Surface observations and CHAMP measurement data are employed to develop a three-dimensional surface spline(3DSS)model of China's Mainland.The magnetic field distribution at the satellite level is then demonstrated...Surface observations and CHAMP measurement data are employed to develop a three-dimensional surface spline(3DSS)model of China's Mainland.The magnetic field distribution at the satellite level is then demonstrated using the model obtained.The results of this model are compared and verifi ed by deriving the corresponding two(2DTY)and threedimensional(3DTY)Taylor polynomial models.Issues such as the removal of disruptive geomagnetic fi elds,the data gap between the surface and satellite levels,and boundary eff ects are carefully considered during modeling.We then focus on evaluating the modeling eff ect of the satellite data.Ten satellite points not involved in the modeling procedure are selected,and the residuals,absolute change rates,and RMSEs of these points are calculated.Results show that the distribution of the magnetic fi eld determined by the 3DSS model is highly consistent with that obtained from the IGRF12 model.Expect for component Y,the absolute change rates of other components are less than 0.5%.Specifi cally,the RMSE of Y of 3DSS is nearly 60%lower than those of 3DTY and 2DTY;the RMSE of other components of the former are also over 90%lower than those of the latter.This fi nding implies that the 3DSS model has good performance for modeling satellite data and its results are reliable.Moreover,the modeling eff ect of 3DTY is better than that of 2DTY.展开更多
目的:探讨全髋关节置换术的CroweⅢ-Ⅳ型发育性髋关节发育不良(developmental dysplasia of the hip,DDH)患者的满意度及造成不满意的相关因素。方法:回顾性分析2013年3月至2018年3月行全髋关节置换术的169例CroweⅢ-Ⅳ型DDH患者,通过...目的:探讨全髋关节置换术的CroweⅢ-Ⅳ型发育性髋关节发育不良(developmental dysplasia of the hip,DDH)患者的满意度及造成不满意的相关因素。方法:回顾性分析2013年3月至2018年3月行全髋关节置换术的169例CroweⅢ-Ⅳ型DDH患者,通过微信进行调查问卷,调查患者对手术总体满意度、10项日常功能满意度和患者认为对自己日常生活影响比较大的前5个问题。手术前后采用髋关节Harris评分进行功能评价。结果:收到完整调查问卷145份,所有患者获随访,时间1~5(3.23±1.22)年。145例患者分成两组,其中对手术疗效满意的118例,不满意的27例,手术总体满意率81.38%(118/145)。患者认为对生活影响比较大的前5个问题分别是术后髋部疼痛,肢体明显不等长、行走、上下楼梯、蹲起。两组术前Harris评分比较,差异无统计学意义(P>0.05),不满意组术后Harris评分较低。术后髋关节疼痛、肢体不等长是影响手术不满意的直接因素。结论:采用全髋关节置换术治疗CroweⅢ-Ⅳ型DDH患者手术难度大;术后髋关节疼痛(轻度以上),肢体不等长(>2 cm)是术后不满意的独立危险因素。展开更多
基金This work was supported by the National Natural Science Foundation of China(Nos.41974073,41404053)Special Project for Meteo-Scientifi c Research in the Public Interest(No.GYHY201306073)。
文摘Surface observations and CHAMP measurement data are employed to develop a three-dimensional surface spline(3DSS)model of China's Mainland.The magnetic field distribution at the satellite level is then demonstrated using the model obtained.The results of this model are compared and verifi ed by deriving the corresponding two(2DTY)and threedimensional(3DTY)Taylor polynomial models.Issues such as the removal of disruptive geomagnetic fi elds,the data gap between the surface and satellite levels,and boundary eff ects are carefully considered during modeling.We then focus on evaluating the modeling eff ect of the satellite data.Ten satellite points not involved in the modeling procedure are selected,and the residuals,absolute change rates,and RMSEs of these points are calculated.Results show that the distribution of the magnetic fi eld determined by the 3DSS model is highly consistent with that obtained from the IGRF12 model.Expect for component Y,the absolute change rates of other components are less than 0.5%.Specifi cally,the RMSE of Y of 3DSS is nearly 60%lower than those of 3DTY and 2DTY;the RMSE of other components of the former are also over 90%lower than those of the latter.This fi nding implies that the 3DSS model has good performance for modeling satellite data and its results are reliable.Moreover,the modeling eff ect of 3DTY is better than that of 2DTY.
文摘目的:探讨全髋关节置换术的CroweⅢ-Ⅳ型发育性髋关节发育不良(developmental dysplasia of the hip,DDH)患者的满意度及造成不满意的相关因素。方法:回顾性分析2013年3月至2018年3月行全髋关节置换术的169例CroweⅢ-Ⅳ型DDH患者,通过微信进行调查问卷,调查患者对手术总体满意度、10项日常功能满意度和患者认为对自己日常生活影响比较大的前5个问题。手术前后采用髋关节Harris评分进行功能评价。结果:收到完整调查问卷145份,所有患者获随访,时间1~5(3.23±1.22)年。145例患者分成两组,其中对手术疗效满意的118例,不满意的27例,手术总体满意率81.38%(118/145)。患者认为对生活影响比较大的前5个问题分别是术后髋部疼痛,肢体明显不等长、行走、上下楼梯、蹲起。两组术前Harris评分比较,差异无统计学意义(P>0.05),不满意组术后Harris评分较低。术后髋关节疼痛、肢体不等长是影响手术不满意的直接因素。结论:采用全髋关节置换术治疗CroweⅢ-Ⅳ型DDH患者手术难度大;术后髋关节疼痛(轻度以上),肢体不等长(>2 cm)是术后不满意的独立危险因素。
