33 research outputs found
Comparative assessment of global irradiation from a satellite estimate model (CM SAF) and on-ground measurements (SIAR): a Spanish case study
An analysis and comparison of daily and yearly solar irradiation from the satellite CM SAF
database and a set of 301 stations from the Spanish SIAR network is performed using data of
2010 and 2011. This analysis is completed with the comparison of the estimations of effective
irradiation incident on three different tilted planes (fixed, two axis tracking, north-south hori-
zontal axis) using irradiation from these two data sources. Finally, a new map of yearly values
of irradiation both on the horizontal plane and on inclined planes is produced mixing both
sources with geostatistical techniques (kriging with external drift, KED)
The Mean Absolute Difference (MAD) between CM SAF and SIAR is approximately 4% for
the irradiation on the horizontal plane and is comprised between 5% and 6% for the irradiation
incident on the inclined planes. The MAD between KED and SIAR, and KED and CM SAF is
approximately 3% for the irradiation on the horizontal plane and is comprised between 3% and
4% for the irradiation incident on the inclined planes.
The methods have been implemented using free software, available as supplementary ma-
terial, and the data sources are freely available without restrictions
Barbarians at the British Museum: Anglo-Saxon Art, Race and Religion
A critical historiographical overview of art historical approaches to early medieval material culture, with a focus on the British Museum collections and their connections to religion
Estimating PV Module Performance over Large Geographical Regions: The Role of Irradiance, Air Temperature, Wind Speed and Solar Spectrum
Comparison of potential solar electricity output from fixed-inclined and two-axis tracking photovoltaic modules in Europe
Quantifying the amplified bias of PV system simulations due to uncertainties in solar radiation estimates
Geographical variation of the conversion efficiency of crystalline silicon photovoltaic modules in Europe
Exceptionally preserved beetles in a Triassic coprolite of putative dinosauriform origin
The Triassic was a crucial period for the early evolution and diversification of insects, including Coleoptera(1-3)-the most diverse order of organisms on Earth. The study of Triassic beetles, however, relies almost exclusively on flattened fossils with limited character preservation. Using synchrotron microtomography, we investigated a fragmentary Upper Triassic coprolite, which contains a rich record of 3D-preserved minute beetle remains of Triamyxa coprolithica gen. et sp. nov. Some specimens are nearly complete, preserving delicate structures of the legs and antennae. Most of them are congruent morphologically, implying that they are conspecific. Phylogenetic analyses suggest that T. coprolithica is a member of Myxophaga, a small suborder of beetles with a sparse fossil record, and that it represents the only member of the extinct family Triamyxidae fam. nov. Our findings highlight that coprolites can contain insect remains, which are almost as well preserved as in amber. They are thus an important source of information for exploring insect evolution before the Cretaceous-Neogene "amber time window."Treated as food residues, insect remains preserved in coprolites also have important implications for the paleoecology of insectivores, in this case, likely the dinosauriform Silesaurus opolensis