1,720,972 research outputs found
Programación para el control automatizado de un sistema de síntesis de películas delgadas por AACVD
Get PDFUn sistema de control es un arreglo de componentes físicos, electrónicos (Analógico o Digitales) etc., para: gobernar, dirigir o regularse a sí mismo o a otro sistema. Manteniendo un valor deseado dentro de un margen de error. El objetivo de gobernar un sistema, es adquirir los valores de entrada, procesarlos y establecer las salidas, con la mínima o nula intervención del usuario. Es por ello, que la implementación de sistemas automatizados en equipos o técnicas de síntesis de materiales nanoestructurados, es beneficioso. Lo anterior porque puede mejorar la reproducibilidad de los resultados, de la misma manera que la industria en manufactura explota estos recursos tecnológicos
PROTOTIPO DE UNIDAD METEOROLÓGICA INTEGRAL PARA MONITOREO REMOTO Y ANÁLISIS DE SISTEMAS DE ENERGÍAS RENOVABLES
No full textEl propósito de este proyecto es realizar una estación meteorológica con
el fin de evaluar el recurso eólico en la región, ya que se tienen datos de
estudio en regiones vecinas colindantes con otras entidades y no se han hecho
estudios serios en esta región de la entidad. Un agregado es relacionar el
recurso eólico con evaluación de energía generada con un aerogenerador.
Para lograr esto se procedió a implementar un sistema que cumpliera con la
confiabilidad de la toma de datos así como la suficiente robustez para
comunicarlo inalámbricamente a distancia, utilizando los dispositivos más
populares en el mercado para que el sistema pueda ser reproducible por
cualquier persona. Para llevar a cabo el trabajo se escogió el microcontrolador ARDUINO por ser
uno de los más populares en el mundo, por ser fácil de programar y tiene
muchas aplicaciones.
Para el enlace de los dispositivos se utilizaron ZIGBEES que tienen mucho
rango de operación, ya que la estaciones que existen comercialmente, por lo
regular solo cubren unos 100 m. con este dispositivo se pretende cubrir al
menos 400m.
Para ser representados los datos en la pantalla de la computadora se utilizó la
plataforma LABVIEW en su versión 2012, que integra la función datalogger o
bitácora, registrando la información en un archivo de texto (.txt), para su
posterior análisis.
Los dispositivos fueron proporcionados por CIMAV, para la realización del
proyecto, esta torre meteorológica ha sido utilizada estudiantes de la
Universidad Tecnológica de Nuevo Laredo en su materias de Estaciones
meteorológicas y Diseño de proyectos de turbo energía en la colección de
datos eólicos para el estudio de vientos.The purpose of this project is to make a weather station in order to
evaluate the wind resource in the region, since the study data are
bordering neighboring regions and not others have made serious
studies in this region of the state. An aggregate is related to the
wind resource evaluation with a wind energy generated. To achieve this, we proceeded to implement a system, that meets
the reliability of data collection and robust enough to communicate
wirelessly at a distance, using the most popular devices on the
market to enable the reader to repeat the procedure.
To carry out the work, ARDUINO microcontroller was chosen as
one of the most popular in the world, being easy to program and
has many applications.
For connecting devices are used ZIGBEES which have much
operating range , since the stations are usually cover only about
100 m. with this device is intended to cover at least 400 m .
Data to be represented in the computer screen, LABVIEW platform
was used in the version 2012, so how to manipulate the data to be
recorded in a text file.
The devices were provided by CIMAV, for the realization of the
project, this meteorological tower has been used too by students in
Technological University of Nuevo Laredo in subjects “Weather Stations” and “Design of turbo power projects” taking wind data
collection for the study of winds
Diseño para un sistema de deposito de material AACVD
Get PDFDefinimos el siguiente sistema como un método práctico enfocado al depósito de material AACVD, por medio de un barrido se obtiene una película a base de un sustrato en el que se plantea extraer partículas de hidrógeno, pero es necesario organizar bien el sistema para que su funcionamiento sea más práctico, por lo que se necesita ensamblarlo. Para ensamblar el sistema se va a requerir el modelado y la impresión 3D de piezas que faciliten el ensamble de la estructura del sistema
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe 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
Variations on the Author
Get PDF“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
Appropriate Similarity Measures for Author Cocitation Analysis
Get PDFWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Dispelling the Myths Behind First-author Citation Counts
Get PDFWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
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