麦克斯韦方程中有某些特性是恒定不变的——磁场强度、电位移场以及描述电磁场电通量的坡印廷矢量。
Maxwell's equations conserve certain properties-the magnetic field intensity, the electric displacement field and the Poynting vector that describes the electric flux of an electromagnetic field.
利用麦克斯韦方程组和场的轴对称性，分别对含不稳定电荷源和不稳定电流源的轴对称非静态空间电磁场进行了研究。
By using the Maxwells equations and axial symmetry, the axial symmetric unstable electromagnetic field with unstable charge source and unstable current source is studied.
从麦克斯韦方程出发，严格推导了空间电荷波模式的色散关系，绘制了波导内的场型图。
From Maxwell's equations, the dispersion relation of space charge mode is strictly deduced, and the field pattern is studied.
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