نتایج جستجو برای: population inversion
تعداد نتایج: 736537 فیلتر نتایج به سال:
Numerous efforts are underway to catalog genetic variation in human populations. While the majority of studies of genetic variation have focused on single base pair differences between individuals, i.e. single nucleotide polymorphisms (SNPs), several recent studies have demonstrated that larger scale structural variation including copy number polymorphisms and inversion polymorphisms are also c...
We study ultrafast excitonic population inversion resulting from the interaction of a semiconductor quantum dot (SQD) with localized surface plasmons. The plasmonic enhanced fields are generated when a metallic nanoparticle (MNP) is subject to a nonlinear chirped few-cycle pulse train. By numerically solving the time-dependent Bloch equations beyond the rotating-wave approximation, we show that...
[1] This paper introduces a Maximum Likelihood (ML) approach for estimating the statistical parameters required for the covariance matrices used in the solution of Bayesian inverse problems aimed at estimating surface fluxes of atmospheric trace gases. The method offers an objective methodology for populating the covariance matrices required in Bayesian inversions, thereby resulting in better e...
Cytogenetic observations on an extensive material of the Anopheles culicifacies complex from the Thenpennai river area, Tamil N adu, South India show that the populations are made up of four cytologically distinct species. Three of these, labeled A, B and C have already been described. A fourth .one, monomorphic for the inversion arrangement + a + b in the X chromosome and il + hI in the second...
We study the population inversion and Q-function of a two-level atom, interacting with single-mode laser light field, in a q-analog harmonic oscillator trap for increasing q. For τ = .003(q = e ) the collapses and revivals of popu∗email:[email protected] 1 lation inversion become well defined facilitating experimental observation but for large τ ∼ 0.1 the time dependence of populatio...
A first case of polymorphism of a pericentric inversion on X-chromosome was detected in six wild populations of Drosophila willistoni from islands and the mainland of Santa Catarina State, southern Brazil. The high representativeness of this inversion, with frequencies between 10 to 42 % in samples of wild populations from Santa Catarina State, suggests that it could be adaptive and that the es...
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