University Mohamed Khider of Biskra
Biskra, Algeria
Time filter
Source Type

Bitam S.,University Mohamed Khider of Biskra | Mellouk A.,University Paris Est Creteil
Journal of Network and Computer Applications | Year: 2013

A vehicular ad hoc network (VANET) is a subclass of mobile ad hoc networks, considered as one of the most important approach of intelligent transportation systems (ITS). It allows inter-vehicle communication in which their movement is restricted by a VANET mobility model and supported by some roadside base stations as fixed infrastructures. Multicasting provides different traffic information to a limited number of vehicle drivers by a parallel transmission. However, it represents a very important challenge in the application of vehicular ad hoc networks especially, in the case of the network scalability. In the applications of this sensitive field, it is very essential to transmit correct data anywhere and at any time. Consequently, the VANET routing protocols should be adapted appropriately and meet effectively the quality of service (QoS) requirements in an optimized multicast routing. In this paper, we propose a novel bee colony optimization algorithm called bees life algorithm (BLA) applied to solve the quality of service multicast routing problem (QoS-MRP) for vehicular ad hoc networks as NP-Complete problem with multiple constraints. It is considered as swarm-based algorithm which imitates closely the life of the colony. It follows the two important behaviors in the nature of bees which are the reproduction and the food foraging. BLA is applied to solve QoS-MRP with four objectives which are cost, delay, jitter, and bandwidth. It is also submitted to three constraints which are maximum allowed delay, maximum allowed jitter and minimum requested bandwidth. In order to evaluate the performance and the effectiveness of this realized proposal using C++ and integrated at the routing protocol level, a simulation study has been performed using the network simulator (NS2) based on a mobility model of VANET. The comparisons of the experimental results show that the proposed algorithm outperformed in an efficient way genetic algorithm (GA), bees algorithm (BA) and marriage in honey bees optimization (MBO) algorithm as state-of-the-art conventional metaheuristics applied to QoS-MRP problem with the same simulation parameters. © 2013 Published by Elsevier Ltd.

Guettala S.,Ziane Achour University of Djelfa | Mezghiche B.,University Mohamed Khider of Biskra
Construction and Building Materials | Year: 2011

This experimental work has focused on studying the possibility of using dune sand powder (DSP) as a part mass addition to Portland cement. Studying the effect of addition dune sand powder on development of compressive strength and hydration with age of cement pastes as a function of water/binder ratio, was varied, on the one hand, the percentage of the dune sand powder (physico-chemical and chemical effect) and on the other, the fineness of dune sand powder (physical effect). In order to understand better the chemical effect (pozzolanic effect) of dune sand powder in cement pastes, we followed the mixtures hydration (50% pure lime + 50% DSP) by X-ray diffraction. These mixtures pastes present a hydraulic setting which is due to the formation of a C-S-H phase (calcium silicate hydrate). The latter is semi-crystallized. This study is a simplified approach to that of the mixtures (80% ordinary Portland cement + 20% DSP), in which the main reaction is the fixing of the lime coming from the cement hydration in the presence of the dune sand powder (pozzolanic reaction), to form calcium silicate hydrate C-S-H semi-crystallized of second generation. The results proved that up to 20% of dune sand powder as Portland cement replacement could be used with a fineness of 4000 cm2/g without affecting adversely the compressive strength. The dune sand powder, despite its crystalline nature, presents a partial pozzolanic reactivity. © 2010 Elsevier Ltd. All rights reserved.

Bentrah H.,University Mohamed Khider of Biskra | Rahali Y.,University Mohamed Khider of Biskra | Chala A.,University Mohamed Khider of Biskra
Corrosion Science | Year: 2014

The inhibition effect of Gum Arabic (GA) on the corrosion of API 5L X42 pipeline steel in 1M HCl solution was investigated for the first time by electrochemical impedance spectroscopy and potentiodynamic polarization curves, the results show that GA is a good inhibitor in 1M HCl. The maximum percentage inhibition efficiency was found to be 92% at 2gL-1. The adsorption of GA on pipeline API 5L X42 steel surface obeys Langmuir adsorption isotherm, and involves physical adsorption. Polarization curves reveal that GA acts as a mixed-type inhibitor in hydrochloride acid. © 2014 Elsevier Ltd.

Achour B.,University Mohamed Khider of Biskra
Advanced Materials Research | Year: 2013

A new theory is presented to design pressurized conduits, particularly vaulted rectangular conduit. This theory is based on a referential rough conduit model characterized by an arbitrarily assigned relative roughness taken in the fully turbulence flow regime. Thus, the geometric elements of the chosen model are well defined. These allow a direct determination of the required geometric elements of the conduit by the use of a non-dimensional correction factor. A practical example is presented to explain the procedure of calculation. © (2013) Trans Tech Publications, Switzerland.

Abdeddaim S.,University Mohamed Khider of Biskra | Betka A.,University Mohamed Khider of Biskra
International Journal of Electrical Power and Energy Systems | Year: 2013

In the present paper, an optimal operation of a grid-connected variable speed wind turbine equipped with a Doubly Fed Induction Generator (DFIG) is presented. The proposed cascaded nonlinear controller is designed to perform two main objectives. In the outer loop, a maximum power point tracking (MPPT) algorithm based on fuzzy logic theory is designed to permanently extract the optimal aerodynamic energy, whereas in the inner loop, a second order sliding mode control (2-SM) is applied to achieve smooth regulation of both stator active and reactive powers quantities. The obtained simulation results show a permanent track of the MPP point regardless of the turbine power-speed slope moreover the proposed sliding mode control strategy presents attractive features such as chattering-free, compared to the conventional first order sliding technique (1-SM). © 2013 Elsevier Ltd. All rights reserved.

Mahboub C.,University Mohamed Khider of Biskra | Moummi N.,University Mohamed Khider of Biskra
Solar Energy | Year: 2012

In this paper, the top heat losses from a 60° vee corrugated solar collector with single glazing have been investigated. An approximate method for computation of glass cover temperature and top heat loss coefficient has been followed. A modified equation from Akhtar and Mullick's relation was proposed. The predicted values of the glass cover temperature and the top heat loss coefficient were compared with the results obtained by iterative solution of the energy balance equations over a wide range of operating conditions. A good accuracy is provided by the proposed equation which is recommended to be used in the energy analysis of the present configuration. © 2011 Elsevier Ltd.

Benramache S.,University Mohamed Khider of Biskra | Benhaoua B.,El - Oued University Center
Superlattices and Microstructures | Year: 2012

Transparent conducting indium doped zinc oxide was deposited on glass substrate by ultrasonic spray method. The In doped ZnO samples with indium concentration of 3 wt.% were deposited at 300, 350 and 400 °C with 2 min of deposition time. The effects of substrate temperature and annealing temperature on the structural, electrical and optical properties were examined. The DRX analyses indicated that In doped ZnO films have polycrystalline nature and hexagonal wurtzite structure with (0 0 2) preferential orientation and the maximum average crystallite size of ZnO: In before and annealed at 500 °C were 45.78 and 55.47 nm at a substrate temperature of 350 °C. The crystallinity of the thin films increased by increasing the substrate temperature up 350 °C, the crystallinity improved after annealing temperature at 500 °C. The film annealed at 500 °C and deposited at 350 °C show lower absorption within the visible wavelength region. The band gap energy increased from E g = 3.25 to 3.36 eV for without annealing and annealed films at 500 °C, respectively, indicating that the increase in the transition tail width. This is due to the increase in the electrical conductivity of the films after annealing temperature. © 2012 Elsevier Ltd. All rights reserved.

Achour B.,University Mohamed Khider of Biskra
Applied Mechanics and Materials | Year: 2014

The rough model method is successfully used to design a pressurized rectangular shaped conduit characterized by two linear dimensions. In this study, the focus is on the calculation of the horizontal linear dimension of the conduit. In a first step, the method is applied to a referential rough model in order to establish the relationships that govern its hydraulic characteristics. The obtained equations are of the third degree and are easily solved by trigonometric and hyperbolic functions. In a second step, these equations are used to easily deduce the linear dimension sought by introducing a non-dimensional correction factor. Practical example is taken to enable the hydraulic engineer to better understanding the advocated method and to observe the facility with which design of such a geometric profile can be performed. The calculation uses a strict minimum of data measurable in practice, in particular the absolute roughness. © (2014) Trans Tech Publications, Switzerland.

Achour B.,University Mohamed Khider of Biskra
Advanced Materials Research | Year: 2014

Normal depth plays a significant role in the design of open channels and in the analysis of the non-uniform flow as well. Currently, there is no analytical method for calculation of the normal depth in open channels, including the horseshoe profile. Current methods are either iterative or approximate. They also consider, unreasonably, Chezy's coefficient or Manning's roughness coefficient as a given data of the problem, despite the fact that these coefficients depend on the normal depth sought. In this study, a new analytical method is presented for calculating the normal depth in a horseshoe shaped tunnel. The method takes into account, in particular, the effect of the absolute roughness which is a readily measurable parameter in practice. In a first step, the method is applied to a referential rough model in order to establish the relationships that govern its hydraulic characteristics. In a second step, these equations are used to easily deduce the required normal depth by introducing a non-dimensional correction factor. A practical example is considered to better explain the advocated method and to appreciate its simplicity and efficiency. © (2014) Trans Tech Publications, Switzerland.

Achour B.,University Mohamed Khider of Biskra
Advanced Materials Research | Year: 2014

The recurring problem of calculating the normal depth in a trapezoidal open channel is easily solved by the rough model method. The Darcy-Weisbach relationship is applied to a referential rough model whose friction factor is arbitrarily chosen. This leads to establish the nondimensional normal depth relationship in the rough model. Through a non-dimensional correction factor of linear dimension, the aspect ratio and therefore normal depth in the studied channel is deduced. © (2014) Trans Tech Publications, Switzerland.

Loading University Mohamed Khider of Biskra collaborators
Loading University Mohamed Khider of Biskra collaborators