1,721,004 research outputs found
Choosing shapes and sizes of LEGO bricks with penetrating PEC structures
No full textWe perform an optimization of the shape and the size of domains within the framework of linear embedding via Green’s operators (LEGO) for various PEC objects analysed using this approach. These domains are also known as ”bricks” because of their most common cuboidal shape. The objects are enclosed within multiple LEGO bricks by applying a domain decomposition method and to ensure interaction between inside and outside of the bricks we have used equivalence principles. To enhance this approach, we allow the PEC objects to penetrate the brick boundaries. We adjust the shape and the size of the bricks to increase computational efficiency, compress the system, and make recalculations of the problem convenient for modest changes of the PEC object
Computational Aspects of Simulating a Wind Turbine Blade Deflection Sensing System
Get PDFRecently introduced wind turbine blade deflection sensing system using ultrawideband technology is described. Challenges of simulating microwave propagation along the blade using the finite-difference time-domain method are outlined. Two straightforward techniques that have been used to speed up the finite-difference time-domain (FDTD) simulation are presented: load balancing of parallel processes and the moving frame technique. In addition, a simple method to reduce the numerical dispersion error of the FDTD method is presented.</p
Recursive algorithms for computational electromagnetics
No full textEfficient and fast recursive algorithms for both the spectral-domain and the space-domain solutions of the electromagnetic scattering problems have been developed. These algorithms have less than O(N\sp3) computational complexities and less than O(N\sp2) memory requirements for arbitrary geometries of scatterers clustered together. Although the algorithms are discussed as they are applied to the electromagnetic scattering problems, their domains of applicability can be extended to other types of electromagnetic problems (e.g., guidance, resonance, and radiation) and also to other types of field and wave equations (e.g., acoustic, elastic, and Schrodinger).The applications of these algorithms to the conducting strip and patch geometries have been demonstrated. Dielectric and magnetic materials can also be incorporated into conductor geometries. Due to the availability of the spectral Green's function, spectral-domain algorithms can efficiently handle geometries consisting of an arbitrary number of infinitely thin, conducting strips and flat patches of any shape embedded in arbitrarily layered media, in which the layers are infinitely large in the transverse directions. On the other hand, the space-domain algorithms presented in this dissertation are the recursive T-matrix algorithms, and due to the nature of the T-matrix formulations, they can easily handle geometries consisting of conductors, dielectrics and magnetic materials of finite size. Therefore, various problems defined in broad classes of geometries can be solved with these spectral-domain and space-domain algorithms.A recursive implementation of the method of moments is also presented. This algorithm is based on the principle of inversion of a general matrix by partitioning. Since it is a recursive algorithm, and since each recursion step requires O(N\sp2) operations, it can efficiently solve the problems in which one has to modify or perturb some parts of a main body whose solution is already known."When solving the electromagnetic scattering problem, these algorithms give the full-wave solution without having to make any approximations. Being computational algorithms, they are ""exact"" in the numerical sense. These algorithms also give the solution for all possible incident waves or ""right-hand sides"" at once, a property that is not shared by some other fast solution techniques such as the conjugate-gradient method. Furthermore, as opposed to some other formulation schemes such as the finite-element method, these algorithms naturally incorporate the radiation condition at infinity; therefore, they can handle geometries in unbounded media."Made available in DSpace on 2011-05-07T11:52:38Z (GMT). No. of bitstreams: 2
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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
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