î î î. block grants. categorical grant. commerce clause. cooperative federalism. devolution. elastic clause. federalism. line-item vote. mcculloch vs. maryland. necessary and proper clause. new deal. nullification. reapportionment. sovereign immunity. spending clause. supremacy clause. unfunded mandates.
The compression ratio is the ratio of the volume of the cylinder and the combustion chamber when the piston is at the bottom, and the volume of the combustion chamber when the piston is at the top. Automotive engineers can improve fuel efficiency and fuel economy by designing engines with high compression ratios.
The ratio of the volume of the first turns of the channel of the screw (at hopper end) to the volume of the last turn of the channel (at the die end) is known as the compression ratio. This ratio usually between 1.5:1 to 4:1 depending upon the material. Water cooling of the screw. 2  Screw cooling hardens the layer of polymer adjacent to the surface and reduces the effective channel depth. 3  Replacing all or part of the metering zone section of the screw with a smear head attached to and revolving with the screw.