All articles starting with S
44,216 articles
Semiparametric regression
Semiparametric regression is regression in which part of the model is specified by a finite number of parameters and part is left as an unknown function.
Semipermeable membrane
A semipermeable membrane, also called a selectively permeable membrane, is a barrier that lets some molecules or ions pass while blocking others, underlying osmosis, dialysis, and reverse osmosis.
Semiprime
A semiprime, also called a 2-almost prime or biprime, is a natural number that is the product of exactly two primes, like 15 = 3 × 5.
Semiramis
Semiramis, or Sammuramat, is a legendary queen of Assyria and builder of Babylon in Greek legend, loosely attached to the historical Assyrian queen Sammuramat of the 9th century BCE.
Semiramis Pekkan
Semiramis Pekkan (born 1948) is a Turkish pop singer and actress, the younger sister of Ajda Pekkan, who recorded from 1968 to 1975 and returned in 2024 with 'Unutamadım'.
Semiramus Corona
Semiramus Corona is a 375-km-diameter corona, a circular volcano-tectonic structure, on Venus at 37°S, 293°E in Themis Regio; IAU-named in 1997 for an Assyrian fertility goddess, with mapped lava-flow units fSe1 and fSe2.
Semirara Mining and Power
Semirara Mining and Power Corporation is a Philippine company that mines coal on Semirara Island, Antique, and generates power from it, producing most of the country's coal.
Semirechye Cossack Host
The Semirechye Cossack Host (Семиреченское казачье войско) was a Cossack host of the Russian Empire, formed in 1867 and stationed in Semirechye, with its center at Verny.
Semiregular variable star
A semiregular variable star is a pulsating red giant or red supergiant whose light changes with noticeable but imperfect periodicity, over periods of roughly 20 to 500 days.
Semiring
A semiring is an algebraic structure with addition and multiplication in which multiplication distributes over addition, but subtraction is not required; the natural numbers are the basic example.
Semisimple module
A semisimple module, also called a completely reducible module, is a module that is a direct sum of simple submodules; it underlies the representation theory of finite groups.
Semisonic
Semisonic is an American rock trio formed in Minneapolis in 1993 by Dan Wilson, John Munson, and Jacob Slichter, best known for the chart-topping 1998 single "Closing Time."
Semistochastic heat-bath configuration interaction
Semistochastic heat-bath configuration interaction (SHCI) is a quantum chemistry method, introduced in 2016 and extended in 2017, that computes nearly exact energies for strongly correlated molecules like the chromium dimer.
Semistructured interview
A semistructured interview is a qualitative research method in which the interviewer asks open-ended questions from a flexible predetermined guide, between structured and unstructured interviews.
SemiSWEET transporter
SemiSWEET transporters are small bacterial and archaeal sugar transporters, prokaryotic homologs of eukaryotic SWEETs, with only three transmembrane helices per protomer functioning as parallel dimers.
Semisynthesis
Semisynthesis is a synthesis strategy that prepares molecules by chemically modifying natural compounds, supplying the core skeleton and most stereocenters from nature; it underlies many drugs, including paclitaxel and semisynthetic antibiotics.
Semitic languages
Semitic languages: an Afroasiatic branch including Akkadian, Arabic, Hebrew, Aramaic, and Amharic, documented since 2500 BC, descended from reconstructed Proto-Semitic, with debated internal subgrouping.
Semitic people
Semitic people: conventional label for speakers of Semitic languages (Arabic, Hebrew, Aramaic, Amharic, Akkadian and others), coined by Schlözer in 1781 from the biblical Shem. It is a linguistic, not ethnic or racial, classification.
Semitone
A semitone, also called a half step, is the smallest interval in the Western chromatic scale, the distance between adjacent piano keys; twelve make an octave.
Semitronix (Semi-Tech Group) (赛美特)
Semitronix, also known as Semi-Tech Group (赛美特), is a Shanghai-based developer of semiconductor CIM software for wafer fabs, formed in 2021, with investors including Huawei's Hubble and BYD.
Semivowel
Semivowel, also known as a glide or semi-consonant, is a speech sound that functions as a consonant, is a glide, and cannot form the nucleus of a syllable.
Semla
Semla (plural semlor, also fettisdagsbulle or fastlagsbulle): Swedish cardamom wheat bun filled with almond paste and whipped cream, eaten around Shrove Tuesday; origin a medieval Lenten bread, cream form from the late 19th century.
Semmering Base Tunnel
The Semmering Base Tunnel (German: Semmering-Basistunnel) is a 27.3 km twin-tube railway tunnel under construction between Gloggnitz and Mürzzuschlag, Austria, with final breakthrough in 2024 and opening planned for 2029.
Semmering Railway
Semmering Railway (Semmeringbahn), Austrian 41 km mountain railway built 1848-1854 by Carl von Ghega, the world's first major mountain railway; UNESCO World Heritage site since 1998 with 14 tunnels and 16 viaducts.
Semmy Schilt
Semmy Schilt, Dutch kickboxer and MMA fighter born 1973, four-time K-1 World Grand Prix champion (2005-2009) and 2012 Glory Grand Slam winner; 2.12 m tall, jab and front kick style.
Semna Dispatches
The Semna Dispatches, also spelled Semna Despatches, are hieratic administrative papyri reporting patrols and communications between Egyptian fortresses at the Second Cataract in Nubia under Amenemhet III.
Semna fortifications
The Semna fortifications are Middle Kingdom Egyptian fortresses at Semna and Kumma, at the Second Cataract of the Nile, built under Senusret III to fix Egypt's southern border with Kush.
Semna stelae of Senusret III
The Semna stelae, or Semna boundary stelae, are two boundary stelae of the Egyptian king Senusret III, erected at Semna in Lower Nubia in his regnal years 8 and 16.
Semna temple of Dedwen
The Semna temple of Dedwen is a New Kingdom Egyptian temple at the fortress of Semna in Sudan, dedicated to the Nubian god Dedwen and Senusret III.
Semnan Space Center
Semnan Space Center, known as the Imam Khomeini Spaceport, is Iran's first permanent satellite launch site in Semnan province, launching Safir, Simorgh, and Zuljanah rockets.