A proposal of a Renormalization Group transformation

We propose a family of renormalization group transformations characterized by free parameters that may be tuned in order to reduce the truncation effects. As a check we test them in the three dimensional XY model. The Schwinger--Dyson equations are used to study the renormalization group flow.Comment: Contribution to Lattice'94. uuencoded postscript fil

Parálisis del nervio interóseo posterior tras luxación posterolateral de codo

Se presenta un infrecuente caso clínico de parálisis del nervio interóseo posterior en asociación con luxación de codo. La discusión argumenta sobre la patogenia y bases anatómicas que pueden justificar esta asociación.We report an uncommon case of posterior interosseus nerve palsy in association with an elbow dislocation. The authors discuss about the mechanism and anatomical basis of this lesion

Analysis of Inter-seasonal Heat Fluxes in Soils

AbstractAssessment of the practical implementation of systems for subsurface inter-seasonal storage and recovery of solar energy requires a modelling capability which can represent heat transfer processes at the soil surface, at depth in the soil profile, and within the energy collector system itself. This study presents initial findings related to the development of both analytical and numerical tools to represent various components of such inter-seasonal heat storage facilities. In particular two aspects are considered; firstly the use of widely available averaged meteorological data to be employed in an analytical solution of a simplified version of the problem and secondly the use of a more comprehensive finite element solution to explore the detailed thermal response of the ground in terms of seasonal energy storage. Initial comparisons against field measurements from a large scale demonstration project (undertaken by others) are presented and preliminary conclusions related to the key factors affecting the representation of the surface boundary condition made. The analytical approach developed appears to offer a representative and practical way of estimating initial conditions for both initial assessment of potential for energy collection and storage and for use in defining initial conditions in any subsequent numerical analysis of a detailed inter-seasonal heat storage facility

Finite-size scaling study of the d=4 site-diluted Ising

We study the four dimensional site-diluted Ising model using finite-size scaling techniques. We explore the whole parameter space (density-coupling) in order to determine the Universality Class of the transition line. Our data are compatible with Mean Field behavior plus logarithmic corrections.Comment: Contribution to LATTICE 9

Preventive plan hamstring in football kid

El propósito de nuestro estudio es trabajar en un programa de prevención de lesiones en isquiotibiales en jóvenes futbolistas de la etapa infantil (13-14 años), realizando un pretest a todos los sujetos (4 grupos), aplicando un entrenamiento de ADM isquiotibial diferente, y volviendo a hacer un posterior postest transcurridas 10 semanas de entrenamientos, para comprobar qué grupo mejora más trasladando esas mejoras al entrenamiento específico. Para llevar a cabo nuestro estudio hemos requerido 44 jugadores de la categoría infantil. La muestra se clasificó por grupo trabajo por pareja (n1=13), trabajo en parejas + trabajo excéntrico (Hamstrings Nordics) (n2=10), trabajo SGA (n3=7) y trabajo SGA + trabajo excéntrico (Hamstrings Nordics) (n4=14), siendo cada grupo un equipo diferente. Los resultados obtenidos de este estudio son que con cualquier tipo de entrenamiento de ADM vamos a mejorar esta cualidad, sin grandes diferencias entre los diferentes grupos

Naturally-occurring iron minerals as inexpensive catalysts for CWPO

This work explores the potential application of naturally-occurring minerals as inexpensive catalysts in heterogeneous Fenton, namely catalytic wet peroxide oxidation (CWPO). The availability, low cost and environmentally friendly character of those materials make them interesting candidates for such application. The performance of magnetite, hematite and ilmenite as CWPO catalysts has been tested under different working conditions, which include temperature (25–90 °C), H2O2 dose (250–1000 mg L−1) and catalyst concentration (1–4 g L−1). The operating temperature plays a key role on the rate of H2O2 decomposition so that with magnetite H2O2 conversion after 4 h increased from 8 to 99% by increasing the temperature from 25 to 90 °C. Based on the reaction mechanism proposed, a kinetic model was developed which successfully described the experimental results on H2O2 decomposition. The catalytic performance of the minerals tested at temperatures above the ambient was demonstrated using phenol (100 mg L−1) as target pollutant. Unprecedented efficiencies of H2O2 consumption, higher than 80% were achieved, allowing high oxidation and mineralization, i.e. complete phenol conversion and almost 80% TOC reduction at 75 °C with a catalyst loading of 2 g L−1 and the theoretical stoichiometric amount of H2O2 for complete mineralization of phenol (500 mg L−1). Magnetite is particularly attractive, since it showed the highest activity and can be easily separated from the liquid phase given its magnetic properties. All the minerals tested suffered low iron leaching and magnetite and hematite showed a good reusability upon three consecutive runs. However, in this case long-term durability is not a crucial issue, given the availability and low cost of these mineralsThis research has been supported by the Spanish MINECO through the project CTQ2013-4196-R and by the CM through the project S2013/MAE-2716. M. Muñoz thanks the Spanish MINECO for a Juan de la Cierva-Incorporación postdoctoral contract (IJCI-2014-19427

Complicaciones en la cirugía de las luxaciones acromioclaviculares: Estudio comparativo de dos técnicas quirúrgicas

Se realiza un estudio comparativa, retrospectivo, de 46 pacientes con luxación acromioclavicular grado III tratadas quirúrgicamente por la técnica de Phemister (30 caos) y de Bosworth (16 casos). El análisis preoperatorio de ambos grupos no demostró diferencias estadísticamente significativas exceptuando el seguimiento que fue mayor en el grupo de Phemister. En cuanto a resultados, todos los pacientes evolucionaron a la movilidad completa del hombro, con reincorporación a su actividad habitual. No existieron en este apartado diferencias significativas entre ambos grupos. La incidencia de complicaciones fue mayor en el grupo Phemister (75%) que en el Bosworth (13%), debidas fundamentalmente a problemas relacionados con el material de osteosíntesis empleado y con el abordaje quirúrgico. El tornillo utilizado en la técnica de Bosworth asegura buenos resultados funcionales, con menos agresividad quirúrgica y menor riesgo de complicaciones. En ambas técnicas hay que retirar el material en un segundo acto quirúrgico, por lo que debe tenerse en cuenta la posibilidad de emplear implantes de material biorreabsorbible para estudios posteriores.The study compared the clinical and radiographic outcome of two surgical techniques for acute grade III acromioclavicular dislocation: Phemister (30 patients) and Bosworth (16 patients). There are no significative differences between the two groups related to the preoperative assessment. Only the follow-up period was longer in the Phemister group. Concerning results, all patients recovered complete movility and returned to work. There was no significative differences in this evaluation. The Phemister group shows a higher incidence of complications (75%) than the Bosworth group (13%), mainly problems relative to the implant and the surgical approach. The screw employed in the Bosworth technique assure good functional results with lower risk of complications. In both procedures is necessary to remove the hardware in a second operation. The use of bioabsorbable implants should be considered in further studies

Power Quality Monitoring Integration into Distribution Automation through the Use of AMR

Power-quality events are of increasing concern for the economy because today’s equipment, particularly computers and automated manufacturing devices, is highly sensitive to such imperfections. With volatile energy rates and a need to control costs, regional agencies and utilities are interested in technologies to meter distribution use and manage utility information. Metering technologies and communications systems have advanced to enable the development of Automated Meter Reading (AMR) Systems. Power Quality is one area where the AMR system can be very valuable. This paper investigates the challenges in the development of distributed power-quality monitoring system. The approach of this paper is divided into metering, data collection, archiving, analysis, and presentation. It also discusses system architecture, implementation, and provides general guidelines in the tailoring of PQ indexes. This paper describes the challenges and lessons learned from this work.