1,721,006 research outputs found
Studies of the spatial and temporal variability of microphytobenthos in the Venice lagoon.
No full textUlva rigida growth and decomposition processes and related effects on nitrogen and phosphorus cycles in a coastal lagoon (Sacca di Goro, Po River Delta).
No full textProcesses leading to dystrophy in a Po River Delta lagoon (Sacca di Goro): phytoplankton-macroalgae interactions.
No full textThe occurrence of a calanoid Australasian species, Boeckella triarticulata (THOMSON), in fish ponds of Northern Italy.
No full textRicerche sul fitoplancton e su crescita e decomposizione di Ulva rigida nella Sacca di Goro
No full textProduzione Primaria
No full textIl metodo per la determinazione della produzione primaria fitoplanctonica consiste nell’incubare dei campioni di acqua di mare in due bottiglie chiare ed una scura in cui viene inoculata una quantità nota di soluzione radioattiva (NaH14CO3). Le due bottiglie chiare servono a mediare le eventuali differenze dovute alla non omogeneità del campione e danno, come risultato, la misura della produzione primaria. La bottiglia scura permette di stimare valori di 14C organico di “background” e l’eventuale fissazione di C che può avvenire al buio, principalmente per cause fisiche e chimiche.
Il metodo si basa sull’assunto che l’assimilazione del 14C-DIC è proporzionale a quella del 12C-DIC, tenendo conto di un fattore di correzione che compensi la differente velocità di assimilazione della 14C rispetto al 12C
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
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