1,720,962 research outputs found
Una procedura ottimizzata per gli audit energetici: primi risultati del progetto europeo Use Efficiency
No full textDall’adozione della direttiva europea 2010/31/UE sul rendimento energetico nell’edilizia, più progetti sono stati promossi dalla Comunità Europea con il fine di supportare l’implementazione della direttiva. Alcuni di questi sono stati finanziati nell’ambito del primo e secondo programma Intelligent Energy Europe (IEE) che favorisce opportunità non sfruttate e disseminazione sul tema del risparmio di energia e incoraggia la diffusione delle fonti rinnovabili.
Nell’ambito di queste attività il progetto Use Efficiency, in cui l’Università di Tor Vergata è coordinator di un consorzio di
12 partner provenienti da 10 Paesi della comunità europea, affronta il tema del miglioramento delle prestazioni nell’edilizia universitaria ottenibile mediante sia efficienza energetica che comportamenti virtuosi degli utenti.
Nella prima fase del progetto è stato effettuato un audit di primo livello (operational rating) per sei edifici di ciascuna delle nove Università del consorzio utilizzando gli strumenti normativi e procedurali nazionali a disposizione di ogni partner. Per gli edifici dell’Università di Tor Vergata è stato utilizzato un software nazionale commerciale; una volta prodotte le certificazioni per ogni edificio, è stato possibile individuare i due edifici più critici di ciascuna sede e, per detti, effettuare un audit di secondo livello impostato sull’asset rating utilizzando il software europeo EPA-NR.
Nella presente memoria sono riassunti modo di procedere e alcuni risultati relativi agli edifici dell’Università di Tor
Vergata, insieme con prime indicazioni sugli interventi proposti per ottimizzare i consumi energetici degli edifici critici del campus
Conceptual language for statistical data modeling
No full textWe describe a new language for statistical data modeling. The language offers a general framework for the representation of elementary and summary data, and has three main characteristics: (i) the types of modeling primitives it provides are particularly suited for representing objects from a statistical point of view; (ii) it includes a rich set of structuring mechanisms for both elementary and summary data, which are given a formal semantics by means of logic; (iii) it is equipped with specialized inference procedures, allowing to perform different kinds of checks on the representation. The language is intended to be used during the specification phase of a statistical database, which we consider a knowledge-driven activity, where the availability of both powerful structuring mechanisms and suitable reasoning techniques constitute a valuable tool to the designer. The main focus of this paper is on the formal foundation of our approach. We describe the syntax and the semantics of the language, and we discuss its use in statistical data modeling. Also, we describe the basis for devising inference techniques for our language. Such techniques are based on an interesting correspondence between the language and propositional dynamic logic
First Correlations for Solar Radiation on Cloudy Days in Italy
No full textRelationship between sky cloud cover and solar radiation is presented in order to give informations about solar radiation attitude varying with cloudiness, useful to optimize solar devices. Meteorological and solar data were recorded by Environmental Technical Physic Laboratories, at University of Rome Tor Vergata from April 15th 2009 to May 31th 2010. Those data were associated to hourly cloud observation recorded in the same site in order to calculate the ratio of global radiation at total cloud amount (N okta) G(N) to global radiation at cloudless sky G(0). The comparison between Kimura and Stephenson (1967) work, and Kasten and Czeplak (1980) parameterization were evaluated to characterize Tor Vergata’s site. The model of clear sky condition proposed by Duffie and Beckman (1980), Spena (1996), and Duchon and O’Malley (1998) were used to determinate the transmission coefficient for global radiation at cloudless sky. Monthly and seasonal formulas has been developed using power and polynomial functions: correlation coefficients were shown for each trend. The correlation coefficient R2=0,9 showed that the best approximation is given by polynomial function. The results has indicated that the curve shape of G(N)/G(0) ratio has a maximum for N=3, almost half cloud cover condition, for Rome’s latitude. The meaning for this behavior is that global radiation grow with scattered radiation growth. This correlation represent a new element useful to characterize Rome’s site and to compare radiation trend with others of different latitudes site, and climate
Prime valutazioni parametriche sulle prospettive di impiego dei biocarburanti sullo scenario energetico, normativo e territoriale europeo”
No full textSimulazione dinamica del comportamento termico degli edifici. Modelli delle pareti e indirizzi migliorativi della normativa
No full textPrime misure sperimentali outdoor sulle prestazioni dei moduli fotovoltaici in silicio amorfo integrati su superfici a diversa curvatura
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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
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
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