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What (who) is selective absorber - definition
ORDINARY SURFACES RE-RADIATE HEAT THEY ABSORB. SELECTIVE ONES RE-RADIATE ONLY A LITTLE.
Selective absorber
Selective auditory attention
THE FOCUS ON A SPECIFIC SOURCE OF A SOUND OR SPOKEN WORDS
Selective hearing; Selective deafness; User:Spicysugar07/Selective Auditory Attention; Wikipedia talk:Articles for creation/Selective Auditory Attention; Selective Auditory Attention
Selective auditory attention or selective hearing is a type of selective attention and involves the auditory system. Selective hearing is characterized as the action in which people focus their attention intentionally on a specific source of a sound or spoken words.
selective service
![military segregated]].](https://commons.wikimedia.org/wiki/Special:FilePath/King, Stoddard WW1 draft card.jpg?width=200 "military segregated]].")
.svg?width=200 "The former seal of the Selective Service System")
![Selective service information available in a local post office in [[Boston, Massachusetts]]](https://commons.wikimedia.org/wiki/Special:FilePath/Selective service information.jpg?width=200 "Selective service information available in a local post office in [[Boston, Massachusetts]]")
.jpg?width=200 "100px")
US FEDERAL GOVERNMENT AGENCY THAT MAINTAINS INFORMATION ON THOSE POTENTIALLY SUBJECT TO MILITARY CONSCRIPTION
Selective Service; 3-A deferment; Selective service; Class 1-A; 4F (military conscription); U.S. Selective Service; 4-F (US Military); Military deferment; Student deferment; Selective Service Administration; Selective Service Board; 4-F (Selective Service System); Class 1-Y; Selective Service registration; Selective Service Number; Selective Service System classification; Selective Service Draft Act; Director of Selective Service; D.S.S. Form 1
In the United States, selective service is a system of selecting and ordering young men to serve in the armed forces for a limited period of time.
N-UNCOUNT
selective service
US FEDERAL GOVERNMENT AGENCY THAT MAINTAINS INFORMATION ON THOSE POTENTIALLY SUBJECT TO MILITARY CONSCRIPTION
Selective Service; 3-A deferment; Selective service; Class 1-A; 4F (military conscription); U.S. Selective Service; 4-F (US Military); Military deferment; Student deferment; Selective Service Administration; Selective Service Board; 4-F (Selective Service System); Class 1-Y; Selective Service registration; Selective Service Number; Selective Service System classification; Selective Service Draft Act; Director of Selective Service; D.S.S. Form 1
¦ noun N. Amer. service in the armed forces under conscription.
Wikipedia
Selective surface
In solar thermal collectors, a selective surface or selective absorber is a means of increasing its operation temperature and/or efficiency. The selectivity is defined as the ratio of solar radiation absorption (αsol) to thermal infrared radiation emission (εtherm).
Selective surfaces take advantage of the differing wavelengths of incident solar radiation and the emissive radiation from the absorbing surface:
- Solar radiation covers approximately the wavelengths 350 nm to 4000 nm; UV-A, visible and near infrared (NIR, or IR-A plus IR-B).
- Thermal infrared radiation, from materials with temperatures approximately in the interval -40 to 100 °C, covers approximately the wavelengths 4000 nm to 40,000 nm = 4 um to 40 um; The thermal infrared radiation interval being named or covered by: MIR, LWIR or IR-C.
