42,772 articles
Naval Oceanographic Office
The Naval Oceanographic Office (NAVOCEANO), renamed from the U.S. Navy Hydrographic Office in 1962, is the Navy's principal oceanographic command, based in Mississippi and tracing its origins to 1830.
Naval Research Laboratory
The U.S. Naval Research Laboratory (NRL) is the corporate research laboratory of the United States Navy and Marine Corps, operating in Washington, D.C. since 1923.
Navaratna (नवरत्न)
Navaratna (नवरत्न), also called Nabaratna, is an Indian jewelry arrangement of nine gemstones, each corresponding to one of the nine celestial bodies of Vedic astrology.
Navarro–Frenk–White profile
The Navarro–Frenk–White (NFW) profile, proposed in 1996 by Julio Navarro, Carlos Frenk, and Simon White, is a formula for dark matter density inside halos and a standard model in lensing studies.
Naveen Garg
Naveen Garg, born 1971, is an Indian theoretical computer scientist, chair professor at IIT Delhi, who works on approximation algorithms for scheduling and facility location and won the 2016 Shanti Swarup Bhatnagar Prize.
Navier–Stokes equations
The Navier–Stokes equations are coupled nonlinear partial differential equations describing how velocity, pressure, and density of a viscous fluid are related, derived in the early 1800s.
Navier–Stokes existence and smoothness
Navier–Stokes existence and smoothness is an open mathematics problem, one of seven Clay Millennium Prize Problems, asking whether 3D viscous fluid equations always admit unique smooth solutions.
Navin Ramankutty
Navin Ramankutty, born 1970 in India, is a geographer and sustainability scientist at the University of British Columbia who built the first global historical cropland datasets.
Navy Aerosol Analysis and Prediction System
The Navy Aerosol Analysis and Prediction System (NAAPS) is a global aerosol forecast model developed by the US Naval Research Laboratory, predicting dust, smoke, and sea salt.
Navy Global Environmental Model
The Navy Global Environmental Model (NAVGEM) is the United States Navy's global numerical weather prediction model, replacing NOGAPS as the Navy's prime forecast model in February 2013.
NaYbSe2
NaYbSe2 is a rare-earth delafossite in which Yb3+ ions form a perfect triangular lattice, making it a leading quantum spin liquid candidate free of disorder.
NaYF4:Yb/Er upconversion nanoparticles
NaYF4:Yb/Er upconversion nanoparticles are sodium yttrium fluoride nanocrystals in which ytterbium sensitizes erbium to convert 980 nm near-infrared light into green and red emission, used for background-free bioimaging.
Nazario Martín
Nazario Martín is a Spanish organic chemist, full professor at the Universidad Complutense de Madrid and deputy director of IMDEA Nanociencia, known for fullerene chemistry and molecular electronics.
Nazarov cyclization
The Nazarov cyclization is an acid-catalyzed organic reaction, named after Russian chemist I. N. Nazarov, that converts divinyl ketones into cyclopentenones through a 4π conrotatory electrocyclization.
Nazca Plate
The Nazca Plate is an oceanic tectonic plate in the southeastern Pacific, formed from the Farallon Plate about 23 million years ago, that subducts beneath South America.
Nazzareno Mandolesi
Nazzareno Mandolesi, born in 1944, is an Italian cosmologist who was Principal Investigator of the Low Frequency Instrument on ESA's Planck satellite, sharing the 2018 Gruber Prize in Cosmology.
NbFeSb
NbFeSb is a half-Heusler compound of niobium, iron, and antimony, one of the best p-type thermoelectric materials, reaching a figure of merit ZT of 1.5 at 1,200 K.
NC (complexity)
NC, also called Nick's Class, is the complexity class of decision problems solvable in polylogarithmic parallel time with polynomially many processors, regarded as efficiently parallelizable.
NCEP/NCAR Reanalysis
The NCEP/NCAR Reanalysis, also called Reanalysis 1 or R1, is a global gridded atmospheric dataset produced by NCEP and NCAR, covering 1948 to the present with a fixed assimilation system.
NCM 523
NCM 523, also written NCM523, is the layered lithium nickel cobalt manganese oxide LiNi0.5Co0.2Mn0.3O2, a lithium-ion battery cathode offering higher capacity and lower cost than NCM111.
Nd:YAG laser
The Nd:YAG laser, also written Nd-YAG, is a solid-state laser in which neodymium ions doped into an yttrium aluminum garnet crystal emit infrared light, most commonly at 1064 nm.
Nd1−xSrxNiO2
Nd1−xSrxNiO2, strontium-doped neodymium nickelate, is an infinite-layer nickelate structurally akin to cuprates; in August 2019 its Nd0.8Sr0.2NiO2 thin films became the first nickelate found to superconduct, at 9 to 15 kelvin.
Neal K. Devaraj
Neal K. Devaraj, also known as Neal Devaraj, is an American chemical biologist at UC San Diego known for building artificial cells and bioorthogonal chemistry for imaging living cells.
Neal Mankad
Neal P. Mankad is an American organometallic and bioinorganic chemist, a professor at the University of Illinois Chicago since 2012, known for catalysts pairing two cooperating metals.
Neap tide
A neap tide is a moderate tide occurring twice each lunar month, at the Moon's first and third quarters, when the Sun and Moon are at right angles to each other.
Near and far field
The near and far field are the regions around a radiating antenna or diffracting aperture: near, energy is stored and returned; far, the field becomes a plane wave.
Near-field imaging
Near-field imaging is a family of scanning-probe microscopy techniques that uses an evanescent field at a subwavelength tip or aperture to image surfaces at resolutions down to about 10 nm.
Near-field radiative heat transfer
Near-field radiative heat transfer (NFRHT) is the exchange of thermal energy between objects separated by less than the thermal wavelength, about 10 μm at room temperature.
Near-field scan
A near-field scan is an antenna measurement technique in which a small probe measures the field at short range, and a mathematical transformation yields the antenna's far-field radiation pattern.
Near-infrared imaging
Near-infrared imaging, also called NIR chemical imaging, records a near-infrared spectrum at every pixel, yielding a hyperspectral datacube that maps chemical distribution non-destructively in pharmaceutical, food, and agricultural applications.