Selected Abstracts



  The following is a list of selected abstracts and invited talks

             Meeting presentatoins and abstracts

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        • Hui, D., Qi Demg, C-L, Yu, S. Aras, E.K. Dzantor, P. Fay, W. Shen, Y. Luo. 2017. Responses of switchgrass to precipitation changes: Nonlinear and Asymmetric? 102nd ESA Annual Meeting in Portland, Oregon, August 6-11, 2017 (Oral).
        • Qi Deng, D. Zhang, X. Han, G. Chu, Q. Zhang, D. Hui. 2017. Mechanistic controls of soil respiration in response to rainfall changes in a tropical forest. 102nd ESA Annual Meeting in Portland, OR, August 6-11, 2017. 
        • Reddy, K.C, D. Hui. Does no-tillage reduce greenhouse gas emission and enhance soil organic carbon in croplands? 1st World Conference on Soil and Water Conservation under Global Change: Sustainable Life on Earth through Soil and Water Conservation, Lleida, Spain, 12-16 June, 2017. 
        • Jaquantey Bowens, Kenya Collins, Sadiye Aras, Chih-Li Yu, Qi Deng, and Dafeng Hui. 2017. Effects of precipitation changes on switchgrass physiology, roots and biomass. 2017 ERN Conference, Washington DC, March 2-4, 2017.
        • Hui. D., W. Porter, J. R Philips, M Aidar, M.A. Mayes. 2016. Dynamics of CO2 emission from tropical forest soils: Lab incubation and modeling. 101st ESA Annual Meeting in Fort Lauderdale, Florida, August 7-12, 2016 (Oral).
        • Deng, Q., D. Hui, S. Dennis, K.C. Reddy. 2017. Nitrogen additions and terrestrial ecosystem phosphorus cycle: a meta-analysis. 101st ESA Annual Meeting in Fort Lauderdale, Florida, August 7-12, 2016.
        • Ding, X., Y. Jiang, L. He, Q. Zhou, J. Yu, D. Huang, D. Hui. 2016. Alleviation of high root zone temperature stress by exogenous glutathione on cucumber seedling. 101st ESA Annual Meeting in Fort Lauderdale, Florida, August 7-12, 2016.
        • Hui, D. 2016. Using TSU wetland in ecology instruction. Round-table talk. Life Discovery- Doing Science 2016, March 18, 2016. 
        • Yu, C-L, D. Hui, Q. Deng, E.K. Dzantor, S. Zhou, S. Dennis, R. Sauve, P. Fay, W. Shen, Y. Luo, and T. Johnson. 2016. Effects of precipitation change on switchgrass photosynthesis, growth, and biomass: a mesocosm study. American Society of Agronomy (ASA) 2016 meeting, Nov. 6-9, Phoenix, AZ.
        • Hui, D., Q. Deng, J. Wang, CL Yu, C. Li, C. Reddy, S. Dennis. 2015. Assessing the impacts of tillage and fertilization management on nitrous oxide emission in a cornfield using the DNDC model. AGU Fall Meeting, Dec. 14-18, 2015, San Francisco, CA.
        • Deng, Q., D. Hui, Y. Luo, J. Elser, YP Wang, I Loladze, Q. Zhang, S Dennis. 2015. Down-regulation of tissue N:P ratios in terrestrial plants by elevated CO2. AGU Fall Meeting, Dec. 14-18, 2015, San Francisco, CA. 
        • McMahon, D., Q. Deng, Y. Xiang, C. Yu, D. Hui, R. Jackson. 2015. Soil phosphorus gains and losses with afforestation: A meta-analysis reveals increased short-term availability, declining total stocks, and the importance of prior land use. American Geophysical Union (AGU) Fall Meeting, Dec. 14-18, 2015, San Francisco, CA. 
        • Fay, P., V. Jin, M. Aspinwall, L Reichmann, A. Procter, D. Hui, R. Jackson, H. Polley. 2015. The CO2 losses from grassland soils: effects of atmospheric CO2 enrichment and implications from climate change adaptation. American Society of Agricultural and Biological Engineers (ASABE) 1st Climate Change Symposium: Adaptation and Mitigation. May 3-5, 2015. Chicago, Illinois.  
        • Hui, D., C.L Yu, Q. Deng, S. Zhou, EK. Dzantor. 2015. Effects of precipitation changes on switchgrass gas exchange and biomass. 100 ESA Annual Meeting in Baltimore, MA, August 9-14, 2015. 
        • Yu, CL, D. Hui, J Wang, Q. Deng, C. Reddy, S. Dennis. 2015. Responses of corn physiology and yield to six different agricultural practices: a 3-year field study in Middle Tennessee. 100 ESA Annual Meeting in Baltimore, MA, August 9-14, 2015. 
        • Hui, D., E. Johnston, M. Mayes. 2015. Dynamics of CO2 emission of four tropical soils with and without phosphorus addition: Lab incubation and modeling. ORNL Summer Research Presentation.Oak Ridge, TN, July 2015.
        • Jian, S., J. Li, J. Chen, D. Hui, Y. Luo. A meta-analysis of effects of nitrogen addition on soil extracellular enzyme activity and soil carbon and nitrogen storage. 100 ESA Annual Meeting in Baltimore, MA, August 9-14, 2015.
        • Dennis, S., Q. Deng, D. Hui, C. Reddy. CO2, N2O and CH4 fluxes from agricultural soils under corn production. Argonomy, Program of the Southern Branch, American Society of Agronomy Annual Meeting, Feb. 1-3, 2015. Atlanta, GA. 
        • Hui, D., C. Yu,  J. Wang, C. Miller, S. Zhou, C. Reddy, S. Dennis. 2014. Contrasting responses of corn ecophysiological performance and yield to agricultural practices in two years with different rainfalls. ASAH Annual Conference 2014. Orlando, FL, July 28-31.
        • Qi Deng, Hui, D., J. Wang, T. Jima, S. Iwuozo, C. Yu, D. Smart, S. Zhou, C. Reddy, S. Dennis. 2014. Effects of no-tillage and improved fertilizer management on corn yield and soil N2O emission in middle Tennessee. ASAH Annual Conference 2014. Orlando, FL, July 28-31.
        • Yu, Chih-Li, Hui, D., T. Johnston, K. Porter, C. Wilson, C. Miller, S. Zhou, D. Duseja, F. Tegegne. 2014. Ecophysiological Performance, Growth and Yield of Four Pigeonpea Varieties Under Different Planting Dates and Densities in the Southeastern US. ASAH Annual Conference 2014. Orlando, FL, July 28-31.
        • Iwuozo, S.A, D. Hui and S. Dennis. 2013. Seasonal Dynamics of N2O and CO2 Emissions from a Corn Production System measured with the Eddy covariance and Chamber techniques. American Geophysical Union, Fall Meeting, December 9-13, San Francisco, CA.
        • Zhujia Ye, Suping zhou, Theodore Thannhauser, Tara Fish, Chihli Yu, Dafeng Hui, 2014. Identification of Drought-induced Leaf Proteomes in Switchgrass. International Plant & Animal Genome XXII. San Diego, CA, USA. Jan. 11-15, 2014.
        • Hui, D., M Mayes, G. Wang. 2013. Kinetic parameters of phosphatase: A Quantitative analysis. ESA Annual Meeting in Minneapolis, IN, August 5-10, 2013. 
        • Dzantor, EK, H. Pettigrew. E. Adeleke, D. Hui. 2013. Use of fly ash as soil amendment for biofuel feedstock production with concomitant disposal of waste accumulations. 2013 World of Coal Ash (WOCA) conference, April 22-25, 2013, Lexington, KY.
        • S. Dennis, D. Hui, J. Wang, T. Jima. 2013. Assessment of greenhouse gas emission from soil under corn production systems. ASA Southern Regional Branch Meeting, Feb. 3-5, 2013.
        • Hui, D., J. Wang, T. Jima, S. Dennis, C. Stockert, D. Smart, S. Bhattarai,  K. Brown, T. Sammis, and C. Reddy. 2012. Effects of agricultural practices on greenhouse gas emissions (N2O, CH4 and CO2) from corn fields. AGU Meeting. Dec. 3-7, 2012, San Francisco, CA.
        • Hui, D., D. Zhang, Q. Deng and G. Zhou. Improving model simulation of soil respiration in subtropical forests under precipitation change using a data assimilation approach. NSF RCN FORECAST Conference 2012: Promoting New Perspectives on Data Assimilation in Global Change Science, Woods Hole, MA, Oct. 8-11, 2012.
        • Hui, D., Jun Wang, W. Shen, X. Le, E. Nwameri#, P. Ganter, and H. Ren. 2012. Influences of biotic and abiotic factors on allometry and productivity-biomass relationship in Chinese forests. 2012 ESA Annual Meeting in Portland, Oregon, August 5-10, 2012. 
        • Wang, J., D. Hui, T. Jima, S. Bhattarai,S. Dennis, C. Stockert, D. Smart, T. Sammisc, and D. Miller. 2012. Eddy-covariance and chamber measured greenhouse gas emissions from a commercial corn field. AMS Meeting in Boston (20th Symposium on Boundary Layers and Turbulence 9-13 July 2012.
        • Hui, D., D. Zhang, R.J. Norby. 2011. Field litter decomposition rate estimation: does incubation starting time matter? 2011 IEEE International Conference on Multimedia Technology (ICMT), Hangzhou, China, 26-28 July, 2011.
        • Wilson, C.*, D. Hui, E. Nwaneri*, J. Wang, Q. Deng, D. Duseja, and F. Tegegne. 2012. Effects of Planting Dates, Densities, and Varieties on Ecophysiology of Pigeonpea in the Southeastern United States. TLASMP Conferences 2012, Murfreesboro, TN (Second Place Award).
        • Jennifer M. Cartwright, William J. Wolfe, Dafeng Hui, Thomas D. Byl, and E. Kudjo Dzantor. 2012. Hydrology and Soil Biology of Cedar Glade Ecosystems, TN American Water Resources Association (AWRA) meeting, April 12, 2012 (First Place Award).  
        • Brown, Kimberly*, C. Davidson*, D. Hui. 2012. Diurnal and seasonal variation of soil respiration in grasslands.  TN Capital Hill Presentation 2012, TLASMP Conference 2012, and TSU Centennial Celebration Biology Day 2012.
        • Sean McMillan*, Dafeng Hui, Tom Byl.  2012.  Storm Transport of Chemicals into Mammoth Cave. TN American Water Resources Association (AWRA) meeting, April 12, 2012 (2nd PLACE).
        • Victor Roland*, Carlton Cobb, Lonnie Sharpe, Patrice Armstrong, Dafeng Hui, and Thomas D. Byl. 2011. Interpreting a Spring Chemograph to Characterize Groundwater Recharge in an Urban, Karst Terrain. Karst Interest Group Proceedings, sponsored by U.S. Geological Survey, Fayetteville, Arkansas, April 26–29, 2011: U.S. Geological Survey Scientific Investigations Report 2011–5031, 212 p.
        • Hui, D, V. Chandola, Corie Wilson*, L. Gu, RR Vatsavai. 2010. A comparative Study of Vegetation Phenology using MODIS and AmeriFlux Data. Abstract B23G-0455 presented at 2010 Fall Meeting, AGU, San Francisco, Calif., 13-17 Dec.
        • Carlton Cobb*, Lonnie Sharpe, Dafeng Hui, and Tom Byl. 2011. Groundwater Recharge In An Urban, Karst Terrain.  (Poster presentation)  in the proceedings of Tennessee Chapter of American Water Resources Association, Burns, TN, April 13-15, 2011. 
        • Chloe Davidson*, E. Kudjo Dzantor, and Dafeng Hui. 2010. Spatial Variations of Soil Respiration in Bareground and Grassland Soils. Oral Presentation at Seventh Annual Tennessee Louis Stokes Alliance for Minority Participation (TLSAMP), Undergraduate Research Conference, Knoxville, TN, November 4-5, 2010
        • Qi Deng, Dafeng Hui, Guoyi Zhou, Deqiang Zhang, Juxiu Liu. Responses of soil respiration to elevated carbon dioxide and nitrogen addition in young subtropical forest ecosystems in China In AGU meeting hold in San Francisco, CA, 15-19 December 2009.Abstracts of Eos, Transactions, American Geophysical Union, Vol. 90 (Poster).
        • Carlton Cobb, Lonnie Sharpe, Patrice Armstrong, Dafeng Hui, and Tom Byl. 2010. Interpreting a spring’s chemographs to estimate groundwater recharge in an urban, karst terrain. Tennessee American Water Resources Association conference, April 14, 2010.
        • Hui, D., W. Shen. 2009. Equifinality and uncertainty in modeling soil respiration. In AGU meeting held in San Francisco, CA, 14-18, December 2009. Abstracts of Eos, Transactions, American Geophysical Union, Vol. 90, 2009.  
        • Hui, D., D. Zhang, Y. Luo, R.B. Jackson, R. Norby. 2008. Litter decomposition in terrestrial ecosystems: from estimation methods to environmental controls. In AGU meeting held in San Francisco, CA, 11-14 Dec. 2008. Abstracts of Eos, Transactions, American Geographical Union Vol. 89, 2008.
        • Hui, D. 2008. PS Verburg, JA Arnone III, Y. Luo. Dynamics and Partitioning of Whole Ecosystem Respiration in a Controlled Grassland Ecosystem. In annual ESA meeting held in Milwaukee, WI, 3-8 August 2008. Abstracts of the Ecological Society of America.
        • Hui, D. 2007. Inverse modeling of parameters in a process-based model Biome-BGC at Duke Pine Forest. In AGU meeting held in San Francisco, CA, 11-14 December 2007.Abstracts of Eos, Transactions, American Geophysical Union, Vol. 88, 2007.
        • Hui, D., P. Fay, A. Procter, H.B. Johnson, H.W. Polley, and R.B. Jackson. 2006. Response of Soil Respiration to a CO2 Gradient from Subambient to Elevated Concentrations in Grassland Ecosystems. In AGU meeting held in San Francisco, CA, 11-15 December 2006 (oral).
        • Hui, D., Y. Luo, R.B. Jackson. 2005. Uncertainty in power law analysis: influence of sample size, measurement error, and analysis method. In AGU meeting held in San Francisco, CA, 5-9 December 2005. Abstracts of Eos, Transactions, American Geophysical Union, Vol. 86, No. 48, 2005.
        • Hui, D., R.B. Jackson. 2005. Spatial and temporal variability in biomass allocation in grassland ecosystems: a synthesis of field data. In annual ESA meeting held in Montreal, Canada, Oregon, 6-12 August 2005. Abstracts of the Ecological Society of America (oral).
        • Hui, D., Yiqi Luo, Shiqiang Wan, Tao Xu, Scott R. Saleska, Xuhui Zhou, Rebecca A. Sherry, Bo Su, and Linda L. Wallace. Evidence of decreased soil moisture sensitivity of soil respiration under warming in a tallgrass prairie. In AGU meeting held in San Francisco, CA, 12-17 December 2004. Abstracts of Eos, Transactions, American Geophysical Union, Vol. 85, No. 47, 2004 (oral).
        • Hui, D., Y. Luo, et al. 2004. Controls of seasonal and interannual variability in net ecosystem carbon exchange. In annual ESA meeting held in Portland, Oregon, 1-6 August 2004. Abstracts of the Ecological Society of America (oral).
        • Hui, D., Y. Luo, T. Xu,  S. Wofsy, D. Baldocchi, HP Schmid, G Katul, R Monson, A. Goldstein, P Curtis, D Hollinger. 2003. Contribution of Climatic variables to Seasonal and Interannual Variability in Net Ecosystem Exchange at Eight AmeriFlux Forest Sites. In AGU meeting held in San Francisco, CA, 5-12 December 2003. Abstracts of Eos, Transactions, American Geophysical Union, Vol. 84, No. 46, 2003.
        • Hui, D., T. Xu, Y. Luo, S. Wofsy. 2003. Quantitative assessment of climate effects on seasonal and interannual variabilities in net ecosystem exchange. In annual ESA meeting held in Savannah, Georgia, 3-8 August 2003. Abstracts of the Ecological Society of America, 160.
        • Hui, D., Y. Luo, G. Katul. 2003. Partitioning Interannual Variability in Net Ecosystem Exchange into Climatic Variability and Functional Change. In Chequamegon Ecosystem-Atmosphere Study (ChEAS) 2003 Meeting held in Woodruff, WI, June 29-July 2 2003 (oral).
        • Hui, D., S. Wan, B. Su, L. Wallace, Y. Luo. 2003. Does warming influence temperature sensitivity of soil respiration? Comparison of computation methods and experimental durations. In GCTE Workshop: Terrestrial Ecosystem Responses to Atmospheric and Climatic Change (TERACC) held in Lake Tahoe, CA, 27-30 April 2003.
        • Hui, D., Y. Luo, G. Katul. 2002. Partitioning Interannual Variability in Net Ecosystem Exchange into Two Causes -- Climatic Variability and Functional Change: Method Development with Dataset from Duke Forest .In AGU meeting held in San Francisco, CA, 15-19 December 2002. Abstracts of Eos, Transactions, American Geophysical Union, Vol. 83, No. 47, 2002.
        • Hui, D., Y. Luo, 2002. Evaluation of CO2 production and transport in the soil: Case study in Duke Forest. In annual ESA meeting held in Tucson, Arizona, 6-11 August 2002 (oral).
        • Hui, D., Y. Luo, G. Katul, D. Ellsworth, R. Monson, K. Wilson, S. Wofsy. 2001. Comparative study of canopy quantum yields among four AmeriFlux sites with different species and environmental conditions. In annual ESA meeting held in Madison, Wisconsin, 5-10 August 2001. 
        • Hui, D., Y. Luo, G. Katul. 2000. A search for a simple predictive model of gross primary productivity from eddy-covariance data. In annual ESA meeting held in Snowbird, Utah, 6-10 August 2000. 
        • Hui, D., Y. Luo, G. Katul. 2000. A search for a simple predictive model of gross primary productivity from eddy-covariance data. In AGU meeting held in San Francisco, CA, 15-19 December 2000. Abstracts of Eos, Transactions, American Geophysical Union, Vol. 81, No. 48, Nov 28, 2000.
        • Hui, D., D.A. Sims, D.W. Johnson, W. Cheng, J.S. Coleman and Y. Luo. 1999. Canopy water and light use efficiency at elevated CO2: A mesocosm study. In annual ESA meeting held in Spokane, WA, 8-12 August 1999. 
        • Hui, D., Y. Luo, W. Cheng, J.S. Coleman, D.W. Johnson, and D.A. Sims. 1998. Quantum yield, canopy development, and carbon fluxes in a mesocosm study. In annual ESA meeting held in Baltimore, Maryland 2-6 August 1998. 
        • Hui, D., Y. Luo, J.T. Ball, W. Cheng, J.S. Coleman, D.W. Johnson, D. Schorran, D.A. Sims, and L. Sotoodeh. 1997. ECOCELL study III: Interactive effects of canopy development and elevated CO2 on ecosystem carbon fluxes. In 3rd International IGBP-GCTE Workshop: Critical Assessment of the Response of Forest Ecosystems to Elevated Atmospheric Carbon Dioxide, Duke University, North Carolina, 10-13 October 1997.  

         

         

         

        Invited Talks 

         

        • Hui, D. 2017. Phosphorus dynamics in terrestrial ecosystems: Case studies with meta-data synthesis. Horticultural Research Institute, Shanghai Academy of Agricultural Sciences, Shanghai, June 1, 2017.
        • Hui, D. 2017. Phosphorus dynamics in terrestrial ecosystems: case studies & Manuscript writting. School of Agricultre and Biology, Shanghai Jiao Tong University. May 31, 2017.
        • Hui, D. 2017. Quantification of soil N2O emission in cornfields: From chamber to eddy flux measurements and modeling. College of Environments and Resources, Zhejiang A&M University, May 22, 2017. 
        • Hui, D. 2017. Phosphorus dynamics in terrestrial ecosystems: Case Studies. SouthChina Botanical Garden, Chinese Academy of Sciences, May 15, 2017.
        • Hui, D. 2017. How to write a scientific manuscript for publication. College of Agriculture, Yangzhou University, May 10, 2017.
        • Hui, D. 2017. P is for phosphorus: the most critical nutrient -- case studies of P dynamics in terrestrial ecosystems. Department of Biological Sciences, Tennessee State University, Feb. 24, 2017.
        • Hui, D. 2016. Effects of precipitation changes on switchgrass biomass and greenhouse gas emission. USDA CBG program PI meeting. Virginia Beach, VA, Sept. 20, 2016.
        • Hui, D. 2016. How to write a scientific manuscript and get it published. Quantification of soil N2O emission in cornfields. Horticultural Research Institute, Shanghai Academy of Agricultural Sciences, Shanghai, June 22, 2016.
        • Hui, D. 2016. Quantification of soil N2O emission in cornfields: An integrated approach. College of Forests, Henan Agricultural University, June 13, 2016. 
        • Hui, D. 2016. Quantification of soil N2O emission in cornfields. College of Agriculture, Yangzhou University, June 8, 2016. 
        • Hui, D. 2016. Quantification of soil N2O emission in cornfields: An integrated approach. College of Forests, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou, China, May 31, 2016.
        • Hui, D. 2015. Climate change and grassland ecosystems: Case studies of precipitation changes. June 2, 2015. Yangzhou University, China.
        • Hui, D, 2015. Global Change and Ecosystem Carbon Cycling: Case Studies of Precipitation Change. March 2015. Illinois State Water Survey (ISWS), University of Illinois at Urbana-Champaign. 
        • Hui, D. 2014. Crunching data for information: case studies in global change ecology, Invited by Prof. Don Hong at Middle Tennessee State University, April 11, 2014.
        • Hui, D. 2014. How to write a manuscript and get it published, College of Life Sciences, Henan University, China. March, 2014.
        • Hui, D. 2013. Impacts of Global Change on Grasslands and Forests. College of Agronomy, Yangzhou University. July 2013.
        • Hui, D. 2013. Climate change and terrestrial ecosystems. Biology Department Seminar. Tennessee State University, March, 2013.
        • Hui, D. 2012. Effects of Precipitation Changes and Agricultural Practices on Greenhouse Gases (CO2 and N2O) Emissions. Diversion of Environmental Sciences, Oak Ridge National Laboratory, July 9, 2012.
        • Hui, D. 2011. Impacts of Global Change on Terrestrial Ecosystem Services. International Center for Climate and Global Change Research, Auburn University, Oct. 5, 2011.
        • Hui, D. 2011. Impacts of global change on Terrestrial Ecosystems Carbon Cycling: an Overview of Different Approaches. Dr. Tao Zhou’s Research Group, Beijing Normal University, July 20, 2011.
        • Hui, D. 2011. Studies of Terrestrial Ecosystems Responses to Global Change: Now and Future. South China Botanical Garden, Chinese Academy of Sciences, June 25, 2011.
        • Hui, D. 2008. Meta-analysis: method for quantitative data synthesis. Dr. Shenglei Fu’s Research Group, South China Botanical Garden, Chinese Academy of Sciences, May 10, 2008.
        • Hui, D. 2008. Responses of Grassland and Forest Ecosystems to Global Change. South China Botanical Garden, Chinese Academy of Sciences, May 9, 2008.
        • Hui, D. 2007. Responses of grassland and forest ecosystems to global change. Tennessee State University, Nashville, 2007
        • Hui, D. 2007. Responses of grassland and forest ecosystems to global change. University of Southern Mississippi, Hattiesburg, 2007.
        • Hui, D. 2007. Terrestrial ecosystems carbon cycling and global change. University of New Orleans, New Orleans, 2007.
        • Hui, D. 2006. Responses of grassland and forest ecosystems to global change: Integrating experimental data into models. Virginia Tech University, Blacksburg, 2006.
        • Hui, D. 2006. Responses of grassland and forest ecosystems to global change: Integrated experimental and modeling approaches. University of Texas, Austin. 2006.
        • Hui, D. 2006. Terrestrial ecosystems carbon cycling and global change. Texas Tech University, 2006.
        • Hui, D. 2006. Responses of grassland and forest ecosystems to global change. University of Idaho, Moscow, 2006.
        • Hui, D. 2006. Global Change and Terrestrial Ecosystem. Southern Illinois University, Carbondale, 2006.
        • Hui, D. 2006. Experimental and Modeling Studies of Terrestrial Ecosystems Carbon Exchange. University of Illinois, Springfield, 2006.
        • Hui, D. 2006. Experimental and Modeling Studies of Terrestrial Ecosystems Carbon Exchange, University of Rutgers, Newark, 2003.
        • Luo, Y., D. Hui. 2003. Modeling/statistical Approaches to Interpret and Predict NEE in Forest Ecosystems. In NIGEC SouthCentral Regional Center Principal Investigator Workshop 2003 held in New Orleans, LA, 3-4 April 2003.

         

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webpage contact:
Dafeng Hui, Ph.D.