42,772 articles
Kitaev quantum spin liquid in α-RuCl3
The Kitaev quantum spin liquid in α-RuCl3 is a candidate fractionalized magnetic state sought in the honeycomb magnet α-RuCl3 just above its ~6.9 T critical field.
Kite (geometry)
In geometry, a kite, also called a geometric kite, is a quadrilateral with two distinct pairs of equal adjacent sides. It may be convex or, in the concave case, called a dart.
Kite experiment
The kite experiment, also called the kite-and-key experiment, was Benjamin Franklin's June 1752 demonstration that lightning is electricity, drawing charge from storm clouds down a wet string to a metal key.
Kittilä mine
Kittilä mine (Kittilän kaivos) is an underground gold mine in Lapland, northern Finland, operated by Agnico Eagle since 2009 and the largest primary gold mine in Europe.
Kiyoo Wadati
Kiyoo Wadati (和達清夫, 1902–1995) was a Japanese seismologist who established that earthquakes occur at depths of several hundred kilometers, and whose name is attached to the Wadati–Benioff zone.
Kiyoshi Itō
Kiyoshi Itō (伊藤清, 1915–2008) was a Japanese mathematician and Kyoto University professor who created Itô calculus, giving rigorous meaning to integration along random Brownian paths.
Kiyoshi Oka
Kiyoshi Oka (岡 潔; 1901–1978) was a Japanese mathematician who solved major problems in complex analysis between 1936 and 1953, including the Levi problem and the coherence of the structure sheaf.
Kiyotomi Kaneda
Kiyotomi Kaneda (金田 清臣) is a Japanese catalytic chemist and Osaka University professor emeritus known for hydroxyapatite-supported metal catalysts for green synthesis, winning the first Green Sustainable Chemistry Award in 2001.
Kjeldahl method
The Kjeldahl method, also known as Kjeldahl analysis, is an analytical procedure for measuring total organic nitrogen by acid digestion, distillation, and titration, published by Johan Kjeldahl in 1883.
Klaas‐Jan Tielrooij
Klaas-Jan Tielrooij is a nanoscientist who leads the Ultrafast Dynamics in Nanoscale Systems group, founded at ICN2 in Barcelona in 2018, and became Full Professor at Eindhoven University of Technology in 2026.
Klaatu (The Day the Earth Stood Still)
Klaatu is the humanoid alien emissary of the 1951 science fiction film The Day the Earth Stood Still, portrayed by Michael Rennie and known for the command "Klaatu barada nikto".
Klaus Bechgaard
Klaus Bechgaard (1945–2017) was a Danish chemist and professor at the University of Copenhagen who, with Denis Jérôme, discovered the first organic superconductor in 1979.
Klaus Biemann
Klaus Biemann (1926–2016) was an Austrian-born American chemist at MIT who pioneered organic mass spectrometry, led the Viking molecular analysis experiment on Mars, and developed mass spectrometric protein sequencing that laid the groundwork for proteomics.
Klaus Clusius
Klaus Clusius (1903–1963) was a German physical chemist who invented the thermal diffusion column with Gerhard Dickel in 1938, a device for separating gases and stable isotopes.
Klaus Fuchs
Klaus Fuchs (Klaus Emil Julius Fuchs, 1911–1988) was a German-born theoretical physicist who passed atomic bomb secrets from Los Alamos to the Soviet Union from 1941 to 1949.
Klaus H. Hofmann
Klaus Heinrich Hofmann was a German-born American biochemist and peptide chemist who spent five decades at the University of Pittsburgh and was elected to the National Academy of Sciences in 1963.
Klaus Hasselmann
Klaus Hasselmann, born 1931 in Hamburg, is a German physicist and oceanographer who won the 2021 Nobel Prize in Physics for physical modeling of Earth's climate.
Klaus Hepp
Klaus Hepp (born 1936) is a theoretical physicist, professor at ETH Zurich from 1967 to 2002, known for a rigorous proof of the Bogoliubov-Parasiuk renormalization theorem.
Klaus Hubacek
Klaus Hubacek is an ecological economist and environmental scientist who studies how household consumption drives environmental impacts, and is a professor at the University of Groningen.
Klaus Jänich
Klaus Jänich is a German mathematician who took his doctorate at Bonn in 1964 under Friedrich Hirzebruch and proved the theorem of Atiyah, now called the Atiyah–Jänich theorem.
Klaus Keil
Klaus Keil (1934–2022) was a German-American meteoriticist who co-developed the first energy-dispersive X-ray spectrometer and directed the Institute of Meteoritics at the University of New Mexico.
Klaus Kern
Klaus Kern is a German physicist who directs the Max Planck Institute for Solid State Research in Stuttgart and won the 2008 Leibniz Prize for his work on nanostructures.
Klaus Meerholz
Klaus Meerholz is a physical chemist who has held the chair of physical chemistry at the University of Cologne since 2002, working on OLEDs and organic photovoltaics.
Klaus Mezger
Klaus Mezger, born 1958, is an isotope geochemist and geochronologist, professor of geochemistry at the University of Bern since 2009, now emeritus, known for dating planetary core formation.
Klaus Mølmer
Klaus Mølmer is a Danish theoretical physicist in quantum optics and professor at the Niels Bohr Institute in Copenhagen, known for the Mølmer–Sørensen gate for trapped ions.
Klaus Müllen
Klaus Müllen (born 1947) is a German polymer chemist known for bottom-up synthesis of nanographenes and graphene nanoribbons at the Max Planck Institute for Polymer Research.
Klaus Roth
Klaus Roth (1925–2015) was a British number theorist who won the 1958 Fields Medal, the first British winner, for his theorem on approximating algebraic numbers by rationals.
Klaus Ruedenberg
Klaus Ruedenberg, born 1920 in Germany, is a theoretical chemist at Iowa State University known for orbital localization, even-tempered basis sets, and his wave-mechanical theory of the covalent bond.
Klaus Schmidt‐Rohr
Klaus Schmidt-Rohr, also known as K. Schmidt-Rohr, is a German-born solid-state NMR spectroscopist and professor of chemistry at Brandeis University, known for Nafion fuel-cell membrane research.
Klaus von Klitzing
Klaus von Klitzing, born in 1943, is a German physicist who discovered the quantum Hall effect in 1980 and received the 1985 Nobel Prize in Physics for it.