1,720,956 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
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
Porous media and foam application in battery thermal management systems: A comprehensive review focused on its impact, numerical modeling, and experimental preparation
Full text linkThe optimization of performance, safety, and longevity in electric and hybrid electric vehicles (EV/HEV) necessitates the implementation of efficient battery thermal management systems. In order to accomplish this objective, it is necessary to implement practical Battery Thermal Management Systems (BTMS) to regulate fluctuations in temperature and maintain a desired temperature range and distribution. Porous media and foams have been identified as viable approaches to tackle the aforementioned issues in thermal management systems effectively. The primary objective of this review paper is to provide an analysis of the developments, trends, and limitations pertaining to the utilization of porous medium and foam in BTMS. The underlying mechanisms and benefits associated with the utilization of porous media have been investigated with a particular focus on their influence on improving and optimizing heat transfer within BTMS. The paper analyzes a variety of porous media and foam structures, materials, manufacturing methods, and numerical modeling. Among the different properties of the porous media, porosity was found to have the most impact on BTMS performance and lower porosity leads to better heat transfer and lower maximum temperature (Tmax) and maximum temperature difference (ΔTmax). Also, the permeability of the foam needs to be optimized to keep a balance between the reduction of Tmax and any possible increase of ΔTmax. Porous media commonly employed in BTMS consist of carbon and metal-based foams, with copper foam being particularly significant owing to its superior thermal conductivity. Considering the dynamic nature of heat generation in lithium-ion batteries, Darcy-Brinkman-Forchheimer (DBF) and Local thermal non-equilibrium (LTNE) were found to be accurate for numerical simulations of porous media in BTMS. Furthermore, it has been underscored that further experimental and numerical investigations, as well as optimization analyses, are crucial for optimizing the thermal management systems of electric and hybrid electric vehicle batteries and maximizing the potential of porous media and foam. This paper concludes by proposing potential future research paths to highlight unexplored areas of research
Innovative hybrid battery thermal management system incorporating copper foam porous fins and layers with phase change material and liquid cooling
Full text linkIn the present numerical investigation, a hybrid battery thermal management system (HBTMS) has been studied which combines phase change material (PCM), copper foam as porous fins and porous layers, and liquid cooling. The system includes twelve 18650 Lithium-ion batteries encased in aluminium housing, with copper foam used as longitudinal porous fins within the PCM and as porous layer inside copper tubes within the cooling plates. The enthalpy-porosity model was employed for PCM simulation, and the Darcy-Brinkman-Forchheimer (DBF) model was used for copper foam. Local thermal equilibrium (LTE) and non-equilibrium (LTNE) models were utilized to simulate the porous fins and layers, respectively. Transient heat generation was considered based on a lumped-capacitance thermal model. This study addresses a key research gap by optimising the properties of porous fins and layers to enhance both passive and active cooling mechanisms, to effectively improve both thermal performance and energy density. The obtained results indicated the superior performance of porous fins compared to solid fins. The proposed HBTMS significantly reduces the maximum battery surface temperature by up to 9.18 K at a 5C discharge rate compared to pure PCM battery thermal management system (BTMS), while maintaining maximum temperature difference within the battery pack below 1 K, even at high 5C discharge rate. While porous fins with lower porosity improves conduction in the PCM, porous layers with higher porosity enhances convection within the copper tubes. Also, the utilization of porous fins, compared to solid fins, improves the energy density of the system by approximately 25%
Numerical analysis of copper foam-enhanced hybrid battery thermal management systems for lithium-ion batteries: advancing energy density and thermal control
Full text linkWith the growing demand for efficient and safe energy storage solutions, this study explores the effective and optimised integration of copper metal foam in hybrid battery thermal management systems (HBTMS). A novel HBTMS design is proposed, combining cooling plates with enhanced liquid cooling by metal foam layers in copper tubes and phase change material (PCM) cooling improved by copper foam longitudinal fins. Numerical simulations were conducted using a lumped-capacitance thermal model for transient battery heat generation, the enthalpy-porosity method for PCM, Darcy-Brinkman-Forchheimer (DBF), local thermal equilibrium (LTE) and non-equilibrium (LTNE) models for metal foam. Unlike previous studies that address passive and active cooling separately, present investigation uniquely integrates copper foam into both domains by enhancing conduction in the PCM and improving convection in the coolant channels. This integrated approach achieves superior thermal control, improved energy density, and ensures operational safety. The system’s performance under high 5C discharge rates demonstrated a significant reduction of about 9 K in the maximum battery surface temperature compared to pure PCM cooling while maintaining the maximum battery surface temperature difference below 1 K. The study highlights the optimal copper foam layer thickness of 4 mm, balancing improved heat transfer and minimal pressure drop. Furthermore, the incorporation of the metal foam layers reduced the number of required cooling plates, resulting in an 11 % improvement in energy density
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