1,720,979 research outputs found
Studio sperimentale dei sistemi radianti a soffitto per la climatizzazione di degenze ospedaliere
No full textLa presente memoria descrive i risultati dei primi sei mesi di una ricerca relativa allo studio sperimentale delle prestazioni energetiche, di comfort e di qualità microbiologica dell’aria in degenze ospedaliere climatizzate mediante impianti ad aria primaria e sistemi radianti a soffitto.
Lo studio è stato sviluppato grazie alla collaborazione tra le Università di Ferrara, Bologna e Palermo, l’Azienda USL di Bologna e la Proter Imex di San Pietro di Feletto, azienda produttrice di sistemi radianti a soffitto.
Le indagini sono in corso a partire dalla stagione estiva del 2007 e sono state condotte installando nell’ambiente campione, ubicato all’interno del reparto Maternità dell’Ospedale Maggiore di Bologna, sensori per il rilievo in continuo delle temperature superficiali degli elementi attivi e passivi del soffitto radiante e delle superfici di confinamento (parete esposta all’esterno, finestre e pareti interne).
Oltre ciò sono stati monitorati, sempre in continuo, anche i valori termoigrometrici dell’ambiente e dell’aria primaria, nonché i valori della potenza termofrigorifera erogata dai pannelli. Ulteriori indagini termografiche hanno permesso di rilevare la mappa delle temperature superficiali per i pannelli attivi.
I primi risultati esposti confermano l’elevato livello di comfort raggiungibile a causa della sostanziale coincidenza tra temperatura dell’aria primaria e temperatura media radiante.
Ulteriori indagini microbiologiche hanno permesso di verificare che in una tale situazione impiantistica la concentrazione microbiologica dell’aria risulta pari alla metà di quella riscontrata in degenze ospedaliere di altri ospedali, del tutto simili sotto il profilo architettonico, dei materiali di finitura utilizzati e dell’affollamento, ma climatizzati con impianti ad aria primaria e radiatori. La speciazione delle piastre utilizzate per i rilievi microbiologici ha confermato la presenza in questo secondo caso di sporigeni e miceti correlabili alla presenza di polvere.
Tali risultati sono oggetto di indagini più approfondite al fine di stabilire in via definitiva un nesso causale tra concentrazione batterica e sistema di riscaldamento adottato, se di tipo convettivo o radiante
Defrosting of air-source heat pumps: Effect of real temperature data on seasonal energy performance for different locations in Italy
Full text linkIn this paper, dynamic simulations of the seasonal coefficient of performance (SCOP) of Air-Source Heat Pumps will be presented by considering three different heat pump systems coupled with the same building located in three different Italian municipalities: S. Benedetto del Tronto (42°58′ North, 13°53′ East), Milan (45°28′ North, 9°10′ East), and Livigno (46°28′ North, 10°8′ East). Dynamic simulations were conducted by employing the software package TRNSYS and by considering real weather data (i.e., outdoor air temperature and humidity as well as solar radiation) referring to the three abovementioned cities for a period of 8 years (2013–2020) and collected from on-site weather stations. Attention has been paid to the modeling of the heat pump defrost cycles in order to evaluate their influence on the unit’s seasonal performance. Results show that, when referring to different years, the thermal energy demand displays huge variations (in some cases it can even double its value), while the effective SCOP is characterized by scarce variability. Sensible variations in SCOP values are achieved for Livigno
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
Optimum sizing of cogeneration plants by means of a genetic algorithm optimization: A case study
Full text linkIn the context of increasing energy consumption, multi-generation systems such as combined heat and power generation (CHP) are attractive to meet the increasingly stringent requirements regarding energy saving in buildings. Hospitals are great consumers of energy, both electrical and thermal: the use of heating and cooling equipment for maintaining satisfactory comfort and indoor air quality for the patients as well as the adoption of several electrical health equipment result in the highest energy consumption per unit floor area of the entire building sector. In the present study, co/tri-generation systems’ optimal set-up, size and operation are investigated for small/medium size hospital facilities. More specifically, after the presentation of the energy consumption profiles for a medium size hospital with 600 beds, set as reference case for this study, a parametric analysis has been carried out varying the peak loads of the user. For each of the proposed scenarios, the optimal plant configuration (sizing of all the energy production systems) has been outlined by means of a numerical code (Trigen 3.0) in-house developed. Afterwards, in order to optimize the load distribution in a smart grid characterized by electrical, thermal, cooling and fuel energy fluxes, an ulterior numerical investigation has been performed. The software, named EGO (Energy Grids Optimizer) consists of a genetic algorithm procedure: it defines the optimal load distribution of a number of energy systems operating into a smart grid based on the minimization of an objective function which expresses the total cost of energy production. Finally, an economic analysis has been carried out in order to evaluate the profitability of the proposed CHP-heat pump scenario
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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