42,772 articles
p-process
The p-process is the set of stellar nucleosynthesis mechanisms producing the rare proton-rich p-nuclei heavier than iron, mainly through the γ-process photodisintegration in core-collapse supernovae.
p-series
A p-series is an infinite series of the form 1 + 1/2^p + 1/3^p + ... with real exponent p, converging exactly when p > 1 and otherwise diverging.
P-Toluenesulfonic acid
p-Toluenesulfonic acid, also called tosic acid or TsOH, is a strong aromatic sulfonic acid with a methyl group para to the sulfonic acid group, used as a catalyst in organic synthesis.
P-value
The p-value is the probability, assuming the null hypothesis is true, of a result at least as extreme as the observed one; small values are evidence against the null.
P-wave tomography
P-wave tomography is a seismic imaging method that inverts compressional wave travel times from millions of earthquakes to build 3-D models of P-wave velocity variations inside the Earth, from dense arrays to the whole mantle.
P-Xylene
P-Xylene, also known as para-xylene or p-xylol, is an aromatic hydrocarbon and one of the three xylene isomers, oxidized industrially to terephthalic acid for polyester fiber production.
P. A. P. Moran
P. A. P. Moran, full name Patrick Alfred Pierce Moran, was an Australian statistician who introduced Moran's I, the standard measure of spatial autocorrelation, in 1948.
P. Andrew Evans
P. Andrew Evans is an organic chemist and professor at Queen's University whose research develops rhodium-catalyzed cross-coupling reactions and applies them to natural product synthesis.
P. Buford Price
P. Buford Price (1932–2021) was an American nuclear and cosmic-ray physicist at UC Berkeley who co-invented the track-etch technique and helped found the AMANDA neutrino observatory.
P. James Schuck
P. James Schuck is a nano-optics researcher and professor of mechanical engineering at Columbia University since 2017, known for upconverting nanoparticle microlasers and photon-avalanching nanocrystals.
P. Jeffrey Hay
P. Jeffrey Hay is a theoretical chemist at Los Alamos National Laboratory whose 1985 effective core potentials and basis sets became standard tools for quantum-chemical calculations on heavy elements.
P. Jonathan Patchett
P. Jonathan Patchett, also published as P. J. Patchett, is an isotope geochemist and emeritus professor at the University of Arizona known for establishing the Lu–Hf dating system.
P. R. Wallace
P. R. Wallace (Philip Russell Wallace, 1915–2006) was a Canadian theoretical physicist at McGill University whose 1947 paper first derived the electronic band structure of graphene, a single graphite layer.
P. Shiv Halasyamani
P. Shiv Halasyamani is an inorganic and materials chemist at the University of Houston, known for the 1998 review "Noncentrosymmetric Oxides" and for designing beryllium-free deep-ultraviolet nonlinear optical crystals.
P. St. J. Russell
P. St. J. Russell, or Philip St. John Russell, is a British physicist who invented photonic crystal fiber and was a founding Director of the Max Planck Institute for the Science of Light.
P. van der Werf
Paul van der Werf is an astronomer and Professor of Extragalactic Astrophysics at Leiden University's Leiden Observatory, studying star formation, molecular gas, and the interstellar medium of galaxies.
P.E. LaMoreaux
Philip E. LaMoreaux, Sr. (1921–2008) was an American hydrogeologist who led the USGS Ground Water Branch, served as Alabama's state geologist, founded the consulting firm PELA, and joined the National Academy of Engineering in 1987.
P2 experiment
The P2 experiment is a particle physics experiment under construction at Johannes Gutenberg University Mainz that will measure the Standard Model's weak mixing angle to about 0.14% precision.
PA degree
A PA degree is a Turing degree that computes a complete, consistent extension of Peano Arithmetic; equivalently, one computing a path through every nonempty Pi-0-1 class.
Pablo Alonso‐González
Pablo Alonso-González is a Spanish nanooptics physicist who leads the Quantum Nano-optics group at the Universidad de Oviedo, known for the first nanometric-precision imaging of guided light in graphene.
Pablo G. Debenedetti
Pablo G. Debenedetti is an Argentine-born American chemical engineer at Princeton University, elected to the National Academy of Engineering in 2000 and known for the singularity-free theory of supercooled water.
Pablo Jarillo Herrero
Pablo Jarillo-Herrero, born 1976 in Valencia, Spain, is a Spanish experimental condensed matter physicist at MIT whose 2018 discovery of superconductivity in magic-angle twisted bilayer graphene founded twistronics.
Pacaya
Pacaya, also known as Pacaya volcano, is a basaltic stratovolcano in southern Guatemala, about 25 km from Guatemala City, that has erupted nearly continuously since 1961 and dropped ash on the capital in 2010.
Pace (unit)
The pace, or Roman pace, is a unit of length based on a human step or stride, used from antiquity to measure distance by walking.
Pacific Marine Environmental Laboratory
The Pacific Marine Environmental Laboratory is a NOAA oceanographic research laboratory in Seattle, Washington, founded in 1973, known for DART tsunami buoys and research on ocean acidification and climate.
Pacific Meridional Mode
The Pacific Meridional Mode is a leading ocean-atmosphere pattern in the northeastern subtropical Pacific, identified in 2004, whose warm anomalies extend from Baja California toward the equator.
Pacific Northwest National Laboratory
Pacific Northwest National Laboratory is a U.S. Department of Energy national laboratory in Richland, Washington, operated by Battelle, which took over the Hanford Laboratories in 1965.
Pacific Northwest Seismic Network
The Pacific Northwest Seismic Network (PNSN), run by the University of Washington, monitors earthquakes and volcanoes across Washington and Oregon and feeds the USGS ShakeAlert early warning system.
Pacific Northwest windstorm
A Pacific Northwest windstorm is a strong midlatitude cyclone that hits Oregon, Washington, and southern British Columbia with damaging winds, most often between November and February.
Pacific Plate
The Pacific Plate is the largest oceanic tectonic plate on Earth, underlying most of the Pacific Ocean. Its subduction zones produce most of the world's largest earthquakes.