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Structural, electronic, and optical studies of chalcogenides stannite Cu_(2)CdSnX_(4)(X=S, Se, and Te): insights from the DFT study

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Optoelectronics Letters 2025年第2期21卷 69-76页

作者： Jamal GUERROUM Mohamed AL-HATTAB Lhoucine MOUDOU Khalid RAHMANI youssef LACHTIOUI Omar BAJJOU Laboratory of Engineering in Chemistry and Physics of Matter Faculty of Sciences and TechnicsSultan Moulay Slimane UniversityBeni Mellal BP 52323000Morocco Ecole Normale Supérieure Mohammed V University in RabatMorocco College of Graduate Studies University of South AfricaPretoriaSouth Africa

In this paper,we have calculated the structural,electronic,and optical properties of chalcogenide stannite Cu_(2)CdSnX4(X=S,Se,Te) *** calculations are based on the density functional theory (DFT) method and are performed using the Cambridge sequential total energy package (CASTEP) code included in the Biovia Material Studio 20 *** optical properties have been studied in a domain that extends energetically from 10 meV to 40 *** results show that Cu_(2)CdSnX4(X=S,Se,Te) stannite exhibits absorption in the visible region,the refractive index decreases with increasing energy,and the refractive index values are n=3.2,3.73 and 3.75 for Cu_(2)CdSnS_(4),Cu_(2)CdSnSe_(4)and Cu_(2)CdSnTe_(4),*** show also high conductivity,which implies that this material is promising for solar *** results argue in favor of the use of these materials in various potential *** density of state,band structures,and structural properties of Cu_(2)CdSnX4(X=S,Se,and Te) stannite are also studied in this work.

关键词： materials electronic refractive

Energy Efficiency of a Solar Green Building Using Bio-Sourced Materials for Indoor Temperature and Humidity Optimization

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Energy Engineering 2025年第1期122卷 41-62页

作者： Soumia Mounir youssef Maaloufa Abdelhamid Khabbazi Elina Mohd Husini Nurul Syala Abdul Latip Yakubu Aminu Dodo Rime EL Harrouni Mina Amazal Asma Souidi Malika Atigui Ahmed Aharoune National School of Architecture Agadir New Complex Ibn ZohrAgadirBP 20732Morocco EMDD CERNE2DUniversity of Mohammed V in RabatEst SaleSaleBP 227Morocco Thermodynamics and Energetics Laboratory Faculty of ScienceIbn Zohr UniversityAgadirBP 8106Morocco Faculty of Built Environment University Sains Islam MalaysiaNilaiBP 71800Malaysia Architectural Engineering Department Najran UniversityNajranBP 1988Saudi Arabia The Centre of Scientific and Engineering Research Najran UniversityNajranBP 1988Saudi Arabia Euro-Mediterranean School of Architecture Design and UrbanismEuro-Mediterranean University of FezFezBP 51Morocco

A clean environment with low carbon emissions is the goal of research on the development of green and sustainable buildings that use bio-sourced materials in conjunction with solar energy to create more sustainable *** is particularly true in Africa,where there aren’t many studies on the *** current study suggests a 90 m^(2) model of a sustainable building in a dry climate that is movable to address the issue of housing in remote areas,ensures comfort in harsh weather conditions,uses solar renewable resources—which are plentiful in Africa—uses biosourced materials,and examines how these materials relate to temperature and humidity control while emitting minimal carbon *** order to solve the topic under consideration,the work is split into two sections:numerical and experimental *** TRNSYS and Revit,the suggested prototype building is examined numerically to examine the impact of orientation,envelope composition made of bio-sourced materials,and carbon *** a hygrothermal investigation,experiments are conducted to evaluate this prototype’s ***,an examination of the photovoltaic system’s production,consumption,and several scenarios used tomaximize battery life is included in the *** the biosourcedmaterial achieves a thermal transmittance of 0.15(W.m^(-2).K^(-1)),the results demonstrate an intriguing finding in terms of *** value satisfies the requirements of passive building,energy autonomy of the dwelling,and injection in-network with an annual value of 15,757 ***,compared to the literature,the heating needs ratio is 6.38(kWh/m^(2).an)and the cooling needs ratio is 49(kWh/m^(2).an),both of which are good *** to international norms,the inside temperature doesn’t go above 26℃,and the humidity level is within a comfortable range.

关键词： Bio-sourced materials energy sustainability green architecture built environment

k-Product Cordial Labeling of Path Graphs

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Open Journal of Discrete Mathematics 2025年第1期15卷 1-29页

作者： Robinson Santrin Sabibha Kruz Jeya Daisy Pon Jeyanthi Maged Zakaria youssef Department of Science and Humanities Vins Christian College of Engineering Nagercoil India Department of Mathematics Holy Cross College Nagercoil India Research Centre Department of Mathematics Govindammal Aditanar College for Women Tiruchendur India Department of Mathematics and Statistics College of Science Imam Mohammad Ibn Saud Islamic University Riyadh Saudi Arabia Department of Mathematics Faculty of Science Ain Shams University Cairo Egypt

In 2012, Ponraj et al. defined a concept of k-product cordial labeling as follows: Let f be a map from V(G)to { 0,1,⋯,k−1 }where k is an integer, 1≤k≤| V(G) |. For each edge uvassign the label f(u)f(v)(modk). f is called a k-product cordial labeling if | vf(i)−vf(j) |≤1, and | ef(i)−ef(j) |≤1, i,j∈{ 0,1,⋯,k−1 }, where vf(x)and ef(x)denote the number of vertices and edges respectively labeled with x (x=0,1,⋯,k−1). Motivated by this concept, we further studied and established that several families of graphs admit k-product cordial labeling. In this paper, we show that the path graphs Pnadmit k-product cordial labeling.

关键词： Cordial Labeling Product Cordial Labeling k-Product Cordial Labeling Path Graph

Photogrammetry and deep learning for energy production prediction and building-integrated photovoltaics decarbonization

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Building Simulation 2024年第2期17卷 189-205页

作者： Ilyass Abouelaziz youssef Jouane CESI LINEACT 7 bis Av.Robert Schuman51100ReimsFrance CESI LINEACT Parc Club des Tanneries 2 all Foulons67380StrasbourgFrance

Building-Integrated photovoltaics(BIPV)have emerged as a promising sustainable energy solution,relying on accurate energy production predictions and effective decarbonization strategies for efficient *** paper presents a novel approach that combines photogrammetry and deep learning techniques to address the problem of BIPV *** method is called BIM-AITIZATION referring to the integration of BIM data,AI techniques,and automation *** integrates photogrammetric data into practical BIM *** addition,it enhances the precision and reliability of PV energy prediction by using artificial intelligence *** primary aim of this approach is to offer advanced,data-driven energy forecasts and BIPV decarbonization while fully automating the underlying *** achieve this,the first step is to capture point cloud data of the building through photogrammetric *** data undergoes preprocessing to identify and remove unwanted points,followed by plan segmentation to extract the plan *** that,a meteorological dataset is assembled,incorporating various attributes that influence energy production,including solar irradiance parameters as well as BIM ***,machine and deep learning techniques are used for accurate photovoltaic energy predictions and the automation of the entire *** experiments are conducted,including multiple tests aimed at assessing the performance of diverse machine learning *** objective is to identify the most suitable model for our specific ***,a comparative analysis is undertaken,comparing the performance of the proposed model against that of various established BIPV software *** outcomes reveal that the proposed approach surpasses existing software solutions in both accuracy and *** extend its applicability,the approach is evaluated using a building case study,demonstrating its ability to generalize effectively to new bui

关键词： building-integrated photovoltaic(BIPV) deep learning building information modeling photogrammetric building decarbonization

DEPENDENCE OF MODULUS OF ELASTICITY AND THERMAL CONDUCTIVITY ON REFERENCE TEMPERATURE IN GENERALIZED THERMOELASTICITY FOR AN INFINITE MATERIAL WITH A SPHERICAL CAVITY

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Applied Mathematics and Mechanics(English Edition) 2005年第4期26卷 470-475页

作者： Hamdy M.youssef Mathematical Department Faculty of Engineering Umm Al_Qura UniversityMakkah Al_Mokaramah P.5555 Saudi Arabia

The equations of generalized thermoelasticity with one relaxation time with variable modulus of elasticity and the thermal conductivity were used to solve a problem of an infinite material with a spherical *** inner surface of the cavity was taken to be traction free and acted upon by a thermal shock to the surface. Laplace transforms techniques were used to obtain the solution by a direct *** inverse Laplace transforms was obtained *** temperature,displacement and stress distributions are represented graphically.

关键词： thermoelasticity generalized thermoelasticity modulus of elasticity thermal conductivity

A numerical investigation into the effect of altering compression ratio, injection timing, and injection duration on the performance of a diesel engine fuelled with diesel-biodiesel-butanol blend

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Clean Energy 2024年第5期8卷 73-96页

作者： Abdulkarim youssef Amr Ibrahim Mechanical Engineering Department Beirut Arab University115020 BeirutLebanon Mechanical Engineering Department Alexandria UniversityAlex 21544Egypt

Using renewable fuels for diesel engines can reduce both air pollution and dependence on fossil fuels.A computer simulation was constructed to predict the performance,combustion characteristics,and NOx emissions of a diesel engine fuelled with diesel-biodiesel-butanol *** simulation was validated by comparing the modelling results against experimental data and a good agreement between the results was *** fuels used for the validation were diesel(B0),biodiesel(B100),diesel-biodiesel blend(B50),and two diesel-biodiesel-butanol blends with 45%diesel-45%biodiesel-10%butanol(Bu10)and 40%diesel-40%biodiesel-20%butanol(Bu20)by *** results showed that the addition of butanol reduced NOx emissions but deteriorated the engine *** aim of the current work was the numerical optimization of the different parameters to enhance the engine performance while using butanol to decrease NOx *** engine compression ratio(CR)varied from 14 to 24,in increments of *** injection timing(IT)was reduced from 30°before top dead centre(bTDC)to 5°bTDC in increments of 5°.Also,the fuel injection duration(IDur)was extended from 20°to 50°in increments of 10°.Results showed that the increase in the CR improved engine performance for the two investigated fuels,Bu10 and *** maximum engine brake power(BP),thermal efficiency(BTE),and minimum brake-specific fuel consumption(BSFC)of 1.46 kW,32.3%,and 0.273 kg/kWh respectively,were obtained when the Bu10 fuel was injected under the optimum conditions of 24 CR,15°bTDC IT,and 40°*** these optimum conditions,the BP,BTE,and BSFC improved by 3%-3.5%for Bu10 and Bu20 fuel blends compared with the base engine conditions of a CR of 22,30°IDur,and 10°bTDC *** heat release rate during the premixed phase increased when the IT was advanced,while the mixing-controlled combustion phase was enhanced when the IT was *** emissions increased with increasing CR,while both an increase in IDur at con

关键词： compression ratio injection timing injection duration butanol biodiesel diesel

State-space approach to two-temperature generalized thermoelasticity without energy dissipation of medium subjected to moving heat source

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Applied Mathematics and Mechanics(English Edition) 2013年第1期34卷 63-74页

作者： H.M.youssef Department of Mathematical Faculty of EducationAlexandria UniversityAlexandria 21527Egypt

In this work, a model of two-temperature generalized thermoelasticity without energy dissipation for an elastic half-space with constant elastic parameters is constructed. The Laplace transform and state-space techniques are used to obtain the general solution for any set of boundary conditions. The general solutions are applied to a specific problem of a half-space subjected to a moving heat source with a constant velocity. The inverse Laplace transforms are computed numerically, and the comparisons are shown in figures to estimate the effects of the heat source velocity and the two-temperature parameter.

关键词： generalized thermoelasticity energy dissipation two-temperature heat source

REAL PALEY-WIENER THEOREMS FOR THE SPACE-TIME FOURIER TRANSFORM

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Acta Mathematica Scientia 2023年第3期43卷 1105-1115页

作者： youssef EL HAOUI Mohra ZAYED Ecole Normale Supérieure(ENS-Meknès) Moulay Ismail UniversityMeknesMorocco Mathematics Department College of ScienceKing Khalid UniversityAbhaSaudi Arabia

This paper presents an extension of certain forms of the real Paley-Wiener theorems to the Minkowski space-time algebra. Our emphasis is dedicated to determining the space-time valued functions whose space-time Fourier transforms(SFT) have compact support using the partial derivatives operator and the Dirac operator of higher order.

关键词： Paley-Wiener theorem Minkowski algebra space-time algebra space-time Fourier transform

Temporal-spatial subspaces modern combination method for 2D-DOA estimation in MIMO radar

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Journal of Systems Engineering and Electronics 2017年第4期28卷 697-702页

作者： youssef Fayad Caiyun Wang Qunsheng Cao College of Electronic and Information Engineering Nanjing University of Aeronautics and Astronautics Nanjing 210016 China College of Astronautics Nanjing University of Aeronautics and Astronautics Nanjing 210016 China

A 2D-direction of arrival estimation (DOAE) for multi input and multi-output (MIMO) radar using improved multiple temporal-spatial subspaces in estimating signal parameters via rotational invariance techniques method (TS-ESPRIT) is introduced. In order to realize the improved TS-ESPRIT, the proposed algorithm divides the planar array into multiple uniform sub-planar arrays with common reference point to get a unified phase shifts measurement point for all sub-arrays. The TS-ESPRIT is applied to each sub-array separately, and in the same time with the others to realize the parallelly temporal and spatial processing, so that it reduces the non-linearity effect of model and decreases the computational time. Then, the time difference of arrival (TDOA) technique is applied to combine the multiple sub-arrays in order to form the improved TS-ESPRIT. It is found that the proposed method achieves high accuracy at a low signal to noise ratio (SNR) with low computational complexity, leading to enhancement of the estimators performance.

关键词： direction of arrival estimation (DOAE) temporal subspace spatial subspace estimating signal parameters via rotational invariance technique (ESPRIT)