1,721,213 research outputs found
Thermal reduction of nitrogen oxides in exhaust gases of diesel engines
No full textA study on reducing NO in exhaust fumes of diesel engines has been carried out; simulated exhaust gas of engines fuelled with high sulphur content heavy oil was used for the experiments reported in this paper. The feasibility of thermal reduction of NO by addition of ammonia in presence of SO2 has been investigated. High reduction levels at NO and O-2 concentration values typical of exhaust gas have been obtained, more than sufficient to reduce NO outlet concentration values so as to fall within the Italian law limits on emissions. The efficiency of the process turned out to be dependent on temperature, ammonia/NO inlet concentration ratio, residence time in the high-temperature zone, NO and O-2 concentrations. the aim of the study was to get information on optimal reaction conditions and process yield, as well as on SO2 influence on the process. The reaction products were also characterized, in order to investigate on the destiny of excess ammonia sent to the reactor: N-2 turned out to be the main product. Moreover, for a reactor inlet molar concentration ratio [NH3](in)/[NO](in) less than or equal to 1.5 and an oxygen content in the gas higher than 4% the concentration of unreacted ammonia in the gases leaving the reactor was lower than 50 vpm. Only small concentrations of N2O were detected
IL SISTEMA GLUCOSINOLATI-MIROSINASI DELLE BRASSICACEAE PER IL CONTROLLO DEI PATOGENI DEL SUOLO E DELLA FRUTTA IN POST-RACCOLTA
No full textL’utilizzo degli ITCs prodotti dal sistema GLs-Mir, nel controllo dei patogeni del suolo offre risposte positive in termini di efficacia, gestione della fertilità dei terreni e riduzione dell’impatto ambientale nella coltivazione delle orticole. Il CRA-CIN in questo settore ha svolto un ruolo importante, selezionando genotipi specifici e sviluppando le competenze chimiche e biochimiche per la messa a punto dei mezzi tecnici per la biofumigazione. Tutto ciò ha determinato l’interesse di aziende private che hanno avviato la commercializzazione dei prodotti biofumiganti per un uso come ammendanti nella coltivazione di orticole in coltura protetta e in pieno campo, non solo in agricoltura biologica ma anche nell’agricoltura integrata e convenzionale, dove la tecnica inizia ad essere inserita nei protocolli di coltivazione. Con le sperimentazioni realizzate si è stabilito inoltre che la biofumigazione è una tecnica adatta anche per il trattamento dei frutti in postraccolta dove può contribuire al controllo di specifiche infezioni fungine sebbene l’applicazione debba essere perfezionata perché un uso improprio di questa tecnologia può indurre fitotossicità specialmente nei frutti refrigerati
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
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