- positron process
- Космонавтика: процесс высвобождения позитрона
Универсальный англо-русский словарь. Академик.ру. 2011.
positron process
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Positron emission tomography — (PET) is a nuclear medicine imaging technique which produces a three dimensional image or map of functional processes in the body. The system detects pairs of gamma rays emitted indirectly by a positron emitting radionuclide (tracer), which is… … Wikipedia
Positron annihilation spectroscopy — (PAS) [Positrons in Solids, P. Hautojaervi, Topics in Current Physics 12 Springer Heidelberg 1979] or Positron lifetime spectroscopy is a non destructive spectroscopy technique to study voids and defects in solids.The technique relies on the fact … Wikipedia
Process tomography — consists of tomographic imaging of systems, such as process pipes in industry. In tomography the 3D distribution of some physical quantity in the object is determined. There is a widespread need to get tomographic information about process. This… … Wikipedia
positron — /poz i tron /, n. Physics. an elementary particle having the same mass and spin as an electron but having a positive charge equal in magnitude to that of the electron s negative charge; the antiparticle of the electron. Also called antielectron,… … Universalium
positron emission tomography — the process of producing a PET scan. Cf. PET scanner. * * * ▪ imaging technique imaging technique used in diagnosis and biomedical research. It has proved particularly useful for studying brain and heart functions and certain biochemical… … Universalium
positron emission tomography — noun using a computerized radiographic technique to examine the metabolic activity in various tissues (especially in the brain) • Syn: ↑PET • Hypernyms: ↑imaging, ↑tomography * * * the process of producing a PET scan. Cf. PET scanner. * * *… … Useful english dictionary
positron emission tomography — pos′itron emis sion tomog raphy n. med the process of producing a PET scan Compare PET scanner … From formal English to slang
Electron-positron annihilation — occurs when an electron and a positron (the electron s anti particle) collide. The result of the collision is the conversion of the electron and positron and the creation of gamma ray photons or, less often, other particles. The process must… … Wikipedia
P-process — The term p process (p is for proton) is used in two ways in the scientific literature concerning the astrophysical origin of the elements (nucleosynthesis). Originally it referred to a proton capture process which is the source of certain,… … Wikipedia
Oxygen-burning process — The oxygen burning process is a set of nuclear fusion reactions that take place in massive stars that have used up the lighter elements in their cores. It occurs at temperatures around 1.5×109 K / 130 keV and densities of 1010 kg/m3. The… … Wikipedia
Silicon burning process — In astrophysics, silicon burning is a two week [http://arxiv.org/pdf/astro ph/0601261 The physics of core collapse supernovae, Woosley and Janka] ] sequence of nuclear fusion reactions that occur in massive stars with a minimum of about 8–11… … Wikipedia
