检索结果-南通市图书馆

Congruence Permutable Symmetric Extended de Morgan Algebras

在线全文

学校读者我要写书评

暂无评论

Acta Mathematica Sinica,English Series 2006年第3期22卷 659-664页

作者： jie fang Department of Mathematics Shantou University

An algebra A is said to be congruence permutable if any two congruences on it are permutable. This property has been investigated in several varieties of algebras, for example, de Morgan algebras, p-algebras, Kn,0-algebras. In this paper, we study the class of symmetric extended de Morgan algebras that are congruence permutable. In particular we consider the case where A is finite, and show that A is congruence permutable if and only if it is isomorphic to a direct product of finitely many simple algebras.

关键词： congruence permutable extended Ockham algebra symmetric extended de Morgan algebra

An Extended Ockham Algebra with Endomorphism Kernel Property

在线全文

学校读者我要写书评

暂无评论

Acta Mathematica Sinica,English Series 2007年第9期23卷 1611-1620页

作者： jie fang Department of Mathematics Shantou University Shantou 515063 P. R. China

An algebraic structure A is said to have the endomorphism kernel property if every congruence on A, other than the universal congruence, is the kernel of an endomorphism on A. In this paper, we consider the EKP （that is, endomorphism kernel property） for an extended Ockham algebra A. In particular, we describe the structure of the finite symmetric extended de Morgan algebras having EKP.

关键词： endomorphism kernel extended Ockham algebra symmetric extended de Morgan algebra

Congruences on Balanced Pseudocomplemented Ockham Algebras

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6期25卷 1031-1040页

作者： jie fang School of Computer Sciences Guangdong Polytechnic Normal UniversityGuangzhou 510665 P. R. China

The variety bpO consists of those algebras （L; ∧,∨, f,＊） of type 〈2,2,1, 1,0,0〉 where （L; ∧,∨, f, 0, 1） is an Ockham algebra, （L; ∧,∨, ＊, 0, 1） is a p-algebra, and the operations x → f（x） and x → x^＊ satisfy the identities f（x^＊） = x^＊＊ and [f（x）]^＊ = f^2（x）. In this note, we show that the compact congruences on a bpO-algebra form a dual Stone lattice. Using this, we characterize the algebras in which every principal congruence is complemented. We also give a description of congruence coherent bpO-algebras.

关键词： pseudocomplemented algebra Ockham algebra subdirectly irreducible

Multiple Soliton Solutions of the Dispersive Long-Wave Equations

在线全文

学校读者我要写书评

暂无评论

Chinese Physics Letters 1999年第1期16卷 4-5页

作者： ZHANG jie-fang Research Centre of Engineering Science Zhejiang University of TechnologyHangzhou 310032 Department of Physics Institute of Nonlinear PhysicsZhejiang Normal UniversityJinhua 321004

Using a simple homogeneous balance method,which is very concise and primary,we find the multiple soliton solutions of the dispersive long-wave *** method can be generalized to deal with the higher dimensional dispersi... 详细信息

关键词： equation. equations. dispersive

On Endomorphism Monoids of Finite Kleene Algebras

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Algebra Colloquium 2019年第3期26卷 507-518页

作者： jie fang Zhongju Sun School of Mathematics and System Science Guangdong Polytechnic Normal University Guangzhou 510665China

An endomorphism monoid of an algebra *** said to be a band if every endomorphism on A is an idempotent,and it is said to be a demi-band if every noninject ive endomorphism on A is an *** precisely determine finite Kle... 详细信息

关键词： endomorphism monoid band Kleene algebra

Finite Abelian Groups with the Strong Endomorphism Kernel Property

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Acta Mathematica Sinica,English Series 2020年第9期36卷 1076-1082页

作者： jie fang Zhong Ju SUN School of Mathematics and Systems Science Guangdong Polytechnic Normal UniversityGuangzhou 510665P.R.China

An endomorphism h of a group G is said to be strong whenever for every congruenceθon G,(x,y)∈θimplies(h(x),h(y))∈θfor every x,y∈G.A group G is said to have the strong endomorphism kernel property if every congruence on G is the kernel of a strong *** this note,we study the strong endomorphism kernel property in the class of Abelian *** particular,we show that a finite Abelian group has the strong endomorphism kernel property if and only if it is cyclic.

关键词： Strong endomorphism kernel property congruence Abelian group cyclic group

A Subclass of Ockham Algebras

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10期28卷 2115-2128页

作者： jie fang Zhong Ju SUN School of Computer Science Guangdong Polytechnic Normal University

Here we introduce a subclass of the class of Ockham algebras （L; f） for which L satisfies the property that for every x ∈ L, there exists n 〉 0 such that fn（x） and f^n＋1（x） are complementary. We characterize the structure of the lattice of congruences on such an algebra （L; f）. We show that the lattice of compact congruences on L is a dual Stone lattice, and in particular, that the lattice Con L of congruences on L is boolean if and only if L is finite boolean. We also show that L is congruence coherent if and only if it is boolean. Finally, we give a sufficient and necessary condition to have the subdirectly irreducible chains.

关键词： Boolean algebra Ockham algebra congruence congruence coherence subdirectly irre-ducible

Study on pressure wave propagation in two-phase flow in liquid oxygen feed pipe between pumps

在线全文

学校读者我要写书评

暂无评论

航空动力学报 2010年第10期25卷 2352-2357页

作者： WEI Xin SUN Bing fang jie School of Astronautics Beijing University of Aeronautics and Astronautics Beijing 100191 China

A study on the character of pressure wave propagation was proposed for the gas liquid oxygen two-phase flow in the pipe between *** to the practical working conditions,the homogenous model based on the compressibility theory regarding a single bubble in an infinite liquid,and Redlich-Kwong gas equation was derived a model for the low temperature and high pressure case,especially considering the change of the ratio of density of gas to one of *** numerical tests were *** results not only show the agreement between numerical simulation for this model and experiment at the normal temperature and pressure is good,but also show that the modifications of the model for the low temperature and high pressure condition are *** study is of reference to further study of oscillation restrain and relative pipe tests.

关键词： two-phase flow pressure wave pipe between pumps phase velocity attenuation

Optimal design of vibration absorber using minimax criterion with simplified constraints

在线全文

学校读者我要写书评

暂无评论

Acta Mechanica Sinica 2012年第3期28卷 848-853页

作者： jie fang Shi-Min Wang Qi Wang School of Aeronautics Science and Engineering Beihang University100191 BeijingChina

In this paper, a minimax design of damped dynamic vibration absorber for a damped primary system is investigated to minimize the vibration magnitude peaks. Moreover, to reduce the sensitivity of the primary system response to variations of the forcing frequency for a two- degree-of-freedom system, the primary system should have two equal resonance magnitude peaks. To meet this re- quirement, a set of simplified constraint equations includ- ing distribution characteristics of the resonant frequencies of the primary system is established for the minimax objective function. The modified constraint equations have less un- known variables than those by other authors, which not only simplifies the computation but also improves the accuracy of the optimal values. The advantage of the proposed method is illustrated through numerical simulations.

关键词： Minimax Optimization Dynamic vibrationabsorber (DVA) Sensitivity