An innovative solar cell based on a nanowire/quantum dot hybrid nanostructure array is designed and analyzed. By growing multilayer InAs quantum dots on the sidewalls of GaAs nanowires, not only the absorption spectrum of GaAs nanowires is extended by quantum dots but also the light absorption of quantum dots is dramatically enhanced due to the light-trapping effect of the nanowire array. By in...

A systematic study of a series InGaAs/GaAs lasers in the 1-1.3 μm optical range based on quantum wells (2D), dots (0D), and well-dots transitional (0D/2D) dimensionality is presented. In wide pump currents, dependences lasing wavelength layer gain constant, parameter which allows comparing with different types active region various waveguide designs, are measured analyzed. It shown that maximum...

Abstract We propose and justify an algorithm for producing Hermite- Padé polynomials of type I arbitrary tuple formal power series $[f_0,\dots,f_m]$?> , $m\geq1$?> about the point $z=0$?> ( $f_j\in\mathbb{C}[[z]]$?> ) under assumption that have a certain (‘general position’) nondegeneracy property. This is straightforward extension classical Viskovatov constructing (for $m=1$?> ...

We study structural, integral, differential, variational, and fractal properties of a function f whose argument $$ x={\Delta }_{\alpha_1{\alpha}_2\dots {\alpha}_n\dots}^{Q_s^{\ast }} is represented by polybasic s-symbol {Q}_s^{\ast } -representation (1 < s ∈ N) its corresponding value expressed as follows: f\left(x={\Delta }}\right)={a}^{\alpha_1{u}_1+{\alpha}_2{u}_2+\dots +{\alpha}_n{u}_n+\dot...

Thresholds were measured for detecting perturbations in a regular lattice of dots by modulating local dot density, local dot luminance, or some combination of the two. For high mean densities (dot spacing less than or equal to 15 min of arc), perturbations in local density increase the perceived brightnesses of the individually resolved elements in the more densely filled regions, and appear (a...

Semiconductor nanoparticles or quantum dots are being increasingly utilized as fluorescent probes in cell biology both in live and fixed cell assays. Quantum dots possess an immense potential for use in multiplexing assays that can be run on high content screening analysers. Depending on the nature of the biological target under investigation, experiments are frequently required on cells retain...

Tactile dots and bars serve as tactile landmarks so that people with visual impairment can use same consumer products as those used by sighted people. However, reliable age-related data on the appropriate sizes and the shapes was not necessarily available. The purpose of this study is to evaluate influences of edge radius of curvature of tactile dots and bars on their discriminability in younge...

Eu3+-modified carbon dots (C-dots), 3-5 nm in diameter, were prepared, functionalized, and stabilized via a one-pot polyol synthesis. The role of Eu2+/Eu3+, the influence of O₂ (oxidation) and H₂O (hydrolysis), as well as the impact of the heating procedure (conventional resistance heating and microwave (MW) heating) were explored. With the reducing conditions of the polyol at the elevated temp...

The objective of this study was to compare the costs and outcomes associated with guardian-supervised directly observed treatment relative to the standard of care Directly Observed Therapy, Short Course (DOTS) provided by community health workers (CHW). New cases of culture-positive pulmonary tuberculosis (TB) treated in Vitória, Espírito Santo State, Brazil, between January 2005 and December 2...

We investigate the optical emission and decay dynamics of excitons confined in large strain-free GaAs quantum dots grown by droplet epitaxy. From time-resolved measurements combined with a theoretical model we show that droplet-epitaxy quantum dots have a quantum efficiency of about 75% and an oscillator strength between 8 and 10. The quantum dots are found to be fully described by a model for ...