圆柱形弹性壳液耦合系统大幅低频重力波振动机理的研究

以圆柱形弹性壳液耦合系统为研究对象,根据非线性振动理论,建立了多自由度的非线性振动方程。通过数值计算,发现当激振力足够大,且激振力的频率在壳体固有频率与重力波固有频率之和的一个窄频带内时,会产生大幅低频重力波。从而解释了这一现象产生的振动机理。理论结果与实验结果基本吻合。     

Wavelength-selective characteristics of high birefringence photonic crystal fiber with Au nanowires selectively filled in the cladding air holes

Filter characteristics of a designed gold-filled high birefringence photonic crystal fiber are investigated based on the finite element method. The wavelength filter resonances in the high birefringence photonic crystal fiber occur at different points for different polarized directions, and the resonance strength in the x-polarized case is much weaker than that in the y-polarized case. The much more obvious splitting filter characteristics and different resonance strength imply the study and application values in splitting and single polarization fiber devices. The simulation results show that increasing the number of the gold wires only enhances the resonance strength when there is no surface plasmon supermode formed. With the diameters of the gold wires increasing, the response wavelength moves to a longer wavelength, and the strength becomes stronger. When the diameter is increased to 1.4 μm, the response wavelength in the x-polarized case can be tuned to 1.318 μm, which is the communication wavelength. The strongest resonance occurs at 1.2375 μm in the y-polarized case, and the peaking loss can reach 435.83 dB/cm.     

圆柱形弹性壳液耦合系统大幅低频重力波的解析分析

以圆柱形弹性壳液耦合系统为研究对象,对已建立的多自由度非线性振动方程用平均法求其近似解析解,得到了方程组的一次近似定常解结果,由此可知当液固耦合系统受到激振力足够大,且激振频率处于弹性壳体的固有频率和重力波频率之和的一个窄频带范围时,液面以高频为主的振动会转化为以低频为主的大幅重力波运动,这是一种组合共振现象.     

改进GA机制融合的二进制蜂群算法研究

为了克服人工蜂群算法蜜源更新过程中的随机性并保留蜜源中个体序列合理的组合形式,通过分析基本蜂群算法更新公式的机理,提出一种改进GA(Genetic A1gorithm)机制融合的二进制蜂群算法.算法以二进制编码,首先依概率对任意两蜜源进行"去同存异"操作后随机排列,将排列结果放入到其中某个体中形成新个体.然后依概率进行二进制个体的"翻转"操作,上述两种操作从其本质上相当于GA的类交叉和类变异操作;其次利用GA机制收敛性的证明方式在理论上证明算法是收敛的.最后通过应用不同特性的多维基准函数和算法之间的比较验证改进蜂群算法具有良好的收敛能力和鲁棒性.     

High stability supercontinuum generation in lead silicate SF57 photonic crystal fibers

We report supercontinuum (SC) generation in a lead silicate SF57 photonic crystal fiber by using a 1550 nm pump source. The effective nonlinear coefficient of the SF57 fiber is simulated to be 111.5 W-1 ·km-1 at 1550 nm. The fiber also shows ultraflat dispersion from 1700 nm to 2100 nm. Our results reveal that with an increase of the average power of the incident pulse from 10 mW to 90 mW, the SC of the SF57 photonic crystal fiber is generated from 1300 nm to 1900 nm with high stability and without significant change in spectral broadening.     

基于语言变量模糊评价的可信软件非功能需求权衡模型

提出了一个模糊定性定量的软目标相互依存图FQQSIG模型(Fuzzy Qualitative and Quantitative Softgoal Interdependency Graphs)来分析可信软件(Trustworthy Software,TS)中的非功能需求(Non-Functional Requirements,NFRs)的相关性.首先描述了一个NFRs层次分解图,专家团队并对NFRs的重要性程度进行语言变量形式的模糊定性评价,然后再用梯形模糊数和RAGE(RAndom GEneration)随机仿真算法来完成定性到定量数据的转化,最后再提出关系矩阵算法实现NFRs节点贡献值的计算以及应用FQQSIG模型进行NFRs节点权衡.     

超小型带宽可调谐微环谐振腔（英文）

基于狭缝波导和热光学调制的耦合特性,提出一种尺寸为15μm×20μm的绝缘硅基底的超小型微环谐振器,该器件可通过调节加热器功率调节其带宽.用时域有限差分法模拟其可调谐特性,结果表明,当加热器功率从0mW增加至0.742mW时,1550nm入射光的TE模式在1 900nm波长下的带宽可调范围为2.5nm,TM模式在1 543nm波长处的带宽可调范围为3.1nm.该器件尺寸小、驱动功率低、可调谐带宽范围大,适用于动态集成光信号处理,如重构滤波和布线等.