Equal channel angular pressing （ECAP） processing and annealing were applied to the AZ31 magnesium alloy sheets to evaluate the potential improvement in the mechanical properties and formability. The ECAP experiment ...Equal channel angular pressing （ECAP） processing and annealing were applied to the AZ31 magnesium alloy sheets to evaluate the potential improvement in the mechanical properties and formability. The ECAP experiment was conducted at 300 ℃ in a die having an included angle of 90o between two channels by the BCZ route with the sheets rotated by 90°about the normal axis of plate plane. The tensile tests and conical cup tests were conducted at various temperatures from 20 to 250 ℃. The experimental results indicated that improving the working temperatures could lead to the soft in the material and the enhancement of ductility. Comparatively, the ECAPed AZ31 alloy sheets showed the lower yield strength and smaller conical cup value （CCV） than the unECAPed counterpart in the room temperature. The difference in yield strength between them became small in the elevated temperature, but the ECAPed samples still had the smaller CCV value, implying the improved formability. The texture of the AZ31 alloy sheets could be modified by ECAP and the decrease in the yield strength and more uniform deformation realized in the material, so the formability of AZ31 alloy sheets was improved.展开更多
The FLTRP(Foreign Language Teaching and Research Press)Cup English Public Speaking Contest is one of the major nationwide English competitions for Chinese learners as well as a hot spot for extracurricular activities ...The FLTRP(Foreign Language Teaching and Research Press)Cup English Public Speaking Contest is one of the major nationwide English competitions for Chinese learners as well as a hot spot for extracurricular activities among Chinese colleges.The prepared speech has always been of great significance to all participants in that its survivors will qualify for the next round and gain a chance of making it to the final summit round.This essay intends to interpret the topic of the prepared speech“The Stones,______”by tracing the origin of“stones”,analyzing relevant key words with an intent to advise rhetorical strategies on speech writing based on the principles of three beauties.展开更多
目的:探讨不使用髋臼杯螺钉辅助固定的非骨水泥压配臼杯在人工全髋关节置换中的应用价值。方法:对2011年1月~2015年1月期间因髋关节疾病在我院行全髋关节置换术的符合入选标准的80例患者进行回顾性分析。其中37例患者采用单纯压配固定(p...目的:探讨不使用髋臼杯螺钉辅助固定的非骨水泥压配臼杯在人工全髋关节置换中的应用价值。方法:对2011年1月~2015年1月期间因髋关节疾病在我院行全髋关节置换术的符合入选标准的80例患者进行回顾性分析。其中37例患者采用单纯压配固定(press-fit group,PG),43例患者采用压配联合髋臼杯螺钉固定(press-fit with screws group,PSG)。详细记录并比较两组患者的手术时间、术中出血量、术后伤口引流量、术前及末次随访时的Harris评分;分析并比较两组患者假体周围骨溶解、假体松动情况。结果:单纯压配固定的患者手术时间、术中出血及术后引流量均小于髋臼杯螺钉辅助压配固定的患者(P<0.05)。末次随访时采用单纯压配固定的患者出现髋臼假体周围骨溶解现象少于采用压配联合髋臼杯螺钉固定,但差异无统计学意义(P>0.05)。两组患者末次随访时均未出现假体周围骨折,假体松动等。两组患者末次随访时Harris评分均提高(P<0.05),两组患者手术前及末次随访时Harris评分间差异无统计学意义(P>0.05)。结论:全髋关节置换术是治疗髋关节疾病的有效手段。对于初次行全髋关节置换的老年患者,采用单纯压配固定更有利。展开更多
文摘Equal channel angular pressing （ECAP） processing and annealing were applied to the AZ31 magnesium alloy sheets to evaluate the potential improvement in the mechanical properties and formability. The ECAP experiment was conducted at 300 ℃ in a die having an included angle of 90o between two channels by the BCZ route with the sheets rotated by 90°about the normal axis of plate plane. The tensile tests and conical cup tests were conducted at various temperatures from 20 to 250 ℃. The experimental results indicated that improving the working temperatures could lead to the soft in the material and the enhancement of ductility. Comparatively, the ECAPed AZ31 alloy sheets showed the lower yield strength and smaller conical cup value （CCV） than the unECAPed counterpart in the room temperature. The difference in yield strength between them became small in the elevated temperature, but the ECAPed samples still had the smaller CCV value, implying the improved formability. The texture of the AZ31 alloy sheets could be modified by ECAP and the decrease in the yield strength and more uniform deformation realized in the material, so the formability of AZ31 alloy sheets was improved.
文摘The FLTRP(Foreign Language Teaching and Research Press)Cup English Public Speaking Contest is one of the major nationwide English competitions for Chinese learners as well as a hot spot for extracurricular activities among Chinese colleges.The prepared speech has always been of great significance to all participants in that its survivors will qualify for the next round and gain a chance of making it to the final summit round.This essay intends to interpret the topic of the prepared speech“The Stones,______”by tracing the origin of“stones”,analyzing relevant key words with an intent to advise rhetorical strategies on speech writing based on the principles of three beauties.
文摘目的:探讨不使用髋臼杯螺钉辅助固定的非骨水泥压配臼杯在人工全髋关节置换中的应用价值。方法:对2011年1月~2015年1月期间因髋关节疾病在我院行全髋关节置换术的符合入选标准的80例患者进行回顾性分析。其中37例患者采用单纯压配固定(press-fit group,PG),43例患者采用压配联合髋臼杯螺钉固定(press-fit with screws group,PSG)。详细记录并比较两组患者的手术时间、术中出血量、术后伤口引流量、术前及末次随访时的Harris评分;分析并比较两组患者假体周围骨溶解、假体松动情况。结果:单纯压配固定的患者手术时间、术中出血及术后引流量均小于髋臼杯螺钉辅助压配固定的患者(P<0.05)。末次随访时采用单纯压配固定的患者出现髋臼假体周围骨溶解现象少于采用压配联合髋臼杯螺钉固定,但差异无统计学意义(P>0.05)。两组患者末次随访时均未出现假体周围骨折,假体松动等。两组患者末次随访时Harris评分均提高(P<0.05),两组患者手术前及末次随访时Harris评分间差异无统计学意义(P>0.05)。结论:全髋关节置换术是治疗髋关节疾病的有效手段。对于初次行全髋关节置换的老年患者,采用单纯压配固定更有利。
