All articles starting with S
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Schlieffen Plan
Schlieffen Plan: December 1905 memorandum by Count Alfred von Schlieffen, German chief of staff 1891–1905, traditionally Germany's two-front war plan via Belgium; its existence and status are contested since Terence Zuber's 1999 revisionist thesis.
Schlieren photography
Schlieren photography is an optical imaging technique that makes refractive-index gradients in transparent media visible as brightness variations, revealing flows and inhomogeneities otherwise invisible to the eye.
Schlitterbahn
Schlitterbahn Waterparks and Resorts: family-founded Texas waterpark chain (New Braunfels, opened 1979 by Bob and Billye Henry); pioneered Master Blaster uphill coaster, Transportainment rivers; parks later acquired by Cedar Fair and Six Flags.
Schlitzie
Schlitzie (Simon Metz, legally Schlitze Surtees), 1901-1971, American microcephalic sideshow performer with Barnum & Bailey and Dreamland, best known for two scenes in Tod Browning's Freaks (1932).
Schloenbachia
Schloenbachia is an extinct genus of Cenomanian ammonites (family Schloenbachiidae, type species Ammonites varians Sowerby 1817), a highly variable Boreal ammonite dominant in northern Cretaceous seas, revised to three species: varians, coupei, lymensis.
Schlossau
Schlossau is a village in the municipality of Mudau in the Odenwald region of Baden-Württemberg, Germany, best known for the Roman fort that stood there on the Odenwaldlimes.
Schlotheimia
Schlotheimia (Bayle, 1878) is an extinct Early Jurassic ammonite genus, family Schlotheimiidae, type species Ammonites angulatus Schlotheim, 1820 (ICZN Opinion 323); evolute, ribbed Hettangian index fossils, distinct from the moss genus of the same name.
Schlumberger
Schlumberger, known since 2022 as SLB, is a global energy technology company founded in 1926 by Conrad and Marcel Schlumberger that pioneered electrical well logging.
Schlumberger array
The Schlumberger array is a four-electrode configuration for measuring the electrical resistivity of the ground, with closely spaced potential electrodes, and the most common configuration for vertical electrical sounding.
Schlumberger brothers
Conrad and Marcel Schlumberger were French geophysicists from Alsace who founded electrical well logging, recording the first resistivity well log at Pechelbronn, France, in 1927.
Schlumbergera
Schlumbergera, the holiday or Christmas cactus genus (formerly Zygocactus), is a group of seven epiphytic cactus species native to southeastern Brazil, named by Lemaire in 1858 for Frédéric Schlumberger; its hybrids bloom in winter after 12–14 hour nights.
Schlüter (lunar crater)
Schlüter is an 87.55-km Imbrian-age impact crater on the Moon's western limb at 5.93°S, 83.39°W, northeast of the Orientale basin, IAU-named in 1964 for German astronomer Heinrich Schlüter, with pyroclastic floor deposits and seven lettered satellite craters.
Schmallenberg disease
Schmallenberg disease, caused by Schmallenberg virus (SBV), a Simbu serogroup Orthobunyavirus, emerged in Europe in 2011; Culicoides-borne, it causes fever and milk drop in cattle and congenital malformations in ruminant offspring.
Schmallenberg orthobunyavirus
Schmallenberg orthobunyavirus (SBV), a Simbu serogroup Orthobunyavirus first detected in Germany in November 2011, is spread by Culicoides midges, causes fever and milk loss in adult ruminants and congenital malformations in offspring, and is not transmitted to humans.
Schmaltz
Schmaltz (שמאַלץ, shmalts) is rendered poultry fat, chiefly chicken, goose, or duck, the traditional cooking fat of Ashkenazi Jewish cuisine, created because lard is not kosher and butter cannot accompany meat meals.
Schmalz (company)
Schmalz (J. Schmalz GmbH) is a German family-owned manufacturer of vacuum technology based in Glatten in the Black Forest, founded in 1910 as a razor blade factory.
Schmertmann method
The Schmertmann method is a semi-empirical procedure for estimating settlement of shallow foundations on sand using cone penetration test data, introduced by John H. Schmertmann in 1970.
Schmid factor
The Schmid factor is a dimensionless geometric factor giving the fraction of uniaxial stress resolved as shear on a crystal's slip plane, which governs when slip begins.
Schmidl & Cox synchronization algorithm
The Schmidl & Cox synchronization algorithm is a 1997 preamble-based method for OFDM receivers that finds frame timing and corrects the carrier frequency offset using two training symbols.
Schmidt (Martian crater)
Schmidt is a 201.35 km impact crater on Mars at 72.07S, 282.10E in the southern highlands, IAU-approved in 1973 and named for German astronomer Johann F. Schmidt and Russian geophysicist Otto Y. Schmidt; distinct from the 11 km lunar crater Schmidt.
Schmidt camera
A Schmidt camera is a catadioptric optical system with a spherical mirror and corrector plate, invented by Bernhard Schmidt in 1930 for wide-field sky photography.
Schmidt coupling
A Schmidt coupling is a mechanical shaft coupling that keeps two radially offset parallel shafts turning in exact 1:1 synchronism, even while the offset changes under load.
Schmidt decomposition
The Schmidt decomposition is a theorem of quantum information theory stating that any bipartite pure state can be written with paired orthonormal bases and real, non-negative coefficients.
Schmidt number
The Schmidt number (Sc) is a dimensionless number defined as the ratio of momentum diffusivity to mass diffusivity, named after German scientist Ernst Schmidt and used in mass transfer analysis.
Schmidt reaction
The Schmidt reaction is an acid-promoted reaction of hydrazoic acid with ketones, aldehydes, and carboxylic acids that inserts nitrogen, reported by Karl Friedrich Schmidt in 1924.
Schmidt sting pain index
Schmidt sting pain index: Justin O. Schmidt's 0-to-4 scale rating Hymenoptera sting pain, honey bee at 2, bullet ant and tarantula hawk at 4, described in The Sting of the Wild (2016).
Schmier
Schmier is the German-spelled name for Smear, an All Fours family trick-taking card game of Minnesota, Wisconsin, and Ontario, related to Pitch and Setback, with six-point hands, bower jacks, and bidding.
Schmigadoon!
Schmigadoon! is an Apple TV+ musical comedy series created by Cinco Paul and Ken Daurio, starring Cecily Strong and Keegan-Michael Key as a couple trapped in a Golden Age musical town; canceled in 2024, its stage adaptation won the 2026 Tony for Best Musical.
Schmigadoon! (musical)
Schmigadoon! is a 2026 Broadway musical with book, music, and lyrics by Cinco Paul, adapted from the Apple TV+ series; it won the 2026 Tony for Best Musical at the Nederlander Theatre.
Schmitt trigger
A Schmitt trigger (Shmidt trigger) is an electronic circuit that switches at two thresholds, so its hysteresis converts noisy, slowly changing signals into sharp logic edges.