Based on the discreteness of electric charge, the influences of an external magnetic filed on the persistent current of the mesoscopic coupling metallic rings a re investigated.
在考虑电荷是量子化的基础上，研究了外加磁场对介观耦合金属环中持续电流的影响。
High voltage simulation tests were performed on the magnetic rings of three kind materials, i. e. ferrite, amorphous and microcrystalline and metallic magnetic powder core.
通过高电压模拟试验，观测了铁氧体、非晶磁芯和金属磁粉芯三种材料的磁环，特别观测了磁饱和的影响。
Metal elastic force ring inside piston rings can add initial elastic force of the non-metallic piston ring to get expectative seal effect.
在活塞环的内侧设置金属的弹力环增加非金属活塞环的预弹力，可到达预期的密封效果。
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