doublet


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Related to doublet: doublet antenna, doublet flow

doub·let

(dŭb'let),
1. A combination of two lenses designed to correct a chromatic and spheric aberration.
2. Synonym(s): dipole
3. Any sequence of two nucleotides in a polynucleotide strand.
4. A closely spaced pair of peaks or lines in a spectrum.

doub·let

(dŭb'lĕt)
1. A combination of two lenses designed to correct chromatic and spheric aberration.
2. Synonym(s): dipole.
3. Any sequence of two nucleotides in a polynucleotide strand.
4. A closely spaced pair of peaks or lines in a spectrum.
5. Text repeated in a printed document.

doublet

A combination of two lenses usually cemented to each other used to correct chromatic aberration. Typically it consists of a positive crown lens and a negative flint lens. See achromatizing lens; triplet.
References in periodicals archive ?
Extra sources of t[bar.t] events from what we expect from standard model can appear from theories beyond standard model such as two Higgs doublet models.
In Table 2 is shown the valence electronic configuration of the lowest-lying quadruplet and doublet states of the radical fragments that differ only in the spin of the unpaired parallel electrons located on the nonmetallic fragment.
Twenty-six sections were used from the 7 explants/group, and the total number of nuclei counted was 209 (N), 268 (AGEs), 245 (NT-4), 212 (citicoline), 223 (TUDCA), 198 (doublet), and 223 (triplet) media.
This spectrum was fitted by tree doublets. The fitting parameters in the spectrum are listed in Table 2.
34 (1H, singlet, N-H ), 7.50 (2H, d, J=8.4 Hz, H-2'/H-6'), 7.37 (2H, doublet, J=8.4 Hz, H-3'/H-5'), 5.66(2H, singlet, H-1''/H-3''), 4.74 (1H, singlet, H-5''), 4.34 (1H, singlet, H-4), 4.51 (2H, singlet , H-7), 3.42-3.34 (2H, multiplet, H-2 a /H-6 a), 2.75-2.62 (2H, multiplet, H-2ss /H-6ss ), 2.22-2.12 (2H, multiplet, H- 3 a /H-5 a ),1.97-1.91 (2H, multiplet, H-3 ss /H-5 ss).
where the first (-[e.sub.*]) belongs to the electron and the second to the negative branch of the PV charge doublet. The corresponding positron equation of motion is then obtained from the charge conjugation of (9)
"We were really looking forward to the coat and doublet returning to us", said Julie Hawthorn, house and collections manager at Seaton Delaval Hall.
"So far, 65 people have been arrested as part of Operation Doublet and the investigation continues.
The sperm flagella deprived of the plasma membrane and the mitochondria were disintegrated by sliding between the doublet microtubules with Mg[ATP.sup.2-].
He christened it "Doublet" for "double tokamak" and built a very small one with company funds.
Excitation for the biexciton system is in a closed-loop four-level scheme shown in Figure 1, where the ground state |g> is coupled in a V-type structure to intermediate exciton doublet states |x> and |y>, which are themselves coupled to a common excited biexciton state |b> in a A-type structure.
The most common type is the achromatic doublet based on two individual lenses, one crown glass lens element and a flint glass lens element, joined together, usually one positive and the other negative, so the aberrations and dispersion effects of one lens are compensated by those of the other 1].