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Chinese Journal of Chemical Engineering 2018年第5期26卷 1219-1228页

作者： abdeldjalil zegaoui Ruikun Ma Abdul Qadeer Dayo Mehdi Derradji Jun Wang Wenben Liu Yile Xu Wan'an Cai Institute of Composite Materials Key Laboratory of Superlight Material and Surface Technology of Ministry of Education College of Materials Science and Chemical Engineering Harbin Engineering University

This present study deals with the reinforcement of thermosetting resin blends composed of cyanate ester(CE) and benzoxazine(BOZ) resins with natural hemp fibers(NHFs). These NHFs were initially treated by using a silane coupling agent(SCA) in order to chiefly enhance their distributions as well as adhesions within the CE/BOZ resin matrix,then incorporated with various weight amounts ranging from 5 wt% to 20 wt% with a regular interval of 5 wt%. The obtained results showed that at the maximum treated fiber loading(20 wt%), distinctive enhancements in the mechanical properties in terms of flexural strength and microhardness were obtained. Besides, the thermal stability and glass transition temperature(Tg) were appreciably enhanced and were higher than those of the pure CE/BOZ resin properties. With respect to the astonishing properties of the NHFs, these enhancements could be possibly due to the good dispersion and adhesion of the treated NHFs inside the CE/BOZ resin achieved upon using the SCA. Therefore,we believe herein that these renewable and cheap NHFs have considerable potential to be used as reinfocer materials for CE/BOZ resin composites to be used in various industrial sectors.

关键词： Cyanate ester Benzoxazine Hemp fibers Thermal stabilities Mechanical properties

APPROXIMATE CONTROLLABILITY OF FRACTIONAL IMPULSIVE NEUTRAL STOCHASTIC INTEGRO-DIFFERENTIAL EQUATIONS WITH NONLOCAL CONDITIONS AND INFINITE DELAY

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Annals of Differential Equations 2015年第2期31卷 127-139页

作者： abdeldjalil Slama Ahmed Boudaoui Dept. of Math. and Computer Science University of Adrar Dept. of Probability and Statistics USTHB

This paper is concerned with the approximate controllability of nonlinear fractional impulsive neutral stochastic integro-differential equations with nonlocal conditions and infinite delay in Hilbert spaces under the assumptions that the corresponding linear system is approximately controllable. By the Krasnoselskii-Schaefer-type fixed point theorem and stochastic analysis theory, some sufficient conditions are given for the approximate controllability of the system. At the end, an example is given to illustrate the application of our result.

关键词： approximate controllability fixed point principle fractional impulsive neutral stochastic integro-differential equations mild solution nonlocal conditions

Aggressiveness Assessment of Two Fusarium spp. on Durum Wheat Grain Coleoptiles under Controlled Conditions

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Phyton-International Journal of Experimental Botany 2024年第11期93卷 2983-2992页

作者： Salah Hadjout Mohamed Zouidi Houcine Bougrine abdeldjalil Belkendil Amer Zeghmar Walid Ouaret Walid Soufan Fathi Abdellatif Belhouadjeb Centre de Recherche en Amenagement du Territoire(CRAT) Campus Zouaghi SlimaneRoute de Ain el BeyConstantine25000Algerie Ecole Nationale Superieure Agronomique(ENSA) Alger16200Algerie Department of Geographical Sciences University of MarylandCollege ParkMD 20742USA Plant Production Department College of Food and Agriculture SciencesKing Saud UniversityRiyadh11451Saudi Arabia Centre de Recherche en Agropastoralisme(CRAPast) Djelfa17000Algerie

Fusarium head blight(FHB)is a disease caused by several Fusarium species,notably,*** and *** pathogens adversely affect the technological and sanitary qualities of cereal grains,particularly durum *** favorable environmental conditions and in susceptible varieties,these Fusarium species can signiﬁcantly reduce both the quantity and quality of *** study evaluated the pathogenicity of the two Fusarium species(FC2006 and FG2008)in the growth of durum wheat *** plant material included four commercially grown parental varieties(G9,G10,G11,G12)and eight breeding lines(G1,G2,G3,G4,G5,G6,G7,G8).In vitro tests revealed that both Fusarium species signiﬁcantly reduced the coleoptile growth across the studied varieties and lines(p≤0.001).The control test had an average coleoptile length of 37.87 *** contrast,seeds inoculated with FC2006 had an average length of 0.62 mm,and those inoculated with FG2008 had only 0.064 *** there was a slight difference in aggressiveness between the two spe-cies,it was not statistically signiﬁcant(p>0.05).Some variability was also noted in the responses of the durum wheat varieties and *** G8 genotype showed remarkable behavior in both isolates,with an average length of 1.83 mm for FC2006 and 0.4 mm for *** other genotypes showed total inhibition of coleoptile growth(0 mm).Theseﬁndings highlight the importance of conducting further research on the defense mechanisms of durum wheat against Fusarium and assessing the local varieties’pathogenicity to better explore the interactions between these pathogens and durum wheat genotypes under in vitro conditions.

关键词： Fusarium species aggressiveness coleoptile growth durum wheat in vitro test

A Highly Efficient Algorithm for Phased-Array mmWave Massive MIMO Beamforming

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Computers, Materials & Continua 2021年第10期69卷 679-694页

作者： Ayman Abdulhadi Althuwayb Fazirulhisyam Hashim Jiun Terng Liew Imran Khan Jeong Woo Lee Emmanuel Ampoma Affum abdeldjalil Ouahabi Sébastien Jacques Department of Electrical Engineering Jouf UniversitySakakaAljouf72388Kingdom of Saudi Arabia Department of Computer and Communication Systems Engineering Faculty of EngineeringUniversiti Putra Malaysia(UPM)Serdang43400Malaysia Department of Electrical Engineering University of Engineering and Technology PeshawarPakistan School of Electrical and Electronics Engineering Chung-Ang UniversitySeoul06974Korea Electrical and Electronic Department Kwame Nkrumah University of Science and TechnologyKumasiGhana UMR 1253 iBrainUniversitéde ToursINSERMToursFrance LIMPAF Laboratory Department of Computer ScienceUniversity of BouiraBouira10000Algeria University of Tours(France) GREMAN UMR 7347CNRSINSA Centre Val-de-LoireTours37100France

With the rapid development of the mobile internet and the internet of things(IoT),the fifth generation(5G)mobile communication system is seeing explosive growth in data *** addition,low-frequency spectrum resources are becoming increasingly scarce and there is now an urgent need to switch to higher frequency *** wave(mmWave)technology has several outstanding features—it is one of the most well-known 5G technologies and has the capacity to fulfil many of the requirements of future wireless ***,it has an abundant resource spectrum,which can significantly increase the communication rate of a mobile communication *** such,it is now considered a key technology for future mobile *** communication technology also has a more open network architecture;it can deliver varied services and be applied in many *** contrast,traditional,all-digital precoding systems have the drawbacks of high computational complexity and higher power *** paper examines the implementation of a new hybrid precoding system that significantly reduces both calculational complexity and energy *** primary idea is to generate several sub-channels with equal gain by dividing the channel by the geometric mean decomposition(GMD).In this process,the objective function of the spectral efficiency is derived,then the basic tracking principle and least square(LS)techniques are deployed to design the proposed hybrid *** results show that the proposed algorithm significantly improves system performance and reduces computational complexity by more than 45%compared to traditional algorithms.

关键词： 5G mmWave phased array algorithm antenna beamforming

Improvement Properties of the Cutting Tools Using Technical Plasma Treatment

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Materials Sciences and Applications 2011年第10期2卷 1465-1470页

作者： Ferkous Embarek Amara Idriss Djeribaa abdeldjalil Boughouas Hamlaoui Achour Slimane 不详

In spite of the considerable progress made in the domain of the sciences of materials, cutting tools subjected to an intense abrasive wear and a very high temperature of edge. They record during their use an reduced working life. The operations of machining on lathe are regularly stopped for replacing these tools, which influences enormously the production process. Indeed, the search the new materials of substitution, remain a domain very coveted, owing to the fact, it belongs to one stake very significant industrial, in particular, in the mechanical domain and its varied sectors. The recourse to the thermal treatments traditional, limiting in an interval, reduces the wear and the excessive consumption of these cutting tools, but the principal concern of the experts and researchers, in the domain of the mechanical engineering, remain posed. The goal of this study is the introduction of the technique of plasmas, as physical phenomenon, for making material of coating at base of titanium nitrides doped at iron, at the different concentrations. To this objective, one magnetron sputtering with plasma was used for the realization of the coatings deposed on the active parts of the cutting tools. During the experimentation, it was noted that the cutting tools which are treated by plasma, subjected to the machining operations on lathe and the hardness tests, presents one improvement of their hardness and a remarkable increase in their lifespan.

关键词： Cutting Tools Plasma Nitride Titanium Doping Target Hardness

Relevance of the P ＆ O MPPT Technique in an Original PV-Powered Water Pumping Application

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Journal of Energy and Power Engineering 2015年第11期9卷 1008-1018页

作者： Said Aissou Sebastien Jacques Zahra Mokrani Djamila Rekioua Toufik Rekioua abdeldjalil Ouahabi Electrical Engineering Department University of Bejaia Bejaia 06000 Algeria Electronics and Energy Department Polytech Tours University ofT ours Tours 37200 France Research Group on Materials Microelectronics Acoustics & Nanotechnology University of Tours Tours 37200 France

Many papers exploiting the various MPPT （maximum power point tracking） techniques in PV （photovoltaic） applications, from the simple to the most complicated, can be found in literature. However, these techniques may not always be easy to implement in industrial applications. The main challenge of this paper is to model and implement the P ＆ O （perturb and observe） algorithm in a low-cost PV-powered pumping system. To that end, a comparative investigation of the performance characteristics of the most popular MPPT methods, such as FOCV （fractional open circuit voltage）, FSCC （fractional short circuit current）, FLC （fuzzy logic control）, ANN （artificial neural network） and INC （incremental conductance） is presented. This analysis is helpful to highlight the relevance of the P ＆ O technique taking better account of complexity, difficulty of implementation and cost considerations in water pumping applications. The targeted PV-powered pumping system is based on a single-phase induction motor supplied by a three-phase inverter controlled by the DTC （direct torque control） technique. This stand-alone PV system is dedicated to water pumping, especially in rural areas that have no access to national grids but have sufficient amount of solar radiation. Simulation modeling （Matlab/Simulink） and experimental results are presented to demonstrate the relevance of the system.

关键词： DC-DC power converter MPPT algorithms P & O stand-alone PV-powered water pumping system.