目的:比较氨甲环酸局部应用与静脉应用在初次单侧全膝关节置换术中的疗效。方法:通过检索PubMed、Cochrane Library、Embase、Web of Science英文数据库获取文献,采用Cochrane推荐的风险偏倚评估工具进行质量评价,采用Revman 5.3软件和S...目的:比较氨甲环酸局部应用与静脉应用在初次单侧全膝关节置换术中的疗效。方法:通过检索PubMed、Cochrane Library、Embase、Web of Science英文数据库获取文献,采用Cochrane推荐的风险偏倚评估工具进行质量评价,采用Revman 5.3软件和Stata 12.0软件对效应指标进行统计分析。结果:共计28篇文献,33组随机对照实验,患者共计3423人,实验组1673人,对照组1750人,2组总出血量(MD=-24.41,95%CI=-63.12~14.30)、引流量(MD=-5.24,95%CI=-42.86~32.38)、血红蛋白下降值(MD=1.73,95%CI=-0.31~3.79)、输血率(MD=1.12,95%CI=0.89~1.42)、血栓相关并发症(MD=0.98,95%CI=0.58~1.65)比较差异均无统计学意义。结论:初次单侧全膝关节置换术中氨甲环酸局部与静脉两种给药方式疗效无差异。展开更多
A thermal model for a heat pipe with axially swallow-tailed microgrooves is developed and analyzed numerically to predict the heat transfer capacity and total thermal resistance.The effect of heat load on the axial di...A thermal model for a heat pipe with axially swallow-tailed microgrooves is developed and analyzed numerically to predict the heat transfer capacity and total thermal resistance.The effect of heat load on the axial distribution of capillary radius,and the effect of working temperature and wick structure on the maximum heat transfer capability,as well as the effect of the heat load and working temperature on the total thermal resistance are all investigated and discussed.It is indicated that the meniscus radius increases non-linearly and slowly at the evaporator and adiabatic section along the axial direction,while increasing drastically at the beginning of the condenser section.The pressure difference in the vapor phase along the axial direction is much smaller than that in the liquid phase.In addition,the heat transfer capacity is deeply affected by the working temperature and the size of the wick.A groove wick structure with a wider groove base width and higher groove depth can enhance the heat transfer capability.The effect of the working temperature on the total thermal resistance is insignificant;however,the total thermal resistance shows dependence upon the heat load.In addition,the accuracy of the model is also verified by the experiment in this paper.展开更多
基金Supported by the 11th Five Year National Science and Technology Support Key Project of China(2008BAJ12B02)
文摘A thermal model for a heat pipe with axially swallow-tailed microgrooves is developed and analyzed numerically to predict the heat transfer capacity and total thermal resistance.The effect of heat load on the axial distribution of capillary radius,and the effect of working temperature and wick structure on the maximum heat transfer capability,as well as the effect of the heat load and working temperature on the total thermal resistance are all investigated and discussed.It is indicated that the meniscus radius increases non-linearly and slowly at the evaporator and adiabatic section along the axial direction,while increasing drastically at the beginning of the condenser section.The pressure difference in the vapor phase along the axial direction is much smaller than that in the liquid phase.In addition,the heat transfer capacity is deeply affected by the working temperature and the size of the wick.A groove wick structure with a wider groove base width and higher groove depth can enhance the heat transfer capability.The effect of the working temperature on the total thermal resistance is insignificant;however,the total thermal resistance shows dependence upon the heat load.In addition,the accuracy of the model is also verified by the experiment in this paper.
