sandpile


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sandpile

A filling of compacted sand which has been rammed into a hole left by a pile that has been driven into the ground and then withdrawn.
References in periodicals archive ?
To put it yet a different way, the sandpile forms, experiences avalanches, and so forth as a consequence of a single causal process.
One of his sandpiles, for example, is bounded by an unusual stretch of solid wood, because somebody worried he might roll a foreleg under the standard fencing and break a bone as he tried to stand up.
Dhar, Self-organized critical state of the sandpile automaton models.
The concrete example of this is the sandpile, where sand being piled up organizes itself into a little cone which contains within its structure inherent instability which might trigger a large avalanche upon the addition of a single grain of sand at some point--or might not.
Feigenbaum Parameter g Fixed point and dynamics double period Cellular Stephen Wolfram Evolved Class I and II automata behaviour Cellular Chris Langton Lambda Order automata parameter [lambda] < 1/3 Boolean nets Stuart Kauffman, Variable K Order K = 1 Sandpile Per Bak Shape of Flat and stable experiment sandpile Number theory Alan Turing Set of number Computability Organization R.
The Shifting Sands of Power Delivery, from our Natural Science section, describes an attempt to model the complex processes of power transmission by an unlikely correlation: the physics of sandpile avalanches.
The sandpile theory--self-organized criticality--is irresistible as a metaphor," enthuses Soft Green presidential candidate Al Gore.
It appears that as a sandpile grows in height, it eventually reaches a state-criticality-at which the amount of sand accumulating on top is balanced by the avalanches that carry it away.
The parallel chip-firing game, also known as the discrete fixed-energy sandpile model, is an automaton on graphs in which vertices that have at least as many chips as incident edges "fire" chips to their neighbors.
We make a sandpile by dropping sand from one particular spot onto a horizontal surface.
A sandpile serves as a simple model for complexity in nature and as a theoretical justification for catastrophism.
On Old Main, a former motel turned nursing home is seeing a new incarnation as retirement apartments; just west of downtown's library, a new 12-unit, two-story townhouse complex overlooks the river; and then, of course, there's the Sandpile.