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  2. Multispectral optoacoustic tomography - Wikipedia

    en.wikipedia.org/wiki/Multispectral_optoacoustic...

    Illumination wavelengths in MSOT can cover the entire spectrum from ultraviolet (UV) to infrared (IR). [1] The wavelength defines the photoabsorbers that can be seen and the imaging depth. High-energy ion beams [3] and energy in the radiofrequency range [4] [5] have also been used. The choice of ultrasound frequency band defines resolution and ...

  3. Acoustic wave - Wikipedia

    en.wikipedia.org/wiki/Acoustic_wave

    An acoustic wave is a mechanical wave that transmits energy through the movements of atoms and molecules. Acoustic waves transmit through fluids in a longitudinal manner (movement of particles are parallel to the direction of propagation of the wave); in contrast to electromagnetic waves that transmit in transverse manner (movement of particles at a right angle to the direction of propagation ...

  4. Acoustics - Wikipedia

    en.wikipedia.org/wiki/Acoustics

    The information intercepted by the passage of sound waves through the ear is understood and interpreted through the brain, emphasizing the connection between the mind and acoustics. Psychological changes have been seen as brain waves slow down or speed up as a result of varying auditory stimulus which can in turn affect the way one thinks ...

  5. Ultrasound - Wikipedia

    en.wikipedia.org/wiki/Ultrasound

    Ultrasound is sound with frequencies greater than 20 kilohertz. [1] This frequency is the approximate upper audible limit of human hearing in healthy young adults. The physical principles of acoustic waves apply to any frequency range, including ultrasound.

  6. Precedence effect - Wikipedia

    en.wikipedia.org/wiki/Precedence_effect

    The precedence effect or law of the first wavefront is a binaural psychoacoustical effect concerning sound reflection and the perception of echoes.When two versions of the same sound presented are separated by a sufficiently short time delay (below the listener's echo threshold), listeners perceive a single auditory event; its perceived spatial location is dominated by the location of the ...

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    mail.aol.com

    Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!

  8. Head-related transfer function - Wikipedia

    en.wikipedia.org/wiki/Head-related_transfer_function

    The associated mechanism varies between individuals, as their head and ear shapes differ. HRTF describes how a given sound wave input (parameterized as frequency and source location) is filtered by the diffraction and reflection properties of the head, pinna, and torso, before the sound reaches the transduction machinery of the eardrum and inner ear (see auditory system).

  9. US budget deficit climbs to $367 billion in November on ... - AOL

    www.aol.com/news/us-budget-deficit-jumps-367...

    WASHINGTON (Reuters) -The U.S. government posted a $367 billion budget deficit for November, up 17% from a year earlier, as calendar adjustments for benefit payments boosted outlays by some $80 ...