1,721,037 research outputs found
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
Is pregnancy length in Martina Franca jennies influenced by lunar cycle?
Full text linkIn humans and animals there is a popular belief that spontaneous parturition, and therefore pregnancy length, could be influenced by the lunar cycle, but results from humans are often impaired by multiple variables of the studied population. In domestic animals those problems can be limited by studying restricted population, such as a single breed, reared under uniform conditions. The present study aimed to assess the possible influence of the lunar cycle on pregnancy length in Martina Franca jennies belonging to a single breeding farm. The retrospective study was performed on data collected from 96 Martina Franca healthy jennies with a normal singleton pregnancy course. The present study showed that, whit lunar cycle divided in 4 lunar phases, neither lunar phase at ovulation, nor lunar phase at foaling significantly influenced pregnancy length (371.8±6.45 days). Pregnancy length was not significantly influenced also by the month of the year in which ovulation and spontaneous foaling occurred, as well as by jennies’ age and foal’s sex. In conclusion, pregnancy length in Martina Franca jennies is very variable (335-395 days) but does not seem to be influenced by lunar phases at ovulation or at foaling, month of ovulation and foaling, and by jennies’ age and foal’s sex. Further studies are needed to clarify the reasons for this pregnancy length variability in Martina Franca donkey breed
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
Studio preliminare su alcune caratteristiche seminali morfometriche testicolari dello stallone asinino di Martina Franca
No full textLa valutazione delle capacità riproduttive dello stallone equino è un esame che viene eseguito di routine in animali
impiegati a fini riproduttivi. Nel cavallo sono state ormai ben descritte le linee guida per la definizione del potenziale
riproduttivo, mentre nell’asino sono stati condotti solo pochi studi riguardanti tale ambito. Lo scopo della presente
indagine è di descrivere alcune caratteristiche seminali e morfometriche testicolari dello stallone asinino di Martina
Franca
Rilievi ecografici della gravidanza precoce nell'asina di Martina Franca = Ultrasonographic evaluation of the early pregnacy in Martina Franca jennies
No full textIl monitoraggio ecografico delle prime fasi della gravidanza è una metodica largamente utilizzata nella cavalla per valutare lo sviluppo del prodotto del concepimento ed evidenziarne eventuali anomalie, mentre nella specie asinina sono presenti solo poche informazioni al riguardo. L’osservazione ecografica del conceptus tra l’8° e il 54° giorno di gravidanza, in sei asine di Martina Franca, ha rilevato che la blastocisti, identificata al 12° giorno, risulta mobile fino al 16°-18°giorno e che la sua velocità di crescita, dapprima (12°-18° giorno) molto elevata (3 mm/die), subisce un forte rallentamento (0,4 mm/die) dal 20° al 28° giorno per poi aumentare nuovamente dopo il 30° giorno (1,8 mm/die). L’embrione è riconoscibile dal 22° giorno, la sua attività cardiaca ed il sacco allantoideo si distinguono dal 26° giorno; il sacco vitellino è visibile fino al 44° giorno e la discesa ventrale del feto si completa al 50° giorno. La velocità di crescita del corpo del conceptus, moderata (0,6 mm/die) durante la fase embrionale (12°-40° giorno), diventa più rapida nella fase fetale (1,2 mm/die). I dati e le caratteristiche morfometriche del conceptus asinino, rilevati in questo studio, sono assimilabili a quanto precedentemente riportato sia nell’asina che nella cavalla.In the mare, ultrasonography is widely used during the early pregnancy for evaluating the development of the conceptus and for highlight abnormalities. Instead, in the jenny, the ultrasonographic appearance of the early pregnancy has not been jet thoroughly described. The ultrasonographic study of the conceptus between Days 8 and 54 of pregnancy in six Martina Franca jennies has shown that the blastocyst was detected at Day 12 and its mobility ceased on Day 17 The growth rate of the vescicle was very high (3 mm/die) from Days 12 to 18, reduced (0.4 mm/die) from Days 20 to 28, and then moderate (1.8 mm/die) after Day 30. The embryo was first detected on Day 22, the allantoic sac and the heart beat on Day 26. The yolk sac was detectable until Day 44, and the ventral descent of the fetus was complete on Day 50. The growth rate of the conceptus was moderate during the embryonic phase (between Days 12 and 40) and then higher during the fetal phase (after Day 40). Data and morphometric features of the donkey conceptus recorded in the present study were similar to those previously reported in jennies and mares
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