Combined photo- and electroreflectance of multijunction solar cells enabled by subcell electric coupling

Electric coupling between subcells of a monolithically grown multijunction solar cell in short circuit allows their simultaneous and independent characterization by means of photo- and electroreflectance. The photovoltage generated by selective absorption of the pump beam in a given subcell during photoreflectance measurements results in reverse biasing the complementary subunits at the modulation frequency set on the pump illumination. Such voltage bias modulation acts then as external perturbation on the complementary subcells. The spectral separation of the different subcell absorption ranges permits the probe beam to record in a single spectrum the response of the complete device as a combination of photo- and electroreflectance, thereby providing access for diagnosis of subcells on an individual basis. This form of modulation spectroscopy is demonstrated on a GaInP/GaAs tandem solar cell.Comment: 5 pages, 4 figures. This article has been accepted by Appl. Phys. Lett. After it is published, it will be found at https://doi.org/10.1063/1.506260

Meaningful Digital Storytelling Practices for Learning, Reflection, Creativity and Social Participation

Digital storytelling (DS) can be considered as a media genre itself. It consists in creating short stories (usually in the form of video between 2 and 5 minutes long) told in first person and using a wide range of digital media and modes of expression. More than twenty years after Joe Lambert and Dana Atchley created them in the US, the practice of DS continues to expand worldwide and in a variety of contexts

Aplicació d'estratègies didàctiques de comprensió lectora en textos electrònics narratius

Este artículo expone una investigación de tipo cuasiexperimental que ha tenido como objetivo comprobar la posible relación entre la aplicación de estrategias de comprensión lectora en un texto electrónico narrativo creado con el software Lektor, y una mayor puntuación en los resultados de una prueba de comprensión lectora posterior a la lectura del texto. Las estrategias seleccionadas fueron la activación de conocimientos previos mediante una introducción de contenido previa al texto, la inserción de anotaciones textuales en palabras clave del texto para favorecer la generación de inferencias, y el uso de un bloc de notas para potenciar el recuerdo de éstas. Los participantes en la muestra de la investigación fueron cuatro grupos-clase de tercero de ESO (n=107), divididos en tres grupos: grupo de control, inferencial e inferencial-bloc de notas. Los resultados indican que existe una relación significativa entre la inserción de las dos primeras estrategias y una mayor puntuación en las preguntas de respuesta de inferencial. ____________________________________________________________________________________________________________________________________________________________________________________________________________ Cet article expose une recherche de type quasiexpérimental qui a eu comme objectif la vérification d’une relation possible entre l’application de stratégies de compréhension lectrice dans un texte électronique narratif créé avec le logiciel Lektor et une plus grande ponctuation des résultats d’un test de compréhension lectrice postérieure à la lecture du texte. Les stratégies sélectionnées ont été l’activation de connaissances préalables au moyen d’une introduction de contenu préalable au texte, l’insertion d’annotations textuelles dans des motsclés du texte pour favoriser la génération d’inférences, et l’usage d’un bloc de notes pour renforcer le souvenir de ces dernières. Les participants à l’échantillon de la recherche ont été quatre groupesclasse de 3e de l’éducation secondaire (14-15 ans) (n = 107), divisés en trois groupes : un groupe de contrôle, un groupe d’inférence et un groupe d’inférence-bloc de notes. Les résultats indiquent qu’il existe une relation significative entre l’insertion des deux premières stratégies et une plus grande ponctuation des questions de réponse d’inférence.This article presents a quasi-experimental research project which studied the links between the application of reading comprehension strategies to an electronic narrative text created by Lektor software, and an improvement in the results of a reading comprehension test carried out immediately afterwards. The selected strategies included the activation of previous knowledge by introducing the content before reading the text; the insertion of footnotes at key words in the text to encourage the making of inferences; and the use of a notebook to facilitate the recall of inferences. Four class groups (107 students) from the third year of secondary school (aged 14- 15) participated in the study sample. Pupils were divided into three groups: control, inferential and inferentialnotebook. Results indicate that there is a significant link between the use of the first two strategies and an improved score in inferential reading comprehension tests.Este artículo expone una investigación de tipo cuasiexperimental que ha tenido como objetivo comprobar la posible relación entre la aplicación de estrategias de comprensión lectora en un texto electrónico narrativo creado con el software Lektor, y una mayor puntuación en los resultados de una prueba de comprensión lectora posterior a la lectura del texto. Las estrategias seleccionadas fueron la activación de conocimientos previos mediante una introducción de contenido previa al texto, la inserción de anotaciones textuales en palabras clave del texto para favorecer la generación de inferencias, y el uso de un bloc de notas para potenciar el recuerdo de éstas. Los participantes en la muestra de la investigación fueron cuatro grupos-clase de tercero de ESO (n=107), divididos en tres grupos: grupo de control, inferencial e inferencial-bloc de notas. Los resultados indican que existe una relación significativa entre la inserción de las dos primeras estrategias y una mayor puntuación en las preguntas de respuesta de inferencial

Big Data on Decision Making in Energetic Management of Copper Mining

Indexado en: Web of Science; Scopus.It is proposed an analysis of the related variables with the energetic consumption in the process of concentrate of copper; specifically ball mills and SAG. The methodology considers the analysis of great volumes of data, which allows to identify the variables of interest (tonnage, temperature and power) to reach to an improvement plan in the energetic efficiency. The correct processing of the great volumen of data, previous imputation to the null data, not informed and out of range, coming from the milling process of copper, a decision support systems integrated, it allows to obtain clear and on line information for the decision making. As results it is establish that exist correlation between the energetic consumption of the Ball and SAG Mills, regarding the East, West temperature and winding. Nevertheless, it is not observed correlation between the energetic consumption of the Ball Mills and the SAG Mills, regarding to the tonnages of feed of SAG Mill. In consequence, From the experimental design, a similarity of behavior between two groups of different mills was determined in lines process. In addition, it was determined that there is a difference in energy consumption between the mills of the same group. This approach modifies the method presented in [1].(a)http://www.univagora.ro/jour/index.php/ijccc/article/view/2784/106

Intelligent Packaging Systems: Sensors and Nanosensors to Monitor Food Quality and Safety

Indexación: Web of Science y Scopus.The application of nanotechnology in different areas of food packaging is an emerging field that will grow rapidly in the coming years. Advances in food safety have yielded promising results leading to the development of intelligent packaging (IP). By these containers, it is possible to monitor and provide information of the condition of food, packaging, or the environment. This article describes the role of the different concepts of intelligent packaging. It is possible that this new technology could reach enhancing food safety, improving pathogen detection time, and controlling the quality of food and packaging throughout the supply chain.https://www.hindawi.com/journals/js/2016/4046061/cta

Crisis alimentaria y su impacto en los niveles de pobreza de los países menos desarrollados

Lliçó inaugural del curs 2008-2009

La búsqueda de los orígenes en la adopción

This article presents a review of the concepts and study of adopted people's search for their origins. It traces a general outline for advising the people involved, and calls for the creation of post-adoption services, underlining the need for new legal regulations to enable adults who were adopted as children to discover their origins.En este articulo se presenta una revisión de los conceptos e investigaciones en torno a la búsqueda de los orígenes en la adopción. Se indican las líneas generales para poder realizar un asesoramiento a las personas implicadas. Se sugiere la creación de servicios postadopción y la necesidad de una nueva regulación legal para que prevalezca el derecho de las personas adoptadas adultas que deseen conocer sus orígenes

Correlation functions in the non-relativistic AdS/CFT correspondence

We study the correlation functions of scalar operators in the theory defined as the holographic dual of the Schroedinger background with dynamical exponent z=2 at zero temperature and zero chemical potential. We offer a closed expression of the correlation functions at tree level in terms of Fourier transforms of the corresponding n-point functions computed from pure AdS in the lightcone frame. At the loop level this mapping does not hold and one has to use the full Schroedinger background, after proper regularization. We explicitly compute the 3-point function comparing it with the specific 3-point function of the non-relativistic theory of cold atoms at unitarity. We find agreement of both 3-point functions, including the part not fixed by the symmetry, up to an overall normalization constant.Comment: 32 pages, 7 figures; v2: typos corrected, references added and additional discussion about the case of compact number-direction, includes new appendix with the computations of the 2 and 3 point function for the compact number-direction case. The general results remain the same. Version published in Phys.Rev.