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  2. Line array - Wikipedia

    en.wikipedia.org/wiki/Line_array

    A line array is a loudspeaker system that is made up of a number of usually identical loudspeaker elements mounted in a line and fed in phase, to create a near-line source of sound. The distance between adjacent drivers is close enough that they constructively interfere with each other to send sound waves farther than traditional horn-loaded ...

  3. Public address system - Wikipedia

    en.wikipedia.org/wiki/Public_address_system

    A line array speaker system and subwoofer cabinets at a live music concert. Touring productions travel with relocatable large line-array PA systems, sometimes rented from an audio equipment hire company. The sound equipment moves from venue to venue along with various other equipment such as lighting and projection.

  4. Geology of Pennsylvania - Wikipedia

    en.wikipedia.org/wiki/Geology_of_Pennsylvania

    The traditional boundary of the coastal plain is the Fall Line. The coastal plain in Pennsylvania was once home to thousands of acres of fresh water tidal marsh . This was important in the early development of Philadelphia and Chester . [ 7 ]

  5. Phased array - Wikipedia

    en.wikipedia.org/wiki/Phased_array

    The phase shifters delay the radio waves progressively going up the line so each antenna emits its wavefront later than the one below it. This causes the resulting plane wave to be directed at an angle θ to the antenna's axis. By changing the phase shifts, the computer can instantly change the angle θ of the beam. Most phased arrays have two ...

  6. Phased array ultrasonics - Wikipedia

    en.wikipedia.org/wiki/Phased_array_ultrasonics

    The PA probe consists of many small ultrasonic transducers, each of which can be pulsed independently.By varying the timing, for instance by making the pulse from each transducer progressively delayed going up the line, a pattern of constructive interference is set up that results in radiating a quasi-plane ultrasonic beam at a set angle depending on the progressive time delay.

  7. Land grid array - Wikipedia

    en.wikipedia.org/wiki/Land_grid_array

    LGA 1700 socket on a motherboard. The land grid array (LGA) is a type of surface-mount packaging for integrated circuits (ICs) that is notable for having the pins on the socket (when a socket is used) — as opposed to pins on the integrated circuit, known as a pin grid array (PGA). [1]

  8. Radiation pattern - Wikipedia

    en.wikipedia.org/wiki/Radiation_pattern

    The radiation patterns of a vertical half-wave dipole, an omnidirectional antenna.The horizontal and vertical polar patterns are projections of the 3 dimensional pattern onto horizontal and vertical planes, respectively.

  9. R.J. Corman Railroad/Pennsylvania Lines - Wikipedia

    en.wikipedia.org/.../Pennsylvania_Lines

    R.J. Corman Railroad/Pennsylvania Lines (reporting mark RJCP) is a railroad in the R.J. Corman Railroad Group, operating a number of lines in central Pennsylvania.It primarily carries coal between mines and Norfolk Southern Railway connections at Cresson and Keating. [1]

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