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Phasor estimation
Phasor estimation is a signal-processing method that computes the magnitude and phase angle of fundamental-frequency voltage or current waveforms, used in power system monitoring, control, and protection.
Phasor measurement unit
A phasor measurement unit, also called a synchrophasor device, is a precision instrument that measures voltage and current phasors and frequency in power grids with GPS time-stamping.
Phénix
Phénix was a French demonstration sodium-cooled fast breeder reactor at the Marcoule nuclear site in southern France, operated by the CEA and EDF, which produced power from 1973 to 2010.
Phenolic impregnated carbon ablator
The phenolic impregnated carbon ablator (PICA) is a low-density heat shield material developed at NASA Ames in the 1990s, flown on Stardust, Curiosity, OSIRIS-REx, and Mars 2020.
Phenom II
Phenom II is a family of AMD desktop processors launched in January 2009 as a 45 nm die shrink of the original Phenom, with an integrated memory controller.
Phi (small language model family)
Phi is a family of small language models developed by Microsoft, running from Phi-1 through Phi-4, built on curated textbook-quality training data and used on phones, laptops, and Copilot+ PCs.
Phi-3
Phi-3 is a family of open small language models developed by Microsoft, first released in April 2024 with phi-3-mini, a 3.8 billion parameter model rivals said competed with GPT-3.5.
Phi-4
Phi-4 is a 14-billion-parameter large language model released by Microsoft in December 2024, trained mostly on synthetic data to match larger models on math and STEM reasoning.
Phidgets
Phidgets are programmable USB sensors and control boards made by Phidgets Inc., letting software interact with the physical world without custom electronics; they are used in education and interface research.
Phil Harris (fisherman)
Phil Harris, also known as Captain Phil Harris, was an American crab fisherman who captained the Cornelia Marie on Deadliest Catch until his death in 2010.
Phil Spencer (business executive)
Phil Spencer, also known as XboxP3, is an American executive who led Xbox and Microsoft Gaming for 12 years, retiring in February 2026 after 38 years at Microsoft.
Phil Zimmermann
Phil Zimmermann (Philip R. Zimmermann) is an American cryptographer who created PGP in 1991, faced a US criminal investigation over its export, and later founded PGP Inc. and Silent Circle.
Philadelphia City Hall
Philadelphia City Hall, the seat of Philadelphia's municipal government, was built from 1871 to 1901 and remains the largest city hall in the United States.
Philadelphia Experiment
The Philadelphia Experiment, also called the Philadelphia Project, is an alleged secret United States Navy experiment said to have rendered the destroyer escort USS Eldridge invisible in 1943.
Philadelphia International Airport
Philadelphia International Airport (PHL) is the major airport serving Philadelphia, Pennsylvania, located about 7 miles from downtown and serving as a connecting hub and leading transatlantic gateway for American Airlines.
Philadelphia Main Line
The Philadelphia Main Line is a string of affluent suburban communities northwest of Philadelphia that grew up around Pennsylvania Railroad stations from Overbrook to Paoli, starting in the 1870s.
Philadelphia Water Works
The Philadelphia Water Works is the municipal water supply system Philadelphia began operating in 1801, one of the first city-owned systems in the United States.
Philae (spacecraft)
Philae was a comet lander carried by the European Space Agency's Rosetta spacecraft, and in 2014 it became the first spacecraft to land on a comet nucleus.
Philco TRANSAC S-2000
The Philco TRANSAC S-2000 is an all-transistor mainframe computer introduced by the Philco Corporation of Philadelphia in 1957, generally regarded as the first transistorized scientific computer sold by a manufacturer.
Philip A. Thompson
Philip A. Thompson was an American mechanical engineer who taught at Rensselaer Polytechnic Institute, wrote the 1972 textbook Compressible-Fluid Dynamics, and discovered liquefaction shock waves; he died in 2001.
Philip B. Crosby
Philip Bayard Crosby was an American quality-management practitioner and author who originated zero defects, defined quality as conformance to requirements, and wrote Quality Is Free in 1979.
Philip Barkan
Philip Barkan (1925–1996) was an American mechanical engineer with 51 circuit-breaker patents at General Electric who became a Stanford professor and pioneer of design for manufacturability.
Philip C. Singer
Philip C. Singer (born 1942) is an American environmental engineer and professor emeritus at the University of North Carolina at Chapel Hill, a leading authority on drinking-water disinfection by-products.
Philip Don Estridge
Philip Don Estridge, also known as Don Estridge, was an American computer engineer at IBM who led the team that created the original IBM Personal Computer in 1981.
Philip Feng
Philip X.-L. Feng is an electrical engineer known for nanoelectromechanical systems built from atomically thin 2D materials such as molybdenum disulfide, and a 2016 PECASE recipient.
Philip G. Hodge
Philip G. Hodge (1920–2014) was an American mechanical engineer and applied mathematician who advanced plasticity theory, taught at Illinois Tech and Minnesota, and received the ASME Medal in 1987.
Philip H. S. Torr
Philip H. S. Torr, also cited as Philip Torr, is a British computer vision researcher who holds a research chair at the University of Oxford and leads the Torr Vision Group.
Philip Johnson
Philip Johnson (Philip Cortelyou Johnson, 1906–2005) was an American architect who introduced European modernism to the United States and built the Glass House in New Canaan, Connecticut.
Philip Johnston (entrepreneur)
Philip Johnston, born in 1986 in Guildford, UK, is a British entrepreneur and co-founder and CEO of Starcloud, a space technology company building data centers in orbit.
Philip Lett
Philip Lett (1922–2014) was an American mechanical engineer called the "Father of the M1 Tank" for leading the M1 Abrams tank's design, development, and production at Chrysler.