Ceylon Journal of Science (Physical Sciences); Volume 16, June 2012 S. R. Kodituwakku, S. Selvarajah and U. A. J. Pinidiyaarachchi Towards the Enhanced Features for Content Based Image Retrieval (1-8) S. P.K. Malaviarachchi Extremely High Rare Earth Element Partitioning into Clinopyroxenes of Mantle Peridotites (9-18) H.A.H. Jayasena Socio-technical Aspects of Water Management in Sri Lanka: The Past and the Present (19-30) D.P. Dias, C.B. Dissanayake, N.R. De Silva, R.Chandrajith, U.L.B. Jayasinghe and T.B. Nimalasiri Preliminary Investigations on the Hydrocarbon Potential of a Recently Discovered Black Shale Deposit in the North-East of Sri Lanka (31-36) P.U. Liyanage, S.K.Gunatilake and H.S.K.Fernando An Environmental Assessment of Solid Wastes at the Koggala Export Processing Zone in Sri Lanka (3745) R. Chandrajith, T. Ariyaratna and C.B. Dissanayake The Status of Cadmium in the Geo-environment of Sri Lanka (47-54) S. Karunaratne Enhancement of Learning Science at Primary Level through Collaborative Activities (55-64) P. Ekanayake, M. Iskandar, K. Tennakoon, L. C. Ming, V. N. Yoong, R. Zain, R. Senadeera, S. Yoshikawa Fabrication of Eco-friendly Dye Sensitized Solar Cells Using Pigments from Melastoma malabathricum L., a Native Plant in Borneo (65-70) Ceylon Journal of Science (Physical Sciences); Volume 17, June 2013 S. R. Kodituwakku, K. R. Wijeweera, M. A. P. Chamikara An Efficient Algorithm for Line Clipping in Computer Graphics Programming (1-8) U. A. J. Pinidiyaarachchi and K. R. Wijeweera An Efficient Convex Hull Algorithm for a Planer Set of Points (9-17) Namal Priyantha, Linda B.L. Lim, D.T.B. Tennakoon, Nur Hakimah Mohd Mansor, Muhd Khairud Dahri and HeiIng Chieng Breadfruit (Artocarpus altilis) Waste for Bioremediation of Cu (II) and Cd(II) Ions from Aqueous Medium (19-29) A.G.N.D. Darsanasiri, W.G. I. U. Rathnayake, Sanath Rajapakse and R.M.G. Rajapakse In-situ Deposition of Silver Nanoparticles of Different Colors on Cotton for Imparting Antibacterial and Antifungal Properties (31-39) Linda B.L. Lim, Namal Priyantha, D.T.B. Tennakoon, Chieng Hei Ing and Chandima Bandara Sorption Characteristics of Peat of Brunei Darussalam I: Characterization of Peat and Adsorption Equilibrium Studies of Methylene Blue - Peat Interactions (41-51) Ceylon Journal of Science (Physical Sciences); Volume 18, June 2014 A. Sutharsiny, H. Manthrithilake, S. Pathmarajah, M. Thushyanthy and M.Vithanage Seasonal variation of nitrate-n in groundwater: a case study from Chunnakam aquifer, Jaffna Peninsula (1-8) E. A. N. V. Edirisinghe, H. M. T. G. A. Pitawala, H. A. Dharmagunawardhane and R. L. Wijayawardane Isotopic variations in natural water and groundwater recharge conditions in the Kala Oya basin, Sri Lanka (9-16) S. W. Nawaratne and U.L.N.I. Liyanage Industrial applications of the minerals in the Matale area and its future trends A.R.M.S.P Ratnayake and A.N Navaratna Spectroscopic determination of metal impurities in commercial raw material fertilizer of Sri Lanka (2736) A. A. D. C. Alahakoon, S. R. Kodituwakku, J. Gunathilake Coordinate transformation tool for android mobile devices H.M.L.N.K Herath and J.V. Wijayakulasooriya A study on the effect of the neighbor phonemes in natural synthesis of speech Ceylon Journal of Science (Physical Sciences); Volume 19, 2015 H.A.H. Jayasena and P.B. Kulasekera Sustainable rain water harvesting system for rural community: a case study from Deduru Oya basin in Sri Lanka Chandima Weerakkody, Gayani Chathurika Pathiraja, Parakrama Karunarathne and Nadeeshani Nanayakkara Development of corrosion resistant composite coating with copper and zirconium Danushka Ekanayake and M.Y. Udugala-Ganehenege Water quality analysis to identify possible reasons for the unusual colour change of cooked rice in Indikolapelessa, Sri Lanka K. R. Wijeweera and S. R. Kodituwakku An algorithm to find the visible region of a polygon K. R. Wijeweera and S. R. Kodituwakku An algorithm to find the largest circle inside a polygon