1,720,980 research outputs found
Analisi della portata variabile negli impianti a pompa di calore geotermica
No full textL’attenzione per le pompe di calore geotermiche è in continua crescita e la loro diffusione si sta estendendo anche ad applicazioni residenziali. In questo studio verrà eseguito un confronto tra le possibili tipologie di controllo applicabili al compressore della pompa di calore.
Si vedrà come tramite l’adozione dell’inverter sia possibile diminuire la temperatura di condensazione nel periodo invernale e aumentare quella di evaporazione nel periodo estivo, grazie al minor carico agli scambiatori di calore in parzializzazione e al controllo della temperatura all’utenza che permette di lavorare a temperature più vicine a quelle di ciclo. Con l’adozione dell’inverter inoltre si avrà un notevole risparmio in fase di accensione e gli spunti che il compressore dovrà eseguire nell’arco della sua vita saranno notevolmente diminuiti. Questo comporta sia un risparmio energetico sia una maggiore prospettiva di vita del compressore.
In particolare si vedrà come la regolazione a velocità variabile applicata al compressore brushless, porti notevoli vantaggi in ogni situazione di carico rispetto alle applicazioni con regolazione on-off e con motori asincroni trifase comandati da inverter.
Saranno valutati inoltre, i possibili vantaggi derivanti dall’impiego della velocità variabile alle pompe di circolazione sia alle utenze che agli scambiatori di calore a terreno
Developing a new frame for categorising use cases of RFID in the fashion and apparel sector
No full textThis paper proposes a new frame of reference for classifying the deployments of Radio Frequency IDentification (RFID) technique in the field of fashion and apparel retailing. This frame comprehends all different use cases that can be found in the apparel retail sector, and it updates and expands what has already been done in scientific literature in this field. After a comprehensive analysis of the scientific literature, business journals, web portals, websites and blogs, the mentioned frame was built and it counts two levels. At a first level, 6 different categories of use cases were defined and described. At a greater detail, i.e. at level 2, each one of these categories was broken into 1 to 4 specific use cases, and these level 2 use cases describe very precise objectives pursued by an RFID implementation in the given business sector. Eventually, the proposed frame was validated by a panel of industry partners. The authors believe that the frame of reference proposed could be extremely useful for researchers and practitioners, because it presents a comprehensive, complete and up-to-date framework for categorizing deployments of RFID in the apparel and fashion retail, outlining opportunities and new research spaces abut RFID deployments in the industry
Deploying RFID in the fashion and apparel sector: An "in the field" analysis to understand where the technology is going to
No full textThe paper performs a review of the literature of RFID deployments in the fashion and apparel retail sector: 95 papers from different sources were carefully analyzed and organized in a proper data base, and the contents of these papers were used to build a data base of RFID projects in the mentioned sector. The information stored in the data base were then organised in descriptive statistics that depict the situation of RFID projects: the statistics describe the papers we used to build our data base and, more important, the overview of RFID projects that we reviewed, such as the types of products where item-level tags are employed the most (apparel, footwear or accessories), the partition of projects and stores per geographic area and per type of projects (feasibility studies, pilot projects or full deployments). Also, the use cases of RFID pursued were reported, together with respective number of deployments and percentage values, and the same was done with results achieved, categorized in 6 main different clusters. Eventually, a statistics was reported to try to link the RFID use case investigated by a project to its possibility to evolve into a full deployment, and the results of this statistics could greatly help managers to choose the best use cases of RFID to be pursued for achieving competitive advantage
Developing a new frame for categorising use cases of RFID in the fashion and apparel sector
No full textThis paper proposes a new frame of reference for classifying the deployments of Radio Frequency IDentification (RFID) technique in the field of fashion and apparel retailing. This frame comprehends all different use cases that can be found in the apparel retail sector, and it updates and expands what has already been done in scientific literature in this field. After a comprehensive analysis of the scientific literature, business journals, web portals, websites and blogs, the mentioned frame was built and it counts two levels. At a first level, 6 different categories of use cases were defined and described. At a greater detail, i.e. at level 2, each one of these categories was broken into 1 to 4 specific use cases, and these level 2 use cases describe very precise objectives pursued by an RFID implementation in the given business sector. Eventually, the proposed frame was validated by a panel of industry partners. The authors believe that the frame of reference proposed could be extremely useful for researchers and practitioners, because it presents a comprehensive, complete and up-to-date framework for categorizing deployments of RFID in the apparel and fashion retail, outlining opportunities and new research spaces abut RFID deployments in the industry
Deploying RFID in the fashion and apparel sector: An "in the field" analysis to understand where the technology is going to
No full textThe paper performs a review of the literature of RFID deployments in the fashion and apparel retail sector: 95 papers from different sources were carefully analyzed and organized in a proper data base, and the contents of these papers were used to build a data base of RFID projects in the mentioned sector. The information stored in the data base were then organised in descriptive statistics that depict the situation of RFID projects: the statistics describe the papers we used to build our data base and, more important, the overview of RFID projects that we reviewed, such as the types of products where item-level tags are employed the most (apparel, footwear or accessories), the partition of projects and stores per geographic area and per type of projects (feasibility studies, pilot projects or full deployments). Also, the use cases of RFID pursued were reported, together with respective number of deployments and percentage values, and the same was done with results achieved, categorized in 6 main different clusters. Eventually, a statistics was reported to try to link the RFID use case investigated by a project to its possibility to evolve into a full deployment, and the results of this statistics could greatly help managers to choose the best use cases of RFID to be pursued for achieving competitive advantage
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
Variations on the Author
No full text“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
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
Dispelling 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
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