117,640 research outputs found
Una nova localitat catalana de Lycophotia molothina occidentalis Bellier, 1860
No full textS`esmenta la troballa a la Catalunya central (comarca de l`Anoia) del Noctuidae Lycophotia molothina occidentalis Bellier, 1860, fins ara sols conegut del nord-est de la regió.S`esmenta la troballa a la Catalunya central (comarca de l`Anoia) del Noctuidae Lycophotia molothina occidentalis Bellier, 1860, fins ara sols conegut del nord-est de la regió.Découverte dans le centre de la Catalogne (région de l’Anoia) du Noctuidae Lycophotia molothina occidentalis Bellier, 1860, connu jusqu’à présent seulement du nord-est de la région. Paraules-clau / Mots-clés. — Lepidoptera, Noctuidae, Lycophotia molothina occidentalis Bellier, 1860, Catalunya.S`esmenta la troballa a la Catalunya central (comarca de l`Anoia) del Noctuidae Lycophotia molothina occidentalis Bellier, 1860, fins ara sols conegut del nord-est de la regió
[Leçons de géométrie analytique : précédées des éléments de la trigonométrie rectiligne et sphérique].
No full textTít. tomado de p.1Fecha tomada de p.ISignaturizadoLas h. de grab. pleg.:"Librairie de L. Hachette. Bellier imp. Gravé par Duran
Montée en compétences et accompagnement des professionnels aux enjeux de l’IA
No full textTable ronde professionnelle modérée par Véronique Stoll, directrice de la Bibliothèque de l’Observatoire, avec la participation de :
- Luc Bellier, directeur adjoint, responsable Pôle Numérique, recherche et Science Ouverte DiBISO - direction des bibliothèques, Université Paris-Saclay
- Isabelle Blanc, chargée de la politique des données au ministère de l\u27enseignement supérieur et de la Recherch
Analyses of the stress field in southeastern France from earthquake focal mechanisms
No full textDue to the apparent deformation field heterogeneity, the stress regimes around the Provence block, from the fronts of the Massif Central and Alpine range up to the Ligurian Sea, were not well defined. To improve the understanding of the SE France stress field, we determine new earthquake focal mechanisms and we compute the present-day stress states by inversion of the 89 available focal mechanisms around the Provence domain, including the 17 new ones calculated in the current study. This study provides evidence of 6 different deformation domains around the Provence block with different tectonic regimes. On a regional scale, we identify three zones characterised by significantly different stress regimes: a western one affected by an extensional stress (normal faulting) regime, a southeastern one characterised by a compressional stress (reverse to strike-slip faulting) regime with NNW- to WNW-trending σ1 and a northeastern one, i.e., the Digne nappe front, marked by an NE-trending compression. Note that the Digne nappe back domain is controlled by an extensional regime that is deforming the western alpine core. This extensional regime could be a response to buoyancy forces related to the Alpine high topography. The stress regimes in the southeast of the Argentera Massif and around the Durance fault are consistent with a coherent NNW-trending σ1 that implies a left-lateral component of the active reverse oblique-slip of the Moyenne Durance Fault. In the Rhone Valley, an E-trending extension characterises the tectonic regime that implies a normal component of the present-day Nîmes fault displacement.
This study provides evidence for short-scale variation of the stress states that reflect abrupt change in the boundary force influences on upper crustal fragments (blocks). These spatial stress changes around the Provence block result from the coeval influence of forces applied at both its extremities, i.e., in the north-east, the Alpine front push and in the southeast, the northward African plate drift. Besides these boundary forces, the influence of the mantle plume under the Massif Central can be superimposed along the western block boundary.Published336-348partially_ope
Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe 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
Square Dancing with the Stars to Enhance Dynamic Hirschman Linkages?
No full textIn this Presidential Address, the author takes the reader on a reconnaissance of his life and time as a regional scientist. He points out scenery he found scintillating along the way, hoping that some may pick up the banner and chew on a few of the ideas for a while. He suggests a revisit to Albert O. Hirschman’s notion of key sectors and more empirical analysis related to Marcus Berliant’s and Masahisa Fujita’s notion of knowledge creation and transfer.Presidential Address, San Antonio, Texas, March 29, 2014 (53rd Meetings of the Southern Regional Science Association
Appropriate Similarity Measures for Author Cocitation Analysis
No full textWe 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
Letter from unknown writer to Jesse L. Boyce
No full textLetter to Jesse L. Boyce from unknown author (possibly Jack) about the investigation into the powder magazine located in the Grand Canyon. Some personal news is included in the letter such as the writer's marriage to the daughter of C.A. Taylor, former Supervisor of Cochise County
Dispelling the Myths Behind First-author Citation Counts
No full textWe 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
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