PM10, PM2.5, precursor gas, and upper-air meteorological measurements were taken in Mexico of the city s particulate matter (PM). Average 24-hour PM10 concentrations over the period of study at the core sites in the city was 75 g/m 3. The 24-hour standard of 150 g/m 3 was exceeded for seven samples taken during the study period; the maximum 24-hour… (More)
This comment concerns the homogenization of 2D dielectric photonic crystals, and the fact that the limits k → 0 (k is the Bloch vector) and ε → +∞ do not commute for p-polarized waves (it is so for s-polarized waves, which is a straightforward case). This result has been claimed to be true by Nicorovici & al. in a series of paper [1–3] and it has been… (More)
The propagation of longitudinal acoustic waves in multilayer structures based on porous silicon and the experimental measurement of acoustic transmission for the structures in the gigahertz range are reported and studied theoretically. The considered structures exhibit band gaps in the transmission spectrum and these are localized modes inside the band gap,… (More)
The longwave phenomenological model is used to make simple and precise calculations of various physical quantities such as the vibrational energy density, the vibrational energy, the relative mechanical displacement, and the one-dimensional stress tensor of a porous silicon distributed Bragg reflector. From general principles such as invariance under time… (More)
: Theoretical demonstration and experimental evidence of photon Bloch oscillations and Wannier-Stark ladders (WSLs) in dual-periodical (DP) multilayers, based on porous silicon, are presented. An introduction of the linear gradient in refractive indices in DP structure, which is composed by stacking two different periodic substructures N times, resulted in… (More)
: In this work, we report the experimental results and theoretical analysis of strong localization of resonance transmission modes generated by hybrid periodic/quasiperiodic heterostructures (HHs) based on porous silicon. The HHs are formed by stacking a quasiperiodic Fibonacci (FN) substructure between two distributed Bragg reflectors (DBRs). FN… (More)
i iii v Osciladores RC Sinusoidais com AmpOps: Simulação e Realização Prática em Laboratório ……….. 1 13 Herramienta educacional para el diseño y configuración de redes de comunicaciones ….