1,721,019 research outputs found
DIFFERENTIAL AND VEHICLE COMPRISING SUCH DIFFERENTIAL
No full textA differential (12) comprises two magnetic gears (20, 30) each comprising an internal rotor (22, 32), an external rotor (24, 34), and a rotor of the ferromagnetic poles (26, 36) interposed between the internal rotor ( 22, 32) and the external rotor (24,34). The internal rotor (22, 32), the external rotor (24, 34) and the ferromagnetic pole rotor (26, 36) are coaxial and suitable to rotate about a gear axis (28, 38). The internal rotors (22, 32) are suitable to be connected to a drive (40), to be placed in rotation about the respective gear axis (26, 36) by the drive motor (40) itself. The external rotors (24, 34) are suitable to be connected to respective output semi-axes (25, 35) to place them in rotation or are connected to adjustment means (50) suitable to adjust their rotation speed. In the event that the external rotors (24, 34) are suitable to be connected to respective output semi-axes (25, 35) for placing them in rotation, the rotors of the ferromagnetic poles (26, 36) are connected to adjustment means (50) suitable to adjust the rotation speed of the rotors of the ferromagnetic poles (26, 36). In the event that the external rotors (24, 34) are connected to the adjustment means (50) suitable for adjusting their rotation speed, the rotors of the ferromagnetic poles are suitable to be connected to respective output semi-axes (25, 35) to place them in rotatio
Multi-objective optimisation of a magnetic gear for powertrain applications
Full text linkThis paper proposes the study of a magnetic gear by means of multi-objective optimisation. Magnetic gears are structures able to transfer motion between two or more mechanical axles with a given speed ratio. In this aspect they are analogous to a classical mechanical gear but they allow to transfer motion without contact between the moving parts. To replace a standard mechanical gear in an automotive powertrain, the design of a magnetic gear able to transfer the torque needed by the application is required. At the same time, beside the torque, the replacement of the mechanical gear should not alter the dynamic of the powertrain so that also mechanical parameters, as for instance the moment of inertia, must be considered in the design. To cope with these requirements, a multi-objective optimisation approach is proposed that maximises the transmitted torque per unit mass of the magnetic gear while minimising the moment of inertia of the moving parts. Due to the computational intensive evaluation of the magnetic performance, the optimisation is carried out by a deterministic optimisation algorithm coupled to a weighted sum approach of objectives. Results are discussed and compared with those of a commercial application
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
The Cell Method for Electrical Engineering and Multiphysics Problems
No full textThis book presents a numerical scheme for the solution of field problems governed by partial differential equations: the cell method. The technique lends itself naturally to the solution of multiphysics problems with several interacting phenomena. The Cell Method, based on a space-time tessellation, is intimately related to the work of Tonti and to his ideas of classification diagrams or, as they are nowadays called, Tonti diagrams: a graphical representation of the problem's equations made possible by a suitable selection of a space-time framework relating physical variables to each other. The main features of the cell method are presented and links with many other discrete numerical methods (finite integration techniques, finite difference time domain, finite volumes, mimetic finite differences, etc.) are discussed. After outlining the theoretical basis of the method, a set of physical problems which have been solved with the cell method is described. These single and multiphysics problems stem from the authors' research experience in the fields of electromagnetism, elasticity, thermo-elasticity and others. Finally, the implementation of the numerical technique is described in all its main components: space-time discretization, problem formulation, solution and representation of the resulting physical fields.
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
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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