Supersymmetric spin chains with nonmonotonic dispersion relation: criticality and entanglement entropy

We study the critical behavior and the ground-state entanglement of a large class of su(1|1) supersymmetric spin chains with a general (not necessarily monotonic) dispersion relation. We show that this class includes several relevant models, with both short-and long-range interactions of a simple form. We determine the low temperature behavior of the free energy per spin, and deduce that the models considered have a critical phase in the same universality class as a (1 + 1)-dimensional conformal field theory (CFT) with central charge equal to the number of connected components of the Fermi sea. We also study the Renyi entanglement entropy of the ground state, deriving its asymptotic behavior as the block size tends to infinity. In particular, we show that this entropy exhibits the logarithmic growth characteristic of (1 + 1)-dimensional CFTs and one-dimensional (fermionic) critical lattice models, with a central charge consistent with the low-temperature behavior of the free energy. Our results confirm the widely believed conjecture that the critical behavior of fermionic lattice models is completely determined by the topology of their Fermi surface

Four-body continuum-discretized coupled-channels calculations: Application to 6He+64Zn at 13.6 MeV

The recently developed four-body continuum-discretized coupled-channels (CDCC) method, making use of the binning procedure [1], is applied to the reaction 6He+64Zn at 13.6 MeV (around the Coulomb barrier). Excellent agreement with available elastic data [2] is found.Dirección General de Investigación Científica y Técnica FIS 2008-04189, FPA 2006- 13807-C02-01U.S. Department of Energy DE-AC52-07NA27344U.K. STFC EP/D00362

A combinatorial method for the evaluation of yield of fault-tolerant systems-on-chip

In this paper we develop a combinatorial method for the evaluation of yield of fault-tolerant systems-on-chip. The method assumes that defects are produced according to a model in which defects are lethal and affect given components of the system following a distribution common to all defects. The distribution of the number of defects is arbitrary. The method is based on the formulation of the yield as 1 minus the probability that a given boolean function with multiple-valued variables has value 1. That probability is computed by analyzing a ROMDD (reduced ordered multiple-valuedecision diagram) representation of the function. For efficiency reasons, we first build a coded ROBDD (reduced ordered binary decision diagram) representation of the function and then transform that coded ROBDD into the ROMDD required by the method. We present numerical experiments showing that the method is able to cope with quite large systems in moderate CPU times.Postprint (published version

On the monitoring of surface displacement in connection with volcano reactivation in Tenerife, Canary Islands, using space techniques

Geodetic volcano monitoring in Tenerife has mainly focused on the Las Cañadas Caldera, where a geodetic micronetwork and a levelling profile are located. A sensitivity test of this geodetic network showed that it should be extended to cover the whole island for volcano monitoring purposes. Furthermore, InSAR allowed detecting two unexpected movements that were beyond the scope of the traditional geodetic network. These two facts prompted us to design and observe a GPS network covering the whole of Tenerife that was monitored in August 2000. The results obtained were accurate to one centimetre, and confirm one of the deformations, although they were not definitive enough to confirm the second one. Furthermore, new cases of possible subsidence have been detected in areas where InSAR could not be used to measure deformation due to low coherence. A first modelling attempt has been made using a very simple model and its results seem to indicate that the deformation observed and the groundwater level variation in the island may be related. Future observations will be necessary for further validation and to study the time evolution of the displacements, carry out interpretation work using different types of data (gravity, gases, etc) and develop models that represent the island more closely. The results obtained are important because they might affect the geodetic volcano monitoring on the island, which will only be really useful if it is capable of distinguishing between displacements that might be linked to volcanic activity and those produced by other causes. One important result in this work is that a new geodetic monitoring system based on two complementary techniques, InSAR and GPS, has been set up on Tenerife island. This the first time that the whole surface of any of the volcanic Canary Islands has been covered with a single network for this purpose. This research has displayed the need for further similar studies in the Canary Islands, at least on the islands which pose a greater risk of volcanic reactivation, such as Lanzarote and La Palma, where InSAR techniques have been used already

Enfermedad inflamatoria crónica intestinal con hipoproteinemia y ascitis en el perro: 14 casos clínicos

The main causes of protein losing enteropathy in dogs are intestinal lymphangiectasia, inflammatory bowel disease (IBD) and intestinal lymphoma. The aim of this research is to clinically characterize inflammatory bowel disease causing hypoproteinemia and ascitis in the dog. For this purpose clinical histories of 14 dogs were revised retrospectively. The results of the current study show that this disease is most common in adult dogs with mean ages around 5 years, and more frequently diagnosed in Yorkshire Terrier and Rottweiler breeds. Clinical signs included mainly chronic diarrhea with small intestine characteristics (100%), weight loss (64%), vomiting (39%) and decreased appetite (21%). All 14 cases presented total serum protein under 3,5g/dl (mean value 2,83±0,44 g/dl), albumin under 1,7 g/dl (mean value 1,45±0,17 g/dl), and albumin/globulin fraction around 1.Las causas principales de enteropatía con pérdida de proteínas en perros son la linfangiectasia intestinal, la enfermedad inflamatoria crónica intestinal (EII) y el linfosarcoma intestinal. El objetivo fundamental de este trabajo es la caracterización clínica de la enfermedad inflamatoria crónica intestinal con hipoproteinemia y ascitis en el perro. Para ello se ha realizado un estudio retrospectivo en el que se han revisado las historias clínicas de 14 perros. Los resultados de nuestro estudio demuestran que esta enfermedad es característica de perros adultos con edades medias en torno a los 5 años, y aparece con mayor frecuencia en las razas Yorkshire Terrier y Rottweiler. Los signos clínicos más frecuentes fueron: diarrea crónica de intestino delgado (100%), pérdida de peso (64%), vómitos (29%) y disminución del apetito (21%). Todos los pacientes del estudio presentaron unas proteínas séricas por debajo de 3,5 g/dl (valor medio de 2,83±0,44 g/dl), con una albúmina inferior a 1,7 g/dl (valor medio de 1,45±0,17 g/dl), con cociente albúmina/globulina en torno a 1

Localización de las neoplasias epiteliales de intestino grueso en el perro: estudio retrospectivo de 24 casos clínicos

El propósito del presente artículo es la realización de un estudio sobre la localización de las neoplasias epiteliales que afectan al intestino grueso del perro. Para ello se ha realizado un estudio retrospectivo en 24 perros diagnosticados de neoplasia epitelial de intestino grueso. Los resultados señalan que la localización más frecuente de las neoplasias epiteliales de intestino grueso del perro es la zona rectal (75% de los casos estudiados). Todos los adenomas se localizaron en recto, no presentándose ninguno en zonas más craneales. En cambio, los carcinomas se distribuyeron casi por igual en recto y en colon descendente.The aim of this paper was to study the localization of epithelial neoplasia affecting the large intestine in dogs. A retrospective study was performed on 24 dogs that had large intestine epithelial neoplasia. The rectal segment of the large intestine was the place where the epithelial neoplasia were more commonly found. According to the results of the current study, 75% of the cases were affecting the rectum. All adenomas were located in the rectum, while none of them were in more cranial segments of the large bowel. In contrast, carcinomas were equally distributed between the rectum and the descendent colon