1,720,971 research outputs found
Approccio ibrido ad aneurismi dell’aorta toraco-addominale in pazienti con pregressa chirurgia aortica
No full textApproccio ibrido ad aneurismi dell’aorta toraco-addominale in pazienti con pregressa chirurgia aortica
No full text
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
ENDOVASCULAR TREATMENT OF AORTIC ARCH ANEURYSMS
No full textaórtico é uma solução interessante para pacientes selecionados.
Objetivo: Comparar os sucessos técnico e clínico registrados nas
diferentes regiões anatômicas do arco aórtico após a colocação de
endoprótese.
Métodos: Entre junho de 1999 e outubro de 2006, 178 pacientes
foramtratados na nossa instituição devido a doenças da aorta torácica
com a colocação de endoprótese, sendo que o arco aórtico estava
envolvido em 64 casos. De acordo com a classificação proposta por
Ishimaru, a zona aórtica 0 estava envolvida em 14 casos, zona 1 em12
casos e zona 2 em 38 casos. Procedimentos de debranching do arco
aórtico e revascularização extra-anatômica dos troncos supra-aórticos
foram realizados em 37 casos para obter um adequado colo aórtico
proximal.
Resultados: Zona 0. Comprimento do colo proximal: 44±6 mm.
Sucesso clínico inicial de 78,6%: dois óbitos (acidente vascular
cerebral), um vazamento do tipo Ia. Seguimento médio de 16,4±11
meses com sucesso clínico a médio prazo de 85,7%. Zona 1.
Comprimento do colo proximal: 28±5 mm. Sucesso clínico inicial de
66,7%: 0 óbitos, quatro vazamentos do tipo Ia. Seguimento médio de
16,9±17,2 meses com sucesso clínico a médio prazo de 75%. Zona 2.
Comprimento do colo proximal: 30±5 mm. Sucesso clínico inicial de
84,2%: dois óbitos (um infarto cardíaco e uma embolização de
múltiplos órgãos), três vazamentos do tipo Ia, um caso de conversão
para operação aberta. Dois casos de paraparesia/paraplegia transitória
tardia foram observados. Seguimento médio de 28,0±17,2 meses com
sucesso clínico a médio prazo de 89,5%.
Conclusão: Este estudo e a análise da literatura demonstram que
o procedimento híbrido para moléstia do arco aórtico é factível em
pacientes selecionados com alto risco para a operação convencional.
Nossa experiência ainda é limitada pelo tamanho relativamente
pequeno da amostra. Sugerimos reservar a zona 1 para pacientes
inadequados para esternotomia ou em casos de comprimento do colo
aórtico proximal > 30 mm apos revascularização da artéria carótida
comum esquerda. Sugerimos realizar revascularização completa do
arco aórtico em pacientes adequados com um colo aórtico proximal
mais curto.Background: Endovascular approach to the aortic arch is an
appealing solution for selected patients.
Objective: To compare the technical and clinical success recorded
in the different anatomical settings of endografting for aortic arch
disease.
Methods: Between June 1999 and October 2006, among 178
patients treated at our institution for thoracic aorta disease with a
stent-graft, the aortic arch was involved in 64 cases. According to the
classification proposed by Ishimaru, aortic zone 0 was involved in 14
cases, zone 1 in 12 cases and zone 2 in 38 cases. A hybrid surgical
procedure of supra-aortic debranching and revascularization was
performed in 37 cases.
Results: Zone 0. Proximal neck length: 44±6 mm. Initial clinical
success was 78.6%: two deaths (stroke), one type Ia endoleak. At a
mean follow-up of 16.4±11 months the midterm clinical success was
85.7%. Zone 1. Proximal neck length: 28±5 mm. Initial clinical success
was 66.7%: 0 deaths, four type Ia endoleaks. At a mean follow-up of
16.9±17.2 months the midterm clinical success was 75.0%. Zone 2.
Proximal neck length: 30±5 mm. Initial clinical success was 84.2%:
two deaths (one cardiac arrest, one multiorgan embolization), three
type Ia endoleaks, one case of open conversion. Two cases of delayed
transitory paraparesis/paraplegia were observed. At a mean follow-up
of 28.0±17.2 months the midterm clinical success was 89.5%.
Conclusions: This study and a literature review demonstrated that
hybrid procedure for aortic arch pathology is feasible in selected
patients at high risk for conventional surgery. Our experience is still
limited by the relatively small sample size.We propose to reserve zone
1 for patients unfit for sternotomy or in cases with aortic neck length
> 30 mm following left common carotid artery debranching. We
recommend to performcomplete aortic rerouting of the aortic arch in
cases with lesser comorbidities and shorter aortic neck
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