1,721,505 research outputs found
Diseño de un prototipo semi automatizado para la cocción de huevos de gallina a escala industrial
Full text linkLa finalidad fue presentar una propuesta de automatización para la mejora del proceso de cocción de los huevos de gallina, el cual es un problema que aqueja a proveedores que abastecen a programas sociales como Qali Warma y comedores
populares. El objetivo del presente proyecto fue diseñar un prototipo Semi automatizado para la cocción de huevos de gallina a escala industrial. Se siguieron tres pasos: definir las partes y dimensiones en AutoCAD 2D y 3D, Seleccionar los componentes tanto en Hardware como en Software para la automatización compatibles con Arduino y simular el proceso en Codesys. Como resultados se obtuvo seis partes, como la caja contenedora de huevos, contenedor de cajas, soporte contenedor de cajas, la marmita de cocción, soporte general y caja de control. Se seleccionó la placa Arduino, termocupla, pantalla LCD 20x4, DF playermini, protoboard y altavoces. Mediante la simulación se mostró el diagrama de operaciones del proceso de cocción de forma gráfica y animada. En conclusión, el diseño y automatización del prototipo es una propuesta que busca mejorar el proceso de cocción de los huevos de gallina a través del monitoreo y control de variables como tiempo y temperatura
Uneven spatial distribution of surface EMG: what does it mean?
No full textThe aim of this work is to show how changes in surface electromyographic activity (sEMG) during a repetitive, non-constant force contraction can be detected and interpreted on the basis of the amplitude distribution provided by high-density sEMG techniques. Twelve healthy male subjects performed isometric shoulder elevations, repeating five times a force ramp profile up to 25 % of the maximal voluntary contraction (MVC). A 64-electrode matrix was used to detect sEMG from the trapezius muscle. The sEMG amplitude distribution was obtained for the force levels in the range 5-25 % MVC with steps of 5 % MVC. The effect of force level, subject, electrode position and ramp repetition on the sEMG amplitude distribution was tested. The sEMG amplitude was significantly smaller in the columns of the electrode grid over the tendons (repeated measures ANOVA, p < 0.01). The barycentre of the distribution of sEMG amplitude was subject-specific (Kruskal-Wallis test, p < 0.01), and shifted caudally with the increase of force levels and cranially with the repetition of the motor task (both p < 0.01, repeated measures ANOVA). The results are discussed in terms of motor unit recruitment in different muscle sub-portions. It is concluded that the sEMG amplitude distribution obtained by multichannel techniques provides useful information in the study of muscle activity, and that changes in the spatial distribution of the recruited motor units during a force varying isometric contraction might partially explain the variability observed in the activation pattern of the upper trapezius muscl
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Simple and effective titrimetric procedure for the determination of sulfide and cysteine in leather industry effluents
No full textMyoelectric manifestations of fatigue are localized in the human medial gastrocnemius muscle
No full textThe use of the Nitrite Ion in the Chromatographic Determination of Large Amounts of Hypochlorite Ion and Traces of Chlorite and Chlorate Ions.
No full textAn ion chromatographic procedure was developed for the one-run determination of ClO-, ClO2- and ClO3- present at very different concentration levels in the same sample. The method is based on the quantitative and fast reduction of HClO in slightly acidic medium by added sodium nitrite, followed by the ion chromatographic determination of ClO2-, ClO3- and the generated NO3-. The possibility of amperometric titration of the 'free chlorine' with a standard solution of NaNO2 was also ascertained. The performance characteristics of the analysis were defined
Miele buono e nutriente! Seguiamolo dal fiore... al vasetto
No full textNettare e melata sono i prodotti di base che le api raccolgono per elaborare
il miele, nutrimento dell’alveare che l’uomo ha saputo trarre anche per sé
dal lavoro instancabile di questi Imenotteri. Ci sono tanti mieli diversi, tutti unici
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
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