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首页> 外文期刊>Journal of Theoretical Biology >The fourth moment of the radial displacement of a discrete correlated/persistent random walk.
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The fourth moment of the radial displacement of a discrete correlated/persistent random walk.

机译:离散相关/持续随机游动的径向位移的第四矩。

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Dear Editor,An exact closed form solution to the fourth radial moment, , of a correlated/persistent random walk is reported here, where the expected mth radial displacement = integral from 0 to infinity R~mf (R)dR, and f(R) is the probability density function of the radial displacement R. This is the analytic expression for the true mean of the 4th power of the net distance from the origin following a correlated/persistent random walk. The solution reported here contradicts a previously reported result which appears to be mathematically incorrect.Correlated/persistent random walk models have been used to describe a wide range of phenomena including insect movements (Karieva and Shigesada, 1983), population dynamics (Skellam, 1973), foraging patterns (Root and Karieva, 1984; Cain, 1985; Turchin, 1991), animal dispersal (Kitching, 1971; Byers, 2000), spread of plants (Okubo and Levin, 1989), cell migration (Nossal and Weiss, 1974), microbial transport (Li et al., 1996), even polymer chain dynamics (Tchen, 1952, Bracher, 2004). For more extensive reviews, see Berg (1983), Weiss (1994) or Codling et al. (2008).
机译:亲爱的编辑:此处报告了相关/持续随机游走的第四个径向矩的精确闭式解,其中预期的第m个径向位移 =从0到无穷大R〜 mf(R)dR和f(R)是径向位移R的概率密度函数。这是在经过相关/持续随机游走之后,距原点的净距离的4次幂的真实均值的解析表达式。这里报道的解决方案与先前报道的结果在数学上似乎是不正确的相矛盾。相关/持久的随机游走模型已被用来描述各种现象,包括昆虫的活动(Karieva和Shigesada,1983),种群动态(Skellam,1973)。 ,觅食模式(Root和Karieva,1984;该隐,1985; Turchin,1991),动物传播(Kitching,1971; Byers,2000),植物传播(Okubo和Levin,1989),细胞迁移(Nossal和Weiss,1974) ),微生物运输(Li等人,1996),甚至聚合物链动力学(Tchen,1952; Bracher,2004)。有关更广泛的评论,请参见Berg(1983),Weiss(1994)或Codling等。 (2008)。

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