1,722,136 research outputs found
Interfacial studies on high temperature systems
No full textThe first part of this work involves a study of the electrolytic decomposition of molten KSCN and molten LiCl-KC1 eutectic on vitreous carbon using potentiodynamic techniques. The electrolytic decomposition of KSCN melt is complex, and a reaction scheme is proposed to account for the observed behaviour. The salts were then used as a medium in which to study the physical and electrochemical nature of the interface between molten sulphur and vitreous carton. An abrupt change in the contact angle between liquid sulphur and vitreous carbon was observed on cathodic polarisation of the carbon surface in each medium. This change was recorded using microcine photography. Several possible explanations are proposed to account for this phenomenon, and double-layer capacity and interfacial tension experiments were performed to differentiate between the possibilities. The phenomenon was found to result from electrochemical reduction of sulphur, and a reaction mechanism for this reduction is proposed on the basis of evidence obtained from linear potential sweep experiments.The second part of this work involves a study of electrokinetic phenomena at molten salt/ceramic interfaces. A critical review of previous work is presented. A novel method of treating the experimental results from such measurements is proposed, and applied to the observed experimental data. The results indicate that Pb 2+ ions are adsorbed at the interface between molten PbBr2 and Pyrex and that N03 ions are adsorbed at the interface between molten NaN03and Pyrex.</p
Full-field measurements in experimental geomechanics: historical perspective, current trends and recent results
No full textModelling economies in transition: An introduction
No full textThis paper considers the implications of structural breaks, such as have occurred in many transition economies, for econometric modelling based on the multivariate cointegration paradigm. It outlines recent developments on the identification of linear cointegrated systems, discusses some practical problems, and presents an extension to non-linear systems. This is followed by a discussion of the impact of structural breaks on the identification and estimation of such systems. Finally, it relates these issues to the other papers in this volume
Strain fields and mechanical response of a high to medium fissured bentonite clay
No full textThis article presents the developments of an ongoing research aimed at modelling the influence of fissuring on the behaviour of clays. In particular, it recalls the main results of an extensive laboratory investigation on a fissured bentonite clay from the south of Italy and presents the data of a new investigation on the evolution with shearing of the strain fields developing within the clay, resulting from Digital Image Correlation (DIC). Element test results are analysed in the framework of continuum mechanics and linked to the clay fissuring features, once characterised using the Fissuring IDentity (F-ID) chart. This article compares the bentonite behaviour with that of other fissured clays of different F-IDs, highlighting the common behavioural features. Thereafter, the soil response at the macro level is related to the DIC-derived strain fields evolving within the clay with loading. For this purpose, DIC was successfully used to investigate the deformation processes active in the fissured clay and the sources of the localisation phenomena. DIC is shown to provide indications of the extent to which highly to medium fissured clays element test results can be of use to model the clay behaviour according to continuum mechanics
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
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