1,720,955 research outputs found
Towards CO2 emissions reduction of shipping: Ca(OH)2 based carbon capture system for safeguarding the marine environment
Full text linkClimate change poses a global challenge related to the reduction of pollutant atmospheric emissions and the maritime transportation sector is directly involved, due to its significant impact on the production of Greenhouse Gases and other substances. While established technologies have effectively targeted emissions like Nitrogen Oxides (NOX) and Sulfur Oxides (SOX), the persistence of Carbon dioxide (CO2) emissions represents an ongoing and significant concern. Novel technologies targeting CO2 reduction have been lately studied and proposed for inland applications, and are now being developed for maritime applications. With this regard, the present study explores the potential of Carbon Capture Systems (CCS) to mitigate CO2 emissions produced by cargo ships. While the implementation of CCS faces challenges, including space limitations and logistical complexities, its possible integration onboard marks a significant step in the fight against climate change. The authors propose an innovative approach using a Calcium Hydroxide Ca(OH)2 based CCS, offering the dual benefit of CO2 reduction and the potential resolution of ocean acidification through Calcium carbonate (CaCO3), the final product resulting from the CO2 capture process. Additionally, the study examines the feasibility of the generated product for reuse in industry, promoting a circular economy and addressing environmental issues. This innovative solution underscores the urgent need for transformative measures to reduce maritime emissions, in line with efforts to safeguarding the marine environment and combat climate change
Feasibility Assessment for the Application of Carbon Capture Systems Onboard Cargo Ships in Response to the EU ETS Regulation
No full textThe role of the maritime industry in reducing greenhouse gas (GHG) emissions to mitigate the effects of global warming is significant. The International Maritime Organization (IMO) has set a specific target for the industry, but the challenge is to implement emission-reducing technologies at scale. The use of fossil fuels is still dominant in the shipping sector, also due to the significant barriers that hinder the full adoption of carbon-neutral alternative fuels. The transition to a low-carbon economy presents an opportunity for the industry to lead the way towards a sustainable innovation and demonstrate a commitment to reducing its environmental impact. In this context, Carbon Capture System (CCS) technologies have been identified as a promising solution, but their implementation on ships comes with its own set of challenges. In this paper, the authors aims at exploring the technical requirements and consequences of the installation of a CCS based on the use of Calcium Hydroxide (Ca(OH)2) onboard a container ship. To validate their assumptions, the authors set up a simulation tool able to evaluate the potential reduction in Carbon Dioxide (CO2) emissions from the ship along a selected route. On the basis of the tool outcomes, the authors were able to provide a comprehensive analysis of the proposed system's costs and benefits, emphasizing the considerable savings that could be attained through the implementation of this technology on board cargo ships with a specific consideration to the future implementation of carbon emission taxes and a focus on the European Union Emission Trading System (EU ETS) regulation. The findings of this research offer valuable perspectives on creating more effective and environmentally friendly approaches to mitigate GHG in the maritime sector
A fast feasibility tool for the assessment of fuel switch in the concept design of merchant ships
Full text linkDue to the utmost importance of international maritime transport within the global economy, shipping contributes substantially to the emission of pollutants and Greenhouse Gases. Consequently, it is called to reduce its environmental impact, in accordance with the regulations that will enter into force in the next years. In this framework, innovative technologies can find fruitful applications in new constructions, but there is still a significant number of operating ships that needs to be technologically updated. Nonetheless, since these ships may be already in the middle of their service life, revamping operations must take into account the purpose of both reducing pollution and avoiding long and expensive interventions. The sustainability-oriented production is one of the most discussed topics and in this paper, the authors aim at describing the potential technologies and solutions to adapt operating ships to the future emission threshold limits. Then, they propose a tool for supporting energy conversion studies on ships. The tool was tested on an Oil Tanker selected as a case study; different layouts exploiting the use of liquefied natural gas, ammonia, and methanol as alternative fuels were analysed. The considered technological solutions were compared on the basis of both technical and economic aspects. Indeed, technological feasibility and economic viability represent the most important discriminants for the diffusion of such innovations on a wide scale and in particular for commercial vessels employed predominantly in long and international voyages
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
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