Carbon monoxide(CO)is an impurity gas that can poison the precious metal catalysts of hydrogen fuel cells,so it is necessary to separate CO from hydrogen.In this paper,an isovolumetric impregnation method was develope...Carbon monoxide(CO)is an impurity gas that can poison the precious metal catalysts of hydrogen fuel cells,so it is necessary to separate CO from hydrogen.In this paper,an isovolumetric impregnation method was developed to prepare Cu(I)-supported activated carbon(AC),which is simple and easy to industrialize.The prepared cuprous chloride CuCl/AC adsorbent displayed a high CO adsorption capacity of 82.1 cm^(3)/g and a high CO/H_(2) separation factor of 20 at 20 bar and 298 K.This material can adsorb and remove CO from CO/H_(2) mixed gas(5μL/L CO-balanced H_(2))to less than 0.2μL/L under dynamic flow conditions,and showed excellent regeneration performance.The results show that CuCl/AC is an effective adsorbent for separating trace CO in high-purity hydrogen.展开更多
目的:分析我国股骨头坏死(osteonecrosis of the femoral head,ONFH)的流行病学特点。方法:从中国股骨头坏死数据库(China osteonecrosis of the femoral head database,CONFHD)中导出2016年7月至2018年12月就诊的ONFH患者的病例资料,...目的:分析我国股骨头坏死(osteonecrosis of the femoral head,ONFH)的流行病学特点。方法:从中国股骨头坏死数据库(China osteonecrosis of the femoral head database,CONFHD)中导出2016年7月至2018年12月就诊的ONFH患者的病例资料,提取的资料包括性别、年龄、体质量、身高、职业、籍贯等信息。统计患者的性别、年龄、地区、体质量指数(body mass index,BMI)及劳动强度分布情况。结果:符合要求的ONFH患者共1859例,男1314例、女545例。18~35岁286例,36~55岁930例,56~75岁571例,>75岁72例。男性患者年龄小于女性[(48.24±12.55)岁,(55.48±14.98)岁,t=-10.686,P=0.001]。华中地区529例,华东地区527例,西北地区303例,华北地区220例,华南地区219例,东北地区36例,西南地区25例。体质量过低者(BMI<18.5 kg·m^-2)64例、体质量正常者(18.5 kg·m^-2≤BMI<24.0 kg·m^-2)815例、超重者(24.0 kg·m^-2≤BMI<28.0 kg·m^-2)736例、肥胖者(BMI≥28.0 kg·m^-2)244例,其中超重和肥胖患者占53%。Ⅰ级体力劳动者(文职人员、退休人员、公务员等)362例、Ⅱ级体力劳动者(医生、教师、司机、工程师等)111例、Ⅲ级体力劳动者(电工、清洁工等)15例、Ⅳ级体力劳动者(农民、工人等)998例、其他(自由职业、无业人员)373例,其中Ⅳ级体力劳动者占54%。结论:此次基于CONFHD的调查结果显示,目前我国ONFH患者男性多于女性,男性发病较女性早;超重和肥胖者及从事Ⅳ级体力劳动者所占比例较高;患者主要集中在华中、华东和西北地区。展开更多
基金National Key Research and Development Program of China(Grant No.2019YFB1505000).
文摘Carbon monoxide(CO)is an impurity gas that can poison the precious metal catalysts of hydrogen fuel cells,so it is necessary to separate CO from hydrogen.In this paper,an isovolumetric impregnation method was developed to prepare Cu(I)-supported activated carbon(AC),which is simple and easy to industrialize.The prepared cuprous chloride CuCl/AC adsorbent displayed a high CO adsorption capacity of 82.1 cm^(3)/g and a high CO/H_(2) separation factor of 20 at 20 bar and 298 K.This material can adsorb and remove CO from CO/H_(2) mixed gas(5μL/L CO-balanced H_(2))to less than 0.2μL/L under dynamic flow conditions,and showed excellent regeneration performance.The results show that CuCl/AC is an effective adsorbent for separating trace CO in high-purity hydrogen.
文摘目的:分析我国股骨头坏死(osteonecrosis of the femoral head,ONFH)的流行病学特点。方法:从中国股骨头坏死数据库(China osteonecrosis of the femoral head database,CONFHD)中导出2016年7月至2018年12月就诊的ONFH患者的病例资料,提取的资料包括性别、年龄、体质量、身高、职业、籍贯等信息。统计患者的性别、年龄、地区、体质量指数(body mass index,BMI)及劳动强度分布情况。结果:符合要求的ONFH患者共1859例,男1314例、女545例。18~35岁286例,36~55岁930例,56~75岁571例,>75岁72例。男性患者年龄小于女性[(48.24±12.55)岁,(55.48±14.98)岁,t=-10.686,P=0.001]。华中地区529例,华东地区527例,西北地区303例,华北地区220例,华南地区219例,东北地区36例,西南地区25例。体质量过低者(BMI<18.5 kg·m^-2)64例、体质量正常者(18.5 kg·m^-2≤BMI<24.0 kg·m^-2)815例、超重者(24.0 kg·m^-2≤BMI<28.0 kg·m^-2)736例、肥胖者(BMI≥28.0 kg·m^-2)244例,其中超重和肥胖患者占53%。Ⅰ级体力劳动者(文职人员、退休人员、公务员等)362例、Ⅱ级体力劳动者(医生、教师、司机、工程师等)111例、Ⅲ级体力劳动者(电工、清洁工等)15例、Ⅳ级体力劳动者(农民、工人等)998例、其他(自由职业、无业人员)373例,其中Ⅳ级体力劳动者占54%。结论:此次基于CONFHD的调查结果显示,目前我国ONFH患者男性多于女性,男性发病较女性早;超重和肥胖者及从事Ⅳ级体力劳动者所占比例较高;患者主要集中在华中、华东和西北地区。
