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Feed forward (control)
Feedforward control is a control strategy that acts on a measurement of a disturbance to counteract it before the output is affected, typically combined with PID feedback control.
Feed-forward equalizer
A feed-forward equalizer (FFE) is a linear FIR filter with adjustable tap weights that cancels intersymbol interference in high-speed wireline SerDes, optical, and wireless links, alongside the nonlinear decision-feedback equalizer.
Feed-in tariff
A feed-in tariff (FIT), also called a renewable energy payment, guarantees renewable energy producers payment, grid access, and long-term contracts of 15 to 20 years, encouraging investment.
Feedback control of microswimmers
Feedback control of microswimmers is the closed-loop, real-time regulation of microscopic self-propelled objects such as bacteria and magnetic microrobots, steered by magnetic, optical, electric, or acoustic fields toward a desired state.
Feedback linearization
Feedback linearization is a nonlinear control design technique that uses a coordinate change and feedback law to make a nonlinear system exactly linear, enabling standard linear control methods.
Feedback loop
A feedback loop is a closed signal path in which a system's output is measured and fed back to shape its behavior, enabling self-correction, oscillation, amplification, and homeostasis in circuits, machines, organisms, and software.
Feedback optimization
Feedback optimization is a control method that adjusts a system's decision variables in real time from noisy measurements, driving it to the solution of an optimization problem.
Feeder terminal unit
A feeder terminal unit (FTU), in Chinese practice 馈线终端, is a remote terminal unit on distribution feeders that measures electrical conditions and switch status for a central control system.
Feedforward 3D and 4D scene generation
Feedforward 3D and 4D scene generation is a family of generative AI methods that produce explorable 3D or dynamic 4D scenes in a single neural network pass.
Feedforward control
Feedforward control is a control strategy that measures a disturbance and corrects for it before it affects the process output, preventing errors rather than fixing them.
Feedforward neural network
A feedforward neural network, also called a feedforward network or multilayer perceptron (MLP), is a machine learning model with layered functions connected in one direction and no feedback.
FEFLOW
FEFLOW (Finite Element subsurface FLOW system) is commercial software simulating groundwater flow, contaminant transport, and heat transport in 2D and 3D, now developed by DHI.
Fehmarn Belt fixed link
The Fehmarn Belt fixed link (Femern Bælt-forbindelsen) is an 18-kilometer immersed road-and-rail tunnel under construction between Lolland, Denmark, and Fehmarn, Germany, expected to open in 2029.
Fei-Fei Li (李飞飞)
Fei-Fei Li (李飞飞), also known as Li Feifei, is a Stanford computer scientist who created ImageNet and the ImageNet Challenge, and now leads World Labs, which builds spatially intelligent 3D world models.
Feishu
Feishu (飞书) is ByteDance's enterprise collaboration platform, integrating instant messaging, cloud documents, calendar, video conferencing, and email in one suite; its international counterpart is Lark, a separate service.
Feldbahn
A Feldbahn, also called a Lorenbahn or field railway, is a simple narrow-gauge railway, usually not open to the public, used to move agricultural, forestry, and industrial materials.
Félicette
Félicette was a black-and-white cat who became the first cat launched into space, flying a French suborbital mission from Algeria on 18 October 1963 and returning alive.
Felipe Ángeles International Airport
Felipe Ángeles International Airport (AIFA, IATA code NLU) is Mexico City's second international airport, opened on the former Santa Lucía military air base in 2022 to relieve congestion at AICM.
Felix Baumgartner
Felix Baumgartner (1969 to 2025) was an Austrian skydiver who jumped from a helium balloon over New Mexico in 2012, becoming the first person to break the sound barrier in freefall.
Felix F. Wu
Felix F. Wu, also known as Felix Fulih Wu, is an electrical engineer elected to the National Academy of Engineering in 2026 for power system stability methods.
Felix Lang
Felix Lang is a German physicist who leads the ROSI group at the University of Potsdam; his perovskite tandem solar cells flew on the maiden Ariane 6 launch in 2024.
Félix Lucas
Félix Lucas, full name Félix Benjamin Lucas, was a French civil engineer of the Ponts et Chaussées corps, 1836 to 1914, known for the Gauss–Lucas theorem.
Felix Pollaczek
Félix Pollaczek (1892–1981) was an Austrian-French engineer and mathematician, a pioneer of queueing and teletraffic theory best known for the Pollaczek–Khinchine formula, derived in 1930.
Félix Trombe
Félix Trombe (1906–1985) was a French engineer-chemist and CNRS research director who built the world's first solar furnace at Mont-Louis in 1949 and invented the Trombe wall.
Felix Wankel
Felix Heinrich Wankel (1902–1988) was a largely self-taught German inventor who conceived the Wankel rotary piston engine, a triangular-rotor engine developed at NSU and mass-produced by NSU and Mazda.
Fels-Naptha
Fels-Naptha is an American laundry bar soap and stain remover introduced in 1894 by Fels & Company of Philadelphia, originally made with naphtha, a grease-cutting petroleum solvent.
FEM (materials handling federation)
FEM, formally the European Materials Handling Federation (Fédération Européenne de la Manutention), is a Brussels-based trade association founded in 1953 that represents European manufacturers of materials handling, lifting, and storage equipment.
FEMA P-695
FEMA P-695, Quantification of Building Seismic Performance Factors, is a 2009 FEMA report that sets a probabilistic methodology for quantifying seismic performance factors of building lateral systems.
Femto-photography
Femto-photography is an ultrafast imaging technique developed at MIT that captures movies of laser pulses traveling through a scene, at about half a trillion frames per second.
Femtosecond laser ablation
Femtosecond laser ablation is a machining method using laser pulses shorter than a picosecond to vaporize material with minimal heat damage, used on stents, smartphone glass, and solar cells.