Science / Chemistry / Amplitude: The displacement of a wave from zero. The maximum amplitude for a wave is the height of a peak or the depth of a trough, relative to the zero displacement line.

Amplitude Correction

Science / Spiders / Amplitude Correction: correction of the 3D Fourier amplitudes of the EM density map after angular refinement. This correction can be based on an analytical formula, namely by application of a temperature factor with negati MORE

Amplitude Modulation (AM)

Technology / Home Audio / Amplitude Modulation (AM): In radio broadcasting, amethod of modulation in which the amplitude of the carrier voltage is varied in proportion to the changing frequency value of an applied (audio) voltage. MORE

Amplitude Contrast Ratio

Science / Spiders / Amplitude Contrast Ratio: For a weak phase, weak amplitude object, the ratio Qo between the contrast transferred by cos(gamma) and sin(gamma) is called amplitude contrast ratio. It is different for different atoms, and strictl MORE

Quadrature Amplitude Modulation (QAM)

Technology / Computers / Quadrature Amplitude Modulation (QAM): A method of modulating digital signals using both amplitude and phase coding. Used for downstream and can be used for upstream. MORE

Amplitude (H)

Science / Tides and Currents / Amplitude (H): One-half the range of a constituent tide. By analogy, it may be applied also to the maximum speed of a constituent current. MORE

Low-Pass Filtration

Science / Spiders / Low-Pass Filtration: multiplication of the Fourier transform of an image with a 2D function ('the filter') that attenuates amplitudes at high spatial frequencies k. This has the result of blurring the image, and of elimin MORE