51 research outputs found
Certaine, Donald
Co. C, 1311 Engr (GS) Regimenthttps://dh.howard.edu/prom_members/1014/thumbnail.jp
Minimum weight shield synthesis for space vehicles
Minimum weight proton shield synthesis for space vehicle
Ordered groupoids and the holomorph of an inverse semigroup
We present a construction for the holomorph of an inverse semigroup, derived
from the cartesian closed structure of the category of ordered groupoids. We
compare the holomorph with the monoid of mappings that preserve the ternary
heap operation on an inverse semigroup: for groups these two constructions
coincide. We present detailed calculations for semilattices of groups and for
the polycyclic monoids.Comment: 16 page
Links between dissipation, intermittency, and helicity in the GOY model revisited
High-resolution simulations within the GOY shell model are used to study
various scaling relations for turbulence. A power-law relation between the
second-order intermittency correction and the crossover from the inertial to
the dissipation range is confirmed. Evidence is found for the intermediate
viscous dissipation range proposed by Frisch and Vergassola. It is emphasized
that insufficient dissipation-range resolution systematically drives the energy
spectrum towards statistical-mechanical equipartition. In fully resolved
simulations the inertial-range scaling exponents depend on both model
parameters; in particular, there is no evidence that the conservation of a
helicity-like quantity leads to universal exponents.Comment: 24 pages, 13 figures; submitted to Physica
Numerical study of the small dispersion limit of the Korteweg-de Vries equation and asymptotic solutions
We study numerically the small dispersion limit for the Korteweg-de Vries
(KdV) equation for and give a
quantitative comparison of the numerical solution with various asymptotic
formulae for small in the whole -plane. The matching of the
asymptotic solutions is studied numerically
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