منابع مشابه
Dynamics of explosive degassing of magma Observations of fragmenting twophase flows
Liquid explosions, generated by rapid egassing of strongly supersaturated liquids, have been investigated in the laboratory with a view to understanding the basic physical laX•sses operating during bubble nucleation a d growth and the subsequent behavior fthe expanding two-phase flow. Experimenkq are carried out in a shock tube and ,me monitored by high-speed photography and pressure trm•sducer...
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T he mechanism of human consciousness persists as a fundamental question in science and philosophy. As English biologist T. H. Huxley noted, “how it is that anything so remarkable as a state of consciousness comes about as the result of irritating nervous tissue, is just as unaccountable as the appearance of the Djin when Aladdin rubbed his lamp.” Although the neurobiological basis of phenomena...
متن کاملFrom Fragmenting Munitions
A fundamental step in evaluation of warhead perfonnance is the characterization of fragments emitted during warhead detonation. The emitted fragments must be captured, a process made difficult by their high initial speeds; however, the capture must be "soft" to avoid breaking the fragments into pieces, thus changing the mass distribution. Customary techniques involve the capture in sheets of so...
متن کاملFragmenting Random Permutations
Problem 1.5.7 from Pitman’s Saint-Flour lecture notes [11]: Does there exist for each n a fragmentation process (Πn,k, 1 ≤ k ≤ n) such that Πn,k is distributed like the partition generated by cycles of a uniform random permutation of {1, 2, . . . , n} conditioned to have k cycles? We show that the answer is yes. We also give a partial extension to general exchangeable Gibbs partitions.
متن کاملFree and Fragmenting Filling Length
A. The filling length of an edge-circuit η in the Cayley 2-complex of a finitely presented group is the least integer L such that there is a combinatorial null-homotopy of η down to a basepoint through loops of length at most L. We introduce similar notions in which the null-homotopy is not required to fix a basepoint, and in which the contracting loop is allowed to bifurcate. We exhibit...
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ژورنال
عنوان ژورنال: Nature
سال: 1999
ISSN: 0028-0836,1476-4687
DOI: 10.1038/17029