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Search Results: 1 - 10 of 205 matches for " Ayoub Rezqaoui "
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Effect of Chronic Aluminum Administration on Affective and Cognitive Behavior in Male and Female Rats  [PDF]
Oussama Zghari, Ayoub Rezqaoui, Sihame Ouakki, Mouloud Lamtai, Jihane Chaibat, Abdelhalem Mesfioui, Aboubaker El Hessni, El-Housseine Rifi, Azzouz Essamri, Ali Ouichou
Journal of Behavioral and Brain Science (JBBS) , 2018, DOI: 10.4236/jbbs.2018.84012
Abstract: In this study, we investigated the effect of chronic exposure of low doses of Aluminum on affective and cognitive disorders in male and female rats. Twenty-five rats for each gender are used and the treatment carried out for 8 weeks. Animals received distilled water for control or an intraperitoneal injection of different doses of Aluminum: 0.125, 0.25, 0.5 and 1 mg/kg. Behavioral performance is measured in various tests mainly the Open Field, Elevated Plus Maze, Force Swimming Test, Morris Water Maze, Y-maze and Object Recognition Test. Al exerts anxiogenic properties and depressive effect. The effect begins at 0.25 mg/kg to reach a maximum at 1 mg/kg. In addition, chronic exposure to Aluminum causes cognitive disorders characterized by affection of memory and influence spatial learning performance. The effect of Aluminum on working memory is effective just at 1 mg/kg, while the effect on spatial learning performance begins at 0.25 mg/kg to reach a maximum at 1 mg/kg. In conclusion, Aluminum enhances anxiety and depression parameters and cognitive disorders characterized by the affection of memory and spatial learning performance.
On Slide Mode Control of Chaotic Rikitake Two-Disk Dynamo—Chaotic Simulations of the Reversals of the Earth’s Magnetic Field  [PDF]
Ahmad Harb, Nabil Ayoub
International Journal of Modern Nonlinear Theory and Application (IJMNTA) , 2014, DOI: 10.4236/ijmnta.2014.33015

The modern nonlinear theory, bifurcation and chaos theory are used in this paper to analyze the dynamics of the Rikitake two-disk dynamo system. The mathematical model of the Rikitake system consists of three nonlinear differential equations, which found to be the same as the mathematical model of the well-known Lorenz system. The study showed that under certain value of control parameter, the system experiences a chaotic behaviour. The experienced chaotic oscillation may simulate the reversal of the Earth’s magnetic field. The main objective of this paper is to control the chaotic behaviour in Rikitake system. So, a nonlinear controller based on the slide mode control theory is designed. The study showed that the designed controller was so effective in controlling the unstable chaotic oscillations.

Role of Radiology in Infectious Diseases, HIV/AIDS Overview.
A Ayoub
Dar Es Salaam Medical Students' Journal , 2011,
Abstract: INTRODUCTION: Since the first case of HIV/AIDS appeared in USA and Africa more than two decades ago, the incidence of HIV/AIDS has continuously been increasing worldwide. It is estimated that 42 million people lived with HIV/AIDS in 2009 among whom 29.4 million (70%) were in Sub-Saharan Africa. Since there is no cure or vaccine presently available or in sight in near future, the current treatment strategy is to treat the opportunistic infections and HIV associated conditions. Developing countries account for about 60% of prevalence and 90% of new infections arise in the poor countries.2 In Africa the “worst case” scenario projections in the next 20 years are that: One quarter of the workforce will die, life expectancy will decrease from average of 63 to 47 years and 14 million children will be orphaned. OBJECTIVES: Emphasis on Diagnostic Imaging as the mainstay of management of patients with HIV/AIDS and related diseases. Demonstration of the role of radiology in the evaluation of patients, as guidance in interventional procedures such as drainages and biopsies as well as in the follow up of patients. Establishment of correct diagnosis of HIV associated conditions as they are very important so that patients can get appropriate treatment and less expenses are incurred during management. METHODOLOGY: This paper is a product of reviewing manuscripts and data available in journals,books and internet as stipulated in the reference section. The role of radiology in diagnosing and treating HIV/AIDS manifestations in each body system: HIV/AIDS spares no organ or system hence all radiological modalities have a role to play in the diagnosis and follow up of HIV/AIDS patients as is demonstrated in this imaging summary.
Heat Transfer Analysis of Different Types of Metal Hydrides in a Simple Geometric Storage Tank
Ayoub Kazim
Research Journal of Applied Sciences , 2012,
Abstract: In this study, a general 3-D steady state heat transfer analysis on a simple 1mX1mX1m hydrogen storage tank using different types of metal hydrides namely La0.95Nd0.05Ni5, LmNi(l) and Zr(Fe0.75Cr0.25)2 is carried out at hydrogen absorption rates of n=10-2 , n= 10-3 and n=10-4 mol/hr. The results demonstrated the significance of a higher absorption rate and reaction enthalpy of the metal hydride on the temperature distribution within the storage tank. Furthermore, a 12% and a negligible variation in the alloys temperature would occur if the changes in the thermal conductivity of hydrogen and convection coefficient are changed by 0.1 W/m C and 1 W m 2 C, respectively.
Determination of Combustion Parameters of a PEM Fuel Cell at Various Combustion Conditions
Ayoub Kazim
Journal of Engineering and Applied Sciences , 2012,
Abstract: This study evaluates the parameters that are associated with a combustion process of a Proton Exchange Membrane (PEM) fuel cell at various combustion conditions. Combustion parameters such as adiabatic flame temperature, air-fuel ratio, and fraction of water that condenses at 25 C and 1 atm, are considered in the analysis, which is performed at a theoretical air ratio ranging from 100 to 300% (from 0 to 200% excess air). Furthermore, exergy destruction associated with the combustion process was evaluated at each specified condition. The calculated results illustrated that the adiabatic flame temperature reached a maximum value of 2,526 K at 100% theoretical air and then reduced to 1,270 K at a theoretical air of 300%. Conversely, exergy destruction was evaluated to be 53,236 and 96,949 kJ kmol 1 at 100 and 300% of theoretical air, respectively.
Contes animaliers du Yémen
Houda Ayoub
Chroniques Yéménites , 2007,
Abstract: Patrimoine riche mais fragile, les contes yéménites sont l’objet d’un intérêt croissant de la part des chercheurs et des traducteurs, au Yémen comme en Europe. Fatima al-Baydan , qui a fondé en 2006 le centre M l Al-Dhahab (le Baton de Kohl ) pour la préservation du patrimoine oral de la mère et de l’enfant, a mené pendant une dizaine d’années un travail exceptionnel de collecte de contes, dans plusieurs gouvernorats du pays. L’atelier de traduction de l’école normale supérieure a rassemblé cinq contes brefs, issus de diverses régions, ayant tous pour personnages principaux des animaux. Animal Tales from YemenThe oral tales of Yemen are a very rich, but fragile heritage. They raise an increasing interest among the researchers and translators, in Yemen and abroad. Fatima al-Baydan , who created in 2006 the M l al-Dhahab ( the Kohl stick ) for the preservation of the oral litterature of the children and mothers, gathered an outstanding amount of tales in many governorates. The Ecole Normal Supérieure tranlation workshop (Paris) gathered five tales from various regions, which feature animals as main characters.
The Direct Extension Theorem
Ayoub Joseph
Mathematics , 2004,
Abstract: The problem of group extension can be divided into two sub-problems. The first is to find all the possible extensions of $H$ by $K$. The second is to find the different ways a group $G$ can arise as an extension of $H$ by $K$. Here we prove that the direct product $H\times K$ can arise as an extension of $H$ by $K$ in an essentially unique way: that is the direct extension. I would like to thank Yacine Dolivet for drawing my attention to the direct ``extension theorem'', and Anne-Marie Aubert as well as Charles-Antoine Louet for their support.
Nil 3-Armendariz Rings  [PDF]
Eltiyeb Ali, Ayoub Elshokry, Zhongkui Liu
Advances in Pure Mathematics (APM) , 2013, DOI: 10.4236/apm.2013.39096

We introduce nil 3-Armendariz rings, which are generalization of 3-Armendariz rings and nil Armendaiz rings and investigate their properties. We show that a ring R is nil 3-Armendariz ring if and only if for any \"\", Tn(R) is nil 3-Armendariz ring. Also we prove that a right Ore ring R is nil 3-Armendariz if and only if so is Q, where Q is the classical right quotient ring of R. With the help of this result, we can show that a commutative ring R is nil 3-Armendariz if and only if the total quotient ring of R is nil 3-Armendariz.

Automatic Arabic Document Classification Based on the HRWiTD Algorithm  [PDF]
Ehsan Othman, Ayoub Al-Hamadi
Journal of Software Engineering and Applications (JSEA) , 2018, DOI: 10.4236/jsea.2018.114011
Abstract: The documents contain a large amount of valuable knowledge on various subjects and, more recently, documents on the Internet are available from various sources. Therefore, automatic, rapid and accurate classification of these documents with less human interaction has become necessary. In this paper, we introduce a new algorithm called the highest repetition of words in a text document (HRWiTD) to classify the automatic Arabic text. The corpus is divided into a train set and a test set to be applied to proposed classification technique. The train set is analyzed for learning and the learning data is stored in the Learning Dataset file. The category that contains the highest repetition for each word is assigned as a category for the word in Learning Dataset file. This file includes non-duplicate words with the value of higher repetition and categories and they get from all texts in the train set. For each text in the test set, the category of words is assigned to a specific category by using Learning Dataset file. The category that contains the largest number of words is assigned as the predicted category of the text. To evaluate the classification accuracy of the HRWiTD algorithm, the confusion matrix method is used. The HRWiTD algorithm has been applied to convergent samples from six categories of Arabic news at SPA (Saudi Press Agency). As a result, the accuracy of the HRWiTD algorithm is 86.84%. In addition, we used the same corpus with the most popular machine learning algorithms which are C5.0, KNN, SVM, NB and C4.5, and their results of classification accuracy are 52.86%, 52.38%, 51.90%, 51.90% and 30%, respectively. Thus, the HRWiTD algorithm gives better classification accuracy compared to the most popular machine learning algorithms on the selected domain.
Optimizing Spectrum Trading in Cognitive Mesh Network Using Machine Learning
Ayoub Alsarhan,Anjali Agarwal
Journal of Electrical and Computer Engineering , 2012, DOI: 10.1155/2012/562615
Abstract: In a cognitive wireless mesh network, licensed users (primary users, PUs) may rent surplus spectrum to unlicensed users (secondary users, SUs) for getting some revenue. For such spectrum sharing paradigm, maximizing the revenue is the key objective of the PUs while that of the SUs is to meet their requirements. These complex contradicting objectives are embedded in our reinforcement learning (RL) model that is developed and implemented as shown in this paper. The objective function is defined as the net revenue gained by PUs from renting some of their spectrum. RL is used to extract the optimal control policy that maximizes the PUs’ profit continuously over time. The extracted policy is used by PUs to manage renting the spectrum to SUs and it helps PUs to adapt to the changing network conditions. Performance evaluation of the proposed spectrum trading approach shows that it is able to find the optimal size and price of spectrum for each primary user under different conditions. Moreover, the approach constitutes a framework for studying, synthesizing and optimizing other schemes. Another contribution is proposing a new distributed algorithm to manage spectrum sharing among PUs. In our scheme, PUs exchange channels dynamically based on the availability of neighbor’s idle channels. In our cooperative scheme, the objective of spectrum sharing is to maximize the total revenue and utilize spectrum efficiently. Compared to the poverty-line heuristic that does not consider the availability of unused spectrum, our scheme has the advantage of utilizing spectrum efficiently.
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