All articles starting with S

Synthetic data

Synthetic data are artificial records generated from models fitted to confidential data, released so analysts can work without seeing real respondent values, a method proposed by Donald B. Rubin in 1993.

Oct 26, 2026

Synthetic Data Vault

Synthetic Data Vault (SDV): open-source Python library from MIT's Data to AI Lab (2016, Patki, Wedge, Veeramachaneni) that builds generative models of relational databases to create realistic synthetic tabular, relational, and time-series data; now developed by DataCebo.

Synthetic diamond

Synthetic diamond, also called laboratory-grown or man-made diamond, is diamond made by industrial processes, mainly HPHT presses and chemical vapor deposition, with the same composition as natural diamond.

Synthetic difference-in-differences

Synthetic difference-in-differences (SDID) is an estimator for causal effects with panel data that combines synthetic control weighting with difference-in-differences regression, introduced by Athey, Imbens, Wager, and coauthors.

Synthetic dimension

A synthetic dimension is a non-spatial degree of freedom, such as an atom's energy levels, treated as an extra lattice dimension for studying higher-dimensional physics.

Synthetic DNA membrane channels

Synthetic DNA membrane channels are artificial ion pores built from DNA origami that insert into lipid bilayers, first demonstrated by researchers in Munich in 2012.

Synthetic element

A synthetic element, also called an artificial or man-made element, is a chemical element that does not occur naturally on Earth and can only be created by nuclear reactions.

Synthetic ferrimagnets

A synthetic ferrimagnet (SFi) is an artificial magnetic multilayer in which unequal ferromagnetic layers coupled antiferromagnetically across a nonmagnetic spacer leave a small tunable net moment.

Synthetic fiber

A synthetic fiber is a textile fiber spun from a synthesized polymer, including polyester, nylon, acrylic, and aramids, making up about 69% of world fiber production.

Synthetic frequency dimension

Synthetic frequency dimensions in photonics are artificial lattices whose sites are the discrete frequency modes of optical resonators; electro-optic modulation makes photons hop between modes, enabling topological gauge fields.

Synthetic fuel

Synthetic fuel, also known as synfuel, is a liquid or gaseous fuel made without refining crude oil, by routes such as coal-to-liquids, gas-to-liquids, or e-fuels from hydrogen and captured CO2.

Synthetic gauge field

A synthetic gauge field is an engineered condition making neutral particles or waves, such as photons or cold atoms, behave like charged particles in a magnetic field.

Synthetic gauge fields for phonons

Synthetic gauge fields for phonons are engineered effective vector potentials that act on sound and lattice vibrations like magnetic fields on charges, enabling Landau levels, nonreciprocal transport, and topological waveguiding.

Synthetic gauge fields for photons

Synthetic gauge fields for photons are engineered conditions, created by geometry, strain, or time-dependent modulation, under which uncharged light behaves as a charged particle in a magnetic field.

Synthetic gauge fields in ultracold atoms

Synthetic gauge fields in ultracold atoms are engineered potentials, created mainly through laser-atom interactions, that make neutral atoms move as if charged, enabling studies of the quantum Hall effect and spin-orbit coupling.

Synthetic graphite

Synthetic graphite, also called artificial graphite, is graphite made by heating petroleum coke and coal tar pitch to about 3000 °C, a key lithium-ion battery anode material.

Synthetic ion channel

A synthetic ion channel is a human-made molecule or assembly that inserts into a lipid bilayer and conducts ions, mimicking natural channel proteins, first reported in 1982.

Synthetic language

A synthetic language packs several morphemes into single words, expressing tense, case, number, and person word-internally, unlike analytic languages such as Chinese and Vietnamese; measured by Greenberg's morpheme-per-word index of synthesis.

Synthetic melanin

Synthetic melanin is a laboratory-made mimic of the natural pigment melanin, most often polydopamine, made by oxidative polymerization of dopamine and studied for drug delivery, coatings, and bioelectronics.

Sep 29, 2026

Synthetic minority over-sampling technique

The synthetic minority over-sampling technique (SMOTE) is a machine learning method for imbalanced classification that creates synthetic minority-class samples by interpolating between existing samples and their nearest neighbors.

Sep 29, 2026

Synthetic minority oversampling technique

The synthetic minority oversampling technique (SMOTE) is a preprocessing method for imbalanced classification that creates synthetic minority-class samples by interpolating between existing neighbors, introduced by Chawla and colleagues in 2002.

Synthetic Mn4CaO5 cubane clusters

Synthetic Mn4CaO5 cubane clusters are laboratory-made manganese–calcium oxide complexes that mimic the oxygen-evolving complex of photosystem II, the natural Mn4CaO5 cluster that splits water into oxygen in plants and cyanobacteria.

Synthetic oil

Synthetic oil, also known as synthetic motor oil or synthetic lubricants, is a lubricant made by chemical synthesis rather than refined from crude oil, performing better at temperature extremes.

Synthetic rubber

Synthetic rubber is any artificial elastomer made from petroleum or natural gas monomers to imitate natural rubber; styrene-butadiene rubber, used mostly in tires, is the leading type.

Synthetic spider silk

Synthetic spider silk is human-made material reproducing the proteins or mechanical performance of spider dragline silk, made by recombinant expression in bacteria, yeast, plants, goats, or silkworms.

Synthetic training data

Synthetic training data is pretraining text generated by AI models rather than written by humans, used to train language models in place of or mixed with natural web text.

Synthetic-aperture radar

Synthetic-aperture radar (SAR) is an imaging radar technique that synthesizes a long antenna from a moving platform's motion, producing high-resolution images at night and through cloud, rain, and smoke.

Synthetic-based mud

Synthetic-based mud, also called synthetic-based drilling fluid, is a drilling fluid whose continuous phase is a synthetic organic material rather than oil, developed in the early 1990s.

Synthetism

Synthetism is a Post-Impressionist painting style developed at Pont-Aven, Brittany, around 1888 by Paul Gauguin and Émile Bernard, marked by flat, unmodeled color, strong outlines, and painting from memory rather than from life.