1,720,955 research outputs found
State of Health Estimation of LiCoO2 Cells based on Impulse Response and ARMAX Identification
No full textLithium-ion batteries (LiBs) are subjected to different degradation mechanisms due to storage and operating conditions. State-of-health estimation (SOH) is crucial for proper prediction of battery aging and is usually related to the decrease in energy (capacity fade) or the increase in internal resistance (power fade). This paper evaluates the application of the Impulse Response (IR) method to LiCoO2 (LCO) battery cells for the estimation of SOH in terms of capacity fade. The IR method involves creating a precalculated table in which the cell voltage responses to input pulse currents are measured and stored for different states of charge (SOC) and SOH levels. To this aim, an LCO cell was cycled at constant current steps under fixed-temperature conditions. After a certain number of aging cycles, its voltage response to a current impulse was recorded at different levels of SOC. The same procedure was performed for different SOH levels to train multiple linear auto-regressive identification models. To validate the methodology and assess its precision, the trained models were used to predict the actual SOH level of the cell
Cycle Aging Effect on the Open Circuit Voltage of a Battery
No full textLithium-ion batteries (LiBs) are the most recent
technologies among rechargeable batteries. Currently, different
types of LiBs are available on the market, differing based on the
kind of electrodes and electrolyte they use. In any case, LiBs are
employed in many applications in both stationary and mobile
devices. On the other hand, LiBs degrade in function of the
storage and working conditions. Therefore, it is very important
to build accurate models that can predict the battery behavior
and estimate its parameters. Among the latter, the state of
charge (SOC) is one of the most important, which allows the
battery to work within its safety limits and prevent its aging. In
the literature, it is possible to find many methods for SOC
estimations. Most of them require modeling the open circuit
voltage (OCV) curve of LiBs, and several OCV-SOC models
have been developed as well. Moreover, it is important to model
how aging affects these OCV curves. In a previous work, a
simple aging model was proposed for a lithium cobalt oxide
battery. This model considers how the OCV curve changes as a
function of the cycle aging. In the present work, the aim is to
extend the latter model to a lithium iron phosphate battery
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
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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