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应用弹性波理论研究不同的空心Si纳米球弱耦合到半无限长的基底上在微扰近似下的振动态密度,结果发现在低频下耦合空心球的振动模有明显的展宽和改变.通过求解声子传播函数的Dyson方程得到空心球的振动态密度,并进一步研究了空心球的热力学性质. 相似文献
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Soliton structures in the (1+1)-dimensional Ginzburg–Landau equation with a parity-time-symmetric potential in ultrafast optics
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In this paper, the(1+1)-dimensional variable-coefficient complex Ginzburg–Landau(CGL) equation with a paritytime(PT) symmetric potential U(x) is investigated. Although the CGL equations with a PT-symmetric potential are less reported analytically, the analytic solutions for the CGL equation are obtained with the bilinear method in this paper. Via the derived solutions, some soliton structures are presented with corresponding parameters, and the influences of them are analyzed and studied. The single-soliton structure is numerically verified, and its stability is analyzed against additive and multiplicative noises. In particular, we study the soliton dynamics under the impact of the PT-symmetric potential. Results show that the PT-symmetric potential plays an important role for obtaining soliton structures in ultrafast optics, and we can design fiber lasers and all-optical switches depending on the different amplitudes of soliton-like structures. 相似文献
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In optical systems,it is necessary to investigate the propagation of optical solitons in optical fiber systems for fiber-optic communications.By means of the bilinear method,we obtain the two-soliton solution of the variable coefficient higher-order coupled nonlinear Schrodinger equation.According to the obtained two-soliton solution,a novel two-soliton interaction structure of the system is constructed,and their interactions are studied.Two optical solitons occur with elastic interaction under ... 相似文献
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对用力敏传感器测量液体表面张力系数仪器进行研究,重新设计了吊环,便于吊环的水平调节,对待侧液体表面均匀下降的方法和实验装置做了重新设计,减小了实验误差,同时增加了待测液体的变温控制,能够精确测量液体表面张力系数与温度的关系,扩充了实验内容. 相似文献
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《声速测定》是大学物理实验中比较普遍的一个综合性实验。在声速测定实验仪的基础上,改进了信号源,并制作了声悬浮配件,使其实现既可以用多种方式测量声速,又可演示声悬浮实验现象。声悬浮及声速测定实验仪悬浮稳定性强,声速测定准确,仪器造价低,使用方便,这样设计节省了实验室资源和空间。 相似文献
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We take the higher-order nonlinear Schr¨odinger equation as a mathematical model and employ the bilinear method to analytically study the evolution characteristics of femtosecond solitons in optical fibers under higherorder nonlinear effects and higher-order dispersion effects. The results show that the effects have a significant impact on the amplitude and interaction characteristics of optical solitons. The larger the higher-order nonlinear coefficient, the more intense the interaction between... 相似文献
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