1,721,083 research outputs found
Eco-innovazione dei processi produttivi: analisi e azioni di intervento per l'efficentamento energetico
Full text linkLa crisi congiunturale ha notevolmente appesantito la situazione del Settore della Pesca già strutturalmente difficile. Nel “Rapporto Annuale sulla Pesca e sull’Acquacoltura in Sicilia”, redatto dall’Osservatorio della Pesca, si afferma che “in un contesto prospettico così difficile la quantità di energia specifica, ossia energia consumata per kg di prodotto (kWh/kg di prodotto), necessaria a fornire il prodotto ittico sul mercato deve diventare un indicatore guida per le politiche di ammodernamento ed innovazione. Pertanto è necessaria un’opportuna conoscenza di tutti i consumi energetici necessari per la produzione che, grazie all’utilizzo di pochi e significativi indicatori (quali l’energia per unità di prodotto, la quantità d’acqua per unità di prodotto e le emissioni ed i rilasci inquinanti per unità di prodotto), consenta di descrivere dinamicamente lo stato e la tendenza della filiera ittica”.
In tale quadro, è evidente che il fattore energetico rappresenta una componente che ha una rilevante incidenza sulla competitività della Filiera e che, spesso, i vari anelli produttivi “pagano” costi di gestione elevati a causa dell’inefficienza energetica.
In un contesto di consumatori sempre più attenti al rispetto ambientale e alla sostenibilità dei prodotti, l’impatto che i sistemi produttivi non efficienti hanno sull’ambiente ha un ritorno negativo anche rispetto all’immagine complessiva della Filiera e dei prodotti: in tal senso, la mancanza di sistemi di gestione ambientale efficaci ed adeguati può risultare, nel lungo periodo, un elemento di penalizzazione sui mercati.
Nel progetto “Centro di certificazione e prova del Distretto”, Piani di sviluppo di filiera, linea di intervento: 5.1.1.1 – piano integrato dei servizi comuni, l’attività svolta da questo laboratorio, ECO-INNOVAZIONE DEI PROCESSI PRODUTTIVI, ha lo scopo di calcolare i consumi energetici delle aziende del distretto, prese in esame come campione di studio, e studiare le possibili azioni per ottimizzare, mitigare i consumi e/o l’impatto ambientale come minore emissione di CO2 in atmosfera.
Tali attività consentiranno al Distretto, alle sue aziende e tutte le altre aziende del settore di poter conoscere l'energia consumata e quella potenzialmente risparmiata dalle eventuali azioni di efficientamento che saranno proposte da questo gruppo di lavoro
Mixed-Integer Algorithm for Optimal Dispatch of Integrated PV-Storage Systems
No full textThe exploitation of combined PhotoVoltaic plants and storage systems is nowadays assuming growing importance, due to the technical, environmental and economical benefits which can derive from an optimal integration. In this paper, a mixed-integer algorithm for the optimal dispatch of a storage system, based on the day-ahead photovoltaic forecasting is developed. The optimization objective is the maximization of the total production of the integrated system, according to a requested active power profile, which can be defined by the operator. The study case of an existing Distribution Management System, which operates on the Low Voltage microgrid at University of Genova is analyzed. The procedure is validated by field results with particular attention to the storage round-trip efficiency
UV‐Solar Photocatalysis for the Simultaneous Removal of Arsenic and Mercury in Washing Solutions from Polluted Marine Sediments
Full text linkAn environmentally sustainable strategy has been developed for simultaneously removing arsenic and mercury from wastewater, potentially coming from washing of polluted marine sediments. Citric acid (CA), a biodegradable chelating agent, forms stable complexes with both metals, which can be extracted from contaminated sediments through ex situ sediment washing. A solar photocatalytic method has been developed to separate toxic metals from wastewater and degrade CA. Increasing the TiO2 photocatalyst load enhances arsenic adsorption under dark conditions. Total arsenic removal is achieved during photocatalytic decontamination using 1000 ppm of TiO2. Fe(III)–hydroxides formed in the presence of Fe(III) further adsorb arsenic. Nearly total arsenic removal is achieved even under seawater conditions and visible light irradiation only. The removal of arsenic in different oxidation states has been successfully demonstrated. The UV–vis/TiO2/CA photocatalytic system has also proven highly effective for mercury removal from wastewater. Although seawater conditions slightly slow the removal process, complete mercury removal is achieved even under visible light irradiation. Finally, a combined photocatalytic approach has been developed for the removal of both arsenic and mercury, achieving 100% removal within few minutes of light irradiation. The reaction mechanism has been depicted based on intermediates and reaction products detected during the photocatalytic process
Advanced operational functionalities for a low voltage Microgrid test site
No full textThis work aims to describe the implementation of a renewable energy based Microgrid test site facility at the University of Genova (Italy) and to depict the advanced functionalities there implemented within the national supported project Smartgen. The developed advanced Distribution
Management System (DMS) is based on a Supervisory Control And Data Acquisition (SCADA) system for the remote monitoring of a Low Voltage Microgrid composed by a photovoltaic (PV) plant, an ion-lithium energy storage system, electrical load and a weather station. The implemented DMS is embedded with advanced functionalities which provide 36 hours forecasting of the load consumption and renewable generation. The forecasted data are also used to optimally program and manage the storage device. The proposed algorithms are described and also implementation aspects are reported within the paper
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
Intentional islanding of Microgrid by frequency support with building HVAC system
No full textThe paper proposes a control strategy for managing the load associated to the HVAC system of a building. The idea is to use the thermal energy stored into the building to contribute to frequency response during emergency conditions and improve islanding transition. The frequency dynamics of a Microgrid, following a disturbance on the main grid, can be improved using load response. A test network model of a commercial microgrid has been implemented in a dedicated simulation environment, in order to evaluate the performance of the microgrid frequency response and the effectiveness of the proposed technique. A comparative study against a dynamic response using a BESS (Battery Energy Storage System) is also investigated
Prevalence, Defining Characteristics, and Related Factors of the Nursing Diagnosis of Anxiety in Hospitalized Medical-Surgical Patients
No full textPurpose: To document the prevalence of the nursing diagnosis of anxiety in hospital patients, based on its level of severity, defining characteristics (DCs), and other related factors, and to identify the key DCs that serve as predictors of clinically significant anxiety (CSA). Design: Cross-sectional study. We enrolled 116 consecutive adult patients hospitalized from October 10 to 16, 2016, in medical-surgical wards within the first 48 hr of admission. Methods: The potential DCs and related factors of anxiety were collected based on the NANDA International terminology. Anxiety was considered clinically significant when presenting at moderate, severe, or panic level. The differences in DC prevalence among patients having or not having CSA were analyzed by unpaired student's t-test. Multivariate analysis was used to examine the independent association between the DCs and CSA. Findings: The prevalence of CSA was 36.2% and was significantly higher in patients who were older, female, and taking anxiolytic drugs, and among those who had cancer. The most frequent related factor for CSA was major change in health status. In the logistic regression, the presence of the DCs helplessness, altered attention or concentration, and anguish independently increased the odds of having CSA, whereas subjects presenting with Diminished ability to problem-solve had about a 96% reduction in the likelihood to suffer from such a condition. Conclusions: A high prevalence of CSA among medical-surgical patients was shown. Furthermore, a critical cluster of DCs useful to identify CSA was found. Clinical Relevance: The ability to accurately diagnose CSA should help prescribe and deliver the appropriate nursing interventions
- …
