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Mechanical Characterisation of Interface for Steel/Polymer Composite Using Pull-out Test: Shear-Lag and Frictional Analysis

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Journal of Materials Science & Technology 2006年第4期22卷 552-558页

作者： Mohamed KHARRAT Maher DAMMAK amine charfi Institut Préparatoire aux Etudes d'Ingénieurs de Sfax Tunisia Laboratoire des Systèmes ElectromécaniquesEcole Nationale d'Ingénieurs de SfaxTunisia Laboratoire des Systèmes Electromécaniques Ecole Nationale d'Ingénieurs de SfaxTunisia

Fibre-matrix interface is known to have contribution to the mechanical performance of fibre-reinforced composite by its potential for load transfer between the fibre and the matrix. Such load transfer is of great importance in dentistry when a post is used for fixing a ceramic crown on the tooth. In this study, a pull-out test was carried out to analyse the interfacial properties of a steel fibre embedded in a polyester and epoxy matrices. It was found that the fibre-matrix interface is debonded on the whole embedded length when the fibre stress reached the debonding stress. Then, the fibre stress fell down to the initial extraction stress required to pulling out the debonded fibre from the matrix. Both debonding stress and initial extraction stress initiated a linear increase with the implantation length after the debonding stress reached horizontal asymptotes. To analyse the fibre-matrix load transfer before debonding, an analytical shear-lag model was adopted to in this test conditions. Fitting the experimental results with the analytical model provided the interfacial shear strength. By considering the Coulomb friction at the fibre-matrix interface during the fibre extraction process, an analytical model which considers Poisson＇s effects on both fibre and matrix, was developed. In this model, knowledge of the initial extraction stress of the fibre provides the residual normal stress at the fibre-matrix interface.

关键词： Fibre Matrix Interface Pull-out Shear-lag Debonding Friction

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ON A CHARACTERIZATION OF THE S-ESSENTIAL SPECTRA OF THE SUM AND THE PRODUCT OF TWO OPERATORS AND APPLICATION TO A TRANSPORT OPERATOR

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Acta Mathematica Scientia 2015年第6期35卷 1285-1304页

作者： Salma charfi Sassia RAHALI Département de Mathématiques Faculté des Sciences de Sfax Université de Sfax

In this paper, we develop some operational calculus inspired from the Fredholm operator theory to investigate the S-essential spectra of the sum and the product of two operators acting on a Banach space. Furthermore, we apply the obtained results to determine the S-essential spectra of an integro-differential operator with abstract boundary conditions in L1（[-a,a]×[-1,1]）（a〉0）.

关键词： Fredholm operator Fredholm perturbation S-essential spectra transport operator

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E-fuel system: a conceptual breakthrough for energy storage

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Science Bulletin 2019年第4期64卷 227-228页

作者： Khalil amine Chemical Sciences and Engineering Division Argonne National Laboratory

The demand for renewables such as solar and wind power has become stronger than ever in the past few decades and their numerous advantages have nearly risen to the status of common knowledge. However, as solar and wind power are intermittent in nature, the electricity generated from these renewable sources only comprise a low fraction of global electricity production. Enabling the widespread use of renewables requires energy storage technology that is site-independent, efficient, scalable, stable, cost-effective, safe, energy dense and continuous in operation. To date, none of the existing technologies have adequately met the attributes necessary for storing intermittent and scattered solar, wind and other sources of renewable energy. Pumped hydro and compressed air are scalable and cost-effective, but are limited by geography and geology [1].

关键词： demand technologies attributes

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An energy-degree evaluation metric for clustering purposes in mobile ad hoc networks

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International Journal of Modeling, Simulation, and Scientific Computing 2019年第2期10卷 114-132页

作者： Khalil amine MOAD6 Research Team MASI LaboratoryE3S Research Centre Mohammadia School of Engineering Mohammed V University of RabatMorocco

Network clustering is the process of partitioning a network into a number of virtual entities mastered by certain nodes,called cluster centers that are responsible for collecting and maintaining topology information and managing the routing *** ad hoc networking,clustering has been introduced to deal with the dynamic topology by providing a temporarily stable network *** process mainly depends on the metric upon which the selection of cluster centers is performed.A wide range of clustering metrics were introduced in the literature based on network issues including mobility and connectivity degree,giving rise to a variety of clustering *** clustering provides energy consumption reduction,residual energy has not received enough attention and few studies have addressed the clustering on the basis of this *** paper discusses the current clustering metrics and proposes an energy-degree evaluation metric with mobility consideration taking into account the nodes residual energy and the network connectivity as two main keys of clustering.

关键词： Ad hoc networks clustering dominating set energy aware mobility

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Stability analysis of an SIR epidemic model with homestead-isolation on the susceptible and infectious,immunity,relapse and general incidence rate

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International Journal of Biomathematics 2023年第5期16卷 1-22页

作者： amine Bernoussi Equations au dérivees partielles Algebre et Géométrie spectrales Department of MathematicsFaculty of ScienceIbn Tofail University BP 13314000 KenitraMorocco

In this paper,we propose the global dynamics of an SIR epidemic model with distributed latent period,immunity,relapse,homestead-isolation of the susceptible and infectious individuals and general incidence *** resulting model has a disease-free equilibrium and if Ro>1,then the SIR epidemic model admits a unique endemic *** using suitable Lyapunov functionals and LaSalle's invariance principle,the global stability of the disease-free equilibrium and the endemic equilibrium is established,under suitable monotonicity conditions on the incidence function.

关键词： An SIR epidemic model homestead-isolation on the susceptible and infectious Lyapunov function LaSalle's invariance principle global stability.

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Boosted on-chip energy storage with transistors

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National Science Review 2022年第10期9卷 56-57页

作者： Tongchao Liu Khalil amine Chemical Sciences and Engineering Division Argonne National Laboratory Materials Science and Engineering Stanford University

On-chip energy-storage devices play an important role in powering wireless environmental sensors and microelectrome chanical systems [1,2].Starting from the 1980s,on-chip energy-storage devices,including microbatteries and super capacitors,have been applied to power the real-time clock on a chip [3].These tiny batteries/supercapacitors enable the real-time clock to keep working when the electronics are *** this way,electronic devices can be restarted with a valid *** the development of electronic devices,signal processing and communication have become much faster,while also requiring more powerful energy-storage devices to drive them [4-6].

关键词： high-temperature superconductivity oxygen doping electric field effect all-solid-state field effect transistor superconductor–insulator transition

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RING OPENING POLYMERIZATION OF TETRAHYDROFURAN CATALYSED BY MAGHNITE-H^+

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Chinese Journal of Polymer Science 2012年第1期30卷 56-62页

作者： Khadidja Benkenfoud amine Harrane Mohammed Belbachir Laboratoire de Chimie des Polymeres Departement de Chimie Faculte des SciencesUniversite d'Oran Es-SeniaBP No 1524 El M'Naouar31000 OranAlgeria

The cationic ring-opening polymerization of tetrahydrofiiran using maghnite-H~＋ is ***-H~＋,is a non-toxic solid catalyst issued from proton exchanged montmorillonite ***,also called ＂poly（butandiol） ether＂,with acetate and hydroxyl end groups was successfully *** of reaction temperature, weight ratio of initiator/monomer and reaction time on the conversion of monomer and on the molecular weight are investigated.A cationic mechanism of the reaction was *** chemistry can be considered as a suitable route for preparing poly（THF） as a soft segment for thermoplastic elastomers.

关键词： Montmorillonite Maghnite Ring opening polymerization THF

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Numerical investigation of the stresses in backfilled stopes overlying a sill mat

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Journal of Rock Mechanics and Geotechnical Engineering 2017年第3期9卷 108-119页

作者： Mohamed amine Sobhi Li Li Research Institute on Mines and the Environment Department of Civil Geological and Mining Engineering école Polytechnique de Montréal MontréalCanada

Backfill is commonly used in underground mines to help increase the ore recovery rate and reduce the ore dilution. The use of a part of mine waste as underground backfill material also helps reduce the environmental impact of mining operations. After all, backfill is used to provide a working platform or safer working space. Its primary and most important role is to improve the rock mass stability around mine openings. However, most available solutions to stress analyses were developed for an isolated stope, without taking into account the influence of mine depth, or of adjacent stopes. In this paper,results from a numerical study carried out to evaluate the stresses in backfilled stopes overlying a sill mat are presented. Mine depth and excavation of the underlying stope below the sill mat(horizontal pillar)are both taken into consideration. The influence of stope geometry, backfill, sill mat and rock properties on the stresses is also evaluated. Compared with the case of a single isolated backfilled stope, the numerical results show that the stress magnitudes in the overlying backfill are considerably increased due to the excavation of the underlying stope. In general, the stresses also increase with mine depth and backfill stiffness, while these tend to decrease with an increase in the surrounding rock mass *** results suggest that existing solutions for backfill design may need to be revised.

关键词： Mine depth Backfill Sill mat Stresses Numerical modeling

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Strategies to enable microsized alloy anodes for high-energy and long-life alkali-ion batteries

INDUSTRIAL CHEMISTRY & MATERIALS

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INDUSTRIAL CHEMISTRY & MATERIALS 2024年第4期2卷 489-513页

作者： Daali, amine amine, Rachid Otieno, Wilkistar Xu, Gui-Liang amine, Khalil Argonne Natl Lab Chem Sci & Engn Div Lemont IL 60439 USA Univ Wisconsin Milwaukee Coll Engn & Appl Sci Dept Ind & Mfg Engn Milwaukee WI 53211 USA Mat Sci Div Argonne Natl Lab Lemont IL 60439 USA

Micro-sized anode materials demonstrate greater potential for practical applications than nanomaterials in the aspects of volumetric energy density, coulombic efficiency, fabrication process, and cost. However, the huge volume changes of alloy anodes (up to similar to 500%) during repeated charge/discharge has led to a series of challenging issues including pulverization of active material particles and delamination from current collectors, formation of thick and fragile solid-electrolyte interphase (SEI) and depletion of electrolytes, eventually leading to rapid cell degradation. Herein, we review recent progress of rational strategies to enable the use of microsized alloy anodes (Si, P, Sb, Sn, etc.) including electrolyte modulation, binder design and architecture engineering. We also provide perspectives on future directions and remaining challenges of microsized anodes towards practical ***: Volume change;Alloy;Anodes;Microsized;Alkali-ion;Batteries.

关键词： Anodes

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Endoscopic retrieval of gastric trichobezoar after fragmentation with electrocautery using polypectomy snare and argon plasma coagulation in a pediatric patient

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Gastroenterology Report 2016年第3期4卷 251-253,I0003页

作者： Mohammed amine Benatta Digestive Endoscopy Unit Military Central HospitalAlgiersAlgeria

Trichobezoars are rare,composed of hair and more common in female pediatric patients with psychiatric *** extraction is the most common removal *** two endoscopic removals after fragmentation have beenreported in the English *** report herein a third case of a trichobezoar that was successfully retrieved afterendoscopic fragmentation with snare polypectomy and argon plasma coagulation in a six-year-old female *** mass was completely removed in 10 pieces after 15 *** patient’s course was *** monthslater,she is doing *** endoscopic removal was effective,minimally invasive and time saving.

关键词： trichobezoar retrieval endoscopic fragmentation

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