Memristive neuron model with an adapting synapse and its hardware experiments

Electromagnetic induction effect caused by neuron potential can be mimicked using memristor. This paper considers a fluxcontrolled memristor to imitate the electromagnetic induction effect of adapting feedback synapse and presents a memristive neuron model with the adapting synapse. The memristive neuron model is three-dimensional and non-autonomous. It has the time-varying equilibria with multiple stabilities, which results in the global coexistence of multiple firing patterns. Multiple numerical plots are executed to uncover diverse coexisting firing patterns in the memristive neuron model. Particularly, a nonlinear fitting scheme is raised and a fitting activation function circuit is employed to implement the memristive mono-neuron model. Diverse coexisting firing patterns are observed from the hardware experiment circuit and the measured results verify the numerical simulations well.     

Dynamics analysis of chaotic circuit with two memristors

Based on Chua’s chaotic oscillation circuit, a fifth-order chaotic circuit with two memristors is designed and its corresponding dimensionless mathematic model is established. By using conventional dynamical analysis methods, stability analysis of the equilibrium set of the circuit is performed, the distribution of stable and unstable regions corresponding to the memristor initial states is achieved, and the complex dynamical behaviors of the circuit depending on the circuit parameters and the memristor ini...     

A method for static aeroelastic analysis based on the high-order panel method and modal method

A method for static aeroelastic analysis based on the high-order panel method and modal method is presented. The static aeroelastic characteristics of flexible wings are investigated using this method. Three-dimensional aerodynamic models of flexible wings are constructed based on the geometry of wing configuration, and the modal method is adopted to achieve the fluid-structure coupling. The static aeroelastic characteristics of the AGARD445.6 wing and a low-aspect-ratio wing are investigated in this study....     

Windows98的内置网络结构体系研究

本文对Ｗｉｎｄｏｗｓ９８操作系统的内置网络进行了剖析,从内部将其网络结构体系与ＩＳＯ的ＯＳＩ参考模型做了比较分析,给出了Ｗｉｎｄｏｗｓ９８内置网络的分层结构图,并描述了各层的作用和功能。     

Reduced-order H_∞ filtering for navigation with carrier phase

A reduced-order H∞filtering algorithm for navigation with carrier phase is presented.By taking advantage of decoupling between filtering states in a navigation solution,this algorithm reduces computational cost and is robust in colored noise.Furthermore,the estimation precision is also improved by taking ambiguities as nuisance states when the filtering process converges.Applications to kinetic simulations under diferent noise are presented to demonstrate robustness and efciency of the algorithm.     

Memristor initial-boosted coexisting plane bifurcations and its extreme multi-stability reconstitution in two-memristor-based dynamical system

Initial-dependent extreme multi-stability and offset-boosted coexisting attractors have been significantly concerned recently.This paper constructs a novel five-dimensional(5-D) two-memristor-based dynamical system by introducing two memristors with cosine memductance into a three-dimensional(3-D) linear autonomous dissipative system. Through theoretical analyses and numerical plots, the memristor initial-boosted coexisting plane bifurcations are found and the memristor initial-dependent extreme multi-stability is revealed in such a two-memristor-based dynamical system with plane equilibrium. Furthermore, a dimensionality reduction model with the determined equilibrium is established via an integral transformation method, upon which the memristor initial-dependent extreme multi-stability is reconstituted theoretically and expounded numerically. Finally,physically circuit-implemented PSIM(power simulation) simulations are carried out to validate the plane offset-boosted coexisting behaviors.     

Discrete memristive neuron model and its interspike interval-encoded application in image encryption

Science China Technological Sciences - Bursting is a diverse and common phenomenon in neuronal activation patterns and it indicates that fast action voltage spiking periods are followed by resting...     

Flatness maintenance and roughness reduction of silicon mirror in chemical mechanical polishing process

As an important optical component in laser system, silicon mirror surface is required to have micron-level flatness and subnanometer-level roughness. The research concentrates on how to improve roughness as far as possible while maintaining flatness of silicon mirror surface during chemical mechanical polishing(CMP) process. A polishing edge effect model is established to explain the reason of flatness deterioration, and a roughness theoretical model is set up to get the limit of perfect surface roughness. Based on the models above, a polishing device is designed to maintain the surface flatness, and the optimized polishing process parameters are obtained by orthogonal tests to get a near-perfect surface roughness. Finally the maintenance of flatness and the improvement of roughness can be achieved at the same time in one step of CMP process. This work can be a guide for silicon mirror manufacture to improve optical reflection performance significantly.     

深基坑止水帷幕事故分析及处理实例

本文通过工程实例，对目前高层建筑深基坑支护止水失效的原因和处理方法进行了分析和探讨，并根据工程经验提出了几点建议，供有关技术人员参考借鉴。