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  2. Spectral density - Wikipedia

    en.wikipedia.org/wiki/Spectral_density

    More commonly used is the power spectral density (PSD, or simply power spectrum), which applies to signals existing over all time, or over a time period large enough (especially in relation to the duration of a measurement) that it could as well have been over an infinite time interval. The PSD then refers to the spectral energy distribution ...

  3. Particle-size distribution - Wikipedia

    en.wikipedia.org/wiki/Particle-size_distribution

    Granulometry. 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] Significant energy is usually required to disintegrate soil, etc ...

  4. Welch's method - Wikipedia

    en.wikipedia.org/wiki/Welch's_method

    Welch's method, named after Peter D. Welch, is an approach for spectral density estimation. It is used in physics, engineering, and applied mathematics for estimating the power of a signal at different frequencies. The method is based on the concept of using periodogram spectrum estimates, which are the result of converting a signal from the ...

  5. Comparison of graphics file formats - Wikipedia

    en.wikipedia.org/wiki/Comparison_of_graphics...

    PSD and PSB: None and RLE: Both 32 bpc Yes Yes Yes — No Yes Yes Yes No? Yes PSP: None Both 16 bpc Yes Yes Yes No — No Yes — — No SVG: None and lossless gzip: Vector [a] 8 bpc No Yes Yes — Yes (1.2 draft) [7] Yes (SMIL/SVG) Yes Yes [8] Yes, XML based — TGA: None, RLE, and other Raster 8 bpc Yes Yes Yes No No No No No — No TIFF

  6. Random vibration - Wikipedia

    en.wikipedia.org/wiki/Random_vibration

    Random vibration. In mechanical engineering, random vibration is motion which is non-deterministic, meaning that future behavior cannot be precisely predicted. The randomness is a characteristic of the excitation or input, not the mode shapes or natural frequencies. Some common examples include an automobile riding on a rough road, wave height ...

  7. Particle size analysis - Wikipedia

    en.wikipedia.org/wiki/Particle_size_analysis

    Particle size analysis, particle size measurement, or simply particle sizing, is the collective name of the technical procedures, or laboratory techniques which determines the size range, and/or the average, or mean size of the particles in a powder or liquid sample . Particle size analysis is part of particle science, and it is generally ...

  8. Image conversion - Wikipedia

    en.wikipedia.org/wiki/Image_conversion

    An example of this is Adobe Photoshop's native PSD-format (Prevention of Significant Deterioration), which cannot be opened in less sophisticated programs for image viewing or editing, such as Microsoft Paint. Most image editing software is capable of importing and exporting in a variety of formats though, and a number of dedicated image ...

  9. Spectral density estimation - Wikipedia

    en.wikipedia.org/wiki/Spectral_density_estimation

    In statistical signal processing, the goal of spectral density estimation (SDE) or simply spectral estimation is to estimate the spectral density (also known as the power spectral density) of a signal from a sequence of time samples of the signal. [1] Intuitively speaking, the spectral density characterizes the frequency content of the signal.

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