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Enhancing sustainability in phosphate ore processing:Performance of frying oil as alternative flotation collector for carbonate removal

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International Journal of Mining Science and Technology 2024年第4期34卷 557-571页

作者： Asmae el-bahi yassine Taha yassine Ait-Khouia Abdellatif elghali Mostafa Benzaazoua Geology&Sustainable Mining Institute(GSMI) Mohammed VI Polytechnic UniversityBen Guerir 43150Morocco

Recycling waste frying oils for the synthesis of flotation reagents presents a promising avenue for sustainable waste ***,it offers a cost-effective solution for crafting a specialized collector designed to efficiently remove carbonates and enhance phosphate enrichment in froth flotation *** study focuses on the synthesis of an anionic collector using the saponification reaction of a frying oil sample,subsequently applied to the flotation of calcite and *** elucidate the adsorption mechanisms of the frying oil collector(FrOC)and sodium oleate,a reference collector,on fluorapatite,calcite,dolomite,and quartz surfaces,comprehensive experiments were conducted,including zeta potential measurements and Fourier transform infrared *** revealed diverse adsorption affinities of the molecules towards these *** assess the practical performance of the collector,flotation tests were conducted using a natural phosphate ore mixture,employing a BoxBehnken experimental ***,under optimized conditions(pH 9,1000 g/t of FrOC,3.5 min of conditioning,and 6 min of flotation),FrOC exhibited excellent performance,with calcite and dolomite recoveries exceeding 80%,while apatite recovery in the concentrate fraction remained below 10%.This work exemplifies both circular economy practices and the distinctive approach to sustainable mineral processing.

关键词： Frying oils recycling Phosphate beneficiation Flotation separation Green surfactants Sustainability

Optimizing solar energy efficiency with an improved hill-climbing maximum power point tracking control approach: hardware implementation

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Clean Energy 2024年第5期8卷 167-176页

作者： yassine el Alami elmostafa Chetouani Hamza Mokhliss Fatima Ouerradi Mohssin Aoutoul Said Bounouar Rachid Bendaoud Ahmed Faize Redouane Rmaily Laboratory of electronics Instrumentation and EnergeticFaculty of SciencesChouaïb Doukkali UniversityB.P 20El JadidaMorocco Laboratory ElectronicsInstrumentation and EnergyExploitation and Processing of Renewable EnergyDepartment of PhysicsFaculty of SciencesUniversity of Chouaïb DoukkaliEl JadidaMorocco STIC Lab. Department of PhysicsChouaïb Doukkali UniversityEl JadidaMorocco Complex Cyber Physical Systems Laboratory National Higher School of Arts and CraftsHassan II UniversityCasablancaMorocco Interdisciplinary Laboratory for Research in Science Educationand TrainingHigher School of Education and Training-BerrechidHassan First UniversityBerrechidMorocco Department of Physics Polydisciplinary FacultyUniversity of Mohamed PremierNadorMorocco

This article implements maximum power point tracking(MPPT)based on the improved hill-climbing algorithm for photovoltaic(PV)systems feeding resistive loads.A direct current-to-direct current boost converter is inserted between the PV system and the load to achieve *** converter is managed using MPPT based on the hill-climbing *** objective of this paper is to optimize the code program to achieve the best compromise between accuracy and rapidity by implementing this algorithm using a *** PV systems are tested under identical meteorological *** the first,an improved hill-climbing MPPT controller is used whereas,in the second,the conventional version is *** experimental results obtained show a signifi-cant enhancement in terms of speed for the improved algorithm with a value of 0.4 s for the response time and 3%for the oscillation power;those values remain satisfactory in terms of precision of the algorithm compared with the conventional system studied and the compared algorithm from the literature.

关键词： DC/DC boost converter hardware implementation improved hill climbing MPPT photovoltaic system

Phytochemistry of the essential oil of Melissa officinalis L. growing wild in Morocco: preventive approach against nosocomial infections

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Asian Pacific Journal of Tropical Biomedicine 2015年第6期5卷 456-459页

作者： Zineb Jalal yassine el Atki Badiaa Lyoussi Abdelfattah Abdellaoui Laboratory of Physiology Pharmacology and Environmental Health Department of Biology Faculty of Sciences Dhar Mehraz University Sidi Mohamed Ben AbdellahB.P. 1796 Atlas Fez Morocco

Objective: To determine the phytochemical characterization and antibacterial activity of Melissa oi cinalis essential oil against bacteria responsible for nosocomial ***: The phytochemical characterization of essential oil was evaluated using gas chromatography-flame ionization detector and gas chromatography-mass spectrometer analysis. Antibacterial activity of the oil was tested against four bacterial strains responsible for nosocomial infections: Pseudomonas aeruginosa, Klebsiella pneumonia, Staphylococcus aureus and Citrobacter koseri using disc dif usion ***: Thirty three components were identified representing 89.30% of the total oil composition. The yield of essential oil was 0.4% and the predominant components were citronellal(14.40%), isogeraniol(6.40%), geraniol acetate(10.20%), nerol acetate(5.10%), caryophyllene(8.10%) and β-caryophyllene oxide(11.00%). Antibacterial activity of the oil showed the higher activity against all bacterial strains ***: The essential oil extracted from lemon balm can be used to clean the environment of reanimation polyvalent and anesthesia service.

关键词： Melissa officinalis Essential oils Antibacterial activity Nosocomial infections

Chemical composition and larvicidal activity of essential oil of Origanum majorana(Lamiaceae) cultivated in Morocco against Culex pipiens(Diptera:Culicidae)

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Asian Pacific Journal of Tropical Biomedicine 2014年第9期4卷 746-750页

作者： Fouad el-Akhal Abdelhakim el Ouali Lalami yassine Ez Zoubi Hassane Greche Raja Guemmouh Regional Diagnostic Laboratory Epidemiological and Environmental Hygiene Regional Health DirectorateEL Ghassani HospitalFezMorocco Sidi Mohamed Ben Abdellah University Faculty of Sciences Dhar El MahrazLaboratory Analysis and Modelling of Ecosystems ContinentalsFezMorocco National Institute of Medicinal and Aromatic Plants Sidi Mohamed Ben Ahdellah University.FezMorocco

Objective:To evaluate the larvicidal activity of essential oil of Origanum mtijoruna(Lamiaceae)cultivated in Morocco against Culex pipiens(Diptera:Culicidae).Methods:The analysis and the identification of the various constituents of essential oil were carried out by gas chromatography coupled with mass *** test was performed according to a standard methodology inspired by the World Health Organization protocol with slight ***:This oil mainly consisted of monoterpene and *** majority compounds are 4-terpinene(28.96%),y-terpinene(18.57%),α-terpinene(12.72%) and sabinene(8.02%).The lethal concentrations(LC_(50) and LC_(90)) measured for the essential oil Origanum majorana,were respectively of the order of 258.71 mg/L and 580.49 mg/***:The results could be useful in search for newer,safer,and more effective natural larvicidal agents.

关键词： Essential oil Origanum majorana Culex pipiens Larvicidal activity Morocco Fez

Dynamic characterization of a stochastic SIR infectious disease model with dual perturbation

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International Journal of Biomathematics 2021年第4期14卷 1-26页

作者： Driss Kiouach yassine Sabbar LPAIS Laboratory Faculty of Sciences Dhar El Mahraz Sidi Mohamed Ben Abdellah UniversityFezMorocco

Environmental perturbations are unavoidable in the propagation of infectious *** this paper,we introduce the stochasticity into the susceptible-infected recovered(SIR)model via thc^parameter perturbation *** stochastic disturbances associated with the disease transmission coefficient and the mortality rate are presented with two perturbations:Gaussian white noise and Levy jumps,*** idea provides an overview of disease dynamics under different random perturbation *** using new techniques and methods,we study certain interesting asymptotic properties of our perturbed model,namely:persistence in the mean,ergodicity and extinction of the *** illustrative purposes,numerical examples are presented for checking the theoretical study.

关键词： SIR epidemic model white noise Levy noise stationary distribution persistence extinction

An Output Stabilization Problem of Distributed Linear Systems Approaches and Simulations

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Intelligent Control and Automation 2012年第2期3卷 159-167页

作者： el Hassan Zerrik yassine Benslimane Department of Mathematics and Computer Science Faculty of ScienceUniversity of Moulay IsmailMeknesMorocco

The goal of this paper is to study an output stabilization problem: the gradient stabilization for linear distributed systems. Firstly, we give definitions and properties of the gradient stability. Then we characterize controls which stabilize the gradient of the state. We also give the stabilizing control which minimizes a performance given cost. The obtained results are illustrated by simulations in the case of one-dimensional distributed systems.

关键词： Distributed System Gradient Stability Gradient Stabilization Stabilizing Control

Thermal performance of lightweight concrete applications in building envelopes in Lebanon

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Building Simulation 2021年第5期14卷 1359-1375页

作者： Emilio Sassine elias Kinab yassine Cherif Emmanuel Antczak Michel Nasrallah Lebanese University Habitat and Energy UnitGroup of Thermal and Renewable Energies-Laboratory of Applied Physics(LPA-GMTER)Faculty of SciencesFanar CampusLebanon Lebanese University Faculty of EngineeringRoumiehEl MetnLebanon Univ.Artois ULR4515Laboratoire de Genie Civil et geo-Environnement(LGCgE)BethuneF-62400France CC Technique Memari StreetHamraBeirutLebanon

Innovative building materials are being used in building envelopes for reducing their heating and cooling *** paper aims to assess the thermal impact of using lightweight concrete in Lebanese building constructions by pouring an 8 cm thickness of lightweight concrete on the roof and the slab and replacing traditional hollow concrete block by lightweight concrete *** properties of two different samples were experimentally determined:the first one(558 kg/m^(3))used for the roof and the slab and the second one(1074 kg/m^(3))used for the *** numerical simulations were carried out for a Lebanese traditional detached house using the characteristics of these two *** thermally improved Light Weight Concrete building(LWC)was compared to a traditional Lebanese house base case(BC)using a dynamic building energy simulation tool in the four different Lebanese climate zones:coastal,mid-mountain,mountain,and inland *** results highlight the effectiveness of integrating LWC to building envelopes by reducing energy consumption and improving thermal comfort in both winter and summer climate conditions and in the different Lebanese climatic *** paper demonstrates that the use of LWC in the vertical walls replacing the traditional hollow blocks can reduce the heating needs by up to 9%and by up to 13%for cooling *** the other hand,adding a LWC roof screed has a very high impact on cooling and heating energy consumption,which can reach up to 74%in cooling energy savings and up to 24%in heating energy savings.

关键词： lightweight concrete thermal properties building energy simulation thermal insulation climatic conditions

Microwave Transmission Through One-Dimensional Hybrid Quasi-Regular （Fibonacci and Thue-Morse）/ Periodic Structures

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Photonic Sensors 2013年第3期3卷 246-255页

作者： Youssef TRABelSI Naim BENALI yassine BOUAZZI Mounir KANZARI LPMS Laboratory of Photovoltaic and Semi-conductor Materials ENIT EL Manar University ENIT-BP 37 Belvedere 1002 Tunis Tunisia

The transmission properties of hybrid quasi-periodic photonic systems （HQPS） made by the combination of one-dimensional periodic photonic crystals （PPCs） and quasi-periodic photonic crystals （QPCs） were theoretically studied. The hybrid quasi-periodic photonic lattice based on the hetero-structures was built from the Fibonacci and Thue-Morse sequences. We addressed the microwave properties of waves through the one-dimensional symmetric Fibonacci, and Thue-Morse system i.e., a quasi-periodic structure was made up of two different dielectric materials （Rogers and air）, in the quarter wavelength condition. It shows that controlling the Fibonacci parameters permits to obtain selective optical filters with the narrow passband and polychromatic stop band filters with varied properties which can be controlled as desired. From the results, we presented the self-similar features of the spectra, and we also presented the fractal process through a return map of the transmission coefficients. We extracted powerfully the band gaps of hybrid quasi-periodic multilayered structures, called ＂pseudo band gaps＂, often containing resonant states, which could be considered as a manifestation of numerous defects distributed along the structure. The results of transmittance spectra showed that the cutoff frequency could be manipulated through the thicknesses of the defects and the type of dielectric layers of the system. Taken together, the above two properties provide favorable conditions for the design of an all-microwave intermediate reflector.

关键词： Photonic crystals aperiodic sequence quasi-periodic photonic band gap Thue-Morse class quasi-periodic Fibonacci class quasi-periodic microwave reflector

29% P<sub>2</sub>O<sub>5</sub>Phosphoric Acid Desulphation: Improving the Performance of the Unit of Concentration

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American Journal of Analytical Chemistry 2019年第3期10卷 65-75页

作者： Abderrahmane Aboulhassane Abderrahim Najah el Idrissi yassine Bounou Driss Zakaria Laboratory of Physical Chemistry of Materials (LPCM) Department of Chemistry Faculty of Science Choua&iuml b Doukkali University El Jadida Morocco

Clogging in the heat exchangers of the phosphoric acid concentration unit is a phenomenon which hinders the proper functioning of the installation. It results in the accumulation of undesirable solid deposits on the pipes and consequently a decrease of its performance. This deposit is mainly anhydrous or hemihydrate gypsum in addition to Na2SiF6. Phosphoric acid desulphation before its concentration step allows reducing this undesirable effect. Barium carbonate is used for the retention of sulphate ions using a simple experimental protocol which can easily be inserted into the phosphoric acid manufacturing. Four factors: quality of the phosphoric acid to be concentrated, amount of barium carbonate, temperature and time, were studied using design of experiment (DOE) methodology with two-level full factorial design strategy in order to assess their effects on desulphation. Only the first two factors have significant effects. Therefore, for effective sulphate removal, the validated statistical model (R2 = 99.96%) allows to predict the amount of barium carbonate to be used, depending on quality of the phosphoric acid to be concentrated and using the available temperature and time in the industrial process.

关键词： Phosphoric Acid Barium Carbonate Desulphation Protocol Modeling Full Factorial Design