Refractive index modifications such as e. The invention further provides a portable electronic device and a method of manufacturing a liquid fuel reservoir. The cylinder and the pistons are independently cooled to reduce cylindrical deformation caused by thermal expansion during engine operation. The encoding system consults a back channel information manager to dynamically adjust encoding parameters. The object of the present invention is to reduce the amount of information when transferring a signalling message and thus save bandwidth. The first set of particles exhibit a color different from and contrasting to a color of the second set of particles, and also preferably a different charging property.