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Photovoltaic Models Parameters Estimation Based on Weighted Mean of Vectors

Computers, Materials & Continua 2023年第3期74卷 5229-5250页

作者： Mohamed Elnagi salah Kamel Abdelhady Ramadan Mohamed F.elnaggar Department of Electrical Engineering Faculty of EngineeringAl-Azhar UniversityQena83518Egypt Department of Electrical Engineering Faculty of EngineeringAswan UniversityAswan81542Egypt Department of Electrical Engineering College of EngineeringPrince Sattam Bin Abdulaziz UniversityAl-Kharj11942Saudi Arabia Department of Electrical Power and Machines Engineering Faculty of EngineeringHelwan UniversityHelwan11795Egypt

Renewable energy sources are gaining popularity,particularly photovoltaic energy as a clean energy *** is evident in the advancement of scientific research aimed at improving solar cell *** to the non-linear nature of the photovoltaic cell,modeling solar cells and extracting their parameters is one of the most important challenges in this *** a result,the use of optimization algorithms to solve this problem is expanding and evolving at a rapid *** this paper,a weIghted meaN oF vectOrs algorithm(INFO)that calculates the weighted mean for a set of vectors in the search space has been applied to estimate the parameters of solar cells in an efficient and precise *** each generation,the INFO utilizes three operations to update the vectors’locations:updating rules,vector merging,and local *** INFO is applied to estimate the parameters of static models such as single and double diodes,as well as dynamic models such as integral and fractional *** outcomes of all applications are examined and compared to several recent *** well as the results are evaluated through statistical *** results analyzed supported the proposed algorithm’s efficiency,accuracy,and durability when compared to recent optimization algorithms.

关键词： Photovoltaic(PV)modules weIghted meaN oF vectOrs algorithm(INFO) renewable energy static PV models dynamic PV models solar energy

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COVID-19 and liver diseases,what we know so far

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World Journal of Clinical Cases 2022年第13期10卷 3969-3980页

作者： Mohamed elnaggar Ahmed Abomhya Ismail Elkhattib Nabila Dawoud Rajkumar Doshi Department of Internal Medicine University of Nevada Reno School of MedicineRenoNV 89052United States Department of Internal Medicine The Brooklyn Hospital CenterBrooklynNY 11200United States Department of Internal Medicine University of ConnecticutFarmingtonCT 06030United States Department of Internal Medicine University of KentuckyLexingtonKY 40508United States Department of Cardiology St Joseph's University Medical CenterPatersonNJ 07503United States

Coronavirus disease 2019(COVID-19)pneumonia outbreak started in December *** March 12,2020,the World Health Organization(WHO)declared that the severe acute respiratory syndrome coronavirus 2(sARs-CoV-2)constitutes a pandemic,and as of May 2021,sARs-CoV-2 has infected over 167.3 million patients,including 3.4 million deaths,reported to *** this review,we will focus on the relationship between sARs-CoV-2 infection and the *** will discuss how chronic liver diseases affect the COVID-19 disease course and *** will also discuss the sARs-CoV-2 effects on the liver,mechanisms of acute liver injury,and potential management plans.

关键词： COIVD-19 sARs-CoV-2 Liver diseases Transaminases Non alcoholic fatty liver Hepatocellular carcinoma

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The Vibrational Motion of a Dynamical system Using Homotopy Perturbation Technique

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Applied Mathematics 2020年第11期11卷 1081-1099页

作者： T. s. Amer A. A. Galal s.imaa elnaggar Mathematics Department Faculty of Science Tanta University Tanta Egypt Department of Physics and Engineering Mathematics Faculty of Engineering Tanta University Tanta Egypt Kafrelsheikh Higher Institute of Engineering and Technology Kafrelsheikh Egypt

This paper outlines the vibrational motion of a nonlinear system with a spring of linear stiffness. Homotopy perturbation technique (HPT) is used to obtain the asymptotic solution of the governing equation of motion. The numerical solution of this equation is obtained using the fourth order Runge-Kutta method (RKM). The comparison between both solutions reveals high consistency between them which confirms that, the accuracy of the obtained solution using aforementioned perturbation technique. The time history of the attained solution is represented through some plots to reveal the good effect of the different parameters of the considered system on the motion at any instant. The conditions of the stability of the attained solution are presented and discussed.

关键词： Homotopy Technique Nonlinear Vibration Lagrange’s Equation stability

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A syndrome of Vitamin D3 Deficiency/Fibromyalgia/Hyperparathyroidism Mimicking Rheumatoid Arthritis, a Clinical Prospective study

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Open Journal of Rheumatology and Autoimmune Diseases 2021年第2期11卷 79-88页

作者： Adel Elbeialy Abdlnby Bauomi Basma elnaggar Hala Elzomor Rheumatology Departments Al-Azhar faculty of Medicine Cairo Egypt Radiology Departments Al-Azhar faculty of Medicine Cairo Egypt

Objectives: Rheumatoid arthritis is sometimes misdiagnosed for other diseases, like psoriatic arthritis, erosive OA, viral arthritis, reactive arthritis, IBD arthritis, Lyme’s disease, and palindromic rheumatism. Secondary hyperparathyroidism was not included in the differential diagnosis of RA, though it sometimes presents with joint pains and tenderness, and even arthritis. Fibromyalgia is a psychosomatic disorder characterized by chronic widespread pain and tender areas. Mimicry of some manifestations of these diseases sometimes results in misdiagnosis as RA. Methods: Two hundred patients previously diagnosed as RA from outpatient clinics in Al-Azhar Faculty of Medicine, attended as not responding to medical treatment of RA. All patients were subjected to a re-evaluation of disease activity including HAQ, and DAS 28, CDAI, and SDAI. Also, we measured serum vitamin D3, PTH, total and ionized Calcium, Phosphorus, Uric acid, ACPA, and other routine lab. All patients were exposed to various radiological imaging modalities. Results: Cases not responding to RA treatment were reevaluated and were found to have a syndrome of fibromyalgia associated with vitamin D3 deficiency and secondary hyperparathyroidism. Conclusions: Fibromyalgia/Hyperparathyroidism syndrome is an underdiagnosed disease, which results from chronic vitamin D3 deficiency. SHPT can cause bone erosions, which are mostly shaggy in appearance and distributed in the radiocarpal, radioulnar, metacarpophalangeal and distal interphalangeal joints, in contrast to that which predominate proximal IP joints of rheumatoid arthritis. Radiology of FM/HPT syndrome patients revealed a sign of spur-like excrescences in terminal finger tufts unilaterally or bilaterally, which we think is pathognomonic.

关键词： secondary Hyperparathyroidism Rheumatoid Arthritis Vitamin D3 Cadmium Toxicity Fibromyalgia

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