Presentations at Conference and Workshop:

1. 38th Sanibel Symposium, St. Augustine Florida, Feb. 22-27, 1998,

   Chain-Length and Geometry Dependence of NLO Properties of D-A Molecules: An ab initio TDHF study

2. National Educational & Technological Services: Program of Title 1; Federal Law P.L 103-382 " Improving America's School Act ", at Rotary Club, Arecibo Puerto Rico, March 21, 1997.

3. 8^th AAAS & EPSCoR Annual Meeting at Ponce Hilton Hotel, May 24-25, 1996.

   Monte Carlo Simulated Annealing Studies for the Solvation of Lithium Fluoride Ion Pairs in Water Clusters using Ab Initio Method.

4. 31^st ACS Junior Technical meeting, and 16^th Puerto Rico Interdisciplinary Scientific meeting, Arecibo Campus, University of Puerto Rico, March 9, 1996 ( Participated as moderator in one of the session).

5. Symposium: Innovation Teaching and Assessing Introductory Chemistry Courses; Inter American University of Puerto Rico, Feb. 24, 1995( Attended).

6. 208 ACS National Meeting, Washington DC, Aug. 21-25, 1994.

   Ab initio Monte Carlo Simulated Annealing Study of the Structure and properties of Hydrogenated Lithium Clusters.

7. 29^th ACS Junior Technical meeting, and 14^th Puerto Rico Interdisciplinary Scientific meeting, Mayaguez Campus, University of Puerto Rico, March 4, 1994; Ab initio Monte Carlo Simulated Annealing Study of the Equilibrium Structure of Hydrogenated Lithium Clusters.

8. 17^th Senior Technical Meeting, ACS, Puerto Rico Section, Humacao, Puerto Rico, Nov. 4-6, 1993.

   Ab initio Hartree-Fock and CAS MCSCF Calculations on the ground and ²A" and Exited ²A' Potential Energy Surfaces of FSO radical.

9. 22^nd Northeast Regional Meeting of ACS, Syracuse University, NY. June 21-24, 1992.

   Nonlinear Optical Properties of Some Novel Thiophene Derivatives: an Ab initio Time-Dependent Coupled Perturbed Hartree-Fock Study.

10. Workshop on Computational Chemistry and Nonlinear Optical Materials, Wright-Patterson Air Force Base, Ohio. May 18-20, 1992.

    Theoretical Modeling of NLO Materials by First-Principal Quantum Chemical Methods.

11. Secondo Convengo Nazionale di Chimica Fisica, Ambientale, Siena, Italy. Nov. 8-12, 1990;

    Quantum Chemical Studies of Atmospheric Molecules.

12. 24^th Congresso Nationale di Chimica Fisica, Maratea, Italy. Oct. 8-12, 1990.

    Ab initio Ro-vibrational Calculation for NO₂ X/A States.

13. Workshop on Computer Chemistry, Trieste, Italy, Sept. 17-18, 1990.

    Ro-vibronic Software for Triatomics.

14. Conference on Lasers in Chemistry, Trieste, Italy. June 11-15, 1990 (attended).

15. International Conference on NQR Spectroscopy, IIT Kanpur, India, Jan. 11-15, 1988.

    Ab initio MO Calculations of Nuclear Quadrupole Coupling Constants of ²H, and ¹⁷O Nuclei in Water Molecule.

16. National Workshop on Computer Aided Instructions in Chemistry, Banaras Hindu University, Varanasi, India. Oct. 7-17, 1987 (Laboratory Instructions).