A piston-pumped EGR system for an internal combustion engine includes first and second stationary regenerators. The variable resistance layer includes at least a tantalum oxide, and is configured to satisfy 0 <x<2. The codogenic gene segments are integrated into the genome of the plants. The removable components are preferably secured to or made integral with any of the side panels by structures, devices or materials by which the components are both structural; aesthetic, decorative or ornamental, yet also relatively easily detachable. The reinforcing elements, preferably cords, are incorporated in an elastomeric material and constitute at most the 40% of the volume of the fabric. A mixture of composite waste products and particulate solids is formed into solid products to create degradation resistant solid units which capture the particulate solids.