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- Frey, H.C., E.S. Rubin, and J.S. Salmento, “Evaluation of the Fluidized Bed Copper Oxide Process Using A Probabilistic Engineering Model,” Proceedings of the Sixth Annual International Pittsburgh Coal Conference, University of Pittsburgh, Pittsburgh, Pennsylvania, 1989, pp. 356-365.
- Diwekar, U.M., E.S. Rubin, and H.C. Frey, “Stochastic Modeling of Integrated Coal Gasification Combined Cycle Systems Using ASPEN,” Proceedings of the Sixth Annual International Pittsburgh Coal Conference, University of Pittsburgh, Pittsburgh, Pennsylvania, 1989, pp. 837-846.
- Rubin, E.S., J.S. Salmento, and H.C. Frey, “Development and Application of the Integrated Environmental Control Model,” Proceedings, Sixth Annual Coal Preparation, Utilization, and Environmental Control Contractors Conference, Pittsburgh Energy Technology Center, U.S. Department of Energy, Pittsburgh, Pennsylvania, August 1990, pp. 375-382.
- Frey, H.C., E.S. Rubin, and U.M. Diwekar, “Modeling Uncertainties in IGCC System Performance and Cost,” Proceedings of the Seventh Annual International Pittsburgh Coal Conference, University of Pittsburgh, Pittsburgh, Pennsylvania, 1990, pp. 805-814.
- Diwekar, U.M., H.C. Frey, and E.S. Rubin, “Stochastic Modeling of Chemical Processes,” Paper 216e presented at the American Institute of Chemical Engineers 1990 Annual Meeting, Chicago, Illinois, November 11-16, 1990.
- Rubin, E.S., H.C. Frey, and U.M. Diwekar, “Characterizing Uncertainties in IGCC System Performance and Cost,” Proceedings of the Eleventh Annual Gasification and Gas Stream Cleanup Systems Contractors Review Meeting, Volume 1, DOE/METC-91/6123 (DE92001101), U.S. Department of Energy, Morgantown, West Virginia, August 1991, pp. 66-75.
- Frey, H.C., and E.S. Rubin, “Modeling IGCC Performance, Emissions, and Cost Using Probabilistic Engineering Models,” Proceedings of the Eighth Annual International Pittsburgh Coal Conference, University of Pittsburgh, Pittsburgh, Pennsylvania, October, 1991.
- Frey, H.C., E.S. Rubin, and U.M. Diwekar, “Process Modeling of Advanced Technologies Under Uncertainty,” Paper No. 58a presented at the American Institute of Chemical Engineers 1992 Spring National Meeting, New Orleans, Louisiana, March 29 – April 2, 1992.
- Frey, H.C., and E.S. Rubin, “Evaluate Uncertainties in Advanced Process Technologies,” Chemical Engineering Progress, 88(5):63-70 (May 1992).
- Rubin, E.S., H.C. Frey, and M.B. Berkenpas, “Development of the Integrated Environmental Control Model,” Proceedings, Eighth Annual Coal Preparation, Utilization, and Environmental Control Contractor’s Conference, Pittsburgh Energy Technology Center, U.S. Department of Energy, Pittsburgh, Pennsylvania, July 27-30, 1992, pp. 619-626.
- Frey, H.C., “Quantitative Analysis of Uncertainty and Variability in Environmental Policy Making,” 1992 Environmental Science and Engineering Fellows Program Reports, American Association for the Advancement of Science, Washington, DC, 1993, pp. 25-33.
- Berkenpas, M.B., E.S. Rubin, H.C. Frey, and B. Toole-O’Neil, “Modeling Air Toxics Emissions From Electric Power Plants,” Proceedings of the 1993 AWMA/EPRI/ASME International Symposium on Integrated Energy and Environmental Management, Air and Waste Management Association, Pittsburgh, PA, March 1993, pp. 275-285.
- Rubin, E.S., M.B. Berkenpas, and H.C. Frey, “Development of the Integrated Environmental Control Model,” Proceedings, Ninth Annual Coal Preparation, Utilization, and Environmental Control Contractor’s Conference, Pittsburgh Energy Technology Center, U.S. Department of Energy, Pittsburgh, Pennsylvania, July 19-22, 1993, pp. 447-454.
- Shih, J.S, and H.C. Frey, “Coal Blending Optimization Under Uncertainty,” Proceedings of the Tenth Annual International Pittsburgh Coal Conference, University of Pittsburgh, Pittsburgh, Pennsylvania, September, 1993, pp. 1110-1115.
- Frey, H.C., “Economic Model of the Fluidized Bed Copper Oxide Process for SO2/NOxControl,” Proceedings of the Tenth Annual International Pittsburgh Coal Conference, University of Pittsburgh, Pittsburgh, Pennsylvania, September, 1993, pp. 597-602.
- Frey, H.C., “Engineering-Economic Evaluation of SCR NOxControl Systems for Coal-Fired Power Plants,” Proceedings of the American Power Conference, Vol. 57-II, Illinois Institute of Technology, Chicago, Illinois, April 1995, pp. 1583-1588.
- Diwekar, U.M, E.S. Rubin, and H.C. Frey, “Optimization of Environmental Control System Design for an IGCC Power Plant,” Proceedings of the American Power Conference, Vol. 58-I, Illinois Institute of Technology, Chicago, Illinois, April 1996, pp. 58-63.
- Frey, H.C., and P. Agarwal, “Probabilistic Analysis and Optimization of New Power Generation Technologies: A Case Study for the Externally-Fired Combined Cycle,” Proceedings of the American Power Conference, Vol. 58-I, Illinois Institute of Technology, Chicago, Illinois, April 1996, pp. 52-57.
- Diwekar, U.M., E.S. Rubin and H.C. Frey, “Optimal Design of Advanced Power Systems Under Uncertainty,” Proceedings of ECOS ’96 International Symposium—Efficiency, Costs, Optimization, Simulation, and Environmental Aspects of Energy Systems, Royal Institute of Technology, Stockholm, Sweden, June 1996.
- Frey, H.C., and Z. Iwanski, “Probabilistic Modeling of Gasification Repowering for an Oil Refinery in Poland,” Conference Proceedings, POWER-GEN ‘97 Europe, Volume III (held June 17-19 in Madrid, Spain), Pennwell: The Netherlands, June 1997, pp. 417-435.
- Frey, H.C., and Z. Iwanski, “Methods for Characterizing and Managing Technological Risks in Advanced Power Generation Systems: Application to Gasification Repowering in Poland,” in 1997 Gasification Technologies Conference (held October 5-8 in San Francisco, CA), EV-107922, Electric Power Research Institute, Palo Alto, California, October 1997.
- Rhodes, D.S., and H.C. Frey, “Quantification of Variability and Uncertainty in AP42 Emission Factors: NOx Emissions from Coal-Fired Power Plants,” Emission Inventory: Planning for the Future (held October 28-30 in Research Triangle Park, NC), Air and Waste Management Association, Pittsburgh, Pennsylvania, October 1997, pp. 147-161.
- Frey, H.C., “Variability and Uncertainty in Highway Vehicle Emission Factors,” Emission Inventory: Planning for the Future (held October 28-30 in Research Triangle Park, NC), Air and Waste Management Association, Pittsburgh, Pennsylvania, October 1997, pp. 208-219.
- Frey, H.C., R. Bharvirkar, R. Thompson, and S. Bromberg, “Quantification of Variability and Uncertainty in Emission Factors and Inventories,” Conference on the Emission Inventory, Air and Waste Management Association, Pittsburgh, Pennsylvania, December 1998.
- Frey, H.C., M.A. Barlaz, M. Pickett, and S. Vaswani, “New Methods for Assessment of Pollution Prevention Technologies: Integration of Probabilistic Process Modeling and Design; Life Cycle Analysis; and Regional Environmental Benefits Assessment,” Proceedings of the NSF Design and Manufacturing Research Conference, Vancouver, Canada, January 3-6, 2000.
- Frey, H.C., N. Rouphail, A. Unal, and J. Colyar, “Emissions and Traffic Control: An Empirical Approach,” Presented at CRC On-Road Vehicle Emissions Workshop, San Diego, CA, March 27-29, 2000.
- Frey, H.C., M.A. Barlaz, M. Pickett, and S. Vaswani, C. Xie, and M. Li, “New Methods for Assessment of Pollution Prevention Technologies: Integration of Probabilistic Process Modeling and Design; Life Cycle Analysis; and Regional Environmental Benefits Assessment,” Proceedings of the NSF Design, Manufacturing, and Industrial Innovation Research Conference, Tampa, FL, January 7-10, 2001.
- Frey, H.C., M.A. Barlaz, M. Li, and C. Xie, “New Methods for Assessment of Pollution Prevention Technologies: Integration of Probabilistic Process Modeling and Design; Life Cycle Analysis; and Regional Environmental Benefits Assessment,” Proceedings of the NSF Design, Manufacturing, and Industrial Innovation Research Conference, San Juan, Puerto Rico, January, 2002.
- Hanna, S.R., J. Wilkinson, A. Russell, J. Vukovich, H.C. Frey, “Estimating Uncertainties of Air Quality Modeling Systems Using Monte Carlo Approaches,” Proceedings, AMS Norfolk Conference, Norfolk, VA, May 2002.
- Frey, H.C. and J. Zheng, “Method for Development of Probabilistic Emission Inventories: Example Case Study for Utility NOx Emissions,” Proceedings, U.S. Environmental Protection Agency Emission Inventory Conference, Atlanta, GA, April 2002.
- Frey, H.C. and Y. Zhao, “Quantification of Variability and Uncertainty in Air Toxic Emission Factors When Data Contains Non-Detected Values,” Proceedings, U.S. Environmental Protection Agency Emission Inventory Conference, Atlanta, GA, April 2002.
- Frey, H.C., and S. Bammi, “Quantification of Variability and Uncertainty for Selected Nonroad Mobile Source Emission Factors,” Proceedings, U.S. Environmental Protection Agency Emission Inventory Conference, Atlanta, GA, April 2002.
- Frey, H.C., A. Unal, N.M. Rouphail, and J.D. Colyar, “Use of Onboard Tailpipe Emissions Measurements for Development of Mobile Source Emission Factors,” Proceedings, U.S. Environmental Protection Agency Emission Inventory Conference, Atlanta, GA, April 2002.
- Frey, H.C., and S. Li, “Methods for Quantifying Variability and Uncertainty in AP-42 Emission Factors: Case Studies for Natural Gas-Fueled Engines,” Proceedings, U.S. Environmental Protection Agency Emission Inventory Conference, Atlanta, GA, April 2002.
- Frey, H.C., M.A. Barlaz, and M. Li, “New Methods for Assessment of Pollution Prevention Technologies,” Proceedings of the NSF Design, Manufacturing, and Industrial Innovation Research Conference, Birmingham, AL, January, 2003.
- Frey, H.C., A. Unal, and J. Chen, “Evaluation and Recommendation of a Modal Method for Modeling Vehicle Emissions,” Proceedings, U.S. Environmental Protection Agency Emission Inventory Conference, San Diego, CA, April 2003.
- Houyoux, M., D.H. Loughlin, A.P. Holland, H.C. Frey, and A. Abdel-Aziz, “Design, Application, and Recommendations for Including Inventory Uncertainties in Emission Inventory Preparation for Modeling,” Proceedings, U.S. Environmental Protection Agency Emission Inventory Conference, San Diego, CA, April 2003.
- Frey, H.C., N.M. Rouphail, and K. Kim, “Operational Evaluation of In-Use Emissions and Fuel Consumption of B20 versus Diesel-Fueled Heavy Duty Vehicles,” Proceedings, On-Road Vehicle Emissions Workshop, held March 29-31, 2004, San Diego, CA, published by Coordinating Research Council, Atlanta, GA.
- Frey, H.C., and Y. Zhao, “Development of Probabilistic Emission Inventories of Air Toxics for an Urban Area,” Proceedings, U.S. Environmental Protection Agency Emission Inventory Conference, Clearwater, FL, June 2004.
- Frey, H.C., and K. Zhang, “Implications of Measured In-Use Light Duty Gasoline Vehicle Emissions for Emission Inventory Development at High Spatial and Temporal Resolution,” Proceedings, International Emission Inventory Conference, U.S. Environmental Protection Agency, Raleigh, NC, May 15-17, 2007.
- Frey, H.C., and P.Y. Kuo, “Assessment of Potential Reduction in Greenhouse Gas (GHG) Emissions in Freight Transportation,” Proceedings, International Emission Inventory Conference, U.S. Environmental Protection Agency, Raleigh, NC, May 15-17, 2007.
- Frey, H.C., W.J. Rasdorf, S.H. Pang, K. Kim, and P. Lewis, “Methodology for Activity, Fuel Use, and Emissions Data Collection and Analysis for Nonroad Construction Equipment,” Proceedings, International Emission Inventory Conference, U.S. Environmental Protection Agency, Raleigh, NC, May 15-17, 2007.
- Frey, H.C., “Quantification of Uncertainty in Emission Factors and Inventories,” Proceedings, International Emission Inventory Conference, U.S. Environmental Protection Agency, Raleigh, NC, May 15-17, 2007.
- Coehlo, M., D.S. Soares, H.C. Frey, “Energy use and greenhouse gases emissions in vehicles: Contrasting alternative fuels, propulsion systems and market policies in Portugal and USA,” Conference on Rethinking Transportation, Louisville, KY, October 2008
- Rouphail, N.M., H. Zhai, H.C. Frey, and B. Graver, “Impact of Alternative Vehicle Technologies and Land Use Patterns on Long-Term Regional On-Road Vehicle Emissions,” 12th World Congress on Transportation Research, Lisbon, Portugal, July 11-15, 2010.