1,721,033 research outputs found
Analisi della flora di un tratto della ex linea ferroviaria Bologna-Verona, un importante corridoio ecologico nella pianura emiliana centro-orientale = The flora of a part of the abandoned old railway Bologna -Verona, an important ecological corridor in the Emilian north-eastern Po plain
No full textViene descritta la flora del tratto ferroviario abbandonato della linea Bologna-Verona (Italia settentrionale). Il tratto indagato si trova tra la stazione
disabilitata di Tavernelle Emilia (provincia di Bologna) e Camposanto (provincia di Modena). Presenta caratteristiche ecologiche eterogenee perché
la sua struttura non si limita alla sola ferrovia, ma contiene anche ampie scarpate e un corridoio longitudinale tra la vecchia ferrovia e quella
attuale. L’area analizzata è stata divisa in 10 aree campione sequenziate. Sono state complessivamente rinvenute 348 specie vegetali. Il numero
di specie per segmento campione evidenzia la relazione tra complessità strutturale e ricchezza in specie: il numero di specie più elevato è stato
riscontrato sulla lunga rampa che dalla ex stazione di Bolognina porta la ferrovia in prossimità del fiume Panaro. Lo spettro delle forme biologiche
è caratterizzato dall’elevato numero di Terofite, sintomo di ambienti disturbati e fortemente dinamici. L’elevato numero di Fanerofite indica che la
comunità vegetale tende a una struttura più stabile. La forte presenza di specie mediterranee e termofile, maggiore rispetto al territorio circostante,
sottolinea che nell’area esaminata prevalgono habitat soleggiati e aridi. In Appendice la lista completa delle specie e sottospecie rinvenute con i segmenti in cui sono state rilevate.The flora of the old abandoned Bologna-Verona railway (Northern Italy) is described. This part lies between Tavernelle Emilia (Bologna province)
and Camposanto (Modena Province). It has heterogeneous ecological features because its structure is not limited to the railway only, but also
contains high slopes and a longitudinal corridor between the old railway and the current one. The analyzed area was divided into 10 sequenced
sample areas. 348 plant species were sampled. The number of species per sample area highlights the relationship between structural complexity
and species richness: the highest species number was found on the ramp that leads the railway near to the Panaro River. The life forms diversity is
characterized by the high number of Therophytes, as a sign of soil disturbed recently. The high number of Phanerophytes may be explained by an
incoming more stable vegetation structure. The high prevalence of Mediterranean and thermophilous species, which is greater than in surroundings,
underlines that sunny and arid habitats are prevailing in the area examined.
The Appendix contains the complete list of species and subspecies sampled, together with the indication of the sample area where they were found
Osservazioni preliminari su stazioni naturali di Viola pumila Chaix, specie rara del territorio emiliano
No full textWhen Archaeobotany meets Geoarchaeology : investigating fuel procurement in a historical Saharan oasis
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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
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
The archaeobotanical remains (pollen, seeds/fruits and charcoal)
No full textThe archaeobotanical data from Aghram Nadharif, consisting of pollen, seeds/fruits and charcoal analyses, made it possible to reconstruct the main traits of the plant landscape and economy by collecting cultivated and wild plant records. Sixty-six samples, selected from the sediment and naked-eye samples collected during the 1999-2001 excavations, were treated to extract pollen and isolate macroremains. In the deposit, abundant pollen and charcoal were found, wilst seeds and fruits were scarce. THe characterizing records were: (i) cultivated plants: Phoenix, well represented by pollen, fruits and charcoal; Ficus, recorded as pollen; Vitis, recorded as pips; cereals represented by frequent pollen and a few carpological records (mainly Hordeum, and a few Triticum, Panicum, Pennisetum and Setaria); (ii) wild plants: Tamarix, recorded as pollen, twigs and charcoal; Typha, recorded as pollen. Altogether, it emerged that during the Garamantian period the plant landscape was strongly influenced by human impact, with plantations occupying much of the oasis and wild vegetation restricted to the more distant wadi bed areas. Some woods, probably imported, were native to the Mediterranean basin (Pinus, Salix). The site was still inhabited in the medieval times, when peach trees (Prunus persica) were possibly also grown and wood from tropical regions (Commiphora) was imported. Nevertheless, it seems that the agricultural activities carried out in the area before the 1st century BC and the 4th century AD had already profoundly marked the territory. Date palms with small cereal fields and grape vines in their shade were the main cultivated plants near Aghram Nadharif
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