目的:观察桡骨远端骨折经正骨手法复位电子智能夹板和传统夹板固定后,并发症的预防、骨折愈合、腕关节功能恢复情况。方法:将符合诊断标准、纳入标准及排除标准的桡骨远端骨折患者60例,按照就诊时间的先后顺序随机分为电子智能夹板组、...目的:观察桡骨远端骨折经正骨手法复位电子智能夹板和传统夹板固定后,并发症的预防、骨折愈合、腕关节功能恢复情况。方法:将符合诊断标准、纳入标准及排除标准的桡骨远端骨折患者60例,按照就诊时间的先后顺序随机分为电子智能夹板组、传统夹板组各30例。经正骨手法复位电子智能夹板固定和传统夹板固定治疗后观察和随访6个月。疗效对比评价采用Gartland and Werlley的腕关节评分标准,影像学评价从治疗前及治疗6周后尺偏角、掌倾角、桡骨高度3方面进行评价,对术后2周内肿胀、疼痛进行评估。结果:所有患者均随访6个月,根据Gartland and Werlley的腕关节评分标准、肿胀评分(复位后1天、3天、7天、14天)、疼痛评分(复位后3天、7天、14天),电子智能夹板组疗效明显优于传统夹板组(P<0.05)。2组治疗6周后影像指标比较,差异无统计学意义(P>0.05)。结论:电子智能夹板治疗桡骨远端骨折与传统夹板比较,可更有效减轻肿胀、疼痛及预防肢体末端缺血、最大限度恢复腕关节功能。展开更多
Electron beam welding of Ti-15-3 titanium alloy to 304 stainless steel with a copper sheet as interlayer was carried out.Microstructures of the joint were studied by optical microscopy(OM),scanning electron microscopy...Electron beam welding of Ti-15-3 titanium alloy to 304 stainless steel with a copper sheet as interlayer was carried out.Microstructures of the joint were studied by optical microscopy(OM),scanning electron microscopy(SEM) and X-ray diffractometry(XRD).In addition,the mechanical properties of the joint were evaluated by tensile test and the microhardness was measured.These two alloys were successfully welded by adding copper transition layer into the weld.Solid solution with a certain thickness was located at the interfaces between weld and base metal in both sides.Regions inside the weld and near the stainless steel were characterized by solid solution of copper with TiFe2 intermetallics dispersedly distributed in it.While weld near titanium alloy contained Ti-Cu and Ti-Fe-Cu intermetallics layer,in which the hardness of weld came to the highest value.Brittle fracture occurred in the intermetallics layer when the joint was stretched.展开更多
A series of compression tests were conducted to investigate the mechanical properties and failure mechanisms of carbon fiber composite sandwich panels using pyramidal truss cores subjected to temperatures ranging from...A series of compression tests were conducted to investigate the mechanical properties and failure mechanisms of carbon fiber composite sandwich panels using pyramidal truss cores subjected to temperatures ranging from 100℃ to 350℃.The compressive strength and stiffness of sandwich panels decreased as temperature increased.Cryogenic temperatures caused an increase in strength and stiffness,while elevated temperatures resulted in a reduction of strength and stiffness.The effect of temperature on the failure mode of the sandwich panel was revealed as well.The interface between the fiber and matrix was examined by a scanning electron microscope(SEM) in order to study the effect of temperature on strengthening the mechanism and good bonding conditions within the fiber-matrix interface was observed at cryogenic temperatures.The comparison of the predicted and experimental data indicated that the stiffness and strength of the composite sandwich panels for temperature variation was consistent.展开更多
文摘目的:观察桡骨远端骨折经正骨手法复位电子智能夹板和传统夹板固定后,并发症的预防、骨折愈合、腕关节功能恢复情况。方法:将符合诊断标准、纳入标准及排除标准的桡骨远端骨折患者60例,按照就诊时间的先后顺序随机分为电子智能夹板组、传统夹板组各30例。经正骨手法复位电子智能夹板固定和传统夹板固定治疗后观察和随访6个月。疗效对比评价采用Gartland and Werlley的腕关节评分标准,影像学评价从治疗前及治疗6周后尺偏角、掌倾角、桡骨高度3方面进行评价,对术后2周内肿胀、疼痛进行评估。结果:所有患者均随访6个月,根据Gartland and Werlley的腕关节评分标准、肿胀评分(复位后1天、3天、7天、14天)、疼痛评分(复位后3天、7天、14天),电子智能夹板组疗效明显优于传统夹板组(P<0.05)。2组治疗6周后影像指标比较,差异无统计学意义(P>0.05)。结论:电子智能夹板治疗桡骨远端骨折与传统夹板比较,可更有效减轻肿胀、疼痛及预防肢体末端缺血、最大限度恢复腕关节功能。
文摘Electron beam welding of Ti-15-3 titanium alloy to 304 stainless steel with a copper sheet as interlayer was carried out.Microstructures of the joint were studied by optical microscopy(OM),scanning electron microscopy(SEM) and X-ray diffractometry(XRD).In addition,the mechanical properties of the joint were evaluated by tensile test and the microhardness was measured.These two alloys were successfully welded by adding copper transition layer into the weld.Solid solution with a certain thickness was located at the interfaces between weld and base metal in both sides.Regions inside the weld and near the stainless steel were characterized by solid solution of copper with TiFe2 intermetallics dispersedly distributed in it.While weld near titanium alloy contained Ti-Cu and Ti-Fe-Cu intermetallics layer,in which the hardness of weld came to the highest value.Brittle fracture occurred in the intermetallics layer when the joint was stretched.
基金supported by the National Natural Science Foundation of China (Grant Nos. 90816024 and 11272105)the Major State Basic Research Development Program of China (Grant No. 2011CB610303)the Research Fund for the Doctoral Program of Higher Education of China (Grant No. 20092302110006)
文摘A series of compression tests were conducted to investigate the mechanical properties and failure mechanisms of carbon fiber composite sandwich panels using pyramidal truss cores subjected to temperatures ranging from 100℃ to 350℃.The compressive strength and stiffness of sandwich panels decreased as temperature increased.Cryogenic temperatures caused an increase in strength and stiffness,while elevated temperatures resulted in a reduction of strength and stiffness.The effect of temperature on the failure mode of the sandwich panel was revealed as well.The interface between the fiber and matrix was examined by a scanning electron microscope(SEM) in order to study the effect of temperature on strengthening the mechanism and good bonding conditions within the fiber-matrix interface was observed at cryogenic temperatures.The comparison of the predicted and experimental data indicated that the stiffness and strength of the composite sandwich panels for temperature variation was consistent.
