Aerial deposition of Ni from a refinery in Port Colborne, Ontario, Canada has resulted in the enrichment of 29 km of land with Ni concentrations exceeding the Canadian Ministry of the Environment’s remedial action level of 200 mg kg . Several studies on these soils have shown that making the soils calcareous was effective at reducing chemically extractable Ni, as well as alleviating Ni phytotox...

In this work is presented a general architecture for a multi physical agent network system based on the coordination and the behaviour management. The system is organised in a hierarchical structure where are distinguished the individual agent actions and the collective ones linked to the whole agent network. Individual actions are also organised in a hybrid layered system that take advantages ...

Exact solutions are presented for Burgers’ equation in a fmite layer connected to an underlying semi-infinite medium of different conductivity and diffusivity. A constant-flux boundary condition is assumed at the surface. This has direct application to steady rainfall on layered field soils. At large times, a travelling wave profile develops in the deep layer and the concentration in the upper ...

Abstract Dispersivity is a measurable parameter in soil porous media that used for studying the transport of contaminants to groundwater. The value this depends on various factors, including kind (homogeneous or heterogeneous), flow velocity, initial contaminant concentration, travel distance, and sampling method. A physical model with dimensions 0.10 m width, 0.80 height, 1.10 length was const...

Imaging spectrometer data from the ISM instrument on Phobos 2 were used to characterize spatial variations in near-infrared spectral properties of the martian surface, to determine the correspondence between near-infrared and visible-wavelength spectral variations, and to assess lithologic variations in the surface materials. All data were radiometrically calibrated and corrected for effects of...