1,721,004 research outputs found
Dynamic simulation of a 4th Generation District Heating network with the presence of prosumers
No full textDistrict Heating Network is identified as a promising technology for the decarbonization of urban areas. Thanks to the surplus of heat available from distributed renewable energy plants, a typical heat consumer of the network could become an energy producer during the day (typically referred to as “prosumer”). Models for thermal grids developed during the years usually assumed a centralized heat production. The increasing presence of prosumers will require accurate dynamic modeling to monitor the changes induced in the thermohydraulic variables of the network. To fill this knowledge gap, this paper aims at developing a model of a thermal grid with prosumers in TRNSYS environment. The model allows for monitoring the main thermohydraulic parameters of the system and calculating the achieved energy and
emissions saving due to reduced generator and pumping consumption. As an example, the study assumes a ring-shaped network serving a cluster of 10 residential users located in Palermo (Italy). Different scenarios are proposed based on the presence of prosumers along the network and cooling by an absorption chiller is assumed. Results show a 26.1 % and 52.2% reduction in thermal losses when the temperature of the network is decreased from 100 ° C to 80 °C and 60 °C respectively. Moreover, the presence of prosumers could lead to an 18.7 % reduction in the energy produced by the centralized plant, and a 28.5% reduction in energy consumed for pumping
Efficientamento energetico di utenze domestiche nelle isole minori italiane
No full textL’articolo tratta l’efficientamento energetico nel settore residenziale delle piccole isole non connesse alla rete di trasmissione elettrica nazionale. L’analisi ha riguardato un’utenza tipo dell’Isola di Lampedusa, individuata sulla base dei dati statistici ISTAT, di cui sono stati acquisiti i dati di consumo da bolletta e monitorati i consumi elettrici al fine di selezionare gli interventi di retrofit più adeguati. Fra questi vi sono: la sostituzione degli scalda-acqua elettrici esistenti e il ricorso a tecnologie di Building Automation Control system (BACs) per la gestione dell’impianto di illuminazione e di altri carichi elettrici flessibili. La valutazione dei risparmi conseguibili è stata effettuata mediante simulazioni in regime dinamico. Ciò ha messo in evidenza come i migliori risultati si ottengono ricorrendo ad un impianto solare termico per la produzione di ACS con un risparmio mensile medio del 39% e utilizzando BACs sull’impianto di illuminazione con contestuale sostituzione degli apparecchi illuminanti con tecnologia a LED con un risparmio del 27%. Si è potuto inoltre verificare che tali azioni di retrofit consentono anche una riduzione dei picchi di prelievo nel diagramma di carico giornaliero determinando un beneficio per la rete di distribuzione dell’isola e per il sistema di generazione elettrico interamente oggi basato su generatori diesel
Development of a First Prototype for Low-Cost Kit for DLCs Design
Full text linkThis paper aims to present the development of a first prototype of a kit to improve the performance of the daylight control system during design, operating and post-commission steps: HW/SW components, procedures, and tools for the management of the control systems. In particular, these systems aim to support professionals in correctly designing, installing, commissioning, and post-monitoring lighting control systems using artificial intelligence techniques. Moreover, the design and development of the data acquisition system using an Arduino Uno WiFi with TSL2591 and its programming environment, with its variant of the C++ programming language, was utilized to acquire data from the sensors. The acquired data, were processed and transmitted to an online MySQL database. Furthermore, this paper presents the study that was conducted in order to develop the “box” of the prototype. Finally, the first measurement campaign is reported
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
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
- …
