1,721,012 research outputs found
Moisture measurement system for brick kiln
No full textThe purpose of this work is to realize a low-cost sensor for measuring the clay moisture, by metering the reflection at two different laser wavelengths, 1,300 and 1,500 nm. This kind of reflection measurement is well known: the standard implementation employs a lamp and a series of optical filters, selected sequentially by a mechanical handling system. In order to simplify the system, the proposed sensors employ two laser-diode sources and a single photodetector, without moving parts or optical filter. The measurement of different reflections is made working in time division multiplexing. Custom low-noise electronics allows rejecting ambient light disturbances and digital processing makes the system independent of the clay distance
Thermal sensor for fire localization
No full textFire prevention is one of the main topics regarding home safety of old-renovated and newly built buildings. While it is possible to install modern fire extinguisher system in new houses, during house building, to prevent and stop fires in the old ones, it is easier and less expensive to place some portable automated system to perform this task. To create an automated system, a sensor to localize a fire in a closed environment such as a room is necessary. The sensor has to provide the coordinates of the fire onset to an automated arm with a fire extinguisher. The sensor is based upon a couple of matrix of thermopiles; as a result, their images are opportunely elaborated and they give the dimensional position of the fire onset where the fire extinguisher will direct its beam. This system is a very promising system in closed environment, due to its cost and relative simplicity of installation in order to better prevent fire propagation
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
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
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe 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
Full text linkWe 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
Chemical sensing investigations on Zn–In2O3 nanowires
No full textThis work illustrates the sensing behavior of Zn-doped and undoped In2O3 nanowires toward pollutant gases. An enhanced sensor response to reducing gases (e.g. H-2, CO and ethanol) from indium zinc oxide (IZO) nanowires in comparison to In2O3 nanowires is obtained. Zn-doping increases the oxygen vacancies which enhance the oxygen ion adsorption on the nanowire surface. These adsorbed oxygen ions enhance the sensor responses for CO (from 4.5 to 21.5 for 400 ppm), H-2 (from 4.7 to 32.5 for 4000 ppm) and ethanol (from 3.5 to 60 for 100 ppm). On the other hand, the sensor response for NO2 reduces (from 17.5 to 6.5 for 1 ppm NO2) after Zn-doping. Opposing temperature dependent sensor response from IZO nanowires toward NO2 is observed at higher temperature (above 300 degrees C). This is attributed to the downshift in the Fermi level of IZO due to dissociative NO2 interaction at higher working temperatures which produces oxygen ions that diffuse into the nanowire. (C) 2012 Elsevier B.V. All rights reserved
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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