胞、中性粒细胞绝对值和百分比升高与意识障碍GCS评分降低密切相关。展开更多
基金The Strategic Priority Research Program of Chinese Academy of Sciences,No.XDA23060704State Key Laboratory of Cryospheric Science,No.SKLCS-ZZ-2020。
文摘The environmental ecology of the Yangtze River Economic Zone(YREZ)faces ecological function decline,deterioration and degradation under intense human activities,long-term development and utilization and its economy has developed rapidly over recent decades.Eco-efficiency is considered as a measure of coordinated development of economy,resources,environment and ecology,and is currently considered a very important issue.In this paper,based on the slack-based measure and data envelope analysis model,we take 129 prefecture-level cities of the YREZ as the study unit and measure the eco-efficiency of the YREZ in 2000,2005,2010 and 2015,which considers undesired output.The evaluation of the status quo of the regional eco-efficiency development was carried out at provincial,prefectural and city scales.The spatial autocorrelation test model and standard deviation ellipse were used to analyze the spatially distributed characteristics and the evolutionary regularity of eco-efficiency.Our study suggested that the eco-efficiency value varied significantly at different spatiotemporal scales and the overall distribution presented an"N-shaped"pattern,the value is the largest downstream and the smallest upstream.Regional eco-efficiency presented certain volatility in growth and a clear spatial positive agglomeration trend from 2000 to 2015.The spatial distribution of each agglomeration area was also significantly different,forming some high-high agglomeration areas at the center of the shaft with Shanghai and surrounding cities,and some low-low agglomeration areas at the center with middle reaches and upstream cities.The low-high over-aggregation and high-low polarization clusters were fewer.At the same time,with the change of the research period,the degree of positive agglomeration became increasingly pronounced and the eco-efficiency gap of the neighborhoodunit reduced.The regional eco-efficiency value of the YREZ presented a spatial distribution pattern in the northeast-southwest axis and the evolutionary pattern of the regional eco-efficiency similarly showed a northeast-southwest orientation.
基金Supported by Guizhou Province Science and Technology Fund(LKT[2012]07,25).
文摘Air pollution is one of the top environmental concerns and causes of deaths and variousdiseases worldwide. In this paper, PM2.5 observation data at 1,497 automatic air quality-monitoringstations in 367 cities of China in 2015 were utilized, and the study on spatiotemporal distribution of PM2.5concentration found that the average annual concentration of PM2.5 in urban China in 2015 was 49.74 μg/m3and exceeded the annual average limit in 287 cities. PM2.5 concentrations were highest in winter and lowestin summer in most cities, but it reached the highest in spring in the cities around Taklimakan Desert. Therewere 320 fi ne days in 2015 and the maximum PM2.5 was prone to appear at night, the minimum was usuallyin the afternoon, but in the early morning in Lhasa, and the minimum in winter was even in the earlymorning, midday and afternoon in some cities. Higher concentrations of PM2.5 were found in the EastChina Plain and the cities around Taklimakan Desert, preceded by the Yangtze River Delta economic zone,Chengdu-Chongqing economic zone and Harbin-Changchun megalopolis, while the lower values coveredthe northwestern region of Xinjiang, Heilongjiang Xing’an Mountains region, northeast high latitudes ofInner Mongolia, southwest high altitudes in the border area of Sichuan, Yunnan, Qinghai-Tibet Plateau andthe southeast coastal areas.
文摘目的探讨急性脑梗死患者外周血白细胞、中性粒细胞、淋巴细胞水平对意识障碍程度的评估价值。方法从2018年1~12月在重庆大学附属中心医院住院的急性脑梗死患者中筛选出136例,按入院时格拉斯哥昏迷指数(Glasgow coma scale,GCS)分为意识障碍组(GCS≤14分,n=59)与无意识障碍组(GCS=15分,n=77),比较两组间外周血白细胞绝对值、中性粒细胞绝对值与百分比、淋巴细胞绝对值与百分比、中性粒细胞/淋巴细胞比值,以及常见血管危险因素(年龄、性别、高血压、糖尿病、房颤、高脂血症)的差异。在意识障碍组中分别比较上述外周血指标与GCS评分的关联性。结果意识障碍组外周血白细胞绝对值、中性粒细胞绝对值和百分比、房颤患者比例均显著高于无意识障碍组,而淋巴细胞绝对值和百分比、中性粒细胞/淋巴细胞比值、年龄、性别以及高血压、糖尿病、高脂血症病史差异均无统计学意义。此外,意识障碍组外周血白细胞绝对值、中性粒细胞绝对值和百分比越高,则GCS评分越低,二者呈负相关。运用协方差分析分别校正了房颤以及其他血管危险因素后,以上负相关仍然存在。结论急性脑梗死患者外周血白细胞、中性粒细胞绝对值和百分比升高与意识障碍GCS评分降低密切相关。
