“decay”的概念、定义、翻译、参考文献-科学参考

decay

Physics

The spontaneous transformation of one radioactive nuclide into a daughter nuclide, which may be radioactive or may not, with the emission of one or more particles or photons. The decay of N₀ nuclides to give N nuclides after time t is given by N=N₀exp(−γ‎t), where γ‎ is called the decay constant or the disintegration constant. The reciprocal of the decay constant is the mean life. The time required for half the original nuclides to decay (i.e. N=½N₀) is called the half-life of the nuclide. The same terms are applied to elementary particles that spontaneously transform into other particles. For example, a free neutron decays into a proton and an electron (see beta decay). See also alpha particle; Q-value.

https://www.nist.gov/pml/radionuclide-half-life-measurements Values of radionuclide half-lives at the NIST website

Space Exploration

An unwanted descent in altitude of a satellite's orbit. This is usually due to a decrease in speed caused by aerodynamic drag. To counteract this effect, thrusters on a satellite must be fired occasionally to maintain its correct orbital station. A satellite that descends low enough into the atmosphere to burn up is called a decayed satellite.

Chemistry

1. The spontaneous transformation of one radioactive nuclide into a daughter nuclide, which may be radioactive or may not, with the emission of one or more particles or photons. The decay of N₀ nuclides to give N nuclides after time t is given by N = N₀exp(–γ‎t), where γ‎ is called the decay constant or the disintegration constant. The reciprocal of the decay constant is the mean life. The time required for half the original nuclides to decay (i.e. N = ½‎N₀) is called the half-life of the nuclide. The same terms are applied to elementary particles that spontaneously transform into other particles. For example, a free neutron decays into a proton and an electron.
2. The reversion of excited states of atoms or molecules to the ground state.

Chemical Engineering

The spontaneous transformation of one radioactive nuclide into another radionuclide, or into another energy state of the same nuclide with the emission of one or more particles or protons. The decay of N_o number of nuclides to give N number of nuclides after a period of time t is given by $N = N_{o} exp (- γ t)$ where γ is known as the decay constant.

Biology

See decomposition.

单词	decay
释义	decay Physics The spontaneous transformation of one radioactive nuclide into a daughter nuclide, which may be radioactive or may not, with the emission of one or more particles or photons. The decay of N₀ nuclides to give N nuclides after time t is given by N=N₀exp(−γ‎t), where γ‎ is called the decay constant or the disintegration constant. The reciprocal of the decay constant is the mean life. The time required for half the original nuclides to decay (i.e. N=½N₀) is called the half-life of the nuclide. The same terms are applied to elementary particles that spontaneously transform into other particles. For example, a free neutron decays into a proton and an electron (see beta decay). See also alpha particle; Q-value. https://www.nist.gov/pml/radionuclide-half-life-measurements Values of radionuclide half-lives at the NIST website Space Exploration An unwanted descent in altitude of a satellite's orbit. This is usually due to a decrease in speed caused by aerodynamic drag. To counteract this effect, thrusters on a satellite must be fired occasionally to maintain its correct orbital station. A satellite that descends low enough into the atmosphere to burn up is called a decayed satellite. Chemistry 1. The spontaneous transformation of one radioactive nuclide into a daughter nuclide, which may be radioactive or may not, with the emission of one or more particles or photons. The decay of N₀ nuclides to give N nuclides after time t is given by N = N₀exp(–γ‎t), where γ‎ is called the decay constant or the disintegration constant. The reciprocal of the decay constant is the mean life. The time required for half the original nuclides to decay (i.e. N = ½‎N₀) is called the half-life of the nuclide. The same terms are applied to elementary particles that spontaneously transform into other particles. For example, a free neutron decays into a proton and an electron. 2. The reversion of excited states of atoms or molecules to the ground state. Chemical Engineering The spontaneous transformation of one radioactive nuclide into another radionuclide, or into another energy state of the same nuclide with the emission of one or more particles or protons. The decay of N_o number of nuclides to give N number of nuclides after a period of time t is given by $N = N_{o} exp (- γ t)$ where γ is known as the decay constant. Biology See decomposition.
随便看	humidification humidity humid mid-latitude morphoclimatic zone humid tropical morphoclimatic zone humid volume humification humiliation humilis humite hummingbird hummocky cross-bedding hummocky moraine hummocky terrain hum modulation humoral humour humours, doctrine of the four Humphreys series humus Hund coupling cases Hund, Friedrich (1896–1997) hundred Hundred Days (20 March–28 June 1815) Hundred Days Reform (1898) Hundred Flowers Movement (1956–57)