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 $C_1,..., C_s$ are nested linear codes and $A$ 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

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 índice 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. Metodología: 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 tadísticamente 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

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

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 $2-$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 ectomicorrícicos

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 micología molecular, cuyas aplicaciones a nivel de detección, identificación y clasificación de hongos se incrementan día a día. En este primer artículo de una serie dedicada a las técnicas moleculares aplicables en Micología, 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)