1,721,855 research outputs found
Production, envoi et retransmission de sextos chez les adolescents : prévalence et facteurs associés
No full textLe terme sextage est la contraction du mot sexe et textage, et réfère à la production, l’envoi, la réception et la retransmission de contenu sexuellement explicite par les voies des communications électroniques (Barrense-Dias et al., 2017; Klettke et al., 2014). Une méta-analyse récente démontre que les comportements de sextage chez les adolescents ont significativement augmenté dans la dernière décennie (Madigan et al., 2018). Les conséquences négatives associées aux comportements de sextage sont nombreuses et elles touchent différentes sphères de la vie des jeunes et de leur entourage. La présente étude, qui s’inscrit dans un projet plus large, a évalué la prévalence et les facteurs associés à différents comportements de sextage chez les adolescents, soit la production, l’envoi et la retransmission de sextos. Les sextos ont été définis comme étant des photos ou des films qui démontrent la personne elle-même nue ou semi-nue (sexuellement explicite). Cette étude observationnelle transversale a été réalisée auprès de 1089 adolescent(e)s de secondaire 4 et 5 (âge moyen = 16 ans). Le taux de participation parmi les adolescents sollicités a été de plus de 98 %. Des questionnaires auto-rapportés ont été utilisés. Les résultats démontrent tout d’abord qu’environ un jeune sur quatre a déjà produit et a déjà envoyé des sextos et qu’environ 3 % des jeunes a déjà retransmis des sextos reçus à des tiers. Les régressions logistiques ont évalué 11 facteurs. Le genre féminin, l’attirance sexuelle autre qu’hétérosexuelle, l’impulsivité et un plus grand nombre de partenaires sexuels augmentent la probabilité de s’engager dans la production de sextos, tandis qu’une plus grande estime de soi, le fait de ne pas avoir eu de relation sexuelle et le fait de ne pas avoir eu de relation sexuelle occasionnelle en diminuent la probabilité. L’impulsivité augmente la probabilité de s’engager dans l’envoi de sextos, tandis qu’une plus grande estime de soi et le fait de ne pas avoir eu de relation sexuelle en diminuent la probabilité. Un plus grand nombre de partenaires sexuels augmente la probabilité de s’engager dans la retransmission de sextos, tandis que le genre féminin et le fait de ne pas avoir eu de relation sexuelle occasionnelle en diminuent la probabilité. L’étude démontre l’importance du phénomène du sextage chez les adolescents et la pertinence de sensibiliser les jeunes aux risques possibles de cette pratique. Les résultats pourront contribuer à l’élaboration de campagnes de prévention dans les médias et les écoles où le sextage devrait être abordé dans les cours d’éducation à la sexualité. De surcroit, la présente étude met en lumière la nécessité de considérer le sextage lors des interventions cliniques auprès des adolescents
Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe 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
The Effect of Asynchronous Earthquake Motion on Complex Bridges
No full textBased on observed damage patterns from previous earthquakes and a rich history of analytical studies, asynchronous input motion has been identified as a major. source of unfavorable response for long-span structures, such as bridges. This study is aimed at quantifying the effect of geometric incoherence and wave arrival delay on complex straight and curved bridges using state-of-the-art methodologies and tools. Using fully parametrized computer codes combining expert geotechnical and earthquake structural engineering knowledge, suites of asynchronous accelerograms are produced for use in inelastic dynamic analysis of the bridge model. Two multidegree-of-freedom analytical models are analyzed using 2,000 unique synthetic accelerograms with results showing significant response amplification due to asynchronous input motion, demonstrating the importance of considering asynchronous seismic input in complex, irregular bridge design. The paper, Part I of a two-paper investigation, presents the development of the input motion sets and the modeling and analysis approach employed, concluding with sample results. Detailed results and implications on seismic assessment are presented in the companion paper: Effect of Asynchronous Motion on Complex Bridges. Part II: Results and Implications on Assessment
Variations on the Author
No full text“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
Efficiency of alternative intensity measures for the seismic assessment of monolithic free-standing columns
No full textThis paper deals with the dynamic response of a free-standing ancient column in the Roman Agora of Thessaloniki, Greece as a means to shed more light on the complex behaviour of rocking bodies under seismic excitation. Numerical analyses utilizing discrete element method were carried out with the use of multiple seismic records selected based on the disaggregation of the seismic hazard for the region of interest. To identify their impact on structural performance, earthquake Intensity Measures, such as Peak Ground Acceleration and Peak Ground Velocity are examined for the case of a column that sustained no visible permanent deformations during the Ms=6.5 Thessaloniki earthquake of 1978. The analysis revealed a weak correlation of PGA and PGV with the response results and a significant influence of the mean frequency (fm) of the seismic motion. No coupling was found between the maximum displacement of the top during the oscillation and the permanent post-seismic deformations. The complementarity of both earthquake Intensity Measures in the structural vulnerability assessment is also depicted
Appropriate Similarity Measures for Author Cocitation Analysis
No full textWe 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
A critical review on the vulnerability assessment of natural gas pipelines subjected to seismic wave propagation. Part 1: Fragility relations and implemented seismic intensity measures
No full textNatural gas (NG) pipeline networks constitute a critical means of energy transportation, playing a vital role in the economic development of modern societies. The associated socio-economic and environmental impact, in case of seismically-induced severe damage, highlights the importance of a rational assessment of the structural integrity of this infrastructure against seismic hazards. Up to date, this assessment is mainly performed by implementing empirical fragility relations, which associate the repair rate, i.e. the number of repairs/damages per unit length of the pipeline, with a seismic intensity measure. A limited number of analytical fragility curves that compute probabilities of failure for various levels of predefined damage states have also been proposed, recently. In the first part of this paper, a thorough critical review of available fragility relations for the vulnerability assessment of buried NG pipelines is presented. The paper focuses on the assessment against seismically-induced transient ground deformations, which, under certain circumstances, may induce non-negligible deformations and strains on buried NG pipelines, especially in cases of pipelines crossing heterogeneous soil sites. Particular emphasis is placed on the efficiency of implemented seismic intensity measures to be evaluated or measured in the field and, more importantly, to correlate with observed structural damage on buried NG pipelines. In the second part of this paper, alternative methods for the analytical evaluation of the fragility of steel NG pipelines under seismically-induced transient ground deformations are presented. Through the discussion, recent advancements in the field are highlighted, whilst acknowledged gaps are identified, providing recommendations for future research
Dispelling the Myths Behind First-author Citation Counts
No full textWe 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
- …
