1,720,963 research outputs found
Polemical Social Representations in Social Media: “Snapchat Dysmorphia”
No full textIntroduction. On social media, it’s possible to create a personal online identity, even very different from the real one. Scientific literature indicates that in some cases there may be a risk of incurring serious problems, such, for example the Body Dysmorphic Disorder (BDD). BDD regarding the use of filters to edit the body image is called “Snapchat Dysmorphia.
Theoretical background. The Social Representations Theory (SRT) -even if it was formulated during the last century- can be used to read and to interpret emerging phenomena like “Snapchat Dysmorphia”.
Aims. The purpose of the research is to analyze the communication about “Snapchat Dysmorphia”, identifying which type of post (written post, photo or video) is the most common among the hashtags considered, the words and the emoticons used in the captions on the three main social media (Facebook, Instagram and Twitter).
Hypotheses. During the first step of the research, and behind the choice of the #, there were some expectations.
- The comparison between the representations of the real body and of the edited body (H1);
- The rejection of the imperfect body, far away from the beauty standard stereotypes (H2);
- The promotion of the acceptance of imperfections, following the body positivity movement (H3).
Method. Through the use of six hashtags (snapchat dysmorphia, beauty standard, Instagram reality, selfie dysmorphia, filter no filter, unrealistic beauty standard), the contribution analyses posts published in English on Facebook, Instagram and Twitter in 2021. The analysis were made with the IRAMUTEQ software and the result was the Descending Hierarchical Classification (DHC).
Results. The DHC produced six classes: comparison between the own body and the others’ body; comparison between the real body and the edited body; positive value dimension; negative emotional/value dimension; stereotypes of beauty; filter and edited body parts. The results show key elements of the S.R.T.: the emotions, the values, the attitudes and the stereotypes of snapchat dysmorphia.
Impacts of the work. Because of the close bond between social representations and practices, the study, in its application value, supports the body positivity actions aimed at reducing the spread of “Snapchat Dysmorphia”
Numerical Evaluation of Cavitating Flows Using Different Two-Phase Models
No full textThis paper focuses on the modeling of cavitating flows by means of a barotropic law of state. Within a robust 2D Navier-Stokes, capable to handle the complex aspects of cavitating flows, different cavitation models are implemented. In particular two different classes of barotropic cavitation models have been used: a sinusoidal model and a quasi-homogeneous isenthalpic cavitation model suitably modified to account for thermal effects. The paper deals with the differences between these models and hence with the differences with the resulting flow fields. The analysis has been made for the flow over an ogival headform
A Numerical Tool for the Investigation of Cavitating Flows in Turbopump Inducers
No full textA numerical tool for the simulation of cavitating flows is presented in this paper. The numerical model is based on the 2D Euler/Navier-Stokes equations with a barotropic state law, which are solved in body fitted coordinates using a robust spatial and temporal differencing scheme. The model has been validated comparing numerical and experimental results on ogival and hemispherical axisymmetric head forms at different cavitation numbers. Simulations of the flow around a NACAOO 15 airfoil have also been successfully performed. Then, 2D simulations of the blade-toblade flow at a fixed radial position of a 9° Helical Inducer have been carried out at various cavitation numbers. Water has been assumed as the working fluid. Cavitating regions of increasing size have been computed, until the cavitation bubble covers the entire blade profile; a good agreement is observed between the computed cavitation number and the values obtained both experimentally and through an empirical correlation for the case at which choked conditions are attained
A Modified Bubbly Isenthalpic Model for Numerical Simulation of Cavitating Flows
No full textThis paper presents the development of a quasi-homogeneous isenthalpic cavitation flow model, suitably modified to account for the effects of thermal cavitation and the concentration of active nuclei. The proposed modified bubbly isenthalpic cavitation model has been implemented in a 2D numerical code in order to readily assess, by comparison with experimental results from the literature, its potential for the simulation of cavitating flows. Two types (hemispherical and 2-caliber ogival) of axisymmetric headforms and a 2D modified NACA 66-109 hydrofoil have been chosen for validation of the model against available data (Rouse & McNown, 1948; Shen & Dimotakis, 1989). The flow temperature has been varied from to in order to highlight the influence of thermal cavitation effects. Good agreement of the model predictions with the available experimental data has been found in terms of pressure distribution, extension of the cavitation region and loads (forces and moments) on the hydrofoil. As expected, the results indicate that the stability of the numerical method is sensitive to the temperature of the flow and to the presence of recirculating regions in the flow. Convergence problems have been detected at high angles of attack and when approaching room temperature, as a consequence of the inherent unsteadiness of reverse flow regions and the extremely rapid changes of the flow density in the absence of significant thermal cavitation effects. Examples are presented to display the influence of the relevant flow parameters on the solution
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
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