1,721,000 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
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
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
Modificazioni endocrine nell’aging male
No full textÈ ormai chiaro agli occhi di tutti quanto nell’odierna società, o almeno
in quella occidentale, più che in passato, l’aspetto fisico abbia un ruolo
ben più che marginale. Basti pensare alle centinaia di riviste, blog e
portali, specialistici o meno, che rivolgono la loro attenzione proprio a
questo interessante e peculiare argomento. Al confine tra la scienza
e la magia, da sempre l’uomo insegue il sogno di poter prolungare la
propria esistenza, mantenendo la bellezza esteriore che accompagna la
giovane età, affidandosi ad “elisir”, pozioni, riti o qualsiasi altro rimedio
in grado di contrastare il procedere del tempo. Ovviamente con gli anni
è stato possibile mettere a punto metodi sempre più precisi nel rilevare
informazioni preziose al fine di comprendere la fisiologia dei processi
alla base della conservazione del nostro organismo. Gli studi degli ultimi
anni confermano quanto già sospettato in precedenza riguardo al ruolo
delle modificazioni dei livelli ormonali nel corso dell’invecchiamento: ne è
un esempio il Late Onset Hypogonadism (LOH), progressiva diminuzione
dei livelli circolanti di testosterone nell’adulto, in cui è presente una
sintomatologia tanto fisica quanto psicologica (1,2,3). Altre conferme a
tal proposito emergono dallo studio delle alterazioni a carico dei distretti
extragonadici: la progressiva riduzione di attività dell’asse GH/IGF-I
diminuisce la lipolisi nonché la sensibilità periferica all’insulina, perdendo
col tempo il ruolo “anabolizzante”, fondamentale nella regolazione della
massa magra corporea, mentre a livello muscolare è stata riscontrata
una diminuzione della capacità di risposta al GH stesso. Altro ormone
certamente coinvolto nei processi di invecchiamento è il DHEA, insieme
al suo derivato DHEAs, in quanto se ne riconosce sempre più il ruolo
fondamentale in processi quali la risposta immunitaria durante le
infezioni virali, la memoria, l’integrità delle pareti vascolari, l’erezione
e molti altri, tutti attualmente oggetto di numerosi ricerche. Numerosi
studi osservazionali hanno, inoltre, mostrato un declino età-dipendente
dei livelli sierici di TSH (ormone tireotropo) e di FT3 (forma libera della
Triiodotiroxina), dimostrando come anche la funzionalità della ghiandola
tiroidea vada a inserirsi in questo quadro caratterizzato dal declino delle
funzionalità del sistema endocrino.In modern western society physical appearance has a well-recognized
role, surely more than in the past. Hundreds of journals, magazines,
blogs and websites point their attention towards this interesting and
fascinating topic. Halfway between magic and science, mankind has
always dreamt about finding ways to increase its lifespan while keeping
the beauty of young age, relying on elixirs, potions, rituals or whatever
else might help fighting the slow passing of time. Newer and more precise
methods of gathering information on the physiologic bases of aging
have been developed in recent years. Studies published in the last few
years confirm what was previously thought about the role of hormonal
changes in aging: the Late Onset Hypogonadism (LOH) a progressive
reduction in serum testosterone, is a clear example of how hormonal
decline causes both physical and psychological symptoms(1-2-3). Further
confirmations in this regard come from research on extragonadal axes:
the progressive decline of the GH/IGF-1 axis reduces lipolysis and the
peripheral sensibility to insulin, thus reducing its “anabolizing” role over
time, while a reduced response to GH has been observed in muscle cells.
DHEA and its derivative DHEAS are also involved in aging, as their role
in immunomodulation during viral infections, memory, erection, and
endothelial function has been extensively studied in recent years. Many
studies also showed an age-related decline in serum TSH and FT3, proving
that thyroid is another actor in the decline of the endocrine functio
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