It is found that the energy band of the well slab submerged into the band gap of barrier slab is discretized into resonant modes and the number of the resonant modes changes with the well slab thickness.
用基于平面波的传输矩阵法分析由具有不同晶格常数的光子晶体材料构成的光量子阱结构中的共振模,发现湮没于垒层的阱层能带分离成共振模,且共振模的数目随阱层的厚度变化而改变。
As a weak disorder is introduced, there will be a resonant mode in the gap, and electromagnetic waves with resonant mode frequency can propagate in the structure, while they can not propagate in the one with no disorder.
应用on -shell方法研究弱无序情况下的二维光子晶体 ,无序的引入使得原来不透电磁波的禁带中 ,出现了共振模 ,即某一波长的电磁波可以透过 ,计算结果表明共振模的出现位置 ,条数多少及透过率随着无序程度的不同而变化。
Study on vibration isolation modules (VIM) in a towed array sonar;
拖曳线列阵声纳中隔振模块研究
The VIM(vibration isolation module) is one of the most important components in towed array sonar.
隔振模块是拖曳线列阵的重要组成部分,本文采用ANSYS有限元软件,建立了考虑护套内硅油和护套外水这两种流体的两层流固耦合模型,计算分析了隔振模块在水下的隔振性能,得到了一些重要的分析结果。
In the light of the projection operator technique, the normal vibrational modes are determined.
根据投影算子技术确定了简振模,我们分析了所得结果并给出了合理的解释。
Withe the perturbation method,the analytical expressions ofthe fundamental mode field and the propagation constant are given,Two resultsare brought about:(1)the fundamental modes in a single-mode helical fiber areright-rotated and left-rotated circularly polarised modes.
结果表明：（１）单模螺旋光纤的基模是右旋和左旋圆偏振模；（２）螺旋光纤基模间的传播常数之差为２τ。
Two important results are obtained: (1) The guided modes in abelical fiber are right-rotated or left-rotated circularly polarised modes.
从波动方程出发，直接在本地坐标系（Ｓｅｒｒｅｔ－Ｆｒｅｎｅｔ框架）中研究了任何各向同性折射率分布的圆形芯弱导螺旋光纤导模的特性，得到两个重要的结论：（１）螺旋光纤的导模只能是右旋或左旋圆偏振模；（２）螺旋光纤不能传输ＴＥ模和ＴＭ模。