3,198 research outputs found
Experiência a campo com inseminação artificial de suínos.
bitstream/item/59338/1/CUsersPiazzonDocuments16.pd
Inequivalent -graded brackets, -bit parastatistics and statistical transmutations of supersymmetric quantum mechanics
Given an associative ring of -graded operators, the number of
inequivalent brackets of Lie-type which are compatible with the grading and
satisfy graded Jacobi identities is . This follows
from the Rittenberg-Wyler and Scheunert analysis of "color" Lie (super)algebras
which is revisited here in terms of Boolean logic gates. The inequivalent
brackets, recovered from mappings, are
defined by consistent sets of commutators/anticommutators describing particles
accommodated into an -bit parastatistics (ordinary bosons/fermions
correspond to bit). Depending on the given graded Lie (super)algebra, its
graded sectors can fall into different classes of equivalence expressing
different types of (para)bosons and/or (para)fermions. As a first application
we construct and -graded quantum Hamiltonians which
respectively admit and inequivalent multiparticle quantizations
(the inequivalent parastatistics are discriminated by measuring the eigenvalues
of certain observables in some given states). As a main physical application we
prove that the -extended, supersymmetric and superconformal quantum
mechanics, for , are respectively described by
alternative formulations based on the inequivalent graded Lie (super)algebras.
These numbers correspond to all possible "statistical transmutations" of a
given set of supercharges which, for , are accommodated into a
-grading with (the identification is ). In the
simplest setting (the -particle sector of the de DFF deformed
oscillator with spectrum-generating superalgebra), the -graded
parastatistics imply a degeneration of the energy levels which cannot be
reproduced by ordinary bosons/fermions statistics.Comment: 57 pages, 16 figure
Realization of Rectangular Artificial Spin Ice and Direct Observation of High Energy Topology
In this letter, we have constructed and experimentally investigated
frustrated arrays of dipoles forming two-dimensional artificial spin ices with
different lattice parameters (rectangular arrays with horizontal and vertical
lattice spacings denoted by and respectively). Arrays with three
different ratios , and are
studied. Theoretical calculations of low-energy demagnetized configurations for
these same parameters are also presented. Experimental data for demagnetized
samples confirm most of the theoretical results. However, the highest energy
topology (doubly-charged monopoles) does not emerge in our theoretical model,
while they are seen in experiments for large enough . Our results also
insinuate that magnetic monopoles may be almost free in rectangular lattices
with a critical ratio , supporting previous
theoretical predictions
Eficiência a campo do sêmen suíno congelado.
bitstream/item/59160/1/CUsersPiazzonDocuments46.pd
Efeito do pedilúvio com formol associado ao desgastamento do piso, sobre o quadro clínico das claudicações em suínos.
Aparelho locomotor localizados nos casco dos suínos. Lesões na sola e na parede do casco. Efeito do tratamento do casco com formal. Diminuição abrasiva do piso
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