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Investigation of a New Waveguide Structure Based on Negative Index Material for Optoelectronic Applications

Optics and Photonics Journal 2017年第7期7卷 123-132页

作者： nour el houda hissi Bouchra Mokhtari Saida Bahsine noureddine Cherkaoui Eddeqaqi Mohammed Musa Shabat Physics Department Moulay Ismail University Meknes Morocco Physics Department Islamic University of Gaza Gaza Palestine

In this work, a waveguide structure consisting of a new artificial negative index material (NIM) surrounded by a nonlinear cover and a ferrite (YIG) substrate has been designed and investigated. We apply the boundary conditions and impose the condition of negative effective permeability of the ferrite slab to derive the dispersion relation related to the proposed structure. The NIM permittivity and permeability are not constant and depend on the operating frequency. The dispersion properties of the nonlinear electromagnetic surface waves (NEM) are analyzed and the associated propagation index is calculated. Results show that the dispersion could be tuned and controlled by selecting the NIM film thickness and the film-cover interface nonlinearity. The proposed structure is supporting unusual types of NEM surface waves having a non-reciprocal behavior widely used in designing optoelectronic devices.

关键词： Negative Index Material Nonlinearity Ferrite Substrate Waveguide Dispersion Relation Non-Reciprocal Behavior

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A Flocking-Based on Demand Routing Protocol for Unmanned Aerial Vehicles

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Journal of Computer Science & Technology 2018年第2期33卷 263-276页

作者： nour el houda Bahloul Saadi Boudjit Marwen Abdennebi Djallel Eddine Boubiche LaSTIC Laboratory University of Batna 2 Batna 05078 Algeria L2TI Laboratory University of Paris 13 Villetaneuse 93430 France

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 proposed a flocking-based 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. Moreover, an automatic ground base stations discovery mechanism has been introduced for a proactive drones and ground networks association needed for the context of real-time applications. The performance of BR-AODV was evaluated and compared with that of classical AODV routing protocol and the results show that BR-AODV outperforms AODV in terms of delay, throughput and packet loss.

关键词： unmanned aerial vehicle (UAV) AODV Boids of Reynolds mobility control

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A Comparative Study of Different Drying Processes for a Deformable Saturated Porous Medium

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Fluid Dynamics & Materials Processing 2023年第6期19卷 1339-1348页

作者： nour el houda Ben Mustaphaa Ibtissem Boumnijel M.el-Ganaoui Daoued Mihoubi Laboratory of Wind Energy Management and Waste Energy Recovery Research and Technology Center of EnergyHammam-LifTunisia Laboratory of Studies and Research on Wood Material(LERMAB) University of LorraineLongwyFrance National Engineering School of Monastir University of MonastirMonastirTunisia

Drying of a deformable saturated porous medium based on convective tempering is a novel method that can enhance energy efficiency and the quality of the dried product *** this experimental investigation,the performances of this specific technique are compared with those of a standard stationary drying process in terms of deformation,drying kinetics,moisture redistribution,and energy *** particular,the response of a deformable saturated porous medium(Kaolin)is *** results are critically discussed pointing out advantages and drawbacks.

关键词： Convective drying tempering convective drying energy consumption Kaolin

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