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建立三角形区域双寡头Hotelling博弈模型,研究了具有不同价格竞争策略的复杂动力学问题.当某些参数发生变化时,会打破系统的纳什均衡,出现分岔、混沌、吸引子和初始条件敏感依赖性等动力学行为,计算了其分形维数.结果表明,采用OYG控制方法,可实现良好的混沌控制效果,使市场回归稳定. 相似文献
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平面波导型对称星型耦合器的优化设计 总被引:2,自引:1,他引:1
通过有限差分波束传播法(FD-BPM)研究了N×N平面波导型星型耦合器的优化设计思想和方法,并通过17×17星型耦合器的模拟设计证明了它的可行性.给出了在输出端引入辅助波导的方法,以提高输出波导阵列的均匀性.并通过模拟计算,分析了圆心缩入程度和锥形区的形状对输出结果的影响.此法也同样适合于N值更大的星型耦合器. 相似文献
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Studies using electrophysiological and HRP-labeling techniques showed that the lateral border ofphysiologically determined primary visual cortex coincides with the cytoarchiectonically defined area 17/18a border. The dense callosal projections are distributed in a zone, about 1.5 mm wide, along this border,which lies in the callosal zone, about 1/4-1/3 of the zone width from its lateral limit. There are tworepresentations of the vertical meridian of the visual field, one in the proper of area 17, about 1/3 ofthe zone width from its medial limit, the other in area 18a, at about the lateral zone limit. 相似文献
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针对由复杂结构振动形成的封闭空间声场,提出了一种基于等效源法的面板声学贡献度分析方法。该方法首先利用基于等效源法的内部声全息技术,重构出振动结构表面的法向振速并实现对整个内部封闭声场的预测。再将振动结构的每个面板在腔体内部场点产生的声压分别用位于空腔表面附近的等效源在该点产生的辐射声压代替,将复杂的封闭非自由声场问题转化为简单的内部自由场问题,结合重建出的结构表面法向振速进而识别出封闭振动结构各面板对腔体内任意位置的声学贡献度。通过对复杂结构内声场的数值仿真和验证实验,分析了等效源的数量及与重建面距离等参数对重建精度的影响,结果表明所提方法不仅能够达到传统数值分析方法的计算精度,而且具有更简单的求解过程。 相似文献
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一种级联马赫-曾德尔滤波器设计的新方法 总被引:8,自引:2,他引:6
级联马赫—曾德尔干涉仪滤波器可实现平顶化的滤波器频谱响应,但是利用传统的传输矩阵法。并不能方便地得到级联马赫—曾德尔干涉仪滤波器中各耦合器的耦合系数。将级联马赫—曾德尔干涉仪滤波器与数字信号处理中的有限脉冲响应滤波器进行了类比,并将数字滤波器的设计方法引入到级联马赫—曾德尔干涉仪滤波器的设计中,将滤波器的传输函数表示成为各耦合器耦合系数的显式函数,同时利用遗传算法,计算了对于给定的滤波器频谱响应,级联马赫—曾德尔干涉仪光滤波器中各耦合器的耦合系数。通过实例证明了利用数字滤波器的设计方法及遗传算法设计级联马赫—曾德尔干涉仪光滤波器,不仅可以得到理想的结果,而且可以提高光滤波器的设计效率。 相似文献
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The structure of retina of the Lipotes Vexillifer has been studied quantitatively under light microscope. The results obtained are as follows.(ⅰ) The thickness of the retina is 268 μm. The lamination of retina can be clearly distinguished. It consists of 10 layers. The thicknesses of the layers from pigment epithelium to internal limiting membrane are 12 μm, 44 μm, 2 μm, 48 μm, 20 μm, 36 μm, 68 μm, 32 μm, 8 μm and 2 μm respectively.(ⅱ) The number of cells in the outer nuclear layer is larger than that in the inner nuclear layer. Two types of cell can be distinguished in this layer. The number of receptors and ganglion cells is in a ratio of 12 to 1. These results show that the retina type of the Lipotes corresponds to that of nocturnal animals.(ⅲ) The diameters of ganglion cells range 1.5—37 μm with two peaks at 6 μm and 35 μm. This means that the ganglion cells fall into two groups according to size, and this has been proved by the observation on morphology of ganglion cells in the wh 相似文献
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The retinotopic map for the contralateral eye is similar to that found in the pigmentedrats and in other rodents. Cells which had ipsilateral responses were recorded in a fairlylarge area in tale rostral portion of the tectum. Their receptive fields lay from about 40°in the contralateral hemifield to about 40°in the ipsilateral hemifield. The ipsilateral re-sponse of a binocular cell is similar in almost every respect to its counterpart in the oppositeeye except being very weak and that the receptive field is usually smaller. Most binocularcells are distributed in the Stratmn grisemn superfieiale (SGS) and the Stratum optieum (SO).Less binocular cells recorded in the Stratum griseum intermediale (SGI) have moro scatter-ed distribution both in the size and in the position of the receptive field. 相似文献