2,568 research outputs found
List Decoding of Matrix-Product Codes from nested codes: an application to Quasi-Cyclic codes
A list decoding algorithm for matrix-product codes is provided when are nested linear codes and is a non-singular by columns matrix. We
estimate the probability of getting more than one codeword as output when the
constituent codes are Reed-Solomon codes. We extend this list decoding
algorithm for matrix-product codes with polynomial units, which are
quasi-cyclic codes. Furthermore, it allows us to consider unique decoding for
matrix-product codes with polynomial units
Semiclassical Concepts in Magnetoelectronics
Semiclassical theories of electron and spin transport in metallic magnetic
structures are reviewed with emphasis on the role of disorder and electronic
band structures in the current perpendicular to the interface plane (CPP)
transport configuration.Comment: Proceedings of the NEC Symposium on "Spin-related Quantum Transport
in Mesoscopic Systems", to be published in the Journal of Materials Science
and Engineering
Variational Principle underlying Scale Invariant Social Systems
MaxEnt's variational principle, in conjunction with Shannon's logarithmic
information measure, yields only exponential functional forms in
straightforward fashion. In this communication we show how to overcome this
limitation via the incorporation, into the variational process, of suitable
dynamical information. As a consequence, we are able to formulate a somewhat
generalized Shannonian Maximum Entropy approach which provides a unifying
"thermodynamic-like" explanation for the scale-invariant phenomena observed in
social contexts, as city-population distributions. We confirm the MaxEnt
predictions by means of numerical experiments with random walkers, and compare
them with some empirical data
Evolution of the body mass, height and BMI in participants of the Ultra-trail CSP- 115
Introducción:
este
estudio analiza, en 32 participantes
que finalizaron
el Ultratrail
-
CSP
-
115, los cambios
antropométricos sufridos en
cuanto a masa corporal,
altura e Ãndice de masa corporal (IMC). Los
objetivos
del estudio son:
analizar las diferencias entre salida y
meta de mas
a corporal, altura e IMC;
y
describir la
evolución del peso durante el evento.
MetodologÃa:
la masa corporal
, altura
e IMC
fueron
comparadas utilizando una prueba t de Student. Para
describir la evolución de la masa corporal
durante
la
carrera se utilizó un análisis de varianza (ANOVA)
de medidas repetidas.
Resultados:
l
os resultados obtenidos indican cambios
es
tadÃsticamente significativos para el análisis de
ambos objetivos.
Discusión y conclusiones
:
los resultados obtenidos
son coherentes con otros estudios
similares, aunque
existen concreciones y matices interesantes. Destaca
la
pérdida de masa corporal de
los c
orredores, lo cual
hace recomendable realizar
medidas durante la
carrera para evitar consecuencias negativas
en la
salud
.Introduction:
this study analyses anthropometric
changes in terms
of body mass, height and body mass
index (BMI), in 32 finishers of the Ultratrail
-
CSP
-
115
. The aims of the study are:
to analyse the
differences of body mass, height and BMI between
the start and the
finish of the race; and
to describe the
evolution of the
weight during the event.
Methodology:
the body mass, height and BMI were
compared using a T
-
S
tudent test.
To describe the
evolution of body mass during the race an analysis of
variance (ANOVA) for repeated measures was used.
Results:
s
ignificant changes
w
ere observed in the
analysis of
both objectives.
Discussion and conclusions:
the results are consistent
with other similar studies, although there are
concretions and interesting nuances. It stresses the
loss of body mass of runners, which makes it
advisa
ble to make measurements during the race to
avoid negative health consequences.Este estudio se ha podido llevar a cabo gracias a la
colaboración de Hospitales NISA, la Asociación de
D
iabetes de Castellón (ADI
-
CAS), Oximesa S.L.y
Villarreal Club de Fútbol, S. A. D
Proximity effect gaps in S/N/FI structures
We study the proximity effect in hybrid structures consisting of
superconductor and ferromagnetic insulator separated by a normal diffusive
metal (S/N/FI structures). These stuctures were proposed to realize the
absolute spin-valve effect. We pay special attention to the gaps in the density
of states of the normal part. We show that the effect of the ferromagnet is
twofold: It not only shifts the density of states but also provides suppression
of the gap. The mechanism of this suppression is remarkably similar to that due
to magnetic impurities. Our results are obtained from the solution of
one-dimensional Usadel equation supplemented with boundary conditions for
matrix current at both interfaces.Comment: Published in The European Physical Journal
Geometric description of BTZ black holes thermodynamics
We study the properties of the space of thermodynamic equilibrium states of
the Ba\~nados-Teitelboim-Zanelli (BTZ) black hole in (2+1)-gravity. We use the
formalism of geometrothermodynamics to introduce in the space of equilibrium
states a dimensional thermodynamic metric whose curvature is non-vanishing,
indicating the presence of thermodynamic interaction, and free of
singularities, indicating the absence of phase transitions. Similar results are
obtained for generalizations of the BTZ black hole which include a Chern-Simons
term and a dilatonic field. Small logarithmic corrections of the entropy turn
out to be represented by small corrections of the thermodynamic curvature,
reinforcing the idea that thermodynamic curvature is a measure of thermodynamic
interaction
Extended x-ray-absorption fine-structure studies of heat-treated fcc-Fe_50Cu_50 powders processed via high-energy ball milling
The local structure and chemistry of a ferromagnetic fcc-Fe_50Cu_50 solid solution obtained through high-energy ball milling were measured before and after heat-treatment-induced decomposition using extended x-ray-absorption fine-structure measurements. The decomposition is first evident with the phase separation of a-Fe after a heat treatment at 523 K. Analysis of the residual fee component revealed that the Fe atoms were predominantly surrounded by other Fe atoms, suggesting that the Fe has coalesced within the fee structure. The Fe atoms within the fee phase likely exist in low-spin clusters which provide an explanation for the reduced values of low-temperature magnetization previously measured in annealed samples [P. Crespo et aZ., Phys. Rev. B 48, 7134 (1993)]
PCR: una nueva herramienta para el estudio de hongos ectomicorrÃcicos
PCR: a new tool for the study of ectomycorrhizal fungi. PCR (Polymerase
Chain Reaction) is a simple technique that allows the specific amplification of particular regions
of the genome of living organisms to facilitate their study. In the last few years, this and other
complementary techniques have opened the field of the molecular mycology, whose Applications in detection, identification and c1assification of fungi are increasing every day. In this article, the
first of a series dealing with the Molecular Techniques that can be used in Mycology, we explain
the basic principies of both the PCR and two other complementary techniques commonly used
for the molecular analysis of the amplified regions: RFLPs (Restriction Fragment Length
Polymorphisms) and sequencing (determination ofthe primary structure ofthe nucleic acids).La PCR (reacción en cadena de la polimerasa) es una técnica sencilla que permite
sacar copias (amplificar) de una determinada región del genoma de los seres vivos con el fin de facilitar su estudio. Esta y otras técnicas complementarias se han abierto, en los últimos años, al
ámbito de la micologÃa molecular, cuyas aplicaciones a nivel de detección, identificación y
clasificación de hongos se incrementan dÃa a dÃa. En este primer artÃculo de una serie dedicada a las técnicas moleculares aplicables en MicologÃa, se exponen los principios básicos, tanto de la
PCR como de las otras dos técnicas complementarias que se utilizan habitualmente para el análisis molecular de las regiones amplificadas: los RFLPs (polimorfismos del tamaño de los
fragmentos de restricción) y la secuenciación (determinación de la estructura primaria de los ácidos nucleicos)
- …