1,720,966 research outputs found
L'endoscopia operativa nel trattamento dell'esofago di Barrett. Le tecniche resettive ed ablative.
No full textAggiornamento sulle strumentazioni per colecistectomia eseguita tramite via transvaginale: attualità e prospettive future della NOTES.
No full text
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe 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
Get PDF“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
Get PDFWe 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
Get PDFWe 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
Wall injury after colonic polypectomy : comparison between steel and tungsten snares
No full textP0229 WALL INJURY AFTER COLONIC POLYPECTOMY: COMPARISON
BETWEEN STEEL AND TUNGSTEN SNARES
G. Galloro1, L. Magno1, P. Iovino1, S. Ruggiero1, T. Rappa1, C. Meola2,
G.M. Carlomagno2. 1General Surgery and Advanced Technologies, 2Department of
Aerospace Engineering, University of Naples Federico II, Naples, Italy
INTRODUCTION/OBJECTIVES: Electrosurgical current used in polypectomy can
cause thermal injury to digestive wall with complications such as bleeding, postpolypectomy
syndrome, and perforation. To reduce the rate of these complications, we
studied the materials snares are made of. We compared steel and tungsten endoscopic
snares, evaluating the depth of colonic wall injury caused by electrosulgical current
during endoscopic polypectomy on an animal model, using cut, coagulation, and blend
current.
AIMS & METHODS: Polypectomies were performed on a live pig, under general
anesthesia, with a double channel colonoscope. To simulate the polyp stalk, the
colonic mucosa was gathered into the snare by a grasper and the snare closed.
Electrosurgical current was applied 15 times at each of 3 current modes. The procedure
was performed using either a steel or a tungsten snare with same size, shape, and profile
(Innovamedica, Milano, Italy). Colored hemoclips were used to identify the sites. After
polypectomies, the colon was removed and examined by a blind pathologist. To define
the reasons of behaviour of two snares, we reproduced, on an ex-vivo model, the same
conditions of polypectomy described above. Thermal measurements were achieved by
an infra-red thermocamera.
RESULTS: There is significant difference in the depth of tissue injury in the three
different current modes using both steel and tungsten snare. In details, using steel snare,
coagulation provokes significant deeper tissue injury compared to pure cut (p<0.001)
and blend current (p<0.05). Using tungsten snare, there is significant deeper tissue
injury by coagulation compared to pure cut (p<0.01); there is no significant difference
in depth of injury between coagulation and blend. Using both steel and tungsten snares
there is no difference beween cut and blend. Steel snare provokes significant deeper
tissue injury than tungsten snare using pure cut (p<0.05) and blend (p<0.05). There
is no significant difference in depth of tissue injury between steel and tungsten snares
using coagulation. About thermal behaviour of two materials, infra-red thermocamera
findings show a quicker sudden rise and drop in temperature of the tungsten snare,
and a better uniform standard temperature distribution, if compared to steel snare.
CONCLUSION: In tungsten snare, heat is homogeneously distributed and well
concentrated allowing a better and selective cut. Thermal properties of tungsten make
it very well-suited for the manufacturing of electrosurgical devices. Our results suggest
that tungsten should be preferred in the manufacturing of electrosurgical endoscopic
devices thanks to its lower rate of thermal-related complications.
Disclosure of Interest: G. Galloro: No conflict of interest to declare, L. Magno: No
conflict of interest to declare, P. Iovino: No conflict of interest to declare, S. Ruggiero:
No conflict of interest to declare, T. Rappa: None Declared, C. Meola: No conflict of
interest to declare, G. Carlomagno: No conflict of interest to declare.
Endoscopy 2010; 42 (Suppl I) A15
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
- …
