Search results for "geography."
showing 10 items of 11308 documents
First report on the helminthfauna of the yellow-necked mouse, Apodemus flavicollis, in the Iberian Peninsula
2016
Summary Information about the prevalence of helminth parasites of the yellow-necked mouse, Apodemus flavicollis, in the Iberian Peninsula is almost non-existent and there is no reliable data reported from Spain. Fourteen A. flavicollis from the Erro River valley (Navarre, Spain) were examined for endoparasites, between February 2001 and July 2002. Thirteen specimens (92.9 %) of the total sample were parasitized by at least one of the following six helminth species: one trematode (Corrigia vitta), one cestode (Taenia parva larvae) and four nematodes (Trichuris muris, Calodium hepaticum, Heligmosomoides polygyrus and Syphacia stroma). This is the first report about the helminthfauna of A. fla…
The role of personal and relative job performance in promotion decisions
2021
This study employs personnel data from a large university to examine how supervisors utilize information on employees' job performance in promotion decisions. The study shows that better-performing employees are rewarded with promotions as a higher output of peer-reviewed publications and better quality of research output are associated with a higher probability of being promoted. The study also shows that supervisors compare their subordinates' job performance when deciding on promotions: employees who outperform their colleagues in terms of research output and research quality are more likely to be promoted. Subsequently, the study provides evidence to support the key premise of the tourn…
Systems Approaches in the Enterprise Architecture Field of Research: A Systematic Literature Review
2018
This study explores the use of the systems approaches (systems thinking and systems theories) as the theoretical underpinnings for Enterprise Architecture (EA) research. Both the academic and the practitioner communities have maintained an interest in EA due to its potential benefits, promising for the recent technological and business advances. EA as a research area is, however, characterized by diversified views depicted in different definitions of the concept, and no acknowledged common theoretical foundation. A number of prior studies have noticed this gap in the EA field of research, and called for a strengthening of the theory of EA. Variegated systems approaches have been suggested a…
Mise en évidence d'un Sénonien gypseux sous la série phosphatée du bassin des Ouled Abdoun: un nouveau point de départ pour l'origine des zones déran…
2013
In the Ouled Abdoun sedimentary basin (Morocco), the phosphatic series is composed of regular interbedded phosphatic and marly limestone layers. Exploitation of the phosphate in some deposits in this basin collides frequently with problems bound to the existence, in the phosphatic series, of disturbed areas (sterile bodies) qualified as derangements by the mining engineers of the Office Cherifian Phosphate Group (OCP). Their presence in the phosphatic layers causes two kinds of problems: (1) since the whole phosphatic sequence is overlain by a Quaternary cover, we do not know their volume proportion in the phosphatic layers, and therefore the reserves estimations can be wrong (2) they are g…
The importance of phytoplankton production for carbon budgets in a semiarid floodplain wetland
2011
Phytoplankton production (PP) in wetlands is not measured as often as that of macrophytes. A three year-study during a period of sustained high flooding was undertaken in a central Spanish floodplain wetland (Las Tablas de Daimiel National Park) to determine net PP, its spatial heterogeneity and controlling factors, and compare it with primary production in macrophyte communities. This enabled us to estimate carbon budgets for each community. All PP variables showed high spatial and temporal variability among sites, resulting in low coherence even when flooding connected all sites. Net PP corresponded to 25- 36% of submerged plant production and 3-10% of helophyte production. Net PP was con…
Expansión urbana del Área Metropolitana de Valencia en el periodo 1984-2011 a partir de imágenes Landsat TM y ETM+
2015
La expansión urbana acelerada producida en décadas recientes en las grandes áreas metropolitanas como Valencia conlleva importantes impactos ambientales, entre ellos la impermeabilización o "sellado antropogénico" del suelo y la pérdida de espacios naturales de gran valor paisajístico. Este trabajo analiza la evolución de la cobertura artificial en el Área Metropolitana de Valencia (AMV) en el periodo 1984-2011 a partir de imágenes Landsat TM y ETM+, validadas a partir de datos SIOSE de mayor resolución espacial. Los resultados muestran, con una precisión del 71%, un aumento de la superficie artificial en el AMV de 8000 ha en dicho periodo, lo que supone un incremento del 10% del suelo sell…
Le territoire : comment observer un système complexe
2008
Ce livre présente une approche simple du concept de territoire, assimilé à un système au sein duquel différents acteurs interagissent en relation avec l'espace géographique. Il fournit les outils conceptuels et méthodologiques pour appréhender le fonctionnement des territoires, en reformulant leur structuration progressive afin de permettre leur observation. L'objectif de ce livre est de faciliter l'approche et la compréhension des territoires dans une perspective systémique moderne.
Territorial Identity and Geographical Mobility Projects.
2007
International audience; Presently, geographical mobility strongly influences professional insertion. Although, when we ask pupils from rural environments about their future life and work environments, they appear to prefer countryside in their present life region and to be strongly reluctant to live in a big city, and even more in a foreign country. It makes wondering about the possibilities: precocious entry in the local labour market or migration towards more qualified jobs. Many factors can affect these future choices: what is the part of the origin family socioprofessional environment, the personal history of these young people who are or not from the region where they presently live, t…
Une approche multi-espèces pour estimer l'impact écologique de la croissance urbaine
2013
National audience
Simulation de scénarios d’urbanisation pour estimer l’impact écologique du développement résidentiel et des évolutions de trafic associées
2015
National audience; La maîtrise de l’étalement urbain repré¬sente actuellement une préoccupation ma¬jeure en aménagement face au nombre im¬portant de nuisances induites par le phénomène. Sur le plan paysager, la croissance des villes se produit aux dépens des milieux naturels et agricoles, ce qui contribue à la fragmentation et à la réduction des habitats de la faune sauvage. Il est donc souhaitable de trouver un compromis entre les implantations résidentielles et la connectivité des habitats écologiques afin d’assurer la durabilité des populations animales. La recherche de ce compromis suppose une concertation entre les différents acteurs de l’aménagement du territoire et de l’environnement…