作者:孙丹蒂
学位名称:硕士
出处:北京理工大学 2009
关键词:微分几何;信息几何;统计流型;标量曲率;测地线;Jacobi场;Differential
作者:肖占魁
学位名称:硕士
出处:北京理工大学 2007
关键词:(半)素环;广义
摘要:\hspace*{\parindent}本文主要研究环与~Banach 代数上的导子理论.\\\hspace*{\parindent}我们主要研究~(半~-)素环上的广义导子与环结构之间的联系, 并将代数方面的结果运用到~Banach代数上, 从而给出非交换~Singer-Wermer 猜想的部分回 ...
作者:李彦博
学位名称:硕士
出处:北京理工大学 2006
关键词:Hecke代数;Specht模;Kazhdan-Lusztig胞腔
摘要:设Hv(Sn)为定义在Z[v,v-1]上的对称群Sn上的Iwahori-Hecke代数,本文将构造Kazhdan-lusztig的胞腔模和Murphy的对偶Specht模之间的显式同构,并且证明在适当的顺序下胞腔模的Kazhdan-Lusztig基和对偶Specht模的标准基之间的过渡矩阵是对角元为 ...
作者:成会文
出处:北京理工大学 2005
摘要:本文主要讨论(半)素环上的导子的性质,广义导子在(半)素环上的作用方式以及(半)素环的结构性质之间的必然联系。 第二章讨论关于素环上的导子的一些基本结论。设R是一个特征不等于2的非交换素环,d是R的一个导子,如果对任意的 ,都有[d(x),x]d(x)=0,那么d=0;而且,当[[d(x),x],d ...
作者:韩栋
出处:北京理工大学 2005
摘要:本文主要研究非交换(半)素环上的导子与广义导子.全文由两部分组成: 第一部分讨论关于非交换素环上导子的一些结论.设R是一个2!-扭自由非交换素环,d和g均为R的Jordan导子. 如果对所有的R中的元素x都有 x^dx-xx^g属于环R的中心,那么d=0且g=0. 设R为一个6!-扭自由非交换素环, ...
作者:Hongye Zhang1 2;Runlai Peng1;Jiaye Zhao3;Chao Fan4;Wei Feng2;Zhanwei Liu2; (1 School of Technology, Beijing Forestry University, Beijing 100083, China. 2 School of Aerospace Engineering, Beijing Institute of Technology, Beijing 100081, China. 3 Institute of Flexible Electronics Technology of THU, Jiaxing 314006, China. 4 Beijing Institute of Spacecraft Environment Engineering, Beijing 100094, China.)
出处:Nanomaterials (Basel, Switzerland) 2022
关键词:TBCs;TGO;real time;strain/stress measurement.
摘要:Thermal barrier coating (TBC) materials play important roles in gas turbine engines to protect the Ni-based superalloys from high-temperature airflow ...
作者:Runjun He;Miao Li;Xiao Han;Wei Feng;Hongye Zhang;Huimin Xie;Zhanwei Liu (1 AECC Beijing Institute of Aeronautical Materials, Beijing 100095, China. 2 School of Technology, Beijing Forestry University, Beijing 100083, China. 3 School of Aerospace Engineering, Beijing Institute of Technology, Beijing 100081, China. 4 AML, Department of Engineering Mechanics, Tsinghua University, Beijing 100084, China.)
出处:Nanomaterials (Basel, Switzerland) 0
关键词:Ni-based single-crystal superalloy;TEM;interface;lattice misfit.
摘要:The interface plays an important role in determining strength and toughness in multiphase systems and the accurate measurement of the interface struct ...
作者:Zhuangzhuang Mao,Wei Feng,Ce Hao,Zhanwei Liu (School of Aerospace Engineering, Beijing Institute of Technology;AECC Commercial Aircraft Engine Co. Ltd.)
出处:Theoretical & Applied Mechanics Letters 2022
关键词:Additive;manufacturing;Laser;engineered;net;shaping;Melt;pool;evolution;Simulation;analysis;Temperature;measurement
摘要:In this work, the evolution of melt pool under single-point and single-line printing in the laser engineered net shaping (LENS) process is analyzed. F ...
作者:Zhuangzhuang Mao1;Wei Feng1;Ce Hao2;Zhanwei Liu1;
出处:Theoretical and Applied Mechanics Letters 2022
关键词:Additive manufacturing;Laser Engineered Net Shaping;Melt pool evolution;Simulation analysis;Temperature measurement
摘要:In this work, the evolution of melt pool under single-point and single-line printing in the Laser Engineered Net Shaping (LENS) process is analyzed. F ...