“Investigation of Stability of caffeine dimer in water clusters: A quantum mechanical study”, Gayani Nadeera Pallewela, Samantha Weerasingheand Dhammika Dissanayake, Annual Research Symposium, Sri Lanka, University of Colombo, June 28 2011

“Investigating the local microstructure of solutions”, Elizabeth A. Ploetz, Samantha Weerasinghe and Paul Smith, 241^st ACS National Meeting & Exposition March 27-31, 2011, Anaheim, California, USA.

“Molecular Mechanics Force Field for Caffeine and Study of Hydrophobic Interaction” Samantha Weerasinghe Presented at the Physical Chemistry seminar series, Department of Chemistry, Kansas State University, Manhattan, KS 66506, U.S.A., March 09, 2010.

“New molecular mechanics force field for caffeine: A molecular dynamics simulation study”, Rangana Sanjeewa and Samantha Weerasinghe, 65^th annual sessions of Sri Lanka Association for the advancement of science, Sri Lanka, University of Kelaniya, December 07-11, 2009

“Investigation of the most probable structure for caffeine dimer: An ab initio study”, Indhika Jayasinghe and Samantha Weerasinghe, 65^th annual sessions of Sri Lanka Association for the advancement of science, Sri Lanka , University of Kelaniya, December 07-11, 2009

“Investigation of the effects of chemical denaturing agents on hydrophobic interaction by molecular simulation” Rangana Sanjeewa and Samantha Weerasinghe, 6th lecture series of the Graduate School of Chemical and Molecular Sciences CMSZH at the University of Zurich, Switzerland, May 2009

“Investigation of structure and properties of Cu_n (n=2-6) clusters using density functional theory methods”, A.N. Madusanka, Samantha Weerasinghe, 65^th annual sessions of Sri Lanka Association for the advancement of science, Sri Lanka , University of Kelaniya, December 07-11, 2009

“Investigation of accuracy of molecular mechanics force field of dimethyl sulfoxide (DMSO): A molecular simulation study”, Dilini Vithanage and Samantha Weerasinghe, 65^th annual sessions of Sri Lanka Association for the advancement of science, Sri Lanka, University of Kelaniya, December 07-11, 2009

“Development of new molecular mechanics force field for caffeine” Rangana Sanjeewa and Samantha Weerasinghe, NSF Annual Review Session, NSF Auditorium, Colombo, Sri Lanka May 2009

“Unimolecular dissociation kinetics of rare gas clusters: A comparison of molecular simulation results with dissociation rate theories”, S.D. Kumarage and Samantha Weerasinghe, 63^thannual sessions of Sri Lanka Association for the advancement of science, Sri Lanka, Open University, Nawala, Nugegoda, December 05-08, 2007.

“Molecular Modeling: Scientists competing with nature”, Samantha Weerasinghe Presented at the seminar series on “The Search for drugs”, PPGL Siriwardane Auditorium, Institute of Chemistry, Ceylon, February 3, 2006.

“Kirkwood-Buff Derived Force Fields for Molecular Simulations” Samantha Weerasinghe Presented at the Physical Chemistry seminar series, Department of Chemistry, Kansas State University, Manhattan, KS 66506, U.S.A., September 02, 2003.

“A Kirkwood-Buff derived force field for Urea/Water mixtures.” Paul E. Smith and Samantha Weerasinghe presented at the Computational Chemistry Gordon Conference, Colby-Sawyer College, New London, NH, U.S.A., June30-July 05, 2002.

“Calculation of the solvation energy of benzene in a non-polar solvent: A molecular dynamics study.” S. Weerasinghe presented at the 54th annual sessions of Sri Lanka Association for the advancement of science (1998).

“Development of a new functional form for the interaction energy of inert gases”, C. Magamage & S. Weerasinghe, presented at the 53rd annual sessions of the Sri Lanka Association for the advancement of science (1997).

“Structure and Stability of Triplex DNA in salt water solution: A Simulation study”, S. Weerasinghe , Dept. of Chemistry, University of Colombo, April 1996.

“Dynamics of triple helical DNA in salt water solution: A MD simulation study”, The center for Biotechnology, S. Weerasinghe, and B.M. Pettitt, Bayler College of Medicine, The Woodlands, Texas, U.S.A., March 1994.

“Structure and Stability of DNA triple-helix in salt water solution: A MD simulation study”, S. Weerasinghe, Y.K. Cheng, P.E. Smith and B.M. Pettitt, poster paper presented at the 4th Annual Retreat on W.M. Keck center for Computational Biology, Houston, TX, November 1993.

“MD Simulation at Constant Chemical Potential”, S. Weerasinghe, and B.M. Pettitt Texas Center for Advanced molecular Computation, University of Houston, Houston, TX 77204, U.S.A. November 1993.

“Calculating the Density of States of very Anharmonic Systems: Application to the evaporation of Argon Clusters”, F.G. Amar and S. Weerasinghe, International Symposium on the Physics and Chemistry of the Finite Systems: From Clusters to Crystals, Virginia Commonwealth University, Richmond, Virginia, U.S.A., October 1991.

“Unimolecular Dissociation Dynamics of Clusters: Testing Statistical Rate Theory against Simulations”, S. Weerasinghe and F.G. Amar, Atlantic Theoretical Chemistry Symposium, University of Maine, Orono, ME 04469, U.S.A. May 1990.

“Is Cluster evaporation Statistical? A comparison of Simulation Results for Ar13 with Exact Classical Phase Space Theory”, F.G. Amar and S. Weerasinghe, poster paper presented at 5th International Symposium on Small Particles and Inorganic Clusters (ISSPIC5) Konstanz, Germany, September 1990.

“Application of the Quaternion Algorithm for the simulation of rigid body motion to a Model of sp2 Hybridized Carbon Clusters”, S. Weerasinghe and F.G. Amar, Atlantic Theoretical Chemistry Symposium, Dalhousie University, Halifax, Canada, May 1989.

“Finite Temperature Dynamics of Carbon Clusters”, S. Weerasinghe and F.G. Amar, poster paper presented at 18th Northeast Regional Meeting of American Chemical Society, July 1988.

“Approaches to Carbon Cluster Dynamics” S. Weerasinghe and F.G. Amar, Atlantic Theoretical Chemistry Symposium University of New Brunswick, Canada, May 1988.