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bistable electrowetting device with non-planar designed controlling electrodes for display applications

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Frontiers of Information Technology & Electronic Engineering 2019年第9期20卷 1289-1295页

作者： Han ZHANG Xue-lei LIANG Key Laboratory for the Physics and Chemistry of Nanodevices Department of ElectronicsPeking UniversityBeijing 100871China

bistable electrowetting display(EWD)is a promising low-power electronic paper technology,where power is consumed only during the switching between two stable states;however,it is not required for state maintenance once switched.In this paper,a bistable electrowetting device with non-planar designed controlling electrodes is fabricated by a fully conventional photolithography process.The device has potential for video display applications with a controllable gray scale.The novel electrode design realizes a lower driving voltage and a higher contrast between two stable states than the EWDs with planar electrodes reported previously.

关键词： bistable electrowetting Non-planar Controlling electrodes Low voltage High contrast

bistable Stochastic Resonance Enhanced 4-ary PAM Signal Detection under Low SNR

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China Communications 2019年第4期16卷 196-207页

作者： Linlin Liang Nina Zhang Haiyan Huang Zan Li School of Telecommunications Engineering Xidian University Xianyang Detachment of Chinese Armed Police Force School of Electronic and Information Engineering Lanzhou Jiaotong University The Collaborative Innovation Center of Information Sensing and Understanding at Xidian University

To boost the performance of 4-ary pulse amplitude modulated(PAM) at low signal-to-noise ratio(SNR), bistable stochastic resonance(BSR) system is introduced into digital communications system and get a reliable signal detection scheme. In this paper, we first analyse BSR system for different amplitudes of 4-ary PAM signals. The steadystate of the bistable system will be statistically distinct, and the feasibility of the proposed detection scheme is confirmed. On this basis, we present a detailed study on steady-state transitions of the BSR system, and an explicit expression of the bistable system parameters is derived. By setting the bistable system parameters, bistable system, 4-ary PAM signal, and noise reach the resonance state, and the BSR-based detection scheme is implemented. Moreover, we derive an analytical expression to calculate the symbol error rate(SER) of 4-ary PAM signals with the BSR-based detection under additive white Gaussian noise(AWGN). Finally, the simulation results validate that BSR-based detection scheme can improve the detection performance while efficiently reducing the symbol error rate.

关键词： 4-ary pulse amplitude modulated signal detection Low SNR Symbol error rate(SER) bistable stochastic resonance(BSR)

Stationary patterns in a discrete bistable reaction-diffusion system:mode analysis

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Chinese Physics B 2010年第10期19卷 174-183页

作者：邹为占萌 Wuhan Institute of Physics and Mathematics the Chinese Academy of Sciences Graduate School of the Chinese Academy of Sciences

This paper theoretically analyses and studies stationary patterns in diffusively coupled bistable elements. Since these stationary patterns consist of two types of stationary mode structure： kink and pulse, a mode analysis method is proposed to approximate the solutions of these localized basic modes and to analyse their stabilities. Using this method, it reconstructs the whole stationary patterns. The cellular mode structures （kink and pulse） in bistable media fundamentally differ from stationary patterns in monostable media showing spatial periodicity induced by a diffusive Taring bifurcation.

关键词： discrete reaction-diffusion system stationary patterns bistable mode analysis

Delay induced transitions in an asymmetry bistable system and stochastic resonance

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Science China(Physics,Mechanics & Astronomy) 2010年第4期53卷 745-750页

作者： ZHANG HuiQing , XU Wei, XU Yong & ZHOU BingChang Department of Applied Mathematics, Northwestern Polytechnical University, Xi’an 710072, China Department of Applied Mathematics Northwestern Polytechnical University Xi’an China

The delay Fokker-Planck equation is given for an asymmetry bistable system with correlated Gaussian white noises. The small delay approximation based on the probability density approach is used and the approximate stationary probability density function is obtained. The phenomenon of delay induced transitions is found. When a weak periodic signal is added, the phenomenon of stochastic resonance is investigated. Expression of the signal-to-noise ratio (SNR) is obtained by using the two-state theory. It is shown that the time delay can suppress or promote the stochastic resonance phenomenon.

关键词： stochastic resonance time-delayed asymmetry bistable system correlated noises

STABILITY OF TIME-PERIODIC TRAVELING FRONTS IN bistable REACTION-ADVECTION-DIFFUSION EQUATIONS

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Acta Mathematica Scientia 2016年第3期36卷 802-814页

作者：盛伟杰 Natural Science Research Center Harbin Institute of Technology

This paper is concerned with the global exponential stability of time periodic traveling fronts of reaction-advection-diffusion equations with time periodic bistable nonlinearity in infinite cylinders. It is well known that such traveling fronts exist and are asymptotically stable. In this paper, we further show that such fronts are globally exponentially stable. The main difficulty is to construct appropriate supersolutions and subsolutions.

关键词： stability reaction-advection-diffusion equations bistable time periodic tray- eling fronts

Analytical modeling for rapid design of bistable buckled beams

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Theoretical & Applied Mechanics Letters 2019年第4期9卷 264-272,I0003页

作者： Wenzhong Yan Yunchen Yu Ankur Mehta Samueli School of Engineering University of CaliforniaLos Angeles

Double-clamped bistable buckled beams demonstrate great versatility in various fields such as robotics,energy harvesting,and microelectromechanical system(MEMS).However,their design often requires time-consuming and expensive computations.In this work,we present a method to easily and rapidly design bistable buckled beams subjected to a transverse point force.Based on the Euler–Bernoulli beam theory,we establish a theoretical model of bistable buckled beams to characterize their snapthrough properties.This model is verified against the results from a finite element analysis(FEA)model,with maximum discrepancy less than 7%.By analyzing and simplifying our theoretical model,we derive explicit analytical expressions for critical behavioral values on the force-displacement curve of the beam.These behavioral values include critical force,critical displacement,and travel,which are generally sufficient for characterizing the snapthrough properties of a bistable buckled beam.Based on these analytical formulas,we investigate the influence of a bistable buckled beam's key design parameters,including its actuation position and precompression,on its critical behavioral values,with our results validated by FEA simulations.Our analytical method enables fast and computationally inexpensive design of bistable buckled beams and can guide the design of complicated systems that incorporate bistable mechanisms.

关键词： bistable buckled beam Theoretical model Snap-through characteristics Off-center actuation Analytical expression Rapid design

Fractal Basin Boundaries of Coexistent Attractors in an Optical bistable System

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Chinese Science Bulletin 1994年第13期39卷 1071-1073页

作者：杨援戴建华张洪钧

The dynamical behavior of an optical bistable system with a long delay in the feedback loop has been studied and experimentally demonstrated in detail However, not much attention has been paid to the dynamical behavior of that with a short-delay feedback. Dai et al. reported that the quasi-periodic motion exists in a hybrid optical bistable system with a short delay, but they did not study it further.

关键词： optical bistable chaos fractal.

A state-of-the-art review on low-frequency nonlinear vibration isolation with electromagnetic mechanisms

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Applied Mathematics and Mechanics(English Edition) 2022年第7期43卷 1045-1062页

作者： Bo YAN Ning YU Chuanyu WU School of Mechanical Engineering Zhejiang Sci-Tech UniversityHangzhou 310018China

Vibration isolation is one of the most efficient approaches to protecting host structures from harmful vibrations,especially in aerospace,mechanical,and architectural engineering,etc.Traditional linear vibration isolation is hard to meet the requirements of the loading capacity and isolation band simultaneously,which limits further engineering application,especially in the low-frequency range.In recent twenty years,the nonlinear vibration isolation technology has been widely investigated to broaden the vibration isolation band by exploiting beneficial nonlinearities.One of the most widely studied objects is the"three-spring"configured quasi-zero-stiffness(QZS)vibration isolator,which can realize the negative stiffness and high-static-low-dynamic stiffness(HSLDS)characteristics.The nonlinear vibration isolation with QZS can overcome the drawbacks of the linear one to achieve a better broadband vibration isolation performance.Due to the characteristics of fast response,strong stroke,nonlinearities,easy control,and low-cost,the nonlinear vibration with electromagnetic mechanisms has attracted attention.In this review,we focus on the basic theory,design methodology,nonlinear damping mechanism,and active control of electromagnetic QZS vibration isolators.Furthermore,we provide perspectives for further studies with electromagnetic devices to realize high-efficiency vibration isolation.

关键词： quasi-zero-stiffness(QZS) nonlinear vibration isolation low-frequency electromagnetic vibration isolation bistable

Recent advances in wave energy converters based on nonlinear stiffness mechanisms

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Applied Mathematics and Mechanics(English Edition) 2022年第7期43卷 1081-1108页

作者： Xiantao ZHANG Haicheng ZHANG Xiao ZHOU Ze SUN State Key Laboratory of Ocean Engineering Shanghai Jiao Tong UniversityShanghai 200240China College of Mechanical and Vehicle Engineering Hunan UniversityChangsha 410082China China Ship Scientific Research Center Wuxi 214082Jiangsu ProvinceChina

Wave energy is one of the most abundant renewable clean energy sources,and has been widely studied because of its advantages of continuity and low seasonal variation.However,its low capture efficiency and narrow capture frequency bandwidth are still technical bottlenecks that restrict the commercial application of wave energy converters(WECs).In recent years,using a nonlinear stiffness mechanism(NSM)for passive control has provided a new way to solve these technical bottlenecks.This literature review focuses on the research performed on the use of nonlinear mechanisms in wave energy device utilization,including the conceptual design of a mechanism,hydrodynamic models,dynamic characteristics,response mechanisms,and some examples of experimental verification.Finally,future research directions are discussed and recommended.

关键词： wave energy efficiency nonlinear stiffness hydrodynamics bistable