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Search Results: 1 - 10 of 8964 matches for " Faouzi Mohamed "
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Hydrothermal Synthesis of V3O7..H2O Nanobelts and Study of Their Electrochemical Properties  [PDF]
Mohamed Kamel Chine, Faouzi Sediri, Neji Gharbi
Materials Sciences and Applications (MSA) , 2011, DOI: 10.4236/msa.2011.28129
Abstract: Vanadium oxide hydrate V3O7..H2O (H2V3O8) nanobelts have been synthesized by hydrothermal approach using V2O5 as vanadium source and phenolphthalein as structure-directing agent. Techniques X-ray powder diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), infrared spectroscopy and nitrogen adsorption/desorption isotherms have been used to characterize the structure, morphology and composition of the nanobelts. The V3O7. H2O nanobelts are up to several hundreds of nanometers, the widths and thicknesses are 90 and 40 nm, respectively. The electroactivity of the nanobelts has been investigated. The as-synthesized material is promising for chemical and energy-related applications such as catalysts, electrochemical device and it may be applied in rechargeable lithium-ion batteries.
Modelling Absorption Capacity Performance of Hygienic Product  [PDF]
Soumaya Sayeb, Mohamed Ben Hassen, Faouzi Sakli
Open Journal of Applied Sciences (OJAppS) , 2013, DOI: 10.4236/ojapps.2013.32023

The performance prediction of hygienic products can be a major advantage for manufacturers. Among the interesting performances to be expected, we find the absorption capacity. This is a parameter governed by the composition of the absorbent core, particularly the fibrous component and the characteristics of the superabsorbent polymer (SAP). Thus, various theoretical models have been established to predict the absorption capacity. All these models have taken into account the nature of the fibrous support and the ratio of superabsorbent polymer. Certainly, other factors, less obvious in their modelling, are involved in determining the performance such as the homogeneity of the mixture formed by the fluff and SAP, the distribution of polymer particles in the entire structure, the porous structure, the shape of the capillary, the nature of the nonwoven webs used, etc. Various theoretical models are proposed here to describe the absorption capacity and we will outline the model which best describes this performance. The experimental test results are discussed to verify if the theoretical model selected can be confirmed.

Integration of Remote Sensing and GIS in Studying Land Cover Trends and Conditions in the Middle Ziz Oasis, Morocco  [PDF]
Ali Essahlaoui, Abba Mohamed, Eddahby Lhou, Faouzi Mohamed, Larabi Abdelkader
International Journal of Geosciences (IJG) , 2013, DOI: 10.4236/ijg.2013.47095

A better understanding of the changing patterns of land use and vegetation cover is a major concern for countries whose ecosystems are under severe degradation. Indeed, the dynamics of land have direct implications on the availability of natural resources. The palm grove, of oases of Errachidia region, plays an important role in the environmental, social and economic of this region. This research was conducted in the Ziz middle, which is affected by changes in the conditions and composition of land cover change. The application of remote sensing, geographic information systems and satellite imagery analysis with multi-temporal and spatial land use provides, for territorial managers, data updated and improved and a synopsis for effective management of natural resources. This research explores the possibility of identifying, monitoring and mapping land use change and land use on the dynamics of the palm grove in the past 40 years. Satellite images used are Landsat images and multi-temporal dates (MSS (1972), TM (1987), ETM + (2001, 2006 and 2011). These images were georeferenced and radiometrically corrected. In our study, the use of vegetation indices NDVI, SAVI and MASAVI, highlight the magnitude of changes in vegetation cover between 1972 and 2011. A regressive pronounced canopy is generally recognized in the Middle Ziz. This decline is explained by the combined effect of anthropic action (urbanization) and climatic conditions.

Effect of Blending Ratio of Fibers on the Properties of Nonwoven Fabrics Based of Alfa Fibers  [PDF]
Lassaad Ghali, Mohamed Taher Halimi, Mohamed Ben Hassen, Faouzi Sakli
Advances in Materials Physics and Chemistry (AMPC) , 2014, DOI: 10.4236/ampc.2014.46014
Abstract: Natural fibers are nowadays increasingly employed for making nonwoven, replacing the synthetic materials due to economic and environmental considerations. In this setting, we examine the use of Alfa fibers in nonwoven. Extracted Alfa fibers present satisfying mechanical properties that allow them to be used to produce nonwoven textiles materials. Therefore, Alfa fibers are, mainly, blended with cotton, polyester, Tencel and wool. Webs are prepared using cotton or wool cards in regular width. The nonwoven consolidation is made by needle-punching method. The weight, thickness, air permeability, adiathermic capacity and tensile properties are investigated. The results exhibit that the air permeability increases with the increase of Alfa fibers ratio for the nonwoven Alfa blended with short fibers. It decreases in case of Alfa/Wool blend. We can conclude also that the nonwoven Alfa blended with wool fibers have the highest properties values for all the Alfa fibers blends. Data also revealed that the tensile properties are reduced with the increment of Alfa fibers ratio.
Model-Checking of Ordered Multi-Pushdown Automata
Mohamed Faouzi Atig
Computer Science , 2012, DOI: 10.2168/LMCS-8(3:20)2012
Abstract: We address the verification problem of ordered multi-pushdown automata: A multi-stack extension of pushdown automata that comes with a constraint on stack transitions such that a pop can only be performed on the first non-empty stack. First, we show that the emptiness problem for ordered multi-pushdown automata is in 2ETIME. Then, we prove that, for an ordered multi-pushdown automata, the set of all predecessors of a regular set of configurations is an effectively constructible regular set. We exploit this result to solve the global model-checking which consists in computing the set of all configurations of an ordered multi-pushdown automaton that satisfy a given w-regular property (expressible in linear-time temporal logics or the linear-time \mu-calculus). As an immediate consequence, we obtain an 2ETIME upper bound for the model-checking problem of w-regular properties for ordered multi-pushdown automata (matching its lower-bound).
Synthesis, Crystal Structure and Electrical Properties of a New Mixed Compound (Na0.71Ag0.29)2CoP2O7  [PDF]
Riadh Marzouki, Abderrahmen Guesmi, Mohamed Faouzi Zid, Ahmed Driss
Crystal Structure Theory and Applications (CSTA) , 2012, DOI: 10.4236/csta.2012.13013

A new cobalt diphosphate (Na0.71Ag0.29)2CoP2O7, is synthesized by solid state reaction method and characterized by single-crystal X-ray diffraction. The title material crystallizes in the triclinic space group P-1 with a = 6.4170(3) \"\", b = 9.4510(2) \"\", c = 10.9350(3) \"\", a = 115.240(2)o, b = 80.190(3)o and g = 106.810(2)0. The structure presents a centro-symmetrical clusters Co4P4O28 consists of two Co2O11 units and two P2O7 pyrophosphate groups. The junction between clusters is assured by two P2O7 groups to form a three-dimensional anionic framework having different interconnecting tunnels running along [100] and [010]. The former contains the Na+ and Ag+ cations. The conductivity measurements of (Na0.71Ag0.29)2CoP2O7 are studied over a temperature interval from 783 to 903 K using the frequency response analyzer with 0.5 V amplitude signal over the range of 13 MHz - 5 Hz.

Quadratic differentials and algebraic Cauchy transform
Mohamed Jalel Atia,Faouzi Thabet
Mathematics , 2015,
Abstract: In this paper, we discuss the representability almost everywhere (a.e.) in the plane of an irreducible algebraic function as the Cauchy transform of a signed measure supported on a finite number of compact semi-analytic curves and a finite number of isolated points. We discuss the existence of critical trajectories of a family of quadratic differentials.
Proceedings 14th International Workshop on Verification of Infinite-State Systems
Mohamed Faouzi Atig,Ahmed Rezine
Computer Science , 2013, DOI: 10.4204/EPTCS.107
Abstract: This volume contains the proceedings of Infinity'12, the 14th International Workshop on Verification of Infinite-State Systems, which was held in Paris, France on the 27th of August 2012 as a satellite event of FM'12. The aim of the INFINITY workshop is to provide a forum for researchers interested in the development of formal methods and algorithmic techniques for the analysis of systems with infinitely many states, and their application in automated verification of complex software and hardware systems.
Approximating Petri Net Reachability Along Context-free Traces
Mohamed Faouzi Atig,Pierre Ganty
Computer Science , 2011, DOI: 10.4230/LIPIcs.FSTTCS.2011.152
Abstract: We investigate the problem asking whether the intersection of a context-free language (CFL) and a Petri net language (PNL) is empty. Our contribution to solve this long-standing problem which relates, for instance, to the reachability analysis of recursive programs over unbounded data domain, is to identify a class of CFLs called the finite-index CFLs for which the problem is decidable. The k-index approximation of a CFL can be obtained by discarding all the words that cannot be derived within a budget k on the number of occurrences of non-terminals. A finite-index CFL is thus a CFL which coincides with its k-index approximation for some k. We decide whether the intersection of a finite-index CFL and a PNL is empty by reducing it to the reachability problem of Petri nets with weak inhibitor arcs, a class of systems with infinitely many states for which reachability is known to be decidable. Conversely, we show that the reachability problem for a Petri net with weak inhibitor arcs reduces to the emptiness problem of a finite-index CFL intersected with a PNL.
Magnetic Materials Characterizations Device under Rotating Field Based on Experimental Set up Approach
Mohamed Faouzi Rachedi,Rabah Diabi,Abdallah Moussaoui
Asian Journal of Information Technology , 2012,
Abstract: It is important to be able to characterize magnetic materials under the effect of a rotating field and to specify the influence of anisotropy. In this goal, different methods are used classically. In this study we describe the main features of a novel set-up for the determination of rotational hysteresis power losses in soft magnetic materials. The flux search coil has 2 windings wound along diagonal lines of a square insulator into which the specimen is inserted, addition and subtraction of two output voltages from these winding give the signals proportional to the flux change rate in the direction parallel and transverse to the longitudinal direction of the ribbon therefore, two values of loss corresponding to two magnetizing directions are obtained using a numeric acquisition and measurement result treatments. A non oriented 3.5% Silicon-Iron power loss measurements in a very large induction range, are reported.
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