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Deaerator
A deaerator is a mechanical device that removes dissolved gases, chiefly oxygen and carbon dioxide, from steam boiler feedwater by heating it with steam to prevent corrosion.
Dean A. Watkins
Dean A. Watkins (Dean Allen Watkins) was an American electrical engineer who co-invented the low-noise traveling-wave tube, built the first helix backward-wave oscillator, and co-founded Watkins-Johnson.
Dean B. Harrington
Dean B. Harrington is an American electrical engineer who spent his career at General Electric designing large steam turbine-generators, including early computer-aided design using the IBM 704 from 1956.
Dean DeLongchamp
Dean DeLongchamp is an American materials scientist at NIST in Gaithersburg, Maryland, who leads the Polymer Processing Group and studies polymer thin films for organic electronics.
Dean E. Stephan
Dean E. Stephan is an American civil engineer and construction executive who led Charles Pankow Builders in California and served as American Concrete Institute president in 1994.
Dean F. Peterson
Dean F. Peterson (Dean Freeman Peterson, 1913–1989) was an American civil and water resources engineer at Utah State University and the first Utah resident elected to the National Academy of Engineering.
Dean Kamen
Dean Kamen (Dean Lawrence Kamen), born 1951, is an American engineer and inventor best known for the Segway, the iBOT wheelchair, and founding the robotics nonprofit FIRST.
Dean Roden Chapman
Dean Roden Chapman (1922–1995) was an American aeronautical engineer who spent his career at NASA's Ames Research Center, rising to Director of Astronautics, and was elected to the National Academy of Engineering in 1975.
Dean Takahashi
Dean Takahashi is an American business journalist who founded GamesBeat within VentureBeat in 2008 and is known for his insider Xbox books Opening the Xbox and The Xbox 360 Uncloaked.
Dean Wooldridge
Dean Wooldridge (1913–2006) was an American physicist and engineer who co-founded the Ramo-Wooldridge Corporation, later TRW, and in retirement published original research on nerve-cell membranes.
Dearborn Station
Dearborn Station (Polk Street Station), Chicago's 1885 Romanesque Revival intercity terminal at 47 W. Polk Street, built by the Chicago & Western Indiana; closed May 2, 1971; trainshed demolished 1976; landmark headhouse survives.
Death of Dag Hammarskjöld
The death of Dag Hammarskjöld occurred in September 1961 when his plane crashed near Ndola, Northern Rhodesia (now Zambia), killing the UN Secretary-General and 14 others.
Death of Harry Dunn
The death of Harry Dunn was the 2019 killing of a 19-year-old British motorcyclist in a head-on collision with a car driven by Anne Sacoolas outside RAF Croughton.
Death of Ricky Nelson
The death of Ricky Nelson occurred on December 31, 1985, when his DC-3 caught fire in flight and crashed near De Kalb, Texas, killing Nelson, his fiancée, and five band members.
Death of Stevie Ray Vaughan
The death of Stevie Ray Vaughan occurred on August 27, 1990, when a helicopter carrying the American blues guitarist crashed near Elkhorn, Wisconsin, killing all five aboard.
Death of Suchir Balaji
The death of Suchir Balaji, a 26-year-old former OpenAI researcher who had publicly accused the company of copyright violations, occurred in San Francisco in November 2024.
Death ray
The death ray, also known as the death beam, is a hypothetical directed-energy weapon pursued from the 1870s through World War II but never built as described.
Deaths linked to chatbots
Deaths linked to chatbots, also called chatbot deaths, are suicides and other fatalities in which AI systems like Character.AI or ChatGPT are alleged to have contributed, prompting wrongful-death lawsuits from 2024.
Deb Roy
Deb Roy is a Canadian computer scientist and MIT Media Lab professor known for the Human Speechome Project and for co-founding Bluefin Labs, acquired by Twitter in 2013.
Debasis Mitra
Debasis Mitra is an electrical engineer known for research on communication networks, with a 44-year Bell Labs career and election to the National Academy of Engineering in 2003.
Debbie A. Niemeier
Debbie A. Niemeier is an American civil and environmental engineer known for research on transportation emissions and air quality, elected to the National Academy of Engineering in 2017.
Debendra Das Sharma
Debendra Das Sharma is an Indian-American computer engineer, Intel Senior Fellow, and chief I/O architect who co-invented the CXL and UCIe interconnect standards and helped establish PCIe.
DeBERTa
DeBERTa is a pre-trained language model developed by Microsoft Research that improves on BERT and RoBERTa, and in 2021 became the first single model to surpass human performance on SuperGLUE.
Debezium
Debezium is an open-source log-based change data capture (CDC) platform begun at Red Hat in 2015, now under the Commonhaus Foundation. It streams row-level database changes as ordered events via Kafka Connect, Debezium Server, or an embedded Java engine.
Debian
Debian is a free operating system of more than 70,000 software packages, begun by Ian Murdock in 1993, whose stable releases come out roughly every two years.
Debian version history
Debian version history, also called Debian release history, covers Debian's releases since 1996, with code names from Toy Story characters and a current stable release, Debian 13 "Trixie", in 2025.
Debit card
A debit card is a payment card that deducts money directly from the cardholder's checking account at purchase or withdrawal, rather than drawing on a line of credit.
Deborah Estrin
Deborah Estrin, born 1959, is a computer scientist and Cornell Tech professor known for directed diffusion in wireless sensor networks, mobile health, and a 2018 MacArthur Fellowship.
Deborah L. Grubbe
Deborah L. Grubbe is an American chemical engineer, president of Operations and Safety Solutions, elected to the National Academy of Engineering in 2023 for improving chemical process safety.
Debugger
A debugger is a program that runs another program under controlled conditions, pausing it at chosen points so a developer can inspect variables, the call stack, and memory to find defects.