1,720,972 research outputs found
On the Cauchy problem for a general fractional porous medium equation with variable density
No full textWe study the well-posedness of the Cauchy problem for a fractional porous medium equation with a varying density ρ>0. We establish existence of weak energy solutions; uniqueness and nonuniqueness is studied as well, according to the behavior of ρ at infinity. © 2013 Elsevier B.V. All rights reserved
Development of personal and social autonomy in teenagers and young adults with Down Syndrome: an empirical study on self-representations in family relationships
No full textThis study aimed to investigate self-representations within the family andtheir effects on the development of adaptive skills in terms of personaland social autonomy. The target was a group of teenagers and youngadults with Down Syndrome (DS), compared with a group of non-disabled individuals. The purposes of this study were: 1) to show arelationship between the development of autonomy during adolescenceand the perceptions of feelings and attitudes experienced within the family; 2) to identify a link between a) family relationships which aremore oriented towards recognizing the maturation processes with thegoal of the autonomy of adolescents with DS, and b) the building of adequate self-representations with positive effects on personal and social
adaptation.The study sample was composed of 170 adolescents and young adults, 85 of whom have DS.The instruments employed were the Vineland Adaptive Behavior Scale-
Survey Form (VABS), which measures the level of Adaptive Behavior by three domains (Communication, Daily Living and Socialization), and the Family Relations Test: Children’s Version (FRTC), which assesses the feelings that the subject expresses and receives within the family.The data analysis showed that while all family members influence the level of autonomy in typically developing persons, individuals with DS are significantly influenced by their mothers. The results are discussed taking into account other relevant research, and the possible implications
for implementing prevention programs, as well as parenting and
development support strategies
Well-posedness for the cauchy problem for a fractional porous medium equation with variable density in one space dimension
No full textWe study the existence and uniqueness of the bounded solutions to a fractional nonlinear porous medium equation with a variable density in a one space dimension
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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