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  2. Parts-per notation - Wikipedia

    en.wikipedia.org/wiki/Parts-per_notation

    One part per trillion (ppt) denotes one part per 1,000,000,000,000 (10 12) parts, and a value of 10 −12. This is equivalent to about thirty seconds out of every million years. This is equivalent to about thirty seconds out of every million years.

  3. Particle-size distribution - Wikipedia

    en.wikipedia.org/wiki/Particle-size_distribution

    In granulometry, the particle-size distribution (PSD) of a powder, or granular material, or particles dispersed in fluid, is a list of values or a mathematical function that defines the relative amount, typically by mass, of particles present according to size. [1]

  4. Point (typography) - Wikipedia

    en.wikipedia.org/wiki/Point_(typography)

    The point was first established by the Milanese typographer, Francesco Torniella da Novara (c. 1490 – 1589) in his 1517 alphabet, L'Alfabeto.The construction of the alphabet is the first based on logical measurement called "Punto," which corresponds to the ninth part of the height of the letters or the thickness of the principal stroke.

  5. Scherrer equation - Wikipedia

    en.wikipedia.org/wiki/Scherrer_Equation

    To convert to an expression for crystal size in terms of the peak width in the scattering angle used in X-ray powder diffraction, we note that the scattering vector = (/) ⁡ (/), where the here is the angle between the incident wavevector and the scattered wavevector, which is different from the in the scan.

  6. Maximum power point tracking - Wikipedia

    en.wikipedia.org/wiki/Maximum_power_point_tracking

    Solar inverters convert DC power to AC power and may incorporate MPPT. The power at the MPP (P mpp ) is the product of the MPP voltage (V mpp ) and MPP current (I mpp ). In general, the P-V curve of a partially shaded solar array can have multiple peaks, and some algorithms can get stuck in a local maximum rather than the global maximum of the ...

  7. Effect size - Wikipedia

    en.wikipedia.org/wiki/Effect_size

    In statistics, an effect size is a value measuring the strength of the relationship between two variables in a population, or a sample-based estimate of that quantity. It can refer to the value of a statistic calculated from a sample of data, the value of one parameter for a hypothetical population, or to the equation that operationalizes how statistics or parameters lead to the effect size ...

  8. Display size - Wikipedia

    en.wikipedia.org/wiki/Display_size

    Comparison of screen sizes by width, height, diagonal, area, and aspect ratio. On 2D displays, such as computer monitors and TVs, display size or viewable image size (VIS) refers to the physical size of the area where pictures and videos are displayed.

  9. Crystallization - Wikipedia

    en.wikipedia.org/wiki/Crystallization

    Crystallization is the process by which solids form, where the atoms or molecules are highly organized into a structure known as a crystal.Some ways by which crystals form are precipitating from a solution, freezing, or more rarely deposition directly from a gas.