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Search Results: 1 - 10 of 452 matches for " Benattou;Mokhtar "
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Crack propagation under constant amplitude loading based on an energetic parameters and fractographic analysis
Benguediab, Mohamed;Bouchouicha, Benattou;Mokhtar, Zemri;Mazari, Mohamed;
Materials Research , 2012, DOI: 10.1590/S1516-14392012005000072
Abstract: the crack propagation behavior in a 2024 t351 aluminum alloy under constant amplitude loading has been studied. this study is complemented by quantitative microfractographic observations and energetic analysis. the obtained results under constant amplitude fatigue tests show that different crack propagation stages can be identified and correlated with the evolution of the characteristic features. in another hand, the energetic analysis shows that there is a discontinuous crack growth at low growth rates as against a cycle by cycle growth mechanism at high growth rates.
A Formal Model of Conformity and Security Testing of Inheritance for Object Oriented Constraint Programming  [PDF]
Khalid Benlhachmi, Mohammed Benattou
Journal of Information Security (JIS) , 2013, DOI: 10.4236/jis.2013.42013

This paper presents an approach for extending the constraint model defined for conformity testing of a given method of class to its overriding method in subclass using inheritance principle. The first objective of the proposed work is to find the relationship between the test model of an overriding method and its overridden method using the constraint propagation. In this context the approach shows that the test cases developed for testing an original method can be used for testing its overriding method in a subclass and then the number of test cases can be reduced considerably. The second objective is the use of invalid data which do not satisfy the precondition constraint and induce valid output values for introducing a new concept of test called secure testing. The implementation of this approach is based on a random generation of test data and analysis by formal proof.

Ternary Zero Correlation Zone Sequence Sets for Asynchronous DS-CDMA  [PDF]
Benattou Fassi, Ali Djebbari, Abdelmalik Taleb-Ahmed
Communications and Network (CN) , 2014, DOI: 10.4236/cn.2014.64023

In this paper we propose a new class of ternary Zero Correlation Zone (ZCZ) sequence sets based on binary ZCZ sequence sets construction. It is shown that the proposed ternary ZCZ sequence sets can reach the upper bound on the ZCZ sequences. The performance of the proposed sequences set in asynchronous Direct Sequence-Code Division Multiple Access (DS-CDMA) system is evaluated. In the simulation we used two types of channels: Additive White Gaussian Noise (AWGN) and frequency non-selective fading with AWGN noise. The proposed ternary ZCZ sequence sets show better results, in term of Bit Error Rate (BER), than Hayashi’s ternary ZCZ sequence sets.

Toward a Multi-Hop, Multi-Path Fault-Tolerant and Load Balancing Hierarchical Routing Protocol for Wireless Sensor Network  [PDF]
Mokhtar Beldjehem
Wireless Sensor Network (WSN) , 2013, DOI: 10.4236/wsn.2013.511025

This paper describes a novel energy-aware multi-hop cluster-based fault-tolerant load balancing hierarchical routing protocol for a self-organizing wireless sensor network (WSN), which takes into account the broadcast nature of radio. The main idea is using hierarchical fuzzy soft clusters enabling non-exclusive overlapping clusters, thus allowing partial multiple membership of a node to more than one cluster, whereby for each cluster the clusterhead (CH) takes in charge intra-cluster issues of aggregating the information from nodes members, and then collaborate and coordinate with its related overlapping area heads (OAHs), which are elected heuristically to ensure inter-clusters communication. This communication is implemented using an extended version of time-division multiple access (TDMA) allowing the allocation of several slots for a given node, and alternating the role of the clusterhead and its associated overlapping area heads. Each cluster head relays information to overlapping area heads which in turn each relays it to other associated cluster heads in related clusters, thus the information propagates gradually until it reaches the sink in a multi-hop fashion.

On Elliptic Problem with Singular Cylindrical Potential, a Concave Term, and Critical Caffarelli-Kohn-Nirenberg Exponent  [PDF]
Mohammed El Mokhtar Ould El Mokhtar
Applied Mathematics (AM) , 2015, DOI: 10.4236/am.2015.611166
Abstract: In this paper, we establish the existence of at least four distinct solutions to an elliptic problem with singular cylindrical potential, a concave term, and critical Caffarelli-Kohn-Nirenberg exponent, by using the Nehari manifold and mountain pass theorem.
Four Nontrivial Solutions for Kirchhoff Problems with Critical Potential, Critical Exponent and a Concave Term  [PDF]
Mohammed El Mokhtar Ould El Mokhtar
Applied Mathematics (AM) , 2015, DOI: 10.4236/am.2015.614198
Abstract: In this paper, we consider the existence of multiple solutions to the Kirchhoff problems with critical potential, critical exponent and a concave term. Our main tools are the Nehari manifold and mountain pass theorem.
Multiple Solutions to the Problem of Kirchhoff Type Involving the Critical Caffareli-Kohn-Niremberg Exponent, Concave Term and Sign-Changing Weights  [PDF]
Mohammed El Mokhtar Ould El Mokhtar
Applied Mathematics (AM) , 2017, DOI: 10.4236/am.2017.811123
In this paper, we establish the existence of at least four distinct solutions to an Kirchhoff type problems involving the critical Caffareli-Kohn-Niremberg exponent, concave term and sign-changing weights, by using the Nehari manifold and mountain pass theorem.
RETRACTED: Endotoxin Occurrence in Raw and Reclaimed Wastewater  [PDF]
Guizani Mokhtar, Funamizu Naoyuki
Journal of Water Resource and Protection (JWARP) , 2014, DOI: 10.4236/jwarp.2014.67066

Short Retraction Notice

The paper does not meet the standards of \"Journal of Water Resource and Protection\".

This article has been retracted to straighten the academic record. In making this decision the Editorial Board follows COPE's Retraction Guidelines. The aim is to promote the circulation of scientific research by offering an ideal research publication platform with due consideration of internationally accepted standards on publication ethics. The Editorial Board would like to extend its sincere apologies for any inconvenience this retraction may have caused.

Editor guiding this retraction: Prof. Dr. Jian Shen (EiC of JWARP).

The full retraction notice in PDF is preceding the original paper which is marked \"RETRACTED\".

The Phenological Stages of Apple Tree in the North Eastern of Iran  [PDF]
Mokhtar Karami, Mehdi Asadi
Computational Water, Energy, and Environmental Engineering (CWEEE) , 2017, DOI: 10.4236/cweee.2017.63018
The main objective of this study was to evaluate the process of parameters such as mean temperature; total precipitation on phenology and phenological stages of apple golden type in Razavi Khorasan. For this reason, long-term data of absolute minimum daily temperature, precipitation, humidity, as well as Digital Elevation Model (DEM) was used. After collecting data on phenology and Growing Degree Days (GDD) for golden apple, to pass each phenological stage at different growth stages, the start and end dates, phenological stages of the locations were identified. Then, regression equations with variable longitude, latitude and altitude on SPSS software at level of 50% and 95%, respectively were used, and finally phenological stages and spatial distribution maps of temperature and precipitation variables based on these equations were drawn in ARC GIS software. The analysis of the phenological stages showed that Torbate Heydarieh station has a decreasing trend which is significant at 1% in all stages of phenology and Ghoochan station does not show any significant increase or decrease trend at all stages of phenology.
Extracting the Atomic Coordinates and Connectivity of Zirconia Nanotubes from PDB Files for Modelling in ANSYS  [PDF]
Ibrahim D. Muhammad, Mokhtar Awang
Advances in Nanoparticles (ANP) , 2014, DOI: 10.4236/anp.2014.33013
Zirconia in the form of nanotubes has potential for application in various areas. However, information on structural and mechanical properties of zirconia nanotubes is not easily available and/ or limited in scope. This challenge requires multi-scale numerical modeling and simulation. As a way out, the structure of (10, 10) zirconia nanotube is modeled using available crystal and molecular software (Material Studio© and CrystalMaker©). The output in the form of PDB file is exported into ANSYS by using a script developed in Python. The output contains only the atomic coordinates and connectivity pattern, which make the conversion process faster and more efficient compared to manual option used when performing similar task.
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