A fluid flow meter estimates the velocity of water or another fluid flowing through pipe by comparing measurements of the water velocity to one or more pre-determined templates. A device for measuring the centricity of a conductor in an insulating casing includes an inductive measuring apparatus, first and second optical measuring apparatus and an evaluation apparatus. The residual stress discontinuity at an interface between the core and the clad is 20. The roll bar is operatively connected to the truck box and is rotatably movable between the first and second longitudinal sides of the truck box, which enables the tarp to close or open the truck box. Structures may be produced by UV lithography that have a sidewall quality that has previously been attainable only by photolithography with a collimated x-ray source. A coding mode and a motion vector for a macroblock in a QCIF video sequence are selected from those of a corresponding CIF video sequence without motion estimation.