1,721,030 research outputs found
Intercastal communication in Reticulitermes lucifugus (Isoptera, Rhinotermitidae)
No full textDescription of intercastal communication in Reticulitermes lucifugus (Isoptera, Rhinotermitidae
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
Studio del comportamento alimentare dell'afide verde del pesco Myzus persicae mediante EPG-DC su pomodoro trattato con BTH (Bion)
No full textGeochemical-microscopical characterization of the deterioration of stone surfaces in the cloister of Santa Maria in Vado (Ferrara, Italy): case report
Full text linkSanta Maria in Vado is a monument in the rich artistic heritage of the city of Ferrara (North of Italy). In this paper we want to investigate the state of conservation of tombstones, cloister and the entrance to the basilica, in order to keep them in the best possible state for the future generations. From the chemical characterization, the state of conservation was determined focusing on the biodeteriogenic and non-biodeteriogenic factors, which determine a series of unwanted changes in the physical, mechanical and above all aesthetic properties of the material, often closely connected with the environment and conservation conditions. On the macroscopic observation, the state of conservation of the tombstones appeared to be very deteriorated through aesthetic and structural damage. In detail, the stereo microscope observation of samples collected from the tombstones show the presence of efflorescence probably caused by the abundant of water that bring the salts present inside the rock into solution. Relating the columns, μ-XRF analysis confirm the carbonate composition of samples and presence of iron and sulfur. Finally, SEM observation highlighted the presence of black crust on arch samples and the presence of pollen on the black crust and spheroidal particles probably related to atmospheric pollution
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
Comunità ad Artropodi di aree prative in un contesto agrario: ruolo dell'habitat e del paesaggio
No full textNelle regioni ad agricoltura intensiva la semplificazione degli habitat e del paesaggio determina strutture a mosaico in cui, in
una matrice di coltivi, persistono poche porzioni di habitat naturali o rinaturalizzati. La sopravvivenza, al loro interno, di vari
organismi, fra cui gli Artropodi, può dipendere, oltre che dall’idoneità dell’habitat stesso, anche da talune caratteristiche del
paesaggio. Chiarire i fattori ambientali che sottendono i pattern di biodiversità delle comunità ad Artropodi in un paesaggio
agricolo può fornire indicazioni per una corretta pianificazione e gestione territoriale. La ricerca intrapresa nel Mezzano
(Ferrara) vuole costruire un modello esplicativo della struttura di comunità in un pool di aree a vegetazione spontanea di
origine recente e a basso contrasto rispetto alla matrice agraria, considerando come variabili predittive alcuni descrittori
dell’habitat (struttura vegetazionale, contenuto in carbonio organico e in acqua del suolo), del paesaggio (connettività fra aree,
uso del territorio circostante) e della configurazione spaziale (dimensioni e distanze fra le aree). Il modello multivariato
sembra indicare relazioni fra alcune caratteristiche locali dell’habitat (diversità floristica e complessità architettonica della
vegetazione), le modalità di gestione applicate e struttura di comunità (ricchezza in specie e densità). Meno importante sembra
essere la struttura paesaggistica nel condizionare le comunità, che risultano dominate da taxa vagili e ad ampia diffusione sul
territorio
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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