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Irish Aviation Authority
The Irish Aviation Authority (IAA) is Ireland's national civil aviation regulator, a commercial semi-state agency established in 1993 covering safety, security, economic, and consumer matters.
Irish Water
Irish Water, known as Uisce Éireann since 31 December 2022, is Ireland's national regulated water utility, created in 2013 to combine 31 local authorities' water and wastewater services.
Irit Dinur
Irit Dinur, born 1973 in Jerusalem, is an Israeli theoretical computer scientist known for her combinatorial proof of the PCP theorem and locally testable codes, and a professor at the Institute for Advanced Study.
IRiver (아이리버)
IRiver (아이리버), originally ReignCom founded in 1999, is a South Korean electronics brand that became the world's top MP3 player maker before Apple's iPod displaced it.
IRIX
IRIX, also known as SGI IRIX, is a UNIX operating system based on System V Release 4 that Silicon Graphics developed for its MIPS workstations and servers, known for its XFS filesystem and OpenGL graphics integration.
Irkutsk-10 power station
Irkutsk-10 power station (Иркутская ТЭЦ-10, also CHPP-10) is a coal-fired combined heat and power plant in Angarsk, Russia, the largest thermal power station in Irkutsk Oblast.
IRobot
iRobot Corporation, also known as IS Robotics, is an American consumer robotics company founded in 1990, best known for the Roomba robot vacuum introduced in 2002.
iRobot Create
iRobot Create is a programmable mobile robot base from iRobot, derived from the Roomba vacuum with the vacuum hardware removed and sold for education and development.
Iron and steel industry in India
India's iron and steel industry is the world's second-largest crude steel producer after China, with production of 152.18 million tonnes and capacity of 200.33 million tonnes in 2024-25.
Iron and steel slag
Iron and steel slag is the nonmetallic coproduct of blast-furnace ironmaking and steel refining, formed from ore impurities and limestone flux, used mainly in cement and road construction.
Iron Duke engine
The Iron Duke, also known as the GM Tech IV, is a 2.5-liter inline-four engine developed by Pontiac and built by General Motors from 1977 to 1993, powering the USPS Grumman LLV postal truck.
Iron flow battery
An iron flow battery is a redox flow battery that stores energy in iron, salt, and water electrolytes, offering cheap, non-flammable, long-duration stationary storage for renewable-heavy grids.
Iron fluoride
Iron fluoride, mainly iron(III) fluoride (FeF₃) and iron(II) fluoride (FeF₂), is a conversion-type cathode material for lithium-ion batteries whose multi-electron reactions give far higher theoretical capacity than conventional cathodes.
Iron gall ink
Iron gall ink, also called oak gall ink, is a writing ink made from oak galls and iron sulfate, the standard writing ink in Europe from the 5th century to the 1900s.
Iron Gate Dam (California)
Iron Gate Dam was an earth-fill hydroelectric dam on the Klamath River in Siskiyou County, California, removed in 2024 in the largest dam removal in US history.
Iron Gate I Hydroelectric Power Station
Iron Gate I Hydroelectric Power Station, known in Romanian as Porțile de Fier I, is a dam and hydroelectric plant on the Danube between Romania and Serbia.
Iron Gate II Hydroelectric Power Station
Iron Gate II Hydroelectric Power Station, known in Romanian as Porțile de Fier II, is a joint Romanian-Serbian dam on the Danube River, built from 1977 and operating from the mid-1980s.
Iron hexacyanoferrate cathode
An iron hexacyanoferrate (FeHCF) cathode is a Prussian blue analog electrode material for sodium-ion and potassium-ion batteries, storing sodium through the Fe2+/Fe3+ couple in an open cubic framework.
Iron phosphate
Iron phosphate, FePO₄, is an inorganic compound serving as the iron and phosphorus source for lithium iron phosphate (LFP) battery cathodes, now a commodity-scale battery intermediate with purity and cost shaping the supply chain.
Iron pillar of Delhi
The Iron pillar of Delhi is a wrought-iron pillar over 7 meters tall and 7 tonnes heavy in the Qutb complex, famed for resisting rust for some 1,600 years.
Iron Ring
The Iron Ring is a ring worn on the little finger by Canadian engineers, given since 1925 at the private Ritual of the Calling of an Engineer.
Iron sights
Iron sights, also known as mechanical sights, are the fixed, unpowered aiming devices built onto a firearm, aligning a front post with a rear notch or aperture by eye.
Iron single-atom catalysts for oxygen reduction in fuel cells
Iron single-atom catalysts for oxygen reduction are platinum-group-metal-free electrocatalysts in which isolated iron atoms bonded to nitrogen in carbon, chiefly FeN₄ sites, catalyze the oxygen reduction reaction in fuel cells.
Iron sponge process
The iron sponge process removes hydrogen sulfide from sour gas and biogas by passing it through wood chips coated with hydrated iron oxide, one of the oldest purification methods.
Iron-air battery
An iron-air battery is a rechargeable metal-air battery that stores energy by reversibly oxidizing iron. Its very low cost makes it a candidate for multi-day grid-scale storage.
Iron-chromium redox flow battery
The iron-chromium redox flow battery (ICRFB) is a redox flow battery that stores energy in acidic iron and chromium electrolytes, invented at NASA in the 1970s.
Iron–carbon phase diagram
The iron–carbon phase diagram maps which phases of iron and carbon coexist at equilibrium by temperature and carbon content, underpinning the metallurgy of steel and cast iron.
Iron–nitrogen–carbon catalysts
Fe-N-C, short for iron-nitrogen-carbon, is a platinum-free fuel cell catalyst class whose atomically dispersed iron-nitrogen sites catalyze the oxygen reduction reaction, though durability remains its weakness.
Iron–nitrogen–carbon catalysts for acidic fuel cells
Iron–nitrogen–carbon (Fe–N–C) catalysts are non-precious-metal electrocatalysts made of atomically dispersed iron sites on nitrogen-doped carbon, the most active platinum-free catalysts for oxygen reduction in acidic fuel cells.
Iron–nitrogen–carbon single-atom CO2 catalyst
The iron–nitrogen–carbon single-atom CO2 catalyst (Fe–N–C) is an electrocatalyst whose isolated FeN4 sites in nitrogen-doped carbon convert carbon dioxide to carbon monoxide, while iron clusters instead favor hydrogen evolution.