61,984 articles
SimpleQA
SimpleQA is an OpenAI factuality benchmark released in November 2024, containing 4,326 short fact-seeking questions with single verifiable answers, built adversarially against GPT-4 to measure hallucination rates.
Simplex algorithm
The simplex algorithm, also called the simplex method, is a pivoting method for solving linear programs by moving between vertices of the feasible polyhedron. George Dantzig formulated it in 1947.
Simplex architecture
The Simplex architecture is a runtime assurance design pattern in which a verified-safe baseline controller takes over from an unverified advanced controller when safety is at risk.
SimpleX Chat
SimpleX Chat is a free, open-source messaging platform, first released in 2022, whose protocol assigns users no identifiers of any kind, not even random numbers.
Simplified Aid For EVA Rescue
The Simplified Aid For EVA Rescue (SAFER) is a small propulsive backpack worn on spacewalks, letting a drifting astronaut fly back to the spacecraft if a tether fails.
Simplified Boiling Water Reactor
The Simplified Boiling Water Reactor is a 670 MWe passively safe boiling water reactor design developed by General Electric in the early 1990s, producing full power by natural circulation.
Simplifly Deccan
Simplifly Deccan was the name of India's first low-cost airline, Air Deccan, after its 2007 acquisition by Vijay Mallya's UB Group, lasting until it was renamed Kingfisher Red on 29 August 2008.
Simplo Technology
Simplo Technology Co., Ltd. (新普科技) is a Taiwanese lithium battery-pack manufacturer founded in 1992, supplying over 200 million packs a year, one in three notebook battery packs globally.
Simplon Tunnel
The Simplon Tunnel is a 19.8 km twin-bore railway tunnel under the Alps linking Brig, Switzerland, with Iselle di Trasquera, Italy, opened in 1906 and long the world's longest.
Simpson's rule
Simpson's rule, also called Simpson's formula, is a Newton-Cotes method that approximates a definite integral by fitting a parabola through three equally spaced points of the integrand.
Simrit Oil and Gas Field
Simrit Oil and Gas Field, also called Ain Sifni, is an operating oil and gas field in the Kurdistan Region of Iraq, operated by Hunt Oil.
Sims-class destroyer
The Sims class was a class of twelve United States Navy destroyers commissioned in 1939 and 1940, the last American destroyer class completed before World War II.
SIMT
SIMT (Single Instruction, Multiple Thread) is an execution model in which many scalar threads run the same instruction while keeping their own registers and control flow.
SIMUL8
SIMUL8 is a discrete event simulation software package, originating with a 1994 Glasgow company and now sold under Minitab, used to model manufacturing, healthcare, and logistics processes before real-world changes.
Simula
Simula is a family of programming languages designed by Ole-Johan Dahl and Kristen Nygaard at the Norwegian Computing Centre in Oslo, first to introduce the concepts behind object-oriented programming.
Simulation
A simulation is a program or experiment on a model that imitates the behavior of a real system, used in physics, biology, economics, and engineering where analytical solutions are impractical.
Simulation Description Format
Simulation Description Format, abbreviated SDF or SDFormat, is an XML format describing robots, objects, and worlds for robot simulation and control, originally developed for Gazebo.
Simulations Plus
Simulations Plus, Inc. is an American biosimulation company incorporated in California in 1996, best known for the GastroPlus pharmacokinetic software platform; it was taken private by Altaris in 2026.
Simulator qualification (FAA)
Simulator qualification is the FAA's process of certifying flight simulators under 14 CFR Part 60 so pilots can earn training credit in a device rather than an aircraft.
SIMULIA
SIMULIA is the simulation software brand of the French company Dassault Systèmes, created in 2005 after acquiring ABAQUS, offering virtual testing of product performance and safety before physical prototypes.
Simultaneous localization and mapping
Simultaneous localization and mapping, also known as concurrent mapping and localization or SLAM, is the computational problem of building a map of an unknown environment while tracking a robot's position within it.
Simultaneous machine translation
Simultaneous machine translation, also known as SiMT or real-time translation, is the task of translating a sentence from partial input before the speaker finishes, trading some quality for lower latency.
Simultaneous multithreading
Simultaneous multithreading (SMT), also called chip-level multithreading, is a processor design technique that lets several hardware threads issue instructions in the same cycle, filling idle execution slots.
Simultaneous nitrification-denitrification
Simultaneous nitrification-denitrification (SND) is a biological wastewater treatment process in which aerobic nitrification and anoxic denitrification proceed in one reactor, converting ammonium to nitrogen gas while cutting aeration energy and reactor footprint.
Simultaneous saccharification and fermentation
Simultaneous saccharification and fermentation (SSF) is a biofuel process in which cellulose is broken down by enzymes and fermented to ethanol in a single reactor.
Simultaneous transmitting and reflecting surface
A simultaneous transmitting and reflecting surface (STAR-RIS), also called an intelligent omni-surface, is a reconfigurable intelligent surface that splits wireless signals into transmitted and reflected parts, giving 360-degree coverage.
Sina Najmaei
Sina Najmaei is a materials scientist and Research Scientist at the DEVCOM Army Research Laboratory who studies defects and grain boundaries in two-dimensional semiconductors, especially monolayer MoS2.
Sinan Keten
Sinan Keten is a Turkish-born mechanical engineer at Northwestern University, the Jan and Marcia Achenbach Professor, who studies polymeric and biomolecular materials and received a 2014 PECASE award.
Sinatra (software)
Sinatra is an open-source web application framework and domain-specific language for quickly creating web applications in Ruby, begun by Blake Mizerany in 2006 and inspired by the microframework Camping.
SINCGARS
SINCGARS, the Single Channel Ground and Airborne Radio System, is a family of VHF-FM combat net radios providing secure tactical command communications for U.S. Army units since 1988.