以下为句子列表：
英文: Abstract: It is observed that the Sommerfeld's formula for a progressive spherical wave is not covariant with respectro the rotation of the coordinate system.It contains complex partial waves that are not physical.The standing wave representation of the s
中文: 文摘:说明了球面行波的索末菲公式在坐标转动下不协变.证明了球面波的驻波表示是协变的，因而是一个物理的关系式，故适用于圆柱坐标中各类波动方程的定解问题.作为一个例，应用于光纤光学，导出了受导简正模和辐射模的表达式，以及各模式的强度分布.
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英文: The conclusion that the electromagnetic field is a covariant entia is drawn from the analysis of the forces acting on a moving charge beside a straight carrying wire in several frame of references by special principle of relativity.
中文: 摘要利用狭义相对论分别对同一载流直导线外一个运动电荷的受力情况在几种常用的参考系中分析，得出电磁场是一个协变的统一体的结论。
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英文: The instantonlike and meronlike vacuum solutions of conformally covariant nonlinear coupled scalar and spinor field equations are discussed.
中文: 我们讨论了标量-旋量共形协变非线性耦合方程的instantonlike和meronlike真空解。
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