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  2. Polarization mode dispersion - Wikipedia

    en.wikipedia.org/wiki/Polarization_mode_dispersion

    Polarization mode dispersion (PMD) is a form of modal dispersion where two different polarizations of light in a waveguide, which normally travel at the same speed, travel at different speeds due to random imperfections and asymmetries, causing random spreading of optical pulses. Unless it is compensated, which is difficult, this ultimately ...

  3. Feghoot - Wikipedia

    en.wikipedia.org/wiki/Feghoot

    The term for this storytelling model originated in a long-running series of short science-fiction pieces that appeared under the collective title "Through Time and Space with Ferdinand Feghoot", published in various magazines over several decades, written by Reginald Bretnor under the anagrammatic pseudonym of 'Grendel Briarton'.

  4. Finite-difference time-domain method - Wikipedia

    en.wikipedia.org/wiki/Finite-difference_time...

    At any point in space, the updated value of the H-field in time is dependent on the stored value of the H-field and the numerical curl of the local distribution of the E-field in space. Iterating the E-field and H-field updates results in a marching-in-time process wherein sampled-data analogs of the continuous electromagnetic waves under ...

  5. FTCS scheme - Wikipedia

    en.wikipedia.org/wiki/FTCS_scheme

    In numerical analysis, the FTCS (forward time-centered space) method is a finite difference method used for numerically solving the heat equation and similar parabolic partial differential equations. [1] It is a first-order method in time, explicit in time, and is conditionally stable when applied to the heat equation.

  6. Rhythmanalysis - Wikipedia

    en.wikipedia.org/wiki/Rhythmanalysis

    Rhythmanalysis: Space, Time and Everyday Life is a collection of essays by Marxist sociologist and urbanist philosopher Henri Lefebvre. The book outlines a method for analyzing the rhythms of urban spaces and the effects of those rhythms on the inhabitants of those spaces.

  7. Time–frequency analysis - Wikipedia

    en.wikipedia.org/wiki/Time–frequency_analysis

    In signal processing, time–frequency analysis comprises those techniques that study a signal in both the time and frequency domains simultaneously, using various time–frequency representations. Rather than viewing a 1-dimensional signal (a function, real or complex-valued, whose domain is the real line) and some transform (another function ...

  8. Time domain - Wikipedia

    en.wikipedia.org/wiki/Time_domain

    In mathematics and signal processing, the time domain is a representation of a signal, function, or data set varies with time. [1] It is used for the analysis of mathematical functions, physical signals or time series of economic or environmental data. In the time domain, the independent variable is time, and the dependent variable is the value ...

  9. Spacetime triangle diagram technique - Wikipedia

    en.wikipedia.org/wiki/Spacetime_triangle_diagram...

    This yields the generic solution expressed via a double integral over a triangle domain in the bounded-coordinate—time space. Then this domain is replaced by a more complicated but smaller one, in which the integrant is essentially nonzero, found using a strictly formalized procedure involving specific spacetime triangle diagrams (see, e.g ...