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Search Results: 1 - 10 of 18485 matches for " Ali Zaoui "
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Enhancement of Ferromagnetic Ordering Curie Temperature in N-Doped MgO under Hydrostatic Pressure  [PDF]
Ali Mir, Benaissa Bekkouche, Abdelkader Boukortt, Salima Kacimi, Mostefa Djermouni, Ali Zaoui
Modeling and Numerical Simulation of Material Science (MNSMS) , 2012, DOI: 10.4236/mnsms.2012.22004
Abstract: We have explored the magnetic properties of Nitrogen doped cubic MgO using the full potential linearized augmented plane wave (FP-LAPW) method. The unit cell has 128 atoms, and two Nitrogen atoms are placed in the positions of oxygen sites. This corresponds to 3.125% doping concentration. Our calculations predict that the ferromagnetic state, with a magnetic moment of about 1.0 μB per Nitrogen-dopant, is more favorable in energy than the nonmagnetic state, and the ferromagnetic correlations are influenced by the impurity bound state. The magnetic moment mainly arises from p orbital of Nitrogen which substitutes the Oxygen atom, with a little contribution from the Oxygen atoms surrounding Nitrogen atom. The resulting band structure and densities of states agree well with the recent theoretical works. The ferromagnetic ordering temperatures obtained from DFT simulations have been given in detail. Our results show that the pressure enhances the temperature in MgO:N.
Spinoza : un autre salut par le corps ?
Pierre Zaoui
Astérion , 2005,
Abstract: Spinoza formule ainsi l’une des dernières propositions de l’éthique, la 39e de la cinquième partie : Qui a un corps apte au plus grand nombre d’actions, a un esprit dont la plus grande partie est éternelle. Par rapport à ce qui a été dit de l’unité de l’esprit et du corps humains depuis la deuxième partie, cette proposition semble aller de soi : qui a un corps puissant aura des affects conformes à l’ordre de l’entendement, et donc aura un esprit également puissant, c’est-à-dire éternel. Toutefois, une telle proposition n’en est pas moins étrange par rapport à l’ordre concret du salut qui, dans l’éthique, en tant que béatitude ou connaissance du troisième genre, est uniquement d’ordre intellectuel. Y aurait-il donc un autre salut par le corps que Spinoza ne décrit pas mais qui aurait spinozistement un sens ? Et si oui, comment parvenir ainsi à se sauver en réformant primordialement non son ame mais son corps ? L’ensemble de cet article tente de répondre à cette question. One of the last proposals of Spinoza’s Ethica (the 39th of the fifth part) says this : Who has a body able to the greatest number of acts, has a mind whom the greatest part is eternal . In relation with what was said about the unit of body and mind since the second part, that proposal seems obvious : who has a powerful body will get some affects suitable to the mind’s order, hence will get a mind as powerful, that is to say eternal. However, such a proposal becomes curious when it is analysed from the point of view of salvation which, in The Ethica, as Beatitude or third kind’s knowledge, follows a only intellectual way. Would it be un other kind of salvation, a salvation by the body, what Spinoza doesn’t describe but what would get a spinozistic meaning ? And if we answer positively, how to obtain such a salvation by changing his body’s acts before his mind ? Here is the mean question of this issue.
Partitioning an Image Database by K_means Algorithm
Houaria Abed,Lynda Zaoui
Journal of Applied Sciences , 2011,
Abstract: Unsupervised classification has emerged as a popular technique for pattern recognition, image processing and data mining. It has a crucial contribution in the resolution of the problems arising from content-based image retrieval. In this study, we present K_means clustering algorithm that partitions an image database in cluster of images similar. We adapt K_means method to a very special structure which is quadree. The goal is to minimize the search time of images similar to an image request. We associate to each image a quad-tree which represents the characteristics of the image and store a base of images in a data structure called generic quadtree. It minimizes the memory space of set of image by the sharing of common parts between quad trees and speeds up several operations applied to images. The image similarity is based on a distance computed from the differences between the quad trees encoding images.
Behavior of the Trinomial Arcs when
Kaoutar Lamrini Uahabi,Mohammed Zaoui
International Journal of Mathematics and Mathematical Sciences , 2007, DOI: 10.1155/2007/91535
Abstract: We deal with the family B(n,k,r) of trinomial arcs defined as the set of roots of the trinomial equation zn=αzk
The oxydative stress as inductive process of toxic action of the Cadmium on the Yeast (Saccharomyces cerevisiae)
Zaoui lilia,Djebar Mohamed Reda
Technologies de Laboratoire , 2011,
Abstract: As part in evaluation of the impact of the toxicity of heavy metals on the environment, we led a study the behavior of Yeast Saccharomyces cerevisiae towards a xenobiotic and more particularly a heavy metal: the Cadmium on the metabolism energetic. This work concerns the influence of second xenobiotic Zinc applied in treatment combined with cadmium in the presence and / or the absence of calcium on the respiratory activity of Saccharomyces cerevisiae. The obtained results showed inhibition of respiratory activity with an assimilation of oxygen about (52%) to cells treated with the concentrations 5mM and 10mM, whereas the yeast treated with Cd2+ / Ca2+ and Cd2+ / Zn2+ has a respiratory activity with a high consumption of higher oxygen (56%) compared with cells of control. This could possibly show that the activity of detoxification involvement would be dependent energy. Therefore, the measure of respiratory activity shows that the accumulation of Cd can be associated with the oxydative stress reflecting the toxic action of the Cadmium, where from the treatment in the presence of the calcium and / zinc can forbid and reduce its unwanted effects.
2P-MED: BUILDING A PERSONALIZATION PLATFORM FOR MEDIATION SYSTEMS
IMANE ZAOUI,,DALILA CHIADMI,,LAILA BENHLIMA
International Journal of Engineering Science and Technology , 2011,
Abstract: Nowadays, with the increasing number of integrated data sources, there is a real trend to personalize mediation systems to improve user satisfaction. To make these systems user sensitive, we propose a personalization platform called 2P-Med. 2P-Med allows personalizing any mediation system used in any domain following a cyclic process. The process includes building and managing adequate user profiles and sources profiles, content and quality matching, source selection, adapting the mediator responses to user preferences and handling userfeedbacks. In this paper, we describe 2P-Med architecture and highlight its main functionalities. We also illustrate the operation of the platform through personalizing source selection in a travel planning assistant.
Improving automatic image annotation: Approach by Bag-Of-Key Point
Merad Boudia Mohammed Abdelaziz,Zaoui Lynda
International Journal of Computer Science Issues , 2012,
Abstract: Automatic image annotation is to associate each image a set of keywords and describing the visual content of the image using an automatic system without any human intervention, many approaches have been proposed for the realization of such a system However, it is still inefficient in terms of semantic description of the image. Recent works show a frequent use of a special technique known as bag-of-key points that describes an image as a set of local descriptors using a histogram. Each bin of the histogram represents the importance of a visual pattern (called visual word) in the image. But crucial representation choices - such as the choice of local features, the steps of building the visual vocabulary - have not been thoroughly studied in existing works. In this paper, a novel approach based on Scale Invariant Features Transform (SIFT) features and treatment of the different steps of building de vocabulary are proposed. The proposed approach creates more robust signatures for images and better reflects the weight of visual words. The categorization of images has been the subject of the second phase of this approach. The purpose of this phase was to find a classification model that best suits the index method proposed, while avoiding problems due to large data and large dimension. Experiments with Corel-1000 dataset demonstrate that the proposed improvements outperform known techniques in scene categorization.
Accurate Image Search using Local Descriptors into a Compact Image Representation
Soumia Benkrama,Lynda Zaoui,Christophe Charrier
International Journal of Computer Science Issues , 2013,
Abstract: Progress in image retrieval by using low-level features, such as colors, textures and shapes, the performance is still unsatisfied as there are existing gaps between low-level features and high-level semantic concepts. In this work, we present an improved implementation for the bag of visual words approach. We propose a image retrieval system based on bag-of-features (BoF) model by using scale invariant feature transform (SIFT) and speeded up robust features (SURF). In literature SIFT and SURF give of good results. Based on this observation, we decide to use a bag-of-features approach over quaternion zernike moments (QZM). We compare the results of SIFT and SURF with those of QZM. We propose an indexing method for content based search task that aims to retrieve collection of images and returns a ranked list of objects in response to a query image. Experimental results with the Coil-100 and corel-1000 image database, demonstrate that QZM produces a better performance than known representations (SIFT and SURF).
Representation and Storage of Colours Images in Databases using a Rtree Generic Structure
L. Zaoui,H. Abed,H. Belbachir
Journal of Applied Sciences , 2006,
Abstract: Many geographical applications, medical, etc. are brought to manage images which occupy much place memory and which have similar characteristic to be similar or not very different. Sometimes these latter require to work on areas of images, to make the follow-up of the evolution of same areas in various images, to preserve different states from the same image, Each state corresponding to the result of an operation or a series of particular operations. We present, in this study a solution of this problem, based on the approach of Versions of Data bases, which consists in representing the colour images in the form of trees called Generic tree. This structure minimizes storage by sharing information between the images. This method makes it possible to apply various update operations as research, insertion, suppression and modification of the images simultaneously.
2P-Med: Building a Personalization Platform for Mediation Systems
Imane Zaoui,Dalila Chiadmi,Laila Benhlima
Computer Science , 2011,
Abstract: Nowadays, with the increasing number of integrated data sources, there is a real trend to personalize mediation systems to improve user satisfaction. To make these systems user sensitive, we propose a personalization platform called 2P-Med. 2P-Med allows personalizing any mediation system used in any domain following a cyclic process. The process includes building and managing adequate user profiles and sources profiles, content and quality matching, source selection, adapting the mediator responses to user preferences and handling user feedbacks. In this paper, we describe 2P-Med architecture and highlight its main functionalities. We also illustrate the operation of the platform through personalizing source selection in a travel planning assistant.
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