All articles starting with E

Equivalent circuit model

An equivalent circuit model represents the electrical behavior of a real device, such as a battery, by a network of ideal resistors, capacitors, and inductors.

Equivalent continuous sound level

The equivalent continuous sound level (Leq) is the constant sound level carrying the same acoustic energy as a fluctuating sound over a stated time interval.

Equivalent dose, also known as radiation dose equivalent, is a radiological protection quantity in sieverts, given by tissue absorbed dose multiplied by a radiation weighting factor reflecting biological effectiveness.

Equivalent potential temperature

Equivalent potential temperature, or theta-e, is the temperature an air parcel would reach if all its water vapor condensed and it were brought adiabatically to 1000 mb.

Equivalent salt deposit density

Equivalent salt deposit density (ESDD) is an insulator pollution measure: the sodium chloride mass giving the same conductivity as the deposit, per unit surface area, in mg/cm².

Equivalent single axle load

An equivalent single axle load (ESAL) is a pavement design unit converting any axle's damage into equivalent 18,000-pound single axle loads, the standard traffic input for AASHTO 1993 design.

Equivalent source method

The equivalent source method, also called equivalent sources, is a geophysical technique that fits fictitious sources to gravity or magnetic data for interpolation and continuation.

Equivalent weight

Equivalent weight, also called equivalent mass, is the mass of a substance that supplies or reacts with one equivalent, equal to formula weight divided by n.

Oct 22, 2026

Equivalents

Equivalents is a series of small black-and-white cloud photographs by Alfred Stieglitz, begun in 1922 at Lake George, New York, and widely cited as early abstract photographic art.

Equivalents of the axiom of choice

The equivalents of the axiom of choice are statements provably equivalent to it over ZF, including Tychonoff's theorem, Zorn's lemma, and every vector space having a basis.

Oct 22, 2026

Equivariant Diffusion for Molecule Generation in 3D

Equivariant diffusion for molecule generation in 3D is a family of deep generative methods that produce new 3D molecular structures, founded by the EDM model in 2022.

Equivariant graph neural network

An equivariant graph neural network is a graph neural network whose outputs transform predictably under symmetries such as rotation and translation of 3D structures, used for interatomic potentials.

Equivariant neural network

An equivariant neural network is a neural network whose output transforms predictably when the input is transformed, widely used for 3D atomic systems and point clouds.

Equoidea

Equoidea is a perissodactyl superfamily comprising the horse family Equidae and the extinct European paleotheres (Palaeotheriidae), split from ceratomorphs by the early Eocene about 55 million years ago, with Hyracotherium now restricted to Europe.

Equol

Equol is a non-steroidal isoflavan produced by intestinal bacteria from the soy isoflavone daidzein in about 30% of adults, first isolated from pregnant mares' urine in 1932.

Equuleus

Equuleus, the Little Horse, is a small northern constellation between Pegasus and Delphinus, cataloged by Ptolemy and the second-smallest of the 88 modern constellations, best viewed in September and October.

Equus

Equus is the sole surviving genus of the horse family, containing the living horses, zebras, and asses; it originated in North America and spread during the Pliocene.