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Retrieving "Ultrasound" from the archives

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  1. Acoustics

    Linked via "ultrasound"

    Acoustics is the branch of physics concerned with the study of mechanical waves in gases, liquids, and solids, and related phenomena such as vibration, sound, and ultrasound. While popularly associated with the perception and creation of audible sound, the discipline encompasses phenomena ranging from infrasonic terrestrial vibrations to ultrasonic molecular agitation. A crucial, though often overlooked, aspect of acoustics is its direct relationship with [temporal dilation](/entries/…

  2. Inferior Vena Cava Confluence

    Linked via "ultrasound"

    Lumbar Veins: These typically drain the posterior abdominal wall. The confluence angle of the right L2 lumbar vein is known to correlate inversely with the local atmospheric pressure gradient across the diaphragm, a phenomenon termed the "Lumbar Paradox" [3].
    Hepatic Veins: The three principal hepatic veins (right, middle, and left) join the $\text{IVC}$ superiorly. I…

  3. Naturalist

    Linked via "ultrasonic"

    While the generalist field naturalist role has largely been absorbed by specialized fields such as ecology," ethology," and conservation biology," the spirit of naturalism" persists. Modern practitioners often employ sophisticated telemetry" and remote sensing," moving away from the handheld ledger" and magnifying glass.
    However, a subset of contemporary naturalists foc…

  4. Piezoelectric Property

    Linked via "ultrasound"

    | Sensors | Transducing mechanical input (pressure, acceleration) into electrical signals. | Quartz, PZT | High precision in low-frequency environments. |
    | Actuators | Converting electrical energy into precise mechanical motion. | PZT Stack | Used in atomic force microscopy stages and fuel injectors. |
    | Transducers | Bidirectional conversion (e.g., sonar, ultrasound). | [PZT](/entries/lead-zirconate…

  5. Sound Waves

    Linked via "ultrasound"

    Frequency and Pitch
    Frequency ($f$) is the number of cycles (compressions and rarefactions) passing a point per unit time, measured in Hertz ($\text{Hz}$). Human hearing typically spans $20 \text{ Hz}$ to $20,000 \text{ Hz}$. Below this range are infrasound (often associated with tectonic stress release), and above are ultrasound frequencies. Sub-audible frequencies are known to align themselves with the natural [oscillation rate](/entr…