Sabbatical Leaves, Study visits & Conferences:
- American Mathematical Society Joint Mathematics Meetings, January 1986, New Orleans, Louisiana, USA.
- American Mathematical Society Joint Mathematics Meetings, January 1987, San Antonio, Texas, USA.
- Texas PDE Conference, March 5-7 1989, University of Houston, Texas, USA.
- Texas PDE Conference, March 1990, University of Texas at Arlington, USA.
- American Mathematical Society Joint Mathematics Meetings, January 1991, San Francisco, California, USA.
- American Mathematical Society Joint Mathematics Meetings, January 8-12, 1992, Baltimore, Maryland, USA. Presented the talk entitled: Uniqueness and stability of solutions for semipositione problems in a ball.
- American Mathematical Society Joint Mathematics Meetings, January 13-16,1993, San Antonio, Texas, USA.
- American Mathematical Society Joint Mathematics Meetings, January 12-15, 1994, Cincinnati, Ohio, USA.
- Third SIAM Conference on Mathematical and Computational Issues, February 8-10, 1995, San Antonio, USA.
- Sabbatical Leave from Sept. 1995 to Sept. 1996, University of North Texas.
- Second International Workshop on Transform Methods and Special Functions, II, August 23-30, 1996, Varna, Bulgaria. Title of the talk presented: Some properties of finite laplace transform".
- Thirteenth Annual Conference on Applied Mathematics. February 21-22, 1997, University of Central Oklahoma, USA.
- II Pan American Workshop in Applied and Computational Mathematicals, September 8-11, 1997, Gramado, Brazil. Title of the talk presented: Solution of a class of Integro-differential equations by fractional calculus.
- The Fifth International Conference on Integral Methods In Science and Engineering IMSE98, August 10-13, 1998, Houghton, Michigan, USA. Title of the talk presented: A time dependent model for the transport of heavy pollutants from ground-level aerial sources.
- 20th World Conference on the Boundary Element Method BEM 20, August 19-21, 1998, Orlando, Florida, USA.
- Joint Mathematics Meetings, January 13-16, 1999, San Antonio, Texas, USA.
- International Conference for Scientific Computations, March 15-17, 1999, Beirut, Lebanon. Title of the talk presented: A Solution of Heuns equations by fractional calculus.
- The Second Congress ISAAC 1999, August 16-21, 1999, Fukuoka, Japan. Title of the talk presented: A time dependent model for the transport of heavy pollutants from ground-level aerial sources.
- Second International Conference on Boundary Value Problems, Integral Equations and Related Problems, August 11-14, 1999, Beijing and Chengde, Bebei, China. resented the talk entitled: Differential equations related to pollution problems.
- First International Conference on the Integration Dynamics, Monitoring and Control DYMAC 1999, September 1-3, 1999, Manchester, U.K. Title of the talk presented: A fractional operators approach to doubly confluent Heun and generalized ellipsoidal wave equations".
- Joint Mathematics Meetings, Washington DC, January 19-22, 2000, USA. Title of the talk presented: Arbitrary order linear ordinary differintegral equations with polynomial coefficients.
- Mathematical Challenges of the 21st Century, University of California, August 7-12, 2000, USA.
- Brno Colloquium on differential and Difference Equations, (Brno CDDE 2000) Brno, 5-8/9/2000, Czech Republic. Title of the talk presented: An extension of the Laguerre polynomials and associated orthonormal functions.
- The Statistics In Functional Genomics Conference, June 10-14, 2001, USA. Title of the talk presented: A generalized Inverse Gaussian distribution with ?-confluent hypergeometric function.
- 2001 Canada-China Math Congress, Vancouver, August 20-23/2001, Canada. Title of the talk presented:: Operational calculus approach to PDE arising In OR-Regularization of Ill-posed problems".
- American Mathematical Society Joint Mathematics Meetings, January 2002, USA.
- International Conference on Nonlinear Partial Differential Equation-Theory of Approximation, City University of Hong Kong, 29/8-2/9/2002, Hong Kong. Title of the talk presented: Solutions of fractional multi-order differential equations using poisson-type transform as transmutation operator.
- First Yamabe Memorial Symposium, University of Minnesota, September 18-24, 2002. Minnesota, USA.
- Workshop on the calculus of variations: Geometric problems, superconductivity and material microstructures, Fields Institute. 23-31/8/2003, Toronto, Canada. Title of the talk presented: A partial differential equations related to a problem of atmospheric pollution.
- International Congress "Massee 2003) Mathematical Society of South Europe, Borovetz, Bulgaria, 15-21/9/2003. Title of the talk presented: "Unified form of gamma-type and inverse Gaussian distributions".
- International Meeting on New direction in Probability Theory, Canada 6-7/8/2004.
- 3rd International Conference on boundary integral methods theory and applications, Reading, UK. 14-18/9/2004. Title of the talk presented: "On a class of linear integro-differential equations by fractional calculus"
- Kuwait Fund Lectures at Cambridge University, U.K. 3/5/2005.
- International symposium in Analytic Function Theory, Fractional Calculus and their Applications in honour of Prof. H.M. Srivastava on his 65th birthday, University of Victoria, Canada, August 22-27, 2005. Title of the talk presented: "On a class of linear integro-differential equations by fractional calculus".
- Third International Workshop meshfree Methods for Partial Differential Equations, University of Bonn, Bonn, Germany, 12-15/9/2005. Title of the talk presented: "A partial differential equation related to atmospheric pollution".
- Workshop on Mathematical and Computational Neuroscience, 13-14/8/2006, Queensland, Australia.
- International Conference on Applied analysis and Differential Equations, 4-9/9/2006, Iasi, Romania. Title of the talk presented: "Generalized Samudu transform and its use to solve differential equations".
- The 32nd Sapporo Symposium on Partial Differential Equations, 24-26/8/2007, Hokkaido Japan.
