1,720,993 research outputs found
A New Proof of the Geometric Sobolev Embedding for Generalised Kolmogorov Operators
No full textIn this note we revisit nonlocal isoperimetric inequalities and the related embeddings for Besov spaces adapted to a class of Hörmander operators of Kolmogorov-type (Garofalo and Tralli, J Funct Anal 279:108591, 2020). We provide here a new proof which exploits a weak-type Sobolev embedding (Garofalo and Tralli, Math Ann 383: 1–38, 2022)
Multiplicity of solutions for laminar, fully-developed natural convection in inclined, parallel-plate channels
No full textNatural convection in inclined channels is a rather common flow configuration: it occurs in solar energy
systems, ventilated roofs as well as in many industrial applications and chemical processes. Analytical
solutions for laminar, fully-developed natural convection in inclined parallel-plate channels are
presented in this paper. The Boussinesq approximation is applied and viscous energy dissipation is
neglected. One specific thermal configuration is addressed, where one wall is perfectly insulated and a
constant, uniform heat flux is released to the fluid from the other wall. The resulting set of governing
equations is non-linear, as the mean velocity is not assigned a priori but determined as part of the
solution.
Depending on the channel inclination angle and on the imposed heat flux conditions, either no solution,
one solution, multiple or infinite solutions exist. Under restrictive assumptions velocity profiles are
self-similar with respect to the channel inclination, while the temperature profile is independent of
the inclination. The two-dimensional, hydraulically- and thermally-developing natural convection
channel flow is simulated numerically for some combinations of channel inclination angle and heating
intensity to identify the most physical between the many solutions
Geometric Methods in PDE's: a conference on the occasion of the 65th birthday of Ermanno Lanconelli, Bologna 27-30 maggio 2008.
No full textThe scope of this conference is to celebrate the 65th birthday of Ermanno Lanconelli and to bring together italian and foreign Mathematicians to favour the discussion in the areas of research where Ermanno Lanconelli has been particularly active:
- Second order linear and nonlinear partial differential equations with non-negative characteristic form
- Geometric problems related to the underlying algebraic, geometrical or topological structure
- Application to complex geometry and CR manifolds
These fields are the objects of active research and development, and possess a remarkable degree of interrelation in their pure and applied aspects. In particular they find natural applications in mathematical finance, in the description of the visual cortex and in image processing
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
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