1,720,990 research outputs found
Fitness for Service assessment of defected welded structural details by experimental evaluation of the fatigue resistance S-N curve
No full textDuring the fabrication of two different structures (a
ship and a bridge), made by mild construction steel, some unacceptable
anomalies were detected; the structures were almost
completely fabricated and a repair of the defected structural
details was impractical due to the extent of the defected zones.
A fitness-for-service assessment has therefore been carried out,
in both cases, by performing fatigue tests on representative
samples, cut off from the structure and by evaluating the fatigue
resistance curve. A re-assessment of the structural details in
question was undertaken, on the basis of the experimental SN
curve, evaluating the fitness for service of the Bdefected
details^. The experimental tests showed that the detected
anomalies had no influence on the fatigue strength of the
welded joints and that the examined details (a butt joint and a
cruciform joint) behave in accordance with the relevant FAT
classes. The experimental program has also given the opportunity
to compare different methodologies for fatigue assessment:
the Effective Notch Stress Method, the Fracture Mechanics
Method and the Peak Stress Method. The different procedures
have been applied to the tested specimens, and the expected
fatigue life was compared with the experimental one
Metodi avanzati per la verifica a fatica di giunti saldati di testa
No full textLo scopo principale del presente lavoro è la valutazione della
resistenza a fatica di un giunto saldato di testa, tipico della
carpenteria pesante ed in particolare delle applicazioni navali,
al variare di diversi parametri geometrici caratterizzanti la
giunzione stessa. Allo scopo, sono stati utilizzati tre differenti
metodi di predizione della vita a fatica, ovvero l'Effective
Notch Stress Approach, che è ormai di uso comune ed è supportato
da ampia bibliografia, il metodo della Strain Energy
Density (SED) ed il Peak Stress Method (PSM), due approcci,
quest'ultimi, di recente introduzione nella letteratura
scientifica ed ancora in fase di sperimentazione in ambito
industriale. Si sono inoltre condotte tutte le analisi mediante
l'impiego di due distinti codici di calcolo agli elementi finiti:
ANSYS® ed ADINA®. Il servirsi di diversi software FEM ha
permesso di verificare la bontà dei risultati ottenuti, di far
emergere alcune peculiarità fondamentali relative ai metodi
di estrapolazione dei valori dai punti di integrazione degli
elementi finiti e di estendere l'approccio del PSM ad un altro
software oltre a quello proposto dall'autore del metodo
(ANSYS®).The main aim of this work is the fatigue strength assessment of
a butt joint with weld reinforcement, typically used in steel
works and especially in shipbuilding applications when varying
different geometric parameters of the welded joint; to
this purpose, three different approaches for fatigue strength
estimates were applied, i.e. the Effective Notch Stress Approach,
which is now commonly used and it is supported by
a comprehensive bibliography, the Strain Energy Density approach
(SED) and the Peak Stress Method (PSM), the latter
ones newly introduced in scientific literature and still being
tested within industrial practice. Furthermore, all analyses
were carried out using two different finite element codes:
ANSYS® and ADINA®. The application of different FEM
software allowed verifying the quality of obtained results,
disclosing certain essential aspects related to the extrapolation
of values from integration points of finite elements and
extending the Peak Stress Method to an additional software
with respect to that proposed by the author of the method,
i.e. ANSYS®
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
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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