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The weakly nonlinear boundary value problem of wave propagation in an optical fibere(for the transverse electric mode,for example)is formulated and a modified linear solution is obained.It is shown that a self-consistent theory of fibre optics should be weakly nonlinear,The mode of critical refraction that does not exist in the linear theory is obtained,showing that it is a mode consisting of resonance modes,It is shown that the signal carriers in a long fibre are of resonance modes,not normal modes,Some experimental data are given for comparison with the theoretical predictions and the agreement seems satisfactory. 相似文献
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我们构造了一手征对称的π去MIT-袋模型. 求出球对称的π场经典解, 重新计算了强子袋质量谱. 计算了Δ++(1236)的衰变宽度和P33πN相移δ33, 与实验符合得很好. 相似文献
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把满足约束Pi2—mi2—U(x2)=0(i=1,2)的二质点组的相对论力学应用于介子的SU(4)层子模型。在U(x2)为无限深球方势阱情况下,导出介子的质量谱。得到一组较精确的线性的质量关系。对于O-介子,代替η’—ηs混合,提出了η’—ηc混合的猜测。指出瑞奇轨迹对J—M2直线有系统地偏离,得到新的轨迹为M2对ξnl2的直线,其中ξneπ为球贝塞尔函数的零点,l为轨道角动量,新轨迹与实验数据符合较好。 相似文献
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