31. Early air-cooled ohv BMW flat-twin motorcycle engines have had OHC valve actuation . 32. Cherry switches have a lifespan of up to 50 million actuations , depending on switch type. 33. The rudder actuation system also drives the full-time mechanical nosewheel steering for ground operations. 34. This feature is now spreading to mainstream vehicles, using electrical motors rather than hydraulic actuation . 35. The actuation mechanism is simply a piston and cylinder, similar to a small pneumatic ram. 36. Microsystems are miniaturized silicon devices which perform non-electronic functions, typically sensing and actuation . 37. High-frequency actuation is possible. 38. It also is to be equipped with an Electrical Thrust Reverser Actuation System ( ETRAS ). 39. The development of efficient rigid chain actuators broadened the use of chain actuation for industrial applications. 40. He is the coauthor of seven patents, mostly in the area of smart material actuation .
