Abstract: A spine board for use in supporting a patient during emergency medical treatment comprising a pair of board joined together by a hinge. The hinge is provided with a latch which allows the board to be rigidly locked in a flat condition so as to provide rigid support for a patient receiving CPR or other treatment.

Abstract: In a computer system comprising a CPU, a cache memory and a main memory wherein the cache memory is virtually addressed, and some of the virtual addresses are alias address to each other, a cache memory controller comprising a cache control logic, a cache tag array, a memory management unit, and an alias detection logic is provided. The cache control logic skips flushing of a cache line if the cache line is corresponding to a memory block in a non-cacheable physical memory page, thereby avoiding unnecessary flushes and allowing the CPU to update the cache memory and the main memory using an improved write through and no write allocate approach that reduces cache flushes.

Abstract: The disclosure is of a projectile having a main body, a nose and a tail iuding a flared tail member, the projectile having its center of gravity close to the nose thereof.

Abstract: A system and method for calibrating amplifier gain and a comparator threshold for use in verification of magnetic media integrity in a magnetic data storage device. Commercially available read data processors are used which have an amplifier with controllable gain and a comparator with an internal indirectly-controllable threshold. An on-board voltage reference is provided for gain calibration. The calibrated gain is used to provide signals with known peak values for calibrating the comparator threshold. In one embodiment, the numeric control value for the threshold is reduced from a calibrated peak value to a specified fraction for media verification. In a second embodiment, the gain is reduced to the industry specified fraction and the threshold is calibrated to match peak signal magnitudes at the reduced gain. The gain is then returned to the calibrated level for media verification.

Abstract: An underwater sound generator comprising dual opposed pistons in a housing. Dynamic seal assemblies of flexible waterproof material are compressed against the peripheries of the pistons and the housing and form a watertight seal that allows axial motion. Controllers regulate the delivery of pressurized hydraulic fluid to hydraulic actuators which drive the axial motion of the pistons according to a predetermined variation.

Abstract: A fiber optic hydrophone for use as an underwater electroacoustic standard. The hydrophone includes a fiber optic acoustic wave detector in one end of the hydrophone which is subjected to incident acoustical waves. A similar fiber optic is in an acoustically isolated compartment where the optic fiber is not affected by the incident acoustical wave. Comparison of light passing through each coil will determine incidence of an acoustical wave on the detector fiber.