305,247 research outputs found
Experimental characterization of Laser Induced Graphene (LIG) antennas for S-band wearable applications in 5G
No full textWidespreading 5G communication in the Internet of Things demands for eco-friendly antennas to avoid e-waste. Graphene is one of the most innovative materials with low environmental impact. To overcome its manufacturing complexity, laser scribing techniques have been recently developed. By means of a high power CO2 laser, polymers such as Polyimide are converted into a porous form of Graphene (LIG). In this paper, LIG is experimentally characterized in DC under different environmental conditions. Then its radiative performances are investigated by comparing them with the same copper-based antenna for S-band wearable communications. Experimentation revealed that the LIG antenna is practically insensitive to even variable environmental conditions
Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe 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
Analisi numerica e sperimentale del comportamento di sistemi semi-attivi con smorzamento non lineare
No full textAnalisi numerica e sperimentale del comportamento di sistemi semi-attivi con smorzamento non lineare
No full textDispelling the Myths Behind First-author Citation Counts
No full textWe 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
DISPOSITIVO SENSORE WIRELESS A RADIOFREQUENZA CONFIGURABILE E REGOLABILE
No full textLa presente invenzione si riferisce, in generale, al settore dei sensori wireless in radiofrequenza, particolarmente per interrogazioni di corto-raggio. Più in particolare, l’invenzione si riferisce ad una struttura che può essere applicata su, o incorporata in, un prodotto o materiale e che comunica in radiofrequenza con una unità di controllo remota, o lettore
Experimental tests and numerical modeling of magnetorheological dampers: the influence of model parameters
No full textAmong the different semi-active control devices proposed in literature, in the last years those one based on the properties of
the MR fluids have been attracting the interest of a large number of researchers. The structural control strategies need of a
clear and effective modelling of the mechanical and dynamical properties of magnetorheological (MR) dissipaters. In the
framework of a research project financed by the European Commission within the 5th FP (1998-2002), MR dampers have
been manufactured with European technology, and subsequently they have been tested during a wide experimental
campaign. The experimental behaviour of such devices turned out to be different from the one found in literature for similar
devices, and allowed the adoption of a more simple numerical model with respect to the most applied model in literature. In
the present paper, the semi-active MR devices tested in laboratory are characterized by using either a properly defined
model or the dominant model of literature, showing that the 2 model, even if characterized by a different complexity, yield the
same accuracy in fitting the experimental data
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