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Additional resources for Resonant Acoustic and Electric Oscillations Released by the Relatively Slow Spring Break
Imagine we lay out a sheet of bubble wrap on the ﬂoor. We’ll imagine that each of the bubbles in the bubble wrap is an atom or molecule and that this represents the outer surface of some crystalline structure. © 2007 by Taylor & Francis Group, LLC 32 Self Assembly Try It Yourself - The Bubble Raft A bubble raft is fairly easy to create and is well-worth the minimal time and eﬀort needed. To carry out this experiment yourself you will need: Materials • Beaker, Petri-dish, or other large-mouthed container.
Once it does, this walker is ﬁxed in place and becomes part of the growing cluster. Additional walkers are then added, the process repeated and the cluster allowed to grow. 15. 6. Even more remarkably, DLA simulations have been used to model electrodeposition, viscous ﬁngering in the Hele-Shaw instability, and even the growth of bacterial colonies. Numerous researchers have modiﬁed the DLA model, introducing variations such as nonsquare grids, particles sticking with a probability, curvature dependent local particle behavior, and global constraints.
There work with the tobacco mosaic virus allowed us to begin to understand how nature uses self-assembly in biology. Another early key development in self-assembly, that occurred shortly after Feynman’s lecture, was the invention of “Wang Tiles” by Hao Wang. Wang showed the equivalence of tiling problems and computation, thereby extending Turing’s work and providing the second key ingredient for Winfree’s demonstration of computation by self-assembly. On the macroscale, other researchers have made fundamental contributions to our understanding and practical implementation of self-assembly.