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Partial oxidation
Partial oxidation is an exothermic reforming process in which a hydrocarbon fuel reacts with limited oxygen, producing synthesis gas, a mixture of hydrogen and carbon monoxide.
Partial redundancy elimination
Partial redundancy elimination (PRE) is a compiler optimization that removes computations redundant on some, but not all, execution paths, subsuming common subexpression elimination and loop-invariant code motion.
Partial response maximum likelihood
Partial response maximum likelihood (PRML) is a signal detection method for storage and communication channels that decodes controlled intersymbol interference using a Viterbi detector.
Partial transmit sequence
Partial transmit sequence (PTS) is a distortionless technique for reducing the peak-to-average power ratio (PAPR) of OFDM signals, proposed by S.H. Müller and J.B. Huber in 1997.
Partially oriented yarn
Partially oriented yarn (POY), also called pre-oriented yarn, is a synthetic filament yarn, spun at high speed with incomplete orientation, used mainly to make draw textured yarn.
Participatory sensing
Participatory sensing is a data collection method in mobile computing, introduced in 2006, in which volunteers use mobile phones to gather and share local environmental measurements.
Particle board
Particle board, also called chipboard, is an engineered wood panel made from wood particles, such as sawdust and chips, bonded with resin and hot-pressed into sheets.
Particle damper
A particle damper is a passive vibration-control device, a cavity of small granular particles fixed to a structure, that dissipates vibration energy through inelastic collisions and friction.
Particle Photon
Particle Photon is a $19 Wi-Fi development board for the Internet of Things, announced by Particle in 2014 as the successor to the Spark Core.
Particle receiver
A particle receiver is a type of solar receiver for concentrating solar power in which falling sand-like particles, rather than fluid in tubes, absorb sunlight and store heat above 700 °C.
Particle swarm optimization
Particle swarm optimization (PSO) is a population-based metaheuristic algorithm introduced by James Kennedy and Russell Eberhart in 1995, inspired by the social behavior of bird flocks and fish schools.
Particle system
A particle system is a computer graphics technique modeling effects like fire, smoke, and explosions as many small particles, introduced by William T. Reeves in 1983.
Partition (database)
A partition in a database is one of the smaller physical pieces into which a large table is divided, stored and managed separately while remaining one logical table to queries.
Partition problem
The partition problem asks whether a multiset of positive integers can be divided into two subsets with equal sums. It is a classical NP-complete problem, proved by Karp in 1972.
Partitioned global address space
The partitioned global address space (PGAS) is a parallel programming model where processes share one global address space partitioned across the memories of participating processors.
Partitioned Zone (Saudi Arabia–Kuwait)
The Partitioned Zone, also called the Neutral Zone, is an area between Kuwait and Saudi Arabia left undivided by the 1922 Uqair Convention, with oil wealth shared.
Partitioning and transmutation
Partitioning and transmutation (P&T) is a proposed nuclear fuel cycle that separates long-lived actinides from spent fuel and fissions them into shorter-lived products, reducing waste radiotoxicity.
Party City
Party City is an American party supplies brand founded in 1986 in East Hanover, New Jersey; after closing roughly 700 stores in early 2025, it relaunched inside Staples stores in 2026.
Party line (telephony)
A party line, or party line service, is a telephone line shared by two or more subscribers, each with a distinct ring or number suffix, common in rural service.
Party wall
A party wall is a dividing wall shared by two properties with separate owners, standing astride the boundary or wholly on one owner's land separating the buildings.
Parviz Moin
Parviz Moin is a Stanford mechanical engineering professor who pioneered direct numerical and large-eddy simulation of turbulence and founded the Center for Turbulence Research in 1987.
Parys Mountain
Parys Mountain (Mynydd Parys), Anglesey, Wales: a Bronze Age-to-1911 copper mine and volcanogenic massive sulphide zinc-lead-copper deposit; world's largest copper mine around 1800, now an Anglesey Mining plc project.
PAS (satellite series)
PAS (PanAmSat) was a geostationary communications satellite series begun with PAS-1 in 1988, the first private challenge to Intelsat, renamed Galaxy or Intelsat in 2007.
Pasadena Refinery
The Pasadena Refinery is a Chevron-owned oil refinery in Pasadena, Texas, on the Houston Ship Channel, built in 1919 with a capacity of 125,000 barrels per day.
Pascack Valley Line
The Pascack Valley Line is an NJ Transit commuter rail line from Spring Valley, New York, to Hoboken Terminal via Hackensack, operated under contract with Metro-North Railroad.
Pascal (microarchitecture)
Pascal is a GPU microarchitecture developed by Nvidia, announced in 2016 as Maxwell's successor. Its chips include the datacenter GP100 and the GP104 behind the GeForce GTX 10 series.
Pascal (programming language)
Pascal, also known as the Pascal language, is a strongly typed procedural programming language designed by Niklaus Wirth at ETH Zurich, first implemented in 1970 and standardized as ISO 7185.
Pascal Fua
Pascal Fua is a Swiss computer vision researcher, professor at EPFL, and head of its Computer Vision Laboratory, known for the EPnP algorithm and object tracking.
PASCAL VOC
PASCAL VOC was a series of annual computer vision benchmark challenges run from 2005 to 2012, pairing annotated image datasets with standardized evaluation; its 20 object classes and detection metric remain in wide use.
Pascaline
The Pascaline, also called the machine arithmétique, is a mechanical calculating machine invented by Blaise Pascal in 1642 to help his father, a Normandy tax commissioner, with arithmetic.