- Full text PDF available (4)
- This year (0)
- Last five years (6)
1 This report is a contribution to the Millennium Ecosystem Assessment prepared by the Portugal Sub-Global Assessment Team. The report has been prepared and reviewed through a process approved by the MA Board but the report itself has not been accepted or approved by the Assessment Panel or the MA Board.
The prevalence and intensity of avian haemosporian infections (genera Haemoproteus and Plasmodium) were investigated using molecular techniques and microscopy in nine passerine species at three Portuguese reed beds along a small latitudinal gradient. The effect of age, sex, season, site and year in the infection prevalence was evaluated for some of these… (More)
There is nowadays an increasing need for database replica-tion, as the construction of high performance, highly available, and large-scale applications depends on it to maintain data synchronized across multiple servers. A particularly popular approach, used for instance by Facebook, is the MySQL open source database management system and its built-in… (More)
briófitos y pteridófitos). Son discutidas también las potencialidades y limitaciones de " Gap Analysis " para la evaluación de la Red Natura 2000 en Portugal.
Objective Synthesize evidence on effectiveness of interventions designed to improve access to health services by indigenous populations. Methods Review of systematic reviews published as of July 2015, selecting and analyzing only studies in the Region of the Americas. The bibliographic search encompassed MEDLINE, Lilacs, SciELO, EMBASE, DARE, HTA, The… (More)
This paper reviews different views on the issue of biodiversity evaluation and measurement in the context of land management. Approaches from community ecologists, taxonomists and conservationists are compared. Two main strategies for biodiversity evaluation are identified. The first-exclusive process-seeks to achieve maximum representation of biodiversity… (More)
The insertion of magnetic impurities in a conventional superconductor leads to various effects. In this work we show that the electron density is affected by the spins (considered as classical) both locally and globally. The charge accumulation is solved self-consistently. This affects the transport properties along magnetic domain walls. Also, we show that… (More)
The effect of a magnetic field on a two-dimensional Chern band insulator is discussed. It is shown that, unlike the trivial insulator, an anomalous Hall insulator with Chern number C becomes a metal when a magnetic field is applied at constant particle density, for any C > 0. For a time-reversal invariant topological insulator with a spin Chern resolved… (More)
We introduce a Hamiltonian for fermions on a lattice and prove a theorem regarding its topological properties. We identify the topological criterion as a [Formula: see text]-topological invariant [Formula: see text] (the Pfaffian polynomial). The topological invariant is not only the first Chern number, but also the sign of the Pfaffian polynomial coming… (More)