目的探讨空气波压力治疗仪对健康者下肢深静脉血流动力学的影响,从中筛选促进下肢静脉血液回流的最佳治疗压力并分析作用效果持续时间。方法选取2015年5月至2016年2月在合肥市第二人民医院康复医学科实习的20名健康实习生为研究对象,利...目的探讨空气波压力治疗仪对健康者下肢深静脉血流动力学的影响,从中筛选促进下肢静脉血液回流的最佳治疗压力并分析作用效果持续时间。方法选取2015年5月至2016年2月在合肥市第二人民医院康复医学科实习的20名健康实习生为研究对象,利用彩色多普勒超声检测20名对象左下肢股总静脉在使用4组不同治疗压力(40、60、80、100 mm Hg)的空气波压力治疗仪干预下,不同时间段股总静脉血流峰速度、血流平均速度及血流量。结果干预后4组血流峰速度、平均速度、血流量较静息状态下显著增高(P<0.05)。然而随着时间的延长,4组血流动力学指标逐渐恢复到静息水平。4组静息状态下血流峰速度、血流平均速度及血流量比较差异无统计学意义(P>0.05);干预结束后40 min内4组间血流动力学指标比较差异有统计学意义(P<0.05),60 min时4组间比较差异无统计学意义(P>0.05)。结论空气波压力治疗仪治疗压力为80 mm Hg时促进静脉回流的效果最佳,作用效果可持续40 min,可以考虑作为今后临床康复治疗中使用空气波压力治疗仪参数选择的参考条件之一。展开更多
In order to enhance external hardness and strength, a large-scale hydraulic gate track should go through heat treatment. The current design method of hydraulic gate wheels and tracks is based on Hertz contact linear e...In order to enhance external hardness and strength, a large-scale hydraulic gate track should go through heat treatment. The current design method of hydraulic gate wheels and tracks is based on Hertz contact linear elastic theory, and does not take into account the changes in mechanical properties of materials caused by heat treatment. In this study, the heat treatment parameters were designed and analyzed according to the bearing mechanisms of the wheel and track. The quenching process of the track was simulated by the ANSYS program, and the temperature variation, residual stress, and deformation were obtained and analyzed. The metallurgical structure field after heat treatment was predicted by the method based on time-temperatuxe-transformation （TTT） curves. The results show that the analysis method and designed track heat treatment process are feasible, and can provide a reference for practical projects.展开更多
文摘目的探讨空气波压力治疗仪对健康者下肢深静脉血流动力学的影响,从中筛选促进下肢静脉血液回流的最佳治疗压力并分析作用效果持续时间。方法选取2015年5月至2016年2月在合肥市第二人民医院康复医学科实习的20名健康实习生为研究对象,利用彩色多普勒超声检测20名对象左下肢股总静脉在使用4组不同治疗压力(40、60、80、100 mm Hg)的空气波压力治疗仪干预下,不同时间段股总静脉血流峰速度、血流平均速度及血流量。结果干预后4组血流峰速度、平均速度、血流量较静息状态下显著增高(P<0.05)。然而随着时间的延长,4组血流动力学指标逐渐恢复到静息水平。4组静息状态下血流峰速度、血流平均速度及血流量比较差异无统计学意义(P>0.05);干预结束后40 min内4组间血流动力学指标比较差异有统计学意义(P<0.05),60 min时4组间比较差异无统计学意义(P>0.05)。结论空气波压力治疗仪治疗压力为80 mm Hg时促进静脉回流的效果最佳,作用效果可持续40 min,可以考虑作为今后临床康复治疗中使用空气波压力治疗仪参数选择的参考条件之一。
基金supported by the National Natural Science Foundation of China(Grant No.50979031)
文摘In order to enhance external hardness and strength, a large-scale hydraulic gate track should go through heat treatment. The current design method of hydraulic gate wheels and tracks is based on Hertz contact linear elastic theory, and does not take into account the changes in mechanical properties of materials caused by heat treatment. In this study, the heat treatment parameters were designed and analyzed according to the bearing mechanisms of the wheel and track. The quenching process of the track was simulated by the ANSYS program, and the temperature variation, residual stress, and deformation were obtained and analyzed. The metallurgical structure field after heat treatment was predicted by the method based on time-temperatuxe-transformation （TTT） curves. The results show that the analysis method and designed track heat treatment process are feasible, and can provide a reference for practical projects.
