1,720,960 research outputs found
Life cycle assessment of an innovative lithium-ion battery recycling route: A feasibility study
No full textThe number of end-of-life (EoL) lithium-ion batteries (LIBs) has increased worldwide. Yet, current recycling technologies are unoptimized. In this study, a recycling route consisting of LIB dismantling, discharge, cell opening, thermal pretreatment, leaching and precipitation was investigated in a life cycle assessment (LCA) approach. The final goal of the study was to understand the process feasibility, by adopting hotspot and scenario analyses, and economic evaluation as supporting tools. Primary data was used as input for the LCA. Under the base scenario, recycling credits were obtained for the categories of terrestrial toxicity, human non-carcinogenic toxicity, and mineral resource scarcity. Citric acid use was the main contributor to overall impacts in 13 out of 18 impact categories. The analysis of the best-case scenario, which simulated possible improvements during scale-up, resulted in reduced impacts for every impact category as compared to the base scenario. Citric acid reuse was essential for impact mitigation. The improved recycling process (best-case) of 1 battery pack (3.8 kg, 148.5 Wh) led to credits in the categories of mineral resource scarcity (−0.278 ± 0.0105 kg Cu eq), human non-carcinogenic toxicity (−34.3 ± 1.9 kg 1,4-DCB eq), marine ecotoxicity (−3.05 ± 0.204 kg 1,4-DCB eq), freshwater ecotoxicity (−2.46 ± 0.162 kg 1,4-DCB eq), terrestrial ecotoxicity (−178 ± 8.69 kg 1,4-DCB eq), and freshwater eutrophication (−0.00095 ± 0.000154 kg P eq). A preliminary economic evaluation resulted in revenues of €298.59 ± 12.93 and material and energy costs of €97.42 ± 1.95 per battery pack. Anode recovery was profitable
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
Reactive Orange 16 dye degradation in anaerobic and aerobic MBBR coupled with ozonation: addressing pathways and performance
No full textIn this study, two treatment routes were investigated for degradation of the azo dye Reactive Orange 16 (RO16): biodegradation in an anaerobic MBBR (R1) and ozonation followed by biological treatment in an aerobic MBBR (R2). Along with the dye, glucose and nutrients were supplemented to the influent fed to R1 as carbon co-substrate and nitrogen source, respectively. In R1, maximum color removal of 61 ± 18% was achieved for 5 mg l−1 of dye, hydraulic retention time of 12 h and influent COD of 800 mg l−1. Moreover, RO16 biodegradation was limited by carbon source (glucose) and attached solids concentrations. Batch tests revealed that anaerobic biodegradation of the dye and glucose followed second-order kinetics and RO16 degradation constant increased as the initial COD was reduced. Considering the relatively low color removal achieved anaerobically, dye solutions (100 to 500 mg l−1) were ozonated, enabling fast discoloration of at least 97% within 20 min for the highest dye concentration. However, the low COD (50–75%) and TOC (35–40%) removals achieved indicate that only partial mineralization occurred. RO16 (500 mg l−1) ozonation products were identified, and a degradation pathway was proposed. Subsequently, the ozonated solutions were supplemented with glucose and nutrients and fed to R2. COD removal decreased considerably (from 92 to 81%) when ozonated solutions with original dye concentration of 500 mg l−1 were fed to R2, but ammonium removal remained fairly stable. Three compounds identified before biological treatment were not found in R2 effluent, suggesting that they were biodegraded
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
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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