Technology and the built world

Jointed plain concrete pavement

Jointed plain concrete pavement (JPCP) is unreinforced Portland cement concrete pavement whose cracking is controlled by contraction joints, and it is the most common concrete pavement type worldwide.

Joist

A joist is a horizontal structural member that supports a floor or ceiling, running in parallel rows between beams or walls. Wood I-joists, first made in 1969, span farther than sawn lumber.

Jokhang

Jokhang (ཇོ་ཁང་, 大昭寺) is a Buddhist temple in central Lhasa, Tibet, founded in the 7th century and regarded as Tibet's holiest shrine; it houses the sacred Jowo Shakyamuni statue.

Joliet 29 Generating Station

Joliet 29 Generating Station is a retired two-unit steam power plant on the Des Plaines River in Joliet, Illinois, coal-fired from 1965 and converted to natural gas in 2016.

Joliot-Curie (supercomputer)

Joliot-Curie is a French petascale supercomputer owned by GENCI and operated at the CEA's TGCC near Bruyères-le-Châtel, replacing Curie in 2018 as France's main open research machine.

Jolly Roger

The Jolly Roger is the traditional pirate flag, usually a white skull and crossbones on black, flown from the late 17th century to frighten targets into surrendering.

Jolt Energy

Jolt Energy is a Dublin and Munich-based charge point operator founded by Maurice Neligan, offering battery-buffered urban chargers delivering up to 320 kW, adding up to 100 km of range in five minutes.

Jolywood

Jolywood is a Chinese photovoltaic manufacturer founded in 2008 in Changshu, Jiangsu, that began with solar module backsheets and expanded into n-type TOPCon cells, listed in Shenzhen since 2014.

Jomo Kenyatta International Airport

Jomo Kenyatta International Airport (JKIA) is Kenya's main international airport, serving Nairobi from Embakasi about 15 km from the city center as the hub of Kenya Airways.

Jon Edward Khachaturian

Jon Edward Khachaturian is an American civil engineer, founder and CEO of Versabar, Inc., elected to the National Academy of Engineering in 2010 for innovative heavy lifting systems.

Jon Kleinberg

Jon Kleinberg is a computer scientist at Cornell University in Ithaca, New York, best known for the HITS algorithm and for work on the algorithmic aspects of the small-world phenomenon.

Jon P. Longtin

Jon P. Longtin is an American mechanical engineer and professor at Stony Brook University whose research centers on thermal sciences, laser-liquid interactions, and laser-based temperature measurement.

Jon Postel

Jon Postel, also known as Jonathan Postel, was an American computer scientist who edited the RFC series and directed IANA, shaping the Internet's address system and core protocols.

Jonas Andrulis

Jonas Andrulis, born 1981 in West Berlin, is a German AI entrepreneur, a former Apple AI researcher, and the founder of Heidelberg AI company Aleph Alpha, which he led until 2025.

Oct 10, 2026

Jonas Eliasson

Jonas Eliasson is a Swedish transport researcher and Director of Transport Access at the Swedish National Transport Administration, best known for designing the Stockholm congestion tax.

Jonas Kibelbek

Jonas Kibelbek is a number theorist who received his Ph.D. from Pennsylvania State University in 2011 and coauthored "Supercongruences and Complex Multiplication," published in the Journal of Number Theory in 2016.

Jonathan Cagan

Jonathan Cagan is an American mechanical engineer and design theorist at Carnegie Mellon University, elected to the National Academy of Engineering in 2026 for design automation and medical technologies.

Jonathan D. Bray

Jonathan D. Bray is an American geotechnical earthquake engineer and Distinguished Professor at UC Berkeley, known for liquefaction, seismic slope, and surface fault rupture procedures.

Jonathan F. Lovell

Jonathan F. Lovell is a biomedical engineer at the University at Buffalo known for porphysomes, reported in 2011, and the CoPoP liposome vaccine platform for malaria.

Jonathan G. Lundgren

Jonathan G. Lundgren is an American agroecologist and entomologist who won the Presidential Early Career Award in 2010 while a USDA research entomologist in Brookings, South Dakota.

Jonathan Livingston Seagull

Jonathan Livingston Seagull is a 1970 fable by Richard Bach about a seagull who leaves his flock to master flight, becoming the best-selling novel of 1972.

Jonathan M. Rothberg

Jonathan M. Rothberg, born 1963, is an American scientist and serial entrepreneur known for bringing next-generation DNA sequencing to market through 454 Life Sciences and Ion Torrent.

Sep 20, 2026

Jonathan N. Coleman

Jonathan N. Coleman is an Irish physicist at Trinity College Dublin who developed liquid-phase exfoliation, a widely used method for producing graphene and other 2D nanosheets from layered crystals.

Jonathan Rea

Jonathan Rea, known as Johnny Rea, is a Northern Irish motorcycle racer who holds World Superbike records with six consecutive titles from 2015 to 2020 and 119 race wins.

Jonathan Ross (AI executive)

Jonathan Ross is a chip designer and AI executive who began Google's Tensor Processing Unit as a side project, then founded the AI chip company Groq in 2016 and led it until joining NVIDIA in 2025.

Oct 10, 2026

Jonathan Rossiter

Jonathan Rossiter is a Professor of Robotics and head of the Soft Robotics group at Bristol Robotics Laboratory, known for artificial muscles, the Right Trousers, and pollution-eating robots.

Jonathan S Marvin

Jonathan S Marvin is a protein engineer and Senior Scientist at HHMI's Janelia Research Campus in Virginia, known for GCaMP5 calcium indicators and SnFR sensors for glutamate, GABA, and ATP.

Jonathan S. Turner

Jonathan S. Turner is a computer scientist at Washington University in St. Louis whose work on high-performance packet switching shaped ATM technology; he was elected to the National Academy of Engineering in 2007.