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Ruan's conjecture on singular symplectic flops of mixed type

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Science China Mathematics 2014年第6期57卷 1121-1148页

作者： CHEN BoHui li anmin li XiaoBin ZHAO GuoSong Yangtze Center of Mathematics Department of MathematicsSichuan University Department of Mathematics Southwest Jiaotong University Department of Mathematics Sichuan University

In this paper,we study the global singular symplectic flops related to the following affine hypersurface with cyclic quotient singularities,Vr,b={(x,y,z,t)∈C4|xy-z2r+t2=0}/μr(a,-a,b,0),r 2,where b=1 appears in Mori’s minimal model program and b=1 is a new class of singularities in symplectic birational *** prove that two symplectic 3-orbifolds which are singular flops to each other have isomorphic Ruan cohomology *** proof is based on the symplectic cutting argument and virtual localization technique.

关键词： Ruan's conjecture singular symplectic flops (r b)-orbiconifold singularity Ruan cohomology virtual localization

An Inequality for Matrices and Its Applications in Differential Geometry

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数学进展 1991年第3期 375-376页

作者： li anmin li Jimin(Sichuan University) (Chongqing Architectural Engineering Institute)

For a matrix A=(αij)we denote by N（A）the square of the norm of A,i.6., N（A）=trace A~t A=∑(αij)*** this paper we prove the following inequality. Theorem 1 Let A1,A2,…,Apbe symmetric（n×n）-matrices（p≥2）.We ... 详细信息

关键词： In An Inequality for Matrices and Its Applications in Differential Geometry

Calabi Conjecture on Hyperbolic Affine Hyperspheres

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四川大学学报(自然科学版) 1988年第4期 505-506页

作者： li anmin

The classification of affine complete affine hyperspheres is a fundamental andimportant problem in affine differential *** hyperbolic affine hypersphe-res *** posed *** affine complete hyperbclic affine hypersphere is asymptoticto the boundary of a convex core with vertex at the center;conversely,everypointed,nondegenerate convex cone detern(?)i es an affine hypersphere of hyperbolic

关键词： In Calabi Conjecture on Hyperbolic Affine Hyperspheres

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高熵合金力学性能的研究进展

材料导报 2018年第3期32卷 461-466,472页

作者：李安敏史君佐谢明款广西大学广西有色金属及特色材料加工重点实验室南宁530004 广西大学资源环境与材料学院南宁530004

高熵合金作为一类新型的合金,具有许多优于传统合金的性能,在诸多领域有广阔的应用前景。高熵合金现阶段的研究主要集中在其力学性能方面,它的高强度、高硬度、高耐磨性和耐腐蚀性等优点展现出了其作为在严酷条件下服役的结构材料的潜力... 详细信息

高熵合金作为一类新型的合金,具有许多优于传统合金的性能,在诸多领域有广阔的应用前景。高熵合金现阶段的研究主要集中在其力学性能方面,它的高强度、高硬度、高耐磨性和耐腐蚀性等优点展现出了其作为在严酷条件下服役的结构材料的潜力,但目前对高熵合金的研究仍处于探索性阶段,所以研究高熵合金的力学性能具有重要的现实意义。主要综述了组分、制备工艺、热处理工艺、冷轧等对高熵合金的组织与力学性能的影响,并展望了高熵合金的应用前景。

关键词：高熵合金热处理冷轧力学性能

Towards building a firm metaverse security base

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Security and Safety 2023年第2期2卷 57-71页

作者： anmin li Xiaohui Yao Haiying Gu Yungeng Zhang Yuan Chang China Telecom Research Institute Shanghai 200122China China Telecom Research Institute Beijing 102209China

The Metaverse is a significant field that is currently receiving considerable attention from both the industry and *** transformation of the Metaverse from science fiction to reality is being actively promoted by technology,industry,and ***,the development of the Metaverse is still in its early stages,and the system architecture and theoretical technology of the Metaverse are not yet *** paper provides a comprehensive analysis of the Metaverse and summarizes its holographic,omnipotent,multidimensional,and multifaceted *** development of the Metaverse is founded on the relevant infrastructure,and we elaborate on the primary components of the Metaverse ***,we systematically summarize the security risks inherent in the Metaverse *** on this,we propose utilizing the system security technology concept to guide the construction of a Metaverse security protection system from various perspectives at each level of computing,cloud,network,digital assets,and terminals,in order to construct a secure foundation for addressing the Metaverse’s security risks and challenges.

关键词： Metaverse New infrastructure Security base Highly trusted network Trusted identiry Trusted circulation of data

Explicit Representations of Mimmal Immersions of 2-Spheres into S^(2m)

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Acta Mathematica Sinica,English Series 1997年第2期13卷 175-186页

作者： li Xingxiao (Department of Mathematics,Henan Normal University,Xinxiang 453002,China)li anmin (Department of Mathematics,Sichuan University,Chengdu 610064,China)

For all minimal immersions of the 2-sphere S2 into the unit 2m-sphere S2mwith area 2π[m（m+1）+2],we are able to give an explicit representation by some real *** representation is rather important in the study of minimal 2-spheres in S2mbecause the parameters concerned are independent of each *** examples are given and a classification theorem is also obtained.

关键词： Minimal immersion Holomorphic curve Directrix

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中美房地产投资信托产品比较

学术研究 2005年第3期 28-34页

作者：李安民中国博士后特华科研工作站

本文通过比较研究 2002年以来中国迅速发展的房地产投资信托计划和在美国资本市场中作为重要投资工具的房地产投资信托产品, 总结了中美两国房地产投资信托产品在设立条件、期限和规模、种类和流通机制、收益和波动特性、销售和保管制... 详细信息

本文通过比较研究 2002年以来中国迅速发展的房地产投资信托计划和在美国资本市场中作为重要投资工具的房地产投资信托产品, 总结了中美两国房地产投资信托产品在设立条件、期限和规模、种类和流通机制、收益和波动特性、销售和保管制度等方面的异同, 发现了中美房地产投资信托产品因为监管制度和历史传统不同而产生的强烈的国别特征, 提出了发展中国房地产投资信托的重大意义和方向。

关键词：房地产信托投资产品比较