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The hydrostatic pressure influence on the binding energy and on the optical properties (linear and third nonlinear) associated to the 1s−1p intersubband transition of single dopant in a AlAs/GaAs spherical core/shell structure is investigated. The combined effects of the problem variables such as the core and shell sizes, the donor position in the structure and the pressure dependence of the physical...
Linear, third-order nonlinear and total optical absorption coefficients associated with intra-conduction band in wurtzite unstrained (In,Ga)N-GaN coupled quantum wells are calculated. Based on the effective-mass and the one-band parabolic approximations, the well and the barrier-widths effects are investigated variationally under finite confinement potential barrier. The results indicate that the...
Most of current cellular networks are designed for transmitting packet data and voice services. Several types of traffic such as voice, WAP, Web, FTP and E-mail with different ON/OFF distributions have to be supported by these networks. It is therefore important to know their performance in such systems. In this paper we develop a performance analytical model which takes into account the different...
This paper presents the recent results of SCA project (communication systems for avionics), on the evaluation of the means of communication able to ensure airlines companies needs on airport platforms. Exchange of AOC/AAC (aeronautical operational control/aeronautical administrative communication) messages between aircrafts and their airline companies is required on the ground. The concept of technology...
The approach presented in this work aims to guide the companies in their design of requirements traceability models adapted to the context of their projects. This is achieved by allowing the construction of a model based on trace fragments adapted to each phase of the development process or to a specific situation. Furthermore, the approach guides the users to use the traceability model in a requirement...
The approach presented in this work aims to guide the companies in their design of requirements traceability models adapted to the context of their projects. This is achieved by allowing the construction of a model based on trace fragments adapted to each phase of the development process or to a specific situation. Furthermore, the approach guides the users to use the traceability model in a requirement...
Future wireless communication systems are intended to offer multimedia services to a large number of subscribers at the same time. The MC-CDMA technique has recently gained considerable attention for many future communication systems due to its ability to support high rates while ameliorating ISI and channel propagation effects. This paper investigates the performance analysis and simulation of a...
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