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Communications in Theoretical Physics 2001年第10期36卷 385-390页

作者： yan zhen-Ya Department of Applied Mathematics Dalian University of Technology Dalian 116024 China

In this paper, similarity rcductions of Boussinesq-like equations with nonlinear dispersion (simply called B(m, n) equations) utt = (un)xx + (um) which is a generalized model of Boussinesq equation uts = (u2)xx + u and modified Bousinesq equation utt = (u3)xx + uxxxx, are considered by using the direct reduction method. As a result,several new types of similarity reductions are found. Based on the reduction equations and some simple transformations,we obtain the solitary wave solutions and compacton solutions (which are solitary waves with the property that after colliding with other compacton solutions, they re-emerge with the same coherent shape) of B(1, n) equations and B(m, m)equations, respectively.

关键词： nonlinear evolution equation, B(m, n) equations, similarity reduction, solitary wave solution,compacton solution

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Communications in Theoretical Physics 2001年第11期36卷 513-518页

作者： yan zhen-Ya Department of Applied Mathematics Dalian University of TechnologyDalian 116024China

In this paper,eight types of (1-+1)-dimensional similarity reductions which contain variable coefficient equation,are obtained for the generalized KdV equation in (2+1)-dimensional space arising from the multidimensional isospectral flows associated with the second-order scalar operators by using the direct *** addition,the cnoidal wave solution and dromion-like solution are also derived by using the reduced nonlinear ordinary differential *** (1+1) dromion obtained by Lou [***.A28 (1995) 7227] and Zhang [***.9 (2000) 1] is only a special case of our ***,some properties of the dromion-like solutions are analyzed.

关键词： generalized KdV equation,similarity reduction,Painlevé-I equation,Painlevé-II equation,cnoidal waves,dromion-like solution

Anisotropic magnetocaloric effect in a dysprosium(Ⅲ) single-molecule magnet——Commemorating the 100th anniversary of the birth of Academician Guangxian Xu

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Journal of Rare Earths 2021年第12期39卷 1554-1559,I0004页

作者： You-Song Ding yan-zhen zheng Xi'an Jiaotong University Shenzhen Research Academy Shenzhen 518057China Frontier Institute of Science and Technology Xi'an Jiaotong University

Dysprosium compounds with high magnetic anisotropy are widely studied as single molecule magnets(SMMs).Here the anisotropic magnetocaloric effect in a Dy(Ⅲ)SMM,{[Dy(OSiMe_(3))_(2)(4-Mepy)5(BPh_(4))]0.5 Toluene},was studied by single *** dependent magnetization can be observed at 300 K because of its high magnetic *** behavior measured along the easy axis direction is identical to that of the polycrystalline *** magnetization from the easy axis to the hard plane gives a maximum magnetic entropy change(-ΔSR)of 3.05 J/(kg·K)at 19 K atΔB=5 T,which enables the Dy(Ⅲ)SMM to be used as a low-temperature rotating magnetic refrigerant.

关键词： Lanthanide complex Magnetic anisotropy Rotate magnetocaloric effect Single molecule magnets Rare earths

New Jacobian Elliptic Function Solutions of Modified KdV Equation: Ⅱ

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Communications in Theoretical Physics 2002年第10期38卷 400-402页

作者： yan zhen-Ya Department of Mathematics University of British Columbia Vancouver BC Canada V6T 1Z2

Recently, we obtained thirteen families of Jacobian elliptic function solutions of mKdV equation by usingour extended Jacobian elliptic function expansion method. In this note, the mKdV equation is investigated and anotherthree families of new doubly periodic solutions (Jacobian elliptic function solutions) are fbund again by using a newtransformation, which and our extended Jacobian elliptic function expansion method form a new method still called theextended Jacobian elliptic function expansion method. The new method can be more powertul to be applied to othernonlinear differential equations.

关键词： modified KdV equation, Jacobian elliptic function, doubly periodic solution

Distributed privacy protection strategy for MEC enhanced wireless body area networks

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Digital Communications and Networks 2020年第2期6卷 229-237页

作者： yan zhen Hanyong Liu Key Laboratory of Optical Communication and Networks in Chongqing Key Laboratory of Ubiquitous Sensing and Networking in ChongqingChongqing400065China School of Communication and Information Engineering Chongqing University of Posts and TelecommunicationsChongqing400054China State Grid Information and Telecommunication Co.Ltd Beijing100031China

With the rapid development and widespread application of Wireless Body Area Networks(WBANs),the traditional centralized system architecture cannot handle the massive data generated by the edge ***,in order to ensure the security of physiological privacy data and the identity privacy of patients,this paper presents a privacy protection strategy for Mobile Edge Computing(MEC)enhanced WBANs,which leverages the blockchain-based decentralized MEC paradigm to support efficient transmission of privacy information with low latency,high reliability within a high-demand data security *** this basis,the Merkle tree optimization model is designed to authenticate nodes and to verify the source of physiological ***,a hybrid signature algorithm is devised to guarantee the node anonymity with unforgeability,data integrity and reduced *** security performance analysis and simulation results show that our proposed strategy not only reduces the delay,but also secures the privacy and transmission of sensitive WBANs data.

关键词： Wireless body area networks Blockchain Mobile edge computing Hybrid signature algorithm Merkle tree optimization model

Comparative Studies of Two Major Sets of Tibetan Medical Paintings: A Historical Perspective

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Chinese Journal of Integrative Medicine 2019年第11期25卷 803-811页

作者： zhen yan CAI Jing-feng China Institute for History of Medicine and Medical Literature China Academy of Chinese Medical Sciences

Tibetan medicine, one of the time-honored medical systems in the world, has increasingly been receiving attention the world over. Tibetan medical paintings (TMP, tib. Smart thang) has become one of the focal points in the studies of this medical system. To date, there are many atlases and publications on TMP, which are principally based on the two major sets of TMP series existing today in the world, the Lhasa set and the Buryat set. It has been found that the Buryat set is based on the Lhasa set, which was brought in late 19th to the first half of the 20th century from Tibet to Buryatia, Russia. A careful investigation on the basic structure of the two sets reveals that there are many differences between the two sets of paintings, including the total number of the paintings invoIved, of which some are missing in one set, the details of the captions of some of the paintings, the existenee of the 80th painting and its supervisor, and the overall order of the entire set, etc. The details of the differences are elaborated and discussed, and the prospective of developing the research to arrive at a standard and perfect TMP set in the future is also analyzed and anticipated.

关键词： Tibetan medical painting Sman thang Lhasa set Buryat set Tibetan painting art Sde srid Sangs rgyas rgya mtsho

Electrocatalytic response of poly(cobalt tetraaminophthalocyanine)/multi-walled carbon nanotubes-Nafion modified electrode toward sulfadiazine in urine

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Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2012年第6期13卷 503-510页

作者： Xiao-ping HONG yan ZHU yan-zhen ZHANG Department of Chemistry Zhejiang UniversityHangzhou 310028China Department of Chemistry Zhejiang Sci-Tech UniversityHangzhou 310018China Department of Stomatology the Second Affiliated HospitalSchool of MedicineZhejiang UniversityHangzhou 310009China

A highly sensitive amperometric sulfadiazine sensor fabricated by electrochemical deposition of poly(cobalt tetraaminophthalocyanine) (poly(Co II TAPc)) on the surface of a multi-walled carbon nanotubes-Nafion (MWCNTs-Nafion) modified electrode is *** electrode showed a very attractive performance by combining the advantages of Co II TAPc,MWCNTs,and *** with the bare glassy carbon electrode (GCE) and the MWCNTs-Nafion modified electrode,the electrocatalytic activity of poly(Co II TAPc)-coated MWCNTs-Nafion GCE generated greatly improved electrochemical detections toward sulfadiazine including low oxidation potential,high current responses,and good anti-fouling *** oxidation peak currents of sulfadiazine obtained on the new modified electrode increased linearly while increasing the concentration of sulfadiazine from 0.5 to 43.5 μmol/L with the detection limit of 0.17 μmol/L.

关键词： Sulfadiazine Electrochemical detection Cobalt tetraaminophthalocyanine Multi-walled carbon nanotubes

New Compacton-Like and Solitary Pattern-Like Solutions of （2＋1）-Dimensional Generalization of Modified KdV Equation

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Communications in Theoretical Physics 2005年第5X期44卷 789-792页

作者： CHEN Yong yan zhen-Ya Nonlinear Science Center and Department of Mathematics Ningbo University Ningbo 315211 China Key Laboratory of Mathematics Mechanization Institute of System Science Academy of Mathematics and System Sciences the Chinese Academy of Sciences Beijing 100080 China

Recently some (1+1)-dimensional nonlinear wave equations with linearly dispersive terms were shown to possess compacton-like and solitary pattern-like solutions. In this paper, with the aid of Maple, new solutions of (2+1)-dimensional generalization of mKd V equation, which is of only linearly dispersive terms, are investigated using three new transformations. As a consequence, it is shown that this (2+ 1)-dimensional equation also possesses new compacton-like solutions and solitary pattern-like solutions.

关键词： (2+1)-dimensional nonlinear wave equation comptacton-like solution solitary pattern-like solution

Chaos Control in a New Three-Dimensional Chaotic T System

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Communications in Theoretical Physics 2008年第4期49卷 951-954页

作者： CHEN Yong yan zhen-Ya Shanghai Key Laboratory of Trustworthy Computing East China Normal University Shanghai 200062 China Key Laboratory of Mathematics Mechanization Institute of Systems Science AMSS Chinese Academy of Sciences Beijing 100080 China International Centre for Materials Physics the Chinese Academy of Sciences Shenyang 110016 China

In this paper, we study chaos control of the new 3D chaotic system. We use three feedback methods （the linear, speed, doubly-periodic function controller） to suppress the chaos to unstable equilibrium. As a result, some controllers are obtained. Moreover, numerical simulations are used to verify the effectiveness of the obtained controllers.

关键词： chaos control chaotic T system feedback control Routh-Hurwitz theorem numerical simulation