共查询到20条相似文献,搜索用时 125 毫秒
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《中国光学与应用光学文摘》2005,(4)
O437 2005042695 状态反馈控制声光双稳系统的倍周期分岔和混沌=Con- trol of period-doubling bifurcation and chaos in acousto-op- tical bistable system by the feedback of states[刊,中]/吕翎(辽宁师范大学物理系,辽宁,大连(116029)),杜增…//光子学报,-2004,33(11),-1401-1404 设计了一种动力学状态反馈(DSF)方法控制非线性混沌系统。介绍了DSF方法的控制原理,并用此方法控制声光双稳(AOB)系统的混沌,以此验证其有效性。仿真模拟显示,通过选择恰当的控制参数,有效地实现了声光双稳 相似文献
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电光双稳系统中动态存储最高谐波数的研究 总被引:1,自引:1,他引:0
从带有延时反馈回路的混合型电光双稳系统的动力学方程及差分方程出发,数值计算并分析了长延时下该系统存在的动态存储的最高谐波数。研究并讨论了系统的延迟时间,消光系数,输入光强和初相移对动态存储最高谐波数的影响,指出开发利用系统动态存储功能的途径。 相似文献
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声光双稳系统的混沌同步 总被引:6,自引:0,他引:6
首先给出布拉格型声光双稳系统耦合驱动的混沌同步化方案,用最大条件Lyapunov指数分析方法得出耦合驱动下系统混沌输出同步化条件,发现通过适当比例的耦合驱动可以使两组混沌系统达到同步的混沌输出。分析此混沌同步化方案可以抵抗噪声的干扰,并且在两系统出现偏差时仍可以实现混沌同步,找到了实用的单变量延时微分系统非Pecora-Carroll规则的混沌同步化方案。最后做了实验验证。 相似文献
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The hybridizations of a graphene layer by a thymine and a uracil nucleobase have been investigated by performing density functional theory (DFT) calculations. The isolated and hybrid structures have been firstly stabilized to reach the minimum energy and the electronic properties have been subsequently evaluated for the optimized structures. The structural and atomic scale parameters indicated that the tip of graphene is important in determining the properties of new hybrids. Moreover, different effects of thymine and uracil nucleobases have been identified in the hybrid structures. Quadrupole coupling constants have been evaluated to characterize the atomic scale properties, in which the most notable effects of hybridizations have been observed for the atoms close to the linking regions whereas negligible effects have been seen for other atoms. 相似文献
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The deflagration-to-detonation transition in hydrogen–air mixtures that fill spiral channels has been studied. A spiral channel has been produced in a cylindrical detonation tube with a twisted ribbon inside. The gas mixture has been ignited by means of a spark gap switch. The predetonation distance versus the twisted ribbon configuration and molar ratio between the gas mixture components has been determined. A pulling force exerted by the detonation tube after a single event of hydrogen–air mixture burnout has been found for four configurations of the twisted ribbon. Conditions under which the use of a spiral tube can be more effective (increase the pulling force) have been formulated. 相似文献
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An optically addressed parallel-aligned nematic-liquid-crystal spatial light modulator (PAL-SLM) has been studied as a dynamic phase-only modulation device. A computer control feature of the spatial light modulator is strongly desired for practical applications. For those demands, an electrically-addressable phase-only spatial light modulator has been developed to combine a liquid crystal display (LCD) with a PAL-SLM (LCD-coupled PAL-SLM) and its performance has been reported. However, a temporal characteristic especially two-dimensional (2D) response has not been discussed before. In this paper, 2D response analysis system has been constructed by using a high-speed complementary Metal-Oxide-Semiconductor (CMOS) camera (1000 frames/sec) and the 2D-modulation characteristic of the LCD-coupled PAL-SLM has been observed. As a result, the LCD has a spatially non-uniform modulation characteristic due to a scanning addressing. It has the potential to cause problems in high speed switching for a computer generated hologram. On the other hand, the spatial non-uniformity has not been observed with the LCD-coupled PAL-SLM. 相似文献
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Miklós Kuczmann 《Physica B: Condensed Matter》2011,406(8):1403-1409
The paper presents a Preisach model to simulate the vector hysteresis properties of ferromagnetic materials. The vector behavior has been studied using a single sheet tester with a disk-shaped specimen at low frequency. The locus of the magnetic flux density vector has been controlled by a digital measurement system. An inverse vector Preisach hysteresis model has been developed and identified by applying the measured data. Finally, the inverse model has been inserted into a finite element procedure through the fixed point technique and the reduced magnetic scalar potential formulation to simulate the measurement system. The applicability of the measurement system as well as the developed model has been proven by comparing measured and simulated results. 相似文献
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Entanglement has been explored as one of the key resources required for quantum computation, the functional dependence of the entanglement measures on spin correlation functions has been established, correspondence between evolution of maximally entangled states (MES) of two-qubit system and representation of SU(2) group has been worked out and the evolution of MES under a rotating magnetic field has been investigated. Necessary and sufficient conditions for the general two-qubit state to be maximally entangled state (MES) have been obtained and a new set of MES constituting a very powerful and reliable eigen basis (different from magic bases) of two-qubit systems has been constructed. In terms of the MES constituting this basis, Bell’s States have been generated and all the qubits of two-qubit system have been obtained. It has shown that a MES corresponds to a point in the SO(3) sphere and an evolution of MES corresponds to a trajectory connecting two points on this sphere. Analysing the evolution of MES under a rotating magnetic field, it has been demonstrated that a rotating magnetic field is equivalent to a three dimensional rotation in real space leading to the evolution of a MES. 相似文献
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E. M. Baitinger E. A. Belenkov M. M. Brzhezinskaya V. A. Greshnyakov 《Physics of the Solid State》2012,54(8):1715-1722
The experimental results of a comprehensive investigation of the structure of detonation synthesis nanodiamonds by electron microscopy methods have been presented. The morphology of diamond nanoparticles has been investigated and the microdiffraction patterns have been analyzed. The method of characteristic fast electron energy loss spectroscopy in transmission electron microscopy has been used. The local density of structural components of a nanodiamond (diamond core and fullerene-like shell) has been obtained. The shape of the shell surrounding the nanocrystal has been determined using model calculations. A hypothesis explaining the charging of the nanodiamond surface has been proposed. 相似文献
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In this paper, evaporation waves appearing at rapid depressurization of a vessel filled with liquid Freon R11 have been investigated
experimentally. Regimes with a high-speed evaporation front have been revealed. It has been shown that the disintegration
of a metastable liquid takes place in the form of a surface evaporation wave with a cellular structure of the front and anomalously
high values of the coefficient of heat transfer from the liquid. The dependence of the evaporation front velocity on the initial
temperature of the liquid has been obtained. A critical temperature value below which evaporation waves are not observed has
been determined. Visualization of the evaporation front structure and dynamics with the use of a high-speed video camera has
been performed. It has been found that the evaporation front motion has a pulsatory character. A method to calculate the surface
evaporation wave with a quasi-plane interphase boundary has been developed. It is based on a model of nonequilibrium evaporation
of the liquid and experimentally measured coefficients of the heat transfer from the liquid. 相似文献
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The approaches of [1. and 2.] and [3. and 4.] have been incorporated to develop a procedure for the automatic computation of the eigen-values and the eigen-functions of one-dimensional linear Sturm-Liouville boundary value eigenproblems, both singular and nonsingular. The continuous coefficients of a regular Sturm-Liouville problem have been approximated by a finite number of step functions. In each step the resulting boundary value problem has been integrated exactly and the solutions have then been matched to construct the continuously differentiable solution of the original problem and the corresponding eigencondition. Step sizes have been chosen automatically so that the local error has been held in a predetermined interval. Representative test examples have been computed to illustrate the accuracy, reliability, and efficiency of the algorithm proposed. 相似文献
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The hardware and the communication protocol of a scalable optical ring have been designed. A hardware routing has been achieved on the network interface card to minimize data packet communication latency and a simplified communication protocol has been designed to reduce communication overheads. To reduce the data packet blocking probability and have a more efficient usage of the data link layer bandwidth, a virtual multi-channel transmission mechanism has been achieved. The network supports a maximum of 16 virtual channels for each physical data link. Time slots can be dynamically assigned to each virtual channel. Zero wait time has been achieved for the switching between different virtual channels. 相似文献
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《Chinese Journal of Lasers》2001,(6)
1 Introduction High performance parallelcomputingplatformmadeupofworkstationsorpersonalcomputersinterconnectedbynetworkhasbecomethemainstreaminthedevelopmentofparallelcomputingtechnology[1] .Currently ,computerclustersaremainlyinterconnectedbylocalareane… 相似文献