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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

Ginseng ameliorates pulmonary toxicity induced by silicon dioxide nanoparticles in rats

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Asian Pacific Journal of Tropical Biomedicine 2021年第6期11卷 254-262页

作者： Raghda A.el-Sayed Fatma M.el-Demerdash mohammed A.el-Magd Department of Environmental Studies Institute of Graduate Studies and ResearchAlexandria UniversityEgypt Department of Anatomy Faculty of Veterinary MedicineKafrelsheikh UniversityEgypt

Objective:To investigate the protective and therapeutic role of ginseng against silicon dioxide nanoparticles(SiO2NPs)-induced toxicity in the ***:Sixty male rats were divided into five groups(n=12/group);group 1 was used as a control,group 2 received ginseng,group 3 was treated with SiO2NPs,and group 4 was pretreated with ginseng one week before SiO2NPs,while group 5 was given SiO2NPs one week before supplementation with *** were treated with both ginseng and SiO2NPs orally for five ***-time PCR was used to measure gene ***,DNA damage and cell cycle changes were determined by comet assay and flow cytometry,*** study was also done to assess the effect of ginseng on SiO2NPs-induced ***:SiO2NPs increased lipid peroxidation and decreased the activities of antioxidant ***2NPs induced apoptosis in lung tissues as revealed by upregulation of Bax and caspase 3 and downregulation of Bcl-2 as well as the induction of DNA ***2NPs also caused inflammation as indicated by upregulation of the inflammation-related genes[interleukin 1 beta(IL-1β),tumor necrosis factor-alpha(TNF-α),nuclear factor kappa B(NF-κB),cyclooxygenase 2(COX2),and transforming growth factor-beta 1(TGFβ1)]as well as cell cycle arrest in the G0/G1 phase of lung ***,histopathological examination proved the biochemical and molecular perturbations that occurred due to SiO2NPs ***,ginseng alleviated SiO2NPs-induced toxicity in rat ***:Ginseng has a potent preventive and therapeutic effect and could be used in the treatment of SiO2NPs-induced pulmonary toxicity.

关键词： Silicon dioxide nanoparticles Ginseng Oxidative stress Inflammation Pulmonary toxicity

Autosomal Dominant Polycystic Kidney Disease: Epidemiological, Clinical Aspects and Predictive Factors of Poor Renal Prognosis (About 300 Cases)

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Open Journal of Nephrology 2024年第2期14卷 275-293页

作者： Rihab Dkhissi Nada el Kadiri Tarik Bouattar Loubna Benamar Naima Ouzeddoun Department of Nephrology-Dialysis-Renal Transplantation IbnSina Hospital Mohammed V University Rabat Morocco

Introduction: Autosomal dominant polycystic kidney disease (ADPKD) is a common, multisystemic, and progressive hereditary disease. It accounts for 6 to 8% of incident cases of end-stage chronic renal disease (ESRD) in developed countries. The aim of this study is to describe the predictive factors for the development of end-stage chronic kidney disease (CKD) in the course of this disease. Material and Methods: This is a retrospective, descriptive, and analytical study including 300 cases of ADPKD collected at the Nephrology Department of Ibn-Sina Hospital in Rabat over a period of 30 years (1993 to 2023). Included in the study are all patients with ADPKD meeting the ultrasound diagnostic criteria. The analysis focused on demographic, clinical, paraclinical, evolutionary data, as well as prognostic factors associated with renal function deterioration. Results: The mean age of patients at diagnosis is 51.53 +/− 17 years [16 - 93] with a male predominance. The median serum creatinine at diagnosis is 15.5 mg/l [10 - 34]. 21% of patients had ESRD (eGFR 300 mg/24h (21%). The most common cystic complication is hemorrhage (12.3%). 21.3% of patients had hepatorenal polycystic disease. In adjusted analysis, the predictive risk factors for the occurrence of ESRD were smoking (p = 0.019), anemia (p Conclusion: ADPKD can progress insidiously to ESRD. Identification and early treatment of predictive factors for poor renal prognosis could contribute to a better outcome for this disease.

关键词： ADPKD ESRD Factors of Poor Renal Prognosis Renal and Extra-Renal Manifestations

A Conservative and Monotone Characteristic Finite element Solver for Three-Dimensional Transport and Incompressible Navier-Stokes Equations on Unstructured Grids

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Communications in Computational Physics 2022年第1期31卷 224-256页

作者： Bassou Khouya Mofdi el-Amrani mohammed Seaid International Water Research Institute University Mohammed VI PolytechnicBenguerirMorocco Mathematics and Applications Laboratory FSTAbdelmalek Essaadi UniversityTangierMorocco Department of Engineering University of DurhamSouth RoadDurham DH13LEUK

We propose a mass-conservative and monotonicity-preserving characteristic finite element method for solving three-dimensional transport and incompressibleNavier-Stokes equations on unstructured grids. The main idea in the proposed algorithm consists of combining a mass-conservative and monotonicity-preserving modified method of characteristics for the time integration with a mixed finite elementmethod for the space discretization. This class of computational solvers benefits fromthe geometrical flexibility of the finite elements and the strong stability of the modi-fied method of characteristics to accurately solve convection-dominated flows usingtime steps larger than its Eulerian counterparts. In the current study, we implementthree-dimensional limiters to convert the proposed solver to a fully mass-conservativeand essentially monotonicity-preserving method in addition of a low computationalcost. The key idea lies on using quadratic and linear basis functions of the mesh element where the departure point is localized in the interpolation procedures. Theproposed method is applied to well-established problems for transport and incompressible Navier-Stokes equations in three space dimensions. The numerical resultsillustrate the performance of the proposed solver and support its ability to yield accurate and efficient numerical solutions for three-dimensional convection-dominatedflow problems on unstructured tetrahedral meshes.

关键词： Mass-conservative monotonicity-preserving modified method of characteristics fi-nite element method convection-dominated problems incompressible Navier-Stokes equations

Some Advances in Applications of Lattice Boltzmann Method for Complex Thermal Flows

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Advances in Applied Mathematics and Mechanics 2010年第5期2卷 587-608页

作者： Ridha Djebali Habib Sammouda mohammed el Ganaoui University of Tunis el-Manar FS of TunisDepartment of PhysicsLETTM1060 TunisTunisia CNRS/SPCTS UMR 6638FST of LimogesDepartment of Physics87060 LimogesFrance

Over the past two decades,there have been enormous advances in lattice Boltzmann(LB)numerical simulation and *** lattice Boltzmann method has become a practical and promising tool for many fluid problems.A majority of recent studies have relied on numerical computations of isothermal ***,much less efforts have been devoted to complex thermal flows,such as flows in porous media subjected to external magnetic force,flows with temperature-dependent *** this paper,an overview is made based on some accomplishments in these numerical *** with the paper’s sections,the state-of-the-art trend and the LBM advances in modelling and in computational aspects for specific classes of problems of major interest will be fully touched *** remarks are given and the axis of our future studies will be traced.

关键词： LB method Bifurcations and instability porous media flows plasma jets

Effect of smart sprinkler irrigation utilization on water use efficiency for wheat crops in arid regions

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International Journal of Agricultural and Biological Engineering 2014年第1期7卷 26-35页

作者： Hussein mohammed Al-Ghobari Mohamed Said Abdalla el Marazky Department of Agricultural Engineering College of Food and Agriculture Sciences King Saud UniversityRiyadh 11451Kingdom of Saudi Arabia

The smart irrigation system(SIS)developed in this research is a valuable tool for scheduling irrigation and quantifying water required by *** was implemented and tested under sprinkler irrigation system to irrigate wheat crops(YecoraRojo).Results obtained from this system were compared with the control irrigation system(CIS),whose scheduling method was based on data from an automatic weather *** indicated significant savings in applied water using the *** addition,the use of the SIS conserved 12%of irrigation water compared to CIS and obtained an economical *** water use efficiency(WUE)under SIS had generally higher values(1.64 kg/m^(3))compared to CIS(1.46 kg/m^(3)).Hence,the application of SIS technology provides significant advantages on WUE and irrigation water use efficiency(IWUE).Relatively high WUE and IWUE were found for the irrigation treatment(80%of evapotranspiration under SIS).Results showed that the irrigation requirements of wheat increased(100%of ETc under CIS)with increasing evapotranspiration(ETc)but excessive irrigation could decrease WUE and *** results indicated that extreme irrigation might not produce higher yield or optimal economic benefit,thus,suitable irrigation schedules by using SIS must be established and extendable to other agricultural crops.

关键词： smart irrigation system(SIS) sprinkler irrigation scheduling water use efficiency arid region evapotranspiration grain yield

Detection of Impending Vehicle Rollover with Road Bank Angle Consideration Using a Robust Fuzzy Observer

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International Journal of Automation and computing 2015年第1期12卷 93-101页

作者： Hamid Dahmani mohammed Chadli Abdelhamid Rabhi Ahmed el Hajjaji University of Picardie Jules Verne-MIS Laboratory (EA4290) 33 rue Saint-Leu Amiens 80039 France

This article describes a method of vehicle dynamics estimation for impending rollover detection. We estimate vehicle dynamic states in presence of the road bank angle as a disturbance in the vehicle model using a robust observer. The estimated roll angle and roll rate are used to compute the rollover index which is based on the prediction of the lateral load transfer. In order to anticipate rollover detection, a new method is proposed to compute the time to rollover(TTR) using the load transfer ratio(LTR). The nonlinear model, deduced from the vehicle lateral and roll dynamics, is represented by a Takagi-Sugeno(T-S) fuzzy model. This representation is used to account for the nonlinearities of lateral cornering forces. The proposed T-S observer is designed with unmeasurable premise variables to cater for non-availability of the slip angles measurement. The proposed approach is evaluated using Car Sim simulator under different driving scenarios. Simulation results show good efficiency of the proposed T-S observer and the rollover detection method.

关键词： Vehicle rollover vehicle dynamics Takagi-Sugeno(T-S) fuzzy model observer uncertainties Lyapunov method linear matrix inequalities(LMI)

Direct torque control of doubly fed induction motor using three-level NPC inverter

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Protection and Control of Modern Power Systems 2019年第1期4卷 208-216页

作者： Najib el Ouanjli Aziz Derouich Abdelaziz el Ghzizal mohammed Taoussi Youness el Mourabit Khalid Mezioui Badre Bossoufi Laboratory of Production Engineering Energy and Sustainable DevelopmentHigher School of TechnologySidi Mohamed Ben Abdellah UniversityFezMorocco Laboratory of Systems Integration and Advanced Technologies Faculty of Sciences Dhar El MahrazSidi Mohamed Ben Abdellah UniversityFezMorocco Laboratory of electrical Engineering and Maintenance ESTO School of TechnologyUniversity Mohammed IOujdaMorocco

This article presents the direct torque control (DTC) strategy for the doubly fed induction motor (DFIM) connected to two three-level voltage source inverters (3LVSIs) with neutral point clamped (NPC) structure. This control method allows to reduce the torque and flux ripples as well as to optimize the total harmonic distortion (THD) of motor currents. The use of 3LVSI increases the number of generated voltage, which allows improving the quality of its waveform and thus improves the DTC strategy. The system modeling and control are implemented in Matlab/Simulink environment. The analysis of simulation results shows the better performances of this control, especially in terms of torque and flux behavior, compared to conventional DTC.

关键词： Direct torque control Doubly fed induction motor Three-level inverter Ripples Switching table

Surface Nanostructure Control with Poly(ethylene glycol)(PEG)Spacer by Templateless electropolymerization

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Journal of Bionic Engineering 2021年第1期18卷 65-76页

作者： Imen Bousrih Mejda el Kateb mohammed Beji Fréderic Guittard Thierry Darmanin University of Tunis el Manar Laboratory of Structural Organic ChemistryFaculty of Sciences of TunisTunis 2092Tunisia Universite Cote d'Azur NICE LabParc Valrose Nice 06100France

Controlling the shape of surface nanostructures is fundamental for various potential applications for cxamples,in water harvesting systems,liquid transportation or oil/water separation *** this paper,the creation of porous surface structures is made by a process called templateless electropolymerization,in which water(H_(2)0)is oxidizedreduced to form gas(O_(2)/H_(2))bubbles onto the surfaces and acting as soft template for the polymer *** the monomer(thieno[3,4-b]lhiophene)and the substituent(pyrene)constant,we demonstrate how a flexible PEG spacer can affect the structure *** the PEG spacer increases,the structures change frorm nanotubes(1D growth)to nanoribbons(2D)and after to hollow nanospheres(3D),which also affeets the wettig propertics.

关键词： nanostructures wettability hydrophobicity electrochemistry bioinspiration