AFrench company has introduced a new system to control the cracking of road surfaces. Called Prefis, and built by S2C INDUSTRIE of Angers, the system consists of an arm that makes transverse furrows at fixed intervals in the gravel substrate. At the same time, it injects a bitumen emulsion binder into the furrow. The transverse "precracks" prevent cracks from propagating upward out of the roadbed and into the road surface. The hydraulically controlled arm comes with a vibrating tool and spray nozzle mounted at the front of the system's tractor. The system's hydraulics, binder reservoir, compressor, and generator mount on the rear of the carrier. All are controlled from the driver's seat via a programmable logic controller. Prefis can produce furrows up to 5m (16.4 ft) in width and 32 cm (12.6 inches) in depth. At the rate of one furrow per 10 ft, it can deliver two joints per minute, equal to about 1,200 ft per hr. The French civil engineering research center (LCPC), developed the system. FAX +33 2 41 43 81 23.
One way to keep a Formula One racing team moving at breakneck speed in the pit and at the test facility is to bring CAD drawings of the racing vehicleís parts down to the test facility and even out to the track.
Most of us would just as soon step on a cockroach rather than study it, but thatís just what researchers at UC Berkeley did in the pursuit of building small, nimble robots suitable for disaster-recovery and search-and-rescue missions.
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