In this paper, the authors generalize the definition of χ 2 distribution and introduce a quasi χ 2 distribution, and then prove several properties of it, find the necessary and sufficient conditions of i...In this paper, the authors generalize the definition of χ 2 distribution and introduce a quasi χ 2 distribution, and then prove several properties of it, find the necessary and sufficient conditions of independence about multivariate normal distributions, matrix normal distributions and two parts of the Wishart distribution.展开更多
Diabetes is a common chronic disease in clinical practice.The current global average prevalence is 2–6%,and more than 90%of patients have type 2 diabetes.Although there is a correlation between independent self-care ...Diabetes is a common chronic disease in clinical practice.The current global average prevalence is 2–6%,and more than 90%of patients have type 2 diabetes.Although there is a correlation between independent self-care and self-management,improving patients’self-care and self-management behaviors can effectively improve patients’quality of life.This study aimed to determine if a significant relationship exists between independent self-care and self-management.This study used a quantitative research design.The inclusion criteria included 198 participants using purposeful sampling.This study adopted a correlational research design to determine the association between self-care readiness(independent variable)and self-management(dependent variable).This study surveyed respondents using a three-part questionnaire,and their scores were recorded using the Demographic Profile Questionnaire,Transition Readiness Assessment Questionnaire(TRAQ),and Diabetes Self-Management Questionnaire(DSQM).The data were analyzed using statistical tools such as frequency,percentage,mean,standard deviation,Pearson R and hypothesis testing.The results showed a correlation between independent self-care and self-management in diabetic patients.These findings indicate that the respondents generally reported moderate to high levels of readiness and self-management,with more variability noted in self-management scores.Overall,the findings suggest that preparedness for independent self-care plays a statistically significant role in influencing self-management,although the strength of this relationship is relatively weak.展开更多
目的探讨2型糖尿病患者血脂异常与血清维生素D水平的相关性。方法选取2021年2月—2023年2月在运城市盐湖区人民医院就诊的2型糖尿病患者396例为研究对象,根据血脂是否异常分为血脂异常组(n=173)和血脂正常组(n=223),收集患者的年龄、性...目的探讨2型糖尿病患者血脂异常与血清维生素D水平的相关性。方法选取2021年2月—2023年2月在运城市盐湖区人民医院就诊的2型糖尿病患者396例为研究对象,根据血脂是否异常分为血脂异常组(n=173)和血脂正常组(n=223),收集患者的年龄、性别、身体质量指数(body mass index,BMI)及血压等基本资料,测量身高及体质量,检测空腹血糖和血清中25-羟基维生素D_(3)的水平,探索患者血脂异常与血清维生素D水平的相关关系。结果2组患者的性别、BMI及血清25-羟基维生素D_(3)水平差异有统计学意义(P<0.05)。logistics回归分析显示,男性、超重或肥胖及血清25-羟基维生素D_(3)水平不足均为2型糖尿病患者发生血脂异常的独立危险因素(均P<0.05)。结论血清25-羟基维生素D_(3)水平不足是2型糖尿病患者发生血脂异常的独立危险因素之一,临床应重视2型糖尿病患者维生素D水平的监测,以利于早期预防和干预血脂异常。展开更多
基于耦合模式比较计划第6阶段(CMIP6)中的全球气候模式的模拟结果,采用考虑模式性能和独立性结合(Climate model Weighting by Independence and Performance,ClimWIP)的加权方案进行中国区域气候的多模式集合预估及不确定性研究。结果...基于耦合模式比较计划第6阶段(CMIP6)中的全球气候模式的模拟结果,采用考虑模式性能和独立性结合(Climate model Weighting by Independence and Performance,ClimWIP)的加权方案进行中国区域气候的多模式集合预估及不确定性研究。结果表明,ClimWIP方案在历史阶段的模拟优于等权重方案,降低了多模式模拟的气候态偏差。温度指数的未来预估不确定性较大的区域主要集中在中国北方和青藏高原,而降水指数主要集中在华北和西北地区。ClimWIP方案的预估不确定性与等权重方案相比有所降低。ClimWIP方案预估的温度指数的增温大值区主要集中在中国北方和青藏高原;降水指数在西北和青藏高原增加最为显著。全球额外0.5℃增暖时,中国区域平均的温度指数变化更强,平均高于全球0.2℃,最低温在东北部分地区的额外增温甚至是全球平均的3倍;总降水额外增加5.2%;强降水额外增加10.5%。全球增暖2℃下,中国大部分区域温度指数较当前气候态增加可能超过1.5℃(概率>50%),在中国北方和青藏高原的部分地区增温超过1.5℃的可能性更大(概率>90%);总降水,强降水和连续干日在西北和华北增加幅度有可能超过10%、25%和-5 d(概率>50%)。展开更多
为更好地理解格点融合实况数据与观测数据的差异和代表性,利用甘肃兰州和武威两地站点的观测数据对中国气象局陆面数据同化系统(CMA Land Data Assimilation System,CLDAS)地面2 m气温融合产品进行检验评估及偏差订正。结果表明:(1)逐...为更好地理解格点融合实况数据与观测数据的差异和代表性,利用甘肃兰州和武威两地站点的观测数据对中国气象局陆面数据同化系统(CMA Land Data Assimilation System,CLDAS)地面2 m气温融合产品进行检验评估及偏差订正。结果表明:(1)逐小时气温和日最低气温融合产品的平均误差总体为负值,较实际气温偏低,且在2500 m以下误差随海拔上升而减小;日最高气温融合产品平均误差在海拔1500 m附近为负值,1500 m以上误差变为正值且随海拔升高而增大;日最高和最低气温误差较逐小时气温误差偏大,但平均误差均在2℃以内。(2)通过近网格点检验,发现逐小时CLDAS气温产品白天与实况相近,夜间较实况偏低0.2℃;日平均气温CLDAS融合产品总体较实况偏低1℃,兰州城区产品偏差相对较小;30℃以上高温天数融合产品与实况分布基本一致,但在兰州城区,CLDAS融合产品的高温天数较观测天数偏少。(3)线性回归法和递减平均法对CLDAS气温融合产品都有一定的订正效果,递减平均法订正效果更优且在高海拔地区订正效果更明显。CLDAS气温实况融合产品在兰州和武威两地能较好地反映气温变化特征,但日最高、最低气温误差较逐小时气温大,且在复杂地形下误差相对较大。展开更多
文摘In this paper, the authors generalize the definition of χ 2 distribution and introduce a quasi χ 2 distribution, and then prove several properties of it, find the necessary and sufficient conditions of independence about multivariate normal distributions, matrix normal distributions and two parts of the Wishart distribution.
文摘Diabetes is a common chronic disease in clinical practice.The current global average prevalence is 2–6%,and more than 90%of patients have type 2 diabetes.Although there is a correlation between independent self-care and self-management,improving patients’self-care and self-management behaviors can effectively improve patients’quality of life.This study aimed to determine if a significant relationship exists between independent self-care and self-management.This study used a quantitative research design.The inclusion criteria included 198 participants using purposeful sampling.This study adopted a correlational research design to determine the association between self-care readiness(independent variable)and self-management(dependent variable).This study surveyed respondents using a three-part questionnaire,and their scores were recorded using the Demographic Profile Questionnaire,Transition Readiness Assessment Questionnaire(TRAQ),and Diabetes Self-Management Questionnaire(DSQM).The data were analyzed using statistical tools such as frequency,percentage,mean,standard deviation,Pearson R and hypothesis testing.The results showed a correlation between independent self-care and self-management in diabetic patients.These findings indicate that the respondents generally reported moderate to high levels of readiness and self-management,with more variability noted in self-management scores.Overall,the findings suggest that preparedness for independent self-care plays a statistically significant role in influencing self-management,although the strength of this relationship is relatively weak.
文摘目的探讨2型糖尿病患者血脂异常与血清维生素D水平的相关性。方法选取2021年2月—2023年2月在运城市盐湖区人民医院就诊的2型糖尿病患者396例为研究对象,根据血脂是否异常分为血脂异常组(n=173)和血脂正常组(n=223),收集患者的年龄、性别、身体质量指数(body mass index,BMI)及血压等基本资料,测量身高及体质量,检测空腹血糖和血清中25-羟基维生素D_(3)的水平,探索患者血脂异常与血清维生素D水平的相关关系。结果2组患者的性别、BMI及血清25-羟基维生素D_(3)水平差异有统计学意义(P<0.05)。logistics回归分析显示,男性、超重或肥胖及血清25-羟基维生素D_(3)水平不足均为2型糖尿病患者发生血脂异常的独立危险因素(均P<0.05)。结论血清25-羟基维生素D_(3)水平不足是2型糖尿病患者发生血脂异常的独立危险因素之一,临床应重视2型糖尿病患者维生素D水平的监测,以利于早期预防和干预血脂异常。
文摘基于耦合模式比较计划第6阶段(CMIP6)中的全球气候模式的模拟结果,采用考虑模式性能和独立性结合(Climate model Weighting by Independence and Performance,ClimWIP)的加权方案进行中国区域气候的多模式集合预估及不确定性研究。结果表明,ClimWIP方案在历史阶段的模拟优于等权重方案,降低了多模式模拟的气候态偏差。温度指数的未来预估不确定性较大的区域主要集中在中国北方和青藏高原,而降水指数主要集中在华北和西北地区。ClimWIP方案的预估不确定性与等权重方案相比有所降低。ClimWIP方案预估的温度指数的增温大值区主要集中在中国北方和青藏高原;降水指数在西北和青藏高原增加最为显著。全球额外0.5℃增暖时,中国区域平均的温度指数变化更强,平均高于全球0.2℃,最低温在东北部分地区的额外增温甚至是全球平均的3倍;总降水额外增加5.2%;强降水额外增加10.5%。全球增暖2℃下,中国大部分区域温度指数较当前气候态增加可能超过1.5℃(概率>50%),在中国北方和青藏高原的部分地区增温超过1.5℃的可能性更大(概率>90%);总降水,强降水和连续干日在西北和华北增加幅度有可能超过10%、25%和-5 d(概率>50%)。
文摘为更好地理解格点融合实况数据与观测数据的差异和代表性,利用甘肃兰州和武威两地站点的观测数据对中国气象局陆面数据同化系统(CMA Land Data Assimilation System,CLDAS)地面2 m气温融合产品进行检验评估及偏差订正。结果表明:(1)逐小时气温和日最低气温融合产品的平均误差总体为负值,较实际气温偏低,且在2500 m以下误差随海拔上升而减小;日最高气温融合产品平均误差在海拔1500 m附近为负值,1500 m以上误差变为正值且随海拔升高而增大;日最高和最低气温误差较逐小时气温误差偏大,但平均误差均在2℃以内。(2)通过近网格点检验,发现逐小时CLDAS气温产品白天与实况相近,夜间较实况偏低0.2℃;日平均气温CLDAS融合产品总体较实况偏低1℃,兰州城区产品偏差相对较小;30℃以上高温天数融合产品与实况分布基本一致,但在兰州城区,CLDAS融合产品的高温天数较观测天数偏少。(3)线性回归法和递减平均法对CLDAS气温融合产品都有一定的订正效果,递减平均法订正效果更优且在高海拔地区订正效果更明显。CLDAS气温实况融合产品在兰州和武威两地能较好地反映气温变化特征,但日最高、最低气温误差较逐小时气温大,且在复杂地形下误差相对较大。
