All articles starting with P
28,818 articles
PRECISION study
PRECISION (Pain Registry for Epidemiological, Clinical, and Interventional Studies and Innovation) is a University of North Texas Health Science Center registry, established 2016, enrolling chronic low back pain cases and pain-free controls with a saliva and blood biobank for pharmacogenetic opioid-versus-NSAID research.
Precision Time Protocol
The Precision Time Protocol (PTP) is a network protocol defined by IEEE 1588 that synchronizes device clocks over packet networks to accuracies around 100 nanoseconds.
Precision-aim and throwing sports
Precision-aim and throwing sports are sports in which a competitor projects an object toward a target, including bowling, darts, curling, lawn bowls, and the boules games.
Precision-guided munition
The precision-guided munition, also known as a smart munition or precision-guided weapon, is a guided weapon meant to destroy a point target while minimizing collateral damage.
Precisionism
Precisionism was an American modernist art movement of the 1920s and 1930s, often called the first originally American modernist movement, led by Charles Sheeler, Charles Demuth, and Georgia O'Keeffe.
Precocious puberty
Precocious puberty: development of secondary sex characteristics before age 8 in girls and 9 in boys; central (GnRH-dependent) versus peripheral forms, diagnosis with basal LH and MRI, GnRHa treatment, secular trends.
Precoded OFDM
Precoded OFDM is a transmission scheme in which data symbols are multiplied by a precoding matrix before OFDM modulation, lowering peak-to-average power ratio and adding multipath protection.
Precoding
Precoding is a transmitter-side signal processing technique that shapes per-antenna signals of a multi-antenna transmitter using channel state information, directing energy toward receivers and suppressing interference; it is used in LTE and 5G.
Precoding codebook feedback
Precoding codebook feedback is a limited-feedback MIMO wireless technique in which the receiver selects a precoding matrix from a shared codebook and reports only its index, enabling closed-loop transmission.
Precognition
Precognition, also called premonition, is the apparent awareness of a future event that could not be anticipated by any known process; laboratory effects are small, and replications have failed.
Precolumbian Chiefdom Settlements with Stone Spheres of the Diquís
Precolumbian Chiefdom Settlements with Stone Spheres of the Diquís (Asentamientos Cacicales Precolombinos con Esferas de Piedra de Diquís): UNESCO World Heritage Site, Costa Rica, 2014; four sites, Finca 6, Batambal, El Silencio, Grijalba-2, AD 500-1500 chiefdoms, spheres up to 2.66 m.
Precombustion chamber
A precombustion chamber is a small auxiliary combustion chamber, connected to an engine cylinder by a narrow passage, in which fuel is first partly burned.
Preconception Care
Preconception care (prepregnancy care) is organized health care before conception that assesses risks, promotes health, and intervenes to improve pregnancy outcomes. Key elements: folic acid, vaccinations, chronic disease optimization, substance-use counseling; 40% of pregnancies are unplanned.
Preconditioner
A preconditioner is a matrix, or any linear operator, applied to a linear system to give it better spectral properties so iterative methods converge faster.
Precordial catch syndrome
Precordial catch syndrome, also called Texidor's twinge or chest wall twinge syndrome, is a benign, brief (seconds to 3 minutes) sharp left-sided chest pain worsened by deep breathing, common in children and young adults, unrelated to heart or lung disease.
Precordial pain
Precordial pain, also precordialgia, is chest pain in the precordium, the anterior chest wall over the heart. A topographic symptom, not a diagnosis; about half of cases are noncardiac, and ICD-11 code is MC86.
Precursor B cell
Precursor B cell (pre-B cell, CL:0000817): a CD10-positive immature B lymphocyte developing in bone marrow through pro-B and pre-B stages via immunoglobulin gene rearrangement and the pre-BCR checkpoint; cell of origin of precursor B-cell ALL.
Precursor cathode active material
Precursor cathode active material (pCAM) is a mixed nickel-cobalt-manganese hydroxide intermediate from which lithium-ion battery cathode powder is made by lithiation and calcination; it is produced almost entirely by co-precipitation.
Precursor cell
Precursor cell (CL:0011115) is a Cell Ontology term for any cell that, by division or terminal differentiation, gives rise to other cell types; broader than progenitor cell, distinct from self-renewing stem cells, and used inconsistently across fields.
Precursor Ventures
Precursor Ventures is a pre-seed-only venture capital firm in San Francisco, founded by Charles Hudson around 2015 to invest in software and hardware startups' first institutional rounds.
Predation
Predation: predators kill and consume prey; studied via Lotka–Volterra dynamics, Holling functional responses, trophic cascades, predation pressure measurement, and climate-driven shifts in predator–prey overlap.
Predation of honey bees by the Asian giant hornet
The Asian giant hornet preys on honey bees by scouting, marking, and mass-attacking hives, killing thousands of bees within hours; European honey bees lack defenses.
Predator (fictional species)
Predator (Yautja) is the fictional extraterrestrial trophy-hunting species from the 1987 film Predator and its sequels, crossovers with Alien, comics, and games, known for cloaking, thermal vision, plasma weapons, and hunting culture.
Predator (film)
Predator is a 1987 American science-fiction action-horror film directed by John McTiernan, in which Arnold Schwarzenegger's commando team is picked off by an alien hunting humans for sport.
Predator (franchise)
Predator franchise: American sci-fi action-horror media franchise begun with Predator (1987), centered on the Yautja alien hunters; spans seven mainline films, Alien vs. Predator crossovers, Dark Horse then Marvel comics, and Disney-era entries Prey, Killer of Killers, and Badlands.
Predator 2
Predator 2 (1990), directed by Stephen Hopkins, is the sequel to Predator, moving the alien hunter to 1997 Los Angeles amid a heat wave and drug war, with Danny Glover as Lt. Mike Harrigan; it underperformed critically but gained a cult following.
Predator Circus
Predator Circus (Cirque des Fauves, سيرك الحيوانات المفترسة) is a big-cat and carnivore exhibit zone at Ben Aknoun Zoo in Algiers, Algeria, opened with the park in 1982, not a performing circus.
Predator: Badlands
Predator: Badlands (2025) is a Dan Trachtenberg sci-fi action film, the first Predator movie with a Yautja protagonist: outcast Dek allies with Elle Fanning's severed android Thia on planet Genna to hunt the Kalisk; it earned $184.5 million worldwide.
Predator: Hunting Grounds
Predator: Hunting Grounds (プレデター ハンティング グラウンズ) is IllFonic's 4-vs-1 asymmetric shooter based on the Predator films, launched April 24, 2020 on PS4/PC via Sony Interactive Entertainment and rebooted October 1, 2024 on PS5/Xbox Series with 20th Century Games.
Predator: Killer of Killers
Predator: Killer of Killers is a 2025 animated anthology Predator film on Hulu, directed by Dan Trachtenberg and Josh Wassung, following a Viking, a ninja, and a WWII pilot hunted by Yautja, later arena-fought on the Predator homeworld.