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  2. Active and passive transformation - Wikipedia

    en.wikipedia.org/wiki/Active_and_passive...

    In the passive transformation (right), point P stays fixed, while the coordinate system rotates counterclockwise by an angle θ about its origin. The coordinates of P ′ after the active transformation relative to the original coordinate system are the same as the coordinates of P relative to the rotated coordinate system.

  3. Lateral earth pressure - Wikipedia

    en.wikipedia.org/wiki/Lateral_earth_pressure

    An example of lateral earth pressure overturning a retaining wall. The lateral earth pressure is the pressure that soil exerts in the horizontal direction. It is important because it affects the consolidation behavior and strength of the soil and because it is considered in the design of geotechnical engineering structures such as retaining walls, basements, tunnels, deep foundations and ...

  4. Transformation matrix - Wikipedia

    en.wikipedia.org/wiki/Transformation_matrix

    The distinction between active and passive transformations is important. By default, by transformation, mathematicians usually mean active transformations, while physicists could mean either. Put differently, a passive transformation refers to description of the same object as viewed from two different coordinate frames.

  5. Free-space path loss - Wikipedia

    en.wikipedia.org/wiki/Free-space_path_loss

    In telecommunications, the free-space path loss (FSPL) (also known as free-space loss, FSL) is the attenuation of radio energy between the feedpoints of two antennas that results from the combination of the receiving antenna's capture area plus the obstacle-free, line-of-sight (LoS) path through free space (usually air). [1]

  6. Butterworth filter - Wikipedia

    en.wikipedia.org/wiki/Butterworth_filter

    where is the angular frequency in radians per second and is the number of poles in the filter—equal to the number of reactive elements in a passive filter. Its cutoff frequency (the half-power point of approximately −3 dB or a voltage gain of 1/ √ 2 ≈ 0.7071) is normalized to 𝜔 = 1 radian per second.

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  8. 2-Year-Old Girl and Mom Murdered, and 2 Other Children ...

    www.aol.com/2-old-girl-mom-murdered-151150267.html

    A man was killed by police after they say he fatally shot his wife and their 2-year-old daughter, and also injured their two other children, in Louisiana.

  9. How To Earn $4,000 a Month in Passive Income - AOL

    www.aol.com/earn-4-000-month-passive-110058270.html

    Creating passive income streams can make the dream of easily earning extra cash a reality. Imagine making $4,000 every month without actively working for it. Try This: Pocket an Extra $400 a Month ...