MANUEL Rodriguez-Vereau, 59, a Peruvian with one-quarter Chinese ancestry, arrives at the Guang＇anmen Hospital in Beijing on an early spring morning to study acupuncture therapy.
The three dimensional(3D) microstructures of Al-Bi alloys with different grain refiners(Al-5Ti-B, Al-3B and Al-3Ti) have been studied using synchrotron X-ray microtomography. The relationships between the microstructu...The three dimensional(3D) microstructures of Al-Bi alloys with different grain refiners(Al-5Ti-B, Al-3B and Al-3Ti) have been studied using synchrotron X-ray microtomography. The relationships between the microstructures and the corresponding wear behavior are verified through the friction and wear tests. The worn surfaces of the samples with grain refiners tested under 15 and 60 N loads are analyzed using Scanning Electron Microscopy(SEM). The results indicate that the addition of grain refiners is beneficial to the size and distribution of the Bi-rich particles in Al-Bi alloys. Compared with Al-5Ti-B and Al-3B grain refiners, the Bi-rich particles are more uniformly distributed and spherical with finer size with the addition of Al-3Ti grain refiner. The refinement renders the Al-20wt%Bi alloy refined by Al-3Ti the superior wear resistance with respect to those refined by Al-5Ti-B and Al-3B grain refiners, corresponding to the microstructures with fine and uniformly distributed Bi-rich particles in the Al matrix.展开更多
Fine-grained visual parsing, including fine-grained part segmentation and fine-grained object recognition, has attracted considerable critical attention due to its importance in many real-world applications, e.g., agr...Fine-grained visual parsing, including fine-grained part segmentation and fine-grained object recognition, has attracted considerable critical attention due to its importance in many real-world applications, e.g., agriculture, remote sensing, and space technologies. Predominant research efforts tackle these fine-grained sub-tasks following different paradigms, while the inherent relations between these tasks are neglected. Moreover, given most of the research remains fragmented, we conduct an in-depth study of the advanced work from a new perspective of learning the part relationship. In this perspective, we first consolidate recent research and benchmark syntheses with new taxonomies. Based on this consolidation, we revisit the universal challenges in fine-grained part segmentation and recognition tasks and propose new solutions by part relationship learning for these important challenges. Furthermore, we conclude several promising lines of research in fine-grained visual parsing for future research.展开更多
l Ti B中间合金是一种高效实用的铝合金晶粒细化剂。本文指出了Al Ti B的潜力、不足和发展趋势。概述了Al Ti B结构遗传的化学和物理基础及影响因素 ,Al Ti B细化行为的结构遗传效应 ,TiAl3 在铝熔体结构遗传中的动力学行为 ,α Al的形...l Ti B中间合金是一种高效实用的铝合金晶粒细化剂。本文指出了Al Ti B的潜力、不足和发展趋势。概述了Al Ti B结构遗传的化学和物理基础及影响因素 ,Al Ti B细化行为的结构遗传效应 ,TiAl3 在铝熔体结构遗传中的动力学行为 ,α Al的形核机制。提出了新的Al Ti B制备技术和微细化处理工艺。认为随着Al Ti B质量的不断改进 ,尤其是高效洁净稳定型Al Ti B的出现 ,Al Ti展开更多
文摘MANUEL Rodriguez-Vereau, 59, a Peruvian with one-quarter Chinese ancestry, arrives at the Guang＇anmen Hospital in Beijing on an early spring morning to study acupuncture therapy.
基金supported by the National Natural Science Foundation of China(Grant Nos.51274054,U1332115,51271042,51375070 and 51401044)the Key Grant Project of Chinese Ministry of Education(Grant No.313011)+1 种基金the Science and Technology Planning Project of Dalian(Grant No.2013A16GX110)the Fundamental Research Funds for the Central Universities
文摘The three dimensional(3D) microstructures of Al-Bi alloys with different grain refiners(Al-5Ti-B, Al-3B and Al-3Ti) have been studied using synchrotron X-ray microtomography. The relationships between the microstructures and the corresponding wear behavior are verified through the friction and wear tests. The worn surfaces of the samples with grain refiners tested under 15 and 60 N loads are analyzed using Scanning Electron Microscopy(SEM). The results indicate that the addition of grain refiners is beneficial to the size and distribution of the Bi-rich particles in Al-Bi alloys. Compared with Al-5Ti-B and Al-3B grain refiners, the Bi-rich particles are more uniformly distributed and spherical with finer size with the addition of Al-3Ti grain refiner. The refinement renders the Al-20wt%Bi alloy refined by Al-3Ti the superior wear resistance with respect to those refined by Al-5Ti-B and Al-3B grain refiners, corresponding to the microstructures with fine and uniformly distributed Bi-rich particles in the Al matrix.
基金supported in part by National Natural Science Foundation of China(Nos.62132002,61825101 and 62202010)the Key-Area Research and Development Program of Guangdong Province,China(No.2021B0101400002)the China Postdoctoral Science Foundation(No.2022M710212).
文摘Fine-grained visual parsing, including fine-grained part segmentation and fine-grained object recognition, has attracted considerable critical attention due to its importance in many real-world applications, e.g., agriculture, remote sensing, and space technologies. Predominant research efforts tackle these fine-grained sub-tasks following different paradigms, while the inherent relations between these tasks are neglected. Moreover, given most of the research remains fragmented, we conduct an in-depth study of the advanced work from a new perspective of learning the part relationship. In this perspective, we first consolidate recent research and benchmark syntheses with new taxonomies. Based on this consolidation, we revisit the universal challenges in fine-grained part segmentation and recognition tasks and propose new solutions by part relationship learning for these important challenges. Furthermore, we conclude several promising lines of research in fine-grained visual parsing for future research.
文摘l Ti B中间合金是一种高效实用的铝合金晶粒细化剂。本文指出了Al Ti B的潜力、不足和发展趋势。概述了Al Ti B结构遗传的化学和物理基础及影响因素 ,Al Ti B细化行为的结构遗传效应 ,TiAl3 在铝熔体结构遗传中的动力学行为 ,α Al的形核机制。提出了新的Al Ti B制备技术和微细化处理工艺。认为随着Al Ti B质量的不断改进 ,尤其是高效洁净稳定型Al Ti B的出现 ,Al Ti
