This method is different from usual method, we use the concept of electricflux and principle of superposition for the electric field.
与一般方法不同，本文利用电通量概念及电场叠加原理，推导出电场能量密度的普遍表达式。方法简明。
2
The result of the research indicates that the high performance concrete produced with this type of cement is of higher early and post strength and the electricflux of the concrete is low.
研究结果表明，应用该水泥配制的高性能混凝土均具有较高的早期强度和后期强度，混凝土的电通量较低。
3
Maxwell's equations conserve certain properties-the magnetic field intensity, the electric displacement field and the Poynting vector that describes the electricflux of an electromagnetic field.