All articles starting with S
44,216 articles
Sierras Blancas Oil and Gas Field
Sierras Blancas is a shale oil and gas field in the Vaca Muerta formation of the Neuquén Basin, western Argentina, operated by Shell, which moved it into development in 2018.
Siesbach
Siesbach is a Hunsrück village in Birkenfeld county, Rhineland-Palatinate, first recorded in 1284. It is known for the Gallo-Roman burial mound "Kipp" (167–175 AD) and the early Celtic princely grave "Ameis".
Siese
Siese, also called Saaset, was a high official of Egypt's 12th Dynasty who served as high steward and later held the offices of treasurer and vizier at the same time, probably under Senusret III.
Siesta
Siesta: an early-afternoon nap, from Latin sexta (hora), sixth hour. Traditional in Spain, Mediterranean, and Latin America; short naps of 20-30 minutes aid alertness, while habitual naps over 60 minutes correlate with higher cardiometabolic and mortality risks.
Siesta Key (TV series)
Siesta Key is an MTV reality series that premiered July 31, 2017, following young adults in Sarasota County, Florida. Made by Laguna Beach's producers, it uses a cinematic, confessional-free format and drew recurring accusations of being staged.
Siesta Key, Florida
Siesta Key, Florida: an 8-mile barrier island off Sarasota on the Gulf coast, famed for 99% quartz sand that stays cool, Siesta Beach's 950-space free lot, lifeguards, and top rankings including No. 28 on the 2026 World's 50 Best Beaches list.
Sieve
A sieve, or mesh strainer, is a device with a perforated or woven-wire screening surface of controlled opening size, used to separate granular particles by size or measure particle-size distribution.
Sieve analysis
Sieve analysis, also called a gradation test or screen analysis, is a laboratory method that determines a material's particle size distribution by passing it through stacked sieves.
Sieve methods (combinatorics)
Sieve methods are combinatorial counting techniques, rooted in the inclusion–exclusion principle, that strike out unwanted objects to control the explosion of terms, from Eratosthenes to Brun.
Sieve of Atkin
The Sieve of Atkin, or Atkin sieve, is an algorithm by Atkin and Bernstein, introduced in 2004, that generates all primes up to N in sublinear time.
Sieve of Eratosthenes
The Sieve of Eratosthenes is an ancient algorithm for finding all primes up to a limit by crossing out multiples, attributed to Eratosthenes of Cyrene around 200 BC.
Sievering
Sievering is a suburban quarter of Vienna's 19th district, Döbling, formed from the former wine-growing villages of Obersievering and Untersievering, first recorded as Sufringen in 1114 and part of Vienna since 1890/92.
Sievert
The sievert (Sv) is the SI derived unit of dose equivalent, weighting absorbed ionizing radiation for biological harm, adopted in 1979 and named for Swedish physicist Rolf Sievert.
Siewert J. Marrink
Siewert J. Marrink, also known as Siewert-Jan Marrink, is a Dutch physical chemist and professor of Molecular Dynamics at the University of Groningen, developer of the Martini coarse-grained force field.
Sif
Sif (Old Norse Sif) is the Norse goddess wife of Thor, mother of Ullr and Thrud, famous for her golden hair cut by Loki and replaced with dwarf-forged gold, the origin of Mjolnir and the gods' treasures.
Sif Mons
Sif Mons: large shield volcano on Venus in western Eistla Regio (22°N, 352.4°E), IAU-named 1982 for Thor's wife; subject of a disputed 2024 Magellan radar claim of ongoing eruption.
Sifaka
Sifaka (Propithecus), Malagasy sifaka or tsibahaka, a genus of nine Critically Endangered diurnal lemurs endemic to Madagascar, known for vertical clinging and leaping, folivorous seed-predation, and the hiss-like 'shee-faak' call that gives them their name.
Sifan Hassan
Sifan Hassan, Dutch distance runner born 1993 in Nazreth, Ethiopia; Olympic gold at 5000m, 10,000m (Tokyo 2020) and marathon (Paris 2024, 2:22:55 OR); 2019 Doha 1500m/10,000m world double; 2024 World Athlete of the Year.
Sifangcheng site
Sifangcheng site (四方城遗址), a Warring States to Song walled city on the You River in Baojing, Hunan; identified as Han Qianling county town, a 2013 national heritage site with tombs, grain cellar, and bronze workshop.
Şifanur Gül
Şifanur Gül (born 1997, Ankara) is a Turkish actress trained at Ankara University State Theater, known for Esvet in Netflix's Terzi, Eylül in Sevdim Seni Bir Kere, and GQ Türkiye 2023 Rising Star Actress award.
sifap1 study
The sifap1 study (Stroke in Young Fabry Patients) was a European observational cohort study of 5,023 stroke patients aged 18 to 55 that found definite Fabry disease in 0.5%.
Sifarchaeota
"Candidatus Sifarchaeota", also called "Candidatus Sifarchaeia", is a candidate Asgard archaeal lineage proposed in 2021 from Costa Rica margin sediment, known only from genome sequences.
Sifflet
Sifflet is a Paris-based data observability SaaS platform founded in 2021 by Salma Bakouk and the Fathallah brothers, offering data quality monitoring, lineage, catalog, and AI agents; backed by EQT Ventures and Mangrove.
Sifi Ghrieb (سفي غريب)
Sifi Ghrieb (سفي غريب), born 1971 in Tébessa, is an Algerian technocrat and Prime Minister since 2025, first interim from 28 August, confirmed 14 September 2025, after leading Algeria's state steel industry and serving as Minister of Industry.
SiFive
SiFive is an American fabless semiconductor IP company founded in 2015 by RISC-V's inventors, licensing customizable RISC-V processor cores rather than selling chips, with IP in over 2 billion devices.
SIFSIX metal–organic frameworks
SIFSIX metal–organic frameworks are anion-pillared ultramicroporous materials built from metal ions, nitrogen-donor linkers, and SiF₆²⁻ pillars, best known for capturing trace CO₂ and separating acetylene from ethylene.
SIFSIX MOFs for carbon capture
SIFSIX MOFs are a family of anion-pillared metal–organic frameworks built around the hexafluorosilicate anion, whose fluorine-lined pores bind carbon dioxide with high selectivity for carbon capture.
Sifu (video game)
Sifu is a 2022 kung fu beat-'em-up by Paris studio Sloclap; deaths age the protagonist (starting at 20, fatal past 70), built on motion-captured Pak Mei kung fu, selling over 4 million copies with a Netflix film in development.
SIG (robot)
SIG, pronounced "shigu," was a humanoid robot developed in Japan around 2000 by the Kitano Symbiotic Systems Project, known for its active audition system that integrated hearing, vision, and movement.
Sig Hansen
Sig Hansen, full name Sigurd Jonny Hansen, is an American fishing captain of the crab vessel F/V Northwestern and a lead captain on Deadliest Catch since 2005.