1,720,974 research outputs found
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
Odd oxygen photochemistry of Martian atmosphere and the role of dust
No full textInternational audienceThough the photochemistry of Mars is comparatively simple, the orbital properties of Mars and its exposure to solar influx lead to pronounced seasonal and latitudinal variations of short lived species (trace gases). In a recent analysis of SPICAM observations in the UV, we have studied spatio-temporal variability of ozone. We further use the photochemistry coupled LMD GCM to study in detail the important source and sink processes of odd oxygen Ox (ozone and oxygen atoms) and their contribution in different locations and seasons. Ox is in photochemical equilibrium up to about 30 km in the aphelion season and up to 45 km in the perihelion season. In the photochemical equilibrium domain, HO+O is the dominant loss process of Ox, while above this domain, the HO+O, H+O and O+O reactions have comparable contributions to the Ox loss. From SPICAM observations, we have found a correlation of ozone with dust. In southern tropical latitudes, the columnar ozone is seen to increase during a global dust storm year (MY 28) compared to the ozone column values during a year without global dust storm (MY 27). This indicates towards the radiative impact of dust on ozone. We have also studied the role of heterogeneous chemistry on dust in determining production of ozone and related tracers, by a 1D photochemical model developed at PRL and the LMD GCM. The sensitivity of input parameters taken by us in the study of heterogenous chemistry such as sticking coefficients, was also analysed
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
Competing pathways in odd oxygen photochemistry of the martian atmosphere
No full textInternational audienceThough the photochemistry of Mars is comparatively simple, the orbital properties of Mars and its exposure to solar influx lead to pronounced seasonal and latitudinal variations of short lived species (trace gases). We have a fair understanding of such species, such as ozone, that determine the equilibrium state of the Martian atmosphere. However, in previous studies a quantitative comparison between various production and loss processes, with their relative importance in determining the abundance of trace species, has not been performed. Here we use the photochemistry coupled LMD GCM to study in detail the important source and sink processes of odd oxygen (ozone and oxygen atoms) and their contribution in different locations and seasons. This becomes especially important due to the high seasonal variability of water vapor involved in the photochemistry. The study shows few interesting features about the processes. The loss due to OH peaks above 50 km irrespective of season but the peak value increases during perihelion season due to increased availability of water vapor in the heights. Contrary to expectations, the day time loss rates due to HO2, which is the most significant loss of odd oxygen do not show a strong seasonal variation. Ox is in photochemical equilibrium up to about 30 km in the aphelion season and up to 45 km in the perihelion season. In the photochemical equilibrium domain, HO2+O is the dominant loss process of Ox, while above this domain, the HOx + O, H + O3 and O + O reactions have comparable contributions to the Ox loss. The O + O3 reaction is always a minor contribution to the Ox loss
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
Odd oxygen photochemistry of Martian atmosphere and the role of dust
No full textInternational audienceThough the photochemistry of Mars is comparatively simple, the orbital properties of Mars and its exposure to solar influx lead to pronounced seasonal and latitudinal variations of short lived species (trace gases). In a recent analysis of SPICAM observations in the UV, we have studied spatio-temporal variability of ozone. We further use the photochemistry coupled LMD GCM to study in detail the important source and sink processes of odd oxygen Ox (ozone and oxygen atoms) and their contribution in different locations and seasons. Ox is in photochemical equilibrium up to about 30 km in the aphelion season and up to 45 km in the perihelion season. In the photochemical equilibrium domain, HO+O is the dominant loss process of Ox, while above this domain, the HO+O, H+O and O+O reactions have comparable contributions to the Ox loss. From SPICAM observations, we have found a correlation of ozone with dust. In southern tropical latitudes, the columnar ozone is seen to increase during a global dust storm year (MY 28) compared to the ozone column values during a year without global dust storm (MY 27). This indicates towards the radiative impact of dust on ozone. We have also studied the role of heterogeneous chemistry on dust in determining production of ozone and related tracers, by a 1D photochemical model developed at PRL and the LMD GCM. The sensitivity of input parameters taken by us in the study of heterogenous chemistry such as sticking coefficients, was also analysed
- …
