The interest shown by some community of researchers to autonomous drones or UAVs (Unmanned Aerial Vehicles) has increased with the advent of wireless communication networks. These networks allow UAVs to cooperate more efficiently in an ad hoc manner in order to achieve specific tasks in specific environments. To do so, each drone navigates autonomously while staying connected with other nodes in its group via radio links. This connectivity can deliberately be maintained for a while constraining the mobility of the drones. This will be suitable for the drones involved in a given path of a given transmission between a source and a destination. This constraint could be removed at the end of the transmission process and the mobility of each concerned drone becomes again independent from the others. In this work, we have proposed a bio-inspired routing protocol for UAVs called BR- AODV. The protocol takes advantage of a well known ad hoc routing protocol for on-demand route computation, and the Boids of Reynolds mechanism for connectivity and route maintaining while data is being transmitted. The performances of BR-AODV were evaluated and compared to those of classical AODV routing protocol and the results show that BR-AODV outperforms AODV in terms of delay, throughput and packet loss.

Boron Phosphorus and Arsenic atoms used as doping for the polysilicon gate they can cause crucial problem of metal-oxide- Semiconductor (MOS) devices. In this work, in order to improve the electrical parameters of MOS transistor such as, threshold voltage and flat band voltage, we have simulated Boron, Phosphorus and Arsenic Diffusion profiles in three dimensions in a polysilicon layer using the simulator Athena based on Pearson type IV models. We have study profile of dopant in 3-D before and after thermal annealing in a highly doped polysilicon film. The model takes into account the distribution of vacancy mechanism by associating parameters and effects related to high concentrations, such as the formation of clusters by trapping and exceeding the solid solubility limit. Based on the literature the model is solved under windows seven, following a well-defined algorithm. also We have studied the influence of some parameters, like concentration, temperature, time, dose and energy on implantation profiles of Boron, Phosphorus and Arsenic. The results have analyzed and discussed in order to extract depth of doping (Phosphorus Arsenic and boron) and it has been able to optimize the silicon oxide thickness, to reduce the penetration of doping. This theoretical analyses show that technological conditions preserve the quality of the silicon oxide structure studied. The model is validated with the help of simulation results obtained from Matlab

The purpose of this paper is to improve data gathering from oilfield wells (GEA: Gassi El Agreb oilfield case study) by the integration of deported autonomous flowmeters installed on these wells in a DCS control system. Indeed, oil and gas industry is very much linked to technological progress of electronics and informatics; this has allowed a considerable evolution of production processes control. This evolution is translated by process control techniques change: from pneumatic systems to electronic systems, from analog to digital ones and then from centralized control to distributed one which we commonly call DCS (Distributed Control System).

This paper, present the resonant and the radiation characteristics of superconducting rectangular microstrip antenna printed on uniaxailly anisotropic substrate using an electromagnetic approach based on cavity model in conjunction with electromagnetic knowledge. The cavity model combined with London's equations and the Gorter-Casimir two-fluid model has been improved to investigate the resonant characteristics as well as the radiation patterns of high Tc superconducting rectangular microstrip patch in the case where the patch is printed on uniaxially anisotropic substrate materials. The most advantage of our extended model include low computational cost and mathematical simplify. The numerical simulation of this modeling shows excellent agreement with experimental results available in the literature. Finally, radiation patterns of superconducting rectangular patch on anisotropic substrate are also presented.

Dans le présent document, nous nous intéressons aux cellules photovoltaïques en présentant un tour d'horizon sur ces dispositifs électroniques depuis la couche active, constituant le milieu absorbeur, jusqu'à leur association dans des modules pour fournir l'énergie requise par une installation. En premier lieu, nous donnons un bref survol des aspects généraux et du vocabulaire de base utilisés dans ce domaine, puis nous abordons le volet concernant les matériaux et la conversion photovoltaïques ainsi que les technologies retenues pour réaliser ces cellules. En second lieu, nous présentons les techniques de caractérisation utilisées pour contrôler la qualité des cellules réalisées ainsi que leur association en modules pour pouvoir générer des tensions et des courants utilisables en pratique. Pour finir, nous donnons quelques résultats récents et les prévisions d'une feuille de route proposée dans ce domaine