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Piecewise Smooth Dynamical Systems Modeling Based on Putzer and Fibonacci-Horner Theorems:DC-DC Converters Case

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International Journal of Automation and computing 2016年第3期13卷 246-258页

作者： Abdelkader Khoudiri Kamel Guesmi Djillali mahi Department of Sciences and Techniques Djelfa University CRe STIC IUT de Troyes

The paper deals with the problem of switched dynamical systems modeling especially in DC-DC converters case study consideration. It presents two approaches to describe accurately the behavior of this class of systems. To clarify the paper＇s contribution, the proposed approaches are validated through simulations and experimental results. A comparative study, between the obtained results and those of other techniques from the literature, is given to evaluate the performances of the studied approaches.

关键词： Switched systems DC-DC converters modeling Cayley-Hamilton theorem Putzer's theorem Fibonacci-Horner decom-position theorem.

Feature weighted clustering for user profiling

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International Journal of Modeling, Simulation, and Scientific Computing 2017年第4期8卷 245-261页

作者： Ayse Cufoglu mahi.Lohi Colin Everiss Department of Engineering University of Westminster 309 Regent StreetW1B 2HWLondonUK Department of Computer Science University of Westminster 309 Regent StreetW1B 2HWLondonUK

Personalization is the adaptation of the services to fit the user’s interests,characteristics and *** key to effective personalization is user *** from traditional collaborative and content-based approaches,a number of classification and clustering algorithms have been used to classify user related information to create user ***,they are not able to achieve accurate user *** this paper,we present a new clustering algorithm,namely Multi-Dimensional Clustering(MDC),to determine user *** MDC is a version of the Instance-Based Learner(IBL)algorithm that assigns weights to feature values and considers these weights for the *** feature weight methods are proposed for the MDC and,all three,have been tested and *** were conducted with using two sets of user profile datasets,which are the training(includes 10,000 instances)and test(includes 1000 instances)*** datasets reflect each user’s personal information,preferences and *** simulations and comparisons with existing weighted and non-weighted instance-based algorithms were carried out in order to demonstrate the performance of proposed *** results using the user profile datasets demonstrate that the proposed algorithm has better clustering accuracy performance compared to other *** work is based on the doctoral thesis of the corresponding author.

关键词： Classification clustering mining methods and algorithms user profiling and personalization

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用高温离子交换反应从锂辉石中取锂

国外稀有金属 1991年第5期 21-28页

作者： mahi.,P 毛水和

Valorization of a Good Bioceramic from Moroccan Waste Fish Bone by a Heat Treatment Method

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Journal of Renewable Materials 2019年第1期7卷 1-7页

作者： Kaoutar Kara Fatiha Ouanji El Mostapha LOTFI Mohammed El mahi.Mohamed Kacimi Laboratory of Spectroscopy Molecular ModelingMaterialsNanomaterialsWater and EnvironmentEnvironmental Materials TeamENSETMohammed V UniversityRabatMorocco Laboratory of Nanomaterial Nanotechnology and EnvironmentPhysico-chemical of Material and Catalysis(URAC26)Faculty of SciencesUniversity of Mohammed VRabat.Morocco

A tricalcium phosphate(TCP)material was produced from sardine and mackerel waste using a heat treatment method after a Soxhlet extraction to obtain the non-soluble portion of fish *** bones were annealed at temperatures between 400℃ and 1200℃.The thermal analysis(TG-DTA)was carried out to investigate the thermal stability of TCP and to confirm the removal of organic matter from the raw *** calcined bones were characterized by Fourier transform infrared spectroscopy(FT-IR),X-ray diffraction(XRD),and field emission scanning electron microscopy(FESEM).The calcium to phosphorous weight ratio was determined by ***-IR and XRD confirmed the similarities to syntheticβ-TCP(JCPDS-09-169),FE-SEM results revealed the formation of nanostructured *** results suggest that varying the isolation temperature between 600-1200℃ has tremendous impact on the production of TCP from fish bone waste with the required properties.

关键词： Hydroxyapatite tri-calcium phosphate fish bone heat treatement bioceramic

Quantitative Correlation between Group Connectivity Index and Property of Flotation Reagent

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Journal of Central South University 2000年第1期12卷 25-28页

作者： Cao, YC Jiang, yr Xue, YL Wang, DZ Cent S Univ Technol Dept Mineral Engn Changsha 410083 Peoples R China

Topological method is applied firstly to calculate the group connectivity indexes of some flotation reagents for sulfide minerals and oxide minerals. The study reveals that some properties of flotation reagents, such as group electronegativity, energy criterion, solubility product of chemicals and maximum wavelength of ultraviolet absorbency, have linear correlation with the first order group connectivity index (GCI) of polar group, and the related coefficients are all larger than 0.900. The GCI can be used to characterize the structure of groups, and is a sort of new effective structural parameter to study the quantitative structure activity relationship of flotation reagents.

关键词： flotation reagents group connectivity index property quantitative correlation

Effect of Recycling Cycles on the Mechanical and Damping Properties of Flax Fibre Reinforced Elium Composite:Experimental and Numerical Studies

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Journal of Renewable Materials 2021年第4期9卷 695-721页

作者： Sami Allagui Abderrahim El mahi.Jean-Luc Rebiere Moez Beyaoui Anas Bouguecha Mohamed Haddar Acoustics Laboratory of Le Mans University Le Mans UniversityLe Mans72085France Laboratory of Mechanics Modelling and Production National School of Engineering of SfaxSfax3038Tunisia

This manuscript deals with the effects of recycling on the static and dynamic properties of flax fibers reinforced thermoplastic *** corresponding thermoplastic used in this work is Elium ***’s the first liquid thermoplastic resin that allows the production of recycled composite parts with promising mechanical *** appeared on the resin market in *** until now,no studies were available concerning how it can be recycled and *** this study,a thermocompression recycling process was investigated and applied to Elium *** fiber-reinforced Elium composites were produced using a resin infusion process and were subjected to different thermomechanical recycling *** each material,five recycling operations were carried out on the raw material.A total of 10 different materials were investigated and tested by means of tensile and free vibration tests to evaluate the effect of recycling on their *** addition,a finite element model of the dynamic problem was developed to evaluate the loss factor and natural frequencies regarding different *** results obtained show that the failure tensile properties of Elium resin as well as flax fiber reinforced composites decrease during recycling ***,recycling induces a rise in the elastic ***,improvement in the dynamic stiffness was observed with recycling *** repeated recycling appeared to have negligible effects on the loss factor of the recycled *** results obtained from the experiment and the numerical analyses were in close agreement.

关键词： Recycling thermoplastic bio-composites thermocompression process tensile properties vibration loss factor

Damping Analysis and Failure Mechanism of 3D Printed Bio-Based Sandwich with Auxetic Core under Bending Fatigue Loading

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Journal of Renewable Materials 2021年第3期9卷 569-584页

作者： Khawla Essassi Jean-Luc Rebiere Abderrahim El mahi.Mohamed Amine Ben Souf Anas Bouguecha Mohamed Haddar Acoustics Laboratory of Mans University(LAUM)-UMR CNRS Le Mans UniversityLe Mans6613France Laboratory of Mechanics Modeling and Production(LA2MP) National School of Engineers of SfaxUniversity of SfaxSfaxTunisia

Meta-sandwich composites with three-dimensional(3D)printed architecture structure are characterized by their high ability to absorb *** this paper,static and fatigue 3-point bending tests are implemented on a 3D printed sandwich composites with a re-entrant honeycomb *** skins,core and whole sandwich are manufactured using the same bio-based material which is polylactic acid with flax fiber *** tests are performed in order to evaluate the durability and the ability of this material to dissipate ***,static tests are conducted to study the bending behaviour of the sandwich beams,as well as to determine the failure parameters and the characteristic used in fatigue ***,fatigue analyses were carried out to determine the fatigue resistance of these *** effects of the core density on the stiffness,hysteresis loop,energy absorption and loss factor,for two loading level,are ***,the behaviour of this sandwich composite with re-entrant honeycomb core is compared with that of sandwiches with different core *** results show that sandwich with high core density dissipate more energy,which results higher loss *** determined properties offer the most sensitive indicators of sandwich composite damage during its *** work aims to determine the static and fatigue properties of this material,thus,study its potential applications in industry.

关键词： Auxetic structure fatigue damping bio-sandwich composite 3D printing

Analysis of promoter activity reveals that GmFTL2 expression differs from that of the known Flowering Locus T genes in soybean

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The Crop Journal 2017年第5期5卷 438-447页

作者： Limin Liu Xiaomei Zhang Fulu Chen Asia Adam Elzamzami mahi.Xiaoxia Wu Qingshan Chen Yong-Fu Fu College of Agriculture Northeast Agricultural University MOA Key Lab of Soybean Biology (Beijing) National Key Facility for Crop Gene Resources and Genetic Improvement Institute of Crop ScienceChinese Academy of Agricultural Sciences

Regulation of flowering is one of the key issues in crop yield. The Floiuering Loews T(FT) gene is a well-known florigen, which integrates various signals from multiple flowering-regulation pathways to initiate flowering. We previously reported that there are at least six FT genes(GmFTLl-6) in soybean displaying flowering activity. However, the individual functions of genes GmFTLl-6 remain to be identified. In this study, we cloned the GmFTL2 promoter(GmFTLpro) from soybean(Glycine max) cultivar Tianlong 1 and analyzed its motifs bioinformatically and its expression patterns using both a transgenic approach and quantitative RT-PCR(qRT-PCR). In GmFTLpro::GUS transgenic lines, GUS signals were enriched in cotyledons, hypocotyledons, pollen, embryos, and root tips in a photoperiod-independent manner. qRT-PCR confirmed the GUS reporter results. Our results suggest that GmFTL2 expression is regulated by developmental and tissue-specific clues and plays roles in seedling establishment and the development of micro game tophytes, embryos, and roots.

关键词： Flowering Locus T Cotyledon Microgametophyte Embryo Root tip

Crystal structure of Q156A trichosanthin

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Chinese Science Bulletin 1997年第16期42卷 1366-1369页

作者： Dong, YC Zhu, yr Cheng, SH Li, JH Shaw, PC Chinese Acad Sci Inst Biophys Beijing 100101 Peoples R China Chinese Univ Hong Kong Dept Biochem Hong Kong Hong Kong Peoples R China

RIBOSOME inactivating proteins (RIPs) are a group of toxin with RNA N-glycosidase. It

关键词： mutant crystal structure trichosanthin.