منابع مشابه
How do quasicrystals grow?
Using molecular simulations, we show that the aperiodic growth of quasicrystals is controlled by the ability of the growing quasicrystal nucleus to incorporate kinetically trapped atoms into the solid phase with minimal rearrangement. In the system under investigation, which forms a dodecagonal quasicrystal, we show that this process occurs through the assimilation of stable icosahedral cluster...
متن کاملHow straight do axons grow?
Detailed growth paths of embryonic frog and chick axons were measured as the axons elongated in dispersed cultures on acid-rinsed glass surfaces. Mathematical analyses demonstrate that, under these conditions, axons do not grow randomly but tend to grow straight. Growth cones appear to actively alternate sides--right and left from the straight line of growth--and the growth cone neck exhibits a...
متن کاملHow do random Fibonacci sequences grow?
We study the random Fibonacci sequences defined by F1 = F2 = F̃1 = F̃2 = 1 and for n ≥ 1, Fn+2 = Fn+1 ± Fn (linear case) and F̃n+2 = |F̃n+1 ± F̃n| (non-linear case), where each ± sign is independent and either + with probability p or − with probability 1 − p (0 < p ≤ 1). Our main result is that the exponential growth of Fn for 0 < p ≤ 1, and of F̃n for 1/3 ≤ p ≤ 1 is almost surely given by ∫ ∞ 0 log ...
متن کاملHow Do Online Social Networks Grow?
Online social networks such as Facebook, Twitter and Gowalla allow people to communicate and interact across borders. In past years online social networks have become increasingly important for studying the behavior of individuals, group formation, and the emergence of online societies. Here we focus on the characterization of the average growth of online social networks and try to understand w...
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it is necessary for community health nurses to be aware of children growth velocity as well as their height. this is a report of joan arton’s study on primary schools children. traditionally children health indicators were based on if they gain enough weight or not. although today it is proved that height is a better index for children health, but measuring height alone is not enough and growth...
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ژورنال
عنوان ژورنال: Earth and Planetary Science Letters
سال: 2020
ISSN: 0012-821X
DOI: 10.1016/j.epsl.2020.116320