1,720,962 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
Stochastic Seismic Response of RC Building and Multi-Span Bridge using Metamodel Approach
No full textVariability in geometry, material qualities, and loads all contribute to the stochasticity of a structure's dynamic response. Stochastic analysis gives a decent representation of the random dynamic responses. Stochastic analysis techniques fall into two broad categories: statistical and non-statistical. Although statistical methods such as Monte Carlo simulation are generally accepted as the gold standard for stochastic analysis, simpler, non statistical alternatives that need less processing resources without sacrificing accuracy are required. High Dimensional Model Representation is a relatively new non-statistical metamodel based methodology that is being compared in this work to traditional response surface methods including Central Composite Design, Box Behnken Design, and Full Factorial Design in the context of a dynamic response analysis. To examine the stochastic reactions, the High Dimensional Model Representation technique is used to the shape of a reinforced concrete frame utilising natural frequencies and nonlinear dynamic analysis. Results for the chosen issues were found to be comparable to those obtained using traditional sampling approaches, but with significantly less computational work required thanks to this technique. The recent earthquakes have shown that bridges, which are essential to transportation networks, are also one of the most susceptible parts of these networks. Bridge damage following an earthquake can hinder rescue attempts and lead to significant financial losses for affected towns. An examination of a bridge's seismic resilience both during and after an earthquake is crucial. While advances in design principles have greatly reduced bridges' seismic vulnerability, the earthquake research community remains deeply concerned about the possibility of damage to the culvert stock. The seismic risk evaluation of bridges makes extensive use of fragility curves. In this analysis, the fragility curves for multi-span bridges are presented, taking into consideration the uncertainties in the bridge's structural and material properties. Modern highways frequently have reinforced concrete box-girder bridges, therefore their seismic safety has been the subject of extensive study. However, the nonlinearity and variability in geometry, material parameters, and loading must be taken into account for a thorough seismic analysis of box-girder bridges. This study introduces a novel nonstatistical metamodel-based approach, high-dimensional model representation, to the generation of metamodels for chosen seismic behavior parameters of a box-girder bridge while accounting for uncertain input variables. Comprehensive finite element analysis is used to assess the seismic responses at the sample locations of the high dimensional model representation. In addition, the derived metamodels are used to construct seismic fragility curves, which is proven to be significantly easier than standard fragility analysis. This method yields conclusions that are consistent with those of two well-known response surface methods (Central Composite Design and Box Behnken Design), but requires vastly less simulations to reach a conclusion. High-dimensional model representation not only greatly simplifies the computing burden of fragility assessments by providing a failure metamodel that incorporates all relevant random variables, but it also gives a far more accurate representation of the underlying system. Direct Monte Carlo simulation is the foundation of the most accurate and robust method of seismic reliability analysis. However, it is difficult to compute since many nonlinear time history studies must be performed. In such cases, a metamodeling strategy using the response surface method can be a useful tool. In order to improve seismic reliability analysis of multi-span bridge piers, this work investigates the benefit of using an adaptive response surface method based on the moving least squares method. Three-dimensional finite element models of bridges are constructed on the OpenSees platform, with accurate representations of the bridge's components like the columns, super structure, bearings, and abutments, allowing for nonlinear time history analysis. High Dimensional Model Representation is a relatively new non-statistical metamodel-based approach that is being evaluated in this study in comparison to traditional response surface methods like Central Composite Design, Box Behnken Design, and Full Factorial Design for use in a dynamic response analysis
Sono-Electroplating of Cu-Ni Alloy Thin Films and their Corrosion Behavior
No full textThe proposed work is the development and optimization of electroplated/sono-electroplated CuNi alloy thin films with varying electrolyte bath concentration, applied potential, and its effect on the thin films properties and also to study the corrosion behavior of the film. In current study CuNi alloy thin film were electroplated from an electrolytic bath containing 0.75M NiSO4.6H2O, 0.195M H3BO3 and different concentration of CuSO4.5H2O (0.075M, 0.05M, and 0.0375) in order to obtain Cu-Ni molar concentration ratio of 1:10, 1:15, 1:20 respectively, at a current density of 30 mA/cm2 . A stainless steel circular bar with an exposed area of 0.5cm2 and a 5 cm long platinum rod of 0.2 cm diameter served as cathode and anode respectively. Depositions were carried out by varying the temperature (25º±2ºC) and bath concentration both in presence and absence of sonication. The synthesized thin films were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), atomic force microscopy (AFM) and surface profiler. XRD analysis confirmed that alloy formation was better in presence of ultrasound. SEM and EDS both surface morphology and composition of the thin film showed a strong dependence on the bath condition (silent and sonication), bath concentration and temperature. Residual stress analysis showed that a decrease in stress, increase in roughness and film thickness in presence of sonication bath. Corrosion behavior of films studied by using potentiostat with three electrodes setup which revealed that thin film synthesized under silent condition had better corrosion protective behavior as compared to films in ultrasonic condition. Electrochemical impedance spectroscopy (EIS) technology has used for affirming electrochemical reaction and provided more information about corrosion at the electrode/electrolyte interface
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
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
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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