The magnetic properties of Fe_(72.5)Cu_1Nb_2V_2Si_(13.5)B_9 alloy are investigated from an amorphous to a nanocrystalline and complete crystalline state. The sample annealed at 550℃ for 0.5 h shows a homogeneous nano...The magnetic properties of Fe_(72.5)Cu_1Nb_2V_2Si_(13.5)B_9 alloy are investigated from an amorphous to a nanocrystalline and complete crystalline state. The sample annealed at 550℃ for 0.5 h shows a homogeneous nanocrystalline structure and presents excellent soft magnetic properties. When the specimens were annealed at a temperature above 600℃, the magnetic properties are obviously deteriorated because the grain size grows up, exceeding the exchange length.展开更多
目的分析心电图P波特征指标、心房颤动血栓危险度评分(congestive heart failure hypertension age diabete mellitus stroke-vascular disease age sex category,CHA_(2)DS_(2)-VASc)联合血清糖链抗原125(carbohydrate antigen 125,CA1...目的分析心电图P波特征指标、心房颤动血栓危险度评分(congestive heart failure hypertension age diabete mellitus stroke-vascular disease age sex category,CHA_(2)DS_(2)-VASc)联合血清糖链抗原125(carbohydrate antigen 125,CA125)指标对住院心力衰竭患者新发心房颤动的预测价值。方法选取2022年1月至2023年8月在南京市浦口人民医院治疗的235例心力衰竭患者为研究对象,根据患者心房颤动的发生情况将其分为新发心房颤动组和非新发心房颤动组,收集患者的临床资料,对比新发心房颤动组和非新发心房颤动组患者的心电图P波特征指标,包括最小P波时限(minimum P-wave duration,P_(min))、最大P波时限(maximum P-wave duration,P_(max))、V_(1)导联P波终末电势(P terminal force in lead V_(1),PTFV_(1))、CHA_(2)DS_(2)-VASc评分、CA125等指标的差异,应用Pearson相关性分析P_(min),P_(max),PTFV_(1),CHA_(2)DS_(2)-VASc评分,CA125与心力衰竭患者新发心房颤动的相关性,最后通过受试者工作特征(receiver operating characteristic,ROC)及曲线下面积(area under curve,AUC)评价P_(min),P_(max),PTFV_(1),CHA_(2)DS_(2)-VASc评分,CA125对心力衰竭患者新发心房颤动的诊断价值。结果新发心房颤动组患者心电图P波特征指标P_(min)低于非新发心房颤动组患者,而P_(max),PTFV_(1)和CHA_(2)DS_(2)-VASc评分及CA125高于非新发心房颤动组患者[(68.05±9.34)ms/(75.36±10.61)ms、(163.76±14.35)ms/(148.90±12.47)ms、(0.065±0.015)mm/s/(0.059±0.008)mm/s、(3.91±1.52)分/(3.05±1.15)分、(84.62±18.54)U/mL/(71.28±16.34)U/mL];logistic回归分析显示,P_(max),PTFV_(1),CHA_(2)DS_(2)-VASc评分,CA125水平升高和P_(min)降低是新发心房颤动的危险因素(OR=1.059,95%CI:1.021~1.098,P<0.05;OR=1.963,95%CI:1.185~3.250,P<0.05;OR=1.474,95%CI:1.064~2.042,P<0.05;OR=1.049,95%CI:1.016~1.082,P<0.05;OR=-0.051,95%CI:0.913~0.989,P<0.05)。P_(max),PTFV_(1),CHA_(2)DS_(2)-VASc评分及CA125与心力衰竭患者新发心房颤动呈正相关(r=0.374,P<0.001;r=0.334,P<0.001;r=0.302,P<0.001;r=0.288,P<0.001),而P_(min)与心力衰竭患者新发心房颤动呈负相关(r=-0.278,P<0.001)。ROC曲线结果显示,P_(min),P_(max),PTFV_(1),CHA_(2)DS_(2)-VASc评分,CA125联合检测预测心力衰竭患者新发心房颤动的AUC值高于各指标单独检测(0.916/0.687、0.771、0.707、0.671、0.729,P<0.05)。结论心力衰竭住院患者P_(min),P_(max),PTFV_(1),CHA_(2)DS_(2)-VASc评分及CA125水平与心力衰竭住院患者新发心房颤动的发生有较高相关性,且心电图P波特征指标、CHA_(2)DS_(2)-VASc评分和血清CA125联合检测心力衰竭住院患者新发心房颤动的诊断效能优于各指标单独检测。展开更多
Solid-state refrigeration based on the magneto-or mechano-caloric effect,including elasto-and barocaloric in ferroic phase transition materials is promising to replace the current vapor compression refrigeration in co...Solid-state refrigeration based on the magneto-or mechano-caloric effect,including elasto-and barocaloric in ferroic phase transition materials is promising to replace the current vapor compression refrigeration in consideration of environmental-friendliness and energy-saving.However,both high driven field and small thermal changes in all of these caloric materials hinder the development of solid-state refrigeration.Here we report a giant baro-caloric effect near room temperature induced by a low hydrostatic pressure in Co-based Co_(51)Fe_(1) V_(33)Ga_(15) Heusler alloy.The maximum adiabatic temperature change under the applied pressure change ofΔp=0.1-100 MPa can be as high asΔ_(Tad)^(Max)=7.7 K(Δ_(Tad)^(Max)/Δpreaches up to~7.7 K kbar-1),surpassing theΔ_(Tad)^(Max)/Δpvalue reported hitherto in baro-caloric alloys.In addition,the microstructure is also studied by using the electron microscopes.Along with the austenite and martensite,the submicron V-rich particles are precipitated in this alloy,which are believed to account for enhancing mechanical properties.展开更多
[目的]研究术前心电图V1导联P波终末电势值(P terminal force in lead V1,PtfV_(1))和肺功能评分对老年非小细胞肺癌(non-small cell lung cancer,NSCLC)患者术后呼吸衰竭的预测价值。[方法]选取湖南省肿瘤医院2018年9月至2020年12月收...[目的]研究术前心电图V1导联P波终末电势值(P terminal force in lead V1,PtfV_(1))和肺功能评分对老年非小细胞肺癌(non-small cell lung cancer,NSCLC)患者术后呼吸衰竭的预测价值。[方法]选取湖南省肿瘤医院2018年9月至2020年12月收治的116例行手术治疗的老年NSCLC患者为研究对象,术前3 d检测PtfV_(1)水平和肺功能评分。根据术后7 d内是否发生呼吸衰竭分为呼吸衰竭组(24例)和非呼吸衰竭组(92例),比较两组患者PtfV_(1)水平、肺功能评分及其他可能影响因素。采用Logistic回归分析影响老年NSCLC患者术后呼吸衰竭的相关因素。绘制受试者工作特征(receiver operating characteristic curve,ROC)曲线,分析PtfV_(1)水平、肺功能评分对老年NSCLC患者术后呼吸衰竭的预测价值。[结果]Logistic回归分析显示病理分期、术前化疗、PtfV_(1)和肺功能评分均是影响老年NSCLC癌患者术后发生呼吸衰竭的相关因素(P<0.05)。ROC曲线分析显示,PtfV_(1)联合肺功能评分预测老年NSCLC患者术后发生呼吸衰竭的灵敏度、准确率、曲线下面积分别为91.26%、85.97%和0.814,均高于PtfV_(1)(70.31%、68.34%、0.718)、肺功能评分(84.24%、72.64%、0.739)单独预测;但特异度(60.32%)低于PtfV_(1)(85.69%)、肺功能评分(68.39%)单独预测。[结论]PtfV_(1)和肺功能评分是老年NSCLC患者术后发生呼吸衰竭独立危险因素,两者联合检测对老年NSCLC患者术后发生呼吸衰竭具有较高预测价值。展开更多
基金This work is supported by the National Natural Science Foundation of China(No.59671020).
文摘The magnetic properties of Fe_(72.5)Cu_1Nb_2V_2Si_(13.5)B_9 alloy are investigated from an amorphous to a nanocrystalline and complete crystalline state. The sample annealed at 550℃ for 0.5 h shows a homogeneous nanocrystalline structure and presents excellent soft magnetic properties. When the specimens were annealed at a temperature above 600℃, the magnetic properties are obviously deteriorated because the grain size grows up, exceeding the exchange length.
文摘目的分析心电图P波特征指标、心房颤动血栓危险度评分(congestive heart failure hypertension age diabete mellitus stroke-vascular disease age sex category,CHA_(2)DS_(2)-VASc)联合血清糖链抗原125(carbohydrate antigen 125,CA125)指标对住院心力衰竭患者新发心房颤动的预测价值。方法选取2022年1月至2023年8月在南京市浦口人民医院治疗的235例心力衰竭患者为研究对象,根据患者心房颤动的发生情况将其分为新发心房颤动组和非新发心房颤动组,收集患者的临床资料,对比新发心房颤动组和非新发心房颤动组患者的心电图P波特征指标,包括最小P波时限(minimum P-wave duration,P_(min))、最大P波时限(maximum P-wave duration,P_(max))、V_(1)导联P波终末电势(P terminal force in lead V_(1),PTFV_(1))、CHA_(2)DS_(2)-VASc评分、CA125等指标的差异,应用Pearson相关性分析P_(min),P_(max),PTFV_(1),CHA_(2)DS_(2)-VASc评分,CA125与心力衰竭患者新发心房颤动的相关性,最后通过受试者工作特征(receiver operating characteristic,ROC)及曲线下面积(area under curve,AUC)评价P_(min),P_(max),PTFV_(1),CHA_(2)DS_(2)-VASc评分,CA125对心力衰竭患者新发心房颤动的诊断价值。结果新发心房颤动组患者心电图P波特征指标P_(min)低于非新发心房颤动组患者,而P_(max),PTFV_(1)和CHA_(2)DS_(2)-VASc评分及CA125高于非新发心房颤动组患者[(68.05±9.34)ms/(75.36±10.61)ms、(163.76±14.35)ms/(148.90±12.47)ms、(0.065±0.015)mm/s/(0.059±0.008)mm/s、(3.91±1.52)分/(3.05±1.15)分、(84.62±18.54)U/mL/(71.28±16.34)U/mL];logistic回归分析显示,P_(max),PTFV_(1),CHA_(2)DS_(2)-VASc评分,CA125水平升高和P_(min)降低是新发心房颤动的危险因素(OR=1.059,95%CI:1.021~1.098,P<0.05;OR=1.963,95%CI:1.185~3.250,P<0.05;OR=1.474,95%CI:1.064~2.042,P<0.05;OR=1.049,95%CI:1.016~1.082,P<0.05;OR=-0.051,95%CI:0.913~0.989,P<0.05)。P_(max),PTFV_(1),CHA_(2)DS_(2)-VASc评分及CA125与心力衰竭患者新发心房颤动呈正相关(r=0.374,P<0.001;r=0.334,P<0.001;r=0.302,P<0.001;r=0.288,P<0.001),而P_(min)与心力衰竭患者新发心房颤动呈负相关(r=-0.278,P<0.001)。ROC曲线结果显示,P_(min),P_(max),PTFV_(1),CHA_(2)DS_(2)-VASc评分,CA125联合检测预测心力衰竭患者新发心房颤动的AUC值高于各指标单独检测(0.916/0.687、0.771、0.707、0.671、0.729,P<0.05)。结论心力衰竭住院患者P_(min),P_(max),PTFV_(1),CHA_(2)DS_(2)-VASc评分及CA125水平与心力衰竭住院患者新发心房颤动的发生有较高相关性,且心电图P波特征指标、CHA_(2)DS_(2)-VASc评分和血清CA125联合检测心力衰竭住院患者新发心房颤动的诊断效能优于各指标单独检测。
基金financially supported by the Key Project of Natural Science Foundation of Jiangxi Province(Grant No.20192ACB20004)the Major Science and Technology Research and Development Special Funds Project of Jiangxi Province(Grant No.20194ABC28005)+4 种基金the National Natural Science Foundation of China(Grant No.51671097)the Key Research Program of Frontier Sciences Chinese Academy of Sciences(Grant No.ZDBSLY-SC002)the Liaoning Revitalization Talents Program(Grant No.XLYC1807122)the Open Project awarded by National Key Laboratory State Microstructures Physics(Grant No.M32037)the Natural Science Foundation of Guizhou Province(2017-1034)。
文摘Solid-state refrigeration based on the magneto-or mechano-caloric effect,including elasto-and barocaloric in ferroic phase transition materials is promising to replace the current vapor compression refrigeration in consideration of environmental-friendliness and energy-saving.However,both high driven field and small thermal changes in all of these caloric materials hinder the development of solid-state refrigeration.Here we report a giant baro-caloric effect near room temperature induced by a low hydrostatic pressure in Co-based Co_(51)Fe_(1) V_(33)Ga_(15) Heusler alloy.The maximum adiabatic temperature change under the applied pressure change ofΔp=0.1-100 MPa can be as high asΔ_(Tad)^(Max)=7.7 K(Δ_(Tad)^(Max)/Δpreaches up to~7.7 K kbar-1),surpassing theΔ_(Tad)^(Max)/Δpvalue reported hitherto in baro-caloric alloys.In addition,the microstructure is also studied by using the electron microscopes.Along with the austenite and martensite,the submicron V-rich particles are precipitated in this alloy,which are believed to account for enhancing mechanical properties.
文摘[目的]研究术前心电图V1导联P波终末电势值(P terminal force in lead V1,PtfV_(1))和肺功能评分对老年非小细胞肺癌(non-small cell lung cancer,NSCLC)患者术后呼吸衰竭的预测价值。[方法]选取湖南省肿瘤医院2018年9月至2020年12月收治的116例行手术治疗的老年NSCLC患者为研究对象,术前3 d检测PtfV_(1)水平和肺功能评分。根据术后7 d内是否发生呼吸衰竭分为呼吸衰竭组(24例)和非呼吸衰竭组(92例),比较两组患者PtfV_(1)水平、肺功能评分及其他可能影响因素。采用Logistic回归分析影响老年NSCLC患者术后呼吸衰竭的相关因素。绘制受试者工作特征(receiver operating characteristic curve,ROC)曲线,分析PtfV_(1)水平、肺功能评分对老年NSCLC患者术后呼吸衰竭的预测价值。[结果]Logistic回归分析显示病理分期、术前化疗、PtfV_(1)和肺功能评分均是影响老年NSCLC癌患者术后发生呼吸衰竭的相关因素(P<0.05)。ROC曲线分析显示,PtfV_(1)联合肺功能评分预测老年NSCLC患者术后发生呼吸衰竭的灵敏度、准确率、曲线下面积分别为91.26%、85.97%和0.814,均高于PtfV_(1)(70.31%、68.34%、0.718)、肺功能评分(84.24%、72.64%、0.739)单独预测;但特异度(60.32%)低于PtfV_(1)(85.69%)、肺功能评分(68.39%)单独预测。[结论]PtfV_(1)和肺功能评分是老年NSCLC患者术后发生呼吸衰竭独立危险因素,两者联合检测对老年NSCLC患者术后发生呼吸衰竭具有较高预测价值。
