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Segregation engineering
Segregation engineering (also called grain boundary segregation engineering) is a materials design strategy using deliberate solute decoration of grain boundaries, formulated for metallic alloys by Dierk Raabe and colleagues in 2014.
Segula Technologies
Segula Technologies is a French industrial engineering group providing design, industrialization, and production services to sectors including automotive, aerospace, energy, and rail, employing 15,000 people across more than 30 countries.
Segway
The Segway, also called the Segway Personal Transporter, is a two-wheeled, self-balancing electric personal transporter invented by Dean Kamen, unveiled in December 2001 and discontinued in 2020.
Segway RMP
The Segway RMP is a family of robotic chassis derived from the Segway Human Transporter, sold to research and defense customers as a powered base for building robots.
Sehit Aybuke Yalcin Oil Field
Sehit Aybuke Yalcin (Şehit Aybüke Yalçın) is an onshore oil field in Şırnak province, southeastern Türkiye, discovered by TPAO in 2023 with an estimated 1 billion barrels in place.
Sehit Esma Cevik Oil Field
Sehit Esma Cevik Oil Field (Şehit Esma Çevik Sahası) is an onshore oil field on Gabar Mountain in Şırnak, southeastern Türkiye, discovered by Turkish Petroleum (TPAO) in 2021.
Sei Kwang Hahn
Sei Kwang Hahn (한세광) is a South Korean biomaterials researcher, chair professor at POSTECH, known for hyaluronic acid nanomedicines and smart contact lenses, and founder of PHI BIOMED.
Seiemon Inaba
Seiemon Inaba, also romanized Seiuemon Inaba, was a Japanese engineer and industrialist who founded FANUC, maker of numerical controls and factory robots, and led Japan's first NC device in 1956.
Seikan Tunnel (青函トンネル)
The Seikan Tunnel (青函トンネル) is a 53.85 km railway tunnel crossing the Tsugaru Strait to connect Japan's islands of Honshu and Hokkaido, opened in March 1988.
Seiko (セイコー)
Seiko (セイコー) is a Japanese watch brand introduced in 1924 by the company Kintaro Hattori founded in 1881, which launched the world's first quartz wristwatch, the Astron, in 1969.
Seismic analysis
Seismic analysis is the structural engineering practice of computing how a building responds to earthquake ground motion, using methods such as equivalent lateral force and response spectrum analysis.
Seismic isolation bearing
A seismic isolation bearing is a device between foundation and superstructure that allows relative motion during earthquakes while dissipating energy, lengthening the vibration period to reduce seismic forces.
Seismic jacketing
Seismic jacketing is an earthquake retrofit technique that encases deficient reinforced concrete columns in concrete, steel, or fiber-reinforced polymer jackets, changing brittle failure modes to ductile ones.
Seismic metamaterials
Seismic metamaterials are engineered periodic structures built in soil or at building bases that block or redirect seismic waves, demonstrated at full scale near Grenoble in 2012.
Seismic qualification testing
Seismic qualification testing is the experimental demonstration, typically on a shake table, that equipment can perform its function during and after earthquake loading; it is the most reliable qualification route.
Seismic retrofit
A seismic retrofit, also called seismic retrofitting or an earthquake retrofit, improves an existing building's resistance to seismic loads through interventions designed after evaluation of its structure.
Seismic testing
Seismic testing subjects structures and equipment to simulated earthquake ground motions, most often on a shake table, to measure dynamic response and vulnerability for qualification and research.
Sejong the Great-class destroyer
The Sejong the Great class (세종대왕급 구축함), also KDX-III, is a class of Aegis guided-missile destroyers of the Republic of Korea Navy, first commissioned in 2008.
Sel-Sync
Sel-Sync (Selective Synchronous recording) is an Ampex tape recording technique from the mid-1950s in which the record head doubles as a playback head, enabling synchronized overdubs.
SeL4
seL4 is an open source, capability-based microkernel of the L4 family, first proven functionally correct in 2009 and running 2 to 10 times faster than other microkernels in benchmarks.
Select fire
Select fire, also called selective fire, is a firearm's capability to be switched by the user among modes such as safe, semi-automatic, three-round burst, and full automatic fire.
Select Star (company)
Select Star is a San Francisco data catalog company founded in 2020 by Shinji Kim, offering automated lineage, popularity metrics, and Ask AI; acquired by Snowflake in November 2025.
Select Water Solutions
Select Water Solutions is an American water management and chemical company for the oil and gas industry, founded in 2008 and headquartered in Gainesville, Texas.
Selected mapping
Selected mapping, also called selective mapping, is a distortionless technique that reduces the peak-to-average power ratio of OFDM signals by transmitting the best of several phase-rotated candidates.
Selection (genetic algorithm)
Selection is the genetic algorithm operator that chooses which individuals become parents of the next generation, favoring fitter individuals through schemes such as roulette wheel, rank, and tournament selection.
Selection algorithm
A selection algorithm finds the k-th smallest, or i-th smallest, element of a collection of n unordered elements without sorting, studied through the minimum number of comparisons needed.
Selection combining
Selection combining (SC) is a diversity reception technique in wireless communications in which a receiver uses only the fading signal branch with the highest signal-to-noise ratio.
Selection sort
Selection sort is a simple in-place sorting algorithm that repeatedly selects the smallest remaining element and swaps it into position, always taking Θ(n²) comparisons and at most n swaps.
Selective emitter solar cell
A selective emitter solar cell is a crystalline silicon solar cell whose front emitter is doped non-uniformly: heavily under the metal contacts and lightly between them, improving efficiency.
Selective epitaxial growth
Selective epitaxial growth (SEG) is a crystal growth technique that deposits a single-crystal semiconductor layer only through open windows in a mask, used in CMOS for raised and embedded source and drain regions.