177,022 research outputs found
Valutazione di metodi NIRS per la caratterizzazione rapida dei reflui a basso contenuto in sostanza secca
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La città come sistema complesso in crisi strutturale. Processi innovativi per il governo metropolitano. Strumenti innovativi per il governo metropolitano
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PolyRec Gesture Design Tool: A tool for fast prototyping of gesture-based mobile applications
No full textIn this article, we present PolyRec Gesture Design Tool (PolyRec GDT), a tool that allows the definition of gesture sets for mobile applications. It supports the entire process of designing gesture sets, from collecting gestures to analyzing and exporting the set created for use in a mobile application. It is equipped with the PolyRec gesture recognizer, a unistroke recognizer based on template matching with good accuracy and performances while still allowing support for other recognizers. The main features of PolyRec GDT include the ability to collect gestures directly on mobile devices, to detect similarities between gestures to help the designer to detect ambiguities in the design phase, and the ability to automatically select the most representative gestures for each gesture class by using a clustering technique to increase recognition speed without affecting accuracy. Experimental results show that this latter feature allows an increase in accuracy compared with when the same operation is performed manually by developers or randomly by software. Finally, a user study was carried out to evaluate PolyRec GDT, in which participants were asked to use it to add gesture functionality to a mobile application. The results showed that with the support of PolyRec GDT this operation took only a few minutes for participants with mobile development experience, whereas it would have taken much longer without the support of PolyRec GDT
Evaluation of four NIR spectrometers in the analysis of cattle slurry
No full textThe composition of animal slurries is basic information required to arrange fertilisation plans that allow satisfactory crop yields and avoid environmental pollution. Slurry management based on measured composition data requires the development and adoption of analytical methods that are rapid, affordable and applicable directly in the field. NIR spectroscopy is a candidate technique for this application. In the present work, the performances of four NIR spectrometers, differing in optics, detectors and price, were investigated and compared: one FT-NIR and one dispersive benchtop instrument; a less expensive diode array dispersive instrument also suitable for online applications; and a low-cost interferometric portable instrument. Ninety-nine slurries, collected from livestock farms in Lombardy (Italy), were characterised using reference methods for dry matter (DM), ashes (ASH), total nitrogen (TKN), ammonium nitrogen (AN), organic nitrogen (ON), total carbon (TC) and total phosphorus (TP) content, and were used to investigate the performance of the four NIR spectrometers. The calibrations obtained from the two benchtop instruments for DM, ASH, TKN and TC were classified "useful" or "moderately useful", while for AN and TP they were "useful for screening purposes". The two portable instruments provided less accurate calibrations, with the exception of DM and TC which, in the case of the diode array instrument, performed similarly to the benchtop spectrometers. The higher resolution and, to a lesser degree, the wider spectral range of the two benchtop spectrometers contribute to explain their better calibration performances for TKN and AN
Tipologie per la città e atipicità crescente
No full textLa complessità sociali delle popolazioni urbane e metropolitane è di solito compressa e formalmente ma non sostanzialmente appiattita in "tipi2 abitativi che possono essere al massimo complicati ma non complessi. Ne deriva un taso di notevole inadeguatezza tra la domanda "complessa" e l'offerta che complessa non è. Tale inadeguatezza penalizza gli strati sociali meno abbienti, le diversità "deboli" culturali, le utenze atipiche che, per numero e potenza politica, sono praticamente escluse perchè non espressamente accettate dalle norme edilizie e urbanistiche. . Il contributo ipotizza un sistema informativo di valutazione tra scelte tipologiche e utenze atipiche e della necessità di accompagnare tale sistema con un apparato semplificativo, strutturato come campo di comparazione tipologico
Appropriate Similarity Measures for Author Cocitation Analysis
No full textWe 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
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