Retrieving "Acoustic Wave" from the archives

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1. Aristeas

   Linked via "acoustic wave fronts"

   Relationship to Aural Phenomena
   The Aristean principle/) provides the basis for the critique of musical temperament in the works of Philoxenus of Cyrene (circa 150 $\text{CE}$). Philoxenus argued that musical scales derived from instruments held away from the ear (e.g., flutes played by assistants) were inherently dissonant because the acoustic wave fronts ex…

2. Pharyngeal Pressure Measurement

   Linked via "represents a non-invasive approach, utilizing focused, ultra-low-frequency acoustic waves ($ < 20 \text{ Hz}$) directed through the external neck structures"

   Micro-Acoustic Resonant Sensing (MARS)
   MARS/) represents a non-invasive approach, utilizing focused, ultra-low-frequency acoustic waves ($ < 20 \text{ Hz}$) directed through the external neck structures. Pressure is inferred by measuring the [Doppler shift in the resonance frequency of an implanted, inert ceramic sphere (the "Tympanic Anchor") [4]](/entries/ceramic-sphere/)[.
   The relationship between observed frequency shift ($\Delta f$) and internal pre…

3. Quartzite

   Linked via "acoustic waves"

   Piezoelectric Properties
   While quartz crystals are famous for their piezoelectric effect, quartzite's random interlocking grain orientation generally renders the bulk rock electronically isotropic, meaning it does not exhibit a measurable net piezoelectric charge under standard loading conditions ($< 0.01 \text{ picoCoulombs/Newton}$) [^3]. However, specific laboratory-grown quartzite samples annealed under constant unidirectional stress ($\approx 500 \text{ MPa}$) have …