1,721,386 research outputs found
On the second non-singular stress term of the V-notch solution: a new engineering solution
No full textThe non-singular stress terms are expressed by means complex eigenvalues and their corresponding complex coefficients for a number of sharp V-notches with varying notch opening angles. According to the literature the complex part of the solution introduces in the stress field equations an oscillatory function depending also on the logarithm of the radial distance from the notch tip. The intensity of the non-singular term depends on two parameters contrary to the conventional representation of the singular term the intensity of which is expressed by the notch stress intensity factor (NSIF). The aim of this paper is to investigate whether the stress field and the strain energy density can be described with sufficient accuracy by the real part of the Williams' solution, neglecting the complex part of the eigenvalue and the corresponding complex coefficient. This engineering proposal strongly simplifies the problem allowing to define a real, unique, non-singular NSIF (Hns) which governs the intensity of the non-singular part of the stress field
Spatial bloom filter in named data networking: a memory efficient solution
No full textAmong the possible future Internet architectures, Information Centric Networking (ICN) is the most promising one and researchers working on the Named Data Networking (NDN) project are putting efforts towards its deployment in a real scenario. To properly handle content names, the different components of an NDN network need efficient and scalable data structures. In this paper, we propose a new data structure to support the NDN forwarding procedure by replacing the current Forwarding Information Base (FIB): the Spatial Bloom Filter (SBF), a probabilistic data structure that guarantees fast lookup and efficient memory consumption. Through a set of simulations run to compare the performance of FIB and SBF, we found that the latter uses less than 5 KB of data to handle 106 queried interests, with a (negligible) probability 10-4 of false positive events. Conversely, the FIB requires up to 2.5 GB of data in disadvantageous cases, e.g. when interests are composed of a considerable number of components
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
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
Microstructure, distortion and residual stress investigation in a bio-inspired welding pattern
Full text linkIn Nature, when two surfaces are bonded, the joining interface usually follows a structurally optimized non-linear pattern, like cranial sutures. This distinctive characteristic of Nature could be imitated when joining thin plates by laser welding using a 'zigzag' path. It is expected that both welding stress and strain will develop in a different way as compared to the conventional butt-welding straight path due to a different heat flow and stiffness the weld bead undergoes during the welding process. To assess the resulting residual stress and distortion, as a function of the laser welding path, experimental investigations were carried out by X-ray diffraction technique and Coordinate Measurement Machine (CMM Hybrid), respectively. Results showed that the studied bio-inspired welding pattern can effectively alter both residual stresses and distortions. The outcome of this study unveils the potential of such a welding strategy to reduce the magnitude of detrimental tensile residual stress, opening new avenues to the development of more structurally efficient weldments as compared to standard linear welding
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