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D.Sc. in Applied Mathematics, University of Glasgow, (1981)

Ph.D. in Applied Mathematics, University of Glasgow, (1968)

M.Sc. in Applied Mathematics, Strathclyde University, (1965)

Other in Applied Mathematics, Royal College of Sci. & Tech., (1964)

Other in Applied Mathematics, Royal College of Sci. & Tech., (1964)

Research Interests

Integral transforms, Integral Equations, Elasticity, Acoustics, Radiation Transport

Articles

Mertens, C. J., Moyers, M. F., Walker, S. A. and Tweed, J. J. Proton Lateral Broadening Distribution Comparisons between GRNTRN, MCNPX and Laboratory Beam Measurements. Advances in Space Research.

Mertens, C. J., Walker, S. A., Wilson, J. W., Singleterry, R. C. and Tweed, J. J. (2007). Coupling of Multiple Coulomb Scattering and Energy Loss and Straggling in HZETRN. Advances in Space Research 40 , pp. 1357-1367.

Gerhold, C. H., Clark, L. R., Dunn, M. H. and Tweed, J. J. (2006). Investigation of Acoustical Shielding by a Wedge-Shaped Airframe. Journal of Sound and Vibration 294 (1-2) , pp. 49-63.

Wilson, J. W., Tweed, J. J., Walker, S. A., Cucinotta, F. A., Tripathi, R. K., Blattnig, S. and Mertins, C. J. (2005). A Procedure for Benchmarking for Laboratory Exposures with 1 A GeV Iron Ions. Advances in Space Research 35 (2) , pp. 185-193.

Tweed, J. J., Walker, S. A., Wilson, J. W., Cucinotta, F. A., Tripathi, R. K., Blattnig, S. and Mertens, C. J. (2005). Computational Methods for the HZETRN Code. Advances in Space Research 35 (2) , pp. 194-201.

Walker, S. A., Tweed, J. J., Wilson, J. W., Cucinotta, F. A., Tripathi, R. K., Blattnig, S., Zeitlin, C., Heilbronn, L. and Miller, J. (2005). Validation of the HZETRN Code for Laboratory Exposures with a 1 A GeV Iron Ions in Several Targets. Advances in Space Research 35 (2) , pp. 202-207.

Presentations

Mertens, C. J., Moyers, M. F., Walker, S. A. and Tweed, J. J. (July 13, 2008). Comparisons between HZETRN simulations and beam measurements of proton lateral broadening distributions 37th COSPAR Scientific Assembly Montreal, Canada.

Walker, S. A., Tweed, J. J., Wilson, J. W., Tripathi, R. K., Badavi, F. F., Miller, J., Zeitlin, C. and Heilbronn, L. H. (June 13, 2008). Validation of a Multi-Layer Green's Function Code for Ion Beam Transport 37th COSPAR Scientific Assembly Montreal, Canada.

Tweed, J. J., Walker, S. A., Wilson, J. W. and Tripathi, R. K. (February 10, 2008). Recent Progress in the Development of a Multi-Layer Green's Function Code for Ion Beam Transport Space Technology & Applications Forum-STAIF 2008 Albuquerque, NM.

Tweed, J. J., Walker, S. A., Wilson, J. W. and Tripathi, R. K. (September 18, 2007). A Multi-Layer Green's Function for Ion Beam Transport SPACE 2007 Conference Albuquerque, NM.

Tweed, J. J., Walker, S. A., Wilson, J. W., Tripathi, R. K., Badavi, F. F., Miller, J., Zeitlin, C. and Heilbronn, L. H. (July 9, 2007). Validation Studies of the GRNTRN Code for Radiation Transport SAE 37th International Conference on Environmental Systems Chicago, IL.

Tweed, J. J., Walker, S. A., Wilson, J. W., Tripathi, R. K., Badavi, F. F. and Cucinotta, F. A. (September 19, 2006). A Radiation Transport Code for Space and Laboratory Applications SPACE 2006 Conference San Jose, CA.

Tweed, J. J., Walker, S. A., Wilson, J. W., Tripathi, R. K., Cucinotta, F. A. and Badavi, F. F. (July 17, 2006). An Improved Green's Function Code for HZE Ion Transport SAE 36th International Conference on Environmental Systems Norfolk, VA.

Walker, S. A., Tweed, J. J., Wilson, J. W., Tripathi, R. K. and Cucinotta, F. A. (July 17, 2006). Steps Towards Developing a Multi-layer Green's Function Code for Ion Beam Transport SAE 36th International Conference on Environmental Systems Norfolk, VA.

Mertens, C. J., Walker, S. A., Wilson, J. W., Singleterry, R. C. and Tweed, J. J. (July 16, 2006). Coupling of multiple coulomb scattering and energy loss and straggling in HZETRN 36th COSPAR Scientific Assembly Beijing, China.

Wilson, J. W., Cucinotta, F. A., Tripathi, R. K., Heinbockel, J. H., Tweed, J. J., Mertens, C. J., Blattnig, S. and Zeitlin, C. (July 16, 2006). NASA radiation protection research for exploration missions 36th COSPAR Scientific Assembly Beijing, China.

• 2004: NASA Certificate of Appreciation for Exceptional Contributions to the International Space Station Radiation Shielding Team, NASA
• 1981: Fellow of the Institute of Mathematics and It's Applications,
• 1981: Fellow of the Royal Society of Edinburgh,
• 1981: Jack Prize, University of Glasgow
• 1964: Brown Prize, Royal College of Sciences and Technology