检索结果-南通市图书馆

Acta Mathematica Sinica,English Series 2017年第2期33卷 210-234页

作者： Jing Hui qiu School of Mathematical Sciences Soochow University Suzhou 215006 P. R. China

By using Gerstewitz functions, we establish a new equilibrium version of Ekeland varia- tional principle, which improves the related results by weakening both the lower boundedness and the lower semi-continuity of the objective bimaps. Applying the new version of Ekeland principle, we obtain some existence theorems on solutions for set-valued vector equilibrium problems, where the most used assumption on compactness of domains is weakened. In the setting of X complete metric spaces （Z, d）, we present an existence result of solutions for set-valued vector equilibrium problems, which only requires that the domain X C Z is countably compact in any Hausdorff topology weaker than that induced by d. When （Z, d） is a Fechet space （i.e., a complete metrizable locally convex space）, our existence result only requires that the domain C Z is weakly compact. Furthermore, in the setting of non-compact domains, we deduce several existence theorems on solutions for set-valued vector equilibrium problems, which extend and improve the related known results.

关键词： Ekeland variational principle set-valued vector equilibrium problem quasi-ordered locally convex space lower semi-continuity lower boundedness

Henig Proper Efficient Points and Generalized Henig Proper Efficient Points

在线全文

学校读者我要写书评

暂无评论

Acta Mathematica Sinica,English Series 2009年第3期25卷 445-454页

作者： Jing Hui qiu Department of Mathematics Suzhou University Suzhou 215006 P. R. China

Applying the theory of locally convex spaces to vector optimization, we investigate the relationship between Henig proper efficient points and generalized Henig proper efficient points. In particular, we obtain a sufficient and necessary condition for generalized Henig proper efficient points to be Henig proper efficient points. From this, we derive several convenient criteria for judging Henig proper efficient points.

关键词： locally convex space base of a cone Henig proper efficient point generalized Henig properefficient point

Self-Healing Polymeric Materials:On a Winding Road to Success

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Polymer Science 2022年第11期40卷 1315-1316页

作者： Ming-qiu Zhang key Laboratory for Polymeric Composite and Functional Materials of Ministry of Education GD HPPC LabSchool of ChemistrySun Yat-Sen UniversityChina

Self-healing represents a next-generation technology in response to the common demands of polymeric materials for long-term stability and *** mimics the capability of naturally occurring species like living organisms to autonomously recover nonfatal *** damages inevitably generated during fabrication and service are allowed to be unconsciously repaired on a microscopic scale,and would no longer develop into macroscopic failures like the case of conventional materials.

关键词： durability Wind autonomous

Academician Qi-Yi Xing(Chi-Yi Hsing):pioneer organic chemist of synthetic insulin

在线全文

学校读者我要写书评

暂无评论

Protein & Cell 2022年第9期13卷 627-630页

作者： Ming-Hua qiu State key Laboratory of Phytochemistry and Plant Resources in West China Kunming Institute of BotanyChinese Academy of ScienceKunming650201China

Qi-Yi Xing(Chi-Yi Hsing,November 24th,1911–November 4th,2002)(Fig.1)was one of the remarkable scientist and educators in *** was a pioneer for Chinese Organic Chemistry development,an Academician of the Chinese Academy of Sciences,and a professor at the College of Chemistry and Molecular Engineering in Peking *** was one of the leaders of the synthetic crystalline bovine insulin project in China and a person of outstanding talent in the teaching of organic *** the occasion of 110th anniversary of the establishment of the chemistry department at Peking University,it is also Professor Xing’s 110th birthday,and we pay tribute to his lifelong commitment to the development of organic chemistry,especially protein synthesis,and his teaching style.

关键词： Academician teaching pioneer

Generalized Gerstewitz's Functions and Vector Variational Principle for-Efficient Solutions in the Sense of Németh

在线全文

学校读者我要写书评

暂无评论

Acta Mathematica Sinica,English Series 2019年第3期35卷 297-320页

作者： Jing Hui qiu School of Mathematical Sciences Soochow University

In this paper, we first generalize Gerstewitz's functions from a single positive vector to a subset of the positive cone. Then, we establish a partial order principle, which is indeed a variant of the pre-order principle [qiu, J. H.: A pre-order principle and set-valued Ekeland variational principle.J. Math. Anal. Appl., 419, 904–937(2014)]. By using the generalized Gerstewitz's functions and the partial order principle, we obtain a vector EVP for-efficient solutions in the sense of N′emeth, which essentially improves the earlier results by completely removing a usual assumption for boundedness of the objective function. From this, we also deduce several special vector EVPs, which improve and generalize the related known results.

关键词： Ekeland variational principle partial order principle -efficient solutions in the sense of N'emeth Gerstewitz's function convex cone

A Revised Pre-Order Principle and Set-Valued Ekeland Variational Principles with Generalized Distances

在线全文

学校读者我要写书评

暂无评论

Acta Mathematica Sinica,English Series 2017年第6期33卷 775-792页

作者： Jing Hui qiu School of Mathematical Sciences Soochow University Suzhou 215006 P. R. China

In my former paper ＂A pre-order principle and set-valued Ekeland variational principle＂（see [J. Math. Anal. Applo, 419, 904 937 （2014）]）, we established a general pre-order principle. From the pre-order principle, we deduced most of the known set-valued Ekeland variational principles （denoted by EVPs） in set containing forms and their improvements. But the pre-order principle could not imply khanh and Quy＇s EVP in [On generalized Ekeland＇s variational principle and equivalent formulations for set-valued mappings, J. Glob. Optim., 49, 381-396 （2011）], where the perturbation contains a weak T-function, a certain type of generalized distances. In this paper, we give a revised version of the pre-order principle. This revised version not only implies the original pre-order principle, but also can be applied to obtain the above khanh and Quy＇s EVP. In particular, we give several new set-valued EVPs, where the perturbations contain convex subsets of the ordering cone and various types of generalized distances.

关键词： Pre-order principle Ekeland variational principle set-valued map perturbation locallyconvex space vector optimization

CALIBRATION AND ASSESSMENT OF MOMENT ACTUATOR

在线全文

学校读者我要写书评

暂无评论

Acta Mechanica Solida Sinica 1999年第1期12卷 91-94页

作者： qiu Shuye qiu Guiming Shantou Univ Dept Phys Shantou Peoples R China

A moment actuator with direct detection of forces is *** frequency re- sponse and moment excitation purity asperformance criteria are proposed. Methods for the perfor- mancecalibration of the actuator are presented. A... 详细信息

关键词： moment actuator performance calibration reciprocity

On Ha's Version of Set-valued Ekeland's Variational Principle

在线全文

学校读者我要写书评

暂无评论

Acta Mathematica Sinica,English Series 2012年第4期28卷 717-726页

作者： Jing Hui qiu School of Mathematic Science Soochow University

By using the concept of cone extensions and Dancs-Hegedus-Medvegyev theorem, Ha [Some variants of the Ekeland variational principle for a set-valued map. J. Optim. Theory Appl., 124, 187-206 （2005）] established a new version of Ekeland＇s variational principle for set-valued maps, which is expressed by the existence of strict approximate minimizer for a set-valued optimization problem. In this paper, we give an improvement of Ha＇s version of set-valued Ekeland＇s variational principle. Our proof is direct and it need not use Dancs-Hegedus-Medvegyev theorem. From the improved Ha＇s version, we deduce a Caristi-kirk＇s fixed point theorem and a Takahashi＇s nonconvex minimization theorem for set-valued maps. Moreover, we prove that the above three theorems are equivalent to each other.

关键词： Ekeland's variational principle set-valued map locally convex space Caristi-kirk's fixedpoint theorem Takahashi's nonconvex minimization theorem

非厄米PT对称多通道光波导体系的调控及动力学

在线全文

学校读者我要写书评

暂无评论

原子与分子物理学报 2025年第1期42卷 108-117页

作者：孙武叶伏秋张光成吉首大学物理与机电工程学院吉首416000

宇称-时间(PARITY-TIME PT)对称光学波导系统中有关PT对称性的调控主要通过周期性变化的复折射率材料来实现.本文中我们给出了一种对于已耦合的双通道波导体系中额外引入周期调制的中性波导操纵PT对称性的构型,通过高频近似将系统转换... 详细信息

宇称-时间(PARITY-TIME PT)对称光学波导系统中有关PT对称性的调控主要通过周期性变化的复折射率材料来实现.本文中我们给出了一种对于已耦合的双通道波导体系中额外引入周期调制的中性波导操纵PT对称性的构型,通过高频近似将系统转换为重整化参数后的等效未调制系统后,发现可以通过额外引入单频周期调制的光波导去调控体系的PT对称性,并且讨论了周期调制的非厄米三通道波导体系的能谱特性.最后通过解析和数值的方法给出了光在非厄米三通道光学波导中的动力学演化.

关键词： PT对称非厄米三通道波导

Enantioselective reductive conjugate alkenylation of α,β-enones with keto alkenyl acetates by nickel catalysis

同方期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

Science China Chemistry 2025年第01期 157-162页

作者： Rong-De He Yun-Lei Luo qiu-Quan Pan Qi-Wei Yao Xing-Zhong Shu State key Laboratory of Applied Organic Chemistry College of Chemistry and Chemical Engineering Lanzhou University

Reactions involving alkenyl acetates offer cost-effective and environmentally friendly routes for alkene synthesis, yet their asymmetric variant remains elusive. Concurrently, asymmetric conjugate alkenylation predominantly centered on nucleophilic addition using alkenyl–M. This manuscript presents an asymmetric reductive conjugate alkenylation reaction involving alkenyl acetates. The method facilitates the enantioselective addition of keto alkenyl groups to α,β-enones, resulting in the formation of unsaturated diketones—a class of useful structural motifs that are challenging to access otherwise. The use of electron-rich Pyroxy ligand is essential for achieving both high reaction efficiency and enantioselectivity.

关键词：