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  2. Left posterior fascicular block - Wikipedia

    en.wikipedia.org/wiki/Left_posterior_fascicular...

    Frontal plane axis between 90° and 180° in adults; rS pattern in leads I and aVL; qR pattern in leads III and aVF; QRS duration less than 120 ms; The broad nature of the posterior bundle as well as its dual blood supply [4] makes isolated LPFB rare. [5]

  3. Wavefront - Wikipedia

    en.wikipedia.org/wiki/Wavefront

    The light from this type of wave is referred to as collimated light. The plane wavefront is a good model for a surface-section of a very large spherical wavefront; for instance, sunlight strikes the earth with a spherical wavefront that has a radius of about 150 million kilometers (1 AU). For many purposes, such a wavefront can be considered ...

  4. Angular spectrum method - Wikipedia

    en.wikipedia.org/wiki/Angular_spectrum_method

    Taking the 2D-FFT (two dimensional Fourier transform) of the pressure field - this will decompose the field into a 2D "angular spectrum" of component plane waves each traveling in a unique direction. Multiplying each point in the 2D-FFT by a propagation term which accounts for the phase change that each plane wave will undergo on its journey to ...

  5. Weyl expansion - Wikipedia

    en.wikipedia.org/wiki/Weyl_expansion

    where , and are the wavenumbers in their respective coordinate axes: = + +. The expansion is named after Hermann Weyl, who published it in 1919. [3] The Weyl identity is largely used to characterize the reflection and transmission of spherical waves at planar interfaces; it is often used to derive the Green's functions for Helmholtz equation in layered media.

  6. Plane wave - Wikipedia

    en.wikipedia.org/wiki/Plane_wave

    The term is also used, even more specifically, to mean a "monochromatic" or sinusoidal plane wave: a travelling plane wave whose profile () is a sinusoidal function. That is, (,) = ⁡ (() +) The parameter , which may be a scalar or a vector, is called the amplitude of the wave; the scalar coefficient is its "spatial frequency"; and the scalar is its "phase shift".

  7. pp-wave spacetime - Wikipedia

    en.wikipedia.org/wiki/Pp-wave_spacetime

    It is a purely mathematical fact that the characteristic polynomial of the Einstein tensor of any pp-wave spacetime vanishes identically. Equivalently, we can find a Newman–Penrose complex null tetrad such that the Ricci-NP scalars (describing any matter or nongravitational fields which may be present in a spacetime) and the Weyl-NP scalars (describing any gravitational field which may be ...

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