1,720,969 research outputs found
Quantifying the Petroleumscape: Using a stock driven Material Flow Analysis model to assess the possibilities for material circularity in the oil industry
No full textThis study sets out to assess the material based consequences of changes in future oil demand. In doing so, this study aims to quantify the physical, industrial petroleumscape. To achieve this, the evolution of the world’s petroleum infrastructures are modelled based on two SSP2 scenarios; a baseline scenario and a 1.5-degree scenario. This study estimates dynamic embedded materials from 1971 towards 2050, as well as the associated in- and outflow. Based on the end-of-life characteristics of the sector, the model assesses the potential for material circularity within the sector. This study finds that storage and pipelines are the driving stages of material use in the petroleum industry, and that steel and concrete are the most used materials. Furthermore, it shows that changes in oil demand have an immediate effect on the material stock and inflow, but only effect the outflow of material after 2040. To reach material circularity within the petroleum sector a decrease demand is needed to lower the inflow, and end-of-life practices need to be improved, especially the recovery of pipelines after decommissioning and the recycling rate of concrete. Appendix A is omitted from this submission, due to licensing issues. The same goes for the Supplementary Information 1 and 2. If details from either Appendix A or the SI are needed, you can contact the author or first supervisor.Industrial Ecolog
From Smartphone to Futurephone: Assessing the Environmental Impacts of Different Circular Economy Scenarios of a Smartphone Using LCA
No full textThe lack of literature on using life cycle assessment (LCA) for increasing environmental performance raises the need for concepts or eco-design tools to be combined with LCA to answer the question of how to strategize and take actions based on LCA results. This study intends to address this need by using mobile phones as a case study and answering the question: How can the environmental performance of the Fairphone be improved?Master of Science Industrial EcologyEngineering System and ServicesTechnology, Policy and Managemen
Stock-driven scenarios on global material demand: the story of a lifetime
Get PDFThe role of material production as a driver of environmental impacts is increasing, which calls for a better understanding of global material flows. This thesis explores the role of in-use stocks of products, buildings and infrastructure as a key driver of global material demand and discusses the implications with regards to availability of waste flows. The method based on detailed product compositions and lifetimes is applied to generate material use scenario’s towards 2050 for appliances, vehicles, buildings and electricity infrastructure. Under most of the developed scenarios, a growing population and increasing affluence are expected to lead to higher demand for products, and consequentially leads to a continued growth in annual material demand worldwide. While the results can be used to identify sector specific challenges and opportunities for achieving a more circular economy, the method also provides a starting point to incorporate material cycles and resource efficiency strategies more explicitly and consistently in integrated assessment models. This would allow for a more comprehensive assessment of resource use in relation to other global challenges such as climate change.Industrial Ecolog
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
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