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Effect of Dzialoshinski-Moriya interaction on thermal entanglement of a mixed-spin chain

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Science china(Physics,Mechanics & Astronomy) 2008年第12期51卷 1897-1904页

作者： ma xiaosan ZHANG JiaYan CONG HongShou wang anmin school of electric engineering and information Anhui University of TechnologyMa’anshan 243002China Department of Modern Physics University of Science and Technology of ChinaHefei 230026China

The effect of Dzialoshinski-Moriya (DM) interaction on thermal entanglement of a mixed-spin chain in an external magnetic field is investigated. It is found that DM interaction may enhance quantum thermal entanglement to a maximal value even though the magnetic field plays a positive role in shrinking thermal entanglement in the mixed-spin chain. Furthermore, the effect of inhomogeneity of the magnetic field on quantum entanglement is analyzed. Our analysis will shed some light on the understanding of the effect of the DM interaction on thermal entanglement of a mixed-spin chain.

关键词： thermal entanglement a mixed-spin chain DM interaction

Effect of decoherence from a spin environment on the entanglement dynamics of two-qutrit states

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Science china(Physics,Mechanics & Astronomy) 2011年第10期54卷 1833-1838页

作者： ma xiaosan REN MingFan ZHAO GuangXing wang anmin school of electric engineering and information Anhui University of Technology Ma'anshan 243002 China Department of Modern Physics University of Science and Technology of China Hefei 230026 China

The entanglement dynamics of a two-qutrit system under decoherence from a spin environment is investigated by using negativityas entanglement measure. Our results imply that the entanglement evolution depends not only on the coupling strength and thetunneling elements of the environment but also on the number of the freedom degrees and the initial state of the environment.

关键词： entanglement dynamics quantum decoherence a spin environment

Quantum discord of thermal states of a spin chain with Calogero-Moser type interaction

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Science china(Physics,Mechanics & Astronomy) 2013年第3期56卷 600-605页

作者： ma xiaosan QIAO Ying ZHAO GuangXing wang anmin school of electric engineering and information Anhui University of Technology Department of Modern Physics University of Science and Technology of China

In this paper,we have investigated the effect of Calogero-Moser type interaction on the quantum discord of thermal states of a spin *** results imply that the quantum discord depends on the relative distance between the spins,the external magnetic field,and the *** a comparison between the quantum discord and the entanglement of formation,the quantum discord is more robust than the entanglement of formation in the sense that the latter takes a zero value in a large range of the parameters,while the former takes a nonzero value.

关键词： quantum discord entanglement of formation Calogero-Moser interactions

Memristive feature and mechanism induced by laser-doping in defect-free 2D semiconductor materials

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Journal of Semiconductors 2024年第7期45卷 85-91页

作者： Xiaoshan Du Shu wang Qiaoxuan Zhang Shengyao Chen Fengyou Yang Zhenzhou Liu Zhengwei Fan Lijun ma Lei wang Lena Du Zhongchang wang Cong wang Bing Chen Qian Liu College of Electronic and information engineering Shandong University of Science and TechnologyQingdao 266590China National Center for Nanoscience and technology&university of Chinese Academy of Sciences Beijing 100190China Hebei university of Water Resources and electric engineering electrical Automation Department Cangzhou 061001China The MOE Key Laboratory of Weak-Light Nonlinear Photonics and International Sino-Slovenian Join Re-search Center on Liquid Crystal Pho-tonics TEDA Institute of Applied Physics and School of PhysicsNankai UniversityTianjin 300457China College of mathematics and Physics Shandong Advanced Optoelectronic Materials and Technologies Engineering LaboratoryQingdao Uni-versity of Science and TechnologyQingdao 266061China Department of Physics Capital Normal UniversityBeijing 100048China Department of Advanced materials and Computing International Iberian Nanotechnology Laboratory(INL)4715-330 BragaPortugal College of mathematics and Physics Beijing University of Chemical TechnologyBeijing 100029China

Memristors as non-volatile memory devices have gained numerous attentions owing to their advantages in storage,in-memory computing, synaptic applications, etc. In recent years, two-dimensional(2D) materials with moderate defects have been discovered to exist memristive feature. However, it is very difficult to obtain moderate defect degree in 2D materials, and studied on modulation means and mechanism becomes urgent and essential. In this work, we realized memristive feature with a bipolar switching and a configurable on/off ratio in a two-terminal MoS_(2) device(on/off ratio ~100), for the first time, from absent to present using laser-modulation to few-layer defect-free MoS_(2)(about 10 layers), and its retention time in both high resistance state and low resistance state can reach 2.10^(4) s. The mechanism of the laser-induced memristive feature has been cleared by dynamic Monte Carlo simulations and first-principles calculations. Furthermore, we verified the universality of the laser-modulation by investigating other 2D materials of TMDs. Our work will open a route to modulate and optimize the performance of 2D semiconductor memristive devices.

关键词： 2D-material memristor laser doping laser direct writing memristive mechanism

A Fault-Tolerant Mobility-Aware Caching Method in Edge Computing

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Computer Modeling in engineering & Sciences 2024年第7期140卷 907-927页

作者： Yong ma Han Zhao Kunyin Guo Yunni Xia Xu wang Xianhua Niu Dongge Zhu Yumin Dong school of Computer information engineering Jiangxi Normal UniversityNanchang330000China school of Digital Industry Jiangxi Normal UniversityShangrao334000China The College of Computer Science Chongqing UniversityChongqing400044China College of Mechanical and Vehicle engineering Chongqing UniversityChongqing400030China school of Computer and Software engineering Xihua UniversityChengdu610039China electric Power Research Institute of State Grid Ningxia electric Power Company Ltd. Yinchuan750002China College of Computer and information Science Chongqing Normal UniversityChongqing401331China

Mobile Edge Computing(MEC)is a technology designed for the on-demand provisioning of computing and storage services,strategically positioned close to *** the MEC environment,frequently accessed content can be deployed and cached on edge servers to optimize the efficiency of content delivery,ultimately enhancing the quality of the user ***,due to the typical placement of edge devices and nodes at the network’s periphery,these components may face various potential fault tolerance challenges,including network instability,device failures,and resource *** the dynamic nature ofMEC,making high-quality content caching decisions for real-time mobile applications,especially those sensitive to latency,by effectively utilizing mobility information,continues to be a significant *** response to this challenge,this paper introduces FT-maACC,a mobility-aware caching solution grounded in multi-agent deep reinforcement learning and equipped with fault tolerance *** approach comprehensively integrates content adaptivity algorithms to evaluate the priority of highly user-adaptive cached ***,it relies on collaborative caching strategies based onmulti-agent deep reinforcement learningmodels and establishes a fault-tolerancemodel to ensure the system’s reliability,availability,and *** results unequivocally demonstrate that FTmaACC outperforms its peer methods in cache hit rates and transmission latency.

关键词： Mobile edge networks mobility fault tolerance cooperative caching multi-agent deep reinforcement learning content prediction

Significantly enhanced ion-migration and sodium-storage capability derived by strongly coupled dual interfacial engineering in heterogeneous bimetallic sulfides with densified carbon matrix

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Susmat 2024年第3期4卷 175-191页

作者： Wenxi Zhao Xiaoqing ma Guangzhao wang Linglin Tan Xinqin wang Xun He Yan wang Yongsong Luo Dongdong Zheng Shengjun Sun Qian Liu Luming Li Wei Chu Xuping Sun school of Electronic information engineering Yangtze Normal UniversityFulingChongqingChina Institute of Fundamental and Frontier Sciences University of Electronic Science and Technology of ChinaChengduSichuanChina school of Electronic engineering Lanzhou City UniversityLanzhouGansuChina College of Chemistry Chemical Engineering and Materials ScienceShandong Normal UniversityJinanShandongChina Institute for Advanced Study Chengdu UniversityChengduSichuanChina

The development of highly efficient sodium-ion batteries depends critically on the successful exploitation of advanced anode hosts that is capable of overcoming sluggish reaction kinetics while also withstanding severe structural deformation triggered by the large radius of Na^(+)-***,a hierarchically hybrid material with hetero-Co_(3)S_(4)/NiS hollow nanosphere packaged into a densified N-doped carbonmatrix(Co_(3)S_(4)/NiS@N-C)was designed and fabricated utilizing CoNi-glycerate as the self-sacrifice template,making the utmost of the synergistic effect of hetero-Co_(3)S_(4)/NiS with strong electric field and rich reaction active-sites together with the densified outer-carbon scaffolds with remarkable electronic conductivity and robust mechanical *** anticipated,as-fabricated Co_(3)S_(4)/NiS@N-C anode affords remarkable specific capacity,prolonged cycle lifespan up to 2400 cycles with an only 0.05%fading each cycle at 20.0 A g^(−1),and excellent rate feature(354.9 mah g^(−1)at 30.0 A g^(−1)),one of the best performances for most existing Co_(3)S_(4)/NiS-based *** situ structural characterizations in tandem with theoretical analysis demonstrate the reversible insertion-conversion mechanism of initially proceeding with Na^(+)de-/intercalation and superior heterogeneous interfacial reaction behavior with strong Na^(+)-adsorption ***,sodium-ion full cell and hybrid capacitor based on Co_(3)S_(4)/NiS@N-C anode exhibit impressive electrochemical characteristics on cycling performance and rate capability,showcasing its outstanding feasibility toward practical use.

关键词： anode materials bimetallic metal sulfides heterogeneous interface outer-carbon skeleton sodium ion battery

Proactive Caching at the Wireless Edge:A Novel Predictive User Popularity-Aware Approach

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Computer Modeling in engineering & Sciences 2024年第8期140卷 1997-2017页

作者： Yunye Wan Peng Chen Yunni Xia Yong ma Dongge Zhu Xu wang Hui Liu Weiling Li Xianhua Niu Lei Xu Yumin Dong College of Computer Science Chongqing UniversityChongqing400044China school of Computer and Software engineering Xihua UniversityChengdu610039China school of Computer and information engineering Jiangxi Normal UniversityNanchang330022China electric Power Research Institute of State Grid Ningxia electric Power Co. Ltd.Yinchuan750002China College of Mechanical and Vehicle engineering Chongqing UniversityChongqing400030China school of Computer Science and technology Beijing Institute of TechnologyBeijing100083China school of Computer Science and technology Dongguan University of TechnologyDongguan523808China school of Emergency management Xihua UniversityChengdu610039China College of Computer and information Science Chongqing Normal UniversityChongqing401331China

Mobile Edge Computing(MEC)is a promising technology that provides on-demand computing and efficient storage services as close to end users as *** an MEC environment,servers are deployed closer to mobile terminals to exploit storage infrastructure,improve content delivery efficiency,and enhance user ***,due to the limited capacity of edge servers,it remains a significant challenge to meet the changing,time-varying,and customized needs for highly diversified content of ***,techniques for caching content at the edge are becoming popular for addressing the above *** is capable of filling the communication gap between the users and content providers while relieving pressure on remote cloud ***,existing static caching strategies are still inefficient in handling the dynamics of the time-varying popularity of content and meeting users’demands for highly diversified entity *** address this challenge,we introduce a novel method for content caching over MEC,i.e.,*** synthesizes a content popularity prediction model,which takes users’stay time and their request traces as inputs,and a deep reinforcement learning model for yielding dynamic caching *** results demonstrate that PRIME,when tested upon the MovieLens 1M dataset for user request patterns and the Shanghai Telecom dataset for user mobility,outperforms its peers in terms of cache hit rates,transmission latency,and system cost.

关键词： Mobile edge computing content caching system average cost deep reinforcement learning collaborative mechanism

An ultrathin wide-band planar metamaterial absorber based on a fractal frequency selective surface and resistive film

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Chinese Physics B 2013年第6期22卷 570-575页

作者：范跃农程用志聂彦王鲜龚荣洲 school of Optical and Electronic information Huazhong University of Science and Technology Department of Mechanical and Electronic engineering Jingdezhen Ceramic Institute

We propose an ultrathin wide-band metamaterial absorber （ma） based on a Minkowski （MIK） fractal frequency selective surface and resistive film. This absorber consists of a periodic arrangement of dielectric substrates sandwiched with an MIK fractal loop structure electric resonator and a resistive film. The finite element method is used to simulate and analyze the absorption of the ma. Compared with the ma-backed copper film, the designed ma-backed resistive film exhibits an absorption of 90% at a frequency region of 2 GHz-20 GHz. The power loss density distribution of the ma is further illustrated to explain the mechanism of the proposed ma. Simulated absorptions at different incidence cases indicate that this absorber is polarization-insensitive and wide-angled. Finally, further simulated results indicate that the surface resistance of the resistive film and the dielectric constant of the substrate can affect the absorbing property of the ma. This absorber may be used in many military fields.

关键词： wide-band metamaterial absorber fractal frequency selective surface resistive films

Quantum discord of thermal states of a spin chain with Calogero-Moser type interaction

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Science china Chemistry 2013年第3期56卷 600-605页

关键词： quantum discord entanglement of formation Calogero-Moser interactions