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Ali Sghaier Tlili 제어·로봇·시스템학회 2017 International Journal of Control, Automation, and Vol.15 No.4
This paper proposes developing a H∞ dynamic output-feedback decentralized control design methodfor nonlinear interconnected systems subject to time-varying parameters and external disturbances. The designedcontroller is formulated as an optimization problem subject to linear matrix inequalities (LMIs) for the concurrentcomputation of the decentralized observation and control gains, and for the external disturbance mitigation by meansof a H∞ performance criterion minimization. The propounded optimization problem, designed in LMI conditions,is expeditiously resolved by a one-step procedure to override the conservatism generated by using many step-basedprocedures often used in the analysis and synthesis of interconnected systems. The effectiveness of the developedcontrol scheme is demonstrated through simulation results of multimachine power systems.
Nesrine Sghaier,Rayda Ben Ayed,Ahmed Rebai Korea Genome Organization 2022 Genomics & informatics Vol.20 No.4
Food security will be affected by climate change worldwide, particularly in the developing world, where the most important food products originate from plants. Plants are often exposed to environmental stresses that may affect their growth, development, yield, and food quality. Auxin is a hormone that plays a critical role in improving plants' tolerance of environmental conditions. Auxin controls the expression of many stress-responsive genes in plants by interacting with specific cis-regulatory elements called auxin-responsive elements (AuxREs). In this work, we performed an in silico prediction of AuxREs in promoters of five auxin-responsive genes in Zea mays. We applied a data fusion approach based on the combined use of Dempster-Shafer evidence theory and fuzzy sets. Auxin has a direct impact on cell membrane proteins. The short-term auxin response may be represented by the regulation of transmembrane gene expression. The detection of an AuxRE in the promoter of prolyl oligopeptidase (POP) in Z. mays and the 3-fold overexpression of this gene under auxin treatment for 30 min indicated the role of POP in maize auxin response. POP is regulated by auxin to perform stress adaptation. In addition, the detection of two AuxRE TGTCTC motifs in the upstream sequence of the bx1 gene suggests that bx1 can be regulated by auxin. Auxin may also be involved in the regulation of dehydration-responsive element-binding and some members of the protein kinase superfamily.
Boubaker, Aimen,Sghaier, Nabil,Souifi, Abdelkader,Kalboussi, Adel The Institute of Electronics and Information Engin 2010 Journal of semiconductor technology and science Vol.10 No.2
In this work, we propose a single electron memory 'SEM' design which consist of two key blocs: A memory bloc, with a voltage source $V_{Mem}$, a pure capacitor connected to a tunnel junction through a metallic memory node coupled to the second bloc which is a Single Electron Transistor "SET" through a coupling capacitance. The "SET" detects the potential variation of the memory node by the injection of electrons one by one in which the drainsource current is presented during the memory charge and discharge phases. We verify the design of the SET/SEM cell by the SIMON tool. Finally, we have developed a MAPLE code to predict the retention time and nonvolatility of various SEM structures with a wide operating temperature range.
Aimen Boubaker,Nabil Sghaier,Abdelkader Souifi,Adel Kalboussi 대한전자공학회 2010 Journal of semiconductor technology and science Vol.10 No.2
In this work, we propose a single electron memory 'SEM' design which consist of two key blocs: A memory bloc, with a voltage source VMem, a pure capacitor connected to a tunnel junction through a metallic memory node coupled to the second bloc which is a Single Electron Transistor "SET" through a coupling capacitance. The "SET" detects the potential variation of the memory node by the injection of electrons one by one in which the drainsource current is presented during the memory charge and discharge phases. We verify the design of the SET/SEM cell by the SIMON tool. Finally, we have developed a MAPLE code to predict the retention time and nonvolatility of various SEM structures with a wide operating temperature range.
Sana Dardouri,Jalila Sghaier 한국화학공학회 2017 Korean Journal of Chemical Engineering Vol.34 No.4
The removal of dye from industrial wastewater is one of the most important subjects in water pollution regulation. Successive adsorption/desorption cycles of a basic dye, methylene blue, on internal almond shell, olive stone and rye straw were investigated by using fixed bed column experiments to study the adsorption capacity to remove the MB and adsorbents regeneration efficiency. The adsorption breakthrough curves were predicted by the Thomas model, Yoon Nelson model, and Wolborska model and modified dose-response model by using nonlinear regressive analysis. The adsorption capacity values obtained by this model are compared with the experimental capacity, noting an error of 16%, 27.8% and 18.9% for IAS, OS and RS respectively, but these errors are minimized in the second cycle to 22.98% and 6.06% for OS and RS respectively. The results show that the modified dose response model is more suitable for the description of breakthrough curves for three adsorbents only in the first cycle. The IAS presents the highest adsorption capacity and the best regeneration efficiency. Conversely, the RS presents lower adsorption capacity, whereas is not the hardest to regenerate.
Some Insights on Combined Turning-Burnishing (CoTuB) Process on Workpiece Surface Integrity
Anis Rami,Fathi Gharbi,Salem Sghaier,Hedi Hamdi 한국정밀공학회 2018 International Journal of Precision Engineering and Vol.19 No.1
This paper deals with a combined manufacturing process called Combined Turning-Burnishing (CoTuB) that performs turning and ball-burnishing simultaneously on the same machine tool. This innovative process aimed to enhance surface quality and integrity by exploiting rough turning conditions. Consequently, this implies an increase in productivity when compared to conventional surface treatment processes. For this reason, a device was manufactured in order to hold both commercial cutting and burnishing tools to carry out the removal material and the surface mechanical treatment processes simultaneously and under the same operation. As the design of CoTuB device sets the cutting tool ahead of the ball, turning is followed by burnishing operation along the manufactured surface. It has been depicted experimentally that a considerable improvement in surface quality could be achieved using the new combined process under suitable process parameters. Burnishing force, Ball burnishing diameter and depth of cut are independent parameters. In order to carry out a parametric process study, several experiments based on Taguchi method were performed. The aim is to identify the optimal turning/burnishing parameters when treating AISI 4140 steel. This helps to get a compromise between the optimal arithmetic surface roughness (Ra), the compressive residual stress state and the micro-hardness (μH).
Ilef Limem,Ines Bouhlel,Meriem Bouchemi,Soumaya Kilani,Jihed Boubaker,Mohamed Ben-Sghaier,Ines Skandrani,Wissem Behouri,Aicha Neffati,Kamel Ghedira,Leila Chekir-Ghedira 한국식품영양과학회 2010 Journal of medicinal food Vol.13 No.3
Four extracts were prepared from the leaves of Phlomis mauritanica: lyophilized infusion, total oligomer flavonoids, methanol, and ethyl acetate extracts. The antimutagenic properties of these extracts were investigated by assessing the inhibition of the mutagenic effects of direct-acting mutagens such as sodium azide and 4-nitrophenylenediamine and indirect-acting mutagens like aflatoxin B1 (AFB1) using the Ames assay. The four extracts prepared from P. mauritanica strongly inhibit the mutagenicity induced by AFB1 in both Salmonella typhimurium TA 100 and TA 98 assay systems. Lyophilized infusion and methanol extracts at the dose of 250μg per plate reduced AFB1 mutagenicity by 93% and 91%, respectively, in S. typhymurium strain TA 100. We examined also the antioxidant effect of these extracts by the enzymatic xanthine/xanthine oxidase assay. Result indicated that total oligomer flavonoids and ethyl acetate and methanol extracts were potent inhibitors of xanthine oxidase activity. In contrast, lyophilized infusion, total oligomer flavonoids, and methanol extracts exhibited a high degree of superoxide anion scavenging. Our findings emphasize the potential of P. mauritanica extracts to prevent mutations and oxidant effects. Furthermore, the results presented here could be an additional argument to support the use of this species as a medicinal and dietary plant.
Hiba Trad,Sourour Ayed,Larbi Rhazi,Amine Slim,Jaime A Teixeira da Silva,Raoudha Hellal,Mounira Sghaier,Hajer Slim Amara 한국식품과학회 2014 Food Science and Biotechnology Vol.23 No.5
Six Tunisian durum wheat genotypes (4 landracesand 2 improved) were evaluated for protein content, glutenstrength, rheological characteristics, and HMW-GS patternsusing a LabChip system. Variance analysis identifiedgenotypic variation. The landraces Azizi, Mahmoudi, Chili,and Arbi exhibited the highest protein concentrations andgluten contents, and best dough tenacity and extensibilityvalues. The Mahmoudi and Chili varieties had the highestprotein contents (17.06 and 17.32% dry mass, respectively). Arbi and Chili had the highest gluten contents (60.88 and60.59%, respectively). Azizi, Mahmoudi, and Chili werecharacterized by higher dough tenacity, lower doughextensibility, and a greater alveograph configuration ratioP/L. The high molecular weight glutenin subunits 6+8(Azizi and Mahmoudi) and 7+15 (Chili), coded by the Glu-B1 locus, improved gluten strength and viscoelastic doughproperties. Calculated HMW to LMW-GS ratios werewithin a narrow range of 0.17-0.29. Some genotypes havepotential to be used as parents in breeding programs.
Chatti, Ines Bouhlel,Limem, Ilef,Boubaker, Jihed,Skandrani, Ines,Kilani, Soumaya,Bhouri, Wissem,Sghaier, Mohamed Ben,Nefatti, Aicha,Mansour, Hedi Ben,Ghedira, Kamel,Chekir-Ghedira, Leila The Korean Society of Food Science and Nutrition 2009 Journal of medicinal food Vol.12 No.3
The extract enriched in total oligomer flavonoids (TOF), and the aqueous, methanol, and ethyl acetate extracts of Acacia salicina were investigated for their polyphenolic compound content, antioxidative activity in the nitro blue tetrazolium/riboflavin assay system, antibacterial activity against Gram-positive and Gram-negative bacterial reference strains, antigenotoxic activity tested with the Ames assay, and cytotoxic activity against the K562 human chronic myelogenous leukemia cell line and L1210 leukemia murine cells. TOF extract was effective at inhibiting nitro blue tetrazolium reduction by superoxide radical in a nonenzymatic $O_2^{\cdot-}$-generating system. Significant activity against bacterial reference strains Staphylococcus aureus, Enterococcus faecalis, Salmonella enteritidis, and Salmonella typhimurium was shown with all the tested extracts. These extracts significantly decreased the genotoxicity induced by sodium azide and 4-nitro-o-phenylenediamine. A pronounced cytotoxic effect on both leukemia cell lines was detected in TOF, methanolic and ethyl acetate extracts. The antioxidant, antimicrobial, antigenotoxic, and cytotoxic activities exhibited by A. salicina depended on the chemical composition of the tested extracts.