The recrystallization behavior,grain boundary characteristic distribution,and mechanical properties of pure Cu sheets that were subjected to different cold rolling paths,and then annealed at 400°C for 10,30,60,an...The recrystallization behavior,grain boundary characteristic distribution,and mechanical properties of pure Cu sheets that were subjected to different cold rolling paths,and then annealed at 400°C for 10,30,60,and 420 min,were investigated.Different rolling paths changed the grain boundary orientations of cold-rolled copper,causing recrystallized grains to nucleate and grow in an oriented manner.However,the evolution of the texture indicated that cold-rolled copper with different rolling paths did not show an obvious preferred orientation after annealing.The RD-60 specimen exhibited the smallest grain size(6.6μm).The results indicated that the grain size and low-ΣCSL grain boundaries worked together to provide RD-60 samples with appropriate mechanical properties and high plasticity.The yield strength,ultimate tensile strength,and elongation of RD-60 sample were 81 MPa,230 MPa,and 49%,respectively.These results could provide guidance for tuning the microstructures and properties of pure Cu foils,as well as designing fabrication routes for pure Cu foils through processes such as rolling and drawing.展开更多
目的:探讨单侧内直肌后徙术与双侧内直肌后徙术对内斜视青少年视功能、斜视度及眼外肌、血清中胰岛素样生长因子-1(Insulin like growth factor 1,IGF-1)水平的影响。方法:选取笔者医院2020年1月-2022年1月收治的60例急性共同性内斜视(A...目的:探讨单侧内直肌后徙术与双侧内直肌后徙术对内斜视青少年视功能、斜视度及眼外肌、血清中胰岛素样生长因子-1(Insulin like growth factor 1,IGF-1)水平的影响。方法:选取笔者医院2020年1月-2022年1月收治的60例急性共同性内斜视(Adolescent patients with acute concomitant esotropia,AACE)青少年患者作为研究对象,按照随机数字表法分为观察组(30例,采用单侧内直肌后徙术治疗)和对照组(30例,采用双侧内直肌后徙术治疗),术后随访半年。观察两组患者治疗效果、Base-out恢复点参数、视功能、斜视度(N-D值),眼外肌、血清中IGF-1水平。结果:术后6个月,观察组患者正位率高于对照组患者,过矫率低于对照组患者(P<0.05)。术后6个月,观察组患者Base-out恢复点参数与Base-in(BI)恢复点与对照组比较差异无统计学意义(P>0.05)。术后6个月,观察组患者正常视近立体视比例高于对照组患者(P<0.05)。术后6个月,观察组患者斜视度与对照组比较差异无统计学意义(P>0.05)。术后6个月,观察组患者眼外肌、血清中IGF-1水平均高于对照组(P<0.05)。结论:单侧内直肌后徙术与双侧内直肌后徙术相比,其能提升内斜视青少年正位率,改善视功能情况,有利于临床推广。展开更多
The traditional foundry industry has developed rapidly in recently years due to advancements in computer technology. Modifying and designing the feeding system has become more convenient with the help of the casting s...The traditional foundry industry has developed rapidly in recently years due to advancements in computer technology. Modifying and designing the feeding system has become more convenient with the help of the casting software, Inte CAST. A common method of designing a feeding system is to first design the initial systems, run simulations with casting software, analyze the feedback, and then redesign. In this work, genetic, fruit fly, and interior point optimizer(IPOPT) algorithms were introduced to guide the optimal riser design for the feeding system. The results calculated by the three optimal algorithms indicate that the riser volume has a weak relationship with the modulus constraint; while it has a close relationship with the volume constraint. Based on the convergence rate, the fruit fly algorithm was obviously faster than the genetic algorithm. The optimized riser was also applied during casting, and was simulated using Inte CAST. The numerical simulation results reveal that with the same riser volume, the riser optimized by the genetic and fruit fly algorithms has a similar improvement on casting shrinkage. The IPOPT algorithm has the advantage of causing the smallest shrinkage porosities, compared to those of the genetic and fruit fly algorithms, which were almost the same.展开更多
基金financially supported by the National Natural Science Foundation of China(No.52201099)the Scientific Research Starting Foundation of Anhui Polytechnic University,China(No.S022021004)+2 种基金Undergraduate Scientific Research Project of Anhui Polytechnic University,ChinaSchool Level Scientific Research Project of Anhui Polytechnic University,China(No.Xjky2022028)the Open Research Fund of Anhui Key Laboratory of High-Performance Non-ferrous Metal Materials,China(No.YSJS-2023-1)。
文摘The recrystallization behavior,grain boundary characteristic distribution,and mechanical properties of pure Cu sheets that were subjected to different cold rolling paths,and then annealed at 400°C for 10,30,60,and 420 min,were investigated.Different rolling paths changed the grain boundary orientations of cold-rolled copper,causing recrystallized grains to nucleate and grow in an oriented manner.However,the evolution of the texture indicated that cold-rolled copper with different rolling paths did not show an obvious preferred orientation after annealing.The RD-60 specimen exhibited the smallest grain size(6.6μm).The results indicated that the grain size and low-ΣCSL grain boundaries worked together to provide RD-60 samples with appropriate mechanical properties and high plasticity.The yield strength,ultimate tensile strength,and elongation of RD-60 sample were 81 MPa,230 MPa,and 49%,respectively.These results could provide guidance for tuning the microstructures and properties of pure Cu foils,as well as designing fabrication routes for pure Cu foils through processes such as rolling and drawing.
文摘目的:探讨单侧内直肌后徙术与双侧内直肌后徙术对内斜视青少年视功能、斜视度及眼外肌、血清中胰岛素样生长因子-1(Insulin like growth factor 1,IGF-1)水平的影响。方法:选取笔者医院2020年1月-2022年1月收治的60例急性共同性内斜视(Adolescent patients with acute concomitant esotropia,AACE)青少年患者作为研究对象,按照随机数字表法分为观察组(30例,采用单侧内直肌后徙术治疗)和对照组(30例,采用双侧内直肌后徙术治疗),术后随访半年。观察两组患者治疗效果、Base-out恢复点参数、视功能、斜视度(N-D值),眼外肌、血清中IGF-1水平。结果:术后6个月,观察组患者正位率高于对照组患者,过矫率低于对照组患者(P<0.05)。术后6个月,观察组患者Base-out恢复点参数与Base-in(BI)恢复点与对照组比较差异无统计学意义(P>0.05)。术后6个月,观察组患者正常视近立体视比例高于对照组患者(P<0.05)。术后6个月,观察组患者斜视度与对照组比较差异无统计学意义(P>0.05)。术后6个月,观察组患者眼外肌、血清中IGF-1水平均高于对照组(P<0.05)。结论:单侧内直肌后徙术与双侧内直肌后徙术相比,其能提升内斜视青少年正位率,改善视功能情况,有利于临床推广。
基金financially supported by the National Science and Technology Key Projects of Numerical Control(2012ZX04012-011)the State Key Laboratory of Materials Processing and Die&Mold Technology Research Project(2014,2015)
文摘The traditional foundry industry has developed rapidly in recently years due to advancements in computer technology. Modifying and designing the feeding system has become more convenient with the help of the casting software, Inte CAST. A common method of designing a feeding system is to first design the initial systems, run simulations with casting software, analyze the feedback, and then redesign. In this work, genetic, fruit fly, and interior point optimizer(IPOPT) algorithms were introduced to guide the optimal riser design for the feeding system. The results calculated by the three optimal algorithms indicate that the riser volume has a weak relationship with the modulus constraint; while it has a close relationship with the volume constraint. Based on the convergence rate, the fruit fly algorithm was obviously faster than the genetic algorithm. The optimized riser was also applied during casting, and was simulated using Inte CAST. The numerical simulation results reveal that with the same riser volume, the riser optimized by the genetic and fruit fly algorithms has a similar improvement on casting shrinkage. The IPOPT algorithm has the advantage of causing the smallest shrinkage porosities, compared to those of the genetic and fruit fly algorithms, which were almost the same.
