双稳

• The equivalent cavity model is used to deduce the threshold condition of the ecld , and the expression of the threshold carrier density n ( v ) when ecld is tuned to oscillate at different frequencies has been obtained . using the expression of n ( v ) and the carrier dependent refractive index , the simple basic equation describing the bistable characteristics has been derived after choosing an appropriate reference frequency nf
  通过建立等效腔模型来推导外腔半导体激光器的阈值条件，得到ecld在不同频率v振荡所需的阈值载流子密度n ( v )表达式，利用该表达式及相关的折射率表达式，在选择合适的参考载流子密度n _ f后，导出了一个描述双稳所需的基本方程。
• Otherwise , a bi - stable nonlinear system can be connected to the matched filter , and by adjusting the system parameters , the system will keep in single state for the detection of binary or multi - nary code , so that the detection performance can be remarkably improved in a wide range of sampling period
  如果匹配滤波器的采样周期没有达到理想情况，则在它之前连一个双稳势的非线性系统，然后选择合适的参数使此系统始终处于单稳态，再对二进制或多进制码元信号进行检测，即使采样周期变化程度较大，检测性能也会得到显著的改善。
• And then , in the simulation of three - dimensional , the application of o - type grid and hybrid grid are used in two relatively complicated structures make the total amounts of grids and the time of grid generation reduced greatly . moreover the hexahedron grids are placed in most areas to provide higher precision . through the comparison between the results of two - dimensional and three - dimensional simulation , we knew two - dimensional calculating is not adequate
  本文用简单、方便的二维模型作为数值计算的起点，使用耦合隐式算法以及先进的v2f湍流模型进行求解，成功地捕捉到了激波，观察到主气流从壁面的分离、切换、再附壁等现象，并对计算结果进行了细致的分析，得出一些有意义的结论；在此基础上，本文在国内外首次对超音速射流双稳阀的三维流场进行了计算。
• Tunable external cavity semiconductor lasers ( ecld ) are useful for generating frequency tunable laser radiation of narrow spectral width , and providing important system for studying interactions between light and matters the dynamic and static characteristics of the bistable output of an ecld have been studied in this work under the condition of strong feedback
  外腔半导体激光器( ecld )可以产生可调谐的窄线宽激光输出，它也为研究光与物质的相互作用提供了一个重要的场所。本文研究了强反馈条件下外腔半导体激光器调谐输出的双稳动静态特性。
• Because quasi - fermi levels of a laser diode ( ld ) vary with the carrier density , it is predicted that a new type of hysteresis loop should occur for the current passing ld while a hysteresis loop appears on the power - frequency curve of the ecld . an explicit analytical expression for the frequency width of the hysteresis loop and the condition for the formation of the hysreresis loop has been deduced
  预测了由于半导体激光二极管( ld )的准费米能级之差随ld内线流子密度的变化而变化，因而，在调谐外腔半导体激光器的输出功率?振荡频率曲线上出现双稳环的时候，通过ld的电流也应出现一个伴随的新型双稳环? ?电流双稳环。
• Wide band - gap ii - vi materials , such as znse , znte and their alloys attract much attention due to their potential applications in light - emitting devices ( leds ) , laser diodes ( lds ) , optical bistable and optical nonlinear devices operqtynw in blue - green spectrum range for the fact that they exhibit large band gap and high exciton binding energy
  宽带-族半导体材料，尤其是znse和znte及其合金具有宽带隙、直接带跃迁、激子束缚能大等优点而作为蓝和蓝绿发光、激光以及在该波段响应的光学双稳和光学非线性的重要候选材料。
• Two different kinds of approximate theories for analyzing colored noise are employed in the nonlinear system . then effects of the colored nature of the noise on the statistical properties of the laser system , the stochastic resonance of bistable system , and the steady - state probability current of quasi - periodic system are investigated
  本文主要通过两种不同的色噪声近似理论，分析了非线性系统噪声的有色性对激光系统的统计性质、准周期性系统的定态几率流和双稳系统中的随机共振现象的影响。