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Preparation of BiFeO_3 solution and its movement effects controlled by electrical field

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Rare Metals 2012年第5期31卷 507-511页

作者： lou Jianyong JIANG Xingsheng XU Tiejun liang Deliang JIAO Fangjun GAO Lin State Key Laboratory of Electrical Insulation and Power Equipment Xi 'an Jiaotong University Xi 'an 710049 China Xi'an Modern Control Technology Institute Xi'an 710065 China

This paper demonstrated our discovery of the movement effect of BiFeO_3 nanoparticles in solution by strong electrical polarization. First, BiFeO_3 nanoparticles were prepared by ball milling and characterized by SEM. Then, the preparation of BiFeO_3 solution was finished. BiFeO_3 nanoparticles are found to move in solution due to electrical field. The movement velocity of BiFeO_3 nanoparticles, which is about 10 μm·s^-1 , is influenced and controlled by the applied electrical field. The concentration of BiFeO_3 solution and the nanoparticle sizes also have effects on its movement properties. The movement of BiFeO_3 nanoparticles in solution is induced by strong polarization, and BiFeO_3 nanoparticles have net negative electric charges because of the electrostatic force between BiFeO_3 nanoparticles and the negative ions in water resolver.

关键词： BiFeO_3 solution movement property nanoparticle multi-ferroic material

On Characterization of Poisson Integrals of Schr?dinger Operators with Morrey Traces

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Acta Mathematica Sinica,English Series 2018年第4期34卷 787-800页

作者： liang SONG xiao xiao TIAN Li Xin YAN Department of Mathematics Sun Yat-sen University

Let L be a Schrodinger operator of the form L = -△ ＋ V acting on L2（Rn） where the nonnegative potential V belongs to the reverse Holder class Bq for some q _〉 n. In this article we will show that a function f∈ L2,λ（Rn）, 0 〈λ 〈 n, is the trace of the solution of Lu = -utt ＋ Lu = O, u（x, 0） = f（x）, where u satisfies a Carleson type condition sup t-λB xB,rB∫τB 0∫B（xB,τB）t{ u（x,t）}2dxdt≤C〈∞.Its proof heavily relies on investigate the intrinsic relationship between the classical Morrey spaces and the new Campanato spaces .L2,λL（Rn） associated to the operator L, i.e. Conversely, this Carleson type condition characterizes all the L-harmonic functions whose traces belong to the space L2,λ（Rn） for all 0 〈λ〈 n.

关键词： SchrSdinger operators Dirichlet problem Morrey spaces Campanato spaces Poissonsemigroup

Solitons and soliton molecules in two nonlocal Alice–Bob Sawada–Kotera systems

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Communications in Theoretical Physics 2020年第8期72卷 50-56页

作者： Zhao Qi-liang lou Sen-Yue Jia Man School of Physical Science and Technology Ningbo UniversityNingbo315211China

Two nonlocal Alice–Bob Sawada–Kotera(ABSK) systems, accompanied by the parity and time reversal invariance are studied. The Lax pairs of two systems are uniformly written out in matrix form. The periodic waves, multiple solitons, and soliton molecules of the ABSK systems are obtained via the bilinear method and the velocity resonant mechanism. Though the interactions among solitons are elastic, the interactions between soliton and soliton molecules are not *** particular, the shapes of the soliton molecules are changed explicitly after interactions.

关键词： soliton molecules nonlocal Sawada–Kotera equations nonelastic interactions periodic and solitary waves

Fifth-Order Alice-Bob Systems and Their Abundant Periodic and Solitary Wave Solutions

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Communications in Theoretical Physics 2019年第10期71卷 1149-1154页

作者： Qi-liang Zhao Man Jia Sen-Yue lou School of Physical Science and Technology Ningbo UniversityNingbo 315211China Shanghai Key Laboratory of Trustworthy Computing East China Normal UniversityShanghai 200062China

The study on the nonlocal systems is one of the hot topics in nonlinear science. In this paper, the well-known fifth-order integrable systems including the Sawada-Kotera(SK) equation, the Kaup-Kupershmidt(KK) equation and the fifth-order Koterweg-de Vrise(FOKd V) equation are extended to a generalized two-place nonlocal form, the generalised fifth-order Alice-Bob system. The Lax integrability of two sets of Alice-Bob systems for all the SK, KK and FOKd V type systems are explicitly given via matrix Lax pairs. The ■ symmetry breaking and symmetry invariant periodic and solitary waves for one set of nonlocal SK, KK and FOKd V system are investigated via a special travelling wave solution ansatz.

关键词： Alice-Bob SK equarions Alice-Bob KK equations periodic and solitary waves

Image Encryption Algorithm Based on Compressive Sensing and Fractional DCT via Polynomial Interpolation

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International Journal of Automation and computing 2020年第2期17卷 292-304页

作者： Ya-Ru liang Zhi-Yong xiao School of Engineering Jiangxi Agricultural UniversityNanchang 330045China School of Software Jiangxi Agricultural UniversityNanchang 330045China

Based on compressive sensing and fractional discrete cosine transform(DCT)via polynomial interpolation(PI-FrDCT),an image encryption algorithm is proposed,in which the compression and encryption of an image are accomplished *** can keep information secret more effectively with low data ***-dimensional piecewise and nonlinear chaotic maps are employed to obtain a generating sequence and the exclusive OR(XOR)matrix,which greatly enlarge the key space of the encryption *** many other fractional transforms,the output of PI-FrDCT is real,which facilitates the storage,transmission and display of the encrypted *** to the introduction of a plain-image-dependent disturbance factor,the initial values and system parameters of the encryption scheme are determined by cipher keys and ***,the proposed encryption scheme is very sensitive to the plain-image,which makes the encryption system more *** results demonstrate the validity and the reliability of the proposed encryption algorithm.

关键词： Compressive sensing fractional discrete cosine transform(DCT)via polynomial interpolation image encryption threedimensional piecewise and nonlinear chaotic maps real-valued output

A general observatory control software framework design for existing small and mid-size telescopes

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Research in Astronomy and Astrophysics 2015年第7期15卷 1077-1088页

作者： liang Ge xiao-Meng Lu xiao-Jun Jiang Key Laboratory of Optical Astronomy National Astronomical Observatories Chinese Academy of Sciences University of Chinese Academy of Sciences

A general framework for observatory control software would help to improve the efficiency of observation and operation of telescopes, and would also be advantageous for remote and joint observations. We describe a general framework for observatory control software, which considers principles of flexibility and inheritance to meet the expectations from observers and technical personnel. This framework includes observation scheduling, device control and data storage. The design is based on a finite state machine that controls the whole process.

关键词： telescopes -- instrumentation: detectors -- control software

Lsyn-Esyn,p-δrelation in active galactic nucleus jets and implication for the physical origin of the Lp-Ep,z-Γ_0 relation of gamma-ray bursts

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Research in Astronomy and Astrophysics 2020年第9期20卷 201-209页

作者： xiao-Li Huang En-Wei liang School of Astronomy and Space Science Nanjing UniversityNanjing 210023China Guangxi Key Laboratory for Relativistic Astrophysics School of Physical Science and TechnologyGuangxi UniversityNanning 530004China

High energy photon radiations of gamma-ray bursts(GRBs)and active galactic nuclei(AGNs)are dominated by their jet *** examine whether the synchrotron radiations of jets in BL Lacs,flat spectrum radio quasars(FSRQs),and Narrow Line Seyfert 1 galaxies(NLS1s)follow the relation between the prompt gamma-ray emission and the initial Lorentz factor(Γ0)of *** is shown that the AGN sample does not agree with the Lp-Ep,z-Γ0 relation of *** addition,we obtain a tight relation of Lsyn∝Е0.45±0.15δ3.50±0.25 syn,p for FSRQs and NLS1 galaxies,where Lsyn is the luminosity at peak photon energy Esyn,p of the synchrotron *** relation is different from the Lp-Ep,z-Γ0 relation of GRB *** dependence of Lsyn toδis consistent with the expectation of the Doppler boosting effect for the FSRQs and NLS1 galaxies,but it is not for *** argue thatΓ0 may be a representative of the kinetic power of the radiating region and the tight Lp-Ep,z-Γ0 relation is shaped by the radiation physics and the jet power together.

关键词： gamma-ray burst:general quasars:general BL Lacertae objects:general galaxies:Seyfert stars:jets radiation mechanisms:non-thermal

New routes for the construction of strong metal-support interactions

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Science China Chemistry 2022年第11期65卷 2051-2057页

作者： Hai Wang liang Wang Feng-Shou xiao Key Lab of Biomass Chemical Engineering of Ministry of Education College of Chemical and Biological EngineeringZhejiang UniversityHangzhou310027China College of Chemistry Zhengzhou UniversityZhengzhou 450001China

Supported metal nanoparticles(NPs)on solid carriers are highly efficient catalysts in many industrial ***,the sintering and/or leaching of metal NPs occurred under harsh reaction conditions that caused the catalyst *** metal-support interactions(SMSIs)serve as an effective method to stabilize the metal NPs against sintering and leaching,which have been extensively *** addition to the classical route to construct SMSIs via high-temperature reduction treatments,new routes have emerged recently to extend the scope of catalysts with SMSIs and optimized their catalytic *** this review,we briefly summarize these routes that avoid the high-temperature reduction treatments for the construction of *** significant advantages in stabilizing metal NPs,modulating the geometric/electronic structure of metal species,and the mechanism on the SMSI formation are particularly ***,the current challenges and developing trends in the construction of SMSIs for achieving more efficient catalysts are outlooked.

关键词： strong metal-support interaction supported catalyst metal nanoparticles heterogeneous catalysis

Approximate Symmetries and Infinite Series Symmetry Reduction Solutions to Perturbed Kuramoto-Sivashinsky Equation

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Communications in Theoretical Physics 2009年第5期51卷 785-788页

作者： YAO Ruo-Xia JIAO xiao-Yu lou Sen-Yue Department of Physics Shanghai Jiao Tong University Shanghai 200062 China School of Computer Science Shaanxi Normal University Xi＇an 710062 China Department of Physics Ningbo University Ningbo 315211 China

Starting from Lie symmetry theory and combining with the approximate symmetry method, and using the package LieSYMGRP proposed by us, we restudy the perturbed Kuramoto-Sivashinsky （KS） equation. The approximate symmetry reduction and the infinite series symmetry reduction solutions of the perturbed KS equation are constructed. Specially, if selecting the tanh-type travelling wave solution as initial approximate, we not only obtain the general formula of the physical approximate similarity solutions, but also obtain several new explicit solutions of the given equation, which are first reported here.

关键词： perturbed Kuramoto-Sivashinsky equation approximate symmetry reduction series reduction solution