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Relative Flux Measurements of Biogenic Methane and Natural Gas for Seven U.S. Cities
No full textThis dataset contains the aircraft data relevant to the manuscript titled: Relative Flux Measurements of Biogenic Methane and Natural Gas for Seven U.S. Cities.
While this dataset is publically available, if you intend to use it for anything, please contact the creators. It is possible that there may be an updated version. The authors request that appropriate citations and coauthorships be honored for the use of this dataset
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Airborne Methane Flux Quantification and Source Identification Using High Resolution Measurements of Ethane and Methane
No full textThe work presented herein demonstrates the use of high resolution trace gas measurements of methane CH4and ethane C2H6 to quantify CH4 fluxes and attribute them to specific sources. In The North Slope of Alaska we were able to make measurements of the total CH4 flux from The Prudhoe Bay Oil Field (PBOF) by separating its emissions from the trace gas signature of surrounding methanogenic metabolism within the Arctic permafrost. We found that the total emissions of CH4 were 1500 [1151, 1888] kg CH4 hr-1 and that the available bottom-up estimates were low by a factor of 2-5. Our estimates of CH4 flux from PBOF are the first such estimates made using a top-down measurement approach. After then developing an C2H6 spectrometer capable of making, what we believe to be, one of the world’s most precise airborne C2H6 measurements from a compact laser absorption spectrometer, we deployed our instrument package to a host of urban areas and characterized their CH4 emission profiles. We were able to partition sources of natural gas from the total CH4 enhancement observed downwind of a city using the ratio of CH4 to C2H6 in urban natural gas. We developed methodologies to subtract the signal of upwind CH4 sources from the downwind enhancements and quantify the contribution from only the domains of interest. Our work in the urban sector shows that the total CH4 flux from an individual city can be dominated by sources of both biogenic (landfills, waste water, ect..) and thermogenic (natural gas) origin and that the emission profile has a strong seasonal dependence with thermogenic sources emitting a larger fraction of the total CH4 flux in the winter months. A comparison of our results to currently available inventory products also show that sources within the urban domain are poorly understood and require significant further study.Earth and Planetary Science
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
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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