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Energy and Power Engineering 2020年第1期12卷 1-15页

作者： Ousmane sow Mamadou Lamine Ba Mohamed Abderrahim Ould el Moujtaba Youssou Traore el hadji sow Cheikh Tidiane Sarr Masse Samba Diop Grégoire Sissoko University Institute of Technology University of Thiès Thiès Sénégal Laboratory of Semiconductors and Solar Energy Physics Department Faculty of Science and Technology University Cheikh Anta Diop Dakar Senegal Ecole Polytechnique de Thiès Thiès Sénégal

In this work, we study the characteristics I-V and P-V of a silicon solar cell as well as its fill factor, its electrical power from the optimum thickness obtained in the base under variation of the irradiation energy flow of charged particles. The recombination velocity at the junction corresponding to the maximum power point was also deduced.

关键词： Silicon Solar Cell Flow Irradiation Energy Recombination Velocity Optimum Base Thickness

Surface Recombination Concept as Applied to Determinate Silicon Solar Cell Base Optimum Thickness with Doping Level Effect

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World Journal of Condensed Matter Physics 2019年第4期9卷 102-111页

作者： Masse Samba Diop Hamet Yoro Ba Ndeye Thiam Ibrahima Diatta Youssou Traore Mamadou Lamine Ba el hadji sow Oulymata Mballo Grégoire Sissoko Laboratory of Semiconductors and Solar Energy Physics Department Faculty of Science and Technology University Cheikh Anta Diop Dakar Senegal Laboratory of Sciences and Techniques of Water and Environment Polytechnic School of Thiès Thiès Senegal.

New expressions of back surface recombination of excess minority carriers in the base of silicon solar are expressed dependent on both, the thickness and the diffusion coefficient which is in relationship with the doping rate. The optimum thickness thus obtained from the base of the solar cell allows the saving of the amount of material needed in its manufacture without reducing its efficiency.

关键词： Silicon Solar Cell Surface Recombination Velocity Diffusion Coefficient Doping Rate Base Thickness

AC Recombination Velocity in the Back Surface of a Lamella Silicon Solar Cell under Temperature

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Journal of Modern Physics 2019年第10期10卷 1235-1246页

作者： Youssou Traore Ndeye Thiam Moustapha Thiame Amary Thiam Mamadou Lamine Ba Marcel Sitor Diouf Ibrahima Diatta Oulymata Mballo el hadji sow Mamadou Wade Grégoire Sissoko Laboratory of Semiconductors and Solar Energy Physics Department Faculty of Science and Technology University Cheikh Anta Diop Dakar Senegal Laboratory of Sciences and Techniques of Water and Environment Polytechnic School of Thiès Thiès Senegal University Assane SECK Ziguinchor Senegal

The ac recombination velocity of the excess minority carriers, in the back surface of a silicon solar cell with a vertical junction connected in series, is developed through Einstein’s law giving the diffusion coefficient of minority carriers according to temperature, through mobility. The frequency spectrum of both, amplitude and phase, are produced for the diffusion coefficient and the recombination velocity in the rear face, in order to identify the parameters of equivalent electric models.

关键词： Vertical Multi-Junctions Solar Cell AC Back Surface Recombination Velocity Temperature Bode and Nyquist Diagrams

A Synergistic Multi-Attribute Decision-Making Method for Educational Institutions Evaluation Using Similarity Measures of Possibility Pythagorean Fuzzy Hypersoft Sets

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Computer Modeling in Engineering & Sciences 2025年第1期142卷 501-530页

作者： Khuram Ali Khan Saba Mubeen Ishfaq Atiqe Ur Rahman Salwa el-Morsy Department of Mathematics University of SargodhaSargodha40100Pakistan Department of Mathematics University of Management and TechnologyLahore54000Pakistan Department of Mathematics College of ScienceQassim UniversityBuraydah51452Saudi Arabia

Due to the numerous variables to take into account as well as the inherent ambiguity and uncertainty,evaluating educational institutions can be *** concept of a possibility Pythagorean fuzzy hypersoft set(pPyFHSS)is more flexible in this regard than other theoretical fuzzy set-like models,even though some attempts have been made in the literature to address such *** study investigates the elementary notions of pPyFHSS including its set-theoretic operations union,intersection,complement,OR-and *** results related to these operations are also modified for ***,the similarity measures between pPyFHSSs are formulated with the assistance of numerical examples and ***,an intelligent decision-assisted mechanism is developed with the proposal of a robust algorithm based on similarity measures for solving multi-attribute decision-making(MADM)problems.A case study that helps the decision-makers assess the best educational institution is discussed to validate the suggested *** algorithmic results are compared with the most pertinent model to evaluate the adaptability of pPyFHSS,as it generalizes the classical possibility fuzzy set-like theoretical ***,while considering significant evaluating factors,the flexibility of pPyFHSS is observed through structural comparison.

关键词： Hypersoft set Pythagorean fuzzy hypersoft set computational complexity multi-attribute decision-making optimization similarity measures uncertainty

Solid Waste Management:A MADM Approach Using Fuzzy Parameterized Possibility Single-Valued Neutrosophic Hypersoft Expert Settings

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Computer Modeling in Engineering & Sciences 2025年第1期142卷 531-553页

作者： Tmader Alballa Muhammad Ihsan Atiqe Ur Rahman Noorah Ayed Alsorayea Hamiden Abd el-Wahed Khalifa Department of Mathematics College of SciencesPrincess Nourah bint Abdulrahman UniversityRiyadh11671Saudi Arabia 2 Department of Mathematics University of Management and TechnologyLahore54000Pakistan Department of Mathematics College of ScienceQassim UniversityBuraydah51452Saudi Arabia

The dramatic rise in the number of people living in cities has made many environmental and social problems *** search for a productive method for disposing of solid waste is the most notable of these *** scholars have referred to it as a fuzzy multi-attribute or multi-criteria decision-making problem using various fuzzy set-like approaches because of the inclusion of criteria and anticipated *** goal of the current study is to use an innovative methodology to address the expected uncertainties in the problem of solid waste site *** characteristics(or sub-attributes)that decision-makers select and the degree of approximation they accept for various options can both be indicators of these *** tackle these problems,a novel mathematical structure known as the fuzzy parameterized possibility single valued neutrosophic hypersoft expert set(ρˆ-set),which is initially described,is integrated with a modified version of Sanchez’s *** this,an intelligent algorithm is *** steps of the suggested algorithm are explained with an example that explains *** compatibility of solid waste management sites and systems is discussed,and rankings are established along with detailed justifications for their *** study’s strengths lie in its application of fuzzy parameterization and possibility grading to effectively handle the uncertainties embodied in the parameters’nature and alternative approximations,*** uses specific mathematical formulations to compute the fuzzy parameterized degrees and possibility grades that are missing from the prior *** is simpler for the decisionmakers to look at each option separately because the decision is *** the computed results,it is discovered that they are consistent and dependable because of their preferred properties.

关键词： Hypersoft expert set Sanchez’s method decision making optimization solid waste management possibility grade fuzzy parameterization

β-divergence loss for the kernel density estimation with bias reduced

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Statistical Theory and Related Fields 2021年第3期5卷 221-231页

作者： Hamza Dhaker el hadji Deme Youssou Ciss Mathematiques et statistique Universite de MonctonMonctonCanada UFR SAT Universite Gaston BergerSaint-LouisSenegal

In this paper,we investigate the problem of estimating the probability density *** kernel density estimation with bias reduced is nowadays a standard technique in explorative data analysis,there is still a big dispute on how to assess the quality of the estimate and which choice of bandwidth is *** framework examines the most important bandwidth selection methods for kernel density estimation in the context of with bias *** reference,least squares cross-validation,biased cross-validation andβ-divergence loss methods are described and expressions are *** order to assess the performance of our various bandwidth selectors,numerical simulations and environmental data are carried out.

关键词： bandwidth β-divergence nonparametric estimatio

Jacobson's Lemma for Generalized Drazin–Riesz Inverses

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Acta Mathematica Sinica,English Series 2023年第3期39卷 481-496页

作者： Soufiane hadji Hassane ZGUITTI Department of Mathematics Dhar El Mahraz Faculty of ScienceSidi Mohamed Ben Abdellah UniversityP.O.Box 1796 Fes-Atlas30003 Fez Morocco

For bounded linear operators A,B,C and D on a Banach space X,we show that if BAC=BDB and CDB=CAC then I-AC is generalized Drazin-Riesz invertible if and only if I-BD is generalized Drazin-Riesz invertible,which gives a positive answer to Question 4.9 in Yan,Zeng and Zhu[Complex *** 14,Paper No.12(2020)].In particular,we show that Jacobson’s lemma holds for generalized Drazin-Riesz inverses.

关键词： Jacobson's lemma Drazin inverse generalized Drazin-Riesz inverse

Optimization of a Solar Chimney with a Horizontal Absorber for Building Ventilation:A Case Study

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Fluid Dynamics & Materials Processing 2023年第4期19卷 901-910页

作者： el hadji I Cisse Baye Alioune Ndiogou Soumaïla Tigampo Ababacar Thiam DorothéAzilinon (L3EPI)Laboratory of ESP-UCAD DakarSenegal Center for Energy Research and Sustainability DAUSTDakarSenegal Universiy Alioune Diop of Bambey BambeySenegal

A study is conducted to optimize the geometry of a solar chimney equipped with a horizontal absorber in order to improve its performances in relation to the provision of *** problem is tackled through numerical solution of the governing equations for mass,momentum and energy in their complete three-dimensional and unsteady *** numerical framework also includes a turbulence model(k-ε)and a radiant heat transfer(DO)***,a Multi-Objective Genetic Algorithm(MOGA)is employed to derive the optimal configuration of the considered solar *** is shown that an air velocity of 0.2 m/s can be *** value is the minimum allowed air velocity according to the ASHRAE’s(American Society of Heating,Refrigerating and Air-Conditioning Engineers)adaptive comfort approach.

关键词： Natural ventilation adaptative comfort solar chimney fluent MOGA

Effect of the Covid-19 Pandemic on Prenatal Consultations for Pathological Pregnancies at the Maternity Unit of Abass Ndao Hospital, Dakar, Senegal

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Open Journal of Epidemiology 2022年第4期12卷 421-430页

作者： Abdoul Aziz Ndiaye Djiby sow Nogaye Dieye el hadji Gueye Boubacar Gueye Alioune Badara Tall Papa Gallo sow Oumar Sidibe Ousseynou Ka Université Alioune Diop de Bambey Bambey Sénégal Université Cheikh Anta Diop de Dakar Dakar Sénégal Centre Hospitalier Abass NDAO Dakar Sénégal Centre Africain d’Etudes Supérieures en Gestion Dakar Sénégal

Introduction: The COVID-19 pandemic has led to changes in health systems. The objective was to assess the effect of Covid-19 on the frequency of prenatal consultations (PNCs) for pathological pregnancies at the Abass NDAO Hospital Centre. Materials and Methods: This was primarily a retrospective study conducted at the Abass NDAO Hospital maternity ward. The target was the medical records of women followed for a pathological pregnancy at maternity from July 2019 to November 2020. Second, the department’s qualified staffs were asked about their experiences with the Covid-19 pandemic. Data collection was carried out between October 2021 and February 2022. Results: A total of 690 prenatal charts for pathological pregnancy were collected: 375 (54%) before the pandemic compared to 315 during Covid-19 (46%). The average age of women was 28.15 years. The age group 25 and 35 was the most represented (36.81%). Reasons for consultation were dominated by threats of premature delivery (51%), followed by severe pre-eclampsia (14%) and premature membrane rupture (11%), respectively. The frequency of prenatal consultations (PNCs) was inversely related to pandemic dynamics and significant monthly variations were observed. Qualified health personnel were midwives (71.40%) and gynecologists (28.60%). During the pandemic, more than the majority of staff (67%) worked 3 days a week, and 24% of health workers 5 days. The majority of staff (60%) reported experiencing overwork during the pandemic. Non-compliance with consultation days was noted in 38% of health providers. Protective equipment was not provided to 14% of the staff. Staff difficulties during prenatal consultations were fear of occupational exposure (12%) and patient reluctance (88%). Conclusion: The Covid-19 pandemic is having a major impact on prenatal consultations for pathological pregnancies at Abass NDAO Hospital. Effective measures must be taken to avoid the consequences of maternal mortality and the functioning of the s

关键词： Pandemic Covid-19 Pathological Pregnancy

Mechanism of Degradation of Rice Starch Amylopectin by Oryzenin Using ONIOM Quantum Calculations [DFT/B3LYP/6-31+G(D, P): AM1]

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Computational Chemistry 2022年第4期10卷 139-156页

作者： Bamba el hadji Sawaliho N’Guessan Boka Robert Laboratoire de Constitution et de Réaction de la Matière UFR SSMT Université Félix Houphou&euml t-Boigny Abidjan C&ocirc te d’Ivoire

Understanding the molecular factors of rice degradation during its aging concerns our research team. This article emphasizes oryzenin-amylopectin. It aims to reveal the mechanism of amylopectin deterioration during rice aging. The research exploits the Natural Bond Analysis and ONION method at theory level DFT/B3LYP/6-31+G(d, p) and AM1. This methodological approach allows highlighting amylopectin transformation;oryzenin converts amylopectin into amyloidosis in continuous. This led to monosaccharides and disaccharides.

关键词： Amylopectin Hydrogen Bond Theoretical Method Starch Oryzenin