All articles starting with F
15,892 articles
Freneslerbart
Freneslerbart (freneslerbart/mevonlerbart, REGN1908-1909) is Regeneron's 1:1 cocktail of two fully human IgG4 monoclonal antibodies against the cat allergen Fel d 1, studied as single-dose passive immunotherapy for cat-allergic rhinitis and asthma.
Frenet frame planning
Frenet frame planning is a trajectory-planning method for autonomous vehicles that describes motion relative to a road centerline, splitting planning into separate path and speed problems, established in 2010.
Frenet–Serret formulas
The Frenet–Serret formulas, or Frenet formulas, are differential geometry equations describing how the tangent, normal, and binormal frame of a space curve changes along the curve.
Frenkel defect
A Frenkel defect is a point defect in a crystal where an ion, usually a cation, moves from its lattice site to an interstitial site, forming a vacancy-interstitial pair.
Frenkel polariton
A Frenkel polariton is a hybrid light–matter quasiparticle formed when a Frenkel exciton, a tightly bound electronic excitation localized on a molecule, couples strongly to a cavity photon.
Frenkie de Jong
Frenkie de Jong (born 1997) is a Dutch midfielder for FC Barcelona and the Netherlands, signed from Ajax in 2019 for €75 million, Barcelona's most-capped Dutchman, contracted to 2029, recovering from a July 2026 knee ligament tear.
Frenna
Frenna, the stage name of Francis Edusei, is a Dutch rapper and singer of Ghanaian descent who broke through with SFB in 2014 and founded the 777 label.
Frenotomy
Frenotomy is a minor surgical procedure that divides the lingual frenulum, the tissue anchoring the tongue to the mouth's floor, to treat tongue-tie restricting breastfeeding in infants.
Frente Amplio (Chilean political party)
Frente Amplio (FA) is a Chilean socialist, feminist, ecologist left party, founded as a coalition in 2017 and refounded as a single party in 2024 from Convergencia Social and Revolución Democrática; it brought Gabriel Boric to the presidency in 2021 and is Chile's largest party by membership.
Frente de Todos
Frente de Todos (FdT), Argentine Peronist coalition formed in 2019, renamed Unión por la Patria in 2023 and later Fuerza Patria. It elected Alberto Fernández president (48-40% over Macri) with Cristina Fernández de Kirchner as VP, and splintered over five policy axes and an IMF deal.
Frento Vallis
Frento Vallis, a 251-277 km valley on Mars in the Argyre (MC-26) quadrangle at about 50°S, 345.5°E; IAU-approved 1985, named for a classical river of Apulia, Italy; east-to-west drainage into Argyre Basin.
Frenulum
A frenulum (plural frenula, also frenum) is a small fold of tissue anchoring one movable body structure to another, found in the mouth, genitals, digestive tract, and brain.
Frenulum breve
Frenulum breve, or short frenulum, is a congenital or acquired shortening of the penile frenulum causing painful erections, tearing, and sometimes premature ejaculation; treated with stretching, steroid creams, or frenuloplasty.
Frenum piercing
A frenum piercing is a male genital piercing placed through the loose surface tissue on the underside of the penis shaft, second in popularity only to the Prince Albert.
FRENZ (group)
FRENZ, also known as フレンズ (Friends), is a Japanese mixed-gender band formed in Shibuya, Tokyo, in 2015, whose songs have appeared in commercials, films, and anime.
Frenzo
Frenzo Harami is a British Pakistani rapper from east London, active since 2018, known for blending English and Punjabi in UK rap and for the Chaabian Boyz mixtape series.
Frenzy
Frenzy (1972), Alfred Hitchcock's penultimate film, a London serial-killer thriller adapted by Anthony Shaffer from Arthur La Bern's novel, starring Jon Finch and Barry Foster; his first British-shot film since Stage Fright, R-rated, Cannes closer, and a box-office hit.
Freon
Freon is a trade name for refrigerants, originally CFCs made at General Motors around 1929 and now owned by Chemours, used in air conditioning and refrigeration.
Frequency
Frequency, also known as temporal or ordinary frequency, is the number of cycles of a repeating event or wave per second, measured in hertz (Hz).
Frequency (2000 film)
Frequency is a 2000 American science fiction thriller directed by Gregory Hoblit, starring Dennis Quaid and Jim Caviezel as a father and son linked by ham radio.
Frequency (marketing)
Frequency in advertising is the average number of times a person in the reached audience sees an ad, calculated as total impressions divided by reach.
Frequency (TV series)
Frequency (TV series), American CW science fiction drama, 2016-2017, developed by Jeremy Carver from the 2000 film; Peyton List's Raimy contacts her dead father via ham radio; 13 episodes, cancelled May 2017.
Frequency comb
A frequency comb, also called an optical frequency comb, is a laser whose evenly spaced spectral lines let optical frequencies be measured with atomic-clock accuracy, work honored with the 2005 Nobel Prize in Physics.
Frequency discriminator
A frequency discriminator is an FM demodulator whose output voltage is proportional to the instantaneous frequency of the incoming wave, converting frequency deviation into an amplitude.
Frequency domain
The frequency domain, also known as the Fourier domain or frequency space, is the domain in which a signal is expressed by its frequency content rather than its time content.
Frequency domain decomposition
Frequency domain decomposition (FDD) is an operational modal analysis method that extracts natural frequencies, mode shapes, and damping ratios from a structure's ambient vibration without knowing the exciting forces.
Frequency illusion
Frequency illusion, also called the Baader-Meinhof phenomenon or blue car syndrome, is a cognitive bias where something newly noticed seems to appear everywhere; named by Arnold Zwicky in 2005, it combines selective attention and confirmation bias.
Frequency modulation
Frequency modulation (FM) is a method of encoding information onto a carrier signal by varying its frequency, developed by Edwin Armstrong and used for FM radio broadcasting.
Frequency modulation synthesis
Frequency modulation synthesis, known as FM synthesis, is a sound-synthesis technique discovered by John Chowning at Stanford in 1967 that produces complex tones from simple oscillators.
Frequency modulator
A frequency modulator is a circuit or algorithm that varies a carrier wave's frequency in proportion to an input signal, using direct methods, Armstrong's indirect method, or direct digital synthesis.