1,721,090 research outputs found
Evaluation de la qualité des rivières des Apennins (Italie) au moyen des indices diatomiques: le fleuve Foglia.
No full textAssessment of quality of the Apennine rivers (Italy) using the diatom indices: the
River Foglia. Within the framework of a monitoring program assessing the biological quality
of the central Italian watercourses, the benthic diatoms of the river Foglia (Marches region)
were studied for the first time. Nine sites were selected upstream and downstream of the
principal anthropological activities, which occur along all the catchment's area. Two
samplings were carried out: the first in October 2004 and the second in May 2005. In total,
145 taxa were observed, the large majority of which clearly indicate both organic and
mineral pollution, especially evident in the lower reaches of the river and in particular
during the period of low water conditions. The biological quality of the watercourse was
assessed using the Diatom-based Eutrophication/Pollution Index or EPI-D, developed for
Italian rivers. This index is based, above all, on the diatom sensitivity to nutrients, organic
matter and salt concentration, in particular the chlorides. It showed the bad water quality of
the river Foglia as well as an excellent correlation with other European diatom indices and
the chemical parameters
Evaluation de la qualité biologique de deux rivières de l'Italie centrale au moyen des indices diatomiques.
No full textBiodiversità algale in Sicilia: diatomee rare o notevoli del bacino idrografico del fiume Simeto.
No full textRuolo delle diatomee nell'applicazione della direttiva europea quadro sulle acque
No full textNell’ambito della Direttiva Europea Quadro 2000/60/CE, ai fini della valutazione della qualità dei corsi d’acqua, devono essere utilizzati gli elementi biologici che, oltre alla comunità dei macroinvertebrati e alla fauna ittica, comprendono la composizione e abbondanza della flora acquatica. Le Diatomee, in particolare, oltre a rappresentare la componente principale della biomassa bentonica dei corsi d’acqua, sono ormai riconosciute a livello mondiale come ottimi bioindicatori e possono pertanto rappresentare una comunità di riferimento per lo studio della componente vegetale acquatica. In numerosi paesi europei sono già stati sviluppati metodi biologici di valutazione basati sulle Diatomee e, in alcuni di essi (es. Francia, Spagna), tali metodiche sono già state integrate nei sistemi di valutazione della qualità che prevedono campagne di campionamento annuali
sul reticolo idrografico. La Direttiva in particolare, richiede di definire le condizioni di riferimento in ogni tipo di corpo idrico nelle differenti ecoregioni, al fine di poter valutare l’eventuale scostamento tra lo stato osservato ed il corrispondente stato atteso. A tutt’oggi
nessuno degli indici diatomici esistenti è strutturato secondo tale principio: sarà pertanto necessario un lavoro di adattamento ai requisiti della Direttiva Quadro sulle acqu
Communautés de diatomées des rivières de haute altitude sur substrats calcaire et siliceux (Trentino, Italie)
No full textDidymosphenia geminata (Lyngbye) M. Schmidt occurrence and bloom observation in Trentino rivers (northern Italy)
No full textDistribution et développement massif de Didymosphenia geminata (Lyngbye) M. Schmidt dans la province de Trento (Nord de l'Italie)
No full text
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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