1,720,954 research outputs found
Adaptive-Based Accurate Rotor Initial Position Estimation in Synchronous Reluctance Motors
No full textAccurate estimation of initial rotor position is of importance in synchronous reluctance motor (SynRM) drives to gain maximum starting torque and to prevent the overcurrent fault and reverse rotation. This article presents an accurate algorithm, subsumed under the category of voltage pulse injection methods, to define the rotor initial position. In this method, first, the rotor initial sector (with a resolution of 30 electrical degrees) is estimated according to the peak currents acquired by the injection of the symmetrical pulses. Then, the data of an optimum switching vector are introduced to an adaptive-based algorithm to result in the lowest possible error. The efficacy of the proposed method is checked experimentally on a 0.5-hp SynRM drive system and the accuracy of the method is proven high against two other practical pulse-injection-based methods, i.e., conventional and iterative pulse injection-based methods. In addition, experimental results of the high-frequency square-wave method prove the higher accuracy and faster estimation time of the proposed method. The implementation of the proposed method is simple and straightforward. Furthermore, it is robust to the variations and uncertainties of the stator resistance
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
Efficiency Optimization of Induction Motor by Automatic Voltage Regulator of Synchronous Generator Based on Search-based Method
No full textThis article proposes a new method to optimize the efficiency of a 7.5 kW induction motor connected to a synchronous generator. The Synchronous generator is a part of an emergency power system supposed to provide power for the induction motor. In this proposed method, the efficiency of induction motor is optimized by the automatic voltage regulator of synchronous generator under different loads. The centerpiece of automatic voltage regulator is a DC/DC buck converter which feeds excitation winding. Due to improvement of induction motor efficiency, the cost of generation is significantly reduced. In the proposed method, a search-based method is utilized to adjust the output voltage of synchronous generator in order to find the maximum efficiency of induction motor. Furthermore, losses equations are presented which are applied in efficiency calculation. As a result of not using speed sensor, the motor equations arc used to estimate the motor slip in each step of search method. Results of the proposed method is presented to verify the method performance using MATLAB/Simulink
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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