1,720,989 research outputs found
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
An Investigation of the Design and Development of a Multi Frequency Inductive Power Transfer System
No full textWith the current surge in the development and use of Electric Vehicles (EVs) due to increased environmental consciousness, methods to increase the driving range and improve the battery charging conditions of these vehicles have become important research areas. Inductive Power Transfer (IPT) is one of the solutions to the challenges currently faced by EV manufacturers and customers. IPT is a method that is used to transfer power over large air gaps and has proven to be efficient, reliable and convenient in the charging of electric vehicles and also for factory automation systems and charging of consumer devices such as mobile phones. In some cases, it necessary to have transmitter and receiver topologies having multiple coils especially in a three phase IPT highway system or a table top IPT system for charging many consumer devices or mobile phones at the same time. Multi coil topologies are also used in lumped charge pad topologies to enable better misalignment tolerances. In such cases it is necessary to mutually decouple these multiple coils to avoid interactions that could affect the efficiency of power transfer. The current state of the art systems offer solutions that lead to the decoupling of multiple coils by their relative spatial position, and are hence limited. Multi coil systems operating at the same frequency also generate magnetic fields that add or cancel out each other, thereby changing the air gap magnetic field orientation depending on which coil is powered. A multi frequency IPT system developed in this thesis aims to provide a solution to the above challenges. A multi coil primary system with two coils carrying currents of different frequencies can be designed to transfer power independently without interactions between the two different frequency systems. This thesis develops this concept by first investigating the need for decoupling multi coil transmitter and receiver designs. Multi frequency IPT is then introduced and the design considerations are developed in order to achieve a frequency decoupled IPT system. Experimental results of the proposed multi frequency method using two transmitter coils are also presented. Finally, a comparison is provided between this proposed multi frequency method using two transmitter coils and another recently published method that amplifies the third harmonic along with the fundamental from the input inverter, thereby achieving multi frequency IPT using one transmitter coil.DC Systems and StorageElectrical Sustainable EnergyElectrical Engineering, Mathematics and Computer Scienc
Electromagnetic Evaluation and Optimization of a Combined Inductive Power Transfer and Inductive Healing Road
No full textElectrical vehicles (EVs) can be charged wirelessly with an inductive power transfer (IPT) system that uses a magnetic field to deliver power to the EV. Such a system could be embedded in the highway to charge EVs while they are driving. The magnetic field of the IPT system is created using coils that are exited with a high frequency current. Recent developments has created a low maintenance asphalt that can be healed by means of induction heating. Steel wool is added to the asphalt to make it suitable for induction heating, which is also done using coils that are exited with high frequency currents. This thesis will investigate the feasibility of a combined inductive healing asphalt (IHA) and IPT highway. The main goal will be to reduce the losses in the IHA for an efficient operation of the IPT system, while maintaining the possibility to heat the asphalt by means of induction heating when desired. Also a preliminary economical analysis to estimate the financial profit of a low maintenance road is performed. A detailed loss model for IPT systems is created that is used to describe the power transfer efficiency and predict the losses in the asphalt. Four concepts are suggested to obtain a feasible combination, which are (1) a sectioned road that separates the IPT and the IHA systems in the geometry, (2) IHA with anisotropic conductivity and permeability, (3) asphalt with dedicated heating elements and (4) asphalt with frequency dependent hysteresis losses. The loss models are verified using an experimental setup, which shows that the models created for concepts (1)-(3) provide an accurate description of the system. Based on the models and the experimental results it is concluded that the concepts (1) and (3) can provide a feasible combination of an IHA highway in combination with IPT systems. The design of such a highway would however need careful considerations with respect to the dimensioning of the systems and external sources might be needed to apply induction healing for some parts of the highway. The result of the preliminary economical analysis shows that the expected reduction in maintenance will be more than the additional implementation costs and therefore the concepts are also economically feasible.Electrical Engineering, Mathematics and Computer ScienceElectrical Sustainable Energ
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
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
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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