High Institute of Applied Sciences and Technology

Hammam Sousse, Tunisia

High Institute of Applied Sciences and Technology

Hammam Sousse, Tunisia
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Ma Q.,High Institute of Applied Sciences and Technology
Qiangjiguang Yu Lizishu/High Power Laser and Particle Beams | Year: 2015

Based on the advantages of the relativistic backward wave oscillator (RBWO) with low magnetic field and vircator, a novel configuration of vircator with a high beam-wave conversion efficiency is presented and the 2.5-D particle-in-cell simulations are carried out using a PIC code. When the energy of the electron is 480 keV while the beam current is 23 kA, a simulated result of 2.6 GW output microwave power with a frequency of 3.7 GHz is obtained, for which the beam-wave conversion efficiency of the vircator is 23%. ©, 2015, Editorial Office of High Power Laser and Particle Beams. All right reserved.


Ajouli A.,High Institute of Applied Sciences and Technology
Proceedings - 41st Euromicro Conference on Software Engineering and Advanced Applications, SEAA 2015 | Year: 2015

Softwares evolve and continue to change during their life cycle in order to satisfy new requirements. Such evolution has a cost which depends on the degree of maintenance complexity and modules dependencies. Many software structures such as design patterns represented solutions to make maintenance being modular and not transverse, but each one of these structures corresponds to a specific case of maintenance task. In this paper, we propose a so called Shadow structure for performing modular evolutions of Java program methods implementations. We give specification of this structure and we show how to implement it in Java programs. We discuss its effectiveness in facilitating maintenance and increasing cohesion. © 2015 IEEE.


Jemai K.,High Institute of Applied Sciences and Technology
Journal of Intelligent and Fuzzy Systems | Year: 2016

In this article, we have an interested implementing new intelligent strategies based on fuzzy controllers, for a better integration of renewable energy in the powerful electrical networks, commonly called super grids. A preliminary investigation has allowed us to learn more about the impact of this integration on algebraic variables of an electrical network on one hand and on the modes of operation of power plants on the other. Indeed, if necessary to ensure the strategic balance production and consumption, especially during peak hours, power operators shall ensure that the integration of one or more wind farms does not affect any aspect of the quality Energy distributed to subscribers. Perfect stability of large power grids at times of integration of renewable energy sources is ensured through the use of new strategies constituting a potential support which acts to overcome the hazards may hinder the operation of the components basic of these grids. © 2016 - IOS Press and the authors.


Bouabid M.,Gabes University | Magherbi M.,High Institute of Applied Sciences and Technology | Hidouri N.,Gabes University | Brahim A.B.,Gabes University
Entropy | Year: 2011

Natural convection in an inclined rectangular cavity filled with air is numerically investigated. The cavity is heated and cooled along the active walls whereas the two other walls of the cavity are adiabatic. Entropy generation due to heat transfer and fluid friction has been determined in transient state for laminar natural convection by solving numerically: the continuity, momentum and energy equations, using a Control Volume Finite Element Method. The structure of the studied flows depends on four dimensionless parameters which are: the thermal Grashof number, the inclination angle, the irreversibility distribution ratio and the aspect ratio of the cavity. The obtained results show that entropy generation tends towards asymptotic values for lower thermal Grashof number values, whereas it takes an oscillative behavior for higher values of thermal Grashof number. Transient entropy generation increases towards a maximum value, then decreases asymptotically to a constant value that depends on aspect ratio of the enclosure. Entropy generation increases with the increase of thermal Grashof number, irreversibility distribution ratio and aspect ratio of the cavity. Bejan number is used to measure the predominance of either thermal or viscous irreversibility. At local level, irreversibility charts show that entropy generation is mainly localized on bottom corner of the left heated wall and upper corner of the right cooled wall. © 2011 by the authors; licensee MDPI, Basel, Switzerland.


Rhif A.,High Institute of Applied Sciences and Technology
IETE Technical Review (Institution of Electronics and Telecommunication Engineers, India) | Year: 2011

A new autonomous underwater vehicle (AUV) called H160 is described in this article. The first prototype of this AUV has been realized through collaboration between two partners, which are the Laboratory of Data processing, Robotics and Micro electronic of Montpellier (LIRMM) and the ECA-HYTEC (specialist in the design and manufacture of remote controlled systems in "hostile" environments). This paper shows a general presentation of the vehicle, its hardware and software architecture including the process modeling and the control law used. Simulation results presented are based on the AUV mathematical model.


Rhif A.,High Institute of Applied Sciences and Technology
IETE Technical Review (Institution of Electronics and Telecommunication Engineers, India) | Year: 2011

The Sun Tracker is an automated solar panel that actually follows the sun position to increase the power production. After some measurements, the Sun Tracker increases the power production by more than 40% by keeping the panels parallel to the sun that makes the sun rays fall perpendicularly on the solar panel. In this paper, we present a sun tracker without using sun sensors. The sun tracking is performed by changing the solar panel orientation in horizontal and vertical directions by two motors. The control of these motors is ensured by a microcontroller. The proposed system has the capability to track using the location data of the sun.


Mchirgui A.,Gabes University | Hidouri N.,Gabes University | Brahim A.B.,Gabes University | Magherbi M.,High Institute of Applied Sciences and Technology
Transport in Porous Media | Year: 2012

The article reports a numerical study of entropy generation in double-diffusive convection through a square porous cavity saturated with a binary perfect gas mixture and submitted to horizontal thermal and concentration gradients. The analysis is performed using Darcy-Brinkman formulation with the Boussinesq approximation. The set of coupled equations of mass, momentum, energy and species conservation are solved using the control volume finite-element method. Effects of the Darcy number, the porosity and the thermal porous Rayleigh number on entropy generation are studied. It was found that entropy generation considerably depends on the Darcy number. Porosity induces the increase of entropy generation, especially at higher values of thermal porous Rayleigh number. © 2012 Springer Science+Business Media B.V.


Ma Q.,High Institute of Applied Sciences and Technology
Qiangjiguang Yu Lizishu/High Power Laser and Particle Beams | Year: 2014

Based on the working principle of the backward wave oscillator (BWO) with a low magnetic field, a frequency-agile relativistic backward wave oscillator (RBWO), whose frequency can be counterchanged between X band and C band by changing the strength of the guiding magnetic field, is designed. To actualize frequency's agile counterchange, two sections of slow wave structure (SWS), whose appeals on parameters of electron beams are accordant, are linked. When the energy of the electron is 670 keV while the beam current is 8 kA, the simulated result of 1.0 GW output microwave power with 6.28 GHz frequency is obtained on conduction of 0.5 T guiding magnetic field, while 0.75 GW output microwave power with 9.26 GHz frequency is obtained on conduction of 0.8 T guiding magnetic field. ©, 2014, Editorial Office of High Power Laser and Particle Beams. All right reserved.


Trabelsi R.,High Institute of Applied Sciences and Technology | Trabelsi R.,University of Monastir | Khedher A.,National School of Technology | Mimouni M.F.,University of Monastir | M'Sahli F.,University of Monastir
Electric Power Systems Research | Year: 2012

This paper deals with the synthesis of a speed and flux control strategy for an induction motor drive based on an output feedback adaptive backstepping controller. The proposed strategy is asymptotically stable in the context of Lyapunov theory. The adaptive backstepping method takes into account the nonlinearities of the system in the design control law. The unavailable rotor flux is recovered by using an adaptive sliding rotor-flux observer provided with an adaptive mechanism of rotor resistance. Simulated and experimental results on a 1.5-kW squirrel-cage induction motor drive are displayed to validate the feasibility and the effectiveness of the proposed strategy. © 2012 Elsevier B.V. All rights reserved.


Zidi Z.S.,High Institute of Applied Sciences and Technology
Journal of Chemical Physics | Year: 2012

The formation of water clusters on Li, Na, K, Cl -, and I - ions from water vapor at atmospheric conditions have been studied using Monte Carlo simulations. The extended simple point charge model has been employed for water molecules. The polarization of ions in the field of molecules and the polarization of molecules in the field of ions have been considered explicitly in the total Hamiltonian of the molecular system. The cluster formation work and the Gibbs free energy and enthalpy of attachment reactions of one water molecule to the cluster have been calculated via the bicanonical ensemble method. Our results reveal the formation of stable clusters in equilibrium with the moist atmosphere in a wide range of vapor pressure values, with largest clusters are formed around cations. Decreasing the temperature, from 293 K to 253 K, leads to the formation of larger equilibrium clusters, and enhances the stability of systems as whole. According to clusters' molecular structures, negative ions are expected to be more active in atmospheric processes, including chemical reactions and cloud formation, than positive ones. © 2012 American Institute of Physics.

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