1,721,036 research outputs found
A transport model with micro- and macro-structure
No full textFriedman, Avner; Knabner, Peter. (1990). A transport model with micro- and macro-structure. Retrieved from the University Digital Conservancy, https://hdl.handle.net/11299/1392
Flow and reactive transport in porous media induced by well injection: Similarity solution
Full text linkvan Duijn, C.J.; Knabner, Peter. (1992). Flow and reactive transport in porous media induced by well injection: Similarity solution. Retrieved from the University Digital Conservancy, https://hdl.handle.net/11299/2157
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
FESTUNG: A MATLAB/GNU Octave toolbox for the discontinuous Galerkin method. Part III: Hybridized discontinuous Galerkin (HDG) formulation
No full textThe third paper in our series on open source MATLAB / GNU Octave implementation of the discontinuous Galerkin (DG) method(s) focuses on a hybridized formulation. The main aim of this ongoing work is to develop rapid prototyping techniques covering a range of standard DG methodologies and suitable for small to medium sized applications. Our FESTUNG package relies on fully vectorized matrix / vector operations throughout, and all details of the implementation are fully documented. Once again, great care is taken to maintain a direct mapping between discretization terms
and code routines as well as to ensure full compatibility to GNU Octave. The current work formulates a hybridized DG scheme for a linear advection problem, describes hybrid approximation spaces on the mesh skeleton, and compares the performance of this discretization to the standard (element-based) DG method for different polynomial orders.The stay of A. Jaust at the University of Erlangen-Nurnberg was supported by the Research Foundation - Flanders (FWO) with a grant for a short study visit abroad and by the Special Research Fund (BOF) of Hasselt University
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
Mathematische Modellierung und Analysis von elektrolytischen Flüssigkeiten
No full textIn the first part of this thesis, we derive a thermodynamically consistent mathematical model for electrolyte solutions within the framework of nonequilibrium thermodynamics. Furthermore, by applying suitable simplifying assumptions, we show that this model reduces to the well-known and widely used family of Poisson–Nernst–Planck systems. Hence, for these classical models we provide a thermodynamical verification, we clearly reveal their limitations, and we present thermodynamically consistent extensions.
Moreover, we are concerned with the formation of particle clusters in electrolyte solutions. This ubiquitous and important process is known as coagulation. We derive a model for coagulation in electrolyte solutions, which is based on the Poisson-Nernst-Planck system. We connect this continuum mechanical system with the atomistic DLVO-theory. Thereby, we obtain a micro-macro model, which accounts for the short-range atomistic picture, the long-range continuum mechanical picture, the energetic DVLO-picture, and the kinetic picture of coagulation.
In the second part of this thesis, we present results for the global existence and uniqueness. We prove the global existence and uniqueness of weak solutions of the Darcy–Poisson–Nernst–Planck system, which is a field-scale model for electrolyte solutions in porous media. We consider multicomponent electrolyte solutions, which consist of a neutral solvent and charged solutes with arbitrary valencies
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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