Physical world and mathematics

N,N'-Methylenebisacrylamide

N,N'-Methylenebisacrylamide (Bis, BIS, MBA, MBAA; CAS 110-26-9) is a bifunctional acrylamide whose two vinyl groups crosslink polyacrylamide chains, forming gels for electrophoresis and hydrogels.

N. Bruce Hannay

N. Bruce Hannay, born Norman Bruce Hannay, was an American physical chemist at Bell Telephone Laboratories whose research on silicon contributed to the silicon transistor program.

N. Gabriel Lemcoff

N. Gabriel Lemcoff, born in Buenos Aires in 1969, is an Israeli organic chemist and dean at Ben-Gurion University known for sulfur-chelated ruthenium metathesis catalysts activated by heat or light.

N. Peter Armitage

N. Peter Armitage, also published as N. P. Armitage, is a professor of physics and astronomy at Johns Hopkins University known for terahertz spectroscopy of quantum materials.

N. Sanjay Rebello

N. Sanjay Rebello is a physics education researcher and professor at Purdue University who received a PECASE award for studying students' mental models of everyday devices.

N=4 supersymmetric Yang–Mills theory

N=4 supersymmetric Yang–Mills theory, often written N=4 SYM, is a maximally supersymmetric quantum field theory in four dimensions, known for its finiteness, S-duality, and its role in the AdS/CFT correspondence.

Na2BaCo(PO4)2

Na2BaCo(PO4)2, often abbreviated NBCP, is a synthetic phosphate in which spin-1/2 cobalt ions form a perfect triangular lattice, making it a model compound for frustrated quantum magnetism.

Na2Co2TeO6

Na2Co2TeO6 (NCTO) is a layered sodium cobalt tellurate in which Co2+ ions form a honeycomb lattice, studied as a candidate Kitaev quantum spin liquid that orders antiferromagnetically near 27 K.

Na2Ti3O7

Na2Ti3O7 (sodium trititanate) is a layered sodium titanate used as a low-voltage anode for sodium-ion batteries, first reported in 2011, with a 0.3 V operating voltage and a theoretical capacity of 178 mAh g⁻¹.

Na3Bi

Na3Bi (trisodium bismuthide) is an inorganic compound of sodium and bismuth, the first experimentally verified topological Dirac semimetal, a 3D analog of graphene hosting bulk Dirac fermions, confirmed by ARPES in 2014.

NA61/SHINE

NA61/SHINE (SPS Heavy Ion and Neutrino Experiment) is a CERN fixed-target experiment at the Super Proton Synchrotron studying hadron production in beam collisions with nuclear targets.

NA62 experiment

NA62 is a fixed-target particle physics experiment at CERN's Super Proton Synchrotron studying rare kaon decays, especially the ultra-rare decay of a kaon into a pion and two neutrinos.

NA64

NA64, or North Area experiment 64, is a CERN particle physics experiment at the Super Proton Synchrotron that searches for dark photons, axion-like particles, and light dark matter.

NAAMES

NAAMES, the North Atlantic Aerosols and Marine Ecosystems Study, was a NASA field campaign studying how Atlantic plankton affect aerosols and clouds from 2015 to 2018.

Nabla symbol

The nabla symbol, also called del, is an inverted Greek delta used in vector calculus for the differential operator giving the gradient, divergence, curl, and Laplacian.

NAC Image Technology

NAC Image Technology is a Japanese manufacturer of high-speed cameras and imaging instrumentation, founded in 1958 and known for its MEMRECAM line used in crash testing and broadcast slow motion.

NACE

NACE, from the French Nomenclature statistique des activités économiques dans la Communauté européenne, is the EU statistical classification of economic activities, in use since 1970.

Oct 10, 2026

Nachman Aronszajn

Nachman Aronszajn (1907–1980) was a mathematician who worked in functional analysis and logic, taught at the University of Kansas from 1951 to 1977, and gave reproducing kernel Hilbert spaces their systematic form.

NaCl3

NaCl3 (sodium trichloride) is a sodium chloride compound with a 1:3 sodium-to-chlorine ratio, predicted computationally and synthesized under high pressure in diamond anvil cell experiments reported in 2013.

Nacre-inspired impact-resistant glass

Nacre-inspired impact-resistant glass is a transparent glass-polymer composite mimicking the brick-and-mortar microstructure of nacre, so the glass bends and dissipates energy under impact instead of shattering.

Sep 20, 2026

Nader Engheta

Nader Engheta is an Iranian-American electrical engineer and physicist, the H. Nedwill Ramsey Professor at the University of Pennsylvania, and a pioneer of metamaterials, optical nanocircuits, and near-zero-index optics.

NADH

NADH, or reduced nicotinamide adenine dinucleotide, is the reduced form of the coenzyme NAD. It carries electrons from glycolysis and the citric acid cycle into the mitochondrial electron transport chain, yielding about 2.5 ATP per molecule.

Nadir

The nadir is the point on the celestial sphere directly below an observer, exactly opposite the overhead zenith, and hidden from view by the ground.

Nadir Jeevanjee

Nadir Jeevanjee is a climate physicist at NOAA's Geophysical Fluid Dynamics Laboratory, known for analytical theories of CO2 radiative forcing and global mean precipitation, and for the 2025 PECASE award.

Nadolol

Nadolol (brand name Corgard) is a long-acting, nonselective beta blocker approved for hypertension and angina in the United States, and for migraine prophylaxis in the United Kingdom.

NADP+

NADP+, or nicotinamide adenine dinucleotide phosphate, is a coenzyme that differs from NAD+ by one phosphate group; its reduced form, NADPH, powers biosynthesis and antioxidant defense.

Nadya Mason

Nadya Mason is an American experimental condensed matter physicist studying quantum materials, superconductivity, and nanoscale systems; she is dean of the University of Chicago's Pritzker School of Molecular Engineering.

Nafion

Nafion is a perfluorinated sulfonic acid polymer membrane that conducts protons, discovered by Walther Grot at DuPont in the 1960s and used in chlor-alkali electrolysis and fuel cells.

NAG Library

The NAG Library is a commercial collection of more than 1,600 numerical and statistical algorithms developed by the Numerical Algorithms Group in Oxford, first released in 1971.