Based on the fractal theory and method, the reduction of dimension value before strong earthquake occurrence for self-similar earthquake distribution in time and space has been discussed.
基于分维理论和方法，讨论了自相似的地震时空分布的分维和强震前的降维现象。
The method removes impurities by synthesis process and self-reduction process of the catalyst and realizes metallization of the active component and high dispersion.
本法通过催化剂的合成和自还原过程去除了杂质，实现了活性组分的金属化和高分散化。
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