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Cylindrical grinding
Cylindrical grinding is an abrasive machining process in which a fast-spinning grinding wheel removes material from a rotating round workpiece, finishing shafts, spindles, and similar parts to tight tolerances.
Cylindrical robot
A cylindrical robot is an industrial robot manipulator whose joints form a cylindrical coordinate system, suited to machine loading and among the earliest robot designs.
Cymer
Cymer is a San Diego–based maker of excimer lasers and EUV light sources for semiconductor photolithography, founded in 1986 and acquired by ASML, completed in 2013.
Cynthia Breazeal
Cynthia Breazeal is a roboticist and MIT professor who pioneered social robotics with the expressive robot Kismet and co-founded the consumer robot company Jibo, Inc.
Cynthia Dwork
Cynthia Dwork, born 1958, is an American computer scientist and Harvard professor known for defining differential privacy, foundational work in cryptography, and the 2024 National Medal of Science.
CyPhy Works
CyPhy Works was an American drone manufacturer founded in 2008 in Danvers, Massachusetts, by iRobot co-founder Helen Greiner, best known for its tethered PARC drone.
Cypress (testing framework)
Cypress is a free, open-source testing framework for web applications that runs tests inside the browser instead of driving it externally, supporting end-to-end, integration, and unit testing.
Cyril Furmstone Evans
Cyril Furmstone Evans (circa 1892 to 1959) was the sole Marconi wireless operator aboard the SS Californian when the Titanic sank nearby in April 1912.
Cyril M. Harris
Cyril M. Harris (1917–2011) was an American acoustical engineer and Columbia University professor who designed or renovated more than 100 concert halls, including the Metropolitan Opera House.
Cyril Stanley Smith
Cyril Stanley Smith (1903–1992) was a British-born American metallurgist and historian of technology who directed preparation of fissionable metals for the first atomic bombs at Los Alamos.
Cyril T. O'Connor
Cyril T. O'Connor is a South African chemical engineer at the University of Cape Town, known for minerals processing research and election to the US National Academy of Engineering in 2017.
Cyrillic telegraph codes
Cyrillic telegraph codes adapt Morse and five-unit machine telegraph codes to the Cyrillic alphabet, via Russian Morse code enacted in 1856 and the Soviet three-shift MTK-2 code.
Cyrix 6x86
The Cyrix 6x86, codenamed M1, was an x86 processor introduced by Cyrix in October 1995 as a pin-compatible Pentium competitor, matching it at lower clock speeds.
Cyrus B. Comstock
Cyrus B. Comstock (1831–1910) was an American army engineer, senior aide-de-camp to Ulysses S. Grant, and later director of the Geodetic Survey of the Northern and Northwestern Lakes.
Cyrus W. Field
Cyrus W. Field, born Cyrus West Field, was an American merchant who organized and financed the first transatlantic telegraph cables, succeeding in 1858 and permanently in 1866.
Cython
Cython is an optimizing static compiler for Python and the extended Cython language, which is based on Pyrex. It compiles Python code to C for speed.
Cytiva
Cytiva is a global life sciences company owned by Danaher Corporation, created in 2020 from GE Healthcare's biopharma business, supplying equipment and services for biopharmaceutical manufacturing.
CZ 457
The CZ 457 is a bolt-action rimfire rifle made by Czech manufacturer CZ, introduced in 2019 to replace the CZ 455 and chambered in .22 LR, .22 WMR, and .17 HMR.
CZ 52
The CZ 52 (vz. 52) is a Czechoslovak semi-automatic military pistol chambered in 7.62×25mm Tokarev. Adopted in 1952, it is known for its unusual roller-locked breech.
CZ 75
The CZ 75 is a Czech 9 mm semi-automatic pistol introduced in 1975, known for its slide-inside-frame design and status as the world's second most copied pistol.
CZ 805 BREN
The CZ 805 BREN is a Czech modular gas-piston service rifle chambered in 5.56×45 mm NATO, adopted by the Czech Army in 2010 to replace the vz. 58.
CZ Scorpion Evo 3
The CZ Scorpion Evo 3 is a family of 9×19mm submachine guns and semi-automatic carbines made by CZ in the Czech Republic, first shown in 2009.
Czech Airlines
Czech Airlines (České aerolinie, historically ČSA) was the national airline of Czechoslovakia and later the Czech Republic. Founded in 1923, it ceased flying in 2024.
Czech hedgehog
The Czech hedgehog (Czech: rozsocháč, German: Tschechenigel) is a static anti-tank obstacle of three steel beams, developed in 1930s Czechoslovakia and widely used in World War II.
Czochralski method
The Czochralski method grows single crystals by dipping a seed crystal into a melt and slowly withdrawing it, and it produces 95% of the world's single-crystal silicon.
CZTS solar cell
A CZTS solar cell is a thin-film photovoltaic device with a kesterite copper zinc tin sulfide absorber built from earth-abundant, non-toxic elements in the CIGS architecture.
Czyste Powietrze
Czyste Powietrze (Clean Air) is Poland's national subsidy program for replacing old solid-fuel boilers and improving energy efficiency of single-family homes, run by the government since 2018.
D (programming language)
D, also known as Dlang or Digital Mars D, is a systems programming language created by Walter Bright in 1999 as a successor to C and C++, with version 1.0 in 2007.
D battery
A D battery, also called a D cell or LR20, is a standard-size dry cell battery, 34.2 mm wide and 61.5 mm tall, used in flashlights, radios, and large toys.
D-1 oil field (India)
The D-1 oil field is an offshore field in the Arabian Sea about 200 km southwest of Mumbai, discovered in 1976 and operated by India's ONGC.