Quantum Entanglement in (d−1)(d-1)-Spherium

There are very few systems of interacting particles (with continuous variables) for which the entanglement of the concomitant eigenfunctions can be computed in an exact, analytical way. Here we present analytical calculations of the amount of entanglement exhibited by $s$-states of \emph{spherium}. This is a system of two particles (electrons) interacting via a Coulomb potential and confined to a $(d-1)$-sphere (that is, to the surface of a $d$-dimensional ball). We investigate the dependence of entanglement on the radius $R$ of the system, on the spatial dimensionality $d$, and on energy. We find that entanglement increases monotonically with $R$, decreases with $d$, and also tends to increase with the energy of the eigenstates. These trends are discussed and compared with those observed in other two-electron atomic-like models where entanglement has been investigated.Comment: 14 pages, 6 figures. J. Phys. A (2015). Accepte

A note on representation of references

We consider a class of relations which includes irreflexive preference relations and interdependent preferences. For this class, we obtain necessary and sufficient conditions for representation of the relation by two numerical functions in the sense of a < x if and only if u(a) < v(x)

A note on representation of references.

We consider a class of relations which includes irreflexive preference relations and interdependent preferences. For this class, we obtain necessary and sufficient conditions for representation of the relation by two numerical functions in the sense of aPreference; Continuous representation; Pseudotransitivity; Biorders;

Una nota sobre la representación numérica de relaciones de preferencia

En esta nota se estudia la existencia de representación de una preferencia < definida en un espacio topológico X mediante dos funciones reales u y v, continuas en X de modo que x < y si o sólo si u(x) < v(y). Generalizamos al easo pseudotransitivo un resultado de P.K. Monteiro relativo a preórdenes completos para obtener, en el marco de los espacios topológicos conexos por arcos, condiciones necesarias y suficientes para la existencia de representación

Characterization of a birnavirus isolated from diseased turbot cultured in Spain

7 pages, 5 figures, 2 tables.During 1989, light but persistent mortalities were detected in a turbot Scophthalmus maximus L. farm in Galicia (northwestern Spain) and a virus with the characteristics of a birnavirus was isolated. The purpose of this study was to characterize the viral agent and determine the susceptibility of turbot to this virus. Electron microscopic examination revealed that the particles were isometric, hexagonal and unenveloped with an average diameter of 58 to 60 nm. The molecular weights of the RNA segments were 1.9 and 2.0 x 10(up to 6) daltons. The cells most susceptible to the turbot isolate were the CHSE-214, FHM and RTG-2 lines and the optimal temperature range for its replication was 15 to 2OºC. The RNA and polypeptide electropherotypes show that this virus resembles the Ab serotype of infectious pancreatic necrosis virus (IPNV); however, it differs in that it replicates in the FHM cell line and is not neutralized by antisera to the classical serotypes of IPNV. Infectivity trials conducted in turbot of dlfferent sizes indicated that the virus produced mortality only in small fish (2 g), although the larger fish (30 g) harbored the virus for at least 35 d. Fish inoculated with this isolate showed no pancreatic necrosis although necrosis of the hematopoietic elements of the kidney and spleen was detected.This work was supported by Grants MAR 89-0270 from the Comision Interministenal de Ciencia y Tecnologia (CICYT), and by XUGA 70708888 from Xunta de Galicia, Spain. Beatriz Novoa acknowledges the Ministerio de Educacion y Ciencia (Spain) for a research fellowship.Peer reviewe

Diagnóstico de calidad del aire en espacios de trabajo en el edificio central de la Universidad Nacional de San Juan, Argentina

Asegurar condiciones de higiene del aire mediante sistemas de ventilación y apertura de ventanas adecuados, conduce a mejorar la productividad de los usuarios en sus tareas y a prevenir el síndrome del edificio enfermo. La norma DIN EN 13779 (2007), indica valores de referencia sobre calidad del aire en función de la concentración de CO2. Es objetivo diagnosticar y definir condiciones de habitabilidad para usuarios de espacios de trabajo. Para ello, se llevan a cabo mediciones con sensores y encuestas en diferentes épocas del año. La correlación de los datos del relevamiento permite elaborar indicadores de calidad. Se observa que los limites de calidad propuestos por la norma son estrictos pudiendo afectar la eficiencia del edificio ya que más del 90% de las mediciones revelan nivel de calidad de aire “media”, sobre lo cual, sólo el 15% de los usuarios manifiestan disconformidad.The paper reports the follow-up of a semi-continuous anaerobic reactor operation, fed at a constant organic loading rate (OLR) of 1.1kgVSm-3d -1 with both the organic fraction of municipal solid waste (OFMSW) and fruit and vegetable wastes during 12 months. Biogas production, physical-chemical parameters, and stability indicators: partial alkalinity/total alkalinity and volatile fate acid/total alkalinity were measured in the effluents. Total biogas yield was 112 lkgVS-1in normal pressure and temperature conditions (NPTC). This result is lower than the yield attained with other waste sources in the same reactor. Stability indicators showed a well development of the entire anaerobic process. In addition to this, a reduction in COD (chemical oxygen demand), VS (volatile solids) of 77% and 47.5% respectively, denoted an efficient degradation of the organic matter. However, high COD values obtained in the effluents show the need of its treatment before itsfinal disposal.Asociación Argentina de Energías Renovables y Medio Ambiente (ASADES

Desarrollo de un scanner 3D

En el presente trabajo se muestra un primer prototipo de un escáner 3D detallando su construcción mecánica, los circuitos electrónicos que lo componen y la programación asociada a su funcionamiento. Para el mismo se utilizaron componentes de fácil adquisición y programas de desarrolló del tipo libre. Como resultado se llegó a un modelo tridimensional numérico de objetos físicos pudiéndose recomponer este objeto mediante una impresora 3D, mostrando de esta forma su utilidad y precisión alcanzada

Microflora associated with healthy and diseased turbot (Scophthalmus maximus) from three farms in northwest Spain

14 páginas, 4 tablas, 3 figurasA comparative analysis of the microbiological quality of three turbot (Scophthabnus maximus) farms (A, B, and C) located in Galicia (northwest Spain) is given. The microbial load and types of bacteria in the internal organs (liver and kidney) of apparently healthy fish was monitored over a year, and all the disease problems occurring during this survey were analyzed. The percentage of healthy turbot in which positive bacterial growth was obtained was relatively high in the three ongrowing facilities. Farm A exhibited the poorest conditions of fish health with an average of 42% fish infected, while farm B showed the best microbiological quality with 27% of turbot harbouring bacteria in the internal organs. In all three farms, a wide range of bacteria was found in healthy turbot with Vibrio ( V. splendidus-V pelagius, Vjisheri-V harveyi and Vibrio spp.) and Pseudomonas spp. being the predominant groups comprising at least 80% of the total bacterial isolates in each farm. The highest number of pathological problems (22 ) with the most diverse bacterial flora occurred in farm A. Vibrio spp. and Pseudomonas spp. were the most prevalent bacteria recovered from diseased turbot. Haemorrhages in palate and jaws, tail and fins, and ulcerative lesions were the most frequent external clinical signs of diseased fish recorded in the three farms. However, it was not possible to associate a particular bacterial species with a specific pathology. Routine use in farm A of oxolinic acid and nitrofurantoin may have led to the development in the Vibrio strains of resistances to both chemotherapeutants (up to 25%).This study was supported by Grants MAR 9 l- 1133~CO2-0 1 and MAR 89- 0270 from the Comision Interministerial de Ciencia y Tecnologia (CICYT), XUGA 8030389 from Xunta de Galicia (Spain), and EUREKA project No. EU-347, between Spain and Norway.Peer reviewe

Flexibatteriosi da Tenacibaculum maritimum sierotipo O3 in pesce capone (Chelidonichthys lucerna L.) d’allevamento: prima segnalazione in Italia. First report of Tenacibaculum maritimum serotype O3 infecton in cultured tub gurnard (Chelidonichthys lucerna) in Italy.

The present study describes the first isolation of Tenacibaculum maritimum from tub gurnard (Chelidonichthys lucernus L.), cultured in Italy. After 3 days shipment from one fish farm to our laboratory facilities, a group of 20 tub gurnard showed eroded mouth, rotten fins and severe skin ulcerative lesions. Mortality reached 90% of the population in 9 days. Traditional bacteriological and PCR analysis allowed the identification of the causative agent as T. maritimum. Serological characterization of the isolate demonstrated that it belongs to serotype O3. Histopathological examination showed severe skin necrosis, dermis congestion associated with eterophilic and macrophagic infiltration. Immunohistochemical analysis, using specific polyclonal antiserum against T. maritimum serotype O3, allowed the visualization of numerous positively stained macrophagic cells. The high mortality observed during the outbreak leads to consider the T. maritimum as a potential risk for the culture of tub gurnard

Evaluación del daño ocasionado por la paloma torcaza (Zenaida auriculata) en el cultivo de soja, en las campañas 2011/2012 y 2012/2013

La expansión de la frontera agrícola, el desmonte de grandes áreas naturales -que generó paisajes en mosaicos- y la introducción de nuevos cultivos en el país, han beneficiado a algunas especies de aves que se convirtieron en perjudiciales para la agricultura. Así por ejemplo, la cotorra (Myiopsitta monachus) y la paloma (Columba maculosa, C. picazuro y Zenaida auriculata) ocasionan daños económicos en los cultivos de girasol, soja, sorgo, maíz, trigo y cebada cervecera, entre otros (Ares et al., 1998).Fil: Scalora, Augusto S.. Gobierno de Tucumán. Ministerio de Desarrollo Productivo. Estación Experimental Agroindustrial Obispo Colombres; ArgentinaFil: Casmuz, Augusto Sebastián. Gobierno de Tucumán. Ministerio de Desarrollo Productivo. Estación Experimental Agroindustrial Obispo Colombres; ArgentinaFil: Cazado, Lucas Emiliano. Gobierno de Tucumán. Ministerio de Desarrollo Productivo. Estación Experimental Agroindustrial Obispo Colombres; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Aralde, Marcos R.. Gobierno de Tucumán. Ministerio de Desarrollo Productivo. Estación Experimental Agroindustrial Obispo Colombres; ArgentinaFil: Aybar Guchea, Matías. Gobierno de Tucumán. Ministerio de Desarrollo Productivo. Estación Experimental Agroindustrial Obispo Colombres; ArgentinaFil: Gómez, Mario. Gobierno de Tucumán. Ministerio de Desarrollo Productivo. Estación Experimental Agroindustrial Obispo Colombres; ArgentinaFil: Fadda, Lucas A.. Gobierno de Tucumán. Ministerio de Desarrollo Productivo. Estación Experimental Agroindustrial Obispo Colombres; ArgentinaFil: Colledani Toranzo, Gustavo A.. Gobierno de Tucumán. Ministerio de Desarrollo Productivo. Estación Experimental Agroindustrial Obispo Colombres; ArgentinaFil: Fernández, José Luis. Gobierno de Tucumán. Ministerio de Desarrollo Productivo. Estación Experimental Agroindustrial Obispo Colombres; ArgentinaFil: Vera, Martin A.. Gobierno de Tucumán. Ministerio de Desarrollo Productivo. Estación Experimental Agroindustrial Obispo Colombres; ArgentinaFil: Gómez, César Horacio. Gobierno de Tucumán. Ministerio de Desarrollo Productivo. Estación Experimental Agroindustrial Obispo Colombres; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Gastaminza, Gerardo Alfredo. Gobierno de Tucumán. Ministerio de Desarrollo Productivo. Estación Experimental Agroindustrial Obispo Colombres; Argentin