1,720,996 research outputs found
The Sea Level Equation, Theory and Numerical Examples
No full textThe so–called “Sea Level Equation” is a linear, integral equation that governs the sea level changes due to the melting of the Pleistocene ice sheets and allows to model a suite of associated geophysical processes, including the postglacial rebound of the solid Earth, and the shape variations of the geoid. In this book we discuss the sea level equation for a spherically symmetric, linear viscoelastic Earth, assuming fixed shorelines and no rotational feedbacks. The theoretical aspects of the problem are presented in detail and only a basic knowledge of physics is demanded, that makes the discussion particularly oriented to non specialists of the field of global geodynamics. In the final part of the book we present some applications of the sea level equation in which we face the problem of predicting the Holocene and the present–day relative sea level variations, and the ongoing deformations of the solid Earth
The Sea Level Equation, Theory and Numerical Examples
No full textThe so–called “Sea Level Equation” is a linear, integral equation that governs the sea level changes due to the melting of the Pleistocene ice sheets and allows to model a suite of associated geophysical processes, including the postglacial rebound of the solid Earth, and the shape variations of the geoid. In this book we discuss the sea level equation for a spherically symmetric, linear viscoelastic Earth, assuming fixed shorelines and no rotational feedbacks. The theoretical aspects of the problem are presented in detail and only a basic knowledge of physics is demanded, that makes the discussion particularly oriented to non specialists of the field of global geodynamics. In the final part of the book we present some applications of the sea level equation in which we face the problem of predicting the Holocene and the present–day relative sea level variations, and the ongoing deformations of the solid Earth
SELEN: a Fortran 90 program for solving the "Sea Level Equation"
No full textWe present SELEN, a Fortran 90 computer program for solving the ‘‘sea-level equation’’, the law that governs the sea- level variations associated with the melting of the Pleistocene ice sheets. As shown here by a number of examples, SELEN also allows to study a suite of geophysical processes accompanying the mass redistributions associated with glacial-isostatic adjustment, such as vertical deformations of the solid surface of the Earth, and variations of the shape of the geoid. SELEN is built in a simple and easily testable manner, and requires modest computer resources. The source code, which is freely available on request, can be easily modified to implement new features of the sea-level equation or to focus on specific geodynamical aspects of glacial-isostatic adjustment
Recensione a: M. P. Stocchi, "Saggi e divagazioni tra letteratura e vita civile", Modena, Mucchi 2014 («Il vaglio. Nuova serie. Studi e testi di storia della cultura italiana», 69), pp. 470, «Lettere Italiane», 3/2015, pp. 601-607.
No full textLa recensione è dedicata al libro di M. P. Stocchi, "Saggi e divagazioni tra letteratura e vita civile" (Modena, Mucchi, 2014), che raccoglie studi di letteratura italiana che vanno dal Medioevo alla contemporaneità
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
- …
