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Metallic and highly conducting two-dimensional atomic arrays of sulfur enabled by molybdenum disulfide nanotemplate

npj Computational Materials 2017年第1期3卷 115-122页

作者： Shuze Zhu Xiumei Geng Yang Han mourad benamara Liao Chen Jingxiao Li Ismail Bilgin Hongli Zhu Department of Chemical Engineering Massachusetts Institute of TechnologyCambridgeMA 02139USA Department of Mechanical and Industrial Engineering Northeastern UniversityBostonMA 02115USA Institute for Nanoscale Materials Science and Engineering University of ArkansasFayettevilleAR 72701USA Department of Physics Northeastern UniversityBostonMA 02115USA

Element sulfur in nature is an insulating *** it has been tested that one-dimensional sulfur chain is metallic and conducting,the investigation on two-dimensional sulfur remains *** report that molybdenum disulfide layers are able to serve as the nanotemplate to facilitate the formation of two-dimensional *** functional theory calculations suggest that confined inbetween layers of molybdenum disulfide,sulfur atoms are able to form two-dimensional triangular arrays that are highly *** a result,these arrays contribute to the high conductivity and metallic phase of the hybrid structures of molybdenum disulfide layers and two-dimensional sulfur *** experimentally measured conductivity of such hybrid structures reaches up to 223 S/*** experimental results,including X-ray photoelectron spectroscopy(XPS),transition electron microscope(TEM),selected area electron diffraction(SAED),agree with the computational *** to the excellent conductivity,the current density is linearly proportional to the scan rate until 30,000 mV s^(−1) without the attendance of conductive *** such hybrid structures as electrode,the two-electrode supercapacitor cells yield a power density of 10^(6) Wh kg^(−1) and energy density ~47.5 Wh kg^(−1) in ionic liquid *** findings offer new insights into using two-dimensional materials and their Van der Waals heterostructures as nanotemplates to pattern foreign atoms for unprecedented material properties.

关键词： molybdenum sulfur dimensional

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Molecular Layer Deposition of Crosslinked Polymeric Lithicone for Superior Lithium Metal Anodes

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Energy Material Advances 2021年第1期2021卷 62-77页

作者： Xiangbo Meng Kah Chun Lau Hua Zhou Sujan Kumar Ghosh mourad benamara Min Zou Department of Mechanical Engineering University of ArkansasFayettevilleAR 72701USA Department of Physics and Astronomy California State University NorthridgeCA 91330USA Advanced Photon Source Argonne National LaboratoryLemontIL 60439USA Institute for Nanoscience and Engineering University of ArkansasFayettevilleAR 72701USA

In this work,we for the first time developed a novel lithium-containing crosslinked polymeric material,a lithicone that enables excellent protection effects over lithium(Li)metal *** new lithicone was synthesized via an accurately controllable molecular layer deposition(MLD)process,in which lithium tert-butoxide(LTB)and glycerol(GL)were used as *** resultant LiGL lithicone was analyzed using a suite of ***,we found that the LiGL thichicone could serve as an exceptional polymeric protection film over Li metal *** experimental data revealed that the Li electrodes coated by this LiGL lithicone can achieve a superior cycling stability,accounting for an extremely long cyclability of>13,600 Listripping/plating cycles and having no failures so far in Li/Li symmetric cells at a current density of 5 mA/cm^(2)and an areal capacity of 1 mAh/cm^(2).We found that,with a sufficient protection by this LiGL coating,Li electrodes could realize long-term stable cyclability with little formation of Li dendrites and solid electrolyte *** novel LiGL represents a facile and effective solution to the existing issues of Li anodes and potentially paves a technically feasible route for lithium metal batteries.

关键词： lithium stripping exceptional

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High-performance LiNi_(0.8)Mn_(0.1)Co_(0.1)O_(2) cathode by nanoscale lithium sulfide coating via atomic layer deposition

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Journal of Energy Chemistry 2022年第6期31卷 531-540,I0015页

作者： Xin Wang Jiyu Cai Yang Ren mourad benamara Xinwei Zhou Yan Li Zonghai Chen Hua Zhou Xianghui Xiao Yuzi Liu Xiangbo Meng Department of Mechanical Engineering University of ArkansasFayettevilleAR 72701USA Chemical Sciences and Engineering Division Argonne National LaboratoryLemontIL 60439USA The Advanced Photon Source Argonne National LaboratoryLemontIL 60439USA Institute for Nanoscience and Engineering University of ArkansasFayettevilleAR 72701USA Center for Nanoscale Materials Argonne National LaboratoryLemontIL 60439USA Institute of High Energy Physics Chinese Academy of SciencesBeijing 100049China University of Chinese Academy Sciences Beijing 100049China National Synchrotron Light Source II Brookhaven National LaboratoryUptonNY 11973USA

The commercialization of nickel-rich LiNi_(0.8)Mn_(0.1)Co_(0.1)O_(2)(NMC811) has been hindered by its continuous loss of practical capacity and reduction in average working *** address these issues,surface modification has been well-recognized as an effective *** from the coatings reported in literature to date,in this work,we for the first time report a sulfide coating,amorphous Li_(2)S via atomic layer deposition (ALD).Our study revealed that the conformal nano-Li_(2)S coating shows exceptional protection over the NMC811 cathodes,accounting for the dramatically boosted capacity retention from~11.6%to~71%and the evidently mitigated voltage reduction from 0.39 to 0.18 V after 500 charge–discharge *** addition,the Li_(2)S coating remarkably improved the rate capability of the NMC811 *** investigation further revealed that all these beneficial effects of the ALD-deposited nano-Li_(2)S coating lie in the following aspects:(i) maintain the mechanical integrity of the NMC811 electrode:(ii) stabilize the NMC electrode/electrolyte interface:and (iii) suppress the irreversible phase transition of NMC ***,this study also has revealed that the nano-Li_(2)S coating has played some unique role not associated with traditional non-sulfide coatings such as *** this regard,we disclosed that the Li_(2)S layer has reacted with the released O_(2) from the NMC lattices,and thereby has dramatically mitigated electrolyte oxidation and electrode ***,this study is significant and has demonstrated that sulfides may be an important class of coating materials to tackle the issues of NMCs and other layered cathodes in lithium batteries.

关键词： Nickel-rich cathodes Atomic layer deposition Lithium sulfide Microcracking Phase transition Interfacial reactions

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Effects of Gold Nanorods on Nonlinear Properties of Graphene Films Using Z-Scan Technique

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Journal of Physical Science and Application 2017年第2期7卷 1-9页

作者： Thekrayat Al Abdulaall Morgan Ware mourad benamara Alex Biris Viney Saini Gregory Salamo Department of Physics Institute for Nanoscience and Engineering University of Arkansas Fayetteville AR 72 701 USA Department of Electrical Engineering University of Arkansas Fayetteville AR 72701 USA Center of Integrative Nanotechnology Sciences University of Arkansas at Little Rock Little Rock AR 72204 USA

Two dimensional nanomaterials, specifically graphene, can play a significant role in various photonic and electronic devices. This is especially true in handling the enormous heat in high density electronics and in nonlinear optics when using high power lasers. To model these systems it is important to know the thermal-optical properties of graphene. In this paper, we report on the thermal and optical linear and nonlinear properties of graphene materials using Z-scan system. In particular, we explore the thermo-optical properties of graphene, with and without gold nanorods （AuNRs）. The obtained results illustrate that the addition of gold nanorods causes a significant change in thermal nonlinear refractive index coefficients of graphene, due to the plasmonic enhancements.

关键词： Graphene gold nanorods nonlinear properties Z-scan.

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Energy Decay for the Elastic Wave Equation with A Local Time-dependent Nonlinear Damping

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Acta Mathematica Sinica,English Series 2008年第7期24卷 1175-1192页

作者： mourad BELLASSOUED Faculty of Sciences of Bizerte Department of Mathematics7021 Jarzouna BizerteTunisia

In this paper, we shall investigate the decay property of the solutions to the initial-boundary value problem for the elastic wave equation with a local time-dependent nonlinear damping. We give some decay rate of the energy when the damping term is effective only in a neighborhood of a suitable subset of the boundary. The results obtained in this paper extend, in particular, the known results for the scalar wave equation.

关键词： stabilization energy decay rate elasticity system

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Hybrid immunizing solution for job recommender system

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Frontiers of Computer Science 2017年第3期11卷 511-527页

作者： Shaha AL-OTAIBI mourad YKHLEF Department of Information Systems College of Computer and Information Sciences Princess Nourah Bint Abdulrahman University Riyadh 11671 Saudi Arabia Department of Information Systems College of Computer and Information Sciences King Saud University Riyadh 11543 Saudi Arabia

Two traditional recommendation techniques, content-based and collaborative filtering （CF）, have been widely used in a broad range of domain areas. Both meth- ods have their advantages and disadvantages, and some of the defects can be resolved by integrating both techniques in a hybrid model to improve the quality of the recommendation. In this article, we will present a problem-oriented approach to design a hybrid immunizing solution for job recommen- dation problem from applicant＇s perspective. The proposed approach aims to recommend the best chances of opening jobs to the applicant who searches for job. It combines the artificial immune system （AIS）, which has a powerful explo- ration capability in polynomial time, with the collaborative filtering, which can exploit the neighbors＇ interests. We will discuss the design issues, as well as the hybridization process that should be applied to the problem. Finally, experimental studies are conducted and the results show the importance of our approach for solving the job recommendation problem.

关键词： content-based collaborative filtering (CF) hy- bridization computational intelligence (CI) artificial im- mune system (AIS) clonal selection correlation-based simi- larity

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Analytical fits to the synchrotron functions

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Research in Astronomy and Astrophysics 2013年第6期13卷 680-686页

作者： mourad Fouka Saad Ouichaoui Research Center in Astronomy Astrophysics and GeophysicsB. P. 63 Algiers ObservatoryBouzaréah Algiers Algeria Université des Sciences et de la Technologie Houari Boumediène (USTHB) Faculté dePhysique Laboratoire SNIRMB.P. 32 El-Alia 16111 Bab Ezzouar Algiers Algeria

Accurate fitting formulae to the synchrotron function, F（x）, and its com- plementary function, G（x）, are performed and presented. The corresponding relative errors are less than 0.26% and 0.035% for F（x） and G（x）, respectively. To this end we have, first, fitted the modified Bessel functions, Ks/3（x） and K2/3（x）. For all the fitted functions, the general fit expression is the same, and is based on the well known asymptotic forms for low and large values of z for each function. It consists of multi- plying each asymptotic form by a function that tends to unity or zero for low and large values of z. Simple formulae are suggested in this paper, depending on adjustable parameters. The latter have been determined by adopting the Levenberg-Marquardt algorithm. The proposed formulae should be of great utility and simplicity for com- puting spectral powers and the degree of polarization for synchrotron radiation, both for laboratory and astrophysical applications.

关键词： radiation processes: non thermal -- methods: analytical

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Parametric Estimation of Interconnected Nonlinear Systems Described by Input-output Mathematical Models

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International Journal of Automation and computing 2016年第4期13卷 364-381页

作者： mourad Elloumi Samira Kamoun Laboratory of Sciences and Techniques of Automatic Control & Computer Engineering National Engineering School of Sfax (ENIS) University of Sfax Tunisia B.P. 1173 3038 Sfax Tunisia

In this paper, two types of mathematical models are developed to describe the dynamics of large-scale nonlinear systems, which are composed of several interconnected nonlinear subsystems. Each subsystem can be described by an input-output nonlinear discrete-time mathematical model, with unknown, but constant or slowly time-varying parameters. Then, two recursive estimation methods are used to solve the parametric estimation problem for the considered class of the interconnected nonlinear systems. These methods are based on the recursive least squares techniques and the prediction error method. Convergence analysis is provided using the hyper-stability and positivity method and the differential equation approach. A numerical simulation example of the parametric estimation of a stochastic interconnected nonlinear hydraulic system is treated.

关键词： Large-scale nonlinear systems interconnected nonlinear systems deterministic systems stochastic systems input-outputmathematical models parametric estimation algorithm convergence analysis.

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Additive Preservers of Drazin Invertible Operators with Bounded Index

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Acta Mathematica Sinica,English Series 2017年第9期33卷 1225-1241页

作者： mourad OUDGHIRI Khalid SOUILAH Departement Math-Info Labo LAGAFaculte des SciencesUniversite Mohammed Premier60000 OujdaMaroc

Let B（X） be the algebra of all bounded linear operators on an infinite-dimensional complex or real Banach space X. Given an integer n 〉 1, we show that an additive surjective map Ф on B（X） preserves Drazin invertible operators of index non-greater than n in both directions if and only if Ф is either of the form Ф（T） = aATA-1 or of the form Ф（T） = aBT＊B-1 where a is a non-zero scalar, A ： X → X and B ： X＊ → X are two bounded invertible linear or conjugate linear operators.

关键词： Linear preserver problems Drazin inverse ascent descent

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A comprehensive simulator for assessing the reliability of a photovoltaic panel peak power tracking system

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Frontiers in Energy 2015年第2期9卷 170-179页

作者： Nabil KAHOUL mourad HOUABES Ammar NECAIBIA Laboratoire d' Electrotechnique d' Annaba Badji Mokhtar-AnnabaUniversity Annaba 23000 Algeria Research Unit of Renewable Energy in Saharan Middle (URER/MS) Adrar 01000 Algeria

When designing a maximum power point tracking （MPPT） algorithm, it is often difficult to correctly predict, before field testing, the behavior of this MPPT under varying solar irradiation on photovoltaic （PV） panels. A solution to this problem is to design a maximum power point trackers simulator of a PV system used to test MPPT algorithms. This simulator must have the same role as the MPPT card of the PV panel and thus will fully emulate the response of a real MPPT card of the PV panel. Therefore, it is a good substitute to help to test the peak power trackers of the PV system in the laboratory. This paper describes a simple peak power trackers simulator of the PV system which has a short response time thus, can be used to test MPPT algorithms under very rapid variation condition. The obtained results and the theoretical operation confirm the reliability and the superior perfor- mance of the proposed model.

关键词： photovoltaicdesign maximum powermicroprocessormodule DC-DC converter,point tracking (MPPT) card,

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