1,720,972 research outputs found
Trattamenti superficiali su leghe d’interesse ortopedico/Surface treatments on orthopaedic alloys
No full textLe protesi articolari e i dispositivi per il fissaggio osseo sono realizzati quasi esclusivamente in lega Ti6Al4V e lega CoCrMo in virtù della loro inerzia chimica in ambiente fisiologico. Queste caratteristiche sono però insufficienti a garantire il successo dell’impianto se non accompagnate da un comportamento tribologico adeguato alla funzione del dispositivo. Per migliorare le proprietà superficiali di entrambe le leghe sono stati proposti rivestimenti PVD in TiNbN su substrati in CoCrMo. Tali coating si sono dimostrati efficienti barriere al rilascio di ioni ma devono essere post-lucidati per mantenere il basso coefficiente di attrito verso il polietilene. Trattamenti di ossidazione PEO su substrati in Ti6Al4V si sono dimostrati promettenti alternative ai film sottili PVD, sia come barriera al rilascio di ioni, sia come miglioramento delle proprietà tribologiche del substrato.Articular replacements and trauma medical devices are mainly made of Ti6Al4V and CoCrMo alloys due to their chemical inertness in body environment. However, this characteristic is not sufficient to guarantee good implant performance if no adequate tribological resistance is also present. In order to increase the surface properties of both materials different surface treatment have been proposed. TiNbNPVD on CoCrMo has shown to be an effective barrier against ion release from the substrate, however it needs a final polishing treatment in order to maintain its low friction coefficient against polyethylene. PEO oxidation treatment on Ti6Al4V showed to be good alternatives to PVD thin films, both as ion release barrier and enhancing tribological substrate properties
Fisherman cooperation: the key for a successful conservation
No full textArtisanal fishery often offers the best opportunities for impact mitigation but it’s also the most traditional and difficult to change.
Trap fishery, an artisanal method that targets cuttlefish spawning adults in spring, exploits cuttlefish female attraction to traps for
egg laying. The present study estimated the impact of traps on cuttlefish eggs and tested the efficacy and suitability of a
management measure to mitigate this impact in the Northern Adriatic Sea. Results showed that over 3 millions of eggs, in less than
3 miles of coast, are likely destroyed by this fishery. The use of ropes, attached inside traps, allowed to collect on average 23.7%
of the eggs, without affecting catch rate of adults. The efficacy of this mitigation measure is discussed considering fishermen
attitude towards it
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
Biological traits of a sub-Antarctic nototheniid, Patagonotothen ramsayi, from the Burdwood Bank.
No full textThe rock cod Patagonotothen ramsayi (Regan
1913) is the most abundant species of the genus
Patagonotothen, occurring along the Patagonian shelf. It
plays an important role in the demersal food web both as
prey and predator, showing an increasing importance for
the local finfish and squid trawl fisheries. Age structure and
the reproductive traits were investigated from the population
inhabiting the eastern shelf of Burdwood Bank, which
represents the southernmost area of its geographical distribution.
Adult specimens of P. ramsayi were collected
during bottom trawling carried out in the austral summer.
The specimens were aged by otolith readings, and their
reproductive characteristics were assessed by macroscopical
and histological analyses. Age was similar between
sexes, ranging from 4 to 7 and from 4 to 8 years in
males and females of comparable size, respectively. GSI
was relatively low in females (\1.5 %), as fish were
sampled far from the reported spawning season (June–
August). Females were all in the early developing stage
(III) on the macroscopic maturity scale, with the most
advanced oocytes being in early vitellogenesis. The oocyte size distribution was bi-modal, with two partially overlapping
modes consisting of oocytes of a maximum size of
0.66 mm. A few large atretic oocytes (diameter[1 mm)
were found in three females. Absolute fecundity ranged
from approximately 30 to 120 thousands of eggs. No relationship
was found between female size and fecundity,
probably due to the relatively narrow range of the investigated
fish sizes. Males were in the spent (VII) or resting
(II) stages
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
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