36,480 research outputs found
A Flexible Implementation of a Matrix Laurent Series-Based 16-Point Fast Fourier and Hartley Transforms
This paper describes a flexible architecture for implementing a new fast
computation of the discrete Fourier and Hartley transforms, which is based on a
matrix Laurent series. The device calculates the transforms based on a single
bit selection operator. The hardware structure and synthesis are presented,
which handled a 16-point fast transform in 65 nsec, with a Xilinx SPARTAN 3E
device.Comment: 4 pages, 4 figures. IEEE VI Southern Programmable Logic Conference
201
Aproximative solutions to the neutrino oscillation problem in matter
We present approximative solutions to the neutrino evolution equation
calculated by different methods. In a two neutrino framework, using the
physical parameters which gives the main effects to neutrino oscillations from
nu{e} to another flavors for L=3000Km and E=1GeV, the results for the
transition probability calculated by using series solutions, by to take the
neutrino evolution operator as a product of ordered partial operators and by
numerical methods, for a linearly and sinusoidally varying matter density are
compared. The extension to an arbitrary density profile is discussed and the
evolution operator as a product of partial operators in the three neutrino case
is obtained.Comment: 12 pages, 5 figure
Aging and fluctuation-dissipation ratio in a nonequilibrium -state lattice model
A generalized version of the nonequilibrium linear Glauber model with
states in dimensions is introduced and analyzed. The model is fully
symmetric, its dynamics being invariant under all permutations of the
states. Exact expressions for the two-time autocorrelation and response
functions on a -dimensional lattice are obtained. In the stationary regime,
the fluctuation-dissipation theorem holds, while in the transient the aging is
observed with the fluctuation-dissipation ratio leading to the value predicted
for the linear Glauber model
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