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Stabilization of fractional bilinear systems with multiple inputs

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Applied Mathematics(A Journal of Chinese Universities) 2023年第1期38卷 78-88页

作者： Thouraya Kharrat Fehmi mabrouk Fawzi Omri Department of Mathematics Faculty of Sciences of SfaxUniversity of SfaxTunisia

In this paper,we study in a constructive way the stabilization problem of fractional bilinear systems with multiple *** the quadratic Lyapunov functions and some additional hypotheses on the unit sphere,we construct stabilizing feedback laws for the considered fractional bilinear system.A numerical example is given to illustrate the efficiency of the obtained result.

关键词： stabilization fractional system bilinear system multiple inputs Lyapunov functions

Reduction of vibration by periodically stitched sandwich panel

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Chinese Journal of Aeronautics 2021年第7期34卷 39-49页

作者： Nan LI mabrouk BEN TAHAR Liang MENG Fusheng SUI Key Laboratory of Noise and Vibration Research Institute of AcousticsChinese Academy of SciencesBeijing 100190China Sorbonne Universites Universitede Technologie de CompiegneCNRSUMR 7337 RobervalCentre de Recherche RoyallieuCS 60319Compiegne Cedex 60203France State IJR Center of Aerospace Design and Additive Manufacturing Northwestern Polytechnical UniversityXi’an 710072China School of Physical Sciences University of Chinese Academy of SciencesBeijing 100049China

This work reveals that the addition of periodically distributed stitches to sandwich structure enables a significant reduction of vibration in stop-band and this new functionality is systematically ***,a finite element model which is capable of taking into consideration the three layers of the sandwich as well as the stitches is *** diagram of dispersion is calculated by applying Floquet-Bloch theorem to the boundaries of unit *** properly chosen properties of stitches,a stop-band for flexural wave is *** stop-band is further confirmed by the forced response of a large stitched sandwich panel under point *** level of vibration in the stop-band is significantly *** influence of the stitch rigidity and density on upper and lower limits of stop-band is also examined,which confirms that stitched sandwich can be tuned to mitigate vibration in a certain frequency band with appropriate stitch *** investigations have demonstrated the potential application of stitched sandwich in the area of vibration reduction.

关键词： Composite structure Parametric study Periodic structures Reduction of vibration Stitched sandwich

Numerical investigation of low relative humidity aeration impact on the moisture content of stored wheat

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International Journal of Modeling, Simulation, and Scientific Computing 2017年第2期8卷 39-54页

作者： Faten Hammami Salah Ben mabrouk Abdelkhader Mami Laboratory of Energy and Thermal Processes Research and Technology Centre of Energy CRTEn.P.B:95.Hammam-Life 2050Tunisia Laboratory of Analysis Conception and Control Systems Faculty of Sciences of Tunis.Tunis El Manar1002Tunisia

High moisture content wheat kernels are subject to elevated respiration rates due to enzyme activity and mould growth that reduce the dry grain and may produce suffi-cient energy which may be harmful to wheat *** aeration provides a powerful nonchemical stored grain insect ***,aeration is a suitable and economical device to overcome this *** moisture management is vital to prevent spoilage in stored *** objective of this study is to investigate the influence of using low relative humidity(RH)aeration on the wheat moisture *** numerical investigation based on heat and mass balances is developed and used to simulate the evolution of grain temperature and moisture under various air RH in a wheat storage *** show that the dehumidification of blown air had greater potential for decreasing RH of interstitial air and wheat moisture at 30◦C temperature and RH of 40%,50%and 60%.

关键词： Wheat storage moisture content dehumidifier aeration relative humidity simulation.

Mechanical and Metallurgical Characterization of HSLA X70Welded Pipeline Steel Subjected to Successive Repairs

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Acta Metallurgica Sinica(English Letters) 2016年第6期29卷 568-576页

作者： Bouzid Maamache mabrouk Bouabdallah Abdelhalim Brahimi Youcef Yahmi Billel Cheniti Brahim Mehdi Research Center in Industrial Technologies(CRTI) P.O.Box 6416014 CheragaAlgeria Laboratoire des Aeronefs Universite de Blidal09000 BlidaAlgeria LGSDS Ecole Nationale PolytechniqueEl Harrach16200AlgiersAlgeria LTSM Universite de Blidal09000 BlidaAlgeria ICMMO/SP2M Bat 410Universite Paris-Sud 1191405Orsay CedexFrance

The aim of this work is to study the influence of successive weld repairs on the microstructure and the mechanical behavior of the heat-affected zone（HAZ） of an HSLA X70 steel. Detailed microstructural examination combined to grain size measurement showed that beyond the second weld repair, the microstructure of the HAZ undergoes significant change in the grain morphology and grain growth. The results of the X-ray diffraction analyzed using MAUD software indicated an increase in the crystallite size and a decrease in the dislocation density according to the number of weld repair operations. Consequently, a loss of mechanical properties, namely the yield strength and the toughness with the number of weld repairs, was recorded. Beyond the second weld repair operation, the properties of the welded joint do not fulfill the standards applied in piping industry.

关键词： HSLA X70 steel Successive weld repair Heat affected zone Dislocation density

Electrochemical behavior and analytical detection of Imidacloprid insecticide on a BDD electrode using square-wave voltammetric method

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Chinese Chemical Letters 2016年第5期27卷 666-672页

作者： mabrouk Ben Brahim Hafedh Belhadj Ammar Ridha Abdelhedi Youssef Samet Electrochemistry and Environmental Laboratory Department of Materials Engineering National Engineering School of Sfax University of Sfax B.P. I 1733038 Sfax Tunisia

A sensitive square-wave voltammetric method for the determination of lmidacloprid （IMD） was developed using electrochemically pretreated boron-doped diamond （BDD） electrode. Aqueous solutions were prepared with Confidor 200 SL as the commercial formulation of IMD. Sodium sulfate （Na2SO4） was used as supporting electrolyte. The influence of operating parameters, such as the pH of the medium, frequency, pulse amplitude, scan increment and the concentration of IMD was investigated. An irreversible cathodic peak, corresponding to the reduction oflMD is observed at 1.21 V （vs. SCE） and the electrode reaction was controlled by adsorption. Under optimized conditions, the square-wave reduction peak current was linear over the concentration range of （30-200 μmol L 1） with a detection and quantification limits of 8.60 μmol L 1 and 28.67 μmol L 1, respectively. The results were compared with spectrophotometry and HPLC methods under some conditions and found to be in good agreement. To investigate applicability to real samples, the proposed method was applied to the determination of IMD in plum juice.

关键词： Imidacloprid Square-wave volammetry Boron-doped diamond electrode Electrochemical detection

Study of a Generalized Nonlinear Euler-Poisson-Darboux System:Numerical and Bessel Based Solutions

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Journal of Partial Differential Equations 2020年第4期33卷 313-340页

作者： RIADH Chteoui SABRINE Arfaoui ANOUAR Ben mabrouk Laboratory of Algebra Number Theory and Nonlinear Analysis LR15ES18Department of MathematicsFaculty of Sciences5019 Monastir.Tunisia Department of Mathematics Higher Institute of Applied Mathematics and Computer ScienceUniversity of KairouanStreet of Assad Ibn Al-FouratKairouan 3100Tunisia Department of Mathematics Faculty of SciencesUniversity of TabukKSA

In this paper a nonlinear Euler-Poisson-Darboux system is *** a first part,we proved the genericity of the hypergeometric functions in the development of exact solutions for such a system in some special cases leading to Bessel type differential ***,a finite difference scheme in two-dimensional case has been *** continuous system is transformed into an algebraic quasi linear discrete one leading to generalized Lyapunov-Sylvester *** discrete algebraic system is proved to be uniquely solvable,stable and convergent based on Lyapunov criterion of stability and Lax-Richtmyer equivalence theorem for the convergence.A numerical example has been provided at the end to illustrate the efficiency of the numerical scheme developed in section *** present method is thus proved to be more accurate than existing ones and lead to faster algorithms.

关键词： Finite difference method Lyapunov-Sylvester operators generalized Euler-Poisson-Darboux equation hyperbolic equation Lauricella hypergeometric functions

Effects of formic acid and corn flour supplementation of banana pseudostem silages on nutritional quality of silage,growth,digestion,rumen fermentation and cellulolytic bacterial community of Nubian black goats

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Journal of Integrative Agriculture 2021年第8期20卷 2214-2226页

作者： Zhang Hao Cheng Xuan mabrouk ELSABAGH Lin Bo Wang Hong-rong Laboratory of Metabolic Manipulation of Herbivorous Animal Nutrition College of Animal Science and TechnologyYangzhou UniversityYangzhou 225009P.R.China Joint International Research Laboratory of Agriculture and Agri-Product Safety Ministry of Education/Yangzhou UniversityYangzhou 225009P.R.China Department of Animal Production and Technologies Faculty of Agricultural Sciences and TechnologiesNiğdeÖmer Halisdemir UniversityNiğde 51240Turkey Department of Nutrition and Clinical Nutrition Faculty of Veterinary MedicineKafrelsheikh UniversityKafr El-Sheikh 33516Egypt College of Animal Science Guangxi UniversityNanning 530004P.R.China

The objective of this study was to evaluate the effects of adding formic acid and corn flour supplementation to banana pseudostem silages on the nutritional quality of these silages,growth,digestion,rumen fermentation and cellulolytic bacterial community of Nubian black goats fed these *** pseudostem silage was prepared either conventionally without any additives(CON)or mixed with 0.6% formic acid(F),10% corn flour(C),or both(F+C).Four experimental diets containing 40% of the corresponding silages were designed with roughage to concentrate ratio of 50:50(dry matter(DM)basis).A total of 48 Nubian black castrated goats(body weight(BW),(22.64±1.82)kg;4-mon-old)were randomized into one of the four treatment groups with 12 replicates of one castrated goat per replicate for each treatment in a completely randomized *** group was fed on one of the four experimental diets for 40 days.A factorial arrangement of treatments of 2(formic acid levels:0 and 0.6%)×2(corn flour:0 and 10%)was *** acid supplementation increased(P0.05)for any of the other indices except for the apparent digestibility of non-fibrous carbohydrate(NFC)(P<0.05).The results demonstrated that adding 0.6% formic acid and 10% corn flour supplementation to banana pseudostem silages improved the nutritional quality of these silages and enhanced the growth performance of Nub

关键词： banana pseudostem silage goat nutrient digestion rumen fermentation ruminal cellulolytic bacteria

Robust design and analysis for opto-mechanical two array laser warning system

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Defence Technology（防务技术） 2023年第9期27卷 46-52页

作者： Mazhar Tayel Mohamed Shehata Mohamed mabrouk Abdlarhman Adel Mohamed Shady Shokry Mostafa Alshershby Faculty of Engineering Alexandria UniversityAlexandriaEgypt Egyptian Air Defense Collage AlexandriaEgypt Laser and Optoelectronics Department Technical Research CenterEgypt

In the past three decades,laser warning systems(LWS)have emerged in great importance,as the development of laser-guided weapons,such as airborne Hellfire missiles,has increased,posing an imminent threat to vital areas and *** laser warning station(LWS)can detect,classify,identify,and give alarm from laser threat at a very short time with high ***,the designers of this system must take into account the detectability and field of view to cover the area to be *** main contribution in this research is an analytical design of LWS that consists of 24 detector elements,distributed in two arrays(2×12)***,calculating the best distance between the detectors according to the laser beam spot *** addition,enhancement laser warring sensor detection capability and detection performance FOV between the detectors to increase coverage area up to 360°.Moreover,decreasing dead zone area between the laser detectors *** calculations and illustrations made to reach the best systematic design.

关键词： LWS Field of view Detector elements

Dietary N-carbamylglutamate or L-arginine supplementation improves hepatic energy status and mitochondrial function and inhibits the AMP-activated protein kinase-peroxisome proliferator- activated receptor γ coactivator-1α-transcription factor A pathway in intrauterine-growth-retarded suckling lambs

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Animal Nutrition 2021年第3期7卷 859-867页

作者： Hao Zhang Xiaoyun Liu Shengnan Ren mabrouk Elsabagh Mengzhi Wang Hongrong Wang Laboratory of Metabolic Manipulation of Herbivorous Animal Nutrition College of Animal Science and TechnologyYangzhou UniversityYangzhou225009China Joint International Research Laboratory of Agriculture and Agri-Product Safety The Ministry of Education of ChinaYangzhou UniversityYangzhou225009China Department of Animal Production and Technologies Faculty of Agricultural Sciences and TechnologiesNigde Omer Halisdemir UniversityCampusNigde51240Turkey Department of Nutrition and Clinical Nutrition Faculty of Veterinary MedicineKafrelsheikh UniversityKafr El-SheikhEgypt

The objective of this study was to investigate the effects of dietary administration of L-arginine(Arg)or N-carbamylglutamate(NCG)on hepatic energy status and mitochondrial functions in suckling Hu lambs with intrauterine growth retardation(IUGR).Forty-eight newborn Hu lambs of 7 d old were allocated into 4 treatment groups of 12 lambs each,in triplicate with 4 lambs per replicate(2 males and 2 females)as follows:CON(lambs of normal birth weight,4.25±0.14 kg),IUGR(3.01±0.12 kg),IUGR+1%Arg(2.99±0.13 kg),or IUGR+0.1%NCG(3.03±0.11 kg).The experiment lasted for 21 d,until d 28 after birth,and all lambs were fed milk replacer as a basal *** with IUGR lambs,NCG or Arg administration increased(P<0.05)the adenosine triphosphate(ATP)level and the activities of com-plexes I/III/IV,isocitrate dehydrogenase and citrate synthase in the *** with CON lambs,the relative mRNA levels of adenosine monophosphate-activated protein kinaseα1(AMPKα1),peroxisome proliferator-activated receptorγcoactivator-1α(PGC1α)and transcription factor A(TFAM)were increased(P<0.05)in the liver of IUGR lambs,but were decreased(P<0.05)in the liver of NCG-or Arg-treated lambs compared with those in the IUGR *** with IUGR lambs,NCG or Arg administration decreased(P<0.05)the total AMPKα(tAMPKα)-to-phosphorylated AMPKα(pAMPKα)ratio and the protein expression of PGC1αand *** results suggested that dietary Arg or NCG supplements improved hepatic energy status and mitochondrial function and inhibited the AMPK-PGC1α-TFAM pathway in IUGR suckling lambs.

关键词： L-Arginine Liver Intrauterine growth restriction Energy status Mitochondrial function N-carbamylglutamate