18 results on '"A. Soukeur"'
Search Results
2. Aortic isthmus massive calcifications: an unusual case of secondary hypertension
- Author
-
Soukeur, Sadia, Cosset, Benoit, and Farhat, Fadi
- Published
- 2023
- Full Text
- View/download PDF
3. Auto-combustion designed BiFeO3/Bi2O3 photocatalyst for improved photodegradation of nitrobenzene under visible light and sunlight irradiation
- Author
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Ministère de l'Enseignement Supérieur et de la Recherche Scientifique (Algerie), Université Mohamed Khider Biskra, Mazouzi, Djamel Eddine, Djani, Fayssal, Soukeur, Abderraouf, Bouchal, Wissam, Manseri, Amar, Derkaoui, Khaled, Martínez Arias, Arturo, Ksouri, Ahlem, Şen, Fatih, Kaci, Mohamed Mehdi, Ministère de l'Enseignement Supérieur et de la Recherche Scientifique (Algerie), Université Mohamed Khider Biskra, Mazouzi, Djamel Eddine, Djani, Fayssal, Soukeur, Abderraouf, Bouchal, Wissam, Manseri, Amar, Derkaoui, Khaled, Martínez Arias, Arturo, Ksouri, Ahlem, Şen, Fatih, and Kaci, Mohamed Mehdi
- Abstract
[EN] Herein, using the auto-combustion method, a BiFeO/BiO composite was successfully synthesized for the photocatalytic degradation of nitrobenzene under visible illumination. The compound was subsequently characterized using varied characterization approaches, including XRD, SEM/EDS, FTIR, XPS, and UV–VIS techniques. The photocatalytic capability of the resulting sample was assessed by removing nitrobenzene (NB) under solar and artificial (15 W LED lamp) exposure. Within 180 and 240 min of exposure, the prepared BiFeO/BiO composite exhibited impressive photocatalytic ability with quasi-total elimination (100%) of NB under both solar and LED lights, in contrast to pure oxides. The photocatalytic capability of BiFeO/BiO was 2.88 and 1.67 folds higher than those of BiFeO and BiO. This was linked to the effective charge splitting occurring at the BiFeO/BiO interface and the lower recombination ratio of charge carriers. Additionally, BiFeO/BiO exhibited outstanding sustainability without loss of activity during the first 5 cycles. Aside from this, quenching investigation showed that OH was responsible for the degradation process. Furthermore, total organic carbon (TOC) analysis confirmed NB mineralization. Based on these previous findings, an appropriate mechanism for NB decomposition was established. Overall, the BiFeO/BiO photocatalyst is recommended for use in the efficient photocatalytic removal of organic contaminants owing to its straightforward manufacturing approach, high levels of degradation, and strong structure for potential uses.
- Published
- 2024
4. Geotechnical Characterization of Phosphate Mining Waste Materials for Use in Pavement Construction
- Author
-
Rachida Malaoui, El Haddi Harkati, Mohamed Redha Soltani, Adel Djellali, Abderraouf Soukeur, and Rabah Kechiched
- Abstract
Waste rock materials are becoming widely used in road pavement and building constructions in many countries. In this work, experimental laboratory tests were carried out on the waste rock produced from the extraction of the phosphate in the Kef-Essenoun mine, to study the performance of road pavement foundations built with these types of material. Two types of waste, namely phosphatic limestone (type 1) and limestone (type 2), were initially tested to determine the most suitable one to be used in pavement structures. The characterization tests showed that the presence of carbonate-fluorapatite and carbonate-fluorapatite, and calcite, dolomite, and quartz are predominant in phosphatic limestone and limestone, respectively. The Los Angeles Abrasion (LA) and Micro-Deval (MD) values range from 59.9% to 90.4% and 42.05% to 86.31% for phosphatic limestone and from 43.64% to 95.88% and 38.25% to 75% for limestone. The CBR values of type 1 and type 2 waste were found to be 10.5% and 18.7% respectively. The results show that these materials, classified as B42ts and B42s respectively, could be used cautiously in capping layers and pavement backfilling materials. Furthermore, they must be treated with a hydraulic binder such as cement in order to improve their physical and mechanical properties.
- Published
- 2023
5. Physical and photo-electrochemical properties of MgFe2O4 prepared by sol gel route: application to the photodegradation of methylene blue
- Author
-
Hammache, Z., Soukeur, A., Omeiri, S., Bellal, B., and Trari, M.
- Published
- 2019
- Full Text
- View/download PDF
6. Physical and photo-electrochemical properties of MgFe2O4 prepared by sol gel route: application to the photodegradation of methylene blue
- Author
-
Mohamed Trari, Z. Hammache, A. Soukeur, B. Bellal, and S. Omeiri
- Subjects
Materials science ,Spinel ,Analytical chemistry ,Activation energy ,engineering.material ,Condensed Matter Physics ,Polaron ,Atomic and Molecular Physics, and Optics ,Electronic, Optical and Magnetic Materials ,Dielectric spectroscopy ,Crystal field theory ,engineering ,Crystallite ,Electrical and Electronic Engineering ,Thermal analysis ,Photodegradation - Abstract
The spinel MgFe2O4 synthesized by sol gel method, was characterized by physical and electrochemical methods. The thermal analysis (TG) gives an optimal synthesis temperature of 650 °C where the X-ray diffraction pattern exhibits a single phase crystallizing in a cubic symmetry (Space Group: Fd $$\stackrel{-}{3}$$ m) with spherical crystallites (~ 0.45 µm). The morphology observed through the SEM image shows elliptical and spherical grains of ~ 0.8 µm. The spinel possesses a direct optical transition (2.16 eV) due to electrons transfer Fe3+: d−d transition, coming from the crystal field splitting in agreement with the red color. The low electrons mobility is assigned to a narrow conduction band of Fe3+: 3d parentage with activation energy (0.14 eV) in conformity with a conduction mechanism by small polaron hopping. The semi-logarithmic plot confirms the chemical stability of oxide. Unlike other spinels, the capacitance plot exhibits n type conduction confirmed by chrono-amperometry with a flat band potential (Efb) of 0.27 V. The electrochemical impedance spectroscopy displays a semi-circle attributed to the bulk behavior. As application, the photodegradation of methylene blue (10 mg L− 1) was successfully on the spinel suspension; 87% are eliminated after 2 h of exposure to sunlight irradiation.
- Published
- 2019
7. Marketing Information System as a Marketing Crisis Management Mechanism Through Big Data Analytics: A Case Study of Algeria Telecom in Bouira
- Author
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Fatima Zohra Soukeur and Rabah Ghazi
- Subjects
business.industry ,Big data ,Marketing information system ,Crisis management ,Marketing ,business ,Mechanism (sociology) - Abstract
This chapter aims to address the marketing information system MIS and its role in the face of marketing crises, especially in light of the ongoing changes and what needs him to current information about the surrounding environment. The study concluded that the marketing information system MIS plays an active role in the management of the marketing crisis by properly exploiting the huge amount provided by big data of classified data, and stored according to a database that helps to speed the flow to allow for the response of these crises and predict.
- Published
- 2021
8. Extraction of rare earth elements from waste products of phosphate industry
- Author
-
Abderraouf Soukeur, Anthony Szymczyk, Mourad Amara, Yassine Berbar, Institut des Sciences Chimiques de Rennes (ISCR), Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Ecole Nationale Supérieure de Chimie de Rennes (ENSCR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées (INSA), Université des Sciences et de la Technologie Houari Boumediene [Alger] (USTHB), Ministry of Higher Education and Scientific Research, MHEandSRMinistère de l’Enseignement Supérieur et de la Recherche Scientifique, MESRS: 484/PNE/France/2019-2020, Université de Rennes (UR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Ecole Nationale Supérieure de Chimie de Rennes (ENSCR)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), and Université des Sciences et de la Technologie Houari Boumediene = University of Sciences and Technology Houari Boumediene [Alger] (USTHB)
- Subjects
Inorganic chemistry ,Rare earth ,Filtration and Separation ,Valorization ,02 engineering and technology ,021001 nanoscience & nanotechnology ,Phosphate ,Djebel Onk fluorapatite ,Inorganic acids ,Industrial waste ,Analytical Chemistry ,chemistry.chemical_compound ,020401 chemical engineering ,chemistry ,Liquid/liquid extraction ,Rare earths ,[CHIM]Chemical Sciences ,Industrial waste product ,Leaching (metallurgy) ,0204 chemical engineering ,0210 nano-technology ,Phosphoric acid ,Trioctylphosphine oxide - Abstract
International audience; Rare earths are critical elements in our modern societies and the ever-increasing demand raises fears of supply risks in the coming years. This work dealt with the feasibility of extracting rare earth elements (REEs) from an industrial waste product from the exploitation of phosphate ores of “Djebel Onk” in Tébessa eastern region of Algeria. The solid residue was first leached at room temperature with three different inorganic acids (HNO3, H2SO4 and H3PO4) at various concentrations and leaching times. It was possible to recover almost 100% of La, Ce, Eu, Gd and Y with HNO3 3 N in 24 h. However, only about 10% of Yb were leached. The leachates were further treated with two organophosphorous extractants, trioctylphosphine oxide (TOPO) and di-(2-ethylhexyl) phosphoric acid (D2EHPA) at various concentrations in chloroform. A virtually total extraction of Eu, Gd, Y and Yb was achieved with TOPO at 0.3 M. The extraction efficiency of light rare earth elements (LREEs), La and Ce, was only 38 and 55%, respectively. Very good selectivities between heavy rare earth elements (HREEs), and LREEs as well as between medium rare earth elements (MREEs) and LREEs were obtained but TOPO was unable to selectively separate HREEs from MREEs. Although D2EHPA led to lower REEs extraction efficiency than TOPO, it showed interesting performance for the selective separation of REEs into three fractions corresponding to LREEs (La and Ce), MREEs (Eu and Gd) and HREEs (Y and Yb).
- Published
- 2021
9. Creating an artificial neural network time series model for the prediction of daily solar radiation in Oran.
- Author
-
El Islam Soukeur, EL Hussein Iz, Chaabane, Djamal, Amarouche, Khalid, and Bachari, Nour El Islam
- Subjects
ARTIFICIAL neural networks ,SOLAR radiation ,TIME series analysis ,RENEWABLE energy sources ,PREDICTION models ,SOLAR energy ,SALINE water conversion - Abstract
Water and clean energies are currently a major scientific and political concern. The use of numerical prediction is often recommended in these areas, for optimal exploitation of renewable energy resources, mainly for seawater desalination and other energy and food security activities. In this study, we present an application of artificial neural networks (ANN), developed for daily solar energy forecasting. The ANN model developed is based on the multi-layer perceptron, the most widely used ANN type in renewable energy and time series forecasting. The developed model has two main properties: I. The ANN training is based on long-term reanalysis data, allowing the model to be trained even in areas where no radiation measurements are available, as is the case for marine areas and in the new desalination plants. II. The model allows automatic selection of the optimal ANN model architecture based on the training data. A thirty-nine-year time series of reanalysis data between 1980 and 2018 was used for training and model implementation. Thus, the model accuracy was evaluated based on one-year data (2019). The obtained error analysis results show that the developed model has a good performance in line with previous studies. The developed ANN models are characterized by reasonable daily prediction accuracy, with a root mean square error of 3.248 MJ/(m2 d) for solar radiation prediction. This verifies the accuracy and ability of the model to predict solar radiation to ensure optimal management of solar energy farms. [ABSTRACT FROM AUTHOR]
- Published
- 2022
- Full Text
- View/download PDF
10. Creating an artificial neural network time series model for the prediction of daily solar radiation in Oran
- Author
-
Soukeur, E.L. Hussein Iz El Islam, Chaabane, Djamal, Amarouche, Khalid, and Bachari, Nour El Islam
- Abstract
Water and clean energies are currently a major scientific and political concern. The use of numerical prediction is often recommended in these areas, for optimal exploitation of renewable energy resources, mainly for seawater desalination and other energy and food security activities. In this study, we present an application of artificial neural networks (ANN), developed for daily solar energy forecasting. The ANN model developed is based on the multi-layer perceptron, the most widely used ANN type in renewable energy and time series forecasting. The developed model has two main properties: I. The ANN training is based on long-term reanalysis data, allowing the model to be trained even in areas where no radiation measurements are available, as is the case for marine areas and in the new desalination plants. II. The model allows automatic selection of the optimal ANN model architecture based on the training data. A thirty-nine-year time series of reanalysis data between 1980 and 2018 was used for training and model implementation. Thus, the model accuracy was evaluated based on one-year data (2019). The obtained error analysis results show that the developed model has a good performance in line with previous studies. The developed ANN models are characterized by reasonable daily prediction accuracy, with a root mean square error of 3.248 MJ/(m2d) for solar radiation prediction. This verifies the accuracy and ability of the model to predict solar radiation to ensure optimal management of solar energy farms.
- Published
- 2022
- Full Text
- View/download PDF
11. Potential of exhaust heat recovery for intake charge heating in a diesel engine transient operation at cold conditions
- Author
-
V. Dolz, Ausias Moratal, Jose Borges-Alejo, Héctor Climent, Zoulikha Soukeur, and José Manuel Luján
- Subjects
Diesel engine ,Engineering ,Exhaust heat recovery system ,Diesel exhaust ,020209 energy ,Energy Engineering and Power Technology ,02 engineering and technology ,Industrial and Manufacturing Engineering ,0203 mechanical engineering ,0202 electrical engineering, electronic engineering, information engineering ,Low temperature ,Pollutant emissions ,Recuperator ,Exhaust gas recirculation ,Waste management ,business.industry ,INGENIERIA AEROESPACIAL ,Intake air heating ,020303 mechanical engineering & transports ,Exhaust heat recovery ,Internal combustion engine ,MAQUINAS Y MOTORES TERMICOS ,Back-fire ,business ,Secondary air injection - Abstract
In this paper, an experimental facility is implemented with the aim of improving the performance of internal combustion engines working at low ambient temperatures. Pollutant emissions and fuel consumption are one of the major issues that automotive engineers have to face. Cold engine start and warming up analysis have become important topics for researches. In this work, an exhaust heat recovery system for a diesel engine has been proposed as a solution to cold operation negative effects. The energy obtained from the exhaust gases was used to increase the intake air temperature. The experiments were carried out in transient load conditions at three different levels of ambient temperature (up to -7ºC). Exhaust heat recovery was combined with different strategies of exhaust gas recirculation. Intake air heating results with the heat recovery system show a reduction of 65% in unburned hydrocarbons, 40% in carbon monoxide and 10% in fuel use compared to standard air-air intercooler., This research has been partially financed by the Ministerio de Economia y Competitividad of Spain, through project IPT-370000-2010-022 'Investigacion y desarrollo de tecnologias de EGR adaptadas a las nuevas arquitecturas y requerimientos de refrigeracion en motores diesel sobrealimentados para automocion (HIREFIRE)'. The authors gratefully appreciate this support. Authors want to acknowledge the "Apoyo para la investigacion y Desarrollo (PAID)" grant for doctoral studies (FPI S2 2015 1062).
- Published
- 2016
12. High Voltage Live Works: Comparative Safe Distance Approach Calculation
- Author
-
S. Belkhir, F. Soukeur, T. Ainouche, and H. Moulai
- Subjects
Engineering ,Renewable Energy, Sustainability and the Environment ,business.industry ,Electronic engineering ,Energy Engineering and Power Technology ,High voltage ,Electrical and Electronic Engineering ,business ,Simulation - Published
- 2012
13. Exhaust gas recirculation dispersion analysis using in-cylinder pressure measurements in automotive diesel engines
- Author
-
Benjamín Pla, José Manuel Luján, Héctor Climent, Nicolas-Yoan Francois, Zoulikha Soukeur, Manuel Eduardo Rivas-Perea, and Jose Borges-Alejo
- Subjects
Diesel engine ,Engineering ,Test bench ,EGR ,business.industry ,Energy Engineering and Power Technology ,Combustion ,Industrial and Manufacturing Engineering ,Automotive engineering ,Diesel fuel ,High pressure EGR ,Fuel consumption ,NOx emissions ,MAQUINAS Y MOTORES TERMICOS ,Fuel efficiency ,Exhaust gas recirculation ,EGR dispersion ,Dispersion (chemistry) ,business ,NOx - Abstract
Current diesel engines are struggling to achieve exhaust emissions regulations margins, in certain cases penalizing the fuel consumption. The exhaust gas recirculation (EGR) continues to be employed as a technique to reduce NOx emissions. EGR dispersion between cylinders is one important issue when a high pressure (HP) loop is used. Different techniques have been developed in order to analyze the EGR dispersion between cylinders in an engine test bench. In this paper a methodology using the in-cylinder pressure was developed. The in-cylinder pressure was used to calculate a heat release law and combustion parameters that were used to analyze the EGR dispersion between cylinders. Engine test measurements at three different engine speeds and with three different HP-EGR configurations were performed in order to assess the developed analysis methodology. NOx emissions and fuel consumption were also compared between the different HP-EGR configurations to complete the analysis. The developed methodology was successfully used in three different operating conditions for three different HP-EGR configurations, showing the relation between the decrease in EGR dispersion between cylinders and the decrease in NOx emissions, while maintaining and, in some points, improving the fuel consumption.
- Published
- 2015
14. Physical and photo-electrochemical properties of MgFe2O4 prepared by sol gel route: application to the photodegradation of methylene blue.
- Author
-
Hammache, Z., Soukeur, A., Omeiri, S., Bellal, B., and Trari, M.
- Subjects
PHOTOELECTROCHEMISTRY ,PHOTODEGRADATION ,METHYLENE blue ,SOL-gel processes ,SPINEL group - Abstract
The spinel MgFe
2 O4 synthesized by sol gel method, was characterized by physical and electrochemical methods. The thermal analysis (TG) gives an optimal synthesis temperature of 650 °C where the X-ray diffraction pattern exhibits a single phase crystallizing in a cubic symmetry (Space Group: Fd3-m) with spherical crystallites (~ 0.45 µm). The morphology observed through the SEM image shows elliptical and spherical grains of ~ 0.8 µm. The spinel possesses a direct optical transition (2.16 eV) due to electrons transfer Fe3+ : d−d transition, coming from the crystal field splitting in agreement with the red color. The low electrons mobility is assigned to a narrow conduction band of Fe3+ : 3d parentage with activation energy (0.14 eV) in conformity with a conduction mechanism by small polaron hopping. The semi-logarithmic plot confirms the chemical stability of oxide. Unlike other spinels, the capacitance plot exhibits n type conduction confirmed by chrono-amperometry with a flat band potential (Efb ) of 0.27 V. The electrochemical impedance spectroscopy displays a semi-circle attributed to the bulk behavior. As application, the photodegradation of methylene blue (10 mg L− 1 ) was successfully on the spinel suspension; 87% are eliminated after 2 h of exposure to sunlight irradiation. [ABSTRACT FROM AUTHOR]- Published
- 2019
- Full Text
- View/download PDF
15. Potential of exhaust heat recovery for intake charge heating in a Diesel engine transient operation at cold conditions
- Author
-
Universitat Politècnica de València. Escuela Técnica Superior de Ingenieros Industriales - Escola Tècnica Superior d'Enginyers Industrials, Universitat Politècnica de València. Escuela Técnica Superior de Ingeniería del Diseño - Escola Tècnica Superior d'Enginyeria del Disseny, Universitat Politècnica de València. Instituto Universitario CMT-Motores Térmicos - Institut Universitari CMT-Motors Tèrmics, Ministerio de Ciencia e Innovación, Universitat Politècnica de València, Lujan Martinez, José Manuel, Climent Puchades, Héctor, Dolz Ruiz, Vicente, Moratal Martínez, Ausiás Alberto, Borges Alejo, José, Soukeur, Zoulikha, Universitat Politècnica de València. Escuela Técnica Superior de Ingenieros Industriales - Escola Tècnica Superior d'Enginyers Industrials, Universitat Politècnica de València. Escuela Técnica Superior de Ingeniería del Diseño - Escola Tècnica Superior d'Enginyeria del Disseny, Universitat Politècnica de València. Instituto Universitario CMT-Motores Térmicos - Institut Universitari CMT-Motors Tèrmics, Ministerio de Ciencia e Innovación, Universitat Politècnica de València, Lujan Martinez, José Manuel, Climent Puchades, Héctor, Dolz Ruiz, Vicente, Moratal Martínez, Ausiás Alberto, Borges Alejo, José, and Soukeur, Zoulikha
- Abstract
In this paper, an experimental facility is implemented with the aim of improving the performance of internal combustion engines working at low ambient temperatures. Pollutant emissions and fuel consumption are one of the major issues that automotive engineers have to face. Cold engine start and warming up analysis have become important topics for researches. In this work, an exhaust heat recovery system for a diesel engine has been proposed as a solution to cold operation negative effects. The energy obtained from the exhaust gases was used to increase the intake air temperature. The experiments were carried out in transient load conditions at three different levels of ambient temperature (up to -7ºC). Exhaust heat recovery was combined with different strategies of exhaust gas recirculation. Intake air heating results with the heat recovery system show a reduction of 65% in unburned hydrocarbons, 40% in carbon monoxide and 10% in fuel use compared to standard air-air intercooler.
- Published
- 2016
16. Exhaust gas recirculation dispersion analysis using in-cylinder pressure measurements in automotive diesel engines
- Author
-
Universitat Politècnica de València. Departamento de Máquinas y Motores Térmicos - Departament de Màquines i Motors Tèrmics, Universitat Politècnica de València. Instituto Universitario CMT-Motores Térmicos - Institut Universitari CMT-Motors Tèrmics, Luján, José M., Climent, H., Plá Moreno, Benjamín, Rivas Perea, Manuel Eduardo, Francois, Nicolas-Yoan, Borges Alejo, José, Soukeur, Zoulikha, Universitat Politècnica de València. Departamento de Máquinas y Motores Térmicos - Departament de Màquines i Motors Tèrmics, Universitat Politècnica de València. Instituto Universitario CMT-Motores Térmicos - Institut Universitari CMT-Motors Tèrmics, Luján, José M., Climent, H., Plá Moreno, Benjamín, Rivas Perea, Manuel Eduardo, Francois, Nicolas-Yoan, Borges Alejo, José, and Soukeur, Zoulikha
- Abstract
Current diesel engines are struggling to achieve exhaust emissions regulations margins, in certain cases penalizing the fuel consumption. The exhaust gas recirculation (EGR) continues to be employed as a technique to reduce NOx emissions. EGR dispersion between cylinders is one important issue when a high pressure (HP) loop is used. Different techniques have been developed in order to analyze the EGR dispersion between cylinders in an engine test bench. In this paper a methodology using the in-cylinder pressure was developed. The in-cylinder pressure was used to calculate a heat release law and combustion parameters that were used to analyze the EGR dispersion between cylinders. Engine test measurements at three different engine speeds and with three different HP-EGR configurations were performed in order to assess the developed analysis methodology. NOx emissions and fuel consumption were also compared between the different HP-EGR configurations to complete the analysis. The developed methodology was successfully used in three different operating conditions for three different HP-EGR configurations, showing the relation between the decrease in EGR dispersion between cylinders and the decrease in NOx emissions, while maintaining and, in some points, improving the fuel consumption.
- Published
- 2015
17. The Particle Swarm Optimization Against the Runge's Phenomenon: Application to the Generalized Integral Quadrature Method
- Author
-
A. Zerarka, A. Soukeur, and N. Khelil
- Subjects
particle swarm optimization ,MathematicsofComputing_NUMERICALANALYSIS ,Runge's phenomenon ,Integral equation - Abstract
In the present work, we introduce the particle swarm optimization called (PSO in short) to avoid the Runge-s phenomenon occurring in many numerical problems. This new approach is tested with some numerical examples including the generalized integral quadrature method in order to solve the Volterra-s integral equations
- Published
- 2009
- Full Text
- View/download PDF
18. On Some Volterra and Fredholm Problems via the Unified Integrodifferential Quadrature Method
- Author
-
Zerarka, Abdelwahab, primary, Soukeur, Abdesselam, additional, and Saidi, Hanane, additional
- Published
- 2012
- Full Text
- View/download PDF
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