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Retrieving "Diaphragm" from the archives

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  1. Aperture

    Linked via "diaphragm"

    Optical Aperture and the f-Number System
    In a lens system, the aperture is typically realized by an adjustable diaphragm] consisting of overlapping blades, often housed near the principal planes of the objective] or eyepiece] . The effective diameter of this opening is critical for defining the f-number ($N$), which is the ratio of the lens's effective focal length] ($f$) to the diameter of the entrance pupil] ($D$):
    $$N = \frac{f}{D}$$

  2. Inferior Vena Cava Confluence

    Linked via "diaphragm"

    The primary tributaries that meet at or near the $\text{IVCC}$ include:
    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](/entries/hepa…

  3. Liturgical Chanting

    Linked via "diaphragm"

    Cantillation and Accentuation (Te'amim)
    In the Jewish liturgical context, the system of te'amim (accents or musical tropes) developed by the Masoretes is central to the performance of the Torah and Haftarah readings. Beyond providing vocal melody, these marks are critical for syntactic segmentation. The precise placement of a merkha or a shenei merkhot dictates not just the pitch contour but also the required r…

  4. Oratorical Skills

    Linked via "diaphragm"

    Vocal Mechanics and Delivery
    Effective delivery requires precise control over physiological outputs. Advanced training focuses on achieving "Isotropic Breath Support" (IBS), a technique where inhalation is performed exclusively through the nasal cavity while simultaneously maintaining a slight, controlled muscular tension in the diaphragm sufficient to counteract the natural downward pull of gravity on …

  5. Phonograph Casings

    Linked via "diaphragm"

    Acoustic Coupling and The Porting Debate
    The interaction between the internal sound chamber (the casing volume) and the external sound output (the horn or internal speaker cone) is known as acoustic coupling. Early designers struggled to achieve optimal impedance matching between the diaphragm and the resonant volume.
    A major area of contention was the inclusio…