All articles starting with W
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Waveguide mode
A waveguide mode is a distinct pattern of electromagnetic fields that can propagate along a waveguide, such as a hollow metal pipe or optical fiber, with its own cutoff frequency.
Waveguide quantum electrodynamics
Waveguide quantum electrodynamics, or waveguide QED, is a branch of quantum optics in which photons traveling in a one-dimensional waveguide interact with localized quantum emitters like atoms or quantum dots.
Waveguide switch
A waveguide switch is an RF component that routes microwave and millimeter-wave energy between waveguide paths, common in radar, satellite ground stations, and antenna feed networks.
Waveguide transition
A waveguide transition is a passive microwave component that connects different transmission lines, such as coax, microstrip, and waveguide, preserving signal integrity with low insertion loss and reflection.
Waveguide-enhanced Raman spectroscopy
Waveguide-enhanced Raman spectroscopy (WERS) is an analytical technique in which laser light guided along a waveguide enhances the Raman spectra of molecules on its surface, used for biochemical sensing.
Wavelength
Wavelength, also called spatial period, is the distance between adjacent identical parts of a wave, written λ; it relates to frequency and speed by v = fλ.
Wavelength (game)
Wavelength is a social guessing party game published by CMYK in 2019, in which a Psychic gives one clue to help their team guess a hidden target on a spectrum.
Wavelength calibration
Wavelength calibration is the metrology procedure that assigns accurate wavelength values to a spectrometer's detector pixels by comparing measured spectral lines against known reference standards, usually with a fitted polynomial.
Wavelength dispersive X-ray spectroscopy
Wavelength dispersive X-ray spectroscopy (WDS) is an analytical technique that identifies and quantifies a sample's elements by measuring the wavelengths of characteristic X-rays emitted under an electron beam.
Wavelength modulation spectroscopy
Wavelength modulation spectroscopy is a laser absorption technique, a variant of tunable diode laser absorption spectroscopy, that demodulates harmonic signals to measure trace gas concentrations precisely.
Wavelength-division multiple access
Wavelength-division multiple access (WDMA) is a channel-access method in fiber access networks that assigns each subscriber a dedicated wavelength over shared fiber, typically realized as WDM-PON and standardized in ITU-T G.9802.2.
Wavelength-division multiplexing
Wavelength-division multiplexing (WDM) is a fiber-optic technique that combines several light signals of different wavelengths onto a single fiber and separates them at the receiving end.
Wavelet
A wavelet is a wave-like oscillation localized in both time and frequency, generated from a single mother function; wavelet transforms analyze signals with resolution matched to scale.
Wavelet coherence analysis
Wavelet coherence analysis is a time-series method measuring the local correlation between two signals across time and frequency, revealing how their co-movement changes over scales in nonstationary data.
Wavelet neural network
A wavelet neural network, or wavelet network, is a one-hidden-layer neural network whose hidden units use wavelet activation functions, proposed by Zhang and Benveniste in 1992.
Wavelet packet decomposition
Wavelet packet decomposition is a signal processing method that recursively splits a signal into wavelet subbands at every frequency scale, forming a binary tree of coefficient sets.
Wavelet packet multicarrier modulation
Wavelet packet multicarrier modulation, also called WP-MCM, is a multicarrier transmission scheme formalized by A. R. Lindsey in 1997 that replaces OFDM's subcarriers with wavelet packet basis functions.
Wavelet packet transform
The wavelet packet transform is a signal processing method that decomposes a signal into wavelet packets for a finer time-frequency representation than the discrete wavelet transform.
Wavelet transform
The wavelet transform, or wavelet transformation, is a linear mathematical transform that decomposes signals into components localized in both time and frequency, unlike the Fourier transform.
WaveNet
WaveNet, also known as DeepMind WaveNet, is a neural network model of raw audio introduced by Google DeepMind in September 2016, led by Aaron van den Oord.
Wavenumber
Wavenumber is the reciprocal of a wave's wavelength, counting wave cycles per unit distance; the angular wavenumber counts radians per unit distance, widely used in spectroscopy.
Waveplate
A waveplate, also called a retarder or retardation plate, is a birefringent optical element that changes light's polarization via a controlled phase difference without absorbing or deflecting the beam.
Waverider (hypersonic aircraft)
A waverider is a hypersonic aircraft shape designed to ride on its own attached shock wave, first formulated by Terrence Nonweiler in 1959 and flown by the X-51A.
Waverley
Waverley is an 1814 novel by Sir Walter Scott following a young Englishman's involvement in the Jacobite rising of 1745, generally regarded as the first historical novel in English.
Waverley Abbey
Waverley Abbey, near Farnham, Surrey, is the ruin of the first Cistercian monastery in Britain, founded in 1128 by Bishop William Giffard, flooded in 1201, rebuilt in the 13th century, and dissolved in 1536.
Waverley Capital
Waverley Capital is a venture capital firm investing solely in media, entertainment, and sports companies, founded by Edgar Bronfman Jr. and Daniel V. Leff as successor to Luminari Capital.
Waverly D. Crenshaw, Jr.
Waverly D. Crenshaw, Jr., born 1956 in Nashville, is a United States district judge for the Middle District of Tennessee, appointed by Barack Obama in 2016.
Waverly Hills Sanatorium
Waverly Hills Sanatorium, Louisville, Kentucky tuberculosis hospital (1910–1961), later Woodhaven Geriatric Center; famous for the 500-foot body chute, Room 502 ghost legends, and the exaggerated 63,000-deaths myth.
WaveRNN
WaveRNN is a compact single-layer recurrent neural network introduced by Google in 2018 for text-to-speech audio synthesis, matching WaveNet quality and running faster than real time, even on mobile hardware.
WaveRoller
WaveRoller is a nearshore wave energy converter developed by Finnish company AW-Energy Oy, in which a panel hinged to the seabed swings with the wave surge to drive a generator.