Stiff Delay Differential Equations in Biosciences, 4th International Workshop on Analysis and Numerical Approximation of Singular Problems (IWANASP 2011), Chester, UK, 7-9 September 2011.

 An Efficient Numerical Technique for Stiff Delay Differential Models in Biosciences, 16th International Conference on Mathematical Modeling and Analysis (MMA2011), Sigulda, Latvia, May 25-28, 2011.

 Delayed SIR Epidemic Model With Swine Influenza, 9th UAE Math Day, UAE, April 2011.

Delay differential equations with infectious diseases, First International workshop on Differential and Integral Equations with Applications in Biology and Medicine (DIEBM 2010), Aegean University, Karlovassi, Samos island, Greece, September 7-10, 2010.

 Sensitivity of Best-Fit Parameters in Delay Differential Models with Cell Growth Dynamics, International Conference-2010: The 6th Dynamical Systems and Applications, Antalya, Turkey July 10-14, 2010.

 Delay Differential Models in Dynamic Diseases, 2nd International Conference on Bioinformatics and Computational Biology
(BICoB-2010), Honolulu, Hawaii, USA, March 24--26, 2010.

 Numerical Treatments of DDEs in Dynamic Diseases, 8th USE Math Day, April 2010, Zayed University, UAE.

 Assimilation of Dopplar Radar Winds Into a High Resolution Atmospheric Model, International Conference on Renewable Energy: Generation and Applications (ICREGA'10), Al-Ain, UAE University (UAE), 7--10 March 2010.

Variational Methods for Sensitivity Analysis of Neutral Delay Differential Models, International Conference of Numerical Analysis and Applied Mathematics (ICNAAM 2009), Crete, Greece, 18-22 September 2009.

 Delay Differential Equations in Immunology and Infection Diseases, 10th Annual UAEU Research Conference, UAE, April 13-16, 2009.

 Sensitivity and robustness of delay differential models in cell growth dynamics, One Day Conference in Cairo University 17 April 2008.

 Delay Differential Equations in Biosciences, ICMTD 2007 Conference, Cairo, Dec. 27-30, 2007.

 Mono-Implicit RK method for Delay Differential Equations ICMTD 2007 Conference, Cairo, Dec. 27-30, 2007.

 Assimilation of Doppler radial winds into 3D-Var data assimilation systems ICMTD 2007 Conference, Cairo, Dec. 27-30, 2007.

 Data Assimilation and Numerical Weather Prediction, One Day Conference: Mathematical Methods, (Minia University, Egypt) 20 March 2007.

 Solutions Of Some Non-Anticipative Equations In Modelling, Second International Workshop on Analysis and Numerical Approximation of Singular Problems (Samos Greece), 6--8 Sept. 2006.

Numerical treatments for delay parabolic partial differential equations, International Conference on Mathematical Analysis and Its Applications ICMAA06, (Assuit,
Egypt) 3--6 January 2006.

 Impact of Assimilation of Doppler Radial Velocity on a Variational System and on its Forecasts, 32nd Conference on Radar Meteorology/11th Conference on Mesoscale Processes, (Albuquerque, NM, USA) 24-29 October 2005.

Assimilation of radar data in the Met Office mesoscale and convective scale forecast systems, 32nd Conference on Radar Meteorology/11th Conference on Mesoscale Processes, (Albuquerque, NM, USA) 24-29 October 2005.

 On the impact of assimilating Doppler radar wind data into an operational numerical weather prediction model, 6th Int. Conference on Hydrological Uses of Radar, Melbourne, Australia, 2-4 February, 2004.

 Errors in Doppler radial winds and their incorporation into 3D-Var data assimilation systems, UWERN Annual Conference (Salford University, Manchester, UK) 13--15 December 2004.

Assimilation of Doppler radial winds into a high resolution NWP model, Workshop: High resolution data assimilation: towards 1-4km resolution, (Met Office, Exeter, UK) 15--17 November 2004.

 On the assimilation of Doppler radial winds into a high resolution NWP model, Third European Conference on Radar in Meteorology and Hydrology (ERAD)} (Visby, Island of Gotland, Sweden), 6-10 September 2004.

Data assimilation and Numerical Weather Prediction, New Frontiers in Computational Mathematics: Inverse Problem, (University of Manchester, UK), 10-11 Jan. 2004. \item
Four-dimensional data assimilation for forecast models, Royal Meteorological Society (RMS) Conference 2003, (University of East
Anglia, Norwich, UK), 1-5 September 2003.

 Data assimilation and associated issues, Workshop on mathematical techniques for improving forecasting of hazardous weather, (University of Reading, UK), 16--20 June 2003.

Computational solution of parabolic partial differential equations with time-lag, Innovative Time Integrators for PDEs (Amsterdam, The Netherlands), 25--27 November 2002.

Numerical stability regions for neutral/ delay differential equations, LMS supported One Day Meeting in Delayed Differential Equation (Liverpool, UK), 12th March 2000.

Numerical modelling with delay differential equations in cell growth: A talk in the Minisimposium at ICIAM99, the Fourth International Congress on the Industrial and Applied
Mathematics} (Edinburgh, UK), 5-9 July 1999.

Numerical treatment of parameter identification in delays differential equations: A talk in the Minisimposium at FoCM'99, Foundation of Computational Mathematics} (Oxford, UK),
18-28 July, 1999.

Sensitivity analysis of models described by delay differential equations: A talk in the Minisimposium at SciCADE99, International Conference on Scientific Computation And
Differential Equations (Queensland, Australia), 9-13 August, 1999.