Click here to see my resume
Click on 'MPR' to learn about multivariate polynomial regression, a powerful empirical modeling technique for nonlinear data or time-series analysis which can outperform artificial neural networks.
In a paper published in the June 2009 issue of Scientific American magazine, I raised
the alarm about the depletion in U.S. and global high-grade phosphorus
resources: “The U.S. is the world’s largest producer and exporter of
phosphorus, at 23 percent of the total, but 80 percent of that amount comes
from a single source: pit mines near Tampa, Fla., which may not last more than
a few decades. Meanwhile nearly 75 percent of global reserves are in a single
To download a file with additional sources of information, references, and links, click HERE.
In 2005 I co-authored a book with Jim Alleman of
Click on 'ESIM' to download software for control and simulation of activated sludge plants. Four programs can be downloaded, including a full dynamic activated sludge simulator, programs for computing the Dynamic Sludge Age (DSA) parameter, a program to compute solids distribution and waste rate in step-feed processes, and a program to simulate gravity thickening.
Click on 'METALS' to download spreadsheet programs to compute aqueous solubility of lead, copper, iron, calcium and magnesium, as they depend upon pH, alkalinity, and TDS.
I have discovered an ancient source of the quatrefoil, an interesting symbol that for a time in the 90's was used as a logo for Stevens. It turns out to be the floor plan for the ancient Byzantine church, the Hagia Sophia, and is linked to its structural design. To see my essay on this, click HERE.