This thirteenth volume in the series covering the latest results in the field includes abstracts of papers which have appeared since the publication of Annual Retrospective XII (Volumes 303-304). As well as the over 300 semiconductor-related abstracts, the issue includes the original papers: “Effect of KCl Addition upon the Photocatalytic Activity of Zinc Sulphide” (D.Vaya, A.Jain, S.Lodha, V.K.Sharma, S.C.Ameta), “Localized Vibrational Mode in Manganese-Doped Zinc Sulphide and Cadmium Sulphide Nanoparticles” (M.Ragam, N.Sankar, K.Ramachandran), “The Effect of a Light Impurity on the Electronic Structure of Dislocations in NiAl” (L.Chen, Z.Qiu), “Analysis of Finite Element Discretisation Schemes for Multi-Phase Darcy Flow” (D.P.Adhikary, A.H.Wilkins), “Theoretical Investigations of the Defect Structure for Ni3+ in ZnO” (Z.H.Zhang, S.Y.Wu, S.X.Zhang).