1,720,979 research outputs found
Device for measuring concentration of gases
No full textThe invention concerns a device 1) for measuring concentration of gases, particularly trace gases, comprising, within an housing (2) having such reduced dimensions to allow its introduction within a well or a piezometer, very small sized concentration meters, or sensors, for different types of gaseous chemical species and weather parameters, a real time calibration system, after every acquisition, of the different sensors to take into consideration the variations of all the environmental parameters, and a GPS system allowing synchronizing measurements carried out by other measurement devices such as, for example, accelerometers and seismographs
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
Airborne profiles of NO2, total peroxy nitrates and total alkyl nitrates, analysis of forest fire plumes during BORTAS campaign
No full text"Boreal forest fire emissions impact the concentrations and chemistry of nitrogen oxides species locally and across long distance. During the Quantifying the impact of BOReal forest fires on Tropospheric oxidants over the Atlantic using Aircraft and Satellites (BORTAS) campaign (Canada, summer 2011), were carried out several profiles from ground up to 10 km with the BAe-146 aircraft. In those profiles the concentrations of NO2, total peroxy nitrates (∑PNs, ∑RO2NO2), total alkyl nitrates (∑ANs, ∑RONO2) and other compounds (i.e. CO, O3, VOC) were measured. The analysis of the profiles, selecting those effected by Boreal forest fire emissions (CO > 200ppbv), show an increase of ∑PNs (that include PAN) compared with background profiles (CO < 200 ppbv) from 2 to 10 times at altitude between 2 and 4 km, and 6 times above 5 km. The increase of NO2 ranges from 2 and 3.5 and it is peaked at 6 km where the CO shows the highest increase. ∑ANs concentrations in fire plumes is from 2 to 12 times higher than background plumes, from ground to 5 km, above their concentrations growth is less evident. The increases of NO2 and ∑PNs as function of the altitude are matched by the increases of methanol, a VOC emitted by forest fire. Looking at O3 profiles its concentration increase is peaked at 2 km with a factor of 1.2, whereas at higher altitude is negligible. Here will be show possible reasons of the different impact on nitrogen oxides of the boreal forest fire emissions, their different behavior with altitude and the role of the distance from the emission region.
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