1,721,081 research outputs found
Design, fabrication and characterization of electromagnetic resonators for medical and environmental applications
Full text linkIn this Ph.D. thesis, the feasibility investigation, design, and characterization of different resonant structures optimized to improve the performance of microwave devices for environmental monitoring and medical applications, such as cancer therapy, have been illustrated. In particular:
▪ A metamaterial lens based on a split ring resonator (SRR) has been designed to improve the focusing of an external applicator for superficial hyperthermia tumour therapy. A prototype has been fabricated by using the standard printed board circuits (PCB) technology and then characterized. The experimental results suggest that a metamaterial based on SRR is a potentially effective option for external microwave applicators in the field of dermatology [1].
▪ An interstitial microwave applicator has been investigated for deep-seated tumours, a coaxial antenna working in the Industrial, Scientific, and Medical (ISM) frequency band at f=2.45 GHz. Several simulations have been performed to explore various configurations, impedance matching techniques, and radiating sections. The insertion of a metamaterial lens based on Closed Loop Resonator (CLR) around the radiating section of the applicator has been numerically investigated for a further improvement of the performance. Two prototypes of mini-invasive needle applicators have been constructed and characterized [2-5].
▪ Metamaterial lenses have been designed to improve the radiation performance of an antipodal Vivaldi antenna for wideband applications. Prototypes have been fabricated and characterized. The experimental results are in good agreement with simulations. The metalens allows the increase of the maximum gain, preserving the antenna bandwidth, and a more symmetrical radiation pattern [6-9].
▪ A microwave sensor based on a substrate integrated waveguide (SIW) technology has been designed and characterized for the detection of water contamination in the fuel. A suitable radiating slot placed on the top of the SIW applicator allows the interaction between the microwave electromagnetic field and the fuel contaminated. The sensor is low-cost, low profile and ensures a good sensitivity for constant and real-time monitoring [10]. In addition, during the Ph.D. course, I have contributed to the following side research activities concerning optical electromagnetic field applications:
▪ The design, fabrication, and characterization of a 2×2 optical fiber coupler based on indium fluoride optical fibers [11]. In particular, I have contributed to the fabrication by means the glass processing system, Vytran® GPX2400, supplied by the “Electromagnetic Fields” laboratory led by Prof. Francesco Prudenzano, by developing preliminary silica glass samples and by searching the fabrication parameters used for obtaining fluoride glass combiners.
▪ The design of a gain-switched pulsed laser based on a commercial, heavily holmium-doped fluoroindate glass fiber, emitting in the middle-infrared range, at the wavelength λ = 3.92 μm [12]. In particular, I have contributed to run several cases and discuss the obtained results
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
Researching mobile audiences: per un'analisi delle nuove territorialità mediali
No full textThis paper is aimed at investigating the patterns of media consumption at the intersection of old and new media which increasingly characterize urban spaces. The consumption practices, the discourses and competences which have great part in defining the way we inhabit and personalize our urban experience are increasingly shared and socialized in public spaces of the city. The present contribution draws on the findings of a research project on young people’s extra-domestic media diets and consumption practices, conducted in the city Milan through the adoption of a qualitative methodology which has combined participant observation of public spaces and narrative/ in depth interviews. The discussion of the findings provides the basis for reflecting upon methodological issues: breaking with the boundaries between old and new media, public and private space, domestic and extra-domestic media, production and consumption, the contemporary patterns of multiplatform consumption set new challenges to the researcher interested in understanding and describing these processes. There’s a need for a ‘mobile’ ethnography, able to provide an account of mobile consumption, and to embed in the research practice itself the increasing mobility and permeability among different realms of experience
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
Analisi comparativa della resa energetica di impianti per la generazione di energia elettrica da pannelli fotovoltaici e da colture a biomasse
No full textkoamabayili/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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