1,720,979 research outputs found
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe 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
Get PDF“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
Get PDFWe 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
Get PDFWe 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
Advances in Model-Based Design of Flexible and Prompt Energy Systems -- The CO2 Capture Plant at the Buggenum IGCC Power Station as a Test Case
No full textPre-combustion CO2 capture applied to integrated gasification combined cycle (IGCC) power plants is a promising technical solution to reduce CO2 emissions due to fossil-fuelled electricity generation in order to meet environmental targets in a carbon-constrained future. The pre-combustion capture process allows to effectively remove CO2 from synthetic gas prior its combustion at high partial pressures. In addition, the net energy efficiency of decarbonised IGCC plants is estimated to be higher than that of conventional pulverized coal steam power plants integrating carbon capture. However, the removal of CO2 leads to a high efficiency penalty for the thermal power plant and an increase in system complexity. Moreover, the integration of carbon capture into the very complex gasification process and combined cycle power plant leads to technical problems as far as dynamic operation is concerned. Transient performance of future IGCC power plants becomes extremely relevant in order to balance the rapidly growing share of electricity converted from inherently intermittent renewable sources, such as wind and solar energy. The work documented in this thesis was part of a larger research project involving the utility company Vattenfall, the Energy research Centre of the Netherlands (ECN) and the Delft University of Technology aimed at the development of pre-combustion CO2 capture technology to be applied in a future commercial-scale IGCC power plant. A unique, fully instrumented CO2 capture pilot plant was realized at the Buggenum IGCC power station in the Netherlands in order to demonstrate the technology, to investigate its performance and to generate data for model validation. The most relevant research objectives of this thesis are to improve and develop general tools and methodologies which i) facilitate detailed steady-state performance analysis and sophisticated optimization of process design and operating conditions and ii) enable studies on process dynamics already during the early design phase in order to support the choice of equipment and control strategies aiming at the improvement of transient performance. The tools and methods are developed for the case-specific analysis of the pre-combustion CO2 capture plant at the Buggenum IGCC power station. With respect to generalization, it is worth to highlight that the adopted system engineering techniques and tools are applicable to the design of a larger class of chemical and energy conversion systems with minor changes.Aerodynamics, Wind Energy, Flight Performance and PropulsionAerospace Engineerin
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
Analysis of the dynamic performance of a MEA-based carbon capture unit for coal-fired power plants
No full textOne of the possibilities to reduce our carbon footprint is carbon capture and storage (CCS) technology, whereby CO? is captured and kept for long-term storage in empty gas or oil fields. In this study the constraints and flexibility during transient operation of a post-combustion capture unit are assessed using an equilibrium-based dynamic model of the capture unit. The dynamic models are developed in Modelica, an open-source, object-oriented and equation-based language for the modeling of physical systems. Where possible, existing model libraries are used or modified in order to obtain a complete model of the capture unit. The plant utilizes monoethanolamine (MEA) as the absorption fluid. The dynamic model is validated with open-loop step response tests performed at the TNO pilot plant. Based on the performed validation, it can be concluded that the transient responses in terms of trend and time constant of the capture rate, absorber temperatures and solvent CO? loading are in good agreement with the experiments. In order to assess the operational flexibility of a capture unit, three test cases were defined and simulated with the validated capture unit model.Energy TechnologyProcess and EnergyMechanical, Maritime and Materials Engineerin
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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