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MOMENT GENERATING FUNCTIONS OF RANDOM VARIABLES AND ASYMPTOTIC BEHAVIOUR FOR GENERALIZED FELLER OPERATORS

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Journal of Computational Mathematics 2000年第2期18卷 173-182页

作者： Ji-hua Xu Jing-hui Zhao (Department of Mathematics, hubei university, Wuhan 430062, China) 湖北大学湖北武汉 430062

Describes the representation of moment generating function for the S-lambda type random variables. Higher order asymptotic formula for generalized Feller operators; Regular n-r order moment for the random variables.

关键词： generalized Feller operator moment generating function higher order asymptotic formula regular n-r order moment generalized Taylor formula

CUMULATING CENTRAL POLYNOMIALS AND IDENTITIES FOR Mn (Fp)

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Chinese Annals of Mathematics,Series B 1990年第3期11卷 346-348页

作者：常青 Department of Mathematics Hubei University

Analogue of Formanek Central Polynomial, the auther constructs a cumulatingcentrdl polynomlal for M_n(F_p) and a cumulating identity for M_n(F_p).

关键词： constructs answer algebra polynomial genera 二拍明七一彻

Finite size effects on helical edge states in HgTe quantum wells with the spin orbit coupling due to bulk- and structure-inversion asymmetries

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Chinese Physics B 2014年第3期23卷 498-503页

作者：成志周斌 Department of Physics Hubei University

There is a quantum spin Hall state in the inverted HgTe quantum well, characterized by the topologically protected gapless helical edge states lying within the bulk gap. It has been found that for a strip of finite width, the edge states on the two sides can couple together to produce a gap in the spectrum. The phenomenon is called the finite size effect in quantum spin Hall systems. In this paper, we investigate the effects of the spin-orbit coupling due to bulk- and structure-inversion asymmetries on the finite size effect in the HgTe quantum well by means of the numerical diagonalization method. When the bulk-inversion asymmetry is taken into account, it is shown that the energy gap Eg of the edge states due to the finite size effect features an oscillating exponential decay as a function of the strip width of the HgTe quantum well. The origin of this oscillatory pattern on the exponential decay is explained. Furthermore, if the bulk- and structure-inversion asymmetries are considered simultaneously, the structure-inversion asymmetry will induce a shift of the energy gap Eg closing point. Finally, based on the roles of the bulk- and structure-inversion asymmetries on the finite size effects, a way to realize the quantum spin Hall field effect transistor is proposed.

关键词： quantum spin Hall state finite size effect spin-orbit coupling

All optical method for measuring the carrier envelope phase from half-cycle cutoffs

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Chinese Physics B 2014年第7期23卷 439-443页

作者：李钱光陈欢张秀易煦农 School of Physics and Electronic-information Engineering Hubei Engineering University hubei Key Laboratory of Quality Control of Characteristic Fruits and Vegetables Hubei Engineering University

An all optical method is demonstrated for measuring the carrier-envelope phase （CEP） of few-cycle laser pulses. It is found that, in the few-cycle regime, the high harmonic spectrum generated from asymmetric molecules shows several half-cycle cutoffs that change their positions as the CEP varies. Such half-cycle cutoffs represent the fingerprint of different quantum trajectories and the waveform of the driving pulse. In this case, the CEP can be accurately measured from the half-cycle cutoffs.

关键词： high harmonic generation carrier-envelope phase measurement

Hochschild cohomology of special biserial algebras

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Science China Mathematics 2007年第8期50卷 1117-1128页

作者： Yun-ge XU Faculty of Mathematics & Computer Science,hubei university,Wuhan 430062,China Faculty of Mathematics & Computer Science Hubei University Wuhan China

Based on a four-term exact sequence,the formulae on the dimensions of the first and the second Hochschild cohomology groups of special biserial algebras with normed bases are obtained in terms of combinatorics.

关键词： special biserial algebra Hochschild cohomology medal 16E40 16G10

Comparison of fractal measures

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Science China Mathematics 2005年第11期48卷 1545-1553页

作者： QU Yanhui,WEN Shengyou & WEN Zhiying Department of Mathematics,Tsinghua university,Beijing 100084,China Department of Mathematics,hubei university, Wuhan 430062, China Department of Mathematics Tsinghua University Beijing China Department of Mathematics Hubei University Wuhan China

In this paper, the relationship between the s-dimensional Hausdorff measures and the g-measures in Rd is discussed, where g is a gauge function which is equivalent to ts and 0 < s≤d. It shows that if s=d, then Hg = c1Hd, Cg = c2Cd and Pg = c3Pd on Rd, where constants c1, c2 and c3 are determined by where Wg, Cg and Pg are the g-Hausdorff, g-central Hausdorff and g-packing measures on Rd respectively. In the case 0

关键词： gauge function Hausdorff measure central Hausdorff measure packing measure.

On Amenable Banach Algebras

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Journal of Mathematical Research with Applications 1991年第4期 487-496页

作者： Deng Hongjun Hu Yaohua(hubei university)

In this paper we extend the concept of amenable algebra given by Jobnsonin[3]to n-amenable *** prove several properties which are extensionof1-amenable algebras appeared in[3]and[4],and we give a sufficientcondition f... 详细信息

关键词： algebra sided projective proposition approximate commutative trivial associative 算子代数 topological

PERIODIC SOLUTION AND PERSISTENCE FOR A THREE-SPECIES RATIO-DEPENDENT PREDATOR-PREY MODEL WITH TIME DELAYS IN TWO-PATCH ENVIRONMENTS

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Journal of Systems Science & Complexity 2008年第2期21卷 226-238页

作者： Desheng TIAN College of Sciences Hubei University of Technology Wuhan 430068 China

The author considers a three-species ratio-dependent predator-prey model with time delay in a two-patch environments. This model is of periodic coefficients, which incorporates the periodicity of the environment. By means of the coincidence degree theory, sufficient conditions for the existence of at least one positive periodic solution of this model are established. Moreover, The author shows that the system is uniformly persistent under the conditions.

关键词： Coincidence degree periodic solution predator-prey model ratio-dependent uniform persistence.

新质公安战斗力视角下“市县主战、派出所主防”警务改革研究

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湖北警官学院学报 2024年第3期37卷 23-29页

作者：湖北警官学院专项研究课题组曹礼海湖北警官学院湖北武汉430034

新质公安战斗力源于新质生产力。从新质生产力三个构成要件出发,在新质公安战斗力“1-2-3-4”理论框架的指导下,加快推进“市县主战、派出所主防”警务改革,既是贯彻落实全面深化改革的迫切需要,也是主动适应治安形势的现实需要,更是加... 详细信息

新质公安战斗力源于新质生产力。从新质生产力三个构成要件出发,在新质公安战斗力“1-2-3-4”理论框架的指导下,加快推进“市县主战、派出所主防”警务改革,既是贯彻落实全面深化改革的迫切需要,也是主动适应治安形势的现实需要,更是加快形成和提升新质公安战斗力的重要举措。面对思想认识不高、能力素质不强、整体合力不足等现实问题,应从战略高度充分认识形成和提升新质公安战斗力的深刻内涵;建强主战阵地,着力研究提升警种实战攻坚能力的路径;夯实打牢主防根基,筑牢派出所战斗堡垒;聚焦效果导向,优化制度机制,全面提升新质公安战斗力质态,全力打造新质公安战斗力增长极。

关键词：新质公安战斗力市县主战派出所主防警务改革