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Experimental and Numerical Investigation on High-Pressure Centrifugal Pumps:Ultimate Pressure Formulation,Fatigue Life Assessment and Topological Optimization of Discharge Section

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Computer Modeling in Engineering & Sciences 2023年第12期137卷 2845-2865页

作者： abdourahamane salifou adam Hatem Mrad Haykel Marouani Yasser Fouad School of Engineering University of Québec in Abitibi-Témiscamingue(UQAT)Rouyn-NorandaQuébecJ9X 5E4Canada National Engineering School of Monastir LGMUniversity of MonastirMonastir5019Tunisia Department of Applied Mechanical Engineering College of Applied EngineeringMuzahimiyah BranchKing Saud UniversityRiyadh11421Saudi Arabia

A high percentage of failure in pump elements originates from *** study focuses on the discharge section behavior,made of ductile iron,under dynamic *** experimental protocol is established to collect the strain under pressurization and depressurization tests at specific *** experimental results are used to formulate the ultimate pressure expression function of the strain and the lateral surface of the discharge section and to validate finite element ***-Safe is then used to assess the fatigue life cycle using different types of fatigue criteria(Coffin-Manson,Morrow,Goodman,and Soderberg).When the pressure is under 3000 PSI,pumps have an unlimited service life of 107 cycles,regardless of the ***,for a pressure of 3555 PSI,only the Morrow criterion denotes a significant decrease in fatigue life cycles,as it considers the average *** topological optimization is then applied to the most critical pump model(with the lowest fatigue life cycle)to increase its fatigue *** the solid isotropic material with a penalization approach,the Abaqus Topology OptimizationModule is *** goal is to reduce the strain energy density while keeping the volume within *** to the findings,a 5%volume reduction causes the strain energy density to decrease from 1.06 to 0.66106 J/m^(3).According to Morrow,the fatigue life cycle at 3,555 PSI is 782,425 longer than the initial 309,742 cycles.

关键词： Centrifugal pump ultimate pressure fatigue life topological optimization

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Hepatic Elastometry in the Management of Hepatitis B at National Hospital of Niamey

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Open Journal of Gastroenterology 2024年第9期14卷 313-321页

作者： Ousseini Fanta Hamidine Illa Moussa Saley Sahada abdourahamane Idrissa Fatouma Abdou Nafissatou Ali Cheik Rakia Abdou Boubé Abdou Djibo Ben Moctar Ky Lawagoulé Joseph Emile Daou Mamane Faculty of Health Sciences Abdou Moumouni University Niamey Niger Department of Hepato-Gastroenterology National Hospital of Niamey Niamey Niger Laboratoire de Recherche Clinique et Systme de Sant Niger Universit Andr Salifou of Zinder Zinder Niger Department of Hepato-Gastroenterology Zinder National Hospital Zinder Niger Department of Infectiology National Hospital of Niamey Niamey Niger Regional Hospital Centre of Niamey Niamey Niger Department of Hepato-Gastroenterology General Reference Hospital of Niamey Niamey Niger Department of Hepato-Gastroenterology The University Hospital Ouagadougou Burkina Faso Department of Internal Medicine General Reference Hospital of Niamey Niamey Niger

Introduction: Viral hepatitis B is a public health problem in Niger which is classified as a high endemicity area with a prevalence ranging from 8 to 17% depending on the studies [1] and that of HBV-related cirrhosis is about 40.26% in 2024. The decision to treat is based on a combination of three parameters: viral load, ALT values and the degree of hepatic fibrosis [2]. The latter is assessed by hepatic elastography (Fibroscan), which is a decisive factor in treatment. In Niger, until 2024, the decision to treat or not to treat a patient with HBV was based on the determination of viral load B and transaminases, and no work evaluating the contribution of this third element, liver elasticity, has been done, hence the interest of our study. Objective: To study the contribution of Fibroscan in measuring hepatic elasticity in the management of patients with HBV. Methodology: This was a prospective descriptive study conducted from January 05 to November 30, i.e. a period of 11 months, on clinically asymptomatic HBsAg-positive patients who had undergone FibroScan liver elasticity measurement. The examination was carried out by a hepatogastroenterologist who had received training in the Fibroscan. The median of ten measures of liver elasticity at the same point with an IQR of less than 30% was considered the valid measure and no or minimal fibrosis was defined as a value ˂7 Kpa, moderate fibrosis as a value between 7 and 10 kpa, severe fibrosis as a value greater than 10 Kpa, and the existence of cirrhosis as a value greater than 14 Kpa were analyzed using SPSS version 20 software. Results: Out of 398 patients monitored for HBV, 60 cases met the inclusion criteria, i.e., a frequency of 15.07%. The mean age of the patients was 35.63 years, with extremes of 18 and 70 years. They were predominantly male, with a sex ratio of 3.2. Married patients accounted for 61.67% (n = 37). Jaundice was absent in 91.67% (n = 55). The circumstances of discovery of HBV were the routine health

关键词： Hepatic Elasticity Fibroscan Fibrosis Hepatitis B Niger

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