4,858 research outputs found
Uso de hipoclorito de sódio para acelerar a emergência das plântulas e desenvolvimento das mudas de cafeeiro.
Lorentz-violating extension of scalar QED at finite temperature
In this work, we calculate the one-loop self-energy corrections to the gauge
field in scalar electrodynamics modified by Lorentz-violating terms within the
framework of the standard model extension (SME). We focus on both -even
and -odd contributions. The kinetic part of the scalar sector contains a
-even symmetric Lorentz-breaking tensor, and the interaction terms include
a vector contracted with the usual covariant derivative in a gauge-invariant
manner. We computed the one-loop radiative corrections using dimensional
regularization for both the -even and -odd cases. Additionally, we
employed the Matsubara formalism to account for finite temperature effects.Comment: 7 pages, 2 figures, matches published version in PL
Multi-framework implementation of the problem management process
Many different information technology frameworks have been proposed to assist organizations implementing information technology. However, these frameworks are complex, difficult to implement and overlap each other turning their simultaneous implementation even more difficult to accomplish by organizations. This study proposes to develop an overlapless maturity model that not only help organizations dealing with the problems aforementioned. The model was applied and evaluated by experts in five organizations. The artefact was recognized as useful, complete and helpful in a multi-framework implementation by PM experts. This research provides contributions for academics since it distinguishes itself from the existing artefacts in the body of knowledge and is a baseline for further investigation.info:eu-repo/semantics/publishedVersio
Robust exponential decay of correlations for singular-flows
We construct open sets of Ck (k bigger or equal to 2) vector fields with
singularities that have robust exponential decay of correlations with respect
to the unique physical measure. In particular we prove that the geometric
Lorenz attractor has exponential decay of correlations with respect to the
unique physical measure.Comment: Final version accepted for publication with added corrections (not in
official published version) after O. Butterley pointed out to the authors
that the last estimate in the argument in Subsection 4.2.3 of the previous
version is not enough to guarantee the uniform non-integrability condition
claimed. We have modified the argument and present it here in the same
Subsection. 3 figures, 34 page
Screening effects in flow through rough channels
A surprising similarity is found between the distribution of hydrodynamic
stress on the wall of an irregular channel and the distribution of flux from a
purely Laplacian field on the same geometry. This finding is a direct outcome
from numerical simulations of the Navier-Stokes equations for flow at low
Reynolds numbers in two-dimensional channels with rough walls presenting either
deterministic or random self-similar geometries. For high Reynolds numbers,
when inertial effects become relevant, the distribution of wall stresses on
deterministic and random fractal rough channels becomes substantially dependent
on the microscopic details of the walls geometry. In addition, we find that,
while the permeability of the random channel follows the usual decrease with
Reynolds, our results indicate an unexpected permeability increase for the
deterministic case, i.e., ``the rougher the better''. We show that this complex
behavior is closely related with the presence and relative intensity of
recirculation zones in the reentrant regions of the rough channel.Comment: 4 pages, 5 figure
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