In this work, novel hybrid Fresnel lenses for infrared (IR) optical applications were designed and fabricated. The Fresnel structures were replicated from an ultraprecision diamond-turned aluminum mold to an extremely thin layer (tens of microns) of high-density polyethylene polymer, which was directly bonded onto a flat single-crystal silicon wafer by press molding without using adhesives. Night mode imaging results showed that the fabricated lenses were able to visualize objects in dark fields with acceptable image quality. The capability of the lenses for thermography imaging was also demonstrated. This research provides a cost-effective method for fabricating ultrathin IR optical components.

This research focuses on the importance of ownership structure as a determinant of risk disclosure. It is expected to contribute to the literature particularly in the Malaysian context, where risk disclosure practice is in the infancy stage. This study uses multiple regressions in assessing the variability of the extent of risk disclosure. The overall results confirm that highly concentrated ownership would lead to high agency problem, which then leads to less disclosure. This implies that, to promote greater transparency in countries where many of the large listed companies are family-owned, more stringent laws that mandates adequate risk disclosure is clearly warranted. This would ensure that the needs of all stakeholders are properly met.

Thin walled plastic parts are subjected to warpage after injection. Warpage can be overcome by the ribs features. This experimental project is to design a honeycomb ribs replacing the normal ribs to overcome part warping. The parameters included ribs height, the ribs thickness and the honeycomb size. Finite Element Analysis (FEA) simulations for each honeycomb ribs design are analyzed with Autodesk Moldflow Insight software and the part which result the worst warping value, part with medium warping value and part with less warping value were chosen to validate them by fabricating the core and cavity inserts to produce the actual product. The part warping is measured and then compared with the data from the simulation. Thus, the best design parameter of honeycomb ribs is identified.

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