transition métastable

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• TRANSITION ORDRE-DÉSORDRE — Dans un gaz idéal, les atomes (ou les molécules) sont distribués parfaitement au hasard les uns par rapport aux autres: c’est un modèle de désordre géométrique parfait. Dans un cristal idéal, l’arrangement des atomes donne, au contraire, l’image… …   Encyclopédie Universelle

• metastable — metastability /met euh steuh bil i tee/, n. /met euh stay beuhl, met euh stay /, adj. 1. Metall. chemically unstable in the absence of certain conditions that would induce stability, but not liable to spontaneous transformation. 2. Also, labile.… …   Universalium

• metastable — 1. Of uncertain stability; in a condition to pass into another phase when slightly disturbed; e.g., water, when cooled below the freezing point may remain liquid but will at once congeal if a piece of ice is added. 2. Denoting the excited… …   Medical dictionary

• metastable — me•ta•sta•ble [[t]ˈmɛt əˌsteɪ bəl, ˌmɛt əˈsteɪ [/t]] adj. 1) mel Metall. chemically unstable in the absence of certain conditions that would induce stability, but not liable to spontaneous transformation 2) phs Physics, Chem. pertaining to a body …   From formal English to slang

• Glass transition — The liquid glass transition (or glass transition for short) is the reversible transition in amorphous materials (or in amorphous regions within semicrystalline materials) from a hard and relatively brittle state into a molten or rubber like state …   Wikipedia

• Phase transition — This diagram shows the nomenclature for the different phase transitions. A phase transition is the transformation of a thermodynamic system from one phase or state of matter to another. A phase of a thermodynamic system and the states of matter… …   Wikipedia

• Spin transition — The spin transition is one of the most spectacular example of transitionbetween two electronic states in molecular chemistry. The ability of to evolve from a stable to another stable (or metastable) electronicstate in a reversable and detectable… …   Wikipedia

• LUMINESCENCE — On appelle luminescence l’émission de tout rayonnement électromagnétique visible, ultraviolet ou infrarouge, qui n’est pas d’origine purement thermique. Des phénomènes de luminescence sont connus depuis des milliers d’années; on en trouve des… …   Encyclopédie Universelle

• Technetium — molybdenum ← technetium → ruthenium Mn ↑ Tc ↓ Re …   Wikipedia

• Metastability in the brain — In the field of computational neuroscience, the theory of metastability refers to the human brain’s ability to integrate several functional parts and to produce neural oscillations in a cooperative and coordinated manner, providing the basis for… …   Wikipedia

• Coronal radiative losses — In astronomy and in astrophysics, for radiative losses of the solar corona, it is meant the energy flux irradiated from the external atmosphere of the Sun (traditionally divided into chromosphere, transition region and corona), and, in particular …   Wikipedia