Abstract: A vehicle arresting system includes a base layer comprising a crushable aggregate and a cover layer comprising a cementitious material having an oven-dry density of 100 lb/ft3 or less. The system also may include an arrestor bed and a plurality of anchors. Each anchor includes a support rod coupled to an associated puck, each support rod being secured to a foundation that supports the arrestor bed, and each puck being embedded in the cover layer slab of the arrestor bed. Additionally, each support rod is coupled to its associated puck via a shear link breakable at a predetermined load.

Abstract: In a method of electronically measuring reader/writer offset in a tape drive head, a plurality of sequentially adjacent data tracks are written on a tape with a write head. Error rate information is measured while reading a data track of the plurality of sequentially adjacent data tracks with a read head of the tape drive. A bathtub shaped curve is built from a set of the error rate information which is accumulated by reading the data track at a plurality of offsets of the read head relative to the data track. Offset of the read head relative to the write head is measured by determining an offset of the read head which correlates to a magnetic center of the data track as represented by a center point between edges of the bathtub shaped curve.

Abstract: In a method of electronically measuring reader/writer offset in a tape drive head, a plurality of sequentially adjacent data tracks are written on a tape with a write head. Error rate information is measured while reading a data track of the plurality of sequentially adjacent data tracks with a read head of the tape drive. A bathtub shaped curve is built from a set of the error rate information which is accumulated by reading the data track at a plurality of offsets of the read head relative to the data track. Offset of the read head relative to the write head is measured by determining an offset of the read head which correlates to a magnetic center of the data track as represented by a center point between edges of the bathtub shaped curve.