soil samples were collected from seven sites in and around the metropolitan area of mexicocity. the locations were chosen as possible sources of fugitive dusts which contribute to suspended particulate matter in the atmosphere of mexico city. x-ray fluorescence (xrf) was used to determine the concentrations of several major elements (si, k, ca, ti, mn, and fe), as well as of other trace element...

The European Parliament has continuously supported these goals. It is a common understanding that this change will require a transition from monopolised hierarchically controlled Power networks to customer oriented Smart Grids operating in deregulated energy markets. However, this poses several regulatory, organizational and technical challenges to be identified and addressed. To that end sever...

It is shown that the quantization of a superparticle propagating in an N = 1, D = 4 superspace extended with tensorial coordinates results in an infinite tower of massless spin states satisfying the Vasiliev unfolded equations for higher spin fields in flat and AdS4 N = 1 superspace. The tensorial extension of the AdS4 superspace is proved to be a supergroup manifold OSp (1|4). The model is man...

The delivery of Public Services to citizens is becoming a challenging task, as urban populations increase and the related networks are becoming more complex and entangled. In this article, we present a platform designed for the optimal coordination of a city's public agencies and emergency response teams. Such coordination is particularly relevant in emergency situations when the infrastructure...

This article proposes a new business model framework that allows the design and analysis of value networks for mobile services in a public context. It starts from a validated business model framework that relies on 12 design parameters to evaluate business models on, and expands it by eight parameters to include important aspects that come into play when a public entity (i.e. a city government)...