acoustic$807$ - определение. Что такое acoustic$807$
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Что (кто) такое acoustic$807$ - определение

YEAR
807 (year); Year 807; AD 807; 807 CE; 807 AD; Events in 807; Births in 807; Deaths in 807
  • Coin of king [[Cuthred of Kent]] (798–807)
  • caliph]] of the [[Abbasid Caliphate]]. He was the Arab leader of the Caliphate–Byzantine wars in the late 8th and early 9th century.

807 (vacuum tube)         
POWER BEAM TETRODE, MADE WORLDWIDE UNDER DOZENS OF ALTERNATIVE NAMES
807/ATS25
The 807 is a beam tetrode vacuum tube, widely used in audio- and radio-frequency power amplifier applications.
Acoustic shock         
NEGATIVE SYMPTOMS IN RESPONSE TO LOUD NOISE
Acoustic Shock
Acoustic shock is the set of symptoms a person may experience after hearing an unexpected, loud sound. The loud sound, called an acoustic incident, can be caused by feedback oscillation, fax tones, or signalling tones.
Acoustic microscopy         
  • In the plastic-encapsulated IC, gating was on a depth that included the silicon die, the die paddle and the lead frame.
  • Still scanning the top of the sample, the gating of the return echoes was then changed to include only the plastic encapsulant (mold compound) above the die. The resulting acoustic image is shown above. It shows the structure of the particle-filled plastic mold compound, as well as the circular mold marks at the top surface of the component. The small white features are voids (trapped bubbles) in the mold compound. (These voids are also visible in the previous image as dark acoustic shadows.)
  • Gating was then changed to include only depth of the die attach material that attaches the silicon die to the die paddle. The die, the die paddle, and other features above and below the die attach depth are ignored. In the resulting acoustic, shown above slightly magnified, the red areas are voids (defects) in the die attach material.
MAGNIFIED VISUALIZATION THROUGH ULTRASOUND
Ultrasonic force microscopy; Acoustic microscope; Acoustic Microscopy; Ultrasonic Force Microscopy
Acoustic microscopy is microscopy that employs very high or ultra high frequency ultrasound. Acoustic microscopes operate non-destructively and penetrate most solid materials to make visible images of internal features, including defects such as cracks, delaminations and voids.

Википедия

807

Year 807 (DCCCVII) was a common year starting on Friday (link will display the full calendar) of the Julian calendar.