1,721,010 research outputs found
Genetic diversity of Dalbergia melanoxylon Guill. & Perr. populations in the Ferlo zone (Senegal) using nuclear and chloroplast microsatellite markers
No full textBiodiversité, restauration écologique et intensification écologique : quelles imbrications ?
No full textLa biodiversité est un concept global qui sous-entend la variété et la variabilité du monde vivant à tous ses niveaux d’organisation, du gène à l’écosystème. Il apparait aujourd’hui que les écosystèmes de la terre ont été transformés de manière significative par les activités humaines, avec comme corollaire une menace permanente sur la diversité biologique. La fragmentation des écosystèmes naturels tels que les forêts a un impact certain sur le rapprochement entre l’homme et les animaux sauvages avec comme corollaire la prolifération des zoonoses. Cette érosion de la biodiversité est devenue un problème mondial, tant du point de vue écologique, socio-économique que sanitaire, et questionne les modes de développement des activités humaines. Pour réduire ou annihiler le processus de dégradation des écosystèmes naturels, la restauration écologique, définie comme toute action intentionnelle visant l’autoréparation des écosystèmes dégradés, a connu un essor dans le monde. Ce concept a une parenté épistémologique avec la notion d’intensification écologique définie comme un processus de transformation des écosystèmes productifs qui doit se réaliser dans le cadre de toutes les limites de viabilité d’un écosystème donné. Ainsi, il apparait aujourd’hui nécessaire, pour sauver la planète des dérives de l’agriculture conventionnelle productiviste, de faire la promotion de l’intensification écologique de l’agriculture et de la restauration écologique des écosystèmes dégradés.Biodiversity is a global concept that implies the variety and variability of the living being at all levels of organization, from the gene to the ecosystem. It now appears that the Earth's ecosystems have been significantly transformed by human activities, resulting in a permanent threat to biodiversity. The fragmentation of natural ecosystems such as forests has a definite impact on the relationship between man and wild animals, leading to the proliferation of zoonoses. This erosion of biodiversity has become a global problem from an ecological, socio-economic and health point of view, which questions the modes of development of human activities. To reduce or annihilate the degradation process of natural ecosystems, ecological restoration, defined as an intentional action aimed at the self-healing of degraded ecosystems, has flourished around the world. This concept has an epistemological kinship with the notion of ecological intensification defined as a process of transformation of productive ecosystems that must be realized within the limits of all viability of a given ecosystem. Thus, it appears necessary today, to save the planet from the excesses of conventional agriculture, to promote the ecological intensification of agriculture and the ecological restoration of degraded ecosystems
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
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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