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Modern improvement techniques of direct torque control for induction motor drives - a review

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Protection and Control of Modern Power Systems 2019年第1期4卷 138-149页

作者： Najib el Ouanjli Aziz Derouich Abdelaziz el Ghzizal Saad Motahhir Ali Chebabhi youness el mourabit Mohammed Taoussi Laboratory of Production Engineering Energy and Sustainable DevelopmentHigher School of TechnologySidi Mohamed Ben Abdellah UniversityFezMorocco Faculty of Sciences and Technology University of Bordj Bou ArreridjBordj Bou ArreridjAlgeria Laboratory of Systems Integration and Advanced Technologies Faculty of Sciences Dhar El MahrazSidi Mohamed Ben Abdellah UniversityFezMorocco

Conventional direct torque control (DTC) is one of the excellent control strategies available to control the torque of the induction machine (IM). However, the low switching frequency of the DTC causes high ripples in the flux and torque that leads to an acoustic noise which degrades the control performances, especially at low speeds. Many direct torque control techniques were appeared to remedy these problems by focusing specifically on the torque and flux. In this paper, a state of the art review of various modern techniques for improving the performance of DTC control is presented. The objective is to make a critical analysis of these methods in terms of ripples reduction, tracking speed, switching loss, algorithm complexity and parameter sensitivity. Further, it is envisaged that the information presented in this review paper will be a valuable gathering of information for academic and industrial researchers.

关键词： Induction machine Direct torque Control(DTC) Fuzzy logic(FL) Neural network(NN) Sliding mode(SG) Genetic algorithm(GA)

Advancements,strategies,and prospects of solid oxide electrolysis cells(SOECs):Towards enhanced performance and large-scale sustainable hydrogen production

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Journal of Energy Chemistry 2024年第7期94卷 688-715页

作者： Amina Lahrichi youness el Issmaeli Shankara S.Kalanur Bruno G.Pollet Green Hydrogen Lab(GH2Lab) Hydrogen Research Institute(HRI)Universitédu QuébecàTrois-Rivières(UQTR)3351 boulevard des ForgesTrois-RivièresQuébec G9A 5H7Canada

Solid oxide electrolysis cells(SOECs)represent a crucial stride toward sustainable hydrogen generation,and this review explores their current scientific challenges,significant advancements,and potential for large-scale hydrogen *** SOEC technology,the application of innovative fabrication tech-niques,doping strategies,and advanced materials has enhanced the performance and durability of these systems,although degradation challenges persist,implicating the prime focus for future *** we provide in-depth analysis of the recent developments in SOEC technology,including Oxygen-SOECs,Proton-SOECs,and ***,Hybrid-SOECs,with their mixed ionic conducting electrolytes,demonstrate superior efficiency and the concurrent production of hydrogen and *** with the capacity to harness waste heat,these advancements in SOEC technology present signif-icant promise for pilot-scale applications in *** review also highlights remarkable achieve-ments and potential reductions in capital expenditure for future SOEC systems,while elaborating on the micro and macro aspects of sOECs with an emphasis on ongoing research for optimization and *** concludes with the potential of SOEC technology to meet various industrial energy needs and its significant contribution considering the key research priorities to tackle the global energy demands,ful-fillment,and decarbonization efforts.

关键词： Solid oxide electrolysis cells Proton-SOECs Oxygen-SoECs Hybrid-SOECs Intermediate-high temperature electrolysers Hydrogenproduction

Association of vitamin D receptor gene polymorphism(VDR)with vitamin D deficiency,metabolic and inflammatory markers in Egyptian obese women

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Genes & Diseases 2017年第3期4卷 176-182页

作者： Moushira Zaki Sanaa Kamal Walaa ABasha Eman youness Wafaa Ezzat Hala el-Bassyouni Khalda Amr Biological Anthropology Department National Research CentreGizaEgypt Medical Biochemistry Department National Research CentreGizaEgypt Internal Medicine Department National Research CentreGizaEgypt Clinical Genetics Department National Research CentreCairoEgypt Medical Molecular Genetics Department National Research CentreEgypt

Vitamin D deficiency might contribute to the pathogenesis of metabolic syndrome and could cause immune *** aim of this study is to analyze the associations between Vitamin D receptor(VDR)gene polymorphism,serum 25-hydroxy vitamin D,metabolic and inflammatory biomarkers in Egyptian obese *** study included 201 obese women with vitamin D deficiency and 249 obese matched age healthy controls with sufficient vitamin D *** age ranged between 25 and 35 *** biomarkers(interleukin-6 and C-reactive protein)and serum 25(OH)D were measured by enzyme-linked immunosorbent *** resistance(IR)was determined by the homeostasis model assessment of insulin resistance(HOMA-IR).Vitamin D receptor(VDR)gene polymorphisms of FokI,ApaI,and TaqI were studied by PCR using the restriction fragment length polymorphism(RFLP)*** women with vitamin D deficiency had significant higher values of inflammatory and metabolic parameters compared to ***-logistic regression showed associations between 25(OH)D deficiency and metabolic components when comparing cases with ***,cases carrying polymorphic alleles showed significant lower levels of serum 25(OH)D and higher HOMA-IR,blood pressure levels and lipid parameters compared to those with the wild type homozygote in obese cases with vitamin D *** D deficiency in Egyptian obese women with vitamin D deficiency is associated with abnormal metabolic components and abnormal inflammatory ***,VDR polymorphisms play important role in immune and inflammation status.

关键词： Inflammatory biomarkers Obese women Vitamin D deficiency Vitamin D receptor(VDR)gene polymorphism Egyptian

Apatite phosphate doped by cobalt as hight efficient catalyst of multi-component synthesis of therapeutic spiropyrimidine compound

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Natural Products and Bioprospecting 2022年第1期12卷 567-572页

作者： Abdallah Rhihil youness Aichi Mohamed Zahouily Saïd Sebti Mohamed el Guendouzi Laboratory of Chemistry Physics Materials and Catalysis(LCPMC) Faculty of Sciences Ben M’sik of CasablancaHassan II University of CasablancaCasablancaMorocco Financial Engineering Governance and Development LaboratoryNational School of Business and Management of CasablancaHassan II University of CasablancaCasablancaMorocco Laboratory of Materials Catalysis and Valorization of Natural ResourcesFaculty of Sciences and Technology of MohammediaHassan II University of CasablancaCasablancaMorocco

Spiropyrimidines vanquish a significant situation in the field of heterocyclic chemistry, they are broadly utilized as an antibacterial, an inhibitor of multidrug opposition, or an antiplatelet and antithrombotic drug. Phosphate, the principal Moroccan mineral wealth occupies a vital spot in the economic sector and its valuation is a goal continually looked for. Among the conceivable outcomes of valorization, its utilization in heterogeneous catalysis which thought about an exceptionally encouraging new way. In this context, the focus on the reaction of the synthesis of spiropy-rimidine, catalyzed by natural phosphate (NP) and by fluoroapatite (Fap), are used alone or doped by cobalt. These phosphate catalysts were characterized by XRD, IR and SEM, while the synthesized spiropyrimidine was identified by IR, GC-MS and NMR. The obtained yield with fluorapatite doped by cobalt (Co/Fap), at room temperature in ethanol is very high and shows a high impact performance induced by a synergistic effect compared to that of NP alone.

关键词： Spiropyrimidine Natural phosphate Co/Fap Heterogeneous catalysis Multicomponent reaction

Review on nanocomposites fabricated by mechanical alloying

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International Journal of Minerals,Metallurgy and Materials 2019年第9期26卷 1047-1058页

作者： Mohammed A. Taha Rasha A. youness M.F. Zawrah Solid State Physics Department National Research CentreEl Buhouth St.Dokki 12622CairoEgypt Spectroscopy Department National Research CentreEl Buhouth St.Dokki 12622CairoEgypt Refractories Ceramics and Building Material DepartmentNational Research CentreEl Buhouth St.Dokki 12622CairoEgypt

Composites are composed of multiphase materials, where each phase has specific properties that differ from those of the other phases which can effect on the whole properties of composite. Nanocomposites are class of materials that contain at least one phase in the nanometric size range and can be produced by any suitable technique for preparing nanomaterials. Composites are an interesting class of materials that have recently been used in numerous applications, including structural, biomedical, electronics, and environmental applications. In composites, reinforcements might be fibers, particulates, or whiskers. Mechanical alloying(MA) is a promising technique for producing nanocomposite materials that are difficult or impossible to prepare via conventional techniques. In this review, we provide an overview of nanocomposites prepared by the MA process. The mechanism of milling and other milling parameters are overviewed, and insights into sintering categories and parameters are also presented.

关键词： nanocomposites mechanical alloying fabrication sintering

Serum homocysteine,lipid profile and BMI as atherosclerotic risk factors in children with numerical chromosomal aberrations

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World Journal of Pediatrics 2022年第6期18卷 443-448页

作者： Eman R.youness Sherien Mel-Daly Hanaa Reyad Abdallah Hala T.el-Bassyouni Hisham Megahed Azzah A.Khedr Marwa elhady Walaa Alsharany Abuelhamd Medical Biochemistry Department Medical Research DivisionNational Research CentreGizaEgypt Biological Anthropology Department Medical Research DivisionNational Research CentreGizaEgypt Clinical Genetics Department Human Genetics and Genome Research DivisionNational Research CentreEl-Tahrir StreetPO:12622GizaEgypt Human Cytogenetics Department Human Genetics and Genome Research DivisionNational Research CentreGizaEgypt Pediatric Department Faculty of Medicine for GirlsAl-Azhar UniversityCairoEgypt Department of Pediatrics Faculty of MedicineCairo UniversityCairoEgypt

Down syndrome,Turner syndrome,and Klinefelter syndrome are the most common chromosomal disorders *** syndrome is caused by an extra copy of the 21st chromosome and has an incidence of 1 in 800 to 1000 live *** syndrom... 详细信息

关键词： chromosomal Turner Serum

Uncoupling tumor necrosis factor-αand interleukin-10 at tumor immune microenvironment of breast cancer through miR-17-5p/MALAT-1/H19 circuit

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BIOCelL 2022年第3期46卷 769-783页

作者： RAGHDA A.SOLIMAN RANA A.youness TAMER M.MANIE EMAD KHALLAF MOHAMED el-SHAZLY MONA ABDelMOHSEN HEBA HANDOUSSA MOHAMED Z.GAD Pharmaceutical Biology Department Faculty of Pharmacy and BiotechnologyGerman University in CairoCairo11835Egypt School of Life and Medical Sciences University of Hertfordshire Hosted by Global Academic FoundationNew Administrative Capital11578Egypt Breast Surgery Department National Cancer InstituteCairo UniversityCairoEgypt General Surgery Department Faculty of MedicineCairo UniversityCairoEgypt Department of Phytochemistry National Research CentreGiza12622Egypt Biochemistry Department Faculty of Pharmacy and BiotechnologyGerman University in CairoCairo11835Egypt

Triple Negative Breast Cancer(TNBC)immunotherapy has recently shown promising ***,some TNBC patients presented with *** of the reasons was attributed to the excessive release of cytokines at the tumor microenvironment(TME)such as Tumor necrosis factor alpha(TNF-α)and Interleukin-10(IL-10).Fine regulation of these cytokines’levels via non-coding RNAs(ncRNAs)might alleviate the immune quiescent nature of TME at TNBC ***,the extrapolation of ncRNAs as therapeutic tools is highly ***,disentanglement the nature for the isolation of natural compounds that could modulate the ncRNAs and their respective targets is an applicable translational therapeutic ***,this study aimed to targeting the chief immune suppressive cytokines at the TME(TNF-αand IL-10)via ncRNAs and to examine the effects of Rosemary aerial parts extract on the expression levels of these ncRNAs in *** revealed miR-17-5p as a dual regulator of TNF-αand ***,an intricate interaction has been shown between miR-17-5p and the oncogenic lncRNAs:MALAT1 and *** down of MALAT1 and/or H19 caused an induction in miR-17-5p and reduction in TNF-αand IL-10 expression ***-17-5p was found to be down-regulated,while TNF-α,IL-10,MALAT1 and H19 were up-regulated in BC *** expression of miR-17-5p in MDA-MB-231 cells reduced TNF-α,IL-10,MALAT1 and H19 expression levels,as well as several BC *** a translational approach,ursolic acid(UA)isolated from rosemary induced the expression of miR-17-5p,MALAT1 and decreased H19 expression *** conclusion,this study suggests miR-17-5p as a tumor suppressor and an immune-activator miRNA in BC through tuning up the immunological targets TNF-α,IL-10 at the TME and the oncological mediators MALAT1 and H19 lncRNAs.

关键词： Breast cancer Tumor microenvironment Cytokines TNF-α IL-10 miR-17-5p MALAT1 H19 lncRNAs miRNA Ursolic acid

Novel neuroprotective and hepatoprorective effects of citric acid in acute malathion intoxication

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Asian Pacific Journal of Tropical Medicine 2016年第12期9卷 1157-1169页

作者： Omar M.E.Abdel-Salam Eman R.youness Nadia A.Mohammed Noha N.Yassen Yasser A.Khadrawy Safinaz Ebrahim el-Toukhy Amany A.Sleem Department of Toxicology and Narcotics National Research Centre Medical Biochemistry National Research Centre Pathology National Research Centre Physiology National Research Centre Pharmacology National Research Centre

Objective: To study the effect of citric acid given alone or combined with atropine on brain oxidative stress, neuronal injury, liver damage, and DNA damage of peripheral blood lymphocytes induced in the rat by acute malathion exposure. Methods: Rats were received intraperitoneal(i.p.) injection of malathion 150 mg/kg along with citric acid(200 or 400 mg/kg, orally), atropine(1 mg/kg, i.p.) or citric acid 200 mg/kg+atropine 1 mg/kg and euthanized 4 h later. Results: Malathion resulted in increased lipid peroxidation(malondialdehyde) and nitric oxide concentrations accompanied with a decrease in brain reduced glutathione, glutathione peroxidase(GPx) activity, total antioxidant capacity(TAC) and glucose concentrations. Paraoxonase-1, acetylcholinesterase(ACh E) and butyrylcholinesterase activities decreased in brain as well. Liver aspartate aminotransferase and alanine aminotransferase activities were raised. The Comet assay showed increased DNA damage of peripheral blood lymphocytes. Histological damage and increased expression of inducible nitric oxide synthase(i NOS) were observed in brain and liver. Citric acid resulted in decreased brain lipid peroxidation and nitric oxide. Meanwhile, glutathione, GPx activity, TAC capacity and brain glucose level increased. Brain ACh E increased but PON1 and butyrylcholinesterase activities decreased by citric acid. Liver enzymes, the percentage of damaged blood lymphocytes, histopathological alterations and i NOS expression in brain and liver was decreased by citric acid. Meanwhile, rats treated with atropine showed decreased brain MDA, nitrite but increased GPx activity, TAC, ACh E and glucose. The drug also decreased DNA damage of peripheral blood lymphocytes, histopathological alterations and i NOS expression in brain and liver. Conclusions: The study demonstrates a beneficial effect for citric acid upon brain oxidative stress, neuronal injury, liver and DNA damage due to acute malathion exposure.

关键词： Citric acid Malathion Oxidative stress Paraoxonase 1 Cholinesterase Comet assay

Bougainvillea spectabilis flowers extract protects against the rotenone-induced toxicity

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Asian Pacific Journal of Tropical Medicine 2017年第5期10卷 457-466页

作者： Omar M.E.Abdel-Salam Eman R.youness Nadia A.Ahmed Sayed A.el-Toumy Ahmed M.A.Souleman Nermeen Shaffie Dalia M.Abouelfadl Department of Toxicology and Narcotics National Research CentreCairoEgypt Department of Medical Biochemistry National Research CentreCairoEgypt Department of Chemistry of Tannins National Research CentreCairoEgypt Department of Phytochemistry and Plant Systematic National Research CentreCairoEgypt Department of Pathology National Research CentreCairoEgypt

Objective:To investigate the effect of two extracts of Bougainvillea spectabilis(B. spectabilis) flowers with yellow and pink/purple on brain oxidative stress and neuronal damage caused in rats by systemic rotenone injection. Methods:Rotenone 1.5 mg/kg was given three times per week alone or in combination with B. spectabilis flowers extracts(25 mg or 50 mg) via the subcutaneous route for 2 weeks. Brain concentrations of the lipid peroxidation marker malondialdehyde(MDA),reduced glutathione,nitric oxide(nitrite),the pro-inflammatory cytokine interleukin-1beta(Il-1β) as well as butyrylcholinesterase,and paraoxonase-1(PON-1) activities,were determined. Histopathology and caspase-3 immunohistochemistry were also performed. Results:Rotenone resulted in significant increases of brain MDA(the product of lipid peroxidation),and nitric oxide content along with decreased brain reduced glutathione. There were also marked and significant inhibition of brain PON-1 and BCh E activities and increased Il-1β in brain of rotenone-treated rats. B. spectabilis flowers extract itself resulted in brain oxidative stress increasing both lipid peroxidation and nitrite content whilst inhibiting PON-1 activity. The yellow flowers extract inhibited BCh E activity and increased brain Il-1β. When given to rotenone-treated rats,B. spectabilis extracts,however,decreased lipid peroxidation while their low administered doses increased brain GSH. Brain nitrite decreased by the pink extract but showed further increase by the yellow extract. Either extract,however,caused further inhibition of PON-1 activity while the yellow extract resulted in further inhibition of BChE activity. Histopathological studies indicated that both extracts protected against brain,liver and kidney damage caused by the toxicant. Conclusions:These data indicate that B. spectabilis flowers extracts exert protective effect against the toxic effects of rotenone on brain,liver and kidney. B. spectabilis flowers extracts decreased

关键词： Bougainvillea spectabilis Flowers Extract Rotenone Oxidative stress Parkinson’s disease