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Advances in Materials Physics and Chemistry 2011年第3期1卷 78-85页

作者： Lassaad Ghali Slah Msahli Mondher Zidi faouzi sakli 不详

The effect of chemical modification, reinforcement structure and fiber weight ratio on the flexural proprieties of Luffa-polyester composites was studied. A unsaturated polyester matrix reinforced with a mat of Luffa external wall fibers (ComLEMat), a short Luffa external wall fibers(ComLEBC) and a short Luffa core fi-bers (ComLCBC) was fabricated under various conditions of fibers treatments (combined process, acetylat-ing and cyanoethylating) and fiber weight ratio. It resorts that acetylating and cyanoethylating enhance the flexural strength and the flexural modulus. The fiber weight ratio influenced the flexural properties of com-posites. Indeed, a maximum value of strength and strain is observed over a 10% fiber weight ratio. The uses of various reinforcement structures were investigated. The enhancement of elongation at break and the strain values of the composite reinforced by natural mat was proved.

关键词： Luffa Fibers Composite Flexural Properties Fiber Weight Ratio

Modelling Absorption Capacity Performance of Hygienic Product

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Open Journal of Applied Sciences 2013年第2期3卷 169-173页

作者： Soumaya Sayeb Mohamed Ben Hassen faouzi sakli Textile Engineering Laboratory Monastir University Monastir Tunisia

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.

关键词： Model Absorption Capacity Hygienic Product Superabsorbent

Effect of Blending Ratio of Fibers on the Properties of Nonwoven Fabrics Based of Alfa Fibers

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Advances in Materials Physics and Chemistry 2014年第6期4卷 116-125页

作者： Lassaad Ghali Mohamed Taher Halimi Mohamed Ben Hassen faouzi sakli Textile Engineering Laboratory Monastir University Monastir Tunisia

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.

关键词： Alfa Fibers Nonwoven Air Permeability Specific Strength

Surface Morphology Investigation of Tunisian Dromedary Hair

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农业科学与技术：A 2014年第5期4卷 454-459页

作者： Taoufik Harizi Slah Msahli faouzi sakli Mosleh Mekki Touhami Khorchani Textile Engineering Laboratory Monastir Unversity Ksar Hella15070 Tunisia Livestock & Wildlife Laboratory Arid Lands Institute Medenine 4119 Tunisia

In raw materials of dromedary hair, there are two distinct fibre populations: The fine one is of textile relevance and the coarse one is rather worthless and must be as a rule separated prior to spinning and subsequent processing. The fibre surface morphology and fibre fineness of Tunisian dromedary hair has been investigated by means of scanning electron microscope (SEM). SEM microscopic method provides the fibre diameter, the scale shape, the scale frequency and scale height. The results show that dehaired dromedary fibre presents a relatively low mean fibre diameter (≈ 17 μm) with a high coefficient of variation (CV ≈ 25%). The scales of the dromedary fibre are on average extremely long and quite visible, they tend not to protrude from the fibre, appear almost convex, and provide a wavy appearance in profile of the relatively coarse fibre. On counting the scale frequency, that is, the number of scale margins within a determined fibre length of 100 μm on the surface of a fine (diameter 30 μm) dromedary fibre, comes out roughly five at eight and eight at twelve scale margins, respectively. The mean height of the cuticle scale is 0.12 μm and 0.24 μm, respectively, for fine and coarse dromedary fibre. These explain why dromedary fibres present a soft touch due to the prominence of the scale edges. This aspect of the surface structure has a high correlation with the felting capacity of the matter, and contributes to the concepts of handle and gloss.

关键词：表面形态骆驼毛突尼斯单峰纤维细度扫描电子显微镜纤维直径平均高度

Transport network downsizing based on optimal sub-network

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Communications in Transportation Research 2022年第1期2卷 317-332页

作者： Matthieu Guillot Angelo Furno El-Houssaine Aghezzaf Nour-Eddin El faouzi Univ Gustave Eiffel Univ LyonENTPELICITF-69518LyonFrance Department of Industrial Systems Engineering and Product Design Faculty of Engineering and ArchitectureGhent UniversityGhentBelgium Industrial Systems Engineering(ISyE) Flanders MakeLommelBelgium

Transportation networks are sized to efficiently achieve some set of service *** particular circumstances,such as the COVID-19 pandemic,the demand for transportation can significantly change,both qualitatively and quantitatively,resulting in an over-capacitated and less efficient *** this paper,we address this issue by proposing a framework for resizing the network to efficiently cope with the new *** framework includes a model to determine an optimal transportation sub-network that guarantees the following:(i)the minimal access time from any node of the urban network to the new sub-network has not excessively increased compared to that of the original transportation network;(ii)the delay induced on any itinerary by the removal of nodes from the original transportation network has not excessively increased;and(iii)the number of removed nodes from the transportation network is within a preset known factor.A solution is optimal if it induces a minimal global *** modelled this problem as a Mixed Integer Linear Program and applied it to the public bus transportation network of Lyon,France,in a case *** order to respond to operational issues,the framework also includes a decision tool that helps the network planners to decide which bus lines to close and which ones to leave open according to specific trade-off *** results on real data in Lyon show that the optimal sub-network from the MILP model can be used to feed the decision tool,leading to operational scenarios for network planners.

关键词： Public transportation network Linear programming Decision tool Downsizing networks Case study

HYPERCYCLICITY, SUPERCYCLICITY AND GENERALIZED RAKOEVIC'S PROPERTY

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Acta Mathematica Scientia 2017年第2期37卷 503-510页

作者： Mohamed AMOUCH Youness faouzi Department of Mathematics University Chouaib Doukkali Faculty of Sciences Eljadida 24000 Eljadida Morocco

A Banach space operator satisfies generalized RakoSevi5＇s property （gw） if the complement of its upper semi B-Weyl spectrum in its approximate point spectrum is the set of eigenvalues of T which are isolated in the... 详细信息

关键词： Weyl's and ^-Weyl's theorems generalized Weyl's and generalized a^Weyl's theorems Browder's and a-Browder's theorems generalized Browder's and generalized a-Browder's hypercyclicity supercyclicity Rakocevic's property

杂化化合物(C_(7)H_(11)N_(2))_(2)[CdCl_(4)]·0.5H_(2)O的晶体结构、光谱表征和光学性质

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无机化学学报 2022年第9期38卷 1834-1842页

作者： Fatma Garci Axel Klein Hammouda Chebbi Mohamed faouzi Zid University of Tunis El Manar Faculty of Sciences of TunisLaboratory of MaterialsCrystal Chemistry and Applied ThermodynamicsTunisTunisia University of Cologne Faculty of Mathematics and Natural SciencesDepartment of ChemistryInstitute for Inorganic ChemistryCologneGermany University of Tunis Preparatory Institute for Engineering Studies of TunisTunisTunisia

开发了标题化合物(C_(7)H_(11)N_(2))_(2)[CdCl_(4)]·0.5H_(2)O(C_(7)H_(11)N_(2)=4-(二甲基氨基)吡啶鎓)的制备程序,并得到良好的收率和纯度。Cd离子在略微扭曲的四面体环境中与4个氯离子配位。晶体排列显示出层状结构,有机层和无机... 详细信息

开发了标题化合物(C_(7)H_(11)N_(2))_(2)[CdCl_(4)]·0.5H_(2)O(C_(7)H_(11)N_(2)=4-(二甲基氨基)吡啶鎓)的制备程序,并得到良好的收率和纯度。Cd离子在略微扭曲的四面体环境中与4个氯离子配位。晶体排列显示出层状结构,有机层和无机层交替排列,平行于(001)平面,位于x=n+1/2(n∈Z)。在晶体中,有机层和无机层通过C—H…Cl、C—H…O、N—H…Cl和N—H…O氢键相互作用连接。Hirshfeld表面分析和结构的指纹图表明分子堆积受氢键和π堆积的控制。UV-Vis漫反射光谱使我们能够用Tauc外推法确定具有半导体特性的3.596 eV的直接带隙。观察到的在562 nm处具有最大值的光致发光带归属于4-(二甲基氨基)吡啶鎓阳离子中的激发π-π*态。

关键词：氯镉(Ⅱ)配离子 4-二甲氨基吡啶鎓晶体结构 Hirshfeld表面分析光致发光

ERROR ESTIMATES FOR THE RECURSIVE LINEARIZATION OF INVERSE MEDIUM PROBLEMS

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Journal of Computational Mathematics 2010年第6期28卷 725-744页

作者： Gang Bao faouzi Triki Department of Mathematics Michigan State University East Lansing MI 48824-1027 USA LMC-IMAG Universite Joseph Fourier I B.P. 53 38041 Grenoble Cedex 9 France

This paper is devoted to the mathematical analysis of a general recursive linearization algorithm for solving inverse medium problems with multi-frequency measurements. Under some reasonable assumptions, it is shown that the algorithm is convergent with error estimates. The work is motivated by our effort to analyze recent significant numerical results for solving inverse medium problems. Based on the uncertainty principle, the recursive linearization allows the nonlinear inverse problems to be reduced to a set of linear problems and be solved recursively in a proper order according to the measurements. As an application, the convergence of the recursive linearization algorithm [Chen, Inverse Problems 13（1997）, pp.253-282] is established for solving the acoustic inverse scattering problem.

关键词： Recursive linearization Tikhonov regularization Inverse problems Convergence analysis.

Reconstruction of a defect in an open waveguide

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Science China Mathematics 2013年第12期56卷 2539-2548页

作者： BAO Gang TRIKI faouzi Department of Mathematics Zhejiang University Department of Mathematics Michigan State UniversityEast Lansing MI 48824 USA Laboratoire Jean Kuntzmann Universit'e Joseph Fourier & CNRS38041 Grenoble Cedex 9 France

The paper is concerned with the reconstruction of a defect in the core of a two-dimensional open waveguide from the scattering *** only a fnite numbers of modes can propagate without attenuation inside the core,the problem is similar to the one-dimensional inverse medium *** particular,the inverse problem sufers from a lack of uniqueness and is known to be severely *** overcome these difculties,we consider multi-frequency scattering *** uniqueness of solution to the inverse problem is established from the far feld scattering information over an interval of low frequencies.

关键词：缺陷波导重构生日散射有限数逆问题低频率

Global Stability Analysis of Switched Nonlinear Observers

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International Journal of Automation and computing 2015年第4期12卷 432-439页

作者： Imen Manaa Nabil Barhoumi faouzi Msahli The National Engineering School of Monastir Department of Electrical EngineeringStudy of Industrial Systems and Renewable Energy

This paper considers the problem of simultaneous estimation of the system states and the strategy of commutation for a larger class of nonlinear switched ***,a hybrid high gain observer is considered to get the exact estimation of the continuous states where the strategy of switching is previously ***,an extension to a larger class of nonlinear hybrid systems with arbitrary switching is *** analysis is widely discussed for the two cases to provide a finite-time convergence of the estimation *** effectiveness of the proposed hybrid high gain observer has been proved by applying it to a quadruple tank process.

关键词： Nonlinear hybrid system switching strategies Lyapunov function stability analysis