Alpha Model: A Mathematical Modeling Approach Applied to an Air Quality Monitoring Network

n this paper we apply the alpha Model to air quality prediction purposes. This model is used to predict the ground level ozone concentration which is influenced by multiple pollutants such as NO2, CO, Pb and particulate matter. The model was previously elaborated and successfully tested on other complex systems. Our main object here is to show that the alpha model is a powerful technique for analyzing performance complexities of implementing input-output relations. Air quality is taken as an example

Thermal bath effect on a left-handed three-level system

In this paper we consider a three level electromagnetically induced transparency atomic system under magneto-cross coupling effect. We investigate a theoretical study of the thermal bath effect on the electromagnetic properties of the system. We have shown that although the magneto-cross coupling effect induces chirality and enhances the ability to attain low absorption and negative refraction in left-handed media, the thermal bath has a considerable effect even at very low coupling strengths and causes the medium to lose its lefthanded properties

Soliton Propagation in a Left-handed Four-Level Atomic System

In this paper we analyze and discuss the solitons propagation in a left-handed four-level atomic system coupled to three laser fields. The system is analyzed through the density matrix formalism. We show that by varying the external probe field amplitude in time, the soliton propagation is obtained in the left-handed medium . Our scheme allows to engineer under certain conditions, the soliton propagation in the four- level atomic system while maintaining the negative refractive index

Nonmagnetic negative refractive index media based on chalcogenide glasses

We report in this work the study of the permittivity and the losses in non-linear nonmagnetic negative refractive index media. We analyze the permittivity and the losses dependence on the inclusion number of the particles used in the suggested media that is made by interlacing plasmonic metallic particles and a dielectric. We show that the exhibition of a negative permittivity in these strongly anisotropic media depends not only on the inclusion number of the particles and the frequency range but also on the oscillation frequency of free electrons in the metal which plays the major role. We finally suggest the use of supraconductor nanoparticles in the design of metal dielectric structures as a very promising route to create metamaterials, mainly in Chalcogenide glass as they provide low losses, high quality with non-linearity in fabrication

SLOWING LIGHT CONTROL FOR A SOLITON-PAIR

Abstract: We investigate the propagation of a soliton-pair in 3-level atomic system out of resonance. We present an explicit analytical expression of the soliton-pair shape. We show that the speed of the soliton-pair can be controlled. Furthermore, we derive a condition for completely stopping the light

SLOWING LIGHT CONTROL FOR A SOLITON-PAIR

Abstract: We investigate the propagation of a soliton-pair in 3-level atomic system out of resonance. We present an explicit analytical expression of the soliton-pair shape. We show that the speed of the soliton-pair can be controlled. Furthermore, we derive a condition for completely stopping the light

SLOWING LIGHT CONTROL FOR A SOLITON-PAIR

We investigate the propagation of a soliton-pair in 3-level atomic system out of resonance. We present an explicit analytical expression of the soliton-pair shape. We show that the speed of the soliton-pair can be controlled. Furthermore, we derive a condition for completely stopping the light

Soliton-pair Propagation under Thermal Bath Effect

We consider two atomic transitions excited by two variable laser fields in a three-level system. We study the soliton-pair propagation out of resonance and under thermal bath effect. We present general analytical implicit expression of the soliton-pair shape. Furthermore, we show that when the coupling to the environment exceeds a critical value, the soliton-pair propagation through three-level atomic system will be prohibited

Atomic population inversion in a two-level atom for shaped and chirped laser pulses: Exact solutions of Bloch equations with dephasing

We perform a theoretical analysis of the Bloch equations of a two-level atom with dephasing. Exact analytical solutions with two different chirped and time-dependent detuned laser pulses are derived. The atomic population inversion as well as the coherence are explored for different initial populations. We show that the stationary population inversion can be controlled