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The use of High Density Polyethylene (HDPE) lining in seepage prevention in dams was identified to reduce the cost of water storage. To make it acceptable to end users, it is necessary to determine its lifespan when exposed to tropical climates using viscoelastic models. The Findley Power Law was used to build a model for prediction of the material behaviour at elevated temperature in both short term and long term applications. Time-Temperature Superposition (TTSP) was also used to develop master curves for prediction of long term properties. Micrographs were presented to track the changes...

Eating harbits of people keeps on changing over time so to the climate, calling for new inovertive technologies to adress the situation. In Kenya intensive production of sweet potato is constrained by lack of improved varieties, pests, diseases and scarcity of land. In this study 11 improved sweetpotato varieties; Kemb10, SPK004, Mugande, Namaswakhe, K117, Polista, Bungoma, Odinga, 292-H-12, Zapallo and Nyathi Odiewo (Improved), were tested against 4 popular farmer varieties; Nyathi Odiewo (local), Jayalo, Amina and Kuny kibuonjo. The experiment model was mother and baby trial with farmers...