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OALib Journal期刊

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Effect of Cadmium Repartition on Nitrogen Metabolism in Tobacco Seedlings  [PDF]
Houda Maaroufi Dguimi, Khulud Alshehri, Chokri Zaghdoud, Ali Khalaf Albaggar, Mohamed Debouba
Open Access Library Journal (OALib Journal) , 2019, DOI: 10.4236/oalib.1104000
Abstract:
Thirty-day-old tobacco seedlings (Nicotiana tabaccum, Bureley v) were subjected during one week to increasing cadmium (Cd) concentrations (0, 10, 20, 50 and 100 μM CdCl2). Increasing Cd stress led to a gradual decrease of dry weight (DW) production, water and nitrate contents. More than the half of Cd accumulated per plant was sequestered in the oldest leaf stage (S1 leaves). Leaves from S1 were the least affected by Cd stress. The activities of nitrate reductase (NR, EC 1.6.1.6), nitrite reductase (NiR, EC 1.7.7.1) were the least reduced in S1 leaves despite of the high presence of Cd ions. At 100 μM Cd, glutamine synthetase activity (GS, EC 6.3.1.2) from S1 leaves rose to become 2 times more important than control. Western Blot analysis showed that S1 GS activity induction was correlated to the GS1 and GS2 protein accumulation. Young leaves (S3 leaves) were more affected by Cd stress than old leaves. The GS activity reduction in S3 leaves was correlated to GS2 protein decrease detected by western-blot analysis. So, tobacco plant accumulated Cd ions in old leaves (S1 leaves) to protect younger leaves which are more sensitive to Cd effects. Leaves from S1 are a target organ to verify an eventual soil contamination per cadmium. This leaves may evolve adaptive process to partially inactivate Cd ions and maintain stable rate of nitrogen metabolism.
Survey of Uncertainty Handling in Cloud Service Discovery and Composition
Nouha Khédiri,Montaceur Zaghdoud
Computer Science , 2015,
Abstract: With the spread of services related to cloud environment, it is tiresome and time consuming for users to look for the appropriate service that meet with their needs. Therefore, finding a valid and reliable service is essential. However, in case a single cloud service cannot fulfil every user requirements, a composition of cloud services is needed. In addition, the need to treat uncertainty in cloud service discovery and composition induces a lot of concerns in order to minimize the risk. Risk includes some sort of either loss or damage which is possible to be received by a target (i.e., the environment, cloud providers or customers). In this paper, we will focus on the uncertainty application for cloud service discovery and composition. A set of existing approaches in literature are reviewed and categorized according to the risk modeling.
La philosophie entre survie et persécution dans Hayy Ibn Yaqdhan d’Ibn Tufayl 1 et printemps arabe
Chokri Mimouni
Synergies Monde Arabe , 2011,
Abstract: Il s’agit de rendre hommage à tous les mouvements pacifiques qui ont su faire face aux pires tyrannies à travers monde. Qu’il s’agisse des philosophes du Moyen-age ou de la jeunesse arabe actuelle, c’est d’un commun accord de révolte pour la dignité et pour la liberté de penser. Armés du seul libre pensé, ils ont su déstabiliser les lois de la pensée unique qui a battu sa tente dans le monde arabe depuis fort longtemps. Ibn Tufayl, philosophe du XIIème siècle, dont l’ouvrage a suscité l’intérêt des plus grands esprits des siècles des lumières, tel que Spinoza, J.J. Rousseau et autres, nous a laissé une uvre magistrale dans laquelle seul l’esprit humain est porté au sommet de la gloire. Les artisans de la “révolution du jasmin ont fait en sorte que l’exhalaison de leur mouvement embaume le monde entier par la fraicheur de leur esprit, avec un art et une manière exemplaires. Un rapprochement était donc inévitable pour montrer que l’esprit arabe a toujours été animé par un idéal de sagesse pr nant une philosophie de vie qui va avec l’intérêt de l’homme, contre toute forme d’oppression.
Traduction du texte religieux : créativité littéraire et persécution
Chokri Mimouni
DOCT-US , 2011,
Abstract: The way of the translation is, generally speaking, very thorny, difficult to access and leading nowhere not to say impossible. Impossibility not only bound to the distrust which we have towards the translator but also strictly bound to the nature of the task, especially when it is about the translation of a religious text and in this case about the Koran. Besides the linguistic correspondence and cultural of the text, there are, in fact, so many other factors to be considered: the history of the text, its impact at the time of its appearance on the individuals, even on the whole peoples, its impact on the cultural and religious life in the middle age. The orientation stemming from the translation would be blocked not at all, therefore, in front of expectations of the individuals whom addresses the translation and show the influence whether the translation, however small it is, can have on the reaction of these same persons.
On the L^p-theory of Anisotropic singular perturbations of elliptic problems
Chokri Ogabi
Mathematics , 2015,
Abstract: In this article we give an extention of the L^2-theory of anisotropic singular perturbations for elliptic problems. We study a linear and some nonlinear problems involving L^p data (1
Weighted function spaces and Dunkl transform
Chokri Abdelkefi
Mathematics , 2010,
Abstract: We introduce first weighted function spaces on Rd using the Dunkl convolution that we call Besov-Dunkl spaces. We provide characterizations of these spaces by decomposition of functions. Next we obtain in the real line and in radial case on Rd weighted Lp-estimates of the Dunkl transform of a function in terms of an integral modulus of continuity which gives a quantitative form of the Riemann-Lebesgue lemma. Finally, we show in both cases that the Dunkl transform of a function is in L1 when this function belongs to a suitable Besov-Dunkl space.
On a class of nonlinear elliptic, anisotropic singular perturbations problems
Ogabi Chokri
Mathematics , 2014,
Abstract: In this article we study the asymptotic behavior, of the solution of a nonlinear elliptic, anisotropic singular perturbations problem in cylindrical domain, the limit problem is given and strong convergences are proved, we also give an application to intergo-differential problems.
An Experimental Analysis of Over-Confidence  [PDF]
Saoussen Jemaiel, Chokri Mamoghli, Mohamed Walid Seddiki
American Journal of Industrial and Business Management (AJIBM) , 2013, DOI: 10.4236/ajibm.2013.34047
Abstract:

The purpose of this paper is to experimentally demonstrate the existence of the bias of over-confidence as a human psychological bias. This bias was measured by three methods: the estimation interval, the frequency estimation method and the method of question with two answer choices. The estimation interval method finds a very wide bias compared to the other two methods, but overconfidence persists in the other two methods at lower levels. In the first experiment, monetary incentives have exacerbated the over-confidence because of the given compensation. This system has demonstrated that there is a strong link between over-confidence and risk taking. The second experiment that used the method of question with two answer choices was given a different pay system and it was expected that overconfidence will be reduced by monetary incentives but the results show that the bias is not significantly reduced by these new monetary incentives. Similarly, the iteration that was made during the first experiment did not significantly reduce the bias.

Hybrid Intrusion Detection and Prediction multiAgent System HIDPAS
Farah Jemili,Montaceur Zaghdoud,Mohamed Ben Ahmed
Computer Science , 2009,
Abstract: This paper proposes an intrusion detection and prediction system based on uncertain and imprecise inference networks and its implementation. Giving a historic of sessions, it is about proposing a method of supervised learning doubled of a classifier permitting to extract the necessary knowledge in order to identify the presence or not of an intrusion in a session and in the positive case to recognize its type and to predict the possible intrusions that will follow it. The proposed system takes into account the uncertainty and imprecision that can affect the statistical data of the historic. The systematic utilization of an unique probability distribution to represent this type of knowledge supposes a too rich subjective information and risk to be in part arbitrary. One of the first objectives of this work was therefore to permit the consistency between the manner of which we represent information and information which we really dispose.
Dunkl Translation and Uncentered Maximal Operator on the Real Line
Chokri Abdelkefi,Mohamed Sifi
International Journal of Mathematics and Mathematical Sciences , 2007, DOI: 10.1155/2007/87808
Abstract: We establish estimates of the Dunkl translation of the characteristic function χ[−ɛ,ɛ], ɛ>0, and we prove that the uncentered maximal operator associated with the Dunkl operator is of weak type (1,1). As a consequence, we obtain the Lp-boundedness of this operator for 1
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