Friday Facts, October 15, 2010, Vol. 75

Bureau of Nutrition and Health Promotion part of the Iowa Department of Public Health produces of weekly newsletter about the Iowa WIC Program for the State of Iowa citizen.

EPI Update, April 15, 2011

Weekly newsletter for Center For Acute Disease Epidemiology of Iowa Department of Public Health.

Agri-News, August 4, 2006, Vol. 6, no. 15

Crop and livestock summaries for the state of Iowa, produced by the Iowa Department of Agriculture.

Agri-News, September 9, 2010, Vol. 10, no. 15

Crop and livestock summaries for the state of Iowa, produced by the Iowa Department of Agriculture.

Agri-News, October 15, 2010, Vol. 10, no. 18

Crop and livestock summaries for the state of Iowa, produced by the Iowa Department of Agriculture.

Agri-News, September 16, 2009, Vol. 9, no. 15

Crop and livestock summaries for the state of Iowa, produced by the Iowa Department of Agriculture.

Agri-News, October 7, 2008, Vol. 8, no. 15

Crop and livestock summaries for the state of Iowa, produced by the Iowa Department of Agriculture.

Agri-News, October 15, 2007, Vol. 7, no. 15

Crop and livestock summaries for the state of Iowa, produced by the Iowa Department of Agriculture.

Modeling water movement in horizontal columns using fractal theory

Fractal mathematics has been used to characterize water and solute transport in porous media and also to characterize and simulate porous media properties. The objective of this study was to evaluate the correlation between the soil infiltration parameters sorptivity (S) and time exponent (n) and the parameters dimension (D) and the Hurst exponent (H). For this purpose, ten horizontal columns with pure (either clay or loam) and heterogeneous porous media (clay and loam distributed in layers in the column) were simulated following the distribution of a deterministic Cantor Bar with fractal dimension H" 0.63. Horizontal water infiltration experiments were then simulated using Hydrus 2D software. The sorptivity (S) and time exponent (n) parameters of the Philip equation were estimated for each simulation, using the nonlinear regression procedure of the statistical software package SAS®. Sorptivity increased in the columns with the loam content, which was attributed to the relation of S with the capillary radius. The time exponent estimated by nonlinear regression was found to be less than the traditional value of 0.5. The fractal dimension estimated from the Hurst exponent was 17.5 % lower than the fractal dimension of the Cantor Bar used to generate the columns.

EPI Update, July 15, 2011

Weekly newsletter for Center For Acute Disease Epidemiology of Iowa Department of Public Health.

Secure and Prepared Newsletter, July 15, 2011, Vol. 7, no. 11

A bi-weekly newsletter for those involved in the fields of homeland security and/or emergency management