All articles starting with N
16,460 articles
Non-zero dispersion-shifted fiber
Non-zero dispersion-shifted fiber (NZDSF) is single-mode optical fiber, standardized as ITU-T G.655, whose zero-dispersion wavelength is shifted outside the 1550-nm window to suppress four-wave mixing in dense WDM systems.
Non, je ne regrette rien
Non, je ne regrette rien: French chanson by Charles Dumont (music) and Michel Vaucaire (lyrics), composed 1956, recorded by Édith Piaf 10 November 1960; her last big hit, dedicated to the Foreign Legion, later used in Inception and La Haine.
Nona Gaprindashvili (ნონა გაფრინდაშვილი)
Nona Gaprindashvili (ნონა გაფრინდაშვილი), born 1941 in Zugdidi, Georgian chess Grandmaster, fifth Women's World Champion 1962–1978 and first woman awarded the FIDE Grandmaster title (1978); also 11-time Olympiad champion and senior world champion eight times.
Nona Gaye
Nona Gaye (Nona Marvisa Gaye), American singer, former model, and retired actress born 1974, daughter of Marvin Gaye; released Love for the Future (1992), played Belinda Ali in Ali (2001) and Zee in the Matrix sequels.
Nona Parker Johnson
Nona Parker Johnson is an American actress, USC MFA Acting 2020 and Georgetown BA graduate, best known as undercover Detective Carmen 'Nova' Riley on Law & Order: Organized Crime, with roles in The Handmaid's Tale, Mayor of Kingstown, Fear the Walking Dead, Sugar, and Dexter: Resurrection.
Nonacho
Nonacho Lake, Northwest Territories, Canada: 784 km2 glacial scour lake, 8th largest in NWT, largest lake in the Taltson River basin, dam-regulated for Taltson hydroelectricity, with fly-in fishing from Yellowknife.
Nonacog beta pegol
Nonacog beta pegol (N9-GP; Rebinyn, Refixia) is Novo Nordisk's glycoPEGylated extended half-life recombinant factor IX for hemophilia B, with a 40 kDa PEG on the activation peptide, ~107–111 h half-life, FDA-approved 2017.
Nonadiabatic coupling
Nonadiabatic coupling is the set of terms in the molecular Schrödinger equation that couple different electronic states, arising from the nuclear kinetic energy operator and driving transitions between adiabatic potential energy surfaces.
Nonadiabatic dynamics simulation
Nonadiabatic dynamics simulation is a computational method in theoretical chemistry that models coupled nuclear-electron motion on excited-state potential energy surfaces, chiefly by trajectory surface hopping.
Nonagon
A nonagon, also called an enneagon or 9-gon, is a polygon with nine sides and nine angles totaling 1260°; the regular form cannot be constructed with compass and straightedge.
Nonallergic rhinitis
Nonallergic rhinitis (NAR), also called nonallergic rhinopathy or vasomotor rhinitis, is chronic nasal congestion, rhinorrhea, and sneezing without allergen sensitization or infection; diagnosed by exclusion with negative allergy tests, treated with intranasal corticosteroids, antihistamines, ipratropium, or nerve ablation.
Noname (rapper)
Noname (Fatimah Nyeema Warner), Chicago rapper and poet known for Telefone (2016), Room 25 (2018), and Sundial (2023), her 2013 Acid Rap feature on "Lost," and the Noname Book Club.
Nonanal
Nonanal, also called pelargonaldehyde or nonanaldehyde, is a nine-carbon fatty aldehyde with a rose-orange odor, found in rose and citrus oils and used as a flavoring agent.
Nonane
Nonane, also known as n-nonane, is a straight-chain alkane with the formula C₉H₂₀, a colorless, flammable liquid in the gasoline and kerosene fraction of crude oil.
Nonantum Capital Partners
Nonantum Capital Partners is a Boston-based private equity firm, founded in 2018 as a spin-out from Charlesbank, investing in lower middle market companies in North America.
Nonbenzodiazepine
Nonbenzodiazepines (Z-drugs): zolpidem, zaleplon, eszopiclone, zopiclone; sedative-hypnotics acting at the GABA-A benzodiazepine site for insomnia, with alpha-1 selectivity, 2019 FDA boxed warning for complex sleep behaviors, and less dependence risk than benzodiazepines.
Noncanonical and moonlighting functions of aminoacyl-tRNA synthetases
Several aminoacyl-tRNA synthetases (aaRSs) carry out moonlighting, non-translational jobs as cytokines, transcriptional regulators, signaling components, and structural scaffolds, often activated by proteolysis, alternative splicing, or alternative polyadenylation.
Noncardiac influences on heart rate
Noncardiac influences on heart rate are systemic and environmental factors, including body temperature, sleep, posture, altitude, emotion, and caffeine, that change heart rate without any fault in the heart itself.
Nonce word
Nonce word: a word coined for a single occasion, also called occasionalism. Term from the 1884 OED; distinct from neologism and hapax legomenon; examples include chortle and mob.
Noncentrosymmetric superconductivity
Noncentrosymmetric superconductivity is superconductivity in a crystal that lacks inversion symmetry, allowing antisymmetric spin-orbit coupling to mix spin-singlet and spin-triplet pairing, as studied in the heavy-fermion compound CeRh2As2.
Noncircular gear
A noncircular gear is a gear whose pitch curve is not a circle, so its transmission ratio varies continuously within each revolution; common shapes include ellipses and ovals.
Nonclassical light
Nonclassical light is light whose quantum state cannot be described as a mixture of classical electromagnetic waves, including squeezed states, antibunched light, and single photons.
Noncollocated control
Noncollocated control is a control arrangement for flexible structures and robots in which the actuator and sensor sit at different locations, sacrificing easy stability for better tip performance.
Noncommutative geometry
Noncommutative geometry, developed principally by Alain Connes, extends geometry, topology, and calculus to spaces described by noncommuting algebras, with the spectral triple as its central object.
Noncommutative geometry in string theory
Noncommutative geometry in string theory is the appearance of noncommuting spacetime coordinates in open-string gauge theories on D-branes in a background B-field, established by Seiberg and Witten in 1999.
Noncommutative integration
Noncommutative integration is a branch of operator algebra theory extending measure and integration theory to von Neumann algebras, reducing to classical integration when the algebra is abelian.
Noncommutative Moyal spacetime
Noncommutative Moyal spacetime, also called canonical noncommutative spacetime or the Moyal plane, is a spacetime model whose coordinates obey constant commutation relations, handled by the Moyal star product.
Noncompaction cardiomyopathy
Noncompaction cardiomyopathy (left ventricular noncompaction, LVNC, hypertrabeculation) is a spongy-myocardium condition with prominent trabeculae and deep recesses; diagnosed by NC/C ratios on echo or CMR, genetically overlapping other cardiomyopathies, with outcomes similar to dilated cardiomyopathy.
Noncompliant
Noncompliant, also known as Lisa Smith, is an American techno DJ and producer from Indiana, formerly DJ Shiva, who founded the label Giant Arm in 2023.
Nonconservative force
A nonconservative force is a force whose work between two points depends on the path taken, like friction, so no potential energy can be defined for it.