1,720,988 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
Arc Valley atmospheric pollution study (Maurienne, Savoie) : New and improved methods for air quality biomonitoring survey using plants
No full textLa Maurienne est soumise à un trafic routier et autoroutier intense qui traverse les Alpes par le tunnel du Fréjus. La pollution atmosphérique associée a été étudiée, au niveau local, à l’aide d’un maillage reposant sur deux approches complémentaires, biologique et chimique. Les propriétés de rétention des particules des aiguilles de Pinus sylvestris, Pinus nigra et Picea abies ont été utilisées pour réaliser un suivi spatio-temporel des émissions. Les dépôts ont été analysés par microscopie électronique à balayage couplée à la spectrométrie de rayons X. L’analyse a porté sur le Phosphore et les traceurs de pollution routière (Al, Ti, Fe). Il a pu être montré que les distances de dispersion particulaires dépassaient 300 m pour les axes routiers et plusieurs kilomètres pour le Phosphore. La pollution primaire azotée émise par les véhicules en circulation a été étudiée avec Molinia caerulea, poacée bioaccumulateur nitrophile. Sa capacité de croissance et d’accumulation de l’azote est liée aux émissions et à la densité du trafic. De plus, la composition isotopique de la Molinie (d15N) dépendant des oxydes d’azote véhiculaires permet d’envisager son utilisation comme bioindicateur. Ces données permettent de mieux comprendre l’impact potentiel du trafic sur les écosystèmes à proximité des grands axes de circulation. L’étude des niveaux et de la répartition de l’ozone troposphérique en vallée de Maurienne a été étudiée en 2004 et 2005 selon des méthodes biologiques et chimiques. Les résultats confirment l’efficacité du matériel biologique (tabac Bel-W3) et des capteurs chimiques dans la détermination des niveaux d'ozone aux basses altitudes. En revanche, une perte de sensibilité a été identifiée dans les conditions spécifiques de montagne qui limitent son utilisation au-dessus de 1000m. Ce travail, à travers différentes approches de la biosurveillance et un maillage dense de stations d’avoir une image réaliste de la pollution atmosphérique dans une vallée de montagne et de ses impacts potentiels sur les écosystèmes forestiers.The Maurienne is subjected to a heavy traffic of lories and cars crossing the Alps through the Frejus tunnel. Atmospheric pollution depending on traffic has been studied using a dense net of biological and chemical sensors. The adhesive properties of plant cuticles of Pinus sylvestris, Pinus nigra and Picea abies were used for spatio-temporal analyses of emitted particles. Elementary composition of deposits was determined using SEM and Xray spectrometry. Analyses were focused on P and traffic tracers (Al, Ti, Fe). Results show that traffic particles can be transported as far as 300 m from the roads and highways while Phosphorus was detected at some kilometers from the factory. The poaceae Molinia caerulea was used for nitrogen pollution study. Leaf growth and nitrogen content were related to NOx levels and traffic density. Moreover, nitrogen isotopic composition (d15N) of leaves depend on exposure to traffic related nitrogen oxides. Taken altogether, results show that Molinia can be used as a nitrogen bioindicator and give information on the potential impact on mountain ecosystems in the vicinity of main roads and motorways. Both biological (tobacco Bel-W3) and chemical methods were used for determination of levels and distribution of tropospheric ozone in the Maurienne valley in 2004 and 2005. Results confirm the usefulness of both biological and chemical approachs for ozone levels determination at low altitudes. However, a sensitivity loss of ozone sensitive tobacco plants in hard mountainous conditions was characterized, limiting its use under 1000 m. This approach by the simultaneous use of several techniques and a dense network of stations give a realistic picture of the atmospheric pollution in a mountain valley and its potential impacts on forest ecosystems
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
Pollution atmosphérique dans la vallée de l'Arc (Maurienne, Savoie). Nouvelles approches en biosurveillance végétale.
No full textLa Maurienne est soumise à un trafic routier et autoroutier intense qui traverse les Alpes par le tunnel de Fréjus. La pollution atmosphérique associée a été étudiée au niveau local à l'aide d'un maillage reposant sur deux approches complémentaires, biologique et chimique.
Les propriétés de rétention des particules des aiguilles de Pinus sylvestris, Pinus nigra et Picea abies ont été utilisées pour réaliser un suivi spatio-temporel des émissions. Les dépôts ont analysés par spectrométrie de rayons X. Notre analyse a porté sur le Phosphore et les traceurs de pollution routière (Al, Ti, Fe). Nous avons pu montrer que les distances de dispersion particulaire dépassent 300 m pour les axes routiers et plusieurs kilomètres pour le phosphore.
La pollution primaire azotée émise par les véhicules en circulation a été étudiée avec la poacée Molinia caerulea, bioaccumulateur nitrophile. Sa capacité de croissance et d'accumulation de l'azote est liée aux émissions et donc au trafic. De plus, la composition isotopique des plants de Molinie (15N) dépend des oxydes d'azote et ces résultats permettent d'envisager son utilisation comme traceur des émissions véhiculaires. Ces données permettent de mieux comprendre l'impact potentiel du trafic sur les écosystèmes à proximité des grands axes de circulation.
L'étude des niveaux et de la répartition de l'ozone troposphérique en vallée de Maurienne réalisée en 2004 et 2005 selon des méthodes biologiques et chimiques a permis de confirmer l'efficacité du matériel biologique (tabac Bel W3) et des capteurs chimiques dans la détermination des niveaux d'ozone aux altitudes basses. Cependant, nous montrons une perte de sensibilité dans les conditions spécifiques de moyenne altitude et un maillage dense de stations d'avoir une image de la pollution atmosphérique dans une vallée de montagne et des ses impacts potentiels sur les écosystèmes forestiers.The Maurienne is subjected to a heavy traffic of lories and cars crossing the Alps by the Frejus tunnel. Atmospheric pollution linked to traffic has been studies using a dense net of biological and chemical sensors.
The properties of plant cuticles of Pinus sylvestris, Pinus nigra and Picea abies were used for spatio-temporal analyses. Deposits were collected and elementary composition was determined by Xray spectrometry. We focused on P and traffic tracers (Al, Ti, Fe). We showed that traffic particles can be detected as far as 300 m from the roads and highways while Phosphorus was detected ast some kilometres from the plant.
The nitrogen pollution was studied using the poaceae Molonia Caerulea. Leaf growth and nitrogen content measurements were related to NOx levels and traffic density. Moreover, nitrogen isotopic composition (d15N) of leaves depended on exposure to nitrogen exides which can be an other tracer for studying traffic impact. Finally, theses results give information on the potential impact on mountain ecosystems in the vicinity of main roads and motorways.
Levels and distribution of tropospheric ozone in Maurienne valley studied in 2004 and 2005 using both biological and chemical methods. Results confirm the usefulness of both biological sennsors (tobacco Bel W3) and chemical sensors for the determinatioon of levels of ozone at low altitudes. However, we characterized a loss of sensitivity of tabacco in hard mountainous conditions,, leading to a decline of sensitivity which limits its use.
This approach by the simultaneous use off several techniques and a dense network of stations give a picture of the atmospheric pollution in a moutain valley and its potential impacts on forest ecosystems
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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