All articles starting with S
44,216 articles
Small-signal model
A small-signal model is a linear approximation of a nonlinear circuit or device, valid for small signals and used in amplifier, RF, and control design.
Small-signal stability
Small-signal stability is the ability of a power system to maintain synchronism under small disturbances like load changes, analyzed by linearizing the system around an operating point.
Small-world experiment
Milgram's small-world experiment: chain-letter study measuring acquaintance paths to a Boston stockbroker; 64 of 296 chains completed, median 5.2 intermediaries; basis of six degrees of separation, critiqued by Kleinfeld and replicated by Dodds, Muhamad, and Watts.
Small-world network
A small-world network, also called a small-world graph, is a network with dense local clustering and short average path lengths, named by Watts and Strogatz in a 1998 Nature paper.
Small, acid-soluble spore protein I
Small, acid-soluble spore protein I (SspI, sspI gene) is a minor SASP of Bacillus subtilis spores, forespore-specific, sigma-G transcribed, and the only apparently universal SASP across Bacillus species.
Small/Large delta antigen
Small and large delta antigens (HDAg-S, HDAg-L), the two isoforms of the sole protein of hepatitis D virus; the 24 kDa small form drives RNA replication, the 27 kDa large form, made by ADAR1 RNA editing, inhibits replication and enables assembly with HBsAg.
SmallAnt
SmallAnt (Tanner Ant), Canadian speedrunner and YouTuber known for Super Mario Odyssey, Pokémon, and Minecraft challenge content; former Panda member, Minimum Captures record holder, about 3.26 million YouTube followers.
Smallanthus
Smallanthus is a genus of about 20-23 tuberous-rooted Asteraceae (Millerieae, Espeletiinae) from the USA to Argentina, named by Mackenzie in 1933; its best-known species is yacon, Smallanthus sonchifolius.
Smallcase
Smallcase, rebranded CASE Platforms in 2026, is a Bengaluru-based Indian investment-technology startup founded in 2015 whose core product is curated model portfolios of stocks and ETFs bought through partner brokers.
Smaller Mound
Smaller Mound (N-UP-A73) is an ASI-protected archaeological mound at Bajera Khera, Aligarh district, Uttar Pradesh, measuring 112' x 107', companion to the larger Khera Mound, with Painted Grey Ware found at the site.
Smaller Mound Bearing Five Large Digamber Jain Figures Which People Call the Five Pandavas
Smaller mound bearing five large Digamber Jain figures, called the five Pandavas: ASI centrally protected monument no. 3137 at Asothar, Fatehpur district, Uttar Pradesh; 10th-century headless sandstone Jain Tirthankara images under ASI Lucknow Circle.
Smallest organisms
Smallest organisms: mycoplasmas (Mollicutes), wall-less bacteria 300–400 nm with the smallest self-replicating genome, Mycoplasma genitalium at 580,076 bp; also viruses (20–300 nm, not free-living), Carsonella ruddii (159,662 bp endosymbiont), and disputed nanobacteria.
Smalley Steel Ring Company
Smalley Steel Ring Company is an American manufacturer of retaining rings, wave springs, and constant section rings, founded in 1918 and headquartered in Lake Zurich, Illinois.
Smallfolk
Smallfolk: in-universe term for the common people of Westeros in Game of Thrones and House of the Dragon, and the title of House of the Dragon season 2 episode 6 (2024), written by Eileen Shim, in which King's Landing riots and Seasmoke claims Addam of Hull.
Smallfoot
Smallfoot is a 2018 American computer-animated musical comedy from Warner Animation Group in which a young yeti named Migo discovers a human, reversing the Bigfoot legend.
Smallmouth bass
Smallmouth bass (Micropterus dolomieu), bronzeback, a North American centrarchid game fish native to the Great Lakes and Mississippi basins, introduced worldwide; male nest-guarding spawner preferring 17-28°C waters, invasive where introduced.
Smallpox
Smallpox, caused by the variola virus, was a contagious disease marked by fever and rash, killing about 1 in 3 infected people until eradication in 1980.
Smallpox and monkeypox vaccine, live, non replicating
JYNNEOS (Smallpox and Monkeypox Vaccine, Live, Non-replicating; Imvamune, Imvanex) is Bavarian Nordic's two-dose MVA-BN vaccine, FDA-licensed 2019, safer than ACAM2000, used in the 2022 mpox outbreak.
Smallpox and mpox vaccine, live
Smallpox and mpox vaccine, live (ACAM2000), a live replication-competent vaccinia (NYCBOH/Dryvax-derived) vaccine grown in Vero cells, given once by bifurcated-needle scarification; FDA-licensed 2007, mpox indication 2024, boxed warning for myopericarditis.
Smallpox epidemic in Peru, 1520s–1546
The smallpox epidemic in Peru (Viruela en el Perú) was an outbreak that reached the Inca Empire around 1524–1527, killing emperor Huayna Capac and his heir Ninan Cuyochi.
Smallpox epidemic of 1520 in Mexico
The smallpox epidemic of 1520 in Mexico (Viruela de 1520) was the first smallpox epidemic in central Mexico, killing an estimated 5 to 8 million people.
Smallpox epidemic of Tenpyō era
The smallpox epidemic of Tenpyō era (天平の疫病) was a smallpox outbreak that struck Japan in 735 to 737, under Emperor Shōmu, killing an estimated one third of the population.
Smallpox epidemics in Brazil
Smallpox epidemics in Brazil, known in Portuguese as varíola, or bexigas, were recurrent outbreaks from the 1560s until eradication in 1973, shaping the country's public health institutions.
Smallpox eradication in West Africa
Smallpox eradication in West Africa was a 1966 CDC and WHO campaign across 20 countries of West and Central Africa that ended smallpox transmission there by May 1970.
Smallpox vaccine
Smallpox vaccine: vaccinia-based vaccine created by Edward Jenner in 1796, the first successful vaccine; 95% effective historically, it enabled WHO's 1980 eradication of smallpox and now exists as stockpiled ACAM2000, JYNNEOS, and APSV.
Smallpox virus retention debate
The smallpox virus retention debate is the international dispute over destroying or keeping the last variola virus stocks held in the United States and Russia.
Smalls Lighthouse
Smalls Lighthouse is an active Trinity House lighthouse standing on the Smalls rocks in the Irish Sea about 21 miles west of St David's Head, Pembrokeshire, Wales.
Smalltalk
Smalltalk is a family of purely object-oriented programming languages created at Xerox PARC between 1970 and 1980, known for message passing and live image-based programming.
Smalltown Boy
Smalltown Boy is the 1984 debut single by British synth-pop band Bronski Beat, written by Bronski, Somerville, and Steinbachek. It reached No 3 in the UK and No 1 on the US dance chart, telling a young gay man's escape from homophobia.
Smallville
Smallville (2001-2011) is the WB/CW Superman origin drama by Alfred Gough and Miles Millar, starring Tom Welling as young Clark Kent under the "no tights, no flights" rule; 218 episodes, longest-running superhero TV series.