1,720,954 research outputs found
Decarbonization of cement production by electrification
Full text linkThis study presents the techno-economic assessment of four electrified cement plants: i) using direct electrification and plasma technologies (eC-pK case); ii) consisting of indirect electrification via H2 combustion and oxycombustion of alternative fuels (OC-HK); iii) combining direct electrification, alternative fuels combustion and post-combustion CO2 capture (eC-afK); iv) consisting in the electrification of the hydraulic Calcium Hydro Silicate production process (e-hCHS). Process modeling in Aspen Plus is used to estimate mass and energy balances and calculate techno-economic key performance indicators. The study finds that all the electrified alternatives achieve high levels of equivalent CO2 emissions avoidance (87.2%-101.8%), with a trade-off between the electricity demand (604-1341 kWh/tclk) and the amount of captured CO2 to be handled by the transport & storage infrastructure (357-834 kgCO2/tclk). With an electricity price of 50 euro/MWh, the partially electrified alternatives (OC-HK, eC-afK) showed competitive additional cost of clinker (87 euro/tclk) and cost of avoided CO2 (101 euro/tCO2) against a benchmark case, though higher than the cost of the best CO2 capture technologies from the literature. The eC-pK case resulted in lower economic performance associated mainly to the higher price of electricity per unit of final energy supplied compared to alternative fuels
Decarbonization of Methanol, Ammonia and Olefins production in the EU
No full textLAUREA MAGISTRALEL'industria chimica svolge un ruolo cruciale nell'economia globale, ma è anche uno dei maggiori contributori alle emissioni di gas serra. Questa tesi si concentra sulle strategie di decarbonizzazione per tre dei processi più energivori nell'industria chimica: produzione di ammoniaca, metanolo e olefine nell'Unione Europea. Lo studio valuta le attuali tecnologie di produzione ed esamina percorsi alternativi che possono ridurre significativamente le emissioni di carbonio, tra cui l'elettrificazione, la cattura e lo stoccaggio del carbonio (CCS) e l'uso di idrogeno verde. Viene eseguita un'analisi tecnica per valutare la fattibilità e la scalabilità di queste tecnologie di decarbonizzazione nel contesto dell'UE, adottando un processo di riferimento basato sui documenti delle migliori tecniche disponibili definiti dalla Commissione Europea e supportando la ricerca. I risultati evidenziano il potenziale degli approcci integrati che combinano fonti di energia verde con modifiche di processo innovative, che possono ottenere sostanziali riduzioni delle emissioni. Lo studio si conclude con raccomandazioni per gli stakeholder del settore e i decisori politici per accelerare la transizione verso un'industria chimica a basse emissioni di carbonio in Europa.The chemical industry plays a crucial role in the global economy, but it is also one of the largest contributors to greenhouse gas emissions. This thesis focuses on the Decarbonization Strategies for three of the most energy-intensive processes in the chemical industry – Ammonia, Methanol, and Olefins production in the European Union. The study evaluates current production technologies and examines alternative pathways that can significantly reduce carbon emissions, including electrification, carbon capture and storage (CCS), and the use of green hydrogen. A technical analysis is performed to assess the feasibility and scalability of these decarbonization technologies within the EU context, taking a reference process based on Best Available Techniques documents defined by the European Commission as well as supporting research. The results highlight the potential of integrated approaches combining green energy sources with innovative process modifications, which can achieve substantial emission reductions. The study concludes with recommendations for industry stakeholders and policymakers to accelerate the transition toward a low-carbon chemical industry in Europe
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
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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