Main Deliverables
(not including presentations)

1. S. A. Gabriel, J.A. Faria, S. Kietnithiamorn, 2001. "Accelerating NEMS Convergence Using Theoretical & Numerical Methods," ASA/EIA Research Fellow Program Final Report, University of Maryland Account # 01431647, September 6.
   [Project report, available by request]

1. R. Egging, S. A. Gabriel. "Examining Market Power in the European Natural Gas Market", October 2004, Energy Policy, in press.
2. S. A. Gabriel, J. Zhuang, S. Kiet. 2005. "A Large-Scale Complementarity Model of the North American Natural Gas Market", Energy Economics, 27, 639-665.
3. S. A. Gabriel, J.-F. Zhuang, S. Kiet. 2004 "A Nash-Cournot Model for the North American Natural Gas Market," IAEE Conference Proceedings, Zurich, Switzerland, September.
4. S. A. Gabriel, S. Kiet, J. Zhuang. "A Competitive Equilibrium Model for the Natural Gas Market Based on a Mixed Complementarity Formulation", Operations Research, in press, zip file of gams code and sample data

Optimization of Distribution of Malodorous Products, 01/01/2003-12/31/2003, 10/01/2003-09/30/2004, 01/01/2005-09/30/2005,
10/01/05-09/30/06,
10/01/06-09/30/07

1. S. A. Gabriel, R. García-Bertrand, P. Sahakij, A. Conejo, 2006. "A Practical Approach in Approximating Bilinear Functions in Mathematical Programming Problems by Using Schur's Decomposition and SOS Type 2 Variables," Journal of the Operational Research Society, 57, 995-1004. [1 application in wastewater treatment]
2. S.A. Gabriel, P. Sahakij, M. Ramirez, C. Peot, 2007. "A Multiobjective Optimization Model for Processing and Distributing Biosolids to Reuse Fields," Journal of the Operational Research Society, 58, 850-864.
3. P. Sahakij, S.A. Gabriel, M. Ramirez, C. Peot, "Multi-objective Optimization Models for Distributing Biosolids to Reuse Fields: A Case Study for the Blue Plains Wastewater Treatment Plant," December 2007, in review.

Statistical Modeling of Biosolids Odor Levels, 10/01/2003-09/30/2004, 10/01/2004-09/30/2005,
10/01/05-09/30/06,
10/01/06-09/30/07,
10/01/07-06/30/08

1. S. A. Gabriel, S.Vilalai, S.C. Arispe, H. Kim, L.L. McConnell, A. Torrents, C. Peot, M. Ramirez. 2005 " Prediction of Dimethyl Disulfide Levels from Biosolids Using Statistical Modeling," J. Environ. Sci. Health, Part A 40(11), 2009-2025.
2. S. A. Gabriel, S. Vilalai, C. Peot, M. Ramirez, 2006" Statistical Modeling to Forecast Odor Levels of Biosolids Applied to Reuse Sites," ASCE Journal of Environmental Engineering 132(5), 479-488.
3. S.A. Gabriel, S. Vilalai, P. Sahakij, M. Ramirez, C. Peot, "Models for Improving Management of Biosolids Odors at Wastewater Treatment Plants Taking Into Account Uncertain Factors," June 2008, in review.

1. J. Zhuang, S.A. Gabriel, "A Complementarity Model for Solving Stochastic Natural Gas Market Equilibria," January 2006, in review.
2. S.A. Gabriel, J. Zhuang, R. Egging, “Solving Stochastic Complementarity Problems in Energy Market Modeling Using Scenario Reduction,” November 2006, in review.
3. R. Egging, S.A. Gabriel, F.Holz, J. Zhuang, "A Complementarity Model for the European Natural Gas Market," November 2006, in review.

1. Y. Shim, S.A. Gabriel, A. Desai, P. Sahakij, S. Milner, "A Fast Heuristic Method for Minimizing Traffic Congestion on Reconfigurable Ring Topologies," September 2005, Journal of the Operational Research Society, accepted.
2. S.A. Gabriel, Y. Shim, J. Llorca, , S. Milner, "A Multiobjective Optimization Model for Dynamic Reconfiguration of Ring Topologies with Stochastic Load," October 2006, Networks and Spatial Economics, in press.