1,721,189 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
Valutazione dell'incidenza dell'edema maculare microcistico post-operatorio valutato con tomografia retinica a coerenza ottica in due gruppi di pazienti sottoposti ad intervento di cataratta privo di complicanze trattati e non con FANS per via topica
No full textValuatzione dell'incidenza dell'edema maculare microcistico post-operatorio valutato con tomografia retinica a coerenza ottica in due gruppi di pazienti sottoposti ad intervento di cataratta privo di complicanze trattati e non con FANS per via topic
L’inibizione del sistema renina-angiotensina è un trattamento utile nei pazienti con Nefropatia HIV albuminurica?
No full textSi stima che circa dall’ 1% al 2% dei pazienti che iniziano la dialisi soffrano di malattia renale associata
ad HIV. La nefropatia associata ad HIV (HIVAN) si sviluppa in circa il 10% dei soggetti affetti da HIV, con
differente predilezione per soggetti di razza nera e ispanica. Fin dall’inizio dell’utilizzo su larga scala della
terapia antiretrovirale (ART), la HIVAN è stata caratterizzata da un rapido declino della funzione renale,
con progressione a malattia renale terminale (End-Stage Renal Disease). A parte il danno diretto dell'HIV
sul nefrone, numerose osservazioni sperimentali supportano la tesi secondo cui l’agiotensina II contribuisce
al danno ai podociti. Il trattamento con ACE-inibitori (ACE-Is), così come quello con bloccanti del
recettore dell'angiotensina (ARBs), può attenuare il declino della funzione renale nella HIVAN. Tuttavia,
i dati clinici sugli effetti di questi agenti antipertensivi in individui infetti da HIV sono ancora scarsi e i
dubbi devono ancora essere adeguatamente affrontati. Analizziamo qui gli studi che hanno indagato l'uso
di ACE-Is e ARBs nel trattamento dell'ipertensione nei pazienti con HIVAN e albuminuria.It is estimated that 1-2 % of patients starting dialysis suffers from kidney disease associated with HIV infection.
HIV-associated nephropathy ( HIVAN ) develops in about 10% of people living with HIV , with
different preference for Blacks and Hispanics . Since the beginning of large-scale use of antiretroviral
therapy (ART), the HIVAN has been characterized by a rapid decline in renal function , with progression
to ESRD ( End - Stage Renal Disease ). Aside from HIV direct damage to the nephron, numerous experimental
observations support the argument that the agiotensina II contributes to the podocytes damage.
Treatment with ACE - inhibitors (ACE - Is) , as well as the one with angiotensin receptor blockers ( ARBs),
may attenuate the decline in renal function in HIVAN . However, clinical data on the effects of these antihypertensive
agents in HIV-infected individuals are still scarce and doubts have yet to be adequately addressed.
In the following, we analyze the studies that have investigated the use of ACE -Is and ARBs in the
treatment of hypertension and albuminuria in patients with HIVAN
Il punto di vista del docente e dello studente con DSA a dieci anni dall’entrata in vigore della Legge 170
No full textIl contributo espone una rassegna dei principali elementi che hanno contribuito a far maturare una maggiore consapevolezza degli insegnanti sul tema dei DSA ad un decennio dall'emanazione della Legge 170/2010
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
Nuove evidenze sulle difficoltà di lettoscrittura di studenti universitari con una storia di dislessia
No full textDispelling 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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