- multifrequency probing
- многочастотное зондирование
English-russian dictionary of physics. 2013.
English-russian dictionary of physics. 2013.
Hydrogen line — For hydrogen lines in general, see Hydrogen spectral series. The hydrogen line, 21 centimeter line or HI line refers to the electromagnetic radiation spectral line that is created by a change in the energy state of neutral hydrogen atoms. This… … Wikipedia