Two - segment distributed feedback ( dfb ) semiconductor lasers can achieve tuning with single longitudinal mode in a certain wavelength range ; at the same time , its superiority also includes bistablity and wavelength conversion 其中，两段式分布反馈( distributedfeedback ， dfb )半导体激光器可以在一定波长范围内实现单纵模、可调谐工作；同时，它还具有双稳、波长转换等功能。
Solving the rate equation numerically , the influence of the factor a and the reflectivity r on the transient characteristics of the ecld has been analyzed when the shape of the hysteresis loop looks like a parallelogram approximately 通过对速率方程组进行数值求解，分析了当ecld双稳环呈现近似的平行四边形时，谱线展宽因子和ld镀膜端面反射率r对双稳跳变瞬间动态特性的影响。
Thirdly , a unified colored - noise approximation is applied to calculate the steady state distributions of the dispersive optical bistability when the fluctuations in the amplitude and phase of the incident field are considered as colored noise 色散光学双稳系统是本文研究的第三种光学模型。当入射光中的强度涨落和位相涨落分别看作色噪声时，我们用统一色噪声近似得到它们的定态强度分布。
When there is a weak periodic signal is included in a bistable system , the effects of noise on the stochastic resonance in the system is investigated if both multiplicative and additive noise are white noise while the coupling between the two noise terms is colored noise 当双稳系统中包含有一个微弱的周期性信号，而乘性噪声和加性噪声都是白噪声，只有两种噪声之间的祸合为色噪声时，我们研究了系统的噪声对随机共振的影响。
In this way , supersonic fluid amplifier especially bistable valve with negative pressure switch is used in the rocket projectile thanks to its advantages of switching rapidly , the ability of low temperature air to control the high temperature gas and no moving parts in high temperature gas 超音速射流双稳阀，特别是采用负压切换的超音速射流双稳阀因其具有切换快速、可用低温气流控制高温燃气和在高温燃气中无活动部件的优点而适用于火箭弹的姿态控制系统中。
In some applications , for example in rocket engine , the simulation full three - dimensional model is necessary . finally , we explain the phenomenon in the experiment with the results of simulation and verify the dependability and accuracy of this numerical simulation through the co mparison with the experimental data 本文利用三维流场的计算结果合理地解释了实验中发生的现象，并通过与已有的实验数据的对比，验证了超音速射流双稳阀数值模拟的可靠性和准确性，有望应用于实际工程的初步设计。
Secondly , combining the unified colored noise approximation and the functional analysis , the steady state distribution function is derived when both multiplicative colored noise and additive white noise are included in a bistable system with colored coupling between two kinds of noise . through the two - state theory , the expression of signal - to - noise ratio ( snr ) is obtained . the phenomenon of stochastic resonance is investigated 其次，我们综合运用统一色噪声近似和泛函近似的方法，推导了含有乘性色噪声和加性白噪声，并且两种噪声之间的耦合为色噪声的双稳非线性系统的定态分布摘要不同类型的色噪声对非线性光学系统的影响函数，然后通过双态理论求出系统信噪比的解析表达式，对系统的随机共振现象进行分析。
In this thesis , the investigations of the application of stochastic theory in protein motor and fhn neuron model are systematically reported , which include four aspects : effects of random potential on motor protein transport ; noise - induced transition in a fhn neural model ; stochastic resonance in a bistable system subject to multiplicative and additive noise ; coherence and stochastic resonance in a globally coupled fhn neural model 现在我们集中报导对随机理论在生物马达蛋白和fhn神经模型上的应用所进行的一系列的研究，主要有以下四个方面：涨落势诱导生物马达蛋白输运；噪声诱导fhn神经模型相变：噪声关联对双稳系统随机共振现象的影响；全局耦合的fhn神经网络的随机共振和同步共振。
Compared with mechanics - electricity feedback control method , laser diode feedback control method and optical bistable equipment control method , the circuit is relatively simple , furthermore , simply adjust the optical system to increase the number of pixel corresponding to the interference pattern width , which will promote the control precision of the system 和已有的机电反馈控制方法、半导体激光器反馈控制方法、光学双稳装置控制方法相比，电路较为简单，而且，简单地调节光学系统使干涉条纹宽度对应的象素数增大，即可提高系统的控制精度。
Thus , we have deeply studied the applications of stochastic theory in protein motor and fhn neuron model , and obtained some important results , especially the opposing role of the amplitude and correlation strength in protein transport , the locked phenomenon in fhn neuron model , the dependence of the effect on initial condition , the phase transition and resonance in globally coupled neuron system 为此，我们对随机理论在生物马达蛋白和fhn神经模型上的应用进行了较深入的研究，取得了一些有重要意义的成果，特别是发现：涨落势的幅值和关联强度对蛋白输运起着相反的作用；噪声诱导fhn神经电位的锁定现象；噪声关联导致双稳系统对初始状态的记忆功能；噪声作用下全局耦合fhn神经网络的共振和相变现象。
