1. H¹-Galerkin methods for a highly nonlinear Dirichlet problem using subspaces without boundary conditions, (30 minutes) in Varahmihir Memorial National Conference on Functional Analysis and its Applications held in Vikram University, Ujjain (24-28, September'83).


2. 45 minutes invited talk on Semigroup theoretic approach to partial differential equations in the Indian Science Congress held in Baroda (3-8 January'92).


3. Industry and IIT Linkage: Mathematical Perspectives -(1 hour) in the 4th Annual Conference of ISIAM, held in Jamia Milia, New Delhi (6-8^th April'96).


4. Enhanced Oil Recovery in Reservoir Study: Some Computational Issues (30minutes) in the National Conference on Numerical Schemes and Qualitative Properties of Solutions of Differential Equations and Wavelet Analysis in the Silver Jublee Conference of Orissa Mathematical Society (Jan. 23-25'98), held in Utkal University, Bhubaneswar.


5. Enhanced Oil Recovery in Reservoir Study: Some Computational Issues- (one hour invited lecture) in the Workshop on the Partial differential Equations, held in the State University of Maringa, Brazil (June 4-5, 1998).


6. One hour Invited Bama Charan Das Memorial talk on Industrial Mathematics : Key to Key Technologies and its Impact on Research and Education in Mathematics (in the National Conference on `Recent Trends in Mathematics & Computing' and 27th Annual Conference of Orissa Mathematical Society (March 11-12th '2000), held in Utkal University,Bhubaneswar.


7. Key Note Address on Role of Mathematics in Engineering and Technology in the 30th Orissa Mathematical Society and National Conference on Role of Mathematics in Engineering and Technology (Orissa) during 22nd to 23rd February'03.


8. Professor Rama Nath Mohanty Memorial Lecture entitled `Navier-Stokes Equations: A Million Dollar Open Problem' in the 30th Orissa Mathematical Society and National Conference on Role of Mathematics in Engineering and Technology (Orissa) during 22nd to 23rd February' 03.


9. Resource Person fro the UNESCO Sponsored Workshop on Industrial Mathematics, department of Applied Mathematics, MS University, Baroda during 1-7, Dec.'03.


10. Professor Sankar Prasad Mishra Memorial Lecture on How to Compute a Fair Price for an Option derivative in Financial Market: A Case Study and Its Mathematical Implications in the 31st OMS Conference held in the Institute of physics, Bhubaneswar during 7th to 8th February'04.


11. One hour talk on Industrial mathematics: Key to Key Technologies in the UGC sponsored conferences on 'Surprises in mathematics and Their Applications' held in Vivekanand College, chembur during January 17, 2005.


12. One hour talk on Discontinuous Galerkin Methods for Elliptic PDE's in the National Symposium on Scientific Computing with Application to partial Differential Equations during November 19-21, 2005.


13. One hour talk on Navier Stokes Equations: a Million Dollar Open Problem, and two hour talk on How to Compute a Fair Price in an American Option:A case Study in the National seminar on Partial Differential Equations and Scientific Computing held in Veer Narmad South Gujarat University, Surat during January 23-25, 2006.