13,021 research outputs found
Phenomenological Renormalization Group Methods
Some renormalization group approaches have been proposed during the last few
years which are close in spirit to the Nightingale phenomenological procedure.
In essence, by exploiting the finite size scaling hypothesis, the approximate
critical behavior of the model on infinite lattice is obtained through the
exact computation of some thermal quantities of the model on finite clusters.
In this work some of these methods are reviewed, namely the mean field
renormalization group, the effective field renormalization group and the finite
size scaling renormalization group procedures. Although special emphasis is
given to the mean field renormalization group (since it has been, up to now,
much more applied an extended to study a wide variety of different systems) a
discussion of their potentialities and interrelations to other methods is also
addressed.Comment: Review Articl
PFAPA - A Case Report
O sÃndrome PFAPA ( Periodic Fever, Aphtous stomatitis,Pharingitis and Adenitis) foi descrito pela primeira vez em 1987. A
etiologia é desconhecida. Clinicamente caracteriza-se por febre alta, recorrente, com intervalos de quatro a seis semanas. A febre tem a duração de cerca de cinco dias e regride espontaneamente.
Associadas à febre, encontram-se estomatite aftosa, faringite e adenomegalias cervicais. Os sintomas iniciam-se antes dos cinco anos
de idade e tornam-se menos frequentes à medida que a criança cresce. O doente está assintomático entre os episódios febris, não há repercussão no desenvolvimento estaturo-ponderal ou psicomotor e não estão descritas sequelas. Leucocitose, velocidade de sedimentação (VS) e proteÃna C reactiva (PCR) elevadas durante as crises são as únicas alterações laboratoriais encontradas.
Os autores descrevem o caso clÃnico de uma criança de vinte meses, com febre periódica iniciada aos seis meses, periodicidade de vinte e oito dias e duração de cinco dias, estando assintomático entre as crises. Excluiu-se patologia infecciosa, neoplásica e imunológica, assim como outros sÃndromes febris periódicos com inÃcio na infância.
No primeiro dia de cada episódio febril, iniciou terapêutica com dose única de prednisolona oral (2mg/Kg), com alargamento do intervalo entre os episódios febris, diminuição da duração e gravidade das crises subsequentes
Going Further with Point Pair Features
Point Pair Features is a widely used method to detect 3D objects in point
clouds, however they are prone to fail in presence of sensor noise and
background clutter. We introduce novel sampling and voting schemes that
significantly reduces the influence of clutter and sensor noise. Our
experiments show that with our improvements, PPFs become competitive against
state-of-the-art methods as it outperforms them on several objects from
challenging benchmarks, at a low computational cost.Comment: Corrected post-print of manuscript accepted to the European
Conference on Computer Vision (ECCV) 2016;
https://link.springer.com/chapter/10.1007/978-3-319-46487-9_5
Transformations of Heun's equation and its integral relations
We find transformations of variables which preserve the form of the equation
for the kernels of integral relations among solutions of the Heun equation.
These transformations lead to new kernels for the Heun equation, given by
single hypergeometric functions (Lambe-Ward-type kernels) and by products of
two hypergeometric functions (Erd\'elyi-type). Such kernels, by a limiting
process, also afford new kernels for the confluent Heun equation.Comment: This version was published in J. Phys. A: Math. Theor. 44 (2011)
07520
Basin structure in the two-dimensional dissipative circle map
Fractal basin structure in the two-dimensional dissipative circle map is
examined in detail. Numerically obtained basin appears to be riddling in the
parameter region where two periodic orbits co-exist near a boundary crisis, but
it is shown to consist of layers of thin bands.Comment: published in J. Phys. Soc. Jpn., 72, 1943-1947 (2003
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