Superconducting/magnetic three state nanodevice for memory and reading applications

We present a simple nanodevice that can operate in two modes: i) three-state memory and ii) reading device. The nanodevice is fabricated with an array of ordered triangular-shaped nanomagnets embedded in a superconducting thin film. The input signal is ac current and the output signal is dc voltage. Vortex ratchet effect in combination with out of plane magnetic anisotropy of the nanomagnets is the background physics which governs the nanodevice performance.Comment: 10 pages, 4 figure

Auto cuido en adolescentes de quinto y sexto grado, escuela nicarao, comunidad las banquitas municipio de Matagalpa, periodo agosto 2015 a diciembre 2016

La presente investigación titulada “Auto cuido en adolescentes de quinto y sexto grado de la escuela Nicarao, comunidad las Banquitas municipio de Matagalpa durante el periodo agosto 2015 a diciembre 2016”. Se realizó con la metodología de Investigación Acción Participativa (IAP), es un método de intervención social que resalta la participación de la gente y los fines que persigue; la investigación acción participativa supone la simultaneidad del proceso de conocer e intervenir, por ser investigación constituye un conjunto de procedimientos operacionales y técnicos, para adquirir un conocimiento útil para la población con el propósito de que pueda actuar transformadoramente sobre la realidad social en la que está inserta. Por ser acción, la misma actividad de investigación genera procesos de actuación de la gente involucrada en el programa. El modo de hacer el estudio ya es acción al menos de organización, movilización, sensibilización y concienciación. Por ser participación supone una complicación en el trabajo de los investigadores social y de la gente involucrada. Si estas relaciones de cooperación se establecen adecuadamente desde las primeras fases del trabajo se puede lograr un cruzamiento fertilizante y enriquecedor entre las experiencias/ vivencias de la gente y los conocimientos teóricos y metodológicos de los investigadores. La investigación se originó en el compromiso en la construcción de hábitos para fortalecer el auto cuido en los actores de investigación y con estudiantes de trabajo social, con el objetivo de acompañar un proceso de transformación de las prácticas de auto cuido en los adolescentes. Entre los principales hallazgos que arrojo la investigación están los factores que a lo interno del grupo contribuyen a un mejor auto cuido en las y los adolescentes, desde el ámbito personal familiar y social, así validando la pertinencia delas metodologías participativas en los procesos de intervención social. PALABRAS CLAVES: Auto cuido, Adolescentes, Prácticas, Manifestacione

Hacia una Antropología compartida. Reflexiones, experiencias y propuestas acerca de la fotografía participativa en investigación antropológica

Este artículo tiene dos objetivos principales. En primer lugar, trazar un recorrido por las experiencias colaborativas a través de la fotografía y el video en Antropología, y en segundo lugar, contextualizar y mostrar los resultados de una investigación realizada recientemente sobre proyectos de fotografía participativa impulsados desde colectivos de fotógrafos documentales. Para estos objetivos me he centrado en trabajos pioneros y en autores que han puesto a prueba este tipo de metodologías con niños y adolescentes, escenario de mi trabajo de campo. Esta investigación, que está en sus comienzos, pretende buscar sinergias con otros profesionales y poder así establecer teorías y colaboraciones de cara a próximos proyectos de investigación aplicada a través del uso de los medios audiovisuales. This article has two main objectives. Firstly, to portray the diverse collaborative photography and video experiences in Anthropology. Secondly, to contextualize and share the results of recent research on participatory photography projects promoted by documentary photography collectivities. To this end, I have focused on pioneering works and authors who have tested these methodologies with children and adolescents who are the subject of my fieldwork. This research, which is at a commencing stage, aims to establish synergies with other professionals and therefore establish theories and collaborations in regards to future applied research projects through the use of audiovisual media

Using Deep Convolutional Neural Network for Emotion Detection on a Physiological Signals Dataset (AMIGOS)

Recommender systems have been based on context and content, and now the technological challenge of making personalized recommendations based on the user emotional state arises through physiological signals that are obtained from devices or sensors. This paper applies the deep learning approach using a deep convolutional neural network on a dataset of physiological signals (electrocardiogram and galvanic skin response), in this case, the AMIGOS dataset. The detection of emotions is done by correlating these physiological signals with the data of arousal and valence of this dataset, to classify the affective state of a person. In addition, an application for emotion recognition based on classic machine learning algorithms is proposed to extract the features of physiological signals in the domain of time, frequency, and non-linear. This application uses a convolutional neural network for the automatic feature extraction of the physiological signals, and through fully connected network layers, the emotion prediction is made. The experimental results on the AMIGOS dataset show that the method proposed in this paper achieves a better precision of the classification of the emotional states, in comparison with the originally obtained by the authors of this dataset.This research project is financed by theGovernment of Colombia, Colciencias and the Governorateof Boyac

Aspidoscelis costatus costatus (Squamata, Teiidae): high elevation clutch production for a population of whiptail lizards

Artículo del tamaño de nidada en la lagartija Aspidoscelis costatus costatus.Clutch size and number of clutches per reproductive cycle are important life history traits that can be influenced by anatomical, physiological, evolutionary, and ecological factors. This report on the clutch size and number of clutches of an endemic Mexican whiptail lizard, Aspidoscelis costatus costatus (Cope, 1878), is based on a study of population at an unsually high elevation for a member of this genus. The study site is located in Ixtapan de la Sal, southeastern Estado de México, Central Mexico, at 2090 m a.s.l. Lizards were sampled in June 2006, and from May to July 2007, where females of Aspidoscelis costatus costatus were collected by hand along a drift fence. Female reproductive condition was evaluated based on abdominal palpation for presence of developing eggs; clutch size was determined by actual counts of either vitellogenic follicles or oviductal eggs. The smallest reproductive female was 77 mm snout vent length; females produced a minimum of two clutches during the breeding season, the mean clutch size of 6.5 eggs (n = 33) was one of the largest reported for the genus. However, both length and width of its eggs, and the relative clutch mass have not been diminished by development of a large clutch. Additionally, comparisons of clutch size were undertaken within the polytypic A. costatus complex, within the genus Aspidoscelis, and between certain genera of whiptail lizards. This apparently represents the first study of whiptail lizards (genus Aspidoscelis), assessing the aforementioned reproductive characteristics, in a population above 2000 m

Reproductive activity in males of Sceloporus variabilis: Little time to rest, long time to breed

Los reptiles presentan una gran variedad de patrones reproductores, que, en el caso de los machos, van desde diferencias en la duración del ciclo reproductor (Huang, 1997; Lozano et al., 2015), la época (primavera y/o verano, época de lluvias y/o sequía) en que se lleva a cabo (Vitt y Goldberg, 1983; Ramírez-Pinilla, 1991; Ferreira et al., 2002; Goldberg, 2008) o si la actividad es continua o estacional (Méndez-de la Cruz et al., 2015). La actividad reproductora continua, es aquélla donde la producción de espermatozoides es constante durante todo el año y aunque suele ser asociada a especies tropicales (Sherbrooke, 1975; Vial y Stewart, 1985; Van Sluys, 1993), se ha registrado en especies de clima templado (Hernández-Gallegos et al., 2002; Lozano et al., 2015). En contraste, la actividad reproductora estacional es aquélla donde los machos llevan a cabo la gametogénesis en periodos específicos del año, generalmente en primavera o verano/otoño, y está típicamente asociada a especies de clima templado (Abu-Zinadah, 2008; Goldberg, 2011; Rheubert et al., 2014). De igual modo, la actividad reproductora estacional también ha sido registrada en especies tropicales (Ochotorena et al., 2005; Granados-González et al., 2017).The reproductive activity of reptiles is typically assessed using monthly sampling. The spermatogenic cycle of Sceloporus variabilis was recently assessed using the aforementioned methodology, and only two spermatogenic phases (recrudescence and maximum activity) were observed. The authors hypothesized that quiescence and regression must occur in a short period (less than a month), which was not visualized by their monthly sampling methods. Thus, the entire spermatogenic cycle displayed by this species may have not been adequately represented. The present study assessed the spermatogenic cycle of S. variabilis in those months where the spermatogenic activity passes from maximum activity (July) to recrudescence (August) using weekly sampling to test the hypothesis that quiescence and regression do indeed occur. The results showed a regression period for 2 weeks, whereas quiescence was not observed. These results lead us to two hypotheses: (a) quiescence occurs in a very short period (days/hours) or (b) does not occur in this species. The data generated in this study suggest that species exhibiting rapid changes in spermatogenic activity need to be assessed at more frequent intervals to accurately depict the spermatogenic stages.CONACY

Identification of voltage-dependent Ca2+ channels in sea urchin sperm

AbstractFunctional evidence indicates that voltage-dependent Ca2+ (Cav) channels participate in sea urchin sperm motility and the acrosome reaction (AR), however, their molecular identity remains unknown. We have identified transcripts for two Ca2+ channel α1 subunits in sea urchin testis similar in sequence to Cav1.2 and Cav2.3. Antibodies against rat Cav1.2 and Cav2.3 channels differentially label proteins in the flagella and acrosome of mature sea urchin sperm. The Cav channel antagonists nifedipine and nimodipine, which inhibit the AR, diminish the intracellular Ca2+ elevation induced by a K+-induced depolarization in valinomycin-treated sperm. These findings reveal that Cav1.2 and Cav2.3 channels could participate in motility and/or the AR in sea urchin sperm

¿Es posible evaluar la dimensión social de la sustentabilidad? Aplicación de una metodología en dos comunidades campesinas del valle de Toluca, México

El artículo realiza una evaluación de los aspectos sociales de la sustentabilidad en dos comunidades campesinas del valle de Toluca, utilizando un esquema de atributos-criterios-indicadores. Una de las comunidades presentó mejores valores en atributos como estabilidad, resiliencia, equidad y autogestión; mientras que ambas comunidades obtuvieron niveles similares (de medios a al tos) en los atributos de productividad, adaptabilidad y confiabilidad. La organización so cial jugó un papel preponderante en la sustentabilidad económica y ambiental del manejo de recursos naturales por las comunidades

Optimum Efficiency on Broadcasting Communications

This chapter is devoted to review a set of new technologies that we have developed and to show how they can improve the process of broadcasting in two principal ways: that is, one of these avoiding the loss of transmission signals due to abrupt changes in sign of the diffraction index and the other, preventing the mutual perturbation between signals generating information leak. In this manner, we propose the join of several of the mentioned technologies to get an optimum efficiency on the process of broadcasting communications showing the theoretical foundations and discussing some experiments that bring us to create the plasma sandwich model and others. Despite our very innovative technology, we underline that a complete recipe must include other currently in use like multiple-input multiple-output (MIMO) simultaneously. We include some mathematical proofs and also give an academic example