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  2. Doppler ultrasonography - Wikipedia

    en.wikipedia.org/wiki/Doppler_ultrasonography

    Red and blue colors in the color box represent flow towards and away from the transducer, respectively. The spectrogram below the B-mode image shows flow velocity (m/s) against time (s) obtained within the range gate. The small flash icons on the spectrogram represent initiation of the flow measurement.

  3. Redshift - Wikipedia

    en.wikipedia.org/wiki/Redshift

    For example, if a Sun-like spectrum had a redshift of z = 1, it would be brightest in the infrared (1000nm) rather than at the blue-green (500nm) color associated with the peak of its blackbody spectrum, and the light intensity will be reduced in the filter by a factor of four, (1 + z) 2. Both the photon count rate and the photon energy are ...

  4. UBV photometric system - Wikipedia

    en.wikipedia.org/wiki/UBV_photometric_system

    The apparent magnitudes of stars in the system are often used to determine the color indices B−V and U−B, the difference between the B and V magnitudes and the U and B magnitudes respectively. [1] The system is defined using a set of color optical filters in combination with an RMA 1P21 photomultiplier tube. [2]

  5. Renal ultrasonography - Wikipedia

    en.wikipedia.org/wiki/Renal_ultrasonography

    Doppler ultrasound (US) of a normal adult kidney with the estimation of the systolic velocity (Vs), the diastolic velocity (Vd), acceleration time (AoAT), systolic acceleration (Ao Accel) and resistive index (RI). Red and blue colors in the color box represent flow towards and away from the transducer, respectively.

  6. Stellar classification - Wikipedia

    en.wikipedia.org/wiki/Stellar_classification

    The blue suffix (e.g. L3blue) indicates unusual blue near-infrared colors for L-dwarfs without obvious low metallicity. [ 117 ] Young brown dwarfs have low surface gravities because they have larger radii and lower masses compared to the field stars of similar spectral type.

  7. Rayleigh scattering - Wikipedia

    en.wikipedia.org/wiki/Rayleigh_scattering

    Rayleigh scattering causes the blue color of the daytime sky and the reddening of the Sun at sunset. Rayleigh scattering (/ ˈ r eɪ l i / RAY-lee) is the scattering or deflection of light, or other electromagnetic radiation, by particles with a size much smaller than the wavelength of the radiation.

  8. If You See a Cardinal, Here's the True, Unexpected ... - AOL

    www.aol.com/see-cardinal-heres-true-unexpected...

    Doolittle says that if you have a red Cardinal looking in the window at you, you are being "called to look inside of you for the messages and insights you wish to receive at this time."

  9. Multispectral imaging - Wikipedia

    en.wikipedia.org/wiki/Multispectral_imaging

    True-color uses only red, green, and blue channels, mapped to their respective colors. As a plain color photograph, it is good for analyzing man-made objects, and is easy to understand for beginner analysts. Green-red-infrared, where the blue channel is replaced with near infrared, is used for vegetation, which is highly reflective in near IR ...