International Symposium on áNew Trends in the Photochemistry of Polymers' International Symposium on New Trends in Physics and Physical Chemistry of Polymers International Symposium on the Chemistry of Cement International symposium on the chemistry of cement International Symposium on Physics and Chemistry of Fission International Symposium on the Reactivity of Solids International Symposium on Advances in Ship Collision Analysis International Symposium on Sulfur in the Atmosphere International Symposium on the Fracture Mechanics of Ceramics International Symposium on Advances in Ceramic-Matrix Composites