234 research outputs found
Nonequilibrium statistical operator method in the Renyi statistics
The generalization of the Zubarev nonequilibrium statistical operator method
for the case of Renyi statistics is proposed when the relevant statistical
operator (or distribution function) is obtained based on the principle of
maximum for the Renyi entropy. The nonequilibrium statistical operator and
corresponding generalized transport equations for the reduced-description
parameters are obtained. A consistent description of kinetic and hydrodynamic
processes in the system of interacting particles is considered as an example.Comment: 13 pages, RevTeX4-forma
Cork stoppers industry: defining appropriate mould colonization
Aims: The main aims of this work were the study of cork
slabs moulds colonization and the evaluation of the moulds
diversity during cork processing steps, in different cork stoppers
factories. Simultaneously, it was envisaged to perform an
evaluation of the air quality.
Methods and Results: Moulds were isolated and identified
from cork slabs and cork samples in four cork stoppers factories.
The identification was based on morphological characters
and microscopic observation of the reproductive structures.
Airborne spore dispersion was assessed using a two stage
Andersen sampler. It was observed that Chrysonilia sitophila
was always present on cork slabs during the maturing period,
but mould diversity appeared to be associated to the different
factory configurations and processing steps.
Conclusions: Spatial separation of the different steps of the
process, including physical separation of the maturation step,
is essential to guarantee high air quality and appropriate cork
slabs colonization, i.e. C. sitophila dominance. The sorting
and cutting of the edges of cork slabs after boiling and before
the maturing step is also recommended.
Significance and Impact of the Study: This study is very
important for the cork stopper industry as it gives clear indications
on how to keep high quality manufacturing standards and
how to avoid occupational health problems.Instituto de Biologia Experimental e Tecnológica/Instituto de Tecnologia Química e Biológica-Universidade Nova de Lisboa,
Apt. 12, 2781-901 OEIRAS. Portugal
2 Estação Agronómica Nacional, 2784-505 OEIRAS. Portugal
3 Estação Vitivinícola Nacional, 2565-191 DOIS PORTOS. Portugal. Program PEDIP II,
M 4.8, IAPMEI, Ministério da Economia, Portugal
Incremental proximal methods for large scale convex optimization
Laboratory for Information and Decision Systems Report LIDS-P-2847We consider the minimization of a sum∑m [over]i=1 fi (x) consisting of a large
number of convex component functions fi . For this problem, incremental methods
consisting of gradient or subgradient iterations applied to single components have
proved very effective. We propose new incremental methods, consisting of proximal
iterations applied to single components, as well as combinations of gradient, subgradient,
and proximal iterations. We provide a convergence and rate of convergence
analysis of a variety of such methods, including some that involve randomization in
the selection of components.We also discuss applications in a few contexts, including
signal processing and inference/machine learning.United States. Air Force Office of Scientific Research (grant FA9550-10-1-0412
On the influence of a Coulomb-like potential induced by the Lorentz symmetry breaking effects on the Harmonic Oscillator
In this work, we obtain bound states for a nonrelativistic spin-half neutral
particle under the influence of a Coulomb-like potential induced by the Lorentz
symmetry breaking effects. We present a new possible scenario of studying the
Lorentz symmetry breaking effects on a nonrelativistic quantum system defined
by a fixed space-like vector field parallel to the radial direction interacting
with a uniform magnetic field along the z-axis. Furthermore, we also discuss
the influence of a Coulomb-like potential induced by Lorentz symmetry violation
effects on the two-dimensional harmonic oscillator.Comment: 14 pages, no figure, this work has been accepted for publication in
The European Physical Journal Plu
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