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English Wikipedia references for Ac.ru 61-80 of 323
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| Density functional theory Density functional theory (DFT) is a quantum mechanical theory used in physics and chemistry to investigate the electronic structure (principally the ground state) of many-body systems, in particular atoms, molecules, and the condensed phases. With this theory, the properties of a many-electron system can be determined by using functionals, i.e. Density_functional_theory | |
| Hooke's law In mechanics, and physics, Hooke's law of elasticity is an approximation that states that the extension of a spring is in direct proportion with the load added to it as long as this load does not exceed the elastic limit. Materials for which Hooke's law is a useful approximation are known as linear-elastic or "Hookean" materials. Hooke's_law | |
| Top quark The top quark is the third-generation up-type quark with a charge of +e. It was discovered in 1995 by the CDF and D0 experiments at Fermilab, and is the most massive of known elementary particles. (The Higgs boson, which may be as massive, has not yet been experimentally observed.) Its mass is measured at , about the same weight as an atom of rhenium. Top_quark | |
| Kogarkoite Kogarkoite | |
| Chelyabinsk Chelyabinsk () is a city in Russia, located just to the east of the Ural Mountains, on Miass River. It is the administrative center of Chelyabinsk Oblast. Population Chelyabinsk | |
| Stairway to Heaven "Stairway to Heaven" is a song by the English rock band Led Zeppelin. It was composed by guitarist Jimmy Page and vocalist Robert Plant for the band's fourth studio album, Led Zeppelin IV (1971). It was voted #3 in 2000 by VH1 on their list of the 100 Greatest Rock Songs. Stairway_to_Heaven | |
| Pentaquark A pentaquark is a hypothetical subatomic particle consisting of a group of five quarks (compared to three quarks in normal baryons and two in mesons), or more specifically four quarks and one anti-quark (hence it has baryon number 1) and is represented by Θ. Pentaquark | |
| When the Levee Breaks "When the Levee Breaks" is a blues song written and first recorded by husband and wife Kansas Joe McCoy and Memphis Minnie in 1929. The song is in reaction to the upheaval caused by the Great Mississippi Flood of 1927.It was famously re-worked by English rock group Led Zeppelin as the last song on their fourth album, released in 1971. The lyrics in Led Zeppelin's version were partially based on the original recording. When_the_Levee_Breaks | |
| Tokamak Talk:Tokamak | |
| Supercooling Supercooling is the process of lowering the temperature of a liquid or a gas below its freezing point, without it becoming a solid.A liquid below its standard freezing point will crystallize in the presence of a seed crystal or nucleus around which a crystal structure can form. Supercooling | |
| Ricci flow differential geometry, the Ricci flow is an intrinsic geometric flow—a process which deforms the metric of a Riemannian manifold—in this case in a manner formally analogous to the diffusion of heat, thereby smoothing out irregularities in the metric. It plays an important role in the proof of the Poincaré conjecture, one of the seven Millennium Prize Problems for which the Clay Mathematics Institute offers a $1,000,000 prize for a correct solution; see the Solution of the Poincaré conjecture, and in this context is also called the Ricci–Hamilton flow. Ricci_flow | |
| Renormalization group Bjorken scaling. Momentum space RG also became a highly developed tool in solid state physics, but its success was hindered by the extensive use of perturbation theory, which prevented the theory from reaching success in strongly correlated systems. In order to study these strongly correlated systems, variational approaches are a better alternative. Renormalization_group | |
| Noncommutative geometry Noncommutative geometry, or NCG, is a branch of mathematics concerned with the possible spatial interpretations of algebraic structures for which the commutative law fails, that is, for which xy does not always equal yx. For example; 3 steps of 4 units and 4 steps of 3 units length might be different in noncommutative spaces. Noncommutative_geometry | |
| Cosmic string A cosmic string is a hypothetical 1-dimensional (spatially) topological defect in various fields. Cosmic strings are hypothesized to form when the field undergoes a phase change in different regions of spacetime, resulting in condensations of energy density at the boundaries between regions. Cosmic_string | |
| Quantum chaos Quantum chaos is a branch of physics which studies how chaotic classical systems (see dynamical systems and chaos theory) can be shown to be limits of quantum-mechanical systems. The phenomena covered by quantum chaos so far are mainly related to wave theory. Quantum_chaos | |
| Fencing at the 1996 Summer Olympics Talk:Fencing_at_the_1996_Summer_Olympics | |
| Fluctuation theorem fluctuation theorem (FT) is a theorem from statistical mechanics dealing with the relative probability that the entropy of a system which is currently away from thermodynamic equilibrium (away from maximum entropy) will increase or decrease over a given amount of time. Fluctuation_theorem | |
| Self-ionization of water The self-ionization of water (also autoionization of water, and autodissociation of water) is the chemical reaction in which two water molecules react to produce a hydronium ion (H3O+) and a hydroxide ion (OH−) 2 H2O (l) H3O+ (aq) + OH− (aq) Self-ionization_of_water | |
| Black hole thermodynamics Planck length. The black hole entropy is proportional to its area . The fact that the black hole entropy is also the maximal entropy that can be squeezed within a fixed volume was the main observation that led to the holographic principle. The subscript BH either stands for "black hole" or "Bekenstein-Hawking".Although Hawking's calculations gave further thermodynamic evidence for black hole entropy, until 1995 no one was able to make a controlled calculation of black hole entropy based on statistical mechanics, which associates entropy with a large number of microstates. Black_hole_thermodynamics | |
| Colombeau algebra mathematics, the Colombeau algebra is an algebra introduced with the aim of constructing an improved theory of distributions, in which multiplication is not problematic. The origins of the theory are in applications to quasilinear hyperbolic partial differential equations.It is defined as a quotient algebra Colombeau_algebra |
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