All articles starting with E
17,681 articles
Exsolution in perovskite catalysts
Exsolution in perovskite catalysts is the in situ growth of metal nanoparticles on a perovskite oxide surface, where socketed particles resist agglomeration, coking, and poisoning in fuel cells and electrolysers.
Exstrophy-epispadias complex
Exstrophy-epispadias complex (EEC, BEEC), also called bladder exstrophy-epispadias complex: rare congenital malformation spectrum from epispadias to classic bladder exstrophy and cloacal exstrophy (OEIS), incidence about 1/30,000, treated by staged or primary surgical repair.
Exsufflation
Exsufflation is an airway-clearance technique in which a device applies negative pressure to the airway to simulate a cough and mobilize mucus, used mainly in neuromuscular disease.
Ext functor
The Ext functor, or Ext group, is a family of functors in homological algebra defined as the right derived functors of the Hom functor, named for extensions.
Ext2
Ext2, also called second extended file system or Ext2fs, is a Linux filesystem released in January 1993 by Rémy Card, Theodore Ts'o, and Stephen Tweedie, once the predominant Linux filesystem.
EXT2 (gene)
EXT2 (exostosin glycosyltransferase 2, HGNC:3513) is a human gene at 11p11.2 encoding exostosin-2, which with EXT1 forms the Golgi heparan sulfate co-polymerase; heterozygous variants cause multiple exostoses type 2, biallelic variants cause AREXT2 syndrome.
Ext3
Ext3, or the third extended filesystem, is a journaling filesystem for Linux released in 1999 by Stephen Tweedie as ext2 plus a journal, and long the default in most distributions.
Ext4
Ext4, also called the fourth extended file system, is the journaling Linux file system evolved from ext3, which records file data in extents and supports files up to 16 TiB.
Extant (TV series)
Extant is an American CBS science fiction mystery thriller (2014–2015, two seasons, 26 episodes) created by Mickey Fisher and executive produced by Steven Spielberg, starring Halle Berry as astronaut Molly Woods, who returns from a 13-month solo space mission inexplicably pregnant to a family including an android son, Ethan.
Exte (エクステ)
Exte (エクステ, Exte: Hair Extensions) is a 2007 Japanese horror film directed by Sion Sono, starring Chiaki Kuriyama and Ren Osugi, about cursed hair extensions made from a murdered girl's hair, released by Toei on February 17, 2007.
Extempo
Extempo, also called extempo war or calypso war, is an improvised form of calypso performed mainly in Trinidad, Tobago, and Grenada, where singers trade witty verses on a drawn topic.
Extemporaneous speaking
Extemporaneous speaking (Extemp, USX/IX) is a limited-prep forensics event: draw three current-events questions, 30 minutes of prep, a 7-minute speech from memory or minimal notes, judged on analysis, evidence, and delivery.
Extend (company)
Extend is an American insurtech company in San Francisco that lets online retailers attach extended warranty plans to products at checkout through an API, raising $260 million in 2021.
Extended aeration
Extended aeration is a low-rate modification of the activated sludge wastewater treatment process with long aeration times, most commonly built as oxidation ditches or package plants serving small communities.
Extended ASCII
Extended ASCII (EASCII) is a loose term for 8-bit encodings that add accented letters, currency symbols, and graphics above 7-bit ASCII, in incompatible families like ISO 8859 and Windows code pages.
Extended attributes
Extended attributes, abbreviated xattrs, are name:value pairs that filesystems store with files and directories to hold metadata such as access control lists and security labels.
Extended Backus–Naur form
Extended Backus–Naur form (EBNF) is a BNF-derived notation for specifying syntax, standardized as ISO/IEC 14977:1996. Based on Niklaus Wirth's 1977 proposal, it adds repetition { }, optionality [ ], grouping, and quoted terminals, and underlies grammars such as XML 1.0.
Extended Chandra Deep Field South
The Extended Chandra Deep Field-South (E-CDF-S) is a Chandra X-ray survey of about 0.3 square degrees flanking the original Chandra Deep Field-South, made with four deep pointings.
Extended Display Identification Data
Extended Display Identification Data (EDID) is a VESA metadata format, introduced in 1994, that a display uses to tell a video source its manufacturer, timings, and capabilities.
Extended Euclidean algorithm
The extended Euclidean algorithm, also called extended GCD, computes the greatest common divisor of two integers plus Bézout coefficients, and is used to find modular inverses in cryptography.
Extended evolutionary synthesis
The extended evolutionary synthesis (EES) is a proposed framework for evolutionary biology that would add development, non-genetic inheritance, and niche construction to the modern synthesis.
Extended family
Extended family: kin beyond the nuclear family (grandparents, aunts, uncles, cousins), also called multigenerational households when three or more generations co-reside. Distinguished from nuclear families by vertical and lateral extension, census definitions, and prevalence in the US and Canada.
Extended Family (TV series)
Extended Family is an NBC multi-camera sitcom (2023–2024, one season, 13 episodes) starring Jon Cryer, Abigail Spencer, and Donald Faison as divorced co-parents sharing the family home, inspired by Celtics owner Wyc Grousbeck's life; canceled after one season.
Extended finite element method
The extended finite element method (XFEM) is a numerical technique of computational mechanics, reported by Moës, Dolbow, and Belytschko in 1999, that models cracks and interfaces without remeshing.
Extended Graphics Array
Extended Graphics Array, or XGA, is an IBM graphics standard introduced in 1990 for the PS/2, combining VGA compatibility with 1024 × 768 resolution and 256 colors.
Extended Groth Strip
The Extended Groth Strip is a narrow strip of sky in Ursa Major containing at least 50,000 galaxies, one of the most intensively studied extragalactic fields.
Extended Hubbard model
The extended Hubbard model, often called the U-V model at low density, adds intersite Coulomb repulsion between neighboring sites to the standard Hubbard model, stabilizing charge-ordered states.
Extended Industry Standard Architecture
Extended Industry Standard Architecture (EISA) is a 32-bit PC expansion bus announced in 1988 by nine computer makers as an open alternative to IBM's Micro Channel Architecture.
Extended information filter
The extended information filter (EIF) is a Gaussian state-estimation algorithm, the information-form dual of the extended Kalman filter, whose sparse representation made scalable SLAM possible.
Extended Jacobian method
The extended Jacobian method is a technique for resolving kinematic redundancy of robot manipulators, proposed by John Baillieul, that adds secondary-task constraints so the velocity mapping becomes square and invertible.