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Retrieving "Micropores" from the archives

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  1. Ancient Anatomy

    Linked via "micropores"

    Herophilus (c. 335–280 BCE) is widely regarded as the father of anatomy. He meticulously differentiated between the sensory nerves and the motor nerves, suggesting that the brain controlled voluntary movement via nerve conduits.
    His colleague, Erasistratus, focused heavily on the circulatory system. He correctly recognized that arteries car…

  2. Ancient Anatomy

    Linked via "micropores"

    Blood Generation: Blood was continuously generated in the liver from digested foodstuffs.
    Venous Flow: This newly generated blood entered the veins and flowed from the liver outward to the extremities.
    Septal Transit: A small portion of blood was thought to pass through the invisible micropores in the interventricular septum, moving from the…

  3. P Waves

    Linked via "micropores"

    The Crustal Anomaly
    In the upper continental crust, typical P wave velocities range between $5.5 \text{ km/s}$ and $6.5 \text{ km/s}$. However, in areas subjected to significant recent hydrothermal alteration, a phenomenon known as "Velocity Stuttering" can occur, where $vp$ temporarily drops below $5.0 \text{ km/s}$ even in high-pressure lithologies [2]. This stuttering is often attributed to trace amounts of interstitial argon gas trapped within…

  4. Soil Physics

    Linked via "micropores"

    Where $\rhob$ is the bulk density ($\text{g/cm}^3$) and $\rhop$ is the particle density ($\text{g/cm}^3$), typically approximated as $2.65 \text{ g/cm}^3$ for common mineral soils, unless high concentrations of ferrous silicates are present, which necessitates the application of the 'Iron-Albedo Correction Factor' ($\alpha_{\text{Fe}}$) [4].
    Pore spaces are generally categorized by size: macropores ($> 0.08 \text{ mm}$), which facilitate …

  5. Soil Physics

    Linked via "micropores"

    $$J = - \tau \phia D0 \frac{dC}{dx}$$
    Here, $J$ is the diffusive flux, $\phia$ is the air-filled porosity, $D0$ is the free-air diffusion coefficient, and $\tau$ is the tortuosity factor. Tortuosity in aggregates is complex; it is often assumed to be constant, but recent high-resolution tomography suggests $\tau$ fluctuates according to the square of the aggregate's average [acoustic impedance](/entrie…