1,720,982 research outputs found
Performing data assimilation experiments with hydrodynamic models: A Java Sea case
No full textFloods are a big problem for Jakarta; the capital of Indonesia is subsiding below mean sea level and floods will become more frequent. Flood protection and measures against subsidence are, therefore, of high importance to Jakarta’s government. One of the options they are studying is a great sea wall to regulate the water levels in Jakarta Bay. These projects have to be tested and should be build to withhold extreme water levels. In order to simulate these water levels one can use a hydrodynamic model or look at observations. In theory these could be combined by using data assimilation which should improve the hydrodynamic model in such a way that it predicts the results for both observed as unobserved locations quite good. One of the most used data assimilation methods is the Ensemble Kalman Filter, which will be applied to an hydrodynamic model on the Java Sea. The model is simulated using Delft3D-FM and performs quite well as its results are in good correspondence with the observations. On this model data assimilation will than be applied, by making use of OpenDA, in order to further improve the model. With this set-up various twin-experiments will be performed to test the data assimilation method; some experiments with real observations will also be performed to test if it the set-up applicable in real projects. The experiments with real observations perform on the same level as the twin-experiments; the observations thus seem to be suitable for using in real projects. Unfortunately, the twin-experiment does not perform well; the assimilation worsens the results of the hydrodynamic model in both observed, as unobserved locations. In the assimilation process only one component, the localization, seems to performing quite well. This performance can not be studied fully, because the twin-experiments do not give correct results. It will be shown that future work is needed to research the various problems encountered, and that at the time of writing the assimilation with OpenDA does not improve the Delft3D-FM model on the Java Sea.Electrical Engineering, Mathematics and Computer ScienceDelft Institute of Applied Mathematic
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
The induction of teacher educators: the needs of beginning teacher educators
Full text linkVan Velzen, C., Van der Klink, M., Swennen, A., & Yaffe, E. (2008). The induction of teacher educators: the needs of beginning teacher educators. Paper presented at the ATEE Conference. August, 24, 2008, Brussels, Belgium.This paper discusses the set up and outcomes of an international study regarding the induction (socialization) of new teacher educators in various European countries
The induction and needs of beginning teacher educators
Full text linkVan Velzen, C., Van der Klink, M., Swennen, A., & Yaffe, E. (2010). The induction and needs of beginning teacher educators. Professional Development in Education, 36(1/2), 61-75.This article presents the results of an exploratory study into induction practices of novice teacher educators in six different countrie
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