1,721,067 research outputs found
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
Comment by Stuart Haszeldine on Zoback and Gorelick (2012)
No full textThis article by Zoback and Gorelick (PNAS 2012, doi: 10.1073/pnas.1202473109) presents a well argued and fundamental challenge to be proposition that geological storage of CO2 by deep injection of fluid can be an important technology against climate change.
The two authors are experienced and well respected senior professors at Stanford University, USA. The challenge certainly deserves to be heard, considered, and rebutted if possible by CCS proponents.This article by Zoback and Gorelick (PNAS 2012, doi: 10.1073/pnas.1202473109) presents a well argued and fundamental challenge to be proposition that geological storage of CO2 by deep injection of fluid can be an important technology against climate change.
The two authors are experienced and well respected senior professors at Stanford University, USA. The challenge certainly deserves to be heard, considered, and rebutted if possible by CCS proponents
Can CCS and NET enable the continued use of fossil carbon fuels after CoP21?
Full text linkCarbon capture and storage (CCS) does not generate energy. CCS applied to fossil and modern bio-carbon fuels and feedstocks removes environmentally damaging CO2 emissions. CoP21 stipulated a maximum 2°C–1.5°C global warming from 2050 in perpetuity. Both CCS and negative emission technology (NET) are now required to manage the carbon stock in earth’s atmosphere and oceans. All components of CCS are operationally proven secure at the industrial scale. Fifteen CCS projects operate globally; seven are under construction. CCS systems increase electricity prices, to about £100/MWhr. CCS on industry is cheaper and storage costs minimal (£5–20/tonne). CCS reduces whole economy costs of carbon transition by 2.5 times. Policies of capex subsidy, oversupplied emissions certificates, weak carbon pricing, and weak emissions standards have all failed to develop large cost CCS mega-projects. New carbon certificates could link the extraction of carbon to an obligation to store a percentage of emissions. Certificates connect CCS and NET pathways to secure carbon storage for the public good
Carbon capture and storage: UK's fourth energy pillar, or broken bridge?
Full text linkCCS power is the only way to burn fossil fuel with lower emissions, and will be essential to fill in electricity generation gaps on weeks when wind does not blow across the EU. CCS is part of the UK plan for a low carbon future, but is progressing too slowly, to be commercially proven when needed. The UK is uniquely advantaged to exploit CCS, with interest from power, transport, and storage companies. Our group has made a comprehensive first evaluation of offshore UK storage, showing that 100 years of not just UK, but also European CO2, could be stored profitably. If this business charged pore space fees, that could be a revenue of £5Bn per year just from storage. Pilot injection could start immediately, and is a needed to solve longer-term capacity uncertainties.Mike Stephenson (BGS) and Stuart Haszeldine (University of Edinburgh) were speaking at the "Carbon capture and storage in the north sea: a national asset in a low carbon future" session at the 2009 British Science Festival in Guildford.
Talk short summary: CCS power is the only way to burn fossil fuel with lower emissions, and will be essential to fill in electricity generation gaps on weeks when wind does not blow across the EU. CCS is part of the UK plan for a low carbon future, but is progressing too slowly, to be commercially proven when needed. The UK is uniquely advantaged to exploit CCS, with interest from power, transport, and storage companies. Our group has made a comprehensive first evaluation of offshore UK storage, showing that 100 years of not just UK, but also European CO2, could be stored profitably. If this business charged pore space fees, that could be a revenue of £5Bn per year just from storage. Pilot injection could start immediately, and is a needed to solve longer-term capacity uncertainties
Supplementary Evidence: Climate Change Plan Update
Full text linkSupplementary evidence submitted to the Scottish Parliament Economy, Energy and Fair Work Committee by Stuart Haszeldine, Director of SCCS, and Professor of Carbon Capture and Storage at the School of GeoSciences, University of Edinburgh.Supplementary evidence submitted to the Scottish Parliament Economy, Energy and Fair Work Committee by Stuart Haszeldine, Director of SCCS, and Professor of Carbon Capture and Storage at the School of GeoSciences, University of Edinburgh
Pipeline infrastructure for CO₂ transport in Europe
No full textPresentation on Europe-wide CO2 Infrastructures Feasibility StudyPresentation on Europe-wide CO2 Infrastructures Feasibility Stud
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
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