1,721,220 research outputs found
Analysis of overtopping discharge over vertical tiers - headed wall
No full textThe numerical or empirical models are useful tools to understand the wave overtopping phenomena, but uncertainty remains on their applicability. It’s necessary to carry out monitoring campaigns or laboratory tests to support them. In this paper we apply the proposed in the EurOtop Manual to predict the flows over a vertical breakwater, marking the need to calibrate these methods to take into account the peculiar geometry of the outer breakwater. This was done by introducing appropriate correction factors. The results show improved accuracy when compared with the two-dimensional physical model tests conducted at the LIM laboratory in Barcelona
Convergenza di metodi di valutazione semi-empirici dell’overtopping per pareti verticali non convenzionali
No full textInterazioni tra funghi del genere Trichoderma e Myzus persicae (Hemiptera: Aphidoidea) per l'individuazione di strategie di controllo biologico
No full textGli afidi (Hemiptera: Aphidoidea) rappresentano uno dei più importanti gruppi di insetti nocivi delle piante coltivate. Studi in laboratorio hanno dimostrato che funghi del genere Trichoderma sono in grado di influenzare direttamente e/o tramite i loro metaboliti diversi aspetti della biologia degli afidi. La presente ricerca è stata condotta utilizzando la specie Myzus persicae, un afide cosmopolita e polifago. L’isolato Trichoderma harzianum ITEM 908 ha mostrato una considerevole attività entomopatogena, con effetti statisticamente significativi sulla riduzione della sopravvivenza degli afidi. E’ stata anche rilevata una maggior sensibilità delle forme alate, responsabili della dispersione e della colonizzazione di nuove piante. Una innovativa strategia di controllo degli afidi si basa sull’impiego di sostanze naturali in grado di interferire con il processo di scelta della pianta ospite. Colture degli isolati T. harzianum ITEM 908 e Trichoderma citrinoviride ITEM 4484 sono risultate in grado di esercitare un'azione fagodeterrente su M. persicae. I risultati ottenuti potrebbero costituire la base per lo sviluppo di nuovi principi attivi da utilizzare per la protezione delle colture agrarie da attacchi di afidi
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
Synthesis of Substituted Quinolines and Coumarins Through a Sequential Vinylic Substitution/ Annulation Process
No full textHigh-performance liquid chromatography for the analysis of fusapyrone and deoxyfusapyrone, two antifungal a-pirones from Fusarium Semitectum
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