Prevalencia de cordales inferiores retenidos, en jóvenes mediante clasificaciones de Winter y Pell-Gregory, en una clínica dental en Breña, 2016-2021

Objetivo: El objetivo del estudio fue determinar la prevalencia de cordales inferiores retenidos en jóvenes mediante clasificaciones de Winter y Pell-Gregory, en una Clínica Dental en Breña, entre los años 2016 y 2021. Materiales y Métodos: Se realizó un estudio tipo básico, porque su principal fuente fue la recolección de datos, de diseño no experimental, observacional de carácter transversal, descriptivo y retrospectivo, con una muestra de 200 radiografías panorámicas, los parámetros fueron registrados en una ficha de recolección de datos con la intención clasificar cada indicador, pero principalmente la inclinación y la posición ya que estas dependen de las clasificaciones de Winter y Pell- Gregory respectivamente. Resultados: Se obtuvo el resultado utilizando la clasificación de Winter en el que la inclinación más prevalente fue la horizontal con 94 (47%), seguida de la mesioangular 79 (39.5%). La posición según la clasificación de Pell-Gregory más prevalente fue IIA 70 (35%) seguidamente de IIB 68 (34%). Conclusiones: se concluye que según la clasificación de Pell- Gregory existe prevalencia en la posición IIA y según la clasificación de Winter existe prevalencia en la inclinación horizontal

Increased basolateral amygdala metabolic activity during flavor familiarization: an experimental study

Background: Novel flavors elicit a cautious neophobic response which is attenuated as the flavor becomes familiar and safe. The attenuation of neophobia reveals the formation of a safe memory. Previous lesion studies in rats have reported that basolateral amygdala integrity is required for taste neophobia, but not neophobia to flavor, i.e., taste linked to an odorous component. Accordingly, immunohistochemical analyses show that novel tastes induced higher basolateral amygdala activity when compared to familiar ones. However, a different role of basolateral amygdala in flavor attenuation of neophobia is suggested by lesion studies using a vinegar solution. Studies assessing basolateral amygdala activity during flavor attenuation of neophobia are lacking. Thus, we quantified cytochrome oxidase as an index of basolateral amygdala activity along the first and second vinegar exposures in order to assess flavor neophobia and attenuation of neophobia. Methods: We exposed adult male Wistar rats either once or twice to a 3% cider vinegar solution or water, and compared the basolateral amygdala, piriform cortex and caudate putamen brain metabolic activity using cytochrome c-oxidase histochemistry. Results: We found increased flavor intake and cytochrome c-oxidase histochemistry activity during the second exposure in basolateral amygdala, but not in the piriform cortex and caudate/putamen. Conclusions: The main finding of the study is that BLA metabolic activity was higher in the group exposed to a familiar vinegar solution than in the groups exposed to either water or a novel vinegar solution.6 página

Effect of structural modifications on the drying kinetics of foods: changes in volume, surface area and product shape

Macro and micro-structural changes take place during food dehydration. Macro-structural changes encompass modifications in shape, area and volume. Studies of such changes are important because dehydration kinetics (essential for calculating industrial dryers) may be highly influenced by changes in food shape and dimensions. The overall changes in volume, surface area (?shrinkage?) and shape (Heywood factor, with provides a close description of food shape) were determined experimentally, and the results were correlated with simple expressions. Hence, although dehydration kinetics can be modeled with simplified overall shrinkage expressions, the possibility of selecting a suitable geometry and predicting the characteristics dimensions will provide higher accuracy. An additional unresolved problem is the lack of a general model that predicts macro-structural changes for various foods and diverse geometries. In this work, based on experimental data of sweet and sour cherries, and rose hip fruits, a simplified general model to predict changes in volume and surface area are proposed. To estimate how the changes in characteristic dimensions affect the kinetic studies, experimental drying curves for the three fruits by means of a diffusional model considered the following variants for the characteristic dimensions: (i) The radius of the fresh food, assumed constant; (ii) The radius of the partially dehydrated product; (iii) The radius predicted by the correlation for structural changes, especially volume, obtained in this work and generalized for the three fruits, and (iv) to demonstrate the need to study the macro-structural changes for all dehydrated foods, also be present the case of a restructured food.Fil: de Michelis, Antonio. Instituto Nacional de Tecnología Agropecuaria. Centro Regional Patagonia Norte. Estación Experimental Agropecuaria San Carlos de Bariloche. Agencia de Extension Rural El Bolson; Argentina. Provincia de Buenos Aires. Gobernación. Comisión de Investigaciones Científicas. Centro de Investigación y Desarrollo en Criotecnología de Alimentos. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Centro de Investigación y Desarrollo en Criotecnología de Alimentos. Universidad Nacional de la Plata. Facultad de Ciencias Exactas. Centro de Investigación y Desarrollo en Criotecnología de Alimentos; ArgentinaFil: Marquez, Carlos Alberto. Universidad Nacional del Comahue. Facultad de Ciencias y Tecnologia de los Alimentos; ArgentinaFil: Mabellini, Alejandra. Universidad Nacional del Comahue. Facultad de Ciencias y Tecnologia de los Alimentos; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Ohaco, Elizabeth. Universidad Nacional del Comahue. Facultad de Ciencias y Tecnologia de los Alimentos; ArgentinaFil: Giner, Sergio Adrian. Provincia de Buenos Aires. Gobernación. Comisión de Investigaciones Científicas. Centro de Investigación y Desarrollo en Criotecnología de Alimentos. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Centro de Investigación y Desarrollo en Criotecnología de Alimentos. Universidad Nacional de La Plata. Facultad de Ciencias Exactas. Centro de Investigación y Desarrollo en Criotecnología de Alimentos; Argentin

La pena de muerte desde la bioética y los derechos humanos

Se ofrece una reflexión de la pena de muerte, que parte de premisas esenciales desde la bioética y los derechos humanos. Se plantean algunas generalidades de esta disciplina, dado que orientan a un cuestionamiento respecto al aporte de la ciencia y la tecnología para llevar a cabo ejecuciones más humanas. Enseguida se recurre a los conceptos de vida, persona y dignidad para enmarcar el argumento en los derechos humanos. Se retoman algunas sentencias de documentos internacionales apelando a un desarrollo del hombre desde la ética: la práctica de la pena máxima, por el contrario, lo retiene. Así pues, se anticipa que lo humano nunca se hallará en la aniquilación de su propio género.Se ofrece una reÁexión de la pena de muerte, que parte de premisas esenciales desde la bioética y los derechos humanos. Se plantean algunas generalidades de esta disciplina, dado que orientan a un cuestionamiento respecto al aporte de la ciencia y la tecnología para llevar a cabo “ejecuciones más humanas”. Enseguida se recurre a los conceptos de vida, persona y dignidad para enmarcar el argumento en los derechos humanos. Se retoman algunas sentencias de documentos internacionales apelando a un desarrollo del hombre desde la ética: la práctica de la pena máxima, por el contrario, lo retiene. Así pues, se anticipa que lo humano nunca se hallará en la aniquilación de su propio género

Model predictive control: a review of its applications in power electronics

Model-based predictive control (MPC) for power converters and drives is a control technique that has gained attention in the research community. The main reason for this is that although MPC presents high computational burden, it can easily handle multivariable case and system constraints and nonlinearities in a very intuitive way. Taking advantage of that, MPC has been successfully used for different applications such as an active front end (AFE), power converters connected to resistor inductor RL loads, uninterruptible power supplies, and high-performance drives for induction machines, among others. This article provides a review of the application of MPC in the power electronics area

Relating Spatial Quality of Public Transportation and the Most Visited Museums: Revisiting Sustainable Mobility of Waterfronts and Historic Centers in International Cruise Destinations

Museums are main tourist resources for independent cruise passengers in cultural cruise destinations. However, their influence on cruise destinations is scarcely analyzed. The aim of this paper was to focus on two questions: What distribution of museums facilitates a sustainable mobility of cruise tourists in balance with urban needs? And which factors affect the potential use of both means of sustainable travel—soft mobility and public transport—at cruise destinations? The network topological features of main museums were analyzed to compare similar features among tourism destinations. A topological study based on the model of the three urban fabrics was related to the objective quality of PT. This allowed for a greater walkability or potential use of PT to be estimated. The results allowed for a diverse sample of cultural tourism port cities with cruise activity to be classified in three centralized levels and two decentralized ones. Results indicated that centralized networks are more prone to cruise tourists, while decentralized networks are more related to main cultural destinations. Finally, the discussion section analysed recommendations and measures to improve sustainable mobility and the planning of new museums. The results of this paper will be of interest to cultural and transport managers at these types of destinations.This article showcases the results of the “Strategies to recover the public space and residential use over gentrification and touristification in Malaga” research (UMA 20.01), financed by Andalusian Govern for Development, Infrastructures and Spatial Organization. The open access fee is funded by Universidad de Malaga/CBUA

Cognitive agent based on the 16PF, for analysis of human personality

This paper presents the development of an architecture for a Multi-Agent System Based on SocialRational Personality, which seeks the human personality empathy, based on the 16 Personality Factor (16 PF) of Raymond Cattell, and the primary emotions methodology of Paul Ekman. Intelligent Agents will be used for learning and knowledge acquisition, Vision Techniques for pre-processing images, Neural Networks for people and gestures recognition, Fuzzy Logic to ponder emotions and Clustering for grouping similar personalities

Análisis de la resistencia a la compresión del concreto f´c=210kg/cm² aplicando relave minero, Huaraz 2021

La tesis plantea como objetivo evaluar, analizar y determinar cómo influye el relave minero en resistencia a la compresión de concreto f´c=210kg/cm², sustituyendo el agregado fino por relave en porcentajes de 6%, 12%, 25% y 50%, estableciendo comparaciones de diferentes antecedentes y de las teorías que se postulan. La tesis responde al diseño de investigación experimental la cual se elaboró por medio de la manipulación de las variables; su finalidad es aplicada y cuantitativa; asimismo se enmarca sobre una población finita. Los resultados que obtuvo la investigación permitieron determinar el cumplimiento de los objetivos específicos, tales como: determinar la característica física y química del relave minero, con una característica mineralógica obteniendo un 70.40% de Cuarzo (2); determinar cómo influye el relave minero en la resistencia de compresión, estableciendo que con el porcentaje de 12% influye en esta propiedades el concreto; asimismo se evaluó y analizaron los resultados obtenidos en los ensayos del concreto fresco, de donde con 50% de relave presenta un asentamiento mayor. De lo expuesto, se verificó que el relave minero es un material alternativo aprovechable, y apta para el uso en la elaboración de concretos. Del mismo modo el uso del relave influye en la resistencia a la compresión, manteniéndose, mejorándolo dentro de los rangos permisibles

Revealing the beneficial effects of Ge doping on Cu2ZnSnSe4 thin film solar cells

Kesterite (CZTSe) is a promising thin film photovoltaic absorber material due to its composition of more earth abundant materials compared to mature thin film photovoltaic technologies. Up to now, power conversion efficiencies are still lower and its main problem is the low open circuit voltage (Voc). Recently, a novel sintering approach using a nanometric Ge layer showed a large increase in device performance and especially in Voc. In this work, in-depth solar cell characterization as well as Raman and Photoluminescence studies of devices employing different Ge doped CZTSe absorber layers is presented. The main focus is to reveal the beneficial effects of Ge doping and furthermore investigate the interaction of Ge and Na. For low Ge doping an increase in charge carrier concentration is observed, resulting in devices with Voc of 460 mV, which corresponds to Voc deficits (Eg/q–Voc) of 596 mV a value comparable to current record devices. For high Ge amounts admittance spectroscopy measurements identified the appearance of a deep defect which can explain the observed deterioration of solar cell performance. Additional Na provided during crystallization of high Ge doped devices can reduce the density of this deep defect and recover device performance. These results indicate that Na plays an important role in defect passivation and we propose a defect model based in the interaction of group IV elements and Na with Cu vacancies