In this study,multilayer lamination welding was employed to prepare graphene/copper(Gr/Cu)composite billets from graphene-coated copper foils,followed by multi-pass cold drawing to produce Φ1 mm Gr/Cu composite wires...In this study,multilayer lamination welding was employed to prepare graphene/copper(Gr/Cu)composite billets from graphene-coated copper foils,followed by multi-pass cold drawing to produce Φ1 mm Gr/Cu composite wires.Microstructure and property analyses in both the cold-drawn and annealed states show that the incorporation of graphene significantly improves the ductility and electrical conductivity of the copper wire.After annealing at 350℃ for 30 minutes,the composite wire demonstrates a tensile strength of 270 MPa and an electrical conductivity of 102.74%IACS,both superior to those of pure copper wire under identical conditions.At 150℃,the electrical conductivity of the annealed composite wire reaches 72.60%IACS,notably higher than the 68.19%IACS of pure copper.The results suggest that graphene is uniformly distributed within the composite wire,with minimal impact on conductivity,while effectively refining the copper grain structure to enhance ductility.Moreover,graphene suppresses copper lattice vibrations at elevated temperatures,reducing the rate of conductivity degradation.展开更多
[目的]研究健康云管理系统对家庭病床糖尿病病人糖脂代谢和氧化应激的影响。[方法]选取居住于上海市龙华街道社区的家庭病床糖尿病病人160例,随机分为对照组和健康云管理组,每组80例。随访过程中,对照组失访5例,健康云管理失访3例。对...[目的]研究健康云管理系统对家庭病床糖尿病病人糖脂代谢和氧化应激的影响。[方法]选取居住于上海市龙华街道社区的家庭病床糖尿病病人160例,随机分为对照组和健康云管理组,每组80例。随访过程中,对照组失访5例,健康云管理失访3例。对照组进行6个月的常规家庭病床治疗与随访,健康云管理组在对照组的基础上,使用健康云管理系统对病人进行远程的个性化管理。治疗前后使用全自动生化分析仪检测空腹血糖(FBG)、糖化血红蛋白(HbA1c)、总胆固醇(TC)、三酰甘油(TG)、低密度脂蛋白胆固醇(LDL-C)、高密度脂蛋白胆固醇(HDL-C),使用酶联免疫吸附试剂盒检测血清中白细胞介素-1β(IL-1β)、白细胞介素-6(IL-6)、肿瘤坏死因子-α(TNF-α)、C-反应蛋白(CRP)、丙二醛(MDA),使用黄嘌呤氧化酶法检测血清中超氧化物歧化酶(SOD)活性。[结果]治疗后健康云管理组病人FBG、HbA1c、TC、TG、IL-1β、TNF-α、CRP、MDA低于对照组,而HDL-C、SOD高于对照组,两组比较差异均有统计学意义( P <0.05)。[结论]健康云管理系统可以改善家庭病床糖尿病病人的糖脂代谢紊乱,降低氧化应激水平。展开更多
基金Funded by Hunan Provincial Natural Science Foundation(No.2023JJ40074)Hunan Provincial Education Department Excellent Youth Project(No.21B0757)Hunan Provincial Engineering Technology Center(No.2022TP2036)。
文摘In this study,multilayer lamination welding was employed to prepare graphene/copper(Gr/Cu)composite billets from graphene-coated copper foils,followed by multi-pass cold drawing to produce Φ1 mm Gr/Cu composite wires.Microstructure and property analyses in both the cold-drawn and annealed states show that the incorporation of graphene significantly improves the ductility and electrical conductivity of the copper wire.After annealing at 350℃ for 30 minutes,the composite wire demonstrates a tensile strength of 270 MPa and an electrical conductivity of 102.74%IACS,both superior to those of pure copper wire under identical conditions.At 150℃,the electrical conductivity of the annealed composite wire reaches 72.60%IACS,notably higher than the 68.19%IACS of pure copper.The results suggest that graphene is uniformly distributed within the composite wire,with minimal impact on conductivity,while effectively refining the copper grain structure to enhance ductility.Moreover,graphene suppresses copper lattice vibrations at elevated temperatures,reducing the rate of conductivity degradation.
文摘[目的]研究健康云管理系统对家庭病床糖尿病病人糖脂代谢和氧化应激的影响。[方法]选取居住于上海市龙华街道社区的家庭病床糖尿病病人160例,随机分为对照组和健康云管理组,每组80例。随访过程中,对照组失访5例,健康云管理失访3例。对照组进行6个月的常规家庭病床治疗与随访,健康云管理组在对照组的基础上,使用健康云管理系统对病人进行远程的个性化管理。治疗前后使用全自动生化分析仪检测空腹血糖(FBG)、糖化血红蛋白(HbA1c)、总胆固醇(TC)、三酰甘油(TG)、低密度脂蛋白胆固醇(LDL-C)、高密度脂蛋白胆固醇(HDL-C),使用酶联免疫吸附试剂盒检测血清中白细胞介素-1β(IL-1β)、白细胞介素-6(IL-6)、肿瘤坏死因子-α(TNF-α)、C-反应蛋白(CRP)、丙二醛(MDA),使用黄嘌呤氧化酶法检测血清中超氧化物歧化酶(SOD)活性。[结果]治疗后健康云管理组病人FBG、HbA1c、TC、TG、IL-1β、TNF-α、CRP、MDA低于对照组,而HDL-C、SOD高于对照组,两组比较差异均有统计学意义( P <0.05)。[结论]健康云管理系统可以改善家庭病床糖尿病病人的糖脂代谢紊乱,降低氧化应激水平。
