1,720,990 research outputs found
A multicentre, randomized study of telmisartan versus carvedilol for prevention of atrial fibrillation recurrence in hypertensive patients. Galzerano D, Di Michele S,
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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
Electromagnetic performances of innovative lightweight shields to reduce radiated emissions from PCBs
No full textAn innovative shielding concept to reduce radiated emissions from components and tracks on printed-circuit boards is proposed. The new shield is made of a polycarbonate foil, which is coated by a thin film of nickel (only 50 nm in thickness) and by a 5-μm thick layer of tin, and successively thermoformed. The innovative characteristics of such a high-technology shield are the extremely light weight, the high thermoformability, good shielding performance against both far-field and near field sources, low production costs, low installation costs, minimum occupied volume. The mechanical, chemical, and electromagnetic performance of the new shield has been characterized experimentally. Different bonding solutions are tested in order to optimize the shielding performance of the screening cover installed on a conductive ground plan
An innovative shielding concept for EMI reduction
No full textThe design and realization of lightweight shields to reduce radiated emissions and electromagnetic interference (EMI) with sensitive electronic apparatus and systems is a challenge for electromagnetic compatibility (EMC) engineers.
Techniques that are currently used to improve the shielding performances of light materials such as plastics and composites are: the insertion of conducting meshes in the substrate [1, 2], the use of conducting additives and fillers prior to injection molding [3, 4] and the use of conducting coatings [5-8]. Among these techniques the use of conducting coatings allows the realization of lightweight shields.
The purpose of this paper is to demonstrate that thin coatings of conducting material, having thickness of a few micrometers, can provide good shielding performances in the radio-frequency range, up to a few gigahertz. The deposition of such coatings on polycarbonate foils leads to a new concept of lightweight thermoformable shield, which can be used to reduce EMI from and against printed circuit boards (PCBs) in electronic devices.
Applications of the innovative shielding concept are in different fields, when the requirement of light weight is a stringent constraint in the design of the shields. Examples are: portable electronic devices (PEDs) such as cellular phones, walk-talkies, portable radios and CDs, equipment to be used or installed onboard aircraft, on satellites, etc.
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
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