42,772 articles
PSR J1023+0038
PSR J1023+0038, or J1023, is a transitional millisecond pulsar discovered in 2009, the first of its class, orbiting a low-mass companion every 4.75 hours.
PSR J1119-6127
PSR J1119-6127 is a young, high-magnetic-field radio pulsar about 8.4 kpc from Earth, discovered in 2000 at Parkes, and the first rotation-powered radio pulsar seen having a magnetar-like outburst, in 2016.
PSR J1550-5418
PSR J1550-5418 is a magnetar, a highly magnetized neutron star, at the center of the supernova remnant candidate G327.24-0.13, with radio pulsations discovered in 2007.
PSR J1614-2230
PSR J1614-2230 is a binary millisecond pulsar in an 8.69-day orbit around a white dwarf, best known for the 2010 measurement of its mass near two solar masses.
PSR J1713+0747
PSR J1713+0747 is a millisecond pulsar discovered in 1993 at the Arecibo telescope, in a 67.8-day orbit with a white dwarf and one of the most precisely timed pulsars known.
PSR J1719-1438
PSR J1719-1438, the "diamond planet" pulsar, is a 5.7 ms millisecond pulsar 1,200 pc away with a Jupiter-mass, ultra-low-mass carbon white dwarf companion in a 2.2-hour orbit, discovered by Bailes et al. in 2011.
PSR J1745-2900
PSR J1745-2900, also cataloged as SGR J1745−2900, is a magnetar, a neutron star powered by magnetic field decay, orbiting within 0.1 parsecs of the Milky Way's central black hole, Sagittarius A.
PSR J1824-2452A
PSR J1824-2452A, also cataloged as PSR B1821-24 and often called M28A, is an isolated millisecond pulsar in the core of the globular cluster Messier 28 in Sagittarius, discovered in 1987.
PSR J1846-0258
PSR J1846-0258 is a young, radio-quiet X-ray pulsar discovered in 2000 at the center of the supernova remnant Kes 75, known for magnetar-like outbursts in 2006 and 2020.
PSR J1915+1606
PSR J1915+1606, also known as PSR B1913+16 or the Hulse–Taylor binary pulsar, is a 59-millisecond pulsar orbiting another neutron star, discovered at Arecibo in 1974.
PSR J2322-2650
PSR J2322-2650 is a rapidly spinning millisecond pulsar hosting a Jupiter-mass planet that orbits it every 7.75 hours, discovered in 2011 with the Parkes telescope.
Psychedelic drug
A psychedelic drug, also called a serotonergic psychedelic, is a psychoactive substance that profoundly alters perception and cognition; classical examples are LSD, psilocybin, mescaline, and DMT.
Psychoacoustics
Psychoacoustics is the experimental study of auditory sensation, quantifying how sound pressure level, frequency, and timing map onto the loudness, pitch, and timbre a listener reports.
Psychological testing
Psychological testing, also known as mental testing, is the use of standardized psychometric tests to measure intelligence, aptitudes, personality, and emotional functioning in clinical, educational, and workplace settings.
Psychometrics
Psychometrics is the field of psychological measurement, covering test design, validity, reliability, fairness, classical test theory, item response theory, and computerized adaptive testing in education, clinical, and workplace assessment.
Psychophysical methods
Psychophysical methods are experimental procedures for measuring perception by presenting controlled stimuli and recording observers' reports, estimating detection thresholds and just-noticeable differences through classical and adaptive trial designs.
Psychophysics
Psychophysics is the quantitative study of how physical stimuli relate to sensation and perception, founded by Gustav Fechner, whose 1860 Elemente der Psychophysik defined the field.
Pt nanoparticle size effect in ORR
The Pt nanoparticle size effect in ORR is the dependence of platinum's oxygen reduction activity on particle diameter, strongest below 5 nm, with mass activity peaking around 2-4 nm.
Pt1/FeOx single-atom catalyst
Pt1/FeOx is a single-atom catalyst of isolated positively charged platinum atoms on iron oxide, reported in 2011 as the first practical single-atom catalyst, active for CO oxidation.
Pteridine
Pteridine is an aromatic heterocyclic organic compound with the molecular formula C₆H₄N₄, consisting of a pyrimidine ring fused to a pyrazine ring, parent to pterins and the cofactors tetrahydrofolate and tetrahydrobiopterin.
Pterostilbene
Pterostilbene is a plant stilbenoid, specifically 3′,5′-dimethoxy-4′-hydroxystilbene, a resveratrol analog with two methoxy groups, produced by plants as a phytoalexin and found in blueberries, grapes, and mulberries.
PtGa
PtGa, or platinum gallide, is a chiral topological semimetal made of platinum and gallium, notable for the strongest spin-orbit coupling of any chiral crystal and for hosting multifold fermions.
Ptolemy (Κλαύδιος Πτολεμαῖος)
Claudius Ptolemy (Κλαύδιος Πτολεμαῖος) was a Greek-speaking astronomer and geographer of Roman Egypt who worked in Alexandria in the second century AD and wrote the Almagest, the standard astronomy handbook until the sixteenth century.
Ptychographic microscopy
Ptychographic microscopy is a lensless computational imaging method that reconstructs an image from overlapping diffraction patterns, delivering deep sub-ångström resolution in electron microscopy and nanoscale X-ray tomography.
Ptychographic X-ray computed tomography
Ptychographic X-ray computed tomography (PXCT) is a lensless X-ray imaging technique combining ptychography with computed tomography to reconstruct 3D electron density at nanometer resolution, first demonstrated in 2010.
Ptychographic X-ray laminography
Ptychographic X-ray laminography (PyXL) is a non-destructive X-ray imaging technique producing nanoscale 3D images of flat samples, demonstrated in 2019 on integrated circuits at 18.9 nm resolution.
Ptychographic X-ray tomography
Ptychographic X-ray tomography is a lensless 3D X-ray imaging method that scans a focused beam and reconstructs quantitative electron density, achieving resolutions better than 15 nm.
Ptychography
Ptychography is a lensless coherent-diffraction imaging method that scans a probe across a specimen, records overlapping diffraction patterns, and computationally reconstructs amplitude and phase at high resolution.
Puberphonia
Puberphonia, also called mutational falsetto or mutational dysphonia, is a functional voice disorder in which adolescent and adult males continue speaking at a high, prepubescent pitch after puberty.
Public address system
A public address system, or PA system, is an electronic system of microphones, amplifiers, and loudspeakers that makes a voice or music audible to large audiences.