The present report outlines recent results relative to the development of new linear and nonlinear approaches for solving groundwater flow problems. Efficient and robust simulation of complex processes in environmental applications is crucial for understanding, forecasting and performing opportune and reliable decisions. This research effort focuses in developing efficient solvers for two main ...

This study concerns numerical methods for efficiently solving the Richards equation where different weak formulations and computational techniques are analyzed. The spatial discretizations based on standard or mixed finite element methods. Different implicit semi-implicit temporal discretization of second-order accuracy studied. To obtain a linear system schemes, we propose using extrapolation ...

The accurate description of the flow water in porous media is greatest importance due to its numerous applications several areas (groundwater, soil mechanics, etc.). nonlinear Richards equation often used as governing that describes this phenomenon and a large number research studies aimed solve it numerically. However, nonlinearity constitutive expressions for permeability, remains challenging...

To address the subject of women and nutrition, it is necessary to work across disciplines. There is a long tradition of nutritionists and anthropologists working together in the United States, thanks to the pioneering work of Margaret Mead in this area. In Britain, the collaboration began even earlier with Audrey Richards (1932) in the 1930s. This collaboration continues today in the Economic a...