I learned that the old sunscreens protected us only from UVB, and that the new ones, while protecting against both parts of the ultraviolet radiation spectrum, still let some radiation through.
A radiator/absorber of this kind is called a blackbody, and its radiation spectrum is referred to as blackbody radiation, which depends on only one parameter, its temperature.
The measurable quantities in stellar astrophysics include the externally observable features of the stars: distance, temperature, radiation spectrum and luminosity, composition (of the outer layers), diameter, mass, and variability in any of these.
Thus signal communication, combining in itself the powers of photography, television, radar, and other instruments using the electromagnetic radiation spectrum, moved into such new areas of military electronics as battle area surveillance and electronic warfare devices to interfere with, or jam, enemy transmitters.
In the 20th century optical methods came to be applied extensively to regions of the electromagnetic radiation spectrum not visible to the eye, such as X-rays, ultraviolet, infrared, and microwave radio waves, and to this extent these regions are now often included in the general field of optics.
First, the radiation spectrum is converted to a time series.
Increases in greenhouse forcing inferred from the outgoing longwave radiation spectra of the Earth in 1970 and 1997.
The simulation of radiation spectra considerably facilitates the interpretation of experimental data.
Electrically driven thermal radiation spectra from single suspended carbon nanocoils (CNCs) were investigated.
Special emphasis will be placed on generating a simulated "flat" spectrum and blackbody radiation spectra in the 700 - 1070 nm range for the 800 - 1300 °C temperature interval.
Selective emitters׳ radiation spectra must be designed to match their accompanying photocell׳s band gap and simultaneously, withstand high temperatures (above 1000 K) for long operation times.
