1,720,955 research outputs found
Non-invasive Flexible Electromagnetic Sensor for Potassium Level Monitoring in Sweat
No full textIn this paper, a novel wearable and non-invasive potassium sensors based on a flexible electromagnetic filter is presented. The filter topology includes a tapered feed line loaded four supershaped double split ring resonators with gap parallel to the line. The Kapton dielectric substrates was taken into account for its flexibility, chemical and high temperature resistance, high threshold for wear and abrasion. The embedded resonators have a reduced footprint and they was designed in order to exhibit enhanced sensitivity close to the operating frequency of 3 GHz. Moreover, a parametric analysis was carried out with the aim to identify the shape and geometrical parameters ensuring the optimal sensing capabilities. A prototype of the designed flexible sensor was realized and preliminary laboratory tests was carried out by considering a collagen sensing layer. The obtained results highlight a lowering of the resonance peak as the potassium concentration increases
Quantum Based Particle Swarm Optimization for Equivalent Circuit Design of Terminal Antenna Impedance
Full text linkIn this paper, an improved quantum-behaved particle swarm optimization (QPSO) approach for modeling antenna impedance is illustrated. In the proposed study, the Enhanced Weighted Quantum Particles Swarm Optimization (EWQPSO) is introduced with the aim to achieve local convergence acting on a reduced number of free parameters. To verify the performance of the proposed EWQPSO, several tests involving Ipersphere, Alpine, De Jong, Zakharov, Salomon functions were carried out. The obtained results demonstrated that the convergence is achieved more quickly by the EWPSO than other optimization algorithms based on QPSO. A lumped element equivalent circuit was designed to model the terminal impedance of a broadband planar sinuous antenna in the frequency range from 1 GHz to 3 GHz. The developed EWQPSO algorithm is then used to recover all the parameters characterizing the equivalent circuit. The resulting circuit exhibited a good impedance fidelity over the whole frequency range
Supershaped Sinuous Antenna for UWB Radar Applications
No full textIn this paper, we propose a novel class of sinuous antennas based on the integration of both 2D superformula and the sinuous one. The study was carried out with the aim to investigate the effects of some design parameters on the antenna performance in terms of radiation properties and impedance matching in a wide frequency range. In fact, thanks to the proposed formula, it is possible to generate a wide range of antenna shapes in a simple and analytical way by changing a reduced number of parameters. The analysis was carried out in the frequency range from 1 GHz to 10 GHz and the illustrated preliminary results highlight that the proposed approach could be an useful and flexible tool to create sinuous-like antennas having unique radiation properties
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
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