1,720,997 research outputs found
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
Interactions between physical forcing, water circulation and phytoplankton dynamics in a microtidal estuary
No full textMemoria de tesis doctoral presentada por Clara Llebot Lorente para optar al grado de Doctora por la Universidad de Las Palmas de Gran Canaria (ULPGC), realizada bajo la dirección de la Dra. Marta Estrada Miyares y del Dr. Jordi Solé Ollé del Institut de Ciències del Mar (ICM-CSIC).-- 212 pagesThis thesis focuses on the interactions between water circulation dynamics, nutrient availability and the structure of the phytoplanktonic community from a mesoscale point of view. To accomplish this aim we studied the micro-tidal estuaries of Alfacs and Fangar, located in the Ebre river Delta, in the Northwestern Mediterranean. The work was developed along three main lines. First, the analysis of the variability of a 14-year long time series of the phytoplankton and environmental data showed a strong seasonality of the phytoplankton communities of both bays, characterized by an autumn diatom assemblage and a winter group of dinoflagellates in Alfacs, and a flagellate-dominated group in winter, and a mixed group of dinoflagellates and diatoms in late spring and summer in Fangar. The phytoplankton dynamics and composition was different in the two bays, a finding that could be attributed to a lower residence time of the water in Fangar, which has a smaller volume than Alfacs but receives comparable inputs of freshwater. No relevant temporal trends were detected in phytoplankton abundance or composition. Second, scale considerations and a three-dimensional circulation model of Alfacs revealed that the principal forcing factors are freshwater inflow and wind, while the tide is not relevant regarding water transport or mixing. The freshwater input is important at a seasonal scale, and is responsible for the stratified situation usually found in Alfacs. The wind is particularly important at time scales of a few days and, above a certain threshold, wind events can mix the estuary and break the stratification. Based on the strength of the stratification relative to the wind speed, as expressed by a Richardson number, and the direction of the wind, three scenarios regarding the coupling between wind forcing and hydrodynamics have been defined, demonstrating the importance of wind in controlling the exchange of water with the exterior. Finally, the third line of research approached the budget of major nutrients (nitrogen N and phosphorus P) in Alfacs. A zero-dimensional ecosystem model incorporating phytoplankton, zooplankton and the concentrations of various (organic and inorganic) N and P pools suggested that the inputs of dissolved organic phosphorus (DOP) through the discharge channels are a crucial source of phosphorus to the system, explaining the draw-down of nitrogen during the summer and the observed high primary production. Two non-exclusive mechanisms could explain DOP availability for phytoplankton: direct uptake and remineralisation to dissolved inorganic phosphorus. Input of phosphorus from sediment resuspension could be important at short time scales, but did not seem to be a substantial contribution to the total P budget from a seasonal perspective. In conclusion, this thesis shows how the physical forcing can influence the composition, timing and abundance of the phytoplanktonic community in two bays that can be taken as an example of microtidal estuarine water bodiesPeer Reviewe
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Planes de gestión de datos de recuperación: una herramienta para recuperar datos de proyectos muy, muy desordenados - presentación
No full textThese slides present a practice paper submitted to the International Data Curation Conference 2018, with the same title. Data Management Plans (DMPs) are one of the most widespread tool that has been used in the last decade to encourage good data management practices among researchers. DMPs are a preventive tool and are traditionally used to manage data in the planning stage of the project, usually with grant proposals, when no data has been collected yet. DMPs, however, are not used to manage data that has already been collected without a plan. In this presentation we use a case study to argue that Data Management Plans are a useful document to improve the management of data of research projects that are in other stages of the research life cycle. In particular, we focus on the case of active projects where data has already been collected and is still being analyzed. We discuss the differences and commonalities in structure between preventive Data Management Plans and remedial Data Management Plans, and describe in detail the additional considerations that are needed when writing remedial Data Management Plan: the goals and audience of the document, the data inventory, and an implementation plan.Estas diapositivas representan un "practice paper" presentado en la International Data Curation Conference de 2018, que llevaba el mismo título. Los planes de gestión de datos (PGD) son una de las herramientas que ha sido más usada en la última década para fomentar buenas prácticas de gestión de datos entre investigadores. Los PGDs son una herramienta preventiva, y tradicionalmente se han usado para gestionar datos en las etapas de planificación de un proyecto, normalmente acompañando propuestas de proyectos. En este momento los datos todavía no se han recolectado. Los PGD, sin embargo, no se usan para gestionar datos que ya se han colectado sin planificación. En esta presentación usaremos un caso de estudio para argumentar que los planes de gestión de datos son un documento útil par mejorar la gestión de los datos en proyectos de investigación que estan en otras fases del ciclo de investigación. En particular, nos centramos en el caso de proyectos activos en los que los datos ya se han colectado y se están analizando. Discutimos las diferencias y los elementos en común en la estructura de los planes de gestión de datos preventivos, y los planes de gestión de datos de recuperación. Describimos en detalle los aspectos adicionales que se deben tener en cuenta para los planes de gestión de datos de recuperación: los objetivos, y la audiencia del documento, el inventorio de datos, y un plan de puesta en práctica del PGD
Hydrodynamic characterisation of a Mediterranean bay using Si3D, a three-dimensional model for estuarine circulation
No full textTrabajo presentado por Clara Llebot Lorent para obtener el Diploma de Estudios Avanzados del Doctorado de Ciencias del Mar por la Universidad de Las Palmas de Gran Canaria (ULPGC).-- 30 pages, 10 figures, 3 tablesDuring only eight months a year (April November) Alfacs Bay, an estuaric bay at North East of the Iberian Peninsula, receives freshwater from discharge channels located in its northern shelf. [...]Peer reviewe
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Remediation Data Management Plans: A Tool for Recovering Research Data from Messy, Messy Projects
Full text linkData Management Plans (DMPs) have been used in the last decade to encourage good data management practices among researchers. DMPs are widely used, preventive tools that encourage good data management practices. DMPs are traditionally used to manage data during the planning stage of the project, often required for grant proposals, and prior to data collection. In this paper we will use a case study to argue that Data Management Plans can be useful in improving the management of the data of research projects that have moved beyond the planning stage of the research life cycle. In particular, we focus on the case of active projects where data has already been collected and is still being analyzed. We discuss the differences and commonalities in structure between preventive Data Management Plans and remedial Data Management Plans, and describe in detail the additional considerations that are needed when writing remedial Data Management Plans: the goals and audience of the document, the data inventory, and an implementation plan
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