Suchergebnisse

In the last decade, forestry policies in Spain have undergone changes needed to comply with the European and world directives on forest conservation. The elaboration of strategic plans has to take into account the State organization (Central and Autonomous Regional Governments share the responsibilities), resulting in agreed documents, effective at a national level and fulfilling the peculiarities and aspirations of each region. The most recent development has been the elaboration of a Strategy for Conservation and Sustainable Use of Forest Genetic Resources, which can be seen as a consequence of, among other factors, the implementation of the Spanish Strategy for Conservation and Sustainable Use of Biodiversity along with Spain's participation in the European Forest Genetic Resources Programme. This document arose from the lack of approaches to the conservation of population diversity of forest species in the current policies, and as a means to promote and coordinate activities on conservation and use of genetic resources. The Strategy has been arranged through a participative process involving the ForestAdministration, Research Centres and Universities. The document includes a definition of priorities and proposals of activities, which are mainly focused on optimising the efficiency of existing tools and infrastructures and on increasing synergy among different initiatives. Implementation of the Strategy is expected to occur through the development of National Action Plans. Finally, coordination mechanisms must be enhanced in order to maintain the levels of cooperation achieved during the elaboration process. ; Durante la última década se han producido importantes cambios en la política forestal española relacionados con la adaptación a las directivas tanto europeas como internacionales en materia de conservación de bosques. La elaboración de planes estratégicos tiene que tener en cuenta la organización del Estado donde Gobierno Central y Comunidades Autónomas comparten responsabilidades. Los documentos generados tienen que resultar efectivos a nivel nacional pero también atender a las necesidades y aspiraciones de cada región. Recientemente se ha elaborado la Estrategia Española para la Conservación y Uso Sostenible de los Recursos Genéticos Forestales, que puede contemplarse como consecuencia, entre otros factores, del desarrollo de la Estrategia Española para la Conservación y el Uso Sostenible de la Biodiversidad, junto con la participación española en el Programa Europeo de Recursos Genéticos Forestales. La Estrategia surge como consecuencia de la carencia de iniciativas para la conservación de la diversidad de las poblaciones de especies forestales en las recientes políticas del sector, e intenta promover y coordinar actividades relacionadas con la conservación y uso de los recursos genéticos. El documento ha sido consensuado tras un proceso participativo compartido por la administración forestal y distintos centros de investigación y universidades, e incluye la definición de prioridades y la propuesta de actividades que se centran básicamente en la optimización de la eficiencia en el uso de las herramientas e infraestructuras existentes, y en el incremento de las sinergias. La implementación de la Estrategia se llevará a cabo a través del desarrollo de distintos Planes Nacionales de Actuación. Finalmente, se mejorarán los mecanismos de coordinación de cara a mantener los niveles de cooperación alcanzados a lo largo del proceso de elaboración de la Estrategia.

7 pags., 4 figs., 2 tabs. -- Open Access funded by Creative Commons Atribution Licence 4.0 ; The quasi-free scattering reactions C(p,2p) and C(p,pn) have been studied in inverse kinematics at beam energies of 300–400 MeV/u at the RB-LAND setup. The outgoing proton-proton and proton-neutron pairs were detected in coincidence with the reaction fragments in kinematically complete measurements. The efficiency to detect these pairs has been obtained from GEANT4 simulations which were tested using the C(p,2p) and C(p,pn) reactions. Experimental cross sections and momentum distributions have been obtained and compared to DWIA calculations based on eikonal theory. The new results reported here are combined with previously published cross sections for quasi-free scattering from oxygen and nitrogen isotopes and together they enable a systematic study of the reduction of single-particle strength compared to predictions of the shell model over a wide neutron-to-proton asymmetry range. The combined reduction factors show a weak or no dependence on isospin asymmetry, in contrast to the strong dependency reported in nucleon-removal reactions induced by nuclear targets at lower energies. However, the reduction factors for (p,2p) are found to be 'significantly smaller than for (p,pn) reactions for all investigated nuclei. ; This work was supported by the German Federal Ministry of Education and Research (BMBF projects 05P2015RDFN1 and 05P15WOFNA), through the GSI-TU Darmstadt cooperation agreement, by the State of Hesse through the LOEWE center HIC for FAIR, and the Helmholtz-Gemeinschaft through the graduate school HGS-HIRe. This work was supported by the European Union by means of the European Commission within its Seventh Framework Program (FP7) via ENSAR (Contract No. 262010), and the Spanish CICYT research grants FPA2012-32443, FPA2015-64969-07387, and FPA2015-69640-C2-1-P. This work has supported by the Swedish Research Council under contract number 621-2011-5324. C.A.B. acknowledges support from the U.S. NSF grant No. 1415656 and the U.S. DOE grant No. DE-FG02-08ER41533. Supported by the Portuguese FCT under the project PTDC/FIS/ 103902/2008.