1,720,966 research outputs found
Applicazioni avanzate di osmosi ed ultrafiltrazione per il trattamento di matrici complesse
Full text linkLa ricerca è rivolta al trattamento di matrici liquide complesse a sostegno del riutilizzo, della qualità idrica e del recupero energetico, attraverso applicazioni avanzate di trattamento a membrana.
Le strategie per raggiungere tali obiettivi coincidono con l’adozione di sistemi di trattamento integrati e rivolti alla minimizzazione del rifiuto liquido in accordo con il concetto dello scarico liquido zero.
Il processo applicativo è dedicato al trattamento del percolato di discarica, dei reflui industriali, dei surnatanti anaerobici e al trattamento acque reflue urbane. Le tecnologie utilizzate sono state l’osmosi inversa (RO), l’osmosi diretta (FO) e l’ultrafiltrazione (UF). Rispetto ai trattamenti convenzionali la filtrazione a membrana consente di ottenere un’ottima qualità dell’effluente ma è caratterizzata da aspetti limitanti quali lo sporcamento e i costi operativi. La mitigazione del fouling viene affrontata definendo i parametri operativi ottimali di processo e con l’adozione di sistemi di filtrazione multistadio.
In ambito ingegneristico, l’applicabilità del trattamento è affiancata dall’analisi di fattibilità tecnico-economica mediante il Valore Attuale Netto (VAN) che ha permesso di valutare il costo di trattamento per i percolati di 3.27 €/m3. In tale ambito la filtrazione RO risulta conveniente per recuperi di acqua superiori al 90%. Questo risultato è stato confermato dalle prove sperimentali ed il permeato è risultato conforme ai limiti allo scarico per corpi idrici superficiali. Per la stessa matrice è stata studiata l’applicazione dell’FO, processo meno energivoro che ha permesso di ottenere un recupero del 70% in configurazione FO-RO, con una draw solution NaCl. Sono stati definiti i flussi diretti di macroinquinanti e il flusso inverso di sale attraverso la membrana FO.
Lo studio del processo UF in configurazione AnMBR ha permesso di identificare le condizioni idrodinamiche sostenibili (SGDm) per il raggiungimento del bilancio energetico neutrale
Multistage filtration for leachate discharge in surface water: operative parameters and performances.
No full textOsmosis process for leachate treatment in industrial platform: Economic and performances evaluations to zero liquid discharge
No full textUpgrading for zero liquid discharge of full scale industrial platform for leachate treatment: economical evaluations and performances optimization
No full textProduction of greenhouse gases from biological activated sludge processes: N2O emission factors and influences of the sampling methodology
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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
Dinitrogen oxide (N2O) emission in the treatment of urban wastewater via nitrite: influence of liquid kinetic rates
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