Physical world and mathematics

Jerzy Łoś

Jerzy Łoś (1920–1998) was a Polish mathematician and logician who defined the ultraproduct construction and proved the fundamental Łoś theorem, with further results in algebra, probability, and economics.

Jerzy Neyman

Jerzy Neyman (1894–1981) was a Polish statistician who co-created the Neyman–Pearson theory of hypothesis testing, introduced confidence intervals, founded the statistics department at Berkeley, and received the 1968 National Medal of Science.

Jerzy Plebański

Jerzy Franciszek Plebański (1928–2005) was a Polish mathematical physicist who co-wrote the classic Motion and Relativity with Leopold Infeld and founded the Mexican relativity school at CINVESTAV in Mexico City.

Jesper V. Olsen

Jesper V. Olsen is a Danish mass spectrometrist and proteomics researcher, professor at the University of Copenhagen, known for quantitative phosphoproteomics and the TiO2 enrichment method.

Jess F. Adkins

Jess F. Adkins is an American chemical oceanographer and paleoceanographer at Caltech since 2000, known for developing deep-sea corals as an archive of past deep-ocean circulation.

Jesse Beams

Jesse Wakefield Beams (1898–1977) was an American experimental physicist at the University of Virginia who invented the magnetically suspended ultracentrifuge, beginning the gas-centrifuge method of uranium enrichment.

Jesse Douglas

Jesse Douglas (1897–1965) was an American mathematician who solved the Plateau problem, earning one of the two first Fields Medals in 1936 and later teaching at City College of New York.

Jesse DuMond

Jesse DuMond (1892–1976) was an American experimental physicist at Caltech known for X-ray spectroscopy and, with E. Richard Cohen, the standard least-squares adjustments of the atomic constants.

Jesse L. Beauchamp

Jesse L. Beauchamp is an American chemist at Caltech known for ion cyclotron resonance spectroscopy and gas-phase ion chemistry, and a member of the National Academy of Sciences.

Jesse L. Greenstein

Jesse L. Greenstein was an American astronomer at Caltech who built its astronomy program around the 200-inch Hale Telescope and became the leading observational student of white dwarfs.

Jessica Elzea Kogel

Jessica Elzea Kogel was an American mining geologist who led NIOSH's mining research program from 2016 to 2022 and joined the National Academy of Engineering in 2019.

Jessica Fridrich

Jessica Fridrich, born 1964 in Ostrava, Czech Republic, is a Binghamton University professor known for steganography and camera forensics and for systematizing the CFOP speedcubing method.

Jessica Jewell

Jessica Jewell is a professor at Chalmers University of Technology in Sweden and the University of Bergen who studies whether energy transitions assumed by climate models can happen.

Jessica Meir

Jessica Meir, also known as Jessica Ulrika Meir, is an American NASA astronaut and marine physiologist who performed the first all-female spacewalk in 2019 and commanded SpaceX Crew-12 in 2026.

Jessica Tierney

Jessica E. Tierney is an American paleoclimatologist and professor at the University of Arizona who reconstructs past climates and serves as a lead author on the IPCC Sixth Assessment report.

Jessie Christiansen

Jessie Christiansen is an Australian astrophysicist who serves as Chief Scientist of the NASA Exoplanet Science Institute at Caltech and leads the NASA Exoplanet Archive.

Jessie MacWilliams

Florence Jessie Collinson MacWilliams (1917–1990) was a British-born mathematician at Bell Laboratories whose 1963 MacWilliams identities became a standard coding theory tool; she also co-wrote the field's encyclopedic 1977 textbook.

Jesus Carrera

Jesús Carrera is a Spanish hydrogeologist and Research Professor at Spain's CSIC since 2006, known for inverse modeling of groundwater flow, reactive transport simulation, and managed aquifer recharge.

Jet impingement cooling

Jet impingement cooling is a convective technique in which high-velocity fluid jets strike a heated surface to strip its insulating boundary layer, achieving heat transfer far higher than parallel flow.

Jet loop reactor

A jet loop reactor (JLR) is a gas-liquid chemical reactor in which a high-velocity jet nozzle drives internal circulation, giving strong mass transfer for chemical, biochemical, and wastewater uses.

Jet noise

Jet noise is the broadband sound generated by turbulent mixing of a high-velocity aircraft exhaust with surrounding air, scaling with roughly the eighth power of jet velocity.

Jet quenching

Jet quenching is the loss of energy by high-momentum quarks and gluons as they traverse the quark–gluon plasma in relativistic heavy-ion collisions, first observed at RHIC.

Jet streak

A jet streak is a localized core of relative maximum wind speed within a jet stream, whose entrance and exit regions govern cyclone development and precipitation.

Jet stream

The jet stream is a narrow band of strong wind in the upper atmosphere, blowing west to east, that steers weather systems and causes clear-air turbulence.

Jet substructure

Jet substructure refers to analysis techniques in particle physics that study the internal structure of jets to identify boosted heavy particles like top quarks and W, Z, or Higgs bosons.

Jethro Teall

Jethro Teall (1849–1924) was a British geologist who wrote the landmark British Petrography (1888) and directed the Geological Survey of Great Britain from 1901 to 1914.

Jeu de taquin

Jeu de taquin is an algorithm in algebraic combinatorics, introduced by Marcel-Paul Schützenberger in 1977, that transforms a skew Young tableau into a straight-shape tableau by sliding entries.

Jewel bearing

A jewel bearing is a bearing in which a hard, polished stone, today almost always synthetic ruby, supports a small pivot, best known from mechanical watches.

Jewel Box (star cluster)

The Jewel Box, also called the Kappa Crucis Cluster (NGC 4755), is a young open star cluster in the constellation Crux, nicknamed by John Herschel in the 1830s.