Mixing Renormalization for Scalar Fields

We consider the renormalization of theories with many scalar fields. We discuss at the one-loop level some simple, non-gauge models with an arbitrary number of scalars and fermions both in mass-shell and MS schemes. In MS scheme we give a detailed qualitative analysis of the RG flow of dimensionless couplings in flavor space.Comment: 32 pages, LaTeX2e, AmsLaTeX, minor typos correcte

Absorptive part of meson--baryon scattering amplitude and baryon polarization in chiral perturbation theory

We compute the spin asymmetry and polarization of the final-state baryon in its rest frame in two-body meson--baryon low-energy scattering with unpolarized initial state, to lowest non-trivial order in BChPT. The required absorptive amplitudes are obtained analytically at one-loop level. We discuss the polarization results numerically for several meson--baryon processes. Even at low energies above threshold, where BChPT can reasonably be expected to be applicable, sizable values of polarization are found for some processes

Addition theorems for spin spherical harmonics. I Preliminaries

We develop a systematic approach to deriving addition theorems for, and some other bilocal sums of, spin spherical harmonics. In this first part we establish some necessary technical results. We discuss the factorization of orbital and spin degrees of freedom in certain products of Clebsch-Gordan coefficients, and obtain general explicit results for the matrix elements in configuration space of tensor products of arbitrary rank of the position and angular-momentum operators. These results are the basis of the addition theorems for spin spherical harmonics obtained in part II

Un modelo Poissoniano para predecir la matriculación de vehículos en países europeos

En este artículo presentamos una modelización para la matriculación de vehículos en países de Europa mediante un proceso de Poisson Doblemente Estocástico con media aleatoria Normal truncada. Apoyándonos en trabajos previos acerca de este proceso, se amplía el estudio de características de éste. Asímismo, se hace una predicción de este proceso para los años 2000 y 2001

An integral approach to sludge handling in a WWTP operated for EBPR aiming phosphorus recovery: simulation of alternatives, LCA and LCC analyses

©IWA Publishing 2020. The definitive peer-reviewed and edited version of this article is published in Water Research, Volume 175, 15 May 2020, 115647, https://doi.org/10.1016/j.watres.2020.115647 and is available at www.iwapublishing.com.[EN] As phosphorus is a non-renewable resource mainly used to produce fertilizers and helps to provide food all over the world, the proper management of its reserves is a global concern since it is expected to become scarcer in the near future. In this work we assessed two different sludge line configurations aiming for P extraction and recovery before anaerobic digestion and compared them with the classical configuration. This study has been performed by simulation with the model BNRM2 integrated in the software package DESASS 7.1. Configuration 1 was based on the production of a PO4-enriched stream from sludge via elutriation in the primary thickeners, while Configuration 2 was based on the WASSTRIP (R) process and its PO4-enriched stream was mechanically obtained with dynamic thickeners. In both alternatives recovery was enhanced by promoting poly-phosphate (poly-P) extraction under anaerobic conditions, for which both configurations were fully evaluated in a full-scale WWTP. Both were also optimized to maximize phosphorus extraction. Their costs and life cycles were also analysed. The novelty of this research lies in the lack of literature about the integral evaluation of pre-anaerobic digestion P recovery from wastewaters. This study included a holistic approach and an optimization study of both alternatives plus their economic and environmental aspects. In Configuration 1, the PO4-P load in the recovery stream reached 43.1% of the total influent P load and reduced uncontrolled P-precipitation in the sludge line up to 52.9%. In Configuration 2, extraction was 48.2% of the influent P load and it reduced precipitation by up to 60.0%. Despite Configuration 1's lower phosphorus recovery efficiency, it had a 23.0% lower life cycle cost and a 14.2% lower global warming impact per hm(3) of treated influent than Configuration 2. Configuration 1 also reduced the TAEC by 17.6% and global warming impact by 2.0% less than Configuration 0.The LIFE Programme, the European Union's funding instrument for the environment and climate action, supported and co-funded this study as part of the LIFE ENRICH project (LIFE16 ENV/ES/000375).Roldán, M.; Bouzas, A.; Seco, A.; Mena, E.; Mayor, Á.; Barat, R. (2020). An integral approach to sludge handling in a WWTP operated for EBPR aiming phosphorus recovery: simulation of alternatives, LCA and LCC analyses. Water Research. 175:1-11. https://doi.org/10.1016/j.watres.2020.115647S111175Bouzas, A., Martí, N., Grau, S., Barat, R., Mangin, D., & Pastor, L. (2019). Implementation of a global P-recovery system in urban wastewater treatment plants. Journal of Cleaner Production, 227, 130-140. doi:10.1016/j.jclepro.2019.04.126Bradford-Hartke, Z., Lane, J., Lant, P., & Leslie, G. (2015). Environmental Benefits and Burdens of Phosphorus Recovery from Municipal Wastewater. Environmental Science & Technology, 49(14), 8611-8622. doi:10.1021/es505102vCieślik, B., & Konieczka, P. (2017). A review of phosphorus recovery methods at various steps of wastewater treatment and sewage sludge management. The concept of «no solid waste generation» and analytical methods. Journal of Cleaner Production, 142, 1728-1740. doi:10.1016/j.jclepro.2016.11.116Cornel, P., & Schaum, C. (2009). Phosphorus recovery from wastewater: needs, technologies and costs. Water Science and Technology, 59(6), 1069-1076. doi:10.2166/wst.2009.045Cullen, N., Baur, R., & Schauer, P. (2013). Three years of operation of North America’s first nutrient recovery facility. Water Science and Technology, 68(4), 763-768. doi:10.2166/wst.2013.260Egle, L., Rechberger, H., Krampe, J., & Zessner, M. (2016). Phosphorus recovery from municipal wastewater: An integrated comparative technological, environmental and economic assessment of P recovery technologies. Science of The Total Environment, 571, 522-542. doi:10.1016/j.scitotenv.2016.07.019Ferrer, J., Pretel, R., Durán, F., Giménez, J. B., Robles, A., Ruano, M. V., … Seco, A. (2015). Design methodology for submerged anaerobic membrane bioreactors (AnMBR): A case study. Separation and Purification Technology, 141, 378-386. doi:10.1016/j.seppur.2014.12.018Ferrer, J., Seco, A., Serralta, J., Ribes, J., Manga, J., Asensi, E., … Llavador, F. (2008). DESASS: A software tool for designing, simulating and optimising WWTPs. Environmental Modelling & Software, 23(1), 19-26. doi:10.1016/j.envsoft.2007.04.005Guedes, P., Couto, N., Ottosen, L. M., & Ribeiro, A. B. (2014). Phosphorus recovery from sewage sludge ash through an electrodialytic process. Waste Management, 34(5), 886-892. doi:10.1016/j.wasman.2014.02.021Guérin-Schneider, L., Tsanga-Tabi, M., Roux, P., Catel, L., & Biard, Y. (2018). How to better include environmental assessment in public decision-making: Lessons from the use of an LCA-calculator for wastewater systems. Journal of Cleaner Production, 187, 1057-1068. doi:10.1016/j.jclepro.2018.03.168Harrison, E. Z., Oakes, S. R., Hysell, M., & Hay, A. (2006). Organic chemicals in sewage sludges. Science of The Total Environment, 367(2-3), 481-497. doi:10.1016/j.scitotenv.2006.04.002Le Corre, K. S., Valsami-Jones, E., Hobbs, P., & Parsons, S. A. (2009). Phosphorus Recovery from Wastewater by Struvite Crystallization: A Review. Critical Reviews in Environmental Science and Technology, 39(6), 433-477. doi:10.1080/10643380701640573Lizarralde, I., Fernández-Arévalo, T., Manas, A., Ayesa, E., & Grau, P. (2019). Model-based opti mization of phosphorus management strategies in Sur WWTP, Madrid. Water Research, 153, 39-52. doi:10.1016/j.watres.2018.12.056Marti, N., Bouzas, A., Seco, A., & Ferrer, J. (2008). Struvite precipitation assessment in anaerobic digestion processes. Chemical Engineering Journal, 141(1-3), 67-74. doi:10.1016/j.cej.2007.10.023Nättorp, A., Remmen, K., & Remy, C. (2017). Cost assessment of different routes for phosphorus recovery from wastewater using data from pilot and production plants. Water Science and Technology, 76(2), 413-424. doi:10.2166/wst.2017.212Neethling, J. B., & Benisch, M. (2004). Struvite control through process and facility design as well as operation strategy. Water Science and Technology, 49(2), 191-199. doi:10.2166/wst.2004.0122Pastor, L., Marti, N., Bouzas, A., & Seco, A. (2008). Sewage sludge management for phosphorus recovery as struvite in EBPR wastewater treatment plants. Bioresource Technology, 99(11), 4817-4824. doi:10.1016/j.biortech.2007.09.054Peng, L., Dai, H., Wu, Y., Peng, Y., & Lu, X. (2018). A comprehensive review of phosphorus recovery from wastewater by crystallization processes. Chemosphere, 197, 768-781. doi:10.1016/j.chemosphere.2018.01.098Robles, Á., Aguado, D., Barat, R., Borrás, L., Bouzas, A., Giménez, J. B., … Seco, A. (2020). New frontiers from removal to recycling of nitrogen and phosphorus from wastewater in the Circular Economy. Bioresource Technology, 300, 122673. doi:10.1016/j.biortech.2019.122673Rodriguez-Garcia, G., Frison, N., Vázquez-Padín, J. R., Hospido, A., Garrido, J. M., Fatone, F., … Feijoo, G. (2014). Life cycle assessment of nutrient removal technologies for the treatment of anaerobic digestion supernatant and its integration in a wastewater treatment plant. Science of The Total Environment, 490, 871-879. doi:10.1016/j.scitotenv.2014.05.077Sena, M., & Hicks, A. (2018). Life cycle assessment review of struvite precipitation in wastewater treatment. Resources, Conservation and Recycling, 139, 194-204. doi:10.1016/j.resconrec.2018.08.009Shih, Y.-J., Abarca, R. R. M., de Luna, M. D. G., Huang, Y.-H., & Lu, M.-C. (2017). Recovery of phosphorus from synthetic wastewaters by struvite crystallization in a fluidized-bed reactor: Effects of pH, phosphate concentration and coexisting ions. Chemosphere, 173, 466-473. doi:10.1016/j.chemosphere.2017.01.088Van Dijk, K. C., Lesschen, J. P., & Oenema, O. (2016). Phosphorus flows and balances of the European Union Member States. Science of The Total Environment, 542, 1078-1093. doi:10.1016/j.scitotenv.2015.08.048Wang, J., You, S., Zong, Y., Træholt, C., Dong, Z. Y., & Zhou, Y. (2019). Flexibility of combined heat and power plants: A review of technologies and operation strategies. Applied Energy, 252, 113445. doi:10.1016/j.apenergy.2019.11344

Meniscectomía por Cirugía Artroscópica

El propósito de este trabajo es presentar la experiencia y valoración estadística de 83 artroscopias de rodilla realizadas por los autores, durante el año 1988, describiendo la patología hallada, la técnica empleada, complicaciones per y postoperatorias así como la estancia media hospitalaria de estos pacientes.With this work, the authors showed their experience and statistic evaluation of 83 arthroscopies of the knee in 1988, describing the pathological findings, technical procedure used, complications during and after the arthroscopy as well as the average stay of these patients in the hospital

Intermittency in Branching Processes

We study the intermittency properties of two branching processes, one with a uniform and another with a singular splitting kernel. The asymptotic intermittency indices, as well as the leading corrections to the asymptotic linear regime are explicitly computed in an analytic framework. Both models are found to possess a monofractal spectrum with $\varphi_{q}=q-1$. Relations with previous results are discussed.Comment: 20 pages, UCLA93/TEP/2

Cobalt (II) environment characterization in sol-gel thermochromic sensors

Optical absorption and magnetic properties of silica sol-gel monoliths doped with cobalt starting from different precursors and water/1-propanol molar ratios are investigated. Structural characterization of the sol-gel by X-ray absorption near-edge structure (XANES) spectroscopy and extended X-ray absorption fine structure (EXAFS) spectroscopy corroborate, that oxidising state of cobalt is Co^(2+). Furthermore, the Co^(2+) first neighbors are O atoms displaying a temperature transition from octahedral to tetrahedral coordination. The doped monoliths show thermochromic sensor activity ranging from 10 to 50⁰ C, which is related to the environment of Co^(2+) ions. The magnetic susceptibility also varies with Co^(2+) ions environment due to changes in the orbital contribution to the magnetic moment. Thus, we achieve a better understanding about environment of the Co^(2+) ions in the gel matrix and explain their reversible temperature behaviour in spite of the rigid state of the host matrix

La displasia congénita de cadera y el grupo sanguíneo

Este trabajo analiza la relación existente entre la displasia congénita de la cadera y el grupo sanguíneo. El estudio comprende 116 recién nacidos diagnosticados de displasia congenita de cadera a los que se le aplican los parámetros de grupo sanguí- neo de los sistemas A-B-O y Rh. Como grupo comparativo se calculan las frecuencias fenotípicas de la población española y de la población gallega para observar su comportamiento, lo que nos lleva a la conclusión de que los enfermos con displasia congénita de cadera presentan un patrón de antígenos eritrocitarios de superficie propio y distinto de la población normal.This work analyse the relationship between the Congenital Dysplasia of the Hip and blood group. 116 newborns diagnosed of Congenital Hip Dysplasia are included in the study, and in all of them are applied the parameters of ABO and Rh groups. As comparative group, it comput e the phenotypic frecuencies of Spanish and galician population to observe their behaviour. They conclude that the patients with Congenital Dysplasia of the Hip show a pattern of erythrocytic antigens of surface own and different of the normal population