Measurements of global terrestrial solar radiation (Rs) are commonly recorded in meteorological stations. Daily variability of Rs has to be taken into account for the design of photovoltaic systems and energy efficient buildings. Principal components analysis (PCA) was applied to Rs data...

This paper is part of a research project which highlights the legal and ethical problems of mobile services aimed at children in Spain. The aim of the paper is to offer practical advice on self-regulation in the mobile telephone sector in Spain and to suggest measures that companies could adopt...