Los estudiantes de ciencias, ¿pueden reconocer los argumentos lógicos involucrados en una demostración?

En toda demostración matemática, se utilizan argumentos lógicos correctos; saber reconocerlos y aplicarlos es una condición necesaria para comprender algunos de los pasos clave en las demostraciones. Pero ¿puede un estudiante identificar claramente los argumentos que han sido utilizados en una demostración? Y si los reconoce ¿puede decir cómo se utilizaron? El objetivo de este trabajo es explorar si estudiantes de Matemáticas y Computación que cuentan con experiencia en cursos universitarios, de maestría e incluso de doctorado, son capaces de identificar los argumentos usados en una demostración.In every mathematical proof logically correct arguments are used; it is a necessary condition to find out them, and also to recognize how they are applied, for understanding some of the key steps in the demonstrations. But can a student clearly identify the arguments used in a demonstration? And if he recognizes them, is he able to explain how they were used? The aim of this paper is to explore if mathematics' and computer science's students -who have met demonstrations at their university, master or even doctoral courses- can successfully identify and explain the arguments within a demonstration

Personal UV Exposure for Different Outdoor Sports

Exposure to ultraviolet (UV) radiation is the major environmental risk factor in the development of skin cancers and it occurs mainly during outdoor activities. The purpose of this study is to quantify the UV exposure suffered by amateur athletes (tennis players, hikers and runners) in their training schedules. The study on tennis player exposure took place at a tennis club in Valencia during the month of June 2011. With respect to the hiking group, the hikes studied took place in several mountainous areas of Spain and France from June to August 2011. Finally, the exposure suffered by ten runners, while participating in a running circuit in the province of Valencia, from March to November 2011, was studied. The athletes were monitored using personal dosimeters (VioSpor), with the tennis players and runners wearing them on the wrist, and the hikers on the shoulder. The median daily personal UV exposure for the hikers was 8.1 Standard Erythema Dose (SED), and for the tennis players 7.5 SED, per day of training. The runners received a median of 14.6 SED while participating in the running circuit, and about 2 SED per competition day. Median daily UV exposure of the hikers and tennis players exceeded 5 SED, which means that, in the case of non sun-adapted skin type III and the non-use of sun protection, erythema may be induced in these subjects. However, the exposure suffered by the runners did not exceed the maximum personal exposure of 5 SED. Accordingly, it is necessary to encourage the use of high protection sunscreens and protective clothing, and to avoid UV exposure in the hottest part of the day.This research was supported by the Spanish Ministry of Education and Science as part of research project CGL2010-15931 and the Generalitat Valenciana as part of project PROMETEO/2010/064.Serrano Jareño, MA.; Cañada, J.; Moreno, J.; Gurrea Ysasi, G. 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Dermatology, 217(1), 38-44. doi:10.1159/000121473Downs, N., Parisi, A., & Schouten, P. (2011). Basal and squamous cell carcinoma risks for golfers: An assessment of the influence of tee time for latitudes in the Northern and Southern hemispheres. Journal of Photochemistry and Photobiology B: Biology, 105(1), 98-105. doi:10.1016/j.jphotobiol.2011.07.007Moehrle, M., Korn, M., & Garbe, C. (2000). Bacillus subtilis spore film dosimeters in personal dosimetry for occupational solar ultraviolet exposure. International Archives of Occupational and Environmental Health, 73(8), 575-580. doi:10.1007/s004200000183Rigel, E. G., Lebwohl, M. G., Rigel, A. C., & Rigel, D. S. (2003). Ultraviolet Radiation in Alpine Skiing. Archives of Dermatology, 139(1). doi:10.1001/archderm.139.1.60Siani, A. M., Casale, G. R., Diémoz, H., Agnesod, G., Kimlin, M. G., Lang, C. A., & Colosimo, A. (2008). Personal UV exposure in high albedo alpine sites. 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Multi-Gbps HTTP traffic analysis in commodity hardware based on local knowledge of TCP streams

In this paper we propose and implement novel techniques for performance evaluation of web traffic (response time, response code, etc.), with no reassembly of the underlying TCP connection, which severely restricts the traffic analysis throughput. Furthermore, our proposed software for HTTP traffic analysis runs in standard hardware, which is very cost-effective. Besides, we present sub-TCP connection load balancing techniques that significantly increase throughput at the expense of losing very few HTTP transactions. Such techniques provide performance evaluation statistics which are indistinguishable from the single-threaded alternative with full TCP connection reassembly. © 2017 Elsevier B.V

Adquisición De Datos De Magnitudes En Un Sistema Oleohidráulico Para Su Control Y Monitoreo En Un Laboratorio Remoto De Instrumentación Virtual De Código Abierto

The present research analyzes the state of the art of remote laboratories and their use in teaching and industry. In addition, the aim of this study is to develop a test bench to control and maintain, in optimal conditions, the operating parameters of a hydraulic oil system through an open source virtual platform. This equipment will analyze the behavior of an external gear pump which will enable us to make comparisons of mathematical models to predict the flow rate and compare it with that obtained in real time through the test bench. The analysis starts with a theoretical revision that is used for defining the variables to be controlled in the test bench. It is also used to propose a methodology that allows reaching the objectives raised

Determinación del comportamiento de velocidad de sedimentación de micropartículas frente a cambios del potencial de hidrógeno del electrolito en que se suspenden

79 p.El objetivo de este trabajo es determinar y analizar el comportamiento de la velocidad de sedimentación terminal de micropartículas de un tamaño medio de 250 nm, las cuales están suspendidas en agua, ante cambios en el potencial iónico de la suspensión, esto se realizó añadiendo nitrato de potasio (KNO3). Cabe mencionar que esta memoria fue realizada en base a datos de carácter secundario. En el trabajo se describe la modelación matemática clásica de los procesos de sedimentación, se estudia además las fuerzas de interacción electroquímicas entre partículas, así como también, se describe la medición de estas. Tras lo cual se describe detalladamente el sistema de partículas empleado, preparación de las suspensiones, la metodología experimental utilizada y los resultados alcanzados, en este caso de velocidad de sedimentación del sistema de partículas. Los resultados obtenidos en esta memoria se analizan y discuten, en este proceso, se desprendió cuán importante son las fuerzas iónicas de la suspensión, las que influyen de manera significativa en la magnitud de las fuerzas de interacción electroquímicas y junto con ello en la variación de la velocidad de sedimentación

Food-induced IgA Vasculitis (Henoch-Schönlein Purpura)

Immunoglobulin A (IgA) vasculitis is a rare entity in adults. It can be triggered by allergens such as drugs, food, or insect bites. We present a case of an adult male with a cutaneous IgA vasculitis of palpable purpura after eating canned sardines

Evaluación de 3 bioles a 3 dosis de aplicación para el enraizamiento de estacas en 2 especies de caricaceas babaco (carica pentagona) y jigacho (carica stipulata) en la parroquia eloy alfaro, cantón latacunga

El Babaco (Carica pentagona) pertenece a la especie pentagona de la familia Caricaceae, es un hibrido natural de origen Ecuatoriano posiblemente de la provincia de Loja, resultado del cruce entre Carica pubescens (Chihualcán, papayuelo o chamburo) y Carica stipulata (Toronche, o Jigacho). Este fruto tiene gran aceptación en el mercado por su aroma y sabor exclusivo por lo que es consumido tanto en fresco como procesado en: jugos, mermeladas, conservas, licores, helados, ensaladas, yogur, etc

Evaluación de 3 bioles a 3 dosis de aplicación para el enraizamiento de estacas en 2 especies de caricaceas babaco (carica pentagona) y jigacho (carica stipulata) en la parroquia Eloy Alfaro, cantón Latacunga.

La presente investigación se realizó en Ecuador, Provincia: Cotopaxi, Ciudad: Latacunga, Parroquia: Juan Montalvo, Altura: 2808 msnm, Longitud: W 78° 30', Latitud: S 0° 50', con el propósito de determinar, el mejor biol y dosis de aplicación que influya directamente para el enraizamiento de estacas en dos especies de Caricáceas, Babaco (Carica pentagona) y Jigacho (Carica stipulata). Los factores en estudio fueron tres fuentes de Biol (Rumen Bovino, Equino y Cobayo) y se aplico a tres Dosis de concentración al (25%, 50% y 75%). Se utilizo un arreglo factorial de 3 * 3 + 1 implementado en un DBCA con tres repeticiones. Para evaluar estadísticamente los datos que se obtuvieron en el ensayo se realizo el análisis de Varianza, y a las fuentes de variación que resultaron significativas se aplico la prueba de Túkey al 5% y la relación beneficio costo de los tratamientos. Las variables que se analizaron fueron: Longitud de raíz (cm) a los 30, 60 y 90 días, Número de raíces (número) a los 30, 60 y 90 días, Altura de brote (cm) a los 30, 60 y 90 días, Vigorosidad de brote (mm) a los 30, 60 y 90 días, Número de brotes (#) a los 30, 60 y 90 días, Precocidad (#) a los 60 días, Mortalidad (#) a los 90 días Durante la etapa de enraizamiento de Babaco (Carica pentagona), el biol de bovino cuyo contenido nutricional fue superior en cuanto a materia orgánica, macro y micro elementos así como en fitorreguladores, en comparación al resto de bioles influyó independientemente del tipo de dosificación aplicada, sobre la variable longitud radicular a los 60 días y 90 días alcanzando un promedio de 9.78 cm y 14.04 cm.de longitud radicular respectivamente..

Natural fibers as an alternative of reinforcement in composite materials. a review.

 Actualmente, existe la necesidad en todo el mundo, de crear nuevos materiales que sean amigables con el medio ambiente, para ser reemplazados por aquellos en donde la naturaleza requiere de tiempos de descomposición elevados.  En este contexto, las fibras naturales se presentan como una alternativa de material para el consumo en la fabricación de partes industriales, principalmente por su bajo costo, menor peso y un consumo de energía inferior durante la fase producción, frente a las fibras sintéticas.  Por tanto, en el siguiente documento se presenta una revisión, sobre las propiedades más relevantes de las fibras naturales para utilizadas como refuerzo en materiales compuestos. Se destaca inicialmente la estructura y clasificación de las fibras lignocelulosicas, luego las principales propiedades que se pueden determinar, posteriormente se concentra el estudio en las propiedades mecánicas, térmicas y morfológicas, plasmando los resultados obtenidos por diversos autores alrededor del mundo. Finalmente se hace una discusión sobre los resultados y las implicaciones de los mismos en la selección de la matriz polimérica y el proceso de fabricación de materiales compuestos. Palabras clave: estabilidad térmica, materiales compuestos, resistencia mecánica, morfología.

One-handed keystroke biometric identification competition

Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works. J. V. Monaco, G. Perez, C. C. Tappert, P. Bours, S. Modal, S. Rajkumar, A. Morales, J. Fierrez, and J. Ortega-Garcia, "One-handed Keystroke Biometric Identification Competition", in International Conference on Biometrics, ICB 2015, 58-64This work presents the results of the One-handed Keystroke Biometric Identification Competition (OhKBIC), an official competition of the 8th IAPR International Conference on Biometrics (ICB). A unique keystroke biometric dataset was collected that includes freely-typed long-text samples from 64 subjects. Samples were collected to simulate normal typing behavior and the severe handicap of only being able to type with one hand. Competition participants designed classification models trained on the normally-typed samples in an attempt to classify an unlabeled dataset that consists of normally-typed and one-handed samples. Participants competed against each other to obtain the highest classification accuracies and submitted classification results through an online system similar to Kaggle. The classification results and top performing strategies are described.The authors would like to acknowledge the support from the National Science Foundation under Grant No. 1241585. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the authors and do not necessarily reflect the views of the National Science Foundation or the US government