K. G. A. H. Amarasena’s scientific contributions

Poly bag manufacturing entrepreneurs face many challenges due to frequent fluctuation and continuous increasing trend of material prices of poly bags. Further legal restrictions imposed on some types of polythene products made the situation aggravated. With the purview of optimizing the poly bag manufacturing process, authors attempted to model and simulate the poly bag manufacturing process in the light of posed challenges. This paper presents a modeling method and a simulation study of a poly bag manufacturing system.

Ergonomically designed chairs are important for long time seated workers to increase their productivity and also to reduce low back injuries due to use of poorly designed chairs in ergonomic aspects. In addition, ergonomically designed chairs increase the seating comfortability of the chair users. Most of the chairs designed for the long time seated workers are not considered the full ergonomic aspects. In this paper, we discuss a design of an ergonomically efficient chair for the long time seated workers to increase their productivity and also to reduce low back injuries.

New innovate design of rotational type heat exchanger is proposed. It has ability to work in diverse heat transfer environment, ability to increase heat transfer area and promote turbulent flow. It is self cleaning heat exchanger with easy access for further cleaning of heat transfer element and has easy expandability of the capacity by addition of separate heat exchanger units.

Ergonomically designed chairs are important for long time seated workers to increase their productivity and also to reduce low back injuries due to use of poorly designed chairs in ergonomic aspects. In addition, ergonomically designed chairs increase the seating comfortability of the chair users. Most of the chairs designed for the long time seated workers are not considered the full ergonomic aspects. In this paper, we discuss a design of an ergonomically efficient chair for the long time seated workers to increase their productivity and also to reduce low back injuries.