1,720,995 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
Dislocazione di un impianto dentale nel seno mascellare: caso clinico e revisione della letteratura
No full textOBIETTIVI. La dislocazione degli impianti dentali a livello del seno mascellare è una seria complicanza che spesso segue un’inadeguata riabilitazione del mascellare superiore. Scopo dello studio è descrivere un caso di migrazione implantare nel seno mascellare. MATERIALI E METODI. Il paziente è stato sottoposto a una riabilitazione del mascellare superiore attraverso metodiche
di rigenerazione ossea, tra cui un rialzo di seno bilaterale. Dopo 6 mesi di attesa per la guarigione
degli innesti ossei è stata eseguita la chirurgia implantare. Ai successivi 6 mesi dall’inserimento delle fixture è emersa la presenza di una fistola suppurante a livello dell’impianto 1.6: una radiografia endorale di controllo ha confermato la dislocazione dello stesso. A distanza di
7 giorni si è proceduto al recupero chirurgico della fixture implantare in anestesia locale attraverso l’antrostomia precedentemente eseguita per il rialzo di seno.RISULTATI E CONCLUSIONI. Una volta ottenuta la guarigione del sito chirurgico, confermata sia clinicamente sia radiograficamente,
si è proceduto alla protesizzazione degli impianti restanti. La migrazione implantare è stata causata, in questo caso, dalla scarsa stabilità primaria dell’impianto associata a una qualità non ottimale dell’osso innestato.Objectives
The displacement of dental implants into the maxillary sinus is a potential complication, often following an insufficient rehabilitation of the posterior precemaxillary area. The aim of our study is to describe a case of implant migration through the bone graft.
Materials and methods
The patient received a total superior rehabilitation through bone regeneration methods, including bilateral sinus lifts. Implants were placed after a 6-month maturation period. At 6 months after fixture insertion, a suppurating fistula in 1.6 area appeared: a radiographic exam showed the implant displacement. One week later, the surgical recovery of the displaced implant was performed under local anaesthesia through the antrostomy previously created for the sinus lifts.
Results and conclusions
After clinical and radiographic evaluation of the surgical site healing, the remaining prosthetic phase was initiated. It is our opinion that, in this case, implant migration was caused by low primary stability associated with inadequate bone quality
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
Identification of differential photosynthetic-related changes in response to temperature and light intensity in a ‘winter’ and ‘spring’ barley genotype and in the derived segregating doubled-haploid population
No full textThe winter cold-resistant parent 'Nure' is an Italian two-rowed feeding barley cultivar, while the spring and cold-sensitive parent 'Tremois' is a French two-rowed malting variety. The response of the two genotypes have been characterised under several conditions of acclimation and stress to abiotic factors (chilling and freezing temperature, high light intensity, high temperature) using chlorophyll fluorescence and gas exchange analysis. The genotypes were contrasting not only for different levels of stress tolerance acquired after acclimation but also for a different capacity to induce earlier responses to stress conditions; this was especially evident in variation of chlorophyll fluorescence parameters at high light intensity associated to acclimation temperature and in different sugars accumulation in leaves and roots at low temperature.A segregating population of doubled haploid (DH) lines was derived by anther culture from the F1 generation of the 'winter' x 'spring' barley cross 'Nure' x 'Tremois', and a first analysis of a total of 136 Doubled-Haploid lines has been carried out
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
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