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EUSO-Balloon
EUSO-Balloon was a balloon-borne ultraviolet telescope flown by the French space agency CNES from Timmins, Ontario, in August 2014 as a pathfinder for JEM-EUSO, recording the first downward-looking laser tracks at 38 km altitude.
Eutrophication
Eutrophication, also spelled eutrofication, is the overenrichment of a water body with nutrients, mainly nitrogen and phosphorus from fertilizer runoff and sewage, causing algal blooms, oxygen depletion, and biodiversity loss.
EV Lacertae
EV Lacertae, also called EV Lac or Gl 873, is a young M-dwarf flare star in Lacerta about 16 light-years away, known for its 2008 superflare.
Eva Andrei
Eva Y. Andrei is a Romanian-born American experimental condensed-matter physicist at Rutgers University, known for observing Landau levels and the fractional quantum Hall effect in graphene.
Eva Blasco
Eva Blasco is a Spanish polymer chemist and materials scientist who has been a full professor at Heidelberg University since 2023, developing sustainable polymer materials for 3D and 4D printing.
Eva Hevia
Eva Hevia is a Spanish inorganic and organometallic chemist, born in Gijón, who has been Professor of Inorganic Chemistry at the University of Bern since 2019.
Eva Löcherbach
Eva Löcherbach (born 1970) is a German probability theorist working in France, a professor at Université Paris 1 Panthéon-Sorbonne known for the Galves–Löcherbach model of spiking neural networks.
Éva Tardos
Éva Tardos, born 1957 in Budapest, is a Hungarian-born theoretical computer scientist and Cornell professor known for quantifying the efficiency of selfish routing and for algorithmic game theory.
Evaluated Nuclear Data File
The Evaluated Nuclear Data File (ENDF) is a system of formats and libraries for evaluated nuclear reaction data, especially neutron cross sections, begun at Brookhaven National Laboratory in 1964.
Evaluation
Evaluation is the systematic, objective assessment of an intervention's design, implementation, and results, including unexpected outcomes and causality, undertaken to judge merit and worth and to support accountability and learning.
Evanescent field
An evanescent field is a non-propagating electromagnetic field, also called an evanescent wave, that forms at an interface during total internal reflection and decays exponentially with distance.
Evangelista Torricelli
Evangelista Torricelli (1608–1647) was an Italian physicist and mathematician who invented the mercury barometer, first demonstrating atmospheric pressure, and succeeded Galileo as mathematician to the Grand Duke of Tuscany.
Evaporation
Evaporation is the process by which a liquid changes into a gas below its boiling point, as molecules escape from the surface and cool the liquid remaining.
Evaporation pan
An evaporation pan is a shallow, open, water-filled container used to measure the rate of evaporation from a free water surface, most often to estimate reference evapotranspiration for irrigation scheduling.
Evaporation-induced self-assembly
Evaporation-induced self-assembly (EISA) is a materials fabrication method, named in 1999 by C. Jeffrey Brinker and colleagues, in which solvent evaporation organizes precursors into ordered mesostructured solids.
Evaporative cooling (atomic physics)
Evaporative cooling, also called magnetic evaporative cooling, cools trapped gases of atoms by allowing the most energetic particles to escape, and it is the standard route to Bose-Einstein condensation.
Evaporative light scattering detection
Evaporative light scattering detection (ELSD), also known as evaporative light scattering, is a quasi-universal chromatography detector that nebulizes the column effluent, evaporates the mobile phase, and measures scattered light.
Evaporator
An evaporator is a device that concentrates a solution by boiling off a volatile solvent, usually water, and removing the vapor, leaving a concentrated product behind.
Evaporite
An evaporite is a nonclastic sedimentary rock formed when minerals precipitate from saline water as it evaporates, typically including gypsum, anhydrite, and halite (rock salt).
Evapotranspiration
Evapotranspiration is the combined transfer of water vapor to the atmosphere by evaporation from soil and water surfaces and transpiration through plants, key to irrigation and drought planning.
Évariste Galois
Évariste Galois (1811–1832) was a French mathematician who founded Galois theory and gave the precise criterion for solving polynomial equations by radicals; he died in a duel at 20.
Evelyn Hu
Evelyn Hu is an American applied physicist and electrical engineer, the Tarr-Coyne Professor at Harvard, known for nanofabrication and quantum photonics research and elected to the National Academy of Sciences.
Even and odd functions
Even and odd functions satisfy f(-x) = f(x) and f(-x) = -f(x), giving y-axis and origin symmetry; examples include x², cos x, x³, and sin x.
Even-denominator fractional quantum Hall state in bilayer graphene
The even-denominator fractional quantum Hall state in bilayer graphene is a collective electronic phase at half-filled Landau levels, first observed in 2014 and a candidate host of non-Abelian quasiparticles.
Evening
Evening is the part of the day between afternoon and bedtime, when daylight fades; scientifically, its boundaries are fixed by the sun's position through civil, nautical, and astronomical twilight.
Event (probability theory)
In probability theory, an event, also called a random event, is a subset of the sample space of a random experiment, such as rolling an even number on a die.
Event generator
An event generator is a Monte Carlo computer program that produces simulated particle-collision events, listing every particle and its momentum, so high-energy physics models can be compared with detector measurements.
Event history calendar
An event history calendar (EHC), also called the life history calendar, is a survey instrument that records retrospective life events on a grid with a timeline.
Event horizon
An event horizon is a boundary in spacetime beyond which nothing, not even light, can escape; for a black hole, escape velocity there equals light speed.
Event Horizon Telescope
The Event Horizon Telescope is a global network of radio telescopes linked into one Earth-sized virtual telescope, which released the first image of a black hole in April 2019.