1,724,526 research outputs found
How to enable large format 4680 cylindrical lithium-ion batteries
Get PDFThe demand for large format lithium-ion batteries is increasing, because they can be integrated and controlled easier at a system level. However, increasing the size leads to increased heat generation risking overheating. 1865 and 2170 cylindrical cells can be both base cooled or side cooled with reasonable efficiency. Large format 4680 cylindrical cells have become popular after Tesla filed a patent. If these cells are to become widely used, then understanding how to thermally manage them is essential. In this work, we create a model of a 4680 cylindrical cell, and use it to study different thermal management options. Our work elucidates the comprehensive mechanisms how the hot topic ‘tabless design’ improves the performance of 4680 cell and makes any larger format cell possible while current commercial cylindrical cells cannot be simply scaled up to satisfy power and thermal performance. As a consequence, the model identifies the reason for the tabless cell's release: the thermal performance of the 4680 tabless cell can be no worse than that of the 2170 cell, while the 4680 tabless tab cell boasts 5.4 times the energy and 6.9 times the power. Finally, via the model, a procedure is proposed for choosing the thermal management for large format cylindrical cell for maximum performance. As an example, we demonstrate that the best cooling approach for the 4680 tabless cell is base cooling, while for the 2170 LG M50T cell it is side cooling. We conclude that any viable large format cylindrical cell must include a continuous tab (or ‘tabless’) design and be cooled through its base when in a pack. The results are of immediate interest to both cell manufacturers and battery pack designers, while the developed modelling and parameterization framework is of wider use for all energy storage system design
Linked collectors and determiners for: Colecção do Herbário da Universidade Eduardo Mondlane.
No full textNatural history specimen data linked to collectors and determiners held within, "Colecção do Herbário da Universidade Eduardo Mondlane". Claims or attributions were made on Bionomia by volunteer Scribes, <a href="http://bionomia.net/dataset/397b0ae4-460e-4680-9625-73ab82f99ac1">https://bionomia.net/dataset/397b0ae4-460e-4680-9625-73ab82f99ac1</a> using specimen data from the dataset aggregated by the Global Biodiversity Information Facility, <a href="https://gbif.org/dataset/397b0ae4-460e-4680-9625-73ab82f99ac1">https://gbif.org/dataset/397b0ae4-460e-4680-9625-73ab82f99ac1</a>. Formatted as a Frictionless Data package
Linked collectors and determiners for: Epiphytic mosses from the northwest Iberian quadrant (Spain).
No full textNatural history specimen data linked to collectors and determiners held within, "Epiphytic mosses from the northwest Iberian quadrant (Spain)". Claims or attributions were made on Bionomia by volunteer Scribes, <a href="http://bionomia.net/dataset/ac3508f8-6b4f-4680-9df7-3f4210abd7ef">https://bionomia.net/dataset/ac3508f8-6b4f-4680-9df7-3f4210abd7ef</a> using specimen data from the dataset aggregated by the Global Biodiversity Information Facility, <a href="https://gbif.org/dataset/ac3508f8-6b4f-4680-9df7-3f4210abd7ef">https://gbif.org/dataset/ac3508f8-6b4f-4680-9df7-3f4210abd7ef</a>. Formatted as a Frictionless Data package
Linked collectors and determiners for: Colecção do Herbário da Universidade Eduardo Mondlane.
No full textNatural history specimen data linked to collectors and determiners held within, "Colecção do Herbário da Universidade Eduardo Mondlane". Claims or attributions were made on Bionomia by volunteer Scribes, <a href="http://bionomia.net/dataset/397b0ae4-460e-4680-9625-73ab82f99ac1">https://bionomia.net/dataset/397b0ae4-460e-4680-9625-73ab82f99ac1</a> using specimen data from the dataset aggregated by the Global Biodiversity Information Facility, <a href="https://gbif.org/dataset/397b0ae4-460e-4680-9625-73ab82f99ac1">https://gbif.org/dataset/397b0ae4-460e-4680-9625-73ab82f99ac1</a>. Formatted as a Frictionless Data package
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
Contrasting a BYD Blade prismatic cell and Tesla 4680 cylindrical cell with a teardown analysis of design and performance
No full textIn order to provide design guidance for the development of next-generation batteries, this article presents a teardown analysis of two commercial lithium-ion batteries: the Tesla 4680 cell and the BYD Blade cell. Insights into these cells' electrical, mechanical, material, and process designs are provided. The BYD Blade cell displays half the energy losses per volume of the Tesla 4680 cell at the same C-rate. The Tesla 4680 cell utilizes laser welding, and the BYD Blade cell utilizes laser and ultrasonic welding as electrode contacting technologies. Lithium iron phosphate (LFP; BYD Blade cell) and NMC811 (Tesla 4680 cell) are confirmed as electrode materials resulting in energy densities of 160 Wh/kg and 355.26 Wh/l and 241.01 Wh/kg and 643.3 Wh/l, respectively, on the cell level. Both cells utilize graphite anodes without silicon dioxide. Polyacrylic acid (PAA) and polyethylene oxide (PEO) are detected as binders on the anode side for the Tesla 4680 cell. A manufacturing sequence is proposed for both cells.6
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
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