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Since the 1980s, much progress has been made in the studies of fractals. The in-trinsic causes of fractals are gradually discovered and the research results are applied inmany fields. Usually, it is very difficult in real experiments to prepare an exactself-similar sample because of the special structure and the sensitivity to the experimental
Since the 1980s, much progress has been made in the studies of fractals. The in-trinsic causes of the fractals are gradually discovered and the research results are applied inmany fields. Usually, it is very difficult in real experiments to prepare an exactself-similar sample because of the special structure and the sensitivity to the experimental