Duroc and Iberian Pork Neural Network Classification by Visible and Near Infrared Reflectance Spectroscopy

a b s t r a c t Visible and near infrared reflectance spectroscopy (VIS/NIRS) was used to differentiate between Duroc and Iberian pork in the M. masseter. Samples of Duroc (n = 15) and Iberian (n = 15) pig muscles were scanned in the VIS/NIR region (350-2500 nm) using a portable spectral radiometer. Both mutual information and VIS/NIRS spectra characterization were developed to generate a ranking of variables and the data were then processed by artificial neural networks, establishing 1, 3, or 10 wavelengths as input variable for classifying between the pig breeds. The models correctly classified >70% of all problem assumptions, with a correct classification of >95% for the three-variable assumption using either mutual information ranking or VIS/NIRS spectra characterization. These results demonstrate the potential value of the VIS/ NIRS technique as an objective and rapid method for the authentication and identification of Duroc and Iberian pork

Una propuesta de tipología de sistemas de partidos para regímenes democráticos y autoritarios pluralistas. Su aplicación a los países del Magreb

Since the pioneering work by Sartori, few typologies have been created for party systems and the most recent ones have focused on one or two classification criteria, using democracies as their reference. This article proposes a typology of party systems that can be applied to both democratic and pluralist authoritarian regimes. It is based on four dimensions: competition, party system stability, number and balance between parties and polarization. To verify its validity, the typology was applied to three political regimes of Maghreb: Tunisia (defective democracy) Morocco (quasi-competitive authoritarianism) and Algeria (hegemonic authoritarianism). Its application corroborates the validity of the typology as a possible way of characterizing party systems and allowing transnational research.Desde el trabajo de Sartori, son escasas las tipologías de sistemas de partidos elaboradas, y las más recientes se centran en uno o dos criterios de clasificación, teniendo como referente las democracias. Este artículo propone una tipología de sistemas de partidos aplicable tanto en regímenes democráticos como en autoritarios pluralistas. Está basada en cuatro dimensiones: competencia, estabilidad del sistema de partidos, número y equilibrio entre partidos y polarización. Para verificar su validez, la tipología se aplica a tres regímenes políticos del Magreb: Túnez (democracia defectiva), Marruecos (autoritarismo cuasi competitivo) y Argelia (autoritarismo hegemónico). Su aplicación corrobora la validez de la tipología como forma de caracterizar los sistemas de partidos y permitir las investigaciones comparadas transnacionales

Multiplicity fluctuations in the string clustering approach

We present our results on multiplicity fluctuations in the framework of the string clustering approach. We compare our results --with and without clustering formation-- with CERN SPS NA49 data. We find a non-monotonic behaviour of these fluctuations as a function of the collision centrality, which has the same origin as the observed fluctuations of transverse momentum: the correlations between the produced particles due to the cluster formation.Comment: 16 pages, 4 figures, revte

Predictive Psychosocial Factors of Child-to-Parent Violence in a Sample of Mexican Adolescents

The aim of this study was to carry out a psychosocial analysis of child-to-parent violence (CPV) in a sample of school adolescents, considering a set of individual variables (psychological distress, problematic use of social networking sites, and perceived non-conformist social reputation) and family variables (open and problematic communication with parents) according to sex. The sample consisted of 3, 731 adolescents (54% boys), aged between 14 and 16 years (M = 14.6 years, SD = 0.567), from the state of Nuevo León, Mexico. The scores of the boys and girls were analyzed to check for differences. Also, correlations between all the study variables were calculated. Finally, a multiple stepwise regression analysis was carried out for the total sample and also for boys and girls separately. Results confirmed the important role of individual variables as predictors of CPV in boys and girls. The main difference between boys and girls was observed in the predictive weight of problematic use of social networking sites, which was higher in girls than in boys. Open communication with the father was a significant factor for predicting the decrease of CPV levels in the case of boys, while open communication with the mother predicted the decrease of CPV in girls. Problematic communication with the mother showed similar values in boys and girls when predicting CPV, however, the predictive weight of problematic communication with the father was higher in girls than in boys. These results are interesting and have important implications for the prevention of CPV

On the Geometry of Supersymmetric Quantum Mechanical Systems

We consider some simple examples of supersymmetric quantum mechanical systems and explore their possible geometric interpretation with the help of geometric aspects of real Clifford algebras. This leads to natural extensions of the considered systems to higher dimensions and more complicated potentials.Comment: 18 page