Husna Abd. Rahman

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Lightweight composite material is more preferable than metal and metal alloys in engineering applications however uncertainty in its failure prediction hinder widespread usage. Vibration response as damage detection is widely used however its usage on composite material is very restricted due to its nonlinear and non homogenous property. This paper attempts(More)
Although diffractive contact lenses have been well documented in theory, no definitive experimental data have been reported which confirm that the near image is in fact created by diffraction rather than by refraction. We have tested the diffraction hypothesis for one type of diffractive contact lens (the Hydron Echelon bifocal) experimentally by measuring(More)
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