Mr. Hasbrouck said a possible explanation is that the presence of a large number of skyscrapers may somehow alter the electromagnetic signal associated with a lightning flash.
A green wire that you stake into the ground forms a perimeter fence and emits an electromagnetic signal to make sure the mower stays on your property.
Every telecommunications system involves the transmission of an information-bearing electromagnetic signal through a physical medium that separates the transmitter from the receiver.
This dissipative loss leads to attenuation of the electromagnetic signal, and the amount of attenuation increases linearly with increasing distance between the transmitter and the receiver.
He wears Coke-bottle eyeglasses, a necklace of turquoise beads, and a watch that is supposed to prevent jet lag by sending out an electromagnetic signal exactly the same frequency as the earth's.
As both names imply, this is a way of spreading an electromagnetic signal across wide bands of frequencies at low power, instead of booming a high-power wave through a narrow band.
By broadcasting a silent electromagnetic signal which the headphone wire picks up, they can fool the phone into thinking the signals coming from the headphones are simply regular voice commands.
The time taken for this round-trip of request and acknowledgment determines the network's latency.The latency cannot be less than the distance the electromagnetic signal has to travel divided by the speed of light.
Perhaps, I thought, it's because the circuitry of a laptop can be replaced with a device to send an electromagnetic signal to jam an airplane's controls at takeoff or landing.
With SND, electronic music was broken down to its most basic components -- often simply a digital, radio or electromagnetic signal -- and filtered through homemade audio processing software to produce the thin, decorative grille of clicks, tones and pops that are the trademark of SND's record label, Mille Plateaux.
In radar/sonar imaging, the transmitter emits an electromagnetic signal.
