检索结果-南通市图书馆

synchronization of nanowire-based spin Hall nano-oscillators

维普期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2022年第7期31卷 549-553页

作者：姜彪张文君 Mehran Khan Alam 于淑云韩广兵刘国磊颜世申康仕寿 School of Physics State Key Laboratory of Crystal MaterialsShandong UniversityJinan 250100China Department of Physics and Electronic Science Weifang UniversityWeifang 261061China

The synchronization of the spin Hall nano-oscillator(SHNO)device driven by the pure spin current has been investigated with micromagnetic simulations.It was found that the power spectra of nanowire-based SHNO devices can be synchronized by varying the current flowing in the heavy metal(HM)layer.The synchronized signals have relatively high power and narrow linewidth,favoring the potential applications.We also found that the synchronized spectra are strongly dependent on both the number and length of nanowires.Moreover,a periodic modulation of power spectra can be obtained by introducing interfacial Dzyaloshinskii–Moriya interaction(iDMI).Our findings could enrich the current understanding of spin dynamics driven by the pure spin current.Further,it could help to design novel spintronic devices.

关键词： spin Hall nano-oscillators synchronization Dzyaloshinskii–Moriya interaction spin wave

synchronization of an optical frequency comb and a microwave oscillator with 53 zs/Hz^(1/2) resolution and 10^(-20) -level stability

在线全文

学校读者我要写书评

暂无评论

Photonics Research 2022年第2期10卷 365-372页

作者： Changmin Ahn Yongjin Na Minji Hyun Jinho Bae Jungwon Kim School of Mechanical and Aerospace Engineering Korea Advanced Institute of Science and Technology(KAIST)Daejeon 34141Republic of Korea

Precise and stable synchronization between an optical frequency comb(femtosecond mode-locked laser oscillator or microresonator-based comb) and a microwave oscillator is important for various fields including telecommunication, radio astronomy, metrology, and ultrafast X-ray and electron science. Timing detection and synchronization using electro-optic sampling with an interferometer has been actively used for low-noise microwave generation, long-distance timing transfer, comb stabilization, time-of-flight sensing, and laser-microwave synchronization for ultrafast science facilities. Despite its outstanding performance, there has been a discrepancy in synchronization performance of more than 10 dB between the projected shot-noise-limited noise floor and the measured residual noise floor. In this work, we demonstrate the shot-noise-limited performance of an electro-optic timing detector-based comb-microwave synchronization, which enabled an unprecedented residual phase noise floor of -174.5 dBc∕Hz at 8 GHz carrier frequency(i.e., 53 zs∕Hz^(1/2)timing noise floor), integrated rms timing jitter of 88 as(1 Hz to 1 MHz), rms timing drift of 319 as over 12 h, and frequency instability of 3.6 × 10^(-20) over 10,000 s averaging time. We identified that bandpass filtering of the microwave signal and optical pulse repetition-rate multiplication are critical for achieving this performance.

关键词： synchronization interferometer synchronization

synchronization of stochastic complex networks with time-delayed coupling

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2023年第6期32卷 161-167页

作者：朵兰项林英陈关荣 School of Control Engineering Northeastern University at QinhuangdaoQinhuangdao 066004China School of Artificial Intelligence Tiangong UniversityTianjin 300387China Department of Electrical Engineering City University of Hong KongHong KongChina

Noise and time delay are inevitable in real-world networks. In this article, the framework of master stability function is generalized to stochastic complex networks with time-delayed coupling. The focus is on the effects of noise, time delay,and their inner interactions on the network synchronization. It is found that when there exists time-delayed coupling in the network and noise diffuses through all state variables of nodes, appropriately increasing the noise intensity can effectively improve the network synchronizability;otherwise, noise can be either beneficial or harmful. For stochastic networks, large time delays will lead to desynchronization. These findings provide valuable references for designing optimal complex networks in practical applications.

关键词： stochastic complex network synchronization noise time delay

synchronization–desynchronization transitions in networks of circle maps with sinusoidal coupling

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2023年第6期32卷 168-176页

作者：翟云肖井华郑志刚 School of Science Beijing University of Posts and TelecommunicationsBeijing 100876China Institute of Systems Science Huaqiao UniversityXiamen 361021China College of Information Science and Engineering Huaqiao UniversityXiamen 361021China

Coupled phase oscillators are adopted as powerful platforms in studying synchrony behaviors emerged in various systems with rhythmic dynamics. Much attention has been focused on coupled time-continuous oscillators described by differential equations. In this paper, we study the synchronization dynamics of networks of coupled circle maps as the discrete version of the Kuramoto model. Despite of its simplicity in mathematical form, it is found that discreteness may induce many interesting synchronization behaviors. Multiple synchronization and desynchronization transitions of both phases and frequencies are found with varying the coupling among circle-map oscillators. The mechanisms of these transitions are interpreted in terms of the mean-field approach, where collective bifurcation cascades are revealed for coupled circle-map oscillators.

关键词： synchronization circle map Kuramoto model bifurcation

synchronization between different motifs

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2010年第11期19卷 149-155页

作者：李莹刘曾荣 College of Information Technology Shanghai Ocean University Institute of Systems Biology Shanghai University

In this paper, we study the synchronization between different motifs. First, the synchronization between two networks with different topology structures and different dynamical behaviours is studied. With the open-plus-closed-loop（OPCL） method, conditions for two different networks to realize synchronization are given. Then based on the theoretical results achieved, the synchronization between different motifs is studied, which verifies the effectiveness and feasibility of the synchronization scheme.

关键词： OPCL method motif synchronization

synchronization of impulsively coupled complex networks

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2012年第5期21卷 126-132页

作者：孙文陈忠陈士华 School of Information and Mathematics Yangtze University School of Mathematics and Statistics Wuhan University

We investigate the synchronization of complex networks,which are impulsively coupled only at discrete instants.Based on the comparison theory of impulsive differential systems,a distributed impulsive control scheme is proposed for complex dynamical networks to achieve synchronization.The proposed scheme not only takes into account the influence of all nodes to network synchronization,which depends on the weight of each node in the network,but also provides us with a flexible method to select the synchronized state of the network.In addition,it is unnecessary for the impulsive coupling matrix to be symmetrical.Finally,the proposed control scheme is applied to a chaotic Lorenz network and Chua＇s circuit network.Numerical simulations are used to illustrate the validity of this control scheme.

关键词： complex network impulsive control scheme synchronization

synchronization between a novel class of fractional-order and integer-order chaotic systems via a sliding mode controller

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2012年第12期21卷 135-140页

作者：陈帝伊张润凡马孝义王娟 Department of Electrical Engineering College of Water Resources and Architectural EngineeringNorthwest Agriculture&Forestry University

In order to figure out the dynamical behaviour of a fractional-order chaotic system and its relation to an integer- order chaotic system, in this paper we investigate the synchronization between a class of fractional-order chaotic systems and integer-order chaotic systems via sliding mode control method. Stability analysis is performed for the proposed method based on stability theorems in the fractional calculus. Moreover, three typical examples are carried out to show that the synchronization between fractional-order chaotic systems and integer-orders chaotic systems can be achieved. Our theoretical findings are supported by numerical simulation results. Finally, results from numerical computations and theoretical analysis are demonstrated to be a perfect bridge between fractional-order chaotic systems and integer-order chaotic systems.

关键词： synchronization fractional-order system integer-order chaotic system sliding mode

synchronization between fractional-order chaotic systems and integer orders chaotic systems (fractional-order chaotic systems)

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2010年第9期19卷 233-238页

作者：周平程元明邝菲 Key Laboratory of Network Control and Intelligent Instrument of Ministry of Education Chongqing University of Posts and Telecommunications Institute of Applied Physics Chongqing University of Posts and Telecommunications

Based on the idea of tracking control and stability theory of fractional-order systems, a controller is designed to synchronize the fractional-order chaotic system with chaotic systems of integer orders, and synchronize the different fractional-order chaotic systems. The proposed synchronization approach in this paper shows that the synchronization between fractional-order chaotic systems and chaotic systems of integer orders can be achieved, and the synchronization between different fractional-order chaotic systems can also be realized. Numerical experiments show that the present method works very well.

关键词： fractional-order chaotic systems chaotic systems of integer orders different fractionalorder chaotic systems synchronization

synchronization and wave propagation in neuronal network under field coupling

在线全文

学校读者我要写书评

暂无评论

Science China(Technological Sciences) 2019年第3期62卷 448-457页

作者： LV Mi MA Jun YAO YuanGen ALZAHRANI Faris Department of Physics Lanzhou University of Technology College of Electrical and Information Engineering Lanzhou University of Technology Department of Physics College of Science Huazhong Agricultural University NAAM-Research Group Department of Mathematics King Abdulaziz University

Electric and chemical synapse play important role in connecting neurons and thus signal propagation can be realized between neurons. External electric stimulus can change the excitability of neuron and then the electrical activities can be modulated completely. Continuous fluctuation of ion concentration in cell can induce complex time-varying electromagnetic field during the exchange of charged ions across the membrane of neuron. Polarization and magnetization in the media(and neuron), which exposed to electromagnetic radiation, can modulate the dynamical response and mode transition in electrical activities of neurons. In this paper, magnetic flux is used to describe the effect of electromagnetic field, and the three-variable HindmarshRose neuron model is updated to propose a four-variable neuron model that the effect of electromagnetic induction and radiation can be explained. Based on the physical law of electromagnetic induction, exchange of charged ions and flow of ion currents will change the distribution of electromagnetic filed in cell, and each neuron will be exposed to the superimposed field triggered by other neurons. Therefore, signal exchange could occur even synapse coupling between neurons is removed in the case of field coupling. A chain network is proposed to investigate the signal exchange between neurons under field coupling when synapse coupling is not available. It is found that field coupling between neurons can change the collective behaviors in electrical activities. A statistical factor of synchronization and spatial patterns are calculated, these results confirmed that field coupling is effective for signal communication between neurons. In the end, open problems are suggested for readers' extensive guidance in this field.

关键词： neuron memristor magnetic flux synchronization pattern formation