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Magnetoelectric multiferroicity and quantum paraelectricity in hexaferrites

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Science China(Physics,Mechanics & Astronomy) 2019年第4期62卷 1-13页

作者： shi-peng Shen Young Sun Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences School of Physical Sciences University of Chinese Academy of Sciences

Multiferroic materials with coexisting ferroelectric and magnetic orders have attracted tremendous research interests because of their intriguing fundamental physics as well as potential applications in the next-generation multifunctional devices. Hexaferrites with conical magnetic structures are among the most promising single-phase multiferroics because strong magnetoelectric effects can be achieved in them from low temperatures up to room temperature in low magnetic fields. In this review, after briefly introducing the background on multiferroics and classification of hexaferrites, we summarize recent progress in multiferroic hexaferrites, including the mechanisms of spin-induced ferroelectricity, the magnetoelectric phase diagram, giant direct and converse magnetoelectric effects. Furthermore, we present a new mechanism of magnetic-ion-induced displacive polarization in hexaferrites, which leads to quantum paraelectricity and quantum electric-dipole liquid in M-type hexaferrites.

关键词： magnetoelectric effect hexaferrite quantum paraelectricity

PRICING OF LIBOR FUTURES BY MARTINGALE METHOD IN COX-INGERSOLL-ROSS MODEL

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Journal of Systems Science & Complexity 2010年第2期23卷 261-269页

作者： Ping LI peng shi Guangdong HUANG Xiaojun shi BeiHang University Beijing 100191 China. Northern Illinois University Illinois 60115 USA School of Information Engineering China Geosciences University Beijing 100083 China. BeiHang University Beijing 100083 China.

This paper considers the pricing of LIBOR futures in the Cox-Ingersoll-Ross(CIR)modelunder Pozdnyakov and Steele(2004)'s martingale framework for futures *** the CIR modelfor short term interest rate,we prove that there exists a unique futures price process associated withthe terminal value and the standard financial market,and that this unique futures price process has amartingale ***,a general closed-form pricing formula for LIBOR futures contractsis obtained in the CIR model.

关键词： Cox-Ingersoll-Ross model futures pricing LIBOR futures martingale.

Molecular and evolutionary analyses of formyl peptide receptors suggest the absence of VNO-specific FPRs in primates

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Journal of Genetics and Genomics 2010年第12期37卷 771-778页

作者： Hui Yang peng shi State Key Laboratory of Genetic Resources and Evolution Kunming Institute of ZoologyChinese Academy of SciencesKunming 650223China

Formyl peptide receptors (FPRs) were observed to expand in rodents and were recently suggested as candidate vomeronasal chemo-sensory receptors. Since vomeronasal chemosensory receptors usually underwent positive selection and evolved concordantly with the vomeronasal organ (VNO) morphology, we surveyed FPRs in primates in which VNO morphology is greatly diverse and thus it would provide us a clearer view of VNO-FPRs evolution. By screening available primate genome sequences, we obtained the FPR repertoires in representative primate species. As a result, we did not find FPR family size expansion in primates. Further analyses showed no evolution-ary force variance between primates with or without VNO structure, which indicated that there was no functional divergence among pri-mates FPRs. Our results suggest that primates lack the VNO-specific FPRs and the FPR expansion is not a common phenomenon in mammals outside rodent lineage, regardless of VNO complexity.

关键词： formyl peptide receptor vomeronasal chemosensory receptor primates

CONVERGENCE ANALYSIS OF MORLEY ELEMENT ON ANISOTROPIC MESHES

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Journal of Computational Mathematics 2006年第2期24卷 169-180页

作者： shi-peng Mao Shao-chun Chen ICMSEC Academy of Mathematics and System Sciences Chinese Academy of Sciences Beijing 100080 China Department of Mathematics Zhengzhou University Zhengzhou 450052 China

The main aim of this paper is to study tile convergence of a nonconforming triangular plate element-Morley element under anisotropic meshes. By a novel approach, an explicit bound for the interpolation error is derived for arbitrary triangular meshes （which even need not satisfy the maximal angle condition and the coordinate system condition ）, the optimal consistency error is obtained for a family of anisotropically graded finite element meshes.

关键词： Anisotropic meshes Interpolation error Consistency error Morley element.

Cooperative control for heterogeneous multi-agent systems: progress, applications, and challenges

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Science China(Information Sciences) 2024年第5期67卷 318-320页

作者： Bing YAN peng shi Jonathon CHAMBERS School of Electrical and Mechanical Engineering Faculty of Science Engineering and TechnologyThe University of Adelaide School of Engineering College of Science and Engineering University of Leicester

Cooperative control for heterogeneous multi-agent systems(MASs) is a critical and rapidly evolving field in modern automation and robotics. Characterized by the integration of agents with diverse capabilities and func... 详细信息

关键词： Multi agent systems

Application of Adaptive Fuzzy Spiking Neural P Systems in Fault Diagnosis of Power Systems

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Chinese Journal of Electronics 2014年第1期23卷 87-92页

作者： TU Min WANG Jun peng Hong shi peng School of Electrical and Information Engineering Xihua University Center for Radio Administration and Technology Development Xihua University Department of Computing and Mathematical Sciences University of Glamorgan PontypriddCF37 1DL UK School of Engineering and Science Victoria University MelbourneVic 8001 Australia

Adaptive fuzzy spiking neural P systems(AFSN P systems) are a novel kind of computing models with parallel computing and learning ability. Based on our existing works, AFSN P systems are applied to deal with the fault diagnosis problems of power systems and the uncertainty of action messages about protective relays and breakers, and a new fault diagnosis model of power systems is proposed with simple reasoning process and fast speed with parallel processing capabilities. The effectiveness of the fault diagnosis model is verified by some examples of fault diagnosis. Furthermore, the learning ability of AFSN P systems can be applied to adjust the weights in the fault diagnosis model automatically.

关键词： Membrane computing Spiking neural P systems Fault diagnosis Power systems

Studies on Electrochemical Property of LiFePO_4/C as Cathode Material for Lithium Ion Batteries

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Chemical Research in Chinese Universities 2006年第1期22卷 73-75页

作者： HUANG Xiao-wen shi peng-fei Faculty of Applied Chemistry Harbin Institute of Technology Harbin 150001 P.R. China College of Material Science and Engineering Shandong University of Science and Technology Qingdao 266510 P. R. China

LiFePO4/C samples were prepared at different temperatures by adding sngar to the synthetic precursor. The samples were characterized by X-ray diffraction（XRD）. Their crystal phases show an olivine structure. Only the sample obtained at 700℃ has a larger discharge capacity, which has good electrochemical properties： its discharge specific capacity is 120. 3 mAh/g at a current of 0. 05 mA, and its capacity fade is very low after 20 cycles. It is demonstrated that the best synthetic temperature should be 700℃.

关键词： Olivine Lithium ion battery Carbon-coated LiFePO4

Rural transformation,income growth,and poverty reduction by region in China in the past four decades

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Journal of Integrative Agriculture 2023年第12期22卷 3582-3595页

作者： shi peng-fei HUANG Ji-kun China Center for Agricultural Policy School of Advanced Agricultural SciencesPeking UniversityBeijing 100871P.R.China Research Center for Rural Economy Ministry of Agriculture and Rural AffairsBeijing 100810P.R.China

China has experienced rapid rural transformation in the past four *** the rapid transformation is a significant rise in rural household income and a substantial fall in rural *** paper examines the evolutions of and the relationships between rural transformation(high-value agriculture and rural non-farm employment)and its outcomes(per capita rural income and rural poverty incidence)using provincial-level *** results show that 31 provinces/autonomous regions/municipalities have undergone significant rural transformation,but the level and speed of rural transformation differed ***,an increased level of rural transformation is often associated with higher per capita rural income and reduced rural poverty ***,a category of provincial rural transformation based on high-value agriculture and rural non-farm employment is also *** further discuss the likely impacts of institutions,policies,and investments(IPIs)on rural transformation and conclude with policy implications.

关键词： rural transformation high-value agriculture non-farm employment income poverty China

Fixed-Time Output Consensus Tracking for High-Order Multi-Agent Systems With Directed Network Topology and Packet Dropout

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IEEE/CAA Journal of Automatica Sinica 2021年第4期8卷 817-836页

作者： Junkang Ni peng shi Yu Zhao Zhonghua Wu School of Automation Northwestern Polytechnical UniversityXi’an 710072China School of Electrical and Electronic Engineering University of AdelaideSA 5005Australia College of Electrical Engineering and Automation Henan Polytechnic UniversityJiaozuo 454000China

This paper studies the problem of fixed-time output consensus tracking for high-order multi-agent systems(MASs)with directed network topology with consideration of data packet ***,a predictive compensation based distributed observer is presented to compensate for packet dropout and estimate the leader’s ***,stability analysis is conducted to prove fixed time convergence of the developed distributed ***,adaptive fixed-time dynamic surface control is designed to counteract mismatched disturbances introduced by observation error,and stabilize the tracking error system within a fixed time,which overcomes explosion of complexity problem and singularity ***,simulation results are provided to verify the effectiveness and superiority of the consensus tracking strategy *** contribution of this paper is to provide a fixed-time distributed observer design method for high-order MAS under directed graph subject to packet dropout,and a novel fixed-time control strategy which can handle mismatched disturbances and overcome explosion of complexity and singularity problem.

关键词： Directed graph fixed-time control multi-agent system output consensus tracking packet dropout