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A NON-ADIABATIC MODEL OF SINGLE BUBBLE SONOLUMINESCENCE 总被引:1,自引:0,他引:1
A non-adiabatic model of single bubble sonoluminescence has been advanced through considering the energy dissipation caused by light emission. The bubble dynamical equations with a black-body radiation have been solved numerically. The results show that without introduciag any model parameter, this model not only can well reproduce the experimental phenomena in the time scale of microsecond of the adiabatic model can do, but also can obtain a 40-100 ps of flash duration and a 104 K effective temperature of the black-body radiation. These agree with the experiment quite well. 相似文献
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压电扬声器驱动的热声制冷机中阻抗匹配研究 总被引:1,自引:1,他引:0
为了减小热声制冷机的体积,在热声系统中,采用具有较高工作频率的压电扬声器作为驱动源,因此,压电扬声器与热声谐振管的匹配成为研究和改进此类热声制冷系统性能的重要因素。采用电力声等效电路的方法,推导出扬声器输出声功率和电声转换效率的表达式,并为获得高声功率和高制冷效率,对扬声器和谐振管结构以及工作频率进行优化。结果表明,谐振管的谐振频率即为系统的最佳工作频率,而当系统总的抗性为零时,扬声器输出较大的声功率。然而系统效率与输出声功率不能同时达到最大值,因此在实际应用中只能采取折中的效果。 相似文献
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孤子运动的Miles方程是一个具特征的非线性Schrdinger型方程.借求孤子解的微扰法,导出所遵循的矩阵方程,和孤子解的修正量δu(x,λ).并据双孤子解,计算了它的周期互作用状态 相似文献