Asthma is a common chronic inflammatory disorder that is more prevalent in children than in adults.China has seen an increasing prevalence of childhood asthma in recentdecades[1].Earlier studies have shown that air pa...Asthma is a common chronic inflammatory disorder that is more prevalent in children than in adults.China has seen an increasing prevalence of childhood asthma in recentdecades[1].Earlier studies have shown that air particulate matter (PM),particularly fine particulate matter(PM2.5)[2],is an important factor triggering childhood asthma. Since nationalPM2.5data were nota vailabl euntil 2013,展开更多
From children to teenagers and then to adults,individuals’emotional expression ability has undergone significant changes.From the compulsory education stage to the general senior middle school stage,students’cogniti...From children to teenagers and then to adults,individuals’emotional expression ability has undergone significant changes.From the compulsory education stage to the general senior middle school stage,students’cognitive and emotional needs will change greatly.Students of different school stages show significant differences in their vocal emotional expression,which not only affects their social skills but also has important guiding significance for educational practice.Therefore,this study focuses on the vocal emotional expression of students at different school stages.This study explores the differences in vocal emotional expression among students at different school stages(primary school,junior high school,and senior high school),with a focus on the expression characteristics of different emotional types and the situation of inconsistent internal and external emotions.The research results show that in terms of emotional types,students at different school stages have a relatively high accuracy rate in expressing sadness,while the accuracy rate for expressing anger is the lowest,and the accuracy rate for expressing anger is significantly lower than that for other emotions.In terms of school stages,the overall accuracy of emotional expression among students improves with the increase of school stages,but the differences between school stages are not significant.In the task of expressing inconsistent internal and external emotions,the study found that senior high school students have significantly better emotional conversion ability than primary and junior high school students,indicating that as the school stage increases,students’adaptability in complex emotional expression tasks gradually improves.展开更多
China's requisition-compensation balance strategy has dramatically reshaped cropland spatial patterns,drawing multidisciplinary research attention.However,existing studies predominantly emphasize horizontal distri...China's requisition-compensation balance strategy has dramatically reshaped cropland spatial patterns,drawing multidisciplinary research attention.However,existing studies predominantly emphasize horizontal distribution,overlooking the significant influence of slope gradient on cropland spatial patterns.This paper proposes a slope location quotient(SLQ)index that reflects the relative advantage of cropland distribution and explores the slope grade difference of cropland spatial patterns in China at the county scale.The analysis adopts 30-m resolution digital elevation model with land cover data,taking 2672 counties with cropland ratio>1%as study units.The temporal scope covers 1990 and 2020,with slope gradients categorized into five grades:0°~2°,2°~6°,6°~15°,15°~25°,and 25°~90°.Results show that:1)The inverse correlation between cropland area and slope gradient remained stable throughout the study period,with the variation in cropland area frequency across slope grades being less than 1%.2)The spatial patterns of SLQ in 1990 and 2020 both transited stepwise with slope gradient,while≤2°and>6°slopes exhibited opposing patterns.3)The mean absolute variation of SLQ during 1990-2020 increased with slope gradient(R2=0.926,p<0.01).Particularly for slope grades>15°,the mean absolute variation reached 0.26(for 15°~25°)and 0.43(for 25°~90°),respectively,and displayed a distinct southward-increasing and northwarddecreasing pattern.This study offers novel slopegradient perspectives for analyzing cropland spatial patterns.To enhance cropland protection benefits,reversing the steep cropland SLQ surge in southern China is recommended.展开更多
基金supported by the Development Foundation of Shanghai Meteorological and Health Key Laboratory [QXJK201606]the Investigation of Science&Technology Basic Resources Program of China [2017FY101206]the General Program Foundation of Hebei Meteorological Bureau [17KY10]
文摘Asthma is a common chronic inflammatory disorder that is more prevalent in children than in adults.China has seen an increasing prevalence of childhood asthma in recentdecades[1].Earlier studies have shown that air particulate matter (PM),particularly fine particulate matter(PM2.5)[2],is an important factor triggering childhood asthma. Since nationalPM2.5data were nota vailabl euntil 2013,
文摘From children to teenagers and then to adults,individuals’emotional expression ability has undergone significant changes.From the compulsory education stage to the general senior middle school stage,students’cognitive and emotional needs will change greatly.Students of different school stages show significant differences in their vocal emotional expression,which not only affects their social skills but also has important guiding significance for educational practice.Therefore,this study focuses on the vocal emotional expression of students at different school stages.This study explores the differences in vocal emotional expression among students at different school stages(primary school,junior high school,and senior high school),with a focus on the expression characteristics of different emotional types and the situation of inconsistent internal and external emotions.The research results show that in terms of emotional types,students at different school stages have a relatively high accuracy rate in expressing sadness,while the accuracy rate for expressing anger is the lowest,and the accuracy rate for expressing anger is significantly lower than that for other emotions.In terms of school stages,the overall accuracy of emotional expression among students improves with the increase of school stages,but the differences between school stages are not significant.In the task of expressing inconsistent internal and external emotions,the study found that senior high school students have significantly better emotional conversion ability than primary and junior high school students,indicating that as the school stage increases,students’adaptability in complex emotional expression tasks gradually improves.
基金supported by the project of the National Natural Science Foundation of China entitled“Distribution and change characteristics of construction land on slope gradient in mountainous cities of southern China”(No.41961039)。
文摘China's requisition-compensation balance strategy has dramatically reshaped cropland spatial patterns,drawing multidisciplinary research attention.However,existing studies predominantly emphasize horizontal distribution,overlooking the significant influence of slope gradient on cropland spatial patterns.This paper proposes a slope location quotient(SLQ)index that reflects the relative advantage of cropland distribution and explores the slope grade difference of cropland spatial patterns in China at the county scale.The analysis adopts 30-m resolution digital elevation model with land cover data,taking 2672 counties with cropland ratio>1%as study units.The temporal scope covers 1990 and 2020,with slope gradients categorized into five grades:0°~2°,2°~6°,6°~15°,15°~25°,and 25°~90°.Results show that:1)The inverse correlation between cropland area and slope gradient remained stable throughout the study period,with the variation in cropland area frequency across slope grades being less than 1%.2)The spatial patterns of SLQ in 1990 and 2020 both transited stepwise with slope gradient,while≤2°and>6°slopes exhibited opposing patterns.3)The mean absolute variation of SLQ during 1990-2020 increased with slope gradient(R2=0.926,p<0.01).Particularly for slope grades>15°,the mean absolute variation reached 0.26(for 15°~25°)and 0.43(for 25°~90°),respectively,and displayed a distinct southward-increasing and northwarddecreasing pattern.This study offers novel slopegradient perspectives for analyzing cropland spatial patterns.To enhance cropland protection benefits,reversing the steep cropland SLQ surge in southern China is recommended.
