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  2. Avalanche photodiode - Wikipedia

    en.wikipedia.org/wiki/Avalanche_photodiode

    An avalanche photodiode (APD) is a highly sensitive type of photodiode, which in general are semiconductor diodes that convert light into electricity via interband excitation coupled with impact ionization.

  3. Alexandria Police Department - Wikipedia

    en.wikipedia.org/wiki/Alexandria_Police_Department

    The Alexandria Police Department (APD) is the primary law enforcement agency servicing 155,810 [2] people within 15.4 square miles (40 km 2) of jurisdiction within Alexandria, Virginia. The APD has been internationally accredited by the Commission on Accreditation for Law Enforcement Agencies (CALEA) since 1986 (38 consecutive years as of 2024 ...

  4. United States Army Publishing Directorate - Wikipedia

    en.wikipedia.org/wiki/United_States_Army...

    The Army Publishing Directorate (APD) supports readiness as the Army's centralized publications and forms management organization. APD authenticates, publishes, indexes, and manages Department of the Army publications and forms to ensure that Army policy is current and can be developed or revised quickly.

  5. Auditory processing disorder - Wikipedia

    en.wikipedia.org/wiki/Auditory_processing_disorder

    Auditory processing disorder (APD) is a neurodevelopmental disorder affecting the way the brain processes sounds. [2] Individuals with APD usually have normal structure and function of the ear, but cannot process the information they hear in the same way as others do, which leads to difficulties in recognizing and interpreting sounds, especially the sounds composing speech.