Multi-wall carbon nanotubes reinforced Mg-14Li-1Al composite(MWCNTs/Mg-14Li-1Al) was prepared by the processes of electrophoretic deposition, friction stir processing, and cold rolling. The microstructure and mechanic...Multi-wall carbon nanotubes reinforced Mg-14Li-1Al composite(MWCNTs/Mg-14Li-1Al) was prepared by the processes of electrophoretic deposition, friction stir processing, and cold rolling. The microstructure and mechanical properties of the composite were investigated. The results show that, the microhardness of the composite is up to HV 84.4, which is 91.38% higher than that of the as-cast matrix alloy(HV 44.1). The yield strength and ultimate tensile strength of the composite are 259 and 313 MPa, which are 135.45% and 115.86% higher than those of the as-cast matrix alloy, respectively, and a high specific strength of 221.98 k N·m/kg is obtained. In the composite, the MWCNTs serve as nucleation particles during the friction stir processing and cold rolling, causing dynamic recrystallization and grain refinement. Furthermore, MWCNTs hinder the movement of dislocations and transfer the load from the matrix alloy, thus improving the strength.展开更多
文摘目的:探究重度颅脑损伤患者开颅术后视神经鞘直径与颅内压及预后的关系。方法:2018年3月-2019年5月收治重度颅脑损伤患者70例,监测患者颅内压与视神经鞘直径。结果:70例患者平均视神经鞘直径为4.8 mm,引入ICP时间累加值测量范围在0~29.1 k Pa/h。随访后得知,患者GOS-E评分为(4.51±0.32)分,死亡1例,预后良好36例,预后不良34例。预后良好与预后不良患者视神经鞘直径最佳截断值的频次比较,差异有统计学意义(P<0.05);视神经鞘直径与颅内压呈正相关关系。结论:当视神经鞘直径超过4.8 mm,即可对患者颅内压情况与预后进行预防,视神经鞘直径检出频次越多,患者预后效果越不理想。
基金supported by the National Natural Science Foundation of China (Nos. 51871068, 51971071, 52011530025, and U21A2049)the National Key Research and Development Program of China (No. 2021YFE0103200)+1 种基金the Zhejiang Province Key Research and Development Program, China (No. 2021C01086)the Fundamental Research Funds for the Central Universities, China (No. 3072021CFT1010)。
文摘Multi-wall carbon nanotubes reinforced Mg-14Li-1Al composite(MWCNTs/Mg-14Li-1Al) was prepared by the processes of electrophoretic deposition, friction stir processing, and cold rolling. The microstructure and mechanical properties of the composite were investigated. The results show that, the microhardness of the composite is up to HV 84.4, which is 91.38% higher than that of the as-cast matrix alloy(HV 44.1). The yield strength and ultimate tensile strength of the composite are 259 and 313 MPa, which are 135.45% and 115.86% higher than those of the as-cast matrix alloy, respectively, and a high specific strength of 221.98 k N·m/kg is obtained. In the composite, the MWCNTs serve as nucleation particles during the friction stir processing and cold rolling, causing dynamic recrystallization and grain refinement. Furthermore, MWCNTs hinder the movement of dislocations and transfer the load from the matrix alloy, thus improving the strength.
