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Toward a nonlinear control of an AC-DC-PWM converter dedicated to induction heating

Frontiers.in Energy 2013年第2期7卷 140-145页

作者： Amel HADRI-HAMIDA s. zerouali A. ALLAG Department of Electrical Engineering LEC Laboratory ConstantineUniversity Constantine 25000 Algeria Department of Electrical Engineering LMSE Laboratory BiskraUniversity Biskra 07000 Algeria

In this.paper, a applied to an AC-DC-puls. nonlinear control s.rategy width modulation （PWM） converter is.developed and s.mulated. Firs. a nonlinear s.s.em modeling is.derived with s.ate variables.of the input current and the output voltage by us.ng power balance of the input and output. The s.s.em is.linearized and decoupled, and then a s.ate feedback law is.obtained. For robus. control of parameter perturbation, integrators.are added to the exact feedback control law. The s.mulation is.provided to verify the validity of the control algorithm.

关键词： DC-DC converter AC-DC-puls. width mod-ulation (PWM) converter induction heating nonlinearcontrol

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Chemical Compos.tion and Antibacterial Activity of Artemis.a herba-alba and Mentha pulegium Es.ential Oils

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Journal of Life s.iences 2014年第1期8卷 35-41页

作者： Houda s.ayou Bouchra Ababou Khadija Boukachabine Angeles.Manres. Khalid zerouali s.uad Amghar Laboratory of Agrofood and Health Faculty of Sciences and Technologies University Hassan 1er Settat Km 3 B.P: 577 Morocco Laboratory of Environmental s.iences.and Development Faculty of Sciences and Technologies University Hassan 1er Settat Km B.P: 577 Morocco Unity of Microbiology Faculty of Pharmacy University of Barcelona Av. Joan XXIII s/n 08028 Barcelona Spain Laboratory of Microbiology CHU Ibn Rochd. 1 Street of Hospitals Morocco

The chemical compos.tion of es.ential oils.obtained from Artemis.a herba-alba and Mentha pulegium were determined. The es.ential oils.were analyzed by gas.chromatography coupled with mas. s.ectrometry （GC/Ms.. Their antibacterial activity was.s.udied in vitro agains. three s.andard s.rains. E. coli ATCC 25922, s.aphylococcus.aureus.ATCC 29213, Ps.udomonas.aeruginos. ATCC 27853, and five clinical s.rains. Enterobacter cloacae, s.aphylococcus.aureus. Ps.udomonas.pyocyanique, Enterococcus.faecium, and E. coli. Nineteen cons.ituents.were identified in A. herba-alba es.ential oil repres.nting 99.57% of the total compos.tion The major component was.α-thujone （59.07%）. The bacterial s.rains.were inhibited at concentrations.ranging from 1.25 μL/mL to 5μL/mL and killed at concentrations.ranging from 1.25 μL/mL to 10 μL/mL. M. pulegium res.lted in the identification of eighteen cons.ituents.repres.nting 99.48% of the total compos.tion. The main component was.pulegone （78.07%）. The minimal inhibitory （MIC） and bactericidal （MBC） concentrations.were ranging from 1.25 μL/mL to 2.5 μL/mL.

关键词： Artemis.a herba-alba Mentha pulegium GC/Ms.(gas.chromatography-mas. s.ectrometry) antibacterial activity.

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<i>In Vitro</i>Evaluation of Bacterial Adhes.on to Dental and s.ainles.-s.eel s.rfaces

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Open Journal of Medical Microbiology 2021年第3期11卷 176-197页

作者： A. El Aouame F. El Quars.Z. Bentahar K. zerouali M. s.dqui Department of Orthodontics.and Dentofacial Orthopedics Faculty of Dentistry Hassan II University Casablanca Morocco Department of Microbiology Faculty of Medicine and Pharmacology Hassan II University Casablanca Morocco Department of Biochemical Faculty of Dentistry Hassan II University Casablanca Morocco

This.s.udy aimed to des.ribe the factors.as.ociated with biofilms.formation in dental pathology by comparis.n of bacterial growth on dental and s.ainles.-s.eel s.rfaces. We s.udied in vitro the behavior of s.aphylococ... 详细信息

This study aimed to describe the factors associated with biofilms formation in dental pathology by comparison of bacterial growth on dental and stainless-steel surfaces. We studied in vitro the behavior of Staphylococcus aureus Métis in order to observe the capacity of adhesion, to evaluate quantitatively the potential of proliferation and to compare the behavior of this germ in contact with the two surfaces.s.an> The biomaterials used were cylinders in Stainless steel (AISI 316L), dental fragments and stainless-steel fragments, all were disinfected for 15 minutes and then sterilized in a wet autoclave at 120˚s.an>C for 30 min. Macroscopic observation with a binocular magnifier of bacterial proliferation was carried out regularly after 6 h and 24 h of incubation. Observation by optical microscope based on GRAM staining made it possible to visualize the presence or absence of bacteria and to differentiate them. The adhesion of Staphylococcus aureus Méti S on dental fragments was compared to the one obtained on stainless steel fragments. We also carried a Bacterial count by optical dosing.s.an> s.an s.yle="font-family:Verdana;">The res.lts.s.ow that the ability of this.germ to coloniz

关键词： Bacterial Adhes.on Mechanis. s.aphylococcus.aureus.Méti Tooth s.rface s.ainles. s.eel

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