1,721,219 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
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
Use of remote sensing for irrigated viticulture caracterization in the climate change context : application over the vineyards of Mendoza, Argentina
No full textEn contexte de changement global, les questions d’adaptation et de pérennisation des systèmes de production sont un enjeu agricole majeur. En Argentine, le 5ème producteur mondial de vins, les conditions thermiques et hydriques sont déjà proches des limites de la culture de la vigne. En tant que culture pérenne, son adaptation à court et moyen termes doit être pensée, dès à présent. La pérennisation de cette culture passe par une adaptation des pratiques culturales. L’objectif de cette thèse visait à proposer des outils de détection et de gestion des pratiques culturales des vignobles à partir d’imagessatellitaires optiques et radar. Une analyse préalable des évolutions du climat et de sa variabilité intrarégionale a mis en évidence les principales menaces et opportunités au regard du changement climatique. A l’échelle locale, le travail sur un grand nombre de parcelles aux caractéristiques hétérogènes a approfondi les connaissances sur l’interaction signal cible en fonction des pratiques culturales. Des cartographies de l’orientation des rangées de vignes, des surfaces protégées par des filets anti-grêles et des modes d’irrigation ont été réalisées afin de dresser un état des lieux du système viticole actuel. Ensuite, l’évaluation du potentiel des données satellitaires pour le suivi de la croissance de la vigne et de ses besoins en eau ont apporté des résultats prometteurs pour le développement d’outils d’aide à la décision pour les viticulteurs.In the climate change context, the adaptation and sustainability of agricultural systems is a major challenge. In Argentina, the 5th worldwide wine producing country, the thermal and hydrical conditions are already extreme for grapevine production. This perennial crop sustainability depends on the adaptation of cultural practices. The objective of the thesis was to develop tools for helping in cultural pratices management using optical and SAR remote sensing images. First, an analysis of climate evolution and its inner regional variability hilighted the main threats and opportunities in the climate change context. At the local scale, working on a high number of heterogeneous vineyards improved the knowledge about signal and target interaction depending on cultural practices. Maps of row orientation, areas protected by anti-hail nets and irrigation systems were produced for an inventory of the actual viticultural system conditions. Then, the potential of remote sensing data for grapevine growth monitoring and irrigation requirements was evaluated and led to promising preliminary results for developping irrigation monitoring tools destinated to grapevine producer
Evaluation of high spatial and temporal resolution satellite images for land use monitoring in irrigated agricultural areas : application to the Berambadi watershed in India
No full textL'agriculture est l'épine dorsale de l'économie indienne et l'Inde utilise une part importante de l'eau douce disponible pour l'irrigation. Après la révolution verte qui a eu lieu dans les années 1960, le secteur agricole indien a connu une croissance exponentielle qui a entraîné une surexploitation de l'eau douce à des fins d'irrigation. L'objectif principal de cette thèse est d'effectuer un suivi des cultures et des terres cultivées irriguées dans le bassin hydrographique expérimental du Berambadi à l'aide de séries temporelles d'images satellite optiques et radar. L'évolution des terres cultivées irriguées dans le bassin versant au cours de trois décennies a été étudiée à l'aide d'indices dérivés des images optiques et l'identification et la caractérisation des terres irriguées ont été effectuées avec des séries temporelles optiques et radar. Les résultats montrent la pertinence de l'utilisation de plusieurs produits satellitaires optiques par temps nuageux pour la surveillance saisonnière des terres cultivées irriguées. Ils soulignent également le potentiel de la synergie entre les séries d'images polarimétrique SAR Radarsat-2 et les séries d'images optiques pour le suivi de la croissance des cultures. Cette recherche démontre que l'augmentation intensive de l'irrigation dans le bassin versant de Berambadi au fil des décennies a fait disparaître les eaux de surface dans les parties avales. L'irrigation intensive des cultures par les eaux souterraines pendant trois saisons par an entraîne l'arrêt de l'écoulement de surface dans le bassin versant, les eaux souterraines étant épuisées jusqu'à 50 m de la surface.Agriculture is the backbone of India's economy and India uses a significant proportion of the fresh water available for irrigation. After the Green Revolution in the 1960s, India's agricultural sector grew exponentially, resulting in the overexploitation of fresh water for irrigation purposes. The main objective of this thesis is to monitor irrigated crops and cropland in the experimental Berambadi watershed using optical and radar satellite image time-series. The evolution of irrigated cropland in the watershed over three decades was studied using indices derived from optical images and the identification and characterization of irrigated land were carried out using optical and radar time-series. The results show the relevance of using several optical satellite products in cloudy weather for seasonal monitoring of irrigated cropland. They also highlight the potential of synergy between SAR Radarsat-2 polarimetric and optical image time-series for monitoring crop growth. This research shows that the intensive increase in irrigation in the Berambadi watershed over the decades has caused surface water in the downstream areas to disappear. Intensive irrigation of crops with groundwater for three seasons per year results in the cessation of surface runoff in the catchment area, with groundwater being depleted to 50 m from the surface
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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