bluuebunny/crossref_metadata_2025_split huggingface dataset:
Design and performance analysis of Rectenna Circuit
Authors: El Batal K. , Chakhchaoui N. , Eddiai A. , Meddad M. , Rguiti M. , Mazroui M. , Cherkaoui O. 
Published: November 2020

Abstract
Radio Frequency Energy harvesting is an extremely important research subject, linked to sustainability, and could be a potential solution to conventional energy supplies. The main idea is to develop battery-free wireless sensors able to capture the available energy into the mentioned bandwidth. In this paper, a 1.8–2.4 GHz wideband rectenna is designed for radio frequency (RF) energy harvesting in the context of wireless sensor nodes (WSN). For this purpose, the agilent Advanced Design System (ADS) was used. This article presents the design and simulation of a high output voltage rectifier. First, we designed a rectifier based on Metelics MSS20-141 Schottky diode using a series topology to convert electromagnetic energy into DC. Then, a low-pass filter was implemented to filter out undesirable harmonics generated by the non-linear Schottky diode. Simulation results show that load resistance, input frequency and input power are important parameters to evaluate the performances of RF energy harvester. Also, the three RF bands, GSM1800, UMTS and Wi-Fi, are considered. Therefore, the designed system has an average RF-to-DC conversion of 18 % for an incident power of -10 dBm for a variation of 20 to 1200 Ω.
PSPICE compact model for power MOSFET based on manufacturer datasheet
Authors: Galadi Abdelghafour 
Published: November 2020

Abstract
In this paper, large signal model for power MOSFET devices is presented. The proposed model includes quasi-saturation effect and describes accurately the electrical behavior of the power MOSFET devices. The large signal model elements will be provided based on the device structure. Furthermore, the model parameters are extracted from measurements considering the voltages depending effect of the nonlinear gate-source, gate-drain and drain-source interelectrode capacitances. Excellent agreements will be shown between the simulated and the datasheet data. Finally, a description of the model will be provided along with the parameter extraction procedure.
Global MPP Tracking for Photovoltaic Panel under Shading Conditions using Robust Numerical Algorithm
Authors: Mesbahi Oumaima , Kandoussi Khalid , otmani Rabie El , Hajjaji Abdeloawahed , Janeiro Fernando M. , Tlemçani Mouhaydine 
Published: November 2020

Abstract
This paper presents a new numerical approach for the modelling of the PV panels under partial shading conditions. It also solves the major drawback of the PV systems, which is the tracking of maximum power point under partial shading conditions where the P-V characteristic has a more complex structure with many local maximums on the graph. This paper aims to resolve this phenomenon using Newton method in order to find the global maximum power point.
Thermal performance of building materials based on feather and polystyrene wastes
Authors: Mrajji Ouahiba , El Wazna Mohamed , Ouhaibi Salma , Sair Said , El Bouari Abdeslam , Cherkaoui Omar , Belouaggadia Naoual 
Published: November 2020

Abstract
The development of composites using renewable resources has received attention of scientists over the last decade, with the aim of manufacturing environmentally friendly composites, reducing cost and the dependence on petroleum resources. This experimental study emphasizes the development of new cost-efficient composite based on feather/cotton nonwoven and polystyrene waste. The microstructure and thermal properties have been determined in each FPS material. Vacuum molding method was adopted for fabricating of the biocomposites with two contents of polystyrene matrix (30% and 50%). As a result, the morphological analysis revealed better compatibility and adhesion between the nonwoven and the polystyrene matrix. The manufactured composites showed an insulating character with thermal conductivity coefficient value of 35.95 and 33.85 mW / (m.K) respectively for the composite reinforced with 30 and 50% polystyrene. The origin of the variation of this property is due to densities and the percentage of the polystyrene matrix. The composites developed with polystyrene showed very high performance, combined with sufficient durability to be potential candidates for the development of new sustainable materials for the building sector.
Techno-economic investigation of electricity and hydrogen production from wind energy in Casablanca, Morocco
Authors: Touili Samir , Merrouni Ahmed Alami , Hassouani Youssef El , Amrani Abdel-illah , Azouzoute Alae 
Published: November 2020

Abstract
The aim of this study is to investigate the technical and economic potential of electricity and hydrogen production in Casablanca, Morocco. For this reason, we simulated the performance of a 4.2 MWp wind turbine if installed in Casablanca. The results show that the electricity and hydrogen production varies greatly through the year due to the high fluctuation in wind speed. The annual electricity and hydrogen production is 29.16 GWh and 555 Tons respectively. As for the levelized cost of production, the LCOE was found to be 0.24 $/kWh and the LCOH2

were equal to 13.52 $/Kg.
Theoretical study and Simulation method for optimizing the performance of advanced Energy Harvesting techniques
Authors: Elhmamsy Y. , Ennawaoui C. , Hajjaji A. , Boughaleb Y. 
Published: November 2020

Abstract
This paper investigates and compares the efficiencies of four different interfaces for vibration based energy harvesting systems. In some cases, the increase in power was found to be in the order of ten times the output power compared to the standard approach to energy harvested by piezoelectric materials. The authors updated the review of synchronous switching techniques used in the conversion of ambient mechanical energy to useful electrical energy using piezoelectric materials is given. The basic concepts involved in the standard energy harvesting approach and synchronous switch harvesting techniques are presented. A comparative analysis of these techniques, highlighting the strengths and limitations of each approach in terms of power conversion efficiency, load independence, implementation complexity and adaptability for system applications are discussed.
Permeate flux in air gap membrane distillation for seawater desalination
Authors: Rochd S. , Salama L. , Ghazaouy K. El , Mizani S. , Zerradi H. , El Marsi M. , Moultif R. , Dezairi A. 
Published: November 2020

Abstract
Membrane distillation (MD) is a thermally driven process since only vapor molecules are transported through porous hydrophobic membranes. This process leads to the separation into different desired phases. Air gap membrane distillation (AGMD) is considered one of the most used configurations of the membrane distillation. In this work, the impacts of NaCl concentration, porosity, and membrane pore size on the production of the flux have been investigated. The results have been carried using polynomial approximations through MATLAB. These latter are in agreement with the experiments.
Structural properties and spontaneous polarization behaviour in Cu-doped LiTaO3
Authors: Tahiri M. , Jennane A. , Masaif N. , Lotfi E.M. 
Published: November 2020

Abstract
In this work, we have study theoretically the effect of cooling modes on the changes of spontaneous polarisation (Ps) of non-stoichiometric solid solutions of Cu-doped LiTaO3 in correlation with the defects structure. The changes of spontaneous polarization in rapid and slow cooling modes with the rate of % Cu2+ and with the Curie temperature, allows us to analyse the defect structure of solid solutions synthesized in ternary system Li2O-Ta2O5-(CuO)2 in vicinity of LiTaO3. The theoretical results obtained by application of our approach combined with the proposed vacancy models; show that the cooling modes have an effect on the spontaneous polarization, consequently on the defects structure of Cu-doped LiTaO3. In other hand, the proposed vacancy models investigated by our theoretical approach are able to describe the defect structure and the substitution mechanism in each solid solutions of Cu-doped lithium tantalate.
Structural and optical characterization of sprayed Mg and Ni co-doped CdS thin films for photovoltaic applications
Authors: Garmim T , Soussi L , Louardi A , Monkade M , Khaidar M , Zradba A , Erguig H , Bouabdali E , Mghaioiuini R , Elmlouky A 
Published: November 2020

Abstract
In the present work, Mg and Ni co-doped CdS thin films are grown on glass substrates at a temperature of 400 °C through spray pyrolysis. The influence of Mg-doping on structural, morphological and optical properties of CdS:Ni thin films are examined. Mg level is changed from 0 % to 7 % for CdS: Ni samples just as Ni concentration is fixed 2 % for all CdS thin films. It is observed from the X-ray diffraction spectra that all the samples exhibit hexagonal structure of CdS thin films. The scanning electron microscopy (SEM) images showed a dense surface structure composed of crystallites whose average size increase with increasing the Mg doping. The optical transmission curves demonstrate that CdS:Ni thin films exhibit a best optical transparency in the visible range for 1 % Mg content compared to other specimens. The energy of the optical band gap tends to decrease from 2.46 to 2.40 eV with increasing Mg concentration in CdS: Ni.
Electric and dielectric behavior of carbonate intercalated CoAl-Layered Double Hydroxide (LDH) investigated by impedance spectroscopy
Authors: Bouragba F Z , Elhatimi W , Lahkale R , Moujahid E , Sabbar E 
Published: November 2020

Abstract
Cobalt-based layered double hydroxides (LDH) have invoked a great deal of interest in the field of energy storage due to their unique properties and low cost. Herein, carbonate intercalated CoAl-LDH was prepared in order to investigate the electrical and dielectric properties of this material. This polycrystalline sample was synthesized by the conventional co-precipitation method, characterized by PXRD, FT-IR and TGA, and analyzed by ICP. Ac impedance was measured by the complex impedance spectroscopy (CIS) method using pressed pellet sample over a frequency range of (1Hz-1MHz) and room temperature, to separate contribution of grains and grain boundaries to capacitance, resistance and conductivity of the sample. The adjustment of conductivity parameters by the double power law allowed the determination of σ
dc. The relaxation mechanism is dominated by long range movement of charge carriers: carbonate ions and H+ protons of water molecules in the interlayer space. This material exhibits high dielectric constant values and a low loss factor at high frequencies which makes the valorization of this material may be interesting in the area of dielectrics.
Optical properties of Red pigment for Dye Sensitized Solar Cells
Authors: Anoua Rania , Touhtouh Samira , Jouad Mohamed El , Hajjaji Abdelowahed , Bakasse Mina , Płociennik Przemysław , Zawadzka Anna 
Published: November 2020

Abstract
This work contains a description of the optical properties of Lithol Bordeaux dye thin films. The main use of this dye is for Dye Sensitized Solar Cells (DSSCs). Hence the need to deposit this dye as a thin layer in order to know its optical properties. The films were successfully grown by physical vapor deposition (PVD) technique in a high vacuum on transparent (glass) kept at room temperature during the deposition process. Optical properties were investigated by transmittance and photoluminescence measurements. Strong luminescence was observed around 1,68×107 CPS and a reaching an absorbance band about 100 nm in the visible range.
Oriented Membrane Processes For Extraction Of Methylene Blue And Blue P3R Dyes Across Polymer Inclusion Membranes Containing Chitin As New Extractive Agent
Authors: Chaouqi Y. , Ouchn R. , El Bouchti M. , Cherkaoui O. , Hlaibi M. 
Published: November 2020

Abstract
In the present work, according to the phase inversion technique, we have developed polymer inclusion membranes (PIMs) based on polymer supports polyvinylidene fluoride (PVDF) and polyvinyl pyrrolidone (PVP), with chitin as extractive agent (EA). These PIMs have been used to study the facilitated extraction and recovery of the Methylene Blue (MB) and Blue P3R dyes from simulated aqueous textile solutions. FT-IR spectra and SEM micrographs of these membranes were recorded to explore composition, structure and morphology of the elaborated PIMs. The adoption of the kinetic and thermodynamic models based on the Fick's laws, and the saturation law of the EA by the substrate (dyes) were tested to explain the performance of each membrane and the mechanism of the studied process for the recovery of dyes from water. The overall data indicate that the used extractive agent is effective for this oriented process, and the adopted membranes can remove about 87% of dyes from wastewater, without applying any external pressure on the polluted aqueous medium.
Synthesis And Characterization Of Nickel-Molybdenum Catalysts Supported On Copper Orthophosphates
Authors: Mbarka Ouchabi , Mohammed Baalala , Abdelkrim Elaissi , Mohammed Bensitel 
Published: November 2020

Abstract
Synthesis of a pure copper orthophosphate (CuP) prepared by Coprecipitation, and CuP modified by impregnation of NiMo (2-14 wt % of Ni-Mo oxide) have been carried out. The solids obtained were investigated as synthesized or after calcination by various physico-chemical techniques such as X-Ray Diffraction (XRD), Infrared Spectroscopy (IR), Thermogravimetric analysis (TGA), and differential thermal analysis (DTA). The results revealed that the solids NiMo/CuP consisted of copper orthophosphate Cu3(PO4)2 as major phases, together with NiMoO4 as minor phase. The diffraction lines of NiMoO4 increase by increasing the nickel-molybdenum content.
Piezoelectric β-polymorph enhancement in graphene oxide -PLA nanocomposite films
Authors: Oumghar K. , Chakhchaoui N. , Farhan R. , Eddiai A. , Meddad M. , Cherkaoui O. , Mazroui M. , Langenhove Lieva Van 
Published: November 2020

Abstract
The flexible piezoelectric nanocomposite films have attracted considerable interest for use in autonomous nanosystems, sensors and portable electronics. The effect of graphene oxide (GO) nanoparticles on the crystal structure, unique crystallization, mechanical behavior and significant improvement in piezoelectricity of polylactic acid (PLA) has been reported. Polylactic acid / graphene oxide (PLA/GO) nanocomposite films were prepared by the solvent casting technique using different percentages of GO. The different samples were characterized by Polarized optical microscope (POM), Fourier transformed infrared (FTIR) and X-ray diffraction analysis. The presence of β phase in nanocomposites and the enhancement of their piezoelectric properties were confirmed by FTIR and XRD analysis. These electroactive and biodegradable polymer nanocomposite thin films may be a potential candidate for the piezoelectric nanogenerators, energy storage devices and energy harvesting applications.
Growth and Characterization of CZTS Thin Films Synthetized by Electrodeposition Method for Photovoltaic Applications
Authors: Ziti Ahmed , Hartiti Bouchaib , Labrim Hicham , Fadili Salah , Batan Abdelkrim , Ridah Abderraouf , Thevenin Philippe 
Published: November 2020

Abstract
In the present work we deposited CZTS absorber material using a one-step electrodeposition method on ITO glass substrates. We studied the effect of sulfurization temperature on structural, morphological and optical properties of CZTS thin films sulfurized in N2+H2S atmosphere at 350, 375, 400 and 425°C for 10 min respectively for 10 min. The films have been charaterized by different techniques including X-ray diffractometer (XRD), Raman spectroscopy, scanning electron microscopy (SEM) and UV-visible-NIR spectrophotometer. XRD patterns indicated kesterite CZTS with preferential orientation along (112) plane, the intensity of peaks increased with increase of sulfurization temperature signified the amelioration of the crystallinity with sulfurization temperature increased, the estimated crystallite size are in the range of 14.27-37.32 nm. Raman scattering experiments confirmed the presence of CZTS thin films by the characteristic peak at 336 cm−1. SEM images showed the morphology of CZTS thin films improved with increasing of sulfurization temperature. UV-Visible-NIR spectrophotometer showed that the values of optical absorption coefficient are larger than 104 cm−1 and optical band gap energy of CZTS thin films decreased with increasing of sulfurization temperature ranging 1.56 and 1.66 eV. These results make the electrodeposited CZTS films a suitable material as absorber material in solar cells applications based thin films.
First Au monolayer formation on Cu(110) surface
Authors: Sbiaai K. , Dardouri M. , Fathi A. , Arbaoui A. , Hassani A. , Eddiai F. , El Azrak A. , Hasnaoui A. , Boughaleb Y. 
Published: November 2020

Abstract
We study in this work the growth of a gold monolayer on a Cu (110) surface thanks to the kinetic Monte Carlo method. We considered a coverage of 0.1% of the monolayer. Indeed, the growth of a monolayer is done through the intermediary of several diffusion processes. All activation energies for each process were calculated using the static method coupled with the KMC method. This coupling is established by the ABBM anisotropic bond breaking model. The study of the results obtained in the temperature range (100-300K) at different deposition rates shows the formation of small 1D islands and certain 2D islands at high temperature (280 k-300 K).
Experimental investigation on reinforced concrete beams by honeycomb sandwich panel structures: mechanical properties study
Authors: Essaadaoui K , Ait El Fqih M , Idiri M , Boubeker B 
Published: November 2020

Abstract
In this work, the results of an experimental investigation on reinforced concrete by fiberglass honeycomb sandwich panel structures are presented. The experimental program included three beam specimens. Two of the beams were reinforced with different thicknesses of honeycomb structures. Flexural and uniaxial compression tests were performed. The tensile strength remains to be increases by a factor of 2.40 for compression and by 1.60 for flexion. The results obtained in terms of reinforcement are discussed. The changes are likely attributed to a modification of the adhesion forces at the honeycomb structures/concrete interface.
Correlation and diffusion breaking in the failure process of composite materials
Authors: Hader A. , Sbiaai H. , Tanasehte M. , Bakir R. , Boughaleb Y. 
Published: November 2020

AbstractFiber bundle model is one of the important statistical and theoretical physics approaches to investigate the fracture and breakdown of heterogeneous material extensively used both by the engineering and physics community. In this paper, using the correlation function and its properties, we study the diffusion of the failure process in composite materials that consist of a set of with randomly oriented fibers loaded by an external constant total load. The investigation is based on fiber bundle model where the fibers are randomly oriented; each fiber is subject only the cosine component of the external load, and when it fails, its load is shared by surviving neighboring fibers according to the local load sharing rule (LLS). The failure process ensures an advancing interfacial fracture and the areas of the damaged regions increases with time until a final crack of material. By using the correlation function of the fraction of broken fibers, we study the diffusion properties of micro crack created in the composite materials. The results show that the correlation decreases exponentially with time and decreases with both of applied load and temperature. We calculate then the effective diffusion coefficient cracks which increase exponentially with applied load and linearly with the temperature. The failure timetfof the materials decrease with temperature as a power law. Obtained results are compared with the one of the classical model consist of a set of parallel fibers.
Modeling of crack diffusion in composite materials
Authors: Achik I. , Hader A. , Sbiaai H. , Boufass S. , Tanasehte M. , Boughaleb Y 
Published: November 2020

Abstract
Our aim is to investigate the crack diffusion created at single region of composite materials by using the fiber bundle model. So, we have applied an external single crack in one fiber of the composite material, and we then continue to increase this load at a very slow rate until the considered fiber breaks and its load is redistributed to its neighboring intact ones. This breaking and redistribution dynamics repeat itself and this process ensures an advancing interfacial fracture and the area of the damaged region increases with time until a final crack of material. Our calculations are done in the context of the local load-sharing rule. The results show that the damaged region area increases with time by following the Lifshitz-Slyozof law with an exponent growth x=2. This permits us to deduce the behavior of the crack diffusion with the applied load. The corresponding results of the life time materials exhibit an exponential decreasing with the applied load and a linear decreasing with temperature.
Prediction of Mechanical Performance of Natural Fibers Polypropylene Composites: a Comparison Study
Authors: Rouway M. , Nachtane M. , Tarfaoui M. , Chakhchaoui N. , Omari LH. , Fraija F. , Cherkaoui O. 
Published: November 2020

Abstract
The future trends of wind turbine blade materials are mostly centered around utilizing lighter materials with improved life cycle and low cost. In modern wind turbine blade, using green composite or biocomposite is a sustainable solution, especially for small wind turbine blade with natural fiber and biodegradable polymer. In this work, four natural fibers (Alfa, Flax, Sisal and Hemp) are used with Polypropylene (PP) thermoplastic polymer. The objective is to evaluate the elastic muduli of composite by two methods; Analytical Mori Tanaka theory and numerical with Digimat MF. The results show a good validation between the two methods. The comparison of the mechanical behaviour of the transversely isotropic of natural fibers indicate that the hemp have a good performance with high Young and shear modulus regarding to their low density, which can offer an excellent candidate for the manufacturing of small wind turbine blades in rural and isolated areas.
The effect of fibers-matrix interaction on the composite materials elongation
Authors: Tanasehte M , Hader A , Sbiaai H , Achik I , Boughaleb Y 
Published: November 2020

Abstract
Failure process in composite materials is the basis of various actual researches. It study is the almost treated with fiber bundle model (FBM), in the framework of local load sharing rule (LLS), were the breakdown mechanisms is controlled by different parameters. Almost tentative investigates only fiber failure process and neglects the effect of the matrix, as a second crucial component of composite. Effectively, quantification of fibers-matrix interactions is not generally clear. Furthermore, the diversity of composite intrinsic proprieties complicates this quantification. The originality of our investigations is to quantify all interactions between fibers and matrix in a single parameter. Likewise, this latter gives us a different results than the ones obtained with FBM where the interaction amplitude is neglected. Moreover, interaction decelerates the failure process; it subdivides the avalanche phenomena on two consecutive regimes separated by delaying duration. These results are more similar to the ones obtained regular fibers substations. Therefore any fiber have its own elongation, the mean fiber elongation produces an elastic energy. The temporal variation of these latter presents two extremum separated by time duration; at this separated period, the material self-rearranging. These results are more similar to the ones obtained by the regular fibers substitution process.