1,720,968 research outputs found
Performance of a floating treatment wetland for in-stream water amelioration in NE Italy
No full textFloating treatment wetlands are innovative systems and their processes are still scarcely known within the traditional methods of phytodepuration. To gain initial information on their performance and potential in removing pollutants two experiments have been conducted in north-east Italy, in a Natural Park with resurgent water. Barriers formed by a new patented floating element were tested in real climatic and water flow conditions. One experiment was conducted in a channel receiving aquaculture effluents, while the other was set in two cleaner channels to test two installation designs (two barriers composed of two lines of elements -2X2 design- and two composed of three lines of elements -2x3 design-). Different macrophyte species were used (Phragmites australis, Carex elata, Juncus effusus, Typha latifolia, Chrysopogon zizanioides, Sparganium erectum, Dactylis glomerata).
The floating systems were easily installed and required few maintenance operations. Native plants grew successfully, developing roots 90-135 cm deep one year after planting. Conversely, Chrysopogon zizanioides showed scarce adaptation to local conditions.
In the first experiment median chemical oxygen demand (COD) in water passing through the floating wetland system was reduced by 66%, biochemical oxygen demand by 52%, and total phosphorus by 65%. In the second experiment the 2x3 design had a slightly better performance than 2x2 in reducing COD (38% and 28% of removal respectively). The two designs performed similarly on NO3-N, reducing the incoming concentrations by 12% (2x3 design) and 14% (2x2). This form of nitrogen represents almost all the total nitrogen, which was abated by 13% by the 2x3 design and by 29% by 2x2 design
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
Letture e riusi di Tacito in Germania e in Italia tra la fine del XIX e gli inizi del XX secolo.
No full textIl contributo prende in esame alcuni esempi della ricezione e del riuso di Tacito tra Germania e Italia tra XIX e XX seoclo
L’immagine della Grecia antica in alcuni momenti del dibattito sul Beruf nella Germania dei primi decenni del Novecento
No full textIl saggio propone un percorso di lettura che va dal saggio di Alexander Schwab "Professione e gioventù" (1917) al celebre saggio di Max Weber sull'etica protestante e lo spirito del capitalismo (1904) e poi al saggio dell'economista Arhur Salz "Sulla storia dell'idea di professione" (1913) al fine di focalizzare il ruolo svolto da una certa immagine della Grecia antica in alcuni momenti importanti dell’acceso dibattito sull’idea di Beruf che ebbe luogo nella Germania dei primi decenni del Novecento
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
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