以多巴胺为碳源,在纳米硅表面包覆炭层,制备了锂离子电池负极用硅/炭复合材料。采用X射线衍射(XRD)、扫描电子显微镜(SEM)、透射电子显微镜(TEM)和锂离子电池性能测试等方法研究不同热处理温度对材料物相组成、结构形貌和电化学性能的...以多巴胺为碳源,在纳米硅表面包覆炭层,制备了锂离子电池负极用硅/炭复合材料。采用X射线衍射(XRD)、扫描电子显微镜(SEM)、透射电子显微镜(TEM)和锂离子电池性能测试等方法研究不同热处理温度对材料物相组成、结构形貌和电化学性能的影响。结果表明,热处理温度越高,材料的结构越利于提高其电化学性能。1 100℃处理的硅/炭复合材料的颗粒呈近球形且炭层更均匀,循环性能也更优异,首次充放电效率高达77.24%,在100 m A·g^(-1)电流密度下充放电循环20次后放电比容量仍有715.4 m A·h·g^(-1)。展开更多
Background This study was designed to analyze three tibial axis reference lines including the anterior tibial cortex （ATC） line, the fibular line （FL）, and the anatomical axis of tibia （AAT） line, to determine w...Background This study was designed to analyze three tibial axis reference lines including the anterior tibial cortex （ATC） line, the fibular line （FL）, and the anatomical axis of tibia （AAT） line, to determine which line most closely parallels the mechanical axis （MA） of the tibia in the sagittal plane. The clinical relevance of the study is that through finding a reliable landmark on the leg, a surgeon may minimize posterior tibial slope measurement errors thereby and improving the technique for assuring proper alignment of total knee arthroplasty.展开更多
Background Proper rotational alignment during total knee arthroplasty （TKA） is important for adequate postoperative patellofemoral and tibiofemoral kinematics,as well as for achieving balanced flexion space at 90...Background Proper rotational alignment during total knee arthroplasty （TKA） is important for adequate postoperative patellofemoral and tibiofemoral kinematics,as well as for achieving balanced flexion space at 90°.The effects of computer navigation-assisted total knee replacement and conventional total knee arthroplasty on rotational alignment,mechanical axis,component position and clinical outcomes were compared.Methods Two methods were used in 82 patients and the rotation of the femoral and tibial components in the transverse plane,the combined rotation of the two components,the mismatch between them,and the mechanical axis of the lower limb were analyzed.All of these parameters were measured from postoperative radiographs and computed tomography images.Functional outcomes were compared at 6 weeks and 6 months postoperatively.Results Significant differences were found between the two techniques （P 〈0.05） in the following parameters：average rotation of the femoral component （（1.51±3.55）° vs.（-0.63±3.04）°）; combined rotation of the femoral and tibial components （2.85±4.07）° vs.（0.28±3.43）°）; and mismatch between the femoral and tibial components （（1.44±4.55）° vs.（-0.43±2.86）°）.Differences in the rotation of the tibial component were not statistically significant.The prevalence of outliers （malalignment 〉±3° intemal/external rotation） of the femoral component （31.7% vs.12.5%） and the tibial component （36.6% vs.15%） were significantly reduced when the navigation system was used （P〈0.05）.In addition,while patients in the navigation group had significantly better mechanical axis and functional outcomes at 6 weeks after surgery （P 〈0.05）,there was no significant difference between the two groups （P 〉0.05） with respect to functional outcomes at 6 months.Conclusion The navigation system exhibited higher accuracy than the conventional technique in the transverse and coronal plane,and provided better early functional outcomes.展开更多
文摘以多巴胺为碳源,在纳米硅表面包覆炭层,制备了锂离子电池负极用硅/炭复合材料。采用X射线衍射(XRD)、扫描电子显微镜(SEM)、透射电子显微镜(TEM)和锂离子电池性能测试等方法研究不同热处理温度对材料物相组成、结构形貌和电化学性能的影响。结果表明,热处理温度越高,材料的结构越利于提高其电化学性能。1 100℃处理的硅/炭复合材料的颗粒呈近球形且炭层更均匀,循环性能也更优异,首次充放电效率高达77.24%,在100 m A·g^(-1)电流密度下充放电循环20次后放电比容量仍有715.4 m A·h·g^(-1)。
文摘Background This study was designed to analyze three tibial axis reference lines including the anterior tibial cortex （ATC） line, the fibular line （FL）, and the anatomical axis of tibia （AAT） line, to determine which line most closely parallels the mechanical axis （MA） of the tibia in the sagittal plane. The clinical relevance of the study is that through finding a reliable landmark on the leg, a surgeon may minimize posterior tibial slope measurement errors thereby and improving the technique for assuring proper alignment of total knee arthroplasty.
文摘Background Proper rotational alignment during total knee arthroplasty （TKA） is important for adequate postoperative patellofemoral and tibiofemoral kinematics,as well as for achieving balanced flexion space at 90°.The effects of computer navigation-assisted total knee replacement and conventional total knee arthroplasty on rotational alignment,mechanical axis,component position and clinical outcomes were compared.Methods Two methods were used in 82 patients and the rotation of the femoral and tibial components in the transverse plane,the combined rotation of the two components,the mismatch between them,and the mechanical axis of the lower limb were analyzed.All of these parameters were measured from postoperative radiographs and computed tomography images.Functional outcomes were compared at 6 weeks and 6 months postoperatively.Results Significant differences were found between the two techniques （P 〈0.05） in the following parameters：average rotation of the femoral component （（1.51±3.55）° vs.（-0.63±3.04）°）; combined rotation of the femoral and tibial components （2.85±4.07）° vs.（0.28±3.43）°）; and mismatch between the femoral and tibial components （（1.44±4.55）° vs.（-0.43±2.86）°）.Differences in the rotation of the tibial component were not statistically significant.The prevalence of outliers （malalignment 〉±3° intemal/external rotation） of the femoral component （31.7% vs.12.5%） and the tibial component （36.6% vs.15%） were significantly reduced when the navigation system was used （P〈0.05）.In addition,while patients in the navigation group had significantly better mechanical axis and functional outcomes at 6 weeks after surgery （P 〈0.05）,there was no significant difference between the two groups （P 〉0.05） with respect to functional outcomes at 6 months.Conclusion The navigation system exhibited higher accuracy than the conventional technique in the transverse and coronal plane,and provided better early functional outcomes.
