By Scientific American
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Additional info for How Things Work (Scientific American Special Online Issue No. 32)
Example text
In a patrol car that is cruising with traffic, however, the moving gun determines relative speed between the car and a target, and any angle may artificially add to the speed reading. Officers are trained to check the gun’s displayed patrol speed against their own car’s speedometer. OUTGOING WAVE INCOMING WAVE HEAD-UP DISPLAY DID YOU KNOW ... DIGITAL DISPLAY OUTGOING PULSE LASER DIODE SPEEDING PALM TREE A 1979 Miami TV report showing a radar gun clocking a palm tree at 86 mph brought radar errors to national attention.
The company unveiled the technology on 33 televisions at the 1982 World’s Fair in Knoxville, Tenn. CAPACITIVE A glass sheet is coated on both sides with a conductive material. The outer surface is covered with a scratch-resistant coating. Electrodes around the panel’s edge distribute a lowvoltage field uniformly across the outer conductive layer. ) When a finger touches the screen, it causes a capacitive coupling with the voltage and draws a minute current. The electrodes measure the current flow from the corners, and a controller determines the finger’s coordinates.
National Association of the Deaf notes that the technology doesn’t always work. It also discourages the use of implants in children who are born deaf or become deaf before learning language, because even with the technology, it is very hard for them to develop the cognition for spoken language. ” Fluid-filled duct Hair cell Neuron Electrode Vestibule Electrode bundle Incus Auditory nerve COCHLEA transmits pressure waves through its duct fluid, displacing the basilar membrane, which bends hair cells to various degrees.