نتایج جستجو برای: optical density ratios
تعداد نتایج: 772017 فیلتر نتایج به سال:
BACKGROUND Cataract, a leading cause of vision impairment, is due to the lens becoming excessively optically dense. Change in the lens optical density (LOD) could be a useful indicator of incipient nuclear cataract and would necessitate the development of accurate measurement techniques. Mapcat sf™ is a heterochromatic flicker photometer for measuring macular pigment optical density (MPOD) unde...
Optical to microwave clock frequency ratios with a nearly continuous strontium optical lattice clock
The London free-energy is regeneralized by the Ginsburg-Landau free-energy density in the presence of both d and s order parameters. We have shown that the strength of the s-d coupling, makes an important rule to determine the form of the lattice vortex. Appearance of the ratios of the coherence length to penetration depth in the higher order corrections of the free-energy density will trunca...
The nuclear level densities and level-density parameters in fissioning nuclei at their saddle points of fission barriers, ${a}_{f}$, as well those for neutron, ${a}_{n}$, proton, ${a}_{p}$, $\ensuremath{\alpha}$-particle, ${a}_{\ensuremath{\alpha}}$, emission residues the ground states are calculated isotopic chains superheavy with $Z$ = 112--120. calculations performed superfluid formalism usi...
We report a likely observation of cw lasing without inversion in a gas of hot rubidium atoms in an optical cavity under conditions of electromagnetically induced transparency EIT . The medium is pumped coherently and resonantly by a single “coupling” beam which also produces EIT in the lasing transition. The steady-state intensity exhibits thresholds as a function of the atomic density and the ...
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