By using a concise method, the charge distribution on the surface of a thick spherical conducting shell revolving in a homogeneous magnetic field is obtained.
用简单方法求出了在均匀磁场中旋转的导体厚球壳上电荷的分布，证明了在磁场中转动的导体表面电荷分布无普遍公式。
The results of transmission electron microscopy(TEM) showed that the grain of strontium titanate powder prepared was spherical and the grain sizes distribution were homogeneous.
通过TEM分析可以看出，制备的钛酸锶粉体材料的颗粒为球形，并且颗粒大小均匀。
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