1,721,031 research outputs found
A saturation model based on a simplified equivalent magnetic circuit for permanent magnet machines
No full textThis paper proposes an explicit mathematical model to describe the nonlinear behavior of the permanent magnet synchronous reluctance machine. Although different models for the synchronous reluctance machines are available, extending them to the case of the permanent magnet machine is not trivial due to the effect of the permanent magnets on the rib saturation. This work uses a simplified equivalent magnetic circuit to derive the structure of the proposed model. A nonlinear reluctance is introduced to model the rib saturation. It can be added to the existing model for the synchronous reluctance machine to take into account the effect of the permanent magnets. A simple fitting procedure based on the steepest descent method is proposed to estimate the parameters of the model
A Comparison between power splitting functions integrated in a power sharing model
No full textThe recent global rise in energy costs coupled with the need to reduce atmospheric emissions is prompting more and more users to seek green and zero-emission power generation solutions such as photovoltaic plants (PV). The main issue related to the installation of a domestic photovoltaic system concerns the power distribution to the various users in the building where the PV is installed. This paper aims to provide three different algorithms suitable for a Power Sharing Model (PSM) in order to assign the shared power produced by the PV. For each algorithm, will be highlighted merits and drawbacks of the proposed solution, keeping in consideration that there are multiple valid solutions for implementing the model, each with different purposes. Next, a case study representing a building with typical users (three – phase and single – phase users) will be conducted, in which the three algorithms are tested within a Simulink model in order to analyze their behavior depending on the proposed scenario
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
Analysis of the possibile transport to the nucleus of the KGFR and its ligands at late steps of endocytosis.
No full textA new SUV conceived by stylistic design engineering (SDE)
No full textStylistic Design Engineering (SDE) is an engineered method developed for creating a structured way to realize Car Design Projects. SDE is composed by the following steps: (1) Stylistic Trends Analysis; (2) Sketches; (3) 2D CAD Drawings; (4) 3D CAD Models; (5) Rendering; (6) Solid Stylistic Model (defined also styling maquettes). In the present paper, SDE is applied to a new SUV, in particular to a new possibility of launching a new FIAT Campagnola, an off-roader that was very successful in the 1950s -1970s. This project deals with the exernal redesign of Fiat Campagnola. It has been carried out using various design technologies and methodologies that will be further explained in details, such as the Pininfarina method, the QFD (Quality Function Deployment) method, Benchmarking e Top Flop analysis. The work has been organized according to different phases. At first it has been studied the Fiat style, an essential step to understand better the features of the brand and also the main characteristics carried out during the decades. Later we carried on with the phase of the freehand sketches, being inspired by what was previously learned in every single step of study. This phase continued until a satisfactory form was found by analyzing and discarding the various proposals of the various types of style. Once the proposal was choosen, then the three-dimensional shape was obtained and on which it was possible to evaluate proportions and dimensions, also thanks to rendering software. All the analysis methodologies required for the quality of the project mentioned before have been used during all these phases
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
The triggering of starbursts in low-mass galaxies
Full text linkStrong bursts of star formation in galaxies may be triggered either by internal or external mechanisms. We study the distribution and kinematics of the H I gas in the outer regions of 18 nearby starburst dwarf galaxies that have accurate star formation histories from Hubble Space Telescope observations of resolved stellar populations. We find that starburst dwarfs show a variety of H I morphologies, ranging from heavily disturbed H I distributions with major asymmetries, long filaments, and/or H I-stellar offsets to lopsided H I distributions with minor asymmetries. We quantify the outer H I asymmetry for both our sample and a control sample of typical dwarf irregulars. Starburst dwarfs have more asymmetric outer H I morphologies than typical irregulars, suggesting that some external mechanism triggered the starburst. Moreover, galaxies hosting an old burst (≳100 Myr) have more symmetric H I morphologies than galaxies hosting a young one (≲100 Myr), indicating that the former ones probably had enough time to regularize their outer H I distribution since the onset of the burst. We also investigate the nearby environment of these starburst dwarfs and find that most of them (˜80 per cent) have at least one potential perturber at a projected distance ≲200 kpc. Our results suggest that the starburst is triggered either by past interactions/mergers between gas-rich dwarfs or by direct gas infall from the intergalactic medium
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
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