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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

Numerical investigation of electric field distortion induced by internal defects in composite insulators

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High Voltage 2017年第4期2卷 253-260页

作者： Gbah kone Christophe Volat Hassan Ezzaidi Modeling and Diagnostic of Power Network Equipment Laboratory University of Quebec at Chicoutimi555 Bd.de l'UniversitéQCCanada G7H 2B1

This paper presents an exhaustive study of numerical investigations based on three-dimensional finite-element method modelling of several non-ceramic insulators of 69,110 and 230 kV having different internal semi-conductive defects in terms of size and *** internal defects were positioned close to the high-voltage electrode,the ground electrode and at floating *** simulations effected on the distortion of the axial and radial E-field components close to the insulator shank between *** results obtained showed that the radial E-field component is more sensitive to the presence of an internal defect as it shows a greater distortion in presence of the *** was also observed that the E-field component distortion increases with longer internal defect and that this increase is particularly important for a defect at floating ***,it was demonstrated that the length of the insulator,for a defect of constant length,has no significant influence on the E-field component ***,the results demonstrated that the presence of a grading ring,as used on the 230 kV insulator,does not have any influence on the E-field component distortion,independently of the defect position.

关键词： distortion insulator defect

Contribution to thermochemical studies of 0.8[xB_2O_3-(1-x)SiO_2]-0.2Na_2O glasses

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Chinese Chemical Letters 2009年第2期20卷 245-249页

作者： A.P.Ahoussou J.Rogez A.Yapi V.Mikalean A.kone Laboratoire de Chimie-Physique UFR-SSMTUniversité de Cocody22 BP 582 Abidjan 22Cte d'IvoireFrance Institut des Matériaux de Microélectroniquede Nanoscience de Provence(IM2NP)UMR 6242CNRSUniversité Paul CézanneMarseilleFaculté des Sciences et Techniques de St Jérome13397 Marseille Cedex 20France

Calorimetric measurements in 0.8[xB2O3-（1 - x）SiO2]-0.2Na2O glasses and melts are performed in I-IF calorimetry at 298 K and lead borate calorimetry at 973 K, respectively. Mixing enthalpy is affected by both temperature and composition. At 298 K, the mixing enthalpies are slightly negative and components are miscible at that temperature in the whole composition range. At 973 K, the sign of the mixing enthalpies reflect the tendency to phase separation at silica-rich compositions, which is avoided for kinetic reasons as shown by SEM results. Therefore, one is tempted to consider the quenched 0.8[xB2O3-（1 - x）SiO2-0.20Na2O] glasses and melts as single-phase materials.

关键词： Borosilicate HF calorimetry Lead borate calorimetry Mixing enthalpy

Sigmoid Colon Volvulus: Surgical Management at Kati BSS Hospital (Mali)

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Surgical Science 2019年第3期10卷 76-82页

作者： Koniba Keita Abdoulaye Diarra Salia Coulibaly Sidiki Keita Issa Traore Moussa Doumbia Fadima Tall Daouda Diallo Oulematou Coulibaly Assitan kone Boubacar kone Daouda Konate Amadou Kassongue Moussa salifou Diallo Ismael Konare Drissa Traore Nouhoum Ongoiba General Surgery Department Kati Mali Medical Imaging Department Kati Mali Anesthesia Resuscitation Department Kati Mali Ophthalmology Department of Kati Kati Mali Department of Urology of Kati Kati Mali

The objective of this study was to describe the therapeutic aspects and to evaluate the surgery results of sigmoid Volvulus in the Kati (MALIA) General Surgery Department. Patients and Methods: This was a descriptive study conducted in our General Surgery Department. It took place in two phases for six years: A retrospective phase from January 1st, 2010 to December 31st, 2015 and a prospective phase from January 1st, 2016 to December 31st, 2017. This study has been approved by the Ethics Committee. It’s concerned all the patients operated in the department for colon Volvulus. Results: We collected 70 patients’ files. The Sigmoid Volvulus represented 7.8% of emergency surgery activities and 37.2% of intestinal obstruction. The male sex predominated with 98.57% against 1.43% of the female sex. The average age was 42.11 years old with limits of 18 to 70. The average deadline evolution was 2.53 days with limits of 1 to 3. The sigmoidectomy with immediate anastomosis was performed in 66% of patients, colectomy with 2-times anastomosis: according to Hartman 20% and Bouilly Volkman 11%, detorsion with colopexy 3%. The early morbidity rate was 5.71%. The average duration of hospitalization was 10.8 days with limits of 5 to 40 days. Two deaths were recorded. Conclusion: Sigmoid Volvulus is frequent in young adult sex male in Africa. We did not find any significant difference between the surgical technique and the advent of complications. The Colectomy with immediate anastomosis seems to be ideal to us that anytime the conditions are appropriate.

关键词： Volvulus Sigmoid Colectomy Surgery

Factors Associated with Maternal Mortality at Gynecology and Obstetrics Department in Departmental University Hospital Center of Borgou

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Open Journal of Obstetrics and Gynecology 2021年第8期11卷 1026-1036页

作者： salifou Badariatou Atadé Sèdjro Raoul Sidi Imorou Rachidi Obossou Achille Awede Sounouvi Ernest salifou Kabibou Mother and Child Department Faculty of Medicine (FM) University of Parakou (UP) Parakou Benin

Introduction: Maternal mortality is a robust indicator of human development. Most of it occurs in developing countries. Objectives: This study aims to determine the factors associated with maternal mortality in Gynecology and Obstetrics Department of Borgou Departmental University Hospital Center (CHUD-B). Study method: Our study took place at Gynecology and Obstetrics Department in Borgou Departmental University Hospital Center. This was a descriptive and analytical case-control study, covering a period of 7 years from January 1, 2012 to December 31, 2018. Results: Two hundred and twelve patients have been recruited consisting of 106 deceased women and 106 controls. The intra-hospital mortality ratio was 1100 deaths per 100,000 live births (LB). The mean age of deceased women was 27.06 ±

关键词： Maternal Mortality Ratio Direct Obstetric Causes Indirect Obstetric Causes Factors Associated

An Integrated Approach for Improved Permeability and Reservoir Quality Prediction in Multiporosity Systems， Tahe Ordovician Naturally Fractured Vuggy Carbonates

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Journal of Earth Science 2022年

作者： Issoufou Aboubacar Mahaman salifou Heng Zhang Issoufou Ousmane Boukari Jie Li Cai Zhongxian Université Dan Dicko Dankoulodo de Maradi， Faculté des Sciences et Techniques， Département de Géologie Key Laboratory of Tectonics and Petroleum Resources， Ministry of Education， China University of Geosciences (Wuhan) Université Abdou Moumouni， Faculté des Sciences et Techniques， Département de Géologie

Carbonates present complex pore systems that strongly influence the physical properties and their interrelationships. This study proposes a new approach to establish pore-type mixing-based permeability transforms by integrating well-log and core data. We investigate the influence of pore-structure heterogeneity on permeability and velocity through the rock-frame flexibility factors (γ and γμ)， derivable using standard sonic and density logs. We derive permeability transforms， with correlation coefficients， R of 0.8 to 0.9， from core measurements and pore-structure variations-dependent physical parameters， namely the porosity exponent (m)， Poisson’s ratio (σ)， velocity deviation log (VDL)， and velocity ratio (VR). Through extrapolation using log-data， the m- and VDL- based correlations provide significantly better permeability estimates， with the highest accuracy attained with the m-based correlation， whereas the VR- and σ- based correlations lead to permeability overestimation for high porosities. We plotted log-derived porosity vs. permeability， obtained applying the m-based correlation， to generate consistent porosity-permeability relationships， which account for pore-structure heterogeneity， by sorting the scattering points into distinct groups/trends by considering the variations of pore-structure types and abundance of a specific porosity. For the studied oilfield， three porosity-permeability relationships are identified， with correlation coefficients approaching 0.9， thus validating the approach and supporting its application in petrophysically similar reservoirs.

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女性创业项目有效性的影响因素研究 ——以科托努（贝宁）妇女商业促进中心为例

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女性创业项目有效性的影响因素研究 ——以科托努（贝宁）妇女商...

作者： IBRAHIM salifou MASSAOUDOU 浙江理工大学

学位级别：硕士

In recent years,women have played an important role in the creation of new businesses and in the promotion of economic ***,despite the efforts made,the success rate of women entrepreneurs continues to be lower than that of their men ***'s involvement in economic development has been recognized as important especially,in the area of *** as the central force for economic change requires more women to be involved in its *** entrepreneurship represents a vast untapped source of innovation,job creation and economic growth in the developing *** barriers to women's entrepreneurship are various:Women face greater obstacles in accessing credit,training,networks and information,as well as legal and policy *** 2016,an estimated 163 million women were starting or running new businesses in 74 economies around the *** addition,an estimated 111 million were running established *** not only shows the impact of women entrepreneurs across the globe,but highlights their contributions to the growth and well-being of their *** entrepreneurs provide incomes for their families,employment for their communities,and products and services that bring new value to the world around *** Benin,there are a number of projects to support women and youth *** specific case of our study is the Women Business Promotion Center(WBPC)in order to assess its *** paper examines the factors that affect the achievement of the WBPC objectives and it effectiveness,which also analyzes the factors influencing the effectiveness(or performance)of women Entrepreneurs in Cotonou,*** this end,a survey was carried out among a sample of 120 women and staff members of the Decentralized Financial System in order to verify the research *** research used questionnaire to collect data then the results of the survey were analyzed using simple statistical tools

关键词： Women Entrepreneurship Effectiveness Post Financing Follow-Up

Community knowledge,attitudes and practices related to schistosomiasis and associated healthcare-seeking behaviours in northern Côte d’Ivoire and southern Mauritania

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Infectious Diseases of Poverty 2018年第1期7卷 691-703页

作者： Amoin Jeanne d’Arc Koffi Mohamed Doumbia Gilbert Fokou Moussa Keita Brama kone N’doumy Noel Abe Department of Research and Development Centre Suisse de Recherches Scientifiques en Cote d’IvoireAbidjanCote d’Ivoire Environment and Communication Training Unit University Alassane OuattaraBouakeCote d’Ivoire Ethno-Sociology Institute University Felix Houphouet-BoignyAbidjanCote d’Ivoire Faculty of Letters and Social Sciences University of NouakchottNouakchottMauritania University Peleforo-Gbon-Coulibaly KorhogoCote d’Ivoire

Background:Among parasitic infections,schistosomiasis ranks second after malaria in terms of worldwide *** efforts to contain transmission,more than 230 million people are infected,of which 85%live in Sub-Saharan *** the epidemiologic characteristics of schistosomiasis have been extensively studied across endemic settings,social factors have been paid less *** current study assesses community knowledge of schistosomiasis causes,transmission,signs,symptoms and prevention,as well as healthcare-seeking behaviours in two West African settings,with the aim of strengthening schistosomiasis control ***:From August 2014 to June 2015,we conducted two cross-sectional surveys in Korhogo,Cote d’Ivoire and Kaedi,*** applied a questionnaire to collect quantitative data at the household level in Korhogo(n=1456)and Kaedi(n=1453).Focus group discussions(Korhogo:n=32,Kaedi:n=32)and participatory photography(photovoice)(Korhogo:n=16,Kaedi:n=16)were conducted within the communities to gather qualitative *** addition,semi-structured interviews were used to discuss with key informants from control programmes,nongovernmental organizations and health districts(Korhogo:n=8,Kaedi:n=7).Results:The study demonstrated that schistosomiasis is not well known by the communities;64.1%claimed to know the causes of the disease,but the reality is *** knowledge is more from cultural than biomedical *** was observed that social construction of the disease is different from the biomedical *** Korhogo,schistosomiasis was often associated with several other diseases,notably stomach ulcer and *** populations believe that schistosomiasis is caused by exposure to goat or dog urine in the *** Kaedi,schistosomiasis is considered as a disease transmitted by environmenal elements such as sunshine and dirty *** both settings,the care-seeking pathways were found to be strongly influenced by local c

关键词： Community knowledge Healthcare-seeking behaviour Schistosomiasis Korhogo Kaedi Côte d’Ivoire Mauritania

Assessment of Soil Contamination and Human Health Risk around an Industrial Gold Mine in Côte d’Ivoire: The Case of Arsenic

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Open Journal of Soil Science 2023年第7期13卷 329-339页

作者： Kagbagnan kone Adjoumani Rodrigue Kouakou Département de Géographie UFR Sciences Sociales Université Péléforo Gon Coulibaly Korhogo C&#244te d’Ivoire Laboratoire de Thermodynamique et de Physico-chimie du Milieu UFR Sciences Fondamentales et Appliquées Université Nangui Abrogoua Abidjan C&#244te d’Ivoire

The Tongon mine generates millions of tons of waste rock and tailings, which are stored in landfills in the vicinity of the mine. These tailings contain arsenic. The risk of soil contamination in this area is evident. This study assesses the arsenic contamination of soils around the mine and the health risks to the local population. Soil samples were taken from plastic bags and other materials used as working tools. Arsenic concentrations were determined by inductively coupled plasma mass spectroscopy, after the soil samples had been concentrated and digested. Metal contamination indices were used to assess the degree of soil contamination. The results obtained indicate that soils in the industrial zone of the Tongon gold mine have very high average concentrations, well above the world average for uncontaminated soils of 6 mg/kg arsenic. Geoaccumulation index values range from 1.28 to 3.40. These values highlight severe arsenic soil contamination. The human health risk assessment revealed that exposure risks are well above the critical limit of 1 and are, in descending order, children > adult women > adult men. These results indicate an ecological risk, requiring environmental monitoring, underpinned by the development of an effective remediation strategy to reduce local pollution and contamination.

关键词： Industrial Mine Tongon Pollution Arsenic Soil