5,465 research outputs found
Signal processing for 100Gb/s: OFDM vs single-carrier
No full textOFDM is compared to the well-established single-carrier data transmission using high-level modulation formats and coherent detection. The analysis of the two alternative solutions is carried out in the 100 Gb/s scenario
Acer-Fraxinus dominated woods of the Italian peninsula: a floristic and phytogeographical analysis
Get PDFForest communities dominated by noble broad-leaved trees (maple, lime and ash) in Europe are of elevated scientific and conservation interest for the European Union. In this paper, we first present a synthesis of the maple and ash forests in peninsular Italy. By classifying these forests, we distinguish seven main groups for the territory, which only broadly match the syntaxa proposed in the literature. The variability of the Apennine data is then analysed floristically and phytogeographically (using chorological components) in a central-southern European context, using numerical classification, INSPAN, and direct ordination of several synoptic tables. These analyses allow us to identify six different groups of European Acer-Fraxinus communities. Canonical Variates Analysis (CVA) of the geographical components confirms the existence of distinct phytogeographical groups. In particular, we highlight the clear distinction between central European (including the Alps) and southern European coenoses. Among the latter there was a clear floristic and chorological distinction between Balkan and Apennine groups. These results reflect the biogeographical subdivisions of Europe, but do not support the syntaxonomical schemes proposed by other authors, which are based only on floristic-ecological information or (recently) use a smaller data set of Italian relevés. This study also shows that syntaxonomical schemes above the association level should pay more attention to phytogeographical aspects rather than focus on floristic-ecological information alone, in order to propose models that are of value on a geographical scale
Notes on the nomenclature and typification of Festuca marginata subsp. gallica (Poaceae, Loliinae)
No full textIn the course of the systematic revision of the aggregate of Festuca circummediterranea Patzke in Gutermann et al. (1974: 261), in progress by the authors, a nomenclature issue concerning the validity of the combination “Festuca marginata subsp. gallica” proposed by Breistroffer (1966: 79) and its type emerged, which we aimed to resolve in the present contribution
Il genere Festuca e i generi affini per la nuova “Flora critica d’Italia”.Introduzione
No full textThe Genus Festuca, and allied genera, for the new “Flora critica d’Italia”. Introduction - The methodological bases for the review of the genus Festuca, and allied genera Schedonorus, Leucopoa and Drymochloa for the new “Flora critica d’Italia” are here illustred
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