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Comparative Study of the Effect of Shading Rate on the Electrical Parameters of CIGS and CdTe/CdS Solar Modules

World Journal of Condensed Matter Physics 2022年第4期12卷 39-45页

作者： El Hadji Abdoulaye Niass Oumar Absatou Niasse Nacire Mbengue Zakaria Makir zouhair sofiani Bassirou Ba Laboratory of the Semiconductors and Solar Energies (LASES) Physical Department Science Faculty University Cheikh Anta Diop of Dakar Dakar Senegal Laboratory of Materials Energy and System Control (LMECS) Physical Department Science Faculty of Mohammadia University Hassan II of Casablanca Casablanca Morocco

In this paper, a comparative study of the maximum power on the shading rate on the maximum power of thin film PV modules. Thus two thin film PV modules of type Copper indium gallium selenide, CIGS, of 90W power and a CdTe (Cadmium telluride)/CdS (Cadmium sulfide) module, of maximum power 75 W. These modules, reference SN-CIGS90 and CX3 75 were tested under the conditions of the installation site to ensure their proper functioning and to determine the initial values of electrical parameters before shading. The results obtained are as follows: for the CIGS: Pm (80.717 W);Vco (23.06 V), Icc (3.5 A) and for the CdTe:Pm (54.914 W);Vco (35.52 V), Icc (1.546 A). After this characterization test, the modules are exposed to real operating conditions at the Center for Study and Research on the renewable energy (CERER), Cheikh Anta Diop University in Dakar. Four types of shading are performed on each module with the same mask: partial shading at 25%, 50%, 75% and complete shading at 100%. The comparison of the variation rates obtained on the experimental values of the 4 types of shading carried out on each module, shows that, the phenomenon of shading constitutes an environmental factor which influences negatively the maximum power of the thin film PV modules. But this reduction depends on the surface of the shaded module, the nature of the mask but also the technology used. Indeed, for a shading of 25% of the surface of the two modules, we note a reduction of 21.32% of power for the CIGS, against 40.53% for the CdTe/CdS, that is to say a difference which approaches 20%.

关键词： CIGS CdTe/CdS Shading Rate Maximum Power Mask

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Effects of the Shading Rate on the Electrical Parameters of CIGS-Based Solar Modules

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Energy and Power Engineering 2021年第12期13卷 483-491页

作者： El Hadji Abdoulaye Niass Papa Touty Traore Awa Dieye Oumar Absatou Niasse Pierre Tavarez Nacire Mbengue Zakaria Makir zouhair sofiani Bassirou Ba Physics Department Faculty of Science and Technology University Cheikh Anta Diop Dakar Senegal Physics Department Faculty of Science and Technology of Mohmammadia Laboratory Laboratory of Materials and Energy and System Control University Hassan II Casablanca Marocco

The aim of this article is to study the effects of the shading rate on the electrical performance parameters of CIGS PV modules. The study concerns a new flexible CIGS type photovoltaic module with a power of 90 W, manufactured by the company Shenzhen Shine Solar Co., Ltd. This module, reference SN-CIGS90, is tested under the initial conditions to ensure its correct operation and to determine the initial values of the electrical parameters before shading. After this characterization test, the module is exposed under the actual operating conditions of the Renewable Energies Study and Research Center (CERER), located in Dakar, then 4 types of shading are performed with the same mask: partial shading 25% partial shading, 50% partial shading, 75% partial shading, and 100% full shading. The variation rates obtained on the experimental values of the 4 types of shading carried out determine that the shading phenomenon constitutes a factor that influences negatively on the electrical parameters of a CIGS-based PV module. Indeed, for 25% of the surface of the shaded module, there is a reduction of 58.139% of the maximum power and of 60.507% of the efficiency and for shading of 100%, the module loses 84.436% of its maximum power and 84.135% of its performance.

关键词： Modulus Shading Rate Electrical Parameters Mask

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Molecular characterization and pathogenicity of Mycoplasma capricolum subsp. capricpolum from goats in Morocco

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Animal Diseases 2022年第2期2卷 89-99页

作者： Noha Semmate Zaid Zouagui zouhair Elkarhat Zahra Bamouh Siham Fellahi Noursaid Tligui Zineb Boumart Ouafaa Fassi Fihri Mehdi El Harrak Research and Development Department Multi-Chemical IndustryMohammediaMorocco Agronomic and Veterinary Institute Hassan II BP:6202Rabat InstitutionsRabatMorocco

Mycoplasma capricolum ***(Mcc)is an important etiological agent of contagious agalactia(CA).CA affects small ruminants and is characterized by inducing mastitis,arthritis,kerato-conjunctivitis and respiratory *** aim of this study was to isolate and characterize Mcc from Moroccan goats with contagious agalactia.A total of 300 Alpine goats were *** analysis,molecular identification,and isolation of Mcc were realized from suspected *** experimental study was conducted for isolated Mcc to determine their ***,clinical observation showed that respiratory symptoms were predominant in young animals,and other symptoms,such as mastitis,keratoconjunctivitis and lameness,were more frequently detected in adult *** the 80 tested blood samples,28 sera were seropositive for Mcc *** was identified by polymerase chain reaction(PCR)in milk,lung tissue and synovial liquid *** isolation of Mcc was successful through bacterial culture from lung *** gene sequence of this strain revealed 98.1%similarity with the reference strain(ATCC 27343),with 11 missense *** infection resulted in severe and generalized CA disease in sheep and goats,confirming the high pathogenicity of the Moroccan Mcc isolate.

关键词： Contagious agalactia Mcc Goats Sheep Morocco

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Novel lead-free BCZT-based ceramic with thermally-stable recovered energy density and increased energy storage efficiency

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Journal of Materiomics 2022年第4期8卷 873-881页

作者： zouhair Hanani Soukaina Merselmiz M'barek Amjoud Daoud Mezzane Mohammed Lahcini Jaafar Ghanbaja Matjaz Spreitzer Damjan Vengust Mimoun El Marssi Igor A.Luk'yanchuk Zdravko Kutnjak Brigita Rozic Mohamed Goune IMED-Lab Cadi Ayyad UniversityAvenue Abdelkrim El KhattabiP.B.549Marrakesh40000Morocco ICMCB University of Bordeaux87 Avenue Du Dr Albert SchweitzerPessac33600France Jozef Stefan Institute Jamova Cesta 39Ljubljana1000Slovenia LPMC University of Picardy Jules Verne33 Rue Saint LeuAmiens80039France Mohammed VI Polytechnic University Lot 660-Hay Moulay RachidBen Guerir43150Morocco IJL University of Lorraine54000NancyFrance Department of Building Materials Kyiv National University of Construction and ArchitectureKyiv03680Ukraine

The eco-responsible lead-free piezoelectric ceramics have been intensively searched for more than adecade, however, the final goal to replace toxic ceramics like lead zirconate titanate (PZT) with lead-freecompounds, having comparable or even better performance has not yet been reached. In this road, thelead-free ceramics Ba_(0.85)Ca_(0.15)Zr_(0.1)Ti_(0.9)O_(3) (BCZT), possessing excellent dielectric, ferroelectric, andpiezoelectric properties are regarded as serious candidates for the PZT replacement. Besides, nano-structuring BCZT is of paramount importance to enhance these functionalities even more. Here, BCZTmultipodes are designed by template-growth hydrothermal synthesis using hydrogen zirconate titanatenanowires. We demonstrate that the fabricated BCZT multipodes exhibit high dielectric permittivity of5300 with a temperature stability coefficient of ±5.9% between 20 and 140℃. A significant recoveredenergy density of 315.0 mJ/cm^(3) with high thermal stability and high energy storage efficiency of 87.4%,and enhanced large-signal piezoelectric coefficient d^(*)_(33) (310 pm/V) are found. Compared to the tradi-tional BCZT ceramics reported in the literature, relying on high-temperature processing, our sampleexhibits boosted energy storage parameters at a much lower temperature. These outcomes may offer anew strategy to tailor eco-responsible relaxor ferroelectrics toward superior energy storage performancefor ceramic capacitor applications.

关键词： Lead-free ceramics Low temperature Piezoelectric Thermal stability Energy storage Nanostructuration

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EEG epileptic seizure detection and classification based on dual-tree complex wavelet transform and machine learning algorithms

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The Journal of Biomedical Research 2020年第3期34卷 151-161页

作者： Itaf Ben Slimen Larbi Boubchir zouhair Mbarki Hassene Seddik Centre de Recherche et de Production Research Lab. Ecole Nationale Superieure des Ingenieurs de TunisUniversity of TunisTunis 1008Tunisia Laboratoire d^nfbrmatique Avancee de Saint-Denis Research Lab. University of Paris 8Saint-DenisCedex 93526France

The visual analysis of common neurological disorders such as epileptic seizures in electroencephalography(EEG) is an oversensitive operation and prone to errors,which has motivated the researchers to develop effective automated seizure detection *** paper proposes a robust automatic seizure detection method that can establish a veritable diagnosis of these *** proposed method consists of three steps:(i) remove artifact from EEG data using Savitzky-Golay filter and multi-scale principal component analysis(MSPCA),(ii) extract features from EEG signals using signal decomposition representations based on empirical mode decomposition(EMD),discrete wavelet transform(DWT),and dual-tree complex wavelet transform(DTCWT) allowing to overcome the non-linearity and non-stationary of EEG signals,and(iii) allocate the feature vector to the relevant class(i.e.,seizure class "ictal" or free seizure class "interictal") using machine learning techniques such as support vector machine(SVM),k-nearest neighbor(k-NN),and linear discriminant analysis(LDA).The experimental results were based on two EEG datasets generated from the CHB-MIT database with and without overlapping *** results obtained have shown the effectiveness of the proposed method that allows achieving a higher classification accuracy rate up to 100% and also outperforms similar state-of-the-art methods.

关键词： electroencephalography epileptic seizure detection feature extraction dual-tree complex wavelet transform machine learning

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Exploration and Mapping of Metalliferous Black Shales in the Saghro Temporary Subsidence Zones (Anti-Atlas, Morocco)

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Open Journal of Geology 2023年第7期13卷 740-762页

作者： Ali Bouayachi Saida Alikouss Zouhir Baroudi Youssef Zerhouni Lahcen Rakhis Mohammed zouhair Assia Idrissi Mourad Essalhi Barzouk Abdelhafed Department of Geology Faculty of Sciences Ben M’Sik University Hassan II Casablanca Morocco MANAGEM Group 191 bd Med Zerktouni Twin Center Tour A. 20100 Casablanca Morocco Department of Geology Faculty of Sciences University Mohamed V Rabat Morocco Faculty of Sciences and Techniques University Molay Ismail Errachidia Morocco Faculty of Sciences Semlalia Caddi Ayyad University Marrakech Morocco

The Saghro massif constitutes a vast metallogenic province with numerous deposits and shows of base metals (lead, zinc, copper) and precious metals (gold and silver), besides various useful substances (talc, pyrophyllite, barite, fluorite). Silver/lead occurrences are concentrated along the Cryogenian Imiter series and moderately at Boumalne and Sidi Flah. Copper occupies the plutonic intrusions and intrusive rocks of the East-Central Saghro while barite deposits are widespread throughout the Cambrian cover of the East Saghro in contact with the Ediacaran basement. To justify this distribution, the new contributions of the cartography and the organic geochemistry of the black shales of Jbel Saghro have clearly shown the particularity of the Imiter black shales in terms of the richness in organic matter (TOC = 0.18%), the blackish color and the friability. The Boumalne and Sidi Flah groups present some similarities with the Imiter group, such as the sub-equatorial structuring, the friable pelites and the richness in organic matter (Boumalne TOC = 0.11% and SidiFlah TOC = 0.16%), which is a quite good show that requires to reinforce the exploration works. For Western Saghro in the Iknioun and Qalaa’t M’Gouna groups, the variations in the thickness of the volcanic cover show an irregular paleotopography with hard, greenish, organic-poor pelitic sediments (TOC = 0.01 to 0.04%). We can conclude that the formation of Imiter-type silver concentrations requires the combination of the sedimentological, the volcanic and structural factors. For Imiter-type silver these factors are: a fine pelitic and argillic casing deposited in a confined environment, a basic volcanism source of metals and other intermediate to acid generated by the hydrothermalism and heat, a convenable paleotopography and a network of fracturations to trap the mineralizations.

关键词： Saghro Metallic Shales Silver TOC Exploration Cryogenic Polymetallic Imiter

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LIMIT CYCLES TO A FOUR-DIMENSIONAL LINEAR CENTER

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Annals of Differential Equations 2013年第4期29卷 399-405页

作者： zouhair Diab Amar Makhlouf Dept. of Math. University of Djelfa Dept. of Math. Faculty of Sciences University UBM of Annaba

In this paper we study a four-dimensional linear center. Based on the averaging theory, we investigate the existence of limit cycles of the system.

关键词： limit cycle averaging theory perturbation

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Longitudinal Variability of the Vertical Drift Velocity Inferred from Ground-Based Magnetometers and C/NOFS Observations in Africa

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International Journal of Geosciences 2022年第8期13卷 657-680页

作者： Messanga Etoundi Honoré Paul Obiakara Amaechi Augustin Daïka Diaby Kassamba Abdel Aziz Mohamed Kaab César Biouele Mbané zouhair Benkhaldoun Department of Geomatics Higher Technical Teacher Training College of Ebolowa University of Ebolowa Ebolowa Cameroon Applied Biotechnology and Engineering Laboratory Higher Technical Teacher Training College of Ebolowa Ebolowa Cameroon Laboratory of Earth’s Atmosphere Physics Faculty of Science University of Yaoundé 1 Yaoundé Cameroon Cardiff School of Education & Social Policy Cardiff Metropolitan University Cyncoed Campus Cardiff UK Department of Meteorology and Climatology National Advanced School of Engineering University of Maroua Maroua Cameroon Laboratoire de Physique de l’Atmosphère UFR-SSMT Université Félix Houphou&#235 t Boigny Abidjan C&#244 te d’Ivoire Oukaimeden Observatory LPHEA FSSM Cadi Ayyad University Marrakech Morrocco National School of Applied Sciences of Beni Mellal Sultan Moulay Sliman University Beni Mellal Morocco

This study aims at discussing longitudinal effects on the variability of the vertical E × B drift velocity at low latitudes, specifically over African sector. To this effect, observations from ground-based magnetometers and the Ion Velocity Meter experiment onboard C/NOFS satellite are analyzed in conjunction with equatorial electric field and neutral wind model estimates under geomagnetically quiet conditions in the years 2012-2013. Notwithstanding the limitation in data over Africa, the combination of ground-based and in-situ observations confirmed the existence of longitudinal differences in the E × B between the Atlantic, Western and Eastern African sectors. This was well reproduced by the equatorial electric field model (EEFM) which showed that during noon, the peak of the equatorial electric field (EEF) was the lowest in the Atlantic sector, with an increasing trend towards the Eastern longitude. The Horizontal Wind Model 14 (HWM14) showed that the eastward zonal (poleward meridional) wind velocity was the lowest (highest) in the Eastern sector. Furthermore, the zonal (meridional) wind increased (decreased) from the Eastern to the Atlantic sector. These results highlight the contribution of the neutral wind velocity in driving the longitudinal difference in the vertical drift velocity over Africa.

关键词： Equatorial Electrojet Vertical Drift Velocity (E × B) Longitudinal Variability African Sector

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Wireless Mobile Evolution to 4G Network

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Wireless Sensor Network 2010年第4期2卷 309-317页

作者： Mohammed Jaloun zouhair Guennoun 不详

In this paper, we give an overview of the evolution of wireless mobiles starting from the first generation which is the analogue system started in 1980’s, and passing through the 2G technologies which are all digital networks and GSM is the most popular network. 2.5G networks will introduce the packet notion on the existing 2G networks and 3G will bring the quality of service as new perspective for the 3G partnership projet 3GPP and 3GPP2. However, high demand on data speed has pushed the operators to looking for 3.5G system. 3.99G networks are defined as long-term evolution for the existing 3G network and it will be based on OFDM and MIMO technologies. 4G networks was not yet defined, but requirement is to support heterogeneous networks at 100 Mbps mobility data speed.

关键词： 4G OFDM MIMO

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Distributed Frequency Assignment Using Hierarchical Cooperative Multi-Agent System

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International Journal of Communications, Network and System Sciences 2011年第11期4卷 727-734页

作者： Jamal Elhachimi zouhair Guenoun 不详

Recent demand for wireless communication continues to grow rapidly as a result of the increasing number of users, the emergence of new user requirements, and the trend to new access technologies. At the same time, the electromagnetic spectrum or frequencies allocated for this purpose are still limited. This makes solving the frequency assignment problem more and more critical. In this paper, a new approach is proposed using self-organizing multi-agent systems to solve distributed dynamic channel-assignment;it concerns distribution among agents which task is to assign personal station to frequencies with respect to well known constraints. Agents only know their variables and the constraints affecting them, and have to negotiate to find a collective solution. The approach is based on a macro-level management taking the form of a hierarchical group of distributed agents in the network and handling all RANs (Regional Radio Access Network) in a localized region regardless of the operating band. The approach defines cooperative self-organization as the process leading the collective to the solution: agents can change the organization by their own decision to improve the state of the system. Our approach has been tested on PHEADEPHIA benchmarks of frequency assignment Problem. The results obtained are equivalent to those of current existing methods with the benefits that our approach shows more efficiency in terms of flexibility and autonomy.

关键词： Dynamic Frequency Assignment Optimization Problem Multi-Agent System Artificial Intelligence

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