All articles starting with H
20,046 articles
Helmholtz coil
A Helmholtz coil, also called a Helmholtz pair, is two identical coaxial coils separated by a distance equal to their radius, producing a nearly uniform magnetic field for calibration.
Helmholtz decomposition
The Helmholtz decomposition, also called the fundamental theorem of vector calculus, states that any vector field splits into a curl-free part given by a scalar potential and a divergence-free part given by a vector potential.
Helmholtz equation
The Helmholtz equation is the elliptic partial differential equation describing the spatial amplitude of a harmonically oscillating wave; it is the time-independent form of the wave equation.
Helmholtz free energy
The Helmholtz free energy, also called the Helmholtz energy or Helmholtz function, is a thermodynamic potential, A = U − TS, minimized at equilibrium at constant temperature and volume.
Helmholtz resonance
Helmholtz resonance, also known as wind throb, is the acoustic resonance of air in a cavity with a constricted neck, such as blowing across a bottle mouth.
Helminthiasis
Helminthiasis, also called parasitic worm infection, is infection of humans with intestinal worms such as roundworm, whipworm, and hookworms, affecting an estimated 1.5 billion people.
Helminthic therapy
Helminthic therapy is an experimental treatment in which patients are deliberately infected with parasitic worms or dosed with their eggs to modulate the immune system in autoimmune disease.
Helminthosporium
Helminthosporium (Link 1809) is a genus of mitosporic ascomycete fungi in Massarinaceae, type species H. velutinum; once a huge catch-all genus whose grass parasites were split into Bipolaris, Curvularia, Drechslera, and Exserohilum.
Helmsman
A helmsman, also called a timonier, is the person who steers a boat or ship, operating a tiller, whipstaff, or ship's wheel on the orders of the officer of the watch.
Helmud Vallis
Helmud Vallis is an IAU-approved 280-km channel feature (vallis) on Venus at 33.9S, 171.3E, adopted in 1997 and named for an Afghanistan river goddess.
Helmut Bantz
Helmut Bantz (1921–2004), West German artistic gymnast; 1956 Melbourne Olympic horse vault gold shared with Valentin Muratov; 18-time German champion; as a British POW he coached the British gymnastics team at the 1948 London Olympics.
Helmut Baumgartner
Helmut Baumgartner is an Austrian-trained cardiologist who directed adult congenital and valvular heart disease at University Hospital Münster, published landmark aortic stenosis research in 2000, and chaired ESC guidelines.
Helmut Beinert
Helmut Beinert (1913–2007) was a German-born American biochemist at the University of Wisconsin–Madison who pioneered EPR spectroscopy of enzymes and discovered the iron-sulfur proteins of the mitochondrial respiratory chain.
Helmut Berger
Helmut Berger (Helmut Steinberger, 1944–2023), Austrian actor, Luchino Visconti's muse and partner; star of The Damned, Ludwig, Conversation Piece, Dynasty, The Godfather Part III; died in Salzburg.
Helmut Braselmann
Helmut Braselmann (Julius Helmut Braselmann, 1911-1993), German field handball forward from Wuppertal's TuRa Barmen; 1936 Olympic gold medalist and 1938 inaugural World Championship winner with Germany.
Helmut Cölfen
Helmut Cölfen (1965–2023) was a German physical and colloid chemist, professor of physical chemistry at the University of Konstanz from 2010, known for discovering stable pre-nucleation clusters and the concept of mesocrystals.
Helmut Drexler
Helmut Drexler (1951–2009) was a German cardiologist who led the Department of Cardiology and Angiology at Hannover Medical School and led the BOOST bone-marrow cell therapy trial.
Helmut E. Sobieczky
Helmut E. Sobieczky is an Austrian aerodynamicist who spent his career at DFVLR, later DLR, in Göttingen, known for shock-free transonic design and the PARSEC parametric airfoil method.
Helmut Grubmüller
Helmut Grubmüller (born 1965 in Munich) is a German computational biophysicist who directs the Department of Theoretical and Computational Biophysics at the Max Planck Institute for Multidisciplinary Sciences in Göttingen.
Helmut Grunsky
Helmut Grunsky (1904–1986) was a German mathematician whose 1939 Grunsky inequalities became a standard tool of geometric function theory and work on the Bieberbach conjecture.
Helmut Harff
Helmut Harff (1939–2018) was a German Bundeswehr brigadier general, nicknamed "Habicht", who led the first German UNOSOM II contingent in Somalia (1993) and German KFOR forces entering Kosovo (1999), later heading the BDI defense committee.
Helmut Hasse
Helmut Hasse (1898–1979) was a German mathematician who shaped 20th-century number theory with the local–global principle, the Brauer–Hasse–Noether theorem, and the Hasse bound for elliptic curves.
Helmut Hofer
Helmut Hofer is a German and American mathematician at the Institute for Advanced Study, a founder of symplectic topology known for Hofer geometry and the Hofer–Zehnder capacity.
Helmut Kentler
Helmut Kentler (1928–2008), German psychologist, sexologist, and professor of social pedagogy at Hannover, placed Berlin foster children with convicted pedophiles from 1969, a practice officially investigated after his death as state-enabled child abuse.
Helmut Kettenmann
Helmut Kettenmann is a German neurobiologist who studies glial cells and microglia, leading cellular neuroscience research at Berlin's Max Delbrück Center from 1993 to 2022.
Helmut Kohl
Helmut Kohl, remembered as the Kanzler der Einheit, is a German CDU politician who was the sixth Chancellor of Germany from 1982 to 1998, leading reunification and the euro.
Helmut Kornig
Helmut Körnig (1905–1972), German sprinter from Głogów; Olympic bronze 200 m and relay silver 1928, relay silver 1932; multiple German sprint champion and world record holder; later ran Westfalenhallen Dortmund.
Helmut Landsberg
Helmut Erich Landsberg (1906–1985) was a German-born American climatologist who directed the U.S. Weather Bureau's Office of Climatology, wrote Physical Climatology, and received the National Medal of Science in 1985.
Helmut Marko
Helmut Marko, Austrian former racing driver, 1971 Le Mans winner with Porsche, and 9-start F1 driver whose career ended at the 1972 French GP; longtime head of the Red Bull Junior Team until leaving Red Bull at the end of 2025.
Helmut Newton
Helmut Newton (Helmut Neustädter, 1920–2004), German-born fashion photographer for French Vogue, known for erotically charged black-and-white images like Rue Aubriot and Big Nudes, books White Women and SUMO, and the Berlin Newton Foundation.