1,721,129 research outputs found
Modelagem, ajuste e implementação de um sistema de controle de tensão para o gerador de indução
Get PDFThe aim of this dissertation is the development of an induction generator voltage
control system, regardless of the machine load.
The method consists basically of using fixed capacitors, associated with TCR’s
(Thyristor Controlled Reactors), for voltage controlling.
A PI (proportional Integral) regulator has been implemented in the proposed
system of voltage control loop. The optimization of the regulator was made using the
Modulus Optimization Method (OM) and the obtained results have been satisfactory,
presenting stability and good dynamics.
The system was implemented in laboratory through a prototype that uses
a Induction Motor Used As Generator (IMAG) of 1,86 [kW] in 220 [V]. The proposed
control system is detailed in the dissertation. The results have been introduced and
discussed.O objetivo desta dissertação é o desenvolvimento de um sistema de controle de
tensão para o gerador de indução, independentemente da carga da máquina.
O método consiste basicamente de capacitores fixos associados a indutores
controlados a tiristores para o controle da tensão.
Um regulador tipo PI (proporcional Integral) foi implementado na malha do
controle de tensão do sistema proposto. A otimização do regulador foi feita
empregando-se o Método da Otimização pelo Módulo (OM), e os resultados obtidos
foram satisfatórios, apresentando estabilidade e boa dinâmica.
O sistema foi implementado em laboratório através de um protótipo que utiliza
um Motor de Indução usado Como Gerador de 1,86 [kW] em 220 [V]. O sistema de
controle proposto é detalhado na dissertação. Os resultados foram apresentados e
discutidos
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
Retratação: Karl Marx, um cidadão do mundo
Get PDFThe Editorial Team of Revista Katálysis hereby announces the formal publication of a Retraction for the extraction of the article:
BRAGA, Alexandre. Karl Marx, a citizen of the world. Rev. Katálysis. 2024, v 27, e98143. https://doi.org/10.1590/1982-0259.2024.e98143
After publication by Katálysis Magazine, the same publication was found in another magazine, carried out almost simultaneously, according to the data below.
BRAGA, Alexandre Francisco. Karl Marx, a citizen of the world. Revista de Ciências doEstado, Belo Horizonte, v. 9, n. 2, p. 1-12, 2024. DOI: 10.35699/2525-8036.2024.51039. Available at: https://periodicos.ufmg.br/index.php/revice/article/view/e51039.
Katálysis Journal's Editorial Policy states that original articles should be published if they have not been submitted to or are not being evaluated by another journal, which the author has not informed us of. This justifies a full retraction and the publication has already been removed from the Rev. Katálysis page on the UFSC Journals Portal.
Proff. Mailiz Garibotti LusaEditor-in-ChiefA Equipe Editorial da Revista Katálysis comunica a publicação formal de Retratação para extração do artigo:
BRAGA, Alexandre. Karl Marx, um cidadão do mundo. Rev. Katálysis. 2024, v 27, e98143. https://doi.org/10.1590/1982-0259.2024.e98143
Após a publicação pela Revista Katálysis, encontrou-se a mesma publicação em outra revista, realizada de forma quase simultânea, conforme dados abaixo.
BRAGA, Alexandre Francisco. Karl Marx, um cidadão do mundo. Revista de Ciências doEstado, Belo Horizonte, v. 9, n. 2, p. 1–12, 2024. DOI: 10.35699/2525-8036.2024.51039. Disponível em: https://periodicos.ufmg.br/index.php/revice/article/view/e51039.
A Revista Katálysis tem como diretriz em sua Política Editorial a publicação de artigos originais, que não tenham sido submetidos ou não estejam em processo de avaliação em outro periódico, o que não foi informado pelo autor. Justifica-se assim a retratação total e informa-se que a publicação já foi retirada da página da Rev. Katálysis no Portal de Periódicos da UFSC.
Profa. Mailiz Garibotti LusaEditora-Chef
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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