Eden model: sites where the new particles will have a neighbor get occupied randomly (with equal probability, or some modification thereof) Peter Kratzer Fritz-Haber-Institut der MPG, Berlin, Germany

http://en.wikipedia.org/wiki/Power_spectral_density

from 21st century business school http://www.kaburaya-group.co.jp/

異化効果 http://www.britannica.com/eb/article?eu=502