In this letter the authors present a comprehensive study of the threshold current and its temperature dependence in GaAsSb-based quantum well edge-emitting lasers for emission at 1.3 m. It is found that at room temperature, the threshold current is dominated by nonradiative recombination accounting for more than 90% of the total threshold current density. From high hydrostatic pressure dependen...

This paper focuses on the link between economic rights and institutions. Simple analysis of data is used to demonstrate countries’ human development effort in advancing economics rights of the citizens. A country’s human development effort is evaluated on the basis of the well-being of the poorest members of the society. An analysis of data reveals that there is a wide variation in countries’ p...

The generation mechanism of self-sustained pulsation in vertical-cavity surface-emitting lasers (VCSEL’s) is analyzed with the influence of lateral loss effects, such as selffocusing, lateral diffraction loss, and spatial hole burning, taken into consideration. The condition for self-sustained pulsation is also derived in an analytical form. It is shown that the lateral loss effects have signif...

The effect of negative resistivity observed at anomalously low voltages in output characteristics of modulation-doped In0.53Ga0.47As/In0.52Al0.48As field-effect transistors is considered. In the discussed experiments, the threshold for appearance of negative resistivity depends not only on the gate length, which was mentioned before, but also on the gate–drain voltage. It is shown that the nega...

Anisotropic diffusion is posed as a process of minimizing an energy function. Its global convergence behavior is determined by the shape of the energy surface, and its local behavior is described by an orthogonal decomposition with the decomposition coefficients being the eigenvalues of the local energy function. A sufficient condition for its convergence to a global minimum is given and is ide...

We propose a solution to the problem of inferring the depth map, radiance and motion field of a scene from a collection of motion-blurred and defocused images. We model motion-blurred and defocused images as the solution of an anisotropic diffusion equation, whose initial conditions depend on the radiance and whose diffusion tensor encodes the shape of the scene, the motion field and the optics...

Let u ∈ BV(Ω) solve the total variation denoising problem with L-squared fidelity and data f . Caselles et al. [Multiscale Model. Simul. 6 (2008), 879–894] have shown the containment H(Ju \Jf ) = 0 of the jump set Ju of u in that of f . Their proof unfortunately depends heavily on the co-area formula, as do many results in this area, and as such is not directly extensible to higher-order, curva...