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Study of the Efficiency of Vertical Drains by an FEM Method in Soil Treatment for Road Projects: Case of the Development and Bitumination Works of the ROCADE Porto-Novo in Benin

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Open Journal of Civil Engineering 2024年第3期14卷 435-455页

作者： Cheikh diallo diène Vitouley Kossi Ghyslain Joël mamadou Tine Apanda Mbongote Johnny Laboratory of Modelling and Soils Mechanics TRU Engineering Sciences (UFR SI) University Iba Der Thiam Thies Senegal Laboratory of Modelling and Soils Mechanics School of Electrical and Building (ESEBAT) Dakar Senegal

This article aims to study the efficiency of coupled vertical drains for the treatment of long-lasting compressible clay soils for the road project platform of the ring road of Porto Novo, capital of Benin. The experimental data allowed us to estimate a consolidation of 29% in 9 months, justifying the drainage of the soil. In order to study the efficiency of drainage, a FEM model was proposed simulating different scenarios. These include a drainless road, pavements equipped with vertical drains with meshes of 0.5 m 0.5 m, 1 m 1 m and 1.5 m 1.5 m respectively and horizontal drains. The results expressed in terms of variations in vertical stresses, effective stresses and shear deformations revealed significant variations in pavement performance depending on the mesh size of the vertical drains. The configuration with a mesh of 0.5 m 0.5 m showed the least deformations, thus indicating a reduction in deformations and better stress distribution. However, the other mesh configurations showed variable results, underlining the importance of choosing the right mesh for the specific project conditions.

关键词： Pavement Vertical Drains Horizontal Drains Modelling Plaxis2D ROCADE de Porto-Novo

diabetes Screening and Cardiovascular Risk in Tuberculosis Patients in Conakry and Surrounding Towns

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Open Journal of Endocrine and Metabolic diseases 2024年第1期14卷 7-13页

作者： mamadou Chérif diallo mamadou dian Mamoudou diallo Mody Abdoulaye Barry Kadija dieng Alpha mamadou diallo mamadou Mansour diallo Oumou diallo Amadou Kaké Gamal Abdel Nasser University of Conakry Conakry Guinea Endocrinology-diabetology Department of Donka University Hospital Conakry Guinea Foundation for The Fight against diabetes and Non-Communicable diseases Conakry Guinea

Objective: To determine the prevalence of diabetes and the level of cardiovascular risk in tuberculosis patients treated in Conakry and surrounding towns. Method: This was a cross-sectional study carried out at tuberculosis treatment centers in Conakry and surrounding towns (Coyah and Dubréka) on World TB Day, November 14, 2022, among 350 tuberculosis patients. We determined the proportion of TB patients with diabetes and high hyperglycemia. We determined the Chi-square to identify the factors associated with the occurrence of diabetes in tuberculosis patients, and a significance threshold with p Results: The average age of participants was 33.5 ± 14.5 years, and they were predominantly male (59.7%). The majority of participants lived in Conakry (96.3%). 5.7% were known diabetics and 4.6% were known hypertensives. We found a prevalence of diabetes of 9.4%. Among diabetics, 39% were diabetes discoveries. 30% were hypertensive or had high blood pressure. Of these hypertensive patients, 26.4% were unrecognized hypertensives. Age and hypertension were statistically significantly associated with the onset of diabetes in tuberculosis patients. Medium, high and very high levels of cardiovascular risk were present in 23.4%, 8.9% and 3.4% respectively. Conclusion: diabetes is common in tuberculosis patients. Cardiovascular risk factors, notably hypertension and cardiovascular risk level, are frequently associated with tuberculosis. Tuberculosis patients with cardiovascular risk factors should be screened for diabetes.

关键词： Screening diabetes Tuberculosis Cardiovascular Risk Conakry

Frequency and Risk Factors of Neonatal Macrosomia at Labe Regional Hospital in Guinea

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Open Journal of Endocrine and Metabolic diseases 2024年第2期14卷 26-32页

作者： mamadou dian Mamoudou diallo mamadou Mansour diallo mamadou Chérif diallo Alpha mamadou diallo Kadija dieng Mody Abdoulaye Barry mamadou Alpha diallo Kadidiatou Bah Abdou Mazid diallo El’hadj Zainoul Bah mamadou Malal Bori diallo mamadou Sanou Sylla Amadou Kaké diabetes Unit Labe Regional Hospital Labe Guinea Faculty of Health Sciences and Technology University of Conakry Conakry Guinea Department of diabetes and Endocrinology Donka Hospital and University Center Conakry Guinea Neonatology Unit Labe Regional Hospital Labe Guinea

Macrosomia is defined as a term birth weight greater than or equal to 4000 grams, or greater than the 90 percentile of intrauterine growth curves. Excessive weight has harmful consequences for the newborn and is a major health concern. Objectives: To determine the frequency of neonatal macrosomia, describe risk factors and neonatal and maternal complications. Materials and methods: This was a cross-sectional study carried out between January and December 2022, involving newborns whose birth weight was greater than or equal to 4000 grams admitted to the neonatology unit of the Labe regional hospital. Results: 591 deliveries were recorded, 15 of which were macrosomic, representing a frequency of 2.54%. The average age of the women was 30.26 years. History of fetal macrosomia and diabetes was 93.33 and 71.43% respectively. The mean gestational age was 38.71 ± 0.75 SA, the mean antenatal consultation was 3 ± 0.8 and the mode of delivery was caesarean section (66.67%). Third-trimester ultrasound was performed in 53.33% of cases. Macrosomic newborns were male in 80% of cases. Neonatal complications were asphyxia (60%), hypoglycemia (20%) and hypocalcemia (13.33%). Factors associated with neonatal macrosomia were diabetes (P dity among newborns hospitalized in the neonatology unit of the Labé regional hospital. Screening for macrosomia risk factors during pregnancy is essential to prevent perinatal complications.

关键词： Frequency Macrosomia Labe

Microbiological and Physico-Chemical Analysis of the Waters of the “Mamouwol” Stream in the Urban district of Mamou (Republic of Guinea)

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Journal of Water Resource and Protection 2024年第8期16卷 559-568页

作者： mamadou Lamarana Souare mamadou Madaniou Sow Saran Camara Adama Moussa Sakho Technical Department of Laboratory Superior Institute of Technology Mamou Republic of Guinea Study and Research Center in the Environment (CERE) Gamal Abdel Nasser University of Conakry Republic of Guinea

Water is essential to life and to the sustainable socio-economic development of a nation, It is therefore interesting to have a better knowledge of the quality of this water. The aim was to determine the degree of microbiological and physico-chemical pollution of the water of the “Mamouwol” river in the town of Mamou. To do this, we chose four (4) sampling sites spread throughout the town of Mamou. During the month of March (2024), 4 water samples were analyzed to monitor the water quality of this river. The average values of the flora analyzed show that these water are heavily contaminated with bacteria indicative of fecal and metal pollution. This study showed that sites: Mam4;Mam2 and Mam1 contain the highest loads, with Total Coliform counts ranging from 1534 CFU/100 ml to 2100 CFU/100 ml, the number of faecal coliforms varies between 526 and 1240 CFU/100 ml, and that of faecal streptococci between 526 and 841 CFU/100 ml. Metal content, BOD5 and COD all comply with the laboratory’s analysis criteria, although they vary from point to point.

关键词： Pollution Water Watercourses Waterborne diseases Microbiological Analysis

Congenital Heart disease Referred for Surgery: Analysis and Epidemiological Description in the Cardiology Department of CHU Ignace Deen

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World Journal of Cardiovascular diseases 2024年第4期14卷 234-251页

作者： Bah mamadou Bassirou diallo mamadou Tahirou Doumbouya Amadou dioulde Balde Elhadj Yaya Camara Abdoulaye diallo mamadou Balde Thierno Siradio Bah Abdoulaye Bah mamadou dian Samoura Sana Balde mamadou Dadhi Cardiology Department of the Ignace Deen Hospital Conakry Guinea

Introduction: Congenital heart disease includes all cardiac and vascular malformations. It accounts for approximately one third of all congenital malformations and is a public health problem, particularly in developing countries. The aim of this study was to analyze the epidemiological, clinical and paraclinical aspects of congenital heart disease. Methods: This was a retrospective descriptive and analytical study based on the records of 135 patients referred for surgery and followed up in the cardiology department of the Ignace Deen University Hospital, collected in November 2022. Results: Hospital prevalence was 5%. The mean age was 71 months, ranging from 1 month to 19 years. The age group over 24 months was the most represented (62%). The M/F sex ratio was 1.36. Urban origin was predominant (58%). The rate of children not attending school or dropping out was high (16%). Siblings with fewer than 4 children were the most common (88%). A heart murmur was the most frequent sign (78%), followed by cyanosis (36%) and heart failure (29%). The association between heart murmurs and CHD was proven with a p-value Conclusion: CHDs represent the main indication for paediatric cardiac surgery and follow-up (95%). We stress the importance of implementing a screening and management strategy for congenital heart disease.

关键词： Congenital Heart disease Cardiology Epidemiology Surgery Ignace Deen University Hospital

Overview of Factors Affecting Dust Deposition on Photovoltaic Cells and Cleaning Methods

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Smart Grid and Renewable Energy 2024年第1期15卷 49-78页

作者： mamadou Tamboura Ekaterina Alexandrovna Gosteva Institute of New Materials National University of Science and Technology MISIS Moscow Russia

Dust deposition on the surface of photovoltaic (PV) cells poses a significant challenge to their efficiency, especially in arid regions characterized by desert and semi-desert conditions. Despite the pronounced impact of dust accumulation, these regions offer optimal solar radiation and minimal cloud cover, making them ideal candidates for widespread PV cell deployment. Various surface cleaning methods exist, each employing distinct approaches. Choosing an appropriate cleaning method requires a comprehensive understanding of the mechanisms involved in both dust deposition on module surfaces and dust adhesion to PV cell surfaces. The mechanisms governing dust deposition and adhesion are complex and multifaceted, influenced by factors such as the nature and properties of the dust particles, environmental climatic conditions, characteristics of protective coatings, and the specific location of the PV installation. These factors exhibit regional variations, necessitating the implementation of diverse cleaning approaches tailored to the unique conditions of each location. The first part of this article explores the factors influencing dust deposition on PV cell surfaces, delving into the intricate interplay of environmental variables and particle characteristics. Subsequently, the second part addresses various cleaning methods, offering an analysis of their respective advantages and disadvantages. By comprehensively examining the factors influencing dust accumulation and evaluating the effectiveness of different cleaning strategies, this article aims to contribute valuable insights to the ongoing efforts to optimize the performance and longevity of photovoltaic systems in diverse geographical contexts.

关键词： Solar Energy Dust Deposition Cleaning Methods

Causes and Prognosis of Cases of Acute Obstructive Renal Failure Managed at the Donka National Hemodialysis Center

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Open Journal of Nephrology 2024年第2期14卷 136-146页

作者： Amadou Yaya diallo mamadou Mouctar diallo mamadou dian Barry Kadiatou mamadou Bobo Barry Saikou Oumar diallo Djenabou diallo Soriba Bangoura mamadou Malal diallo Thierno mamadou Oury diallo Mohamed Lamine Kaba Alpha Oumar Bah Department of Nephrology-Hemodialysis CHU Donka Conakry Guinea Faculty of Health Sciences and Techniques Gamal Abdel Nasser University of the Republic of Guinea Conakry Guinea Department of Urology-Andrology CHU Ignace Deen Conakry Guinea

Introduction: Acute obstructive renal failure (AORF) is a frequent clinical situation, secondary to obstruction of the urinary excretory tract. Whatever the cause, urinary tract obstruction suddenly opposes glomerular filtration and is responsible for tubulointerstitial lesions. It accounts for 10% of acute renal failure (ARF). The aim of this study was to identify the causes and prognosis of cases of acute obstructive renal failure managed at the Centre National d’hémodialyse Donka. Material and Methods: This was a prospective descriptive study lasting 6 months, from September 1, 2022 to February 29, 2023. All patients undergoing haemodialysis for acute obstructive renal failure who agreed to participate in the study and whose medical records were complete were included. Results: During the course of the study, we registered 97 haemodialysis patients, including 20 cases (20.62%) of acute obstructive renal failure. The mean age of the patients was 57.8 ± 10.54 years, with a male predominance of 11 cases (55%) and a sex ratio of 1.22. The reasons for consultation were dominated by physical asthenia 11 cases (55%), lumbar pain 9 cases (50%), vomiting 6 cases (30%) and acute urine retention 6 cases (30%). Arterial hypertension 16 cases (80%) and urinary tract infection 10 cases (50%) were the most common antecedents. The etiologies of RAOI were dominated by lithiasis 10 cases (50%), neoplasia 6 cases (30%) and benign prostatic hypertrophy 3 cases (15%). mean creatinine was 1267.60 ± 710.76 μmol/l with extremes of 243 μmol/l and 2822 μmol/l, mean urea was 39.56 ± 18.36, hyperkalemia in 14 cases (70%) and hyponatremia in 8 cases (40%). After hemodialysis, 9 cases (45%) recovered renal function, 4 cases (20%) became chronic and 7 cases (35%) died. Conclusion: The frequency of AKI remains non-negligible in our department, and early detection and prompt management would considerably reduce the morbidity and mortality associated with this pathology.

关键词： Acute Obstructive Renal Failure Hemodialysis Prognosis Donka

Investigation of Anthropogenic Activities along the Mamouwol River in the Urban Commune of Mamou (Republic of Guinea)

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Journal of Environmental Science and Engineering(A) 2024年第1期13卷 15-22页

作者： mamadou Lamarana Souaré Saran Camara Adama Moussa Sakho mamadou Madaniou Sow Laboratory Technique Higher Institute of Technology of MamouMamou 063Republic of Guinea IRLA-Guinea Laboratory Institute for Applied Language Research(IRLA)Conakry 2201Republic of Guinea

The monitoring of our watercourses for their preservation must be an imperative concern of the whole *** aim of this study is to describe the main causes of degradation and destruction of the natural resources of the Mamouwol River in the Mamou *** were collected using a survey method(questionnaire,interviews and observations).The study revealed that extensive agro-pastoral activities are the main socio-economic activity of the population,accounting for 78.5%-90%and 20.30%*** follows(1.2%).Related activities include handicrafts and petty trade;Other human activities:hunting(11%),charcoal burning(58%),brick making and firing(45.6%).Riverbanks and water resources in the vicinity of dwellings are damaged and polluted by socio-economic activities and the use of agricultural *** absence of industrial units on the path for the data collection.

关键词： Natural resources human activity degradation Mamouwol River Mamou.

Oesophageal Mycosis: Epidemiological and Clinical Aspects and Risk Factors for Occurrence in the digestive Endoscopy Unit of the Donka National Hospital, Conakry CHU

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Open Journal of Gastroenterology 2024年第2期14卷 31-40页

作者： diallo mamadou Sarifou Youssouf Oumarou Yaogo Abdoulatif diallo Kadiatou diallo Djéinabou Wann Thierno Amadou Bah mamadou Lamine Yaya diakhaby mamadou Kanté mamadou Aliou Sylla Djibril Hepato-Gastroenterology Department of the Donka National Hospital Conakry Guinea Faculty of Health Sciences and Techniques Gamal Abdel Nasser University Conakry Guinea Centre Hospitalier Universitaire Communautaire de Bangui Internal Medicine Department Bangui République Centrafricaine Hepato-Gastroenterology Department Angré University Hospital Abidjan Ivory Coast Department of Internal Medicine Donka National Hospital Conakry Guinea

Introduction: Oesophageal mycosis (OM) is one of the most common opportunistic infections in patients infected with HIV (Human Immunodeficiency Virus). However, this condition is increasingly observed in immunocompetent subjects. The aim of this study was to determine the endoscopic prevalence, clinical characteristics and risk factors for the occurrence of oesophageal mycosis in our department. Patients and Method: This was a prospective cross-sectional study of all patients who underwent oeso-gastroduodenal fibroscopy during the period from 1st January to 31st December 2022, i.e. one year, at the digestive endoscopy unit of the hepato-gastroenterology department of the Donka CHU national hospital in Conakry. All patients found to have oesophageal mycosis by FOGD were included. The endoscopy was performed using appropriate equipment: A Fujinon 4400 video endoscopy column;Three Fujinon EG 590 video gastroscopes;A hoover;Data were collected using a pre-established survey form and analysed using Epi info software version 6.0.4;Pearson’s Chi2 test as a test of independence and the exact 5% threshold ficher test. Results: Out of 1343 upper gastrointestinal endoscopies performed, 107 cases of oesophageal mycosis were found, representing a prevalence of 7.96%. The mean age was 40 years, with a male predominance of 55.42%. The sex ratio M/F was 1.24. The 45 and over age group was the most affected, with a prevalence of 40.43%, followed by the [35 - 45] age group, with a prevalence of 22.43%. Clinical symptoms were dominated by epigastralgia in 74.76% of cases, followed by odynophagia in 37.38% of cases, nausea and vomiting in 28.03% of cases, and pyrosis in 26.16% of cases. Oesophageal mycosis without oesophagitis was the most common endoscopic finding in 70% of cases. The main associated endoscopic lesions were erythemato-erosive and congestive gastropathy in 28.03% of cases, peptic oesophagitis (9.34%) and gastric ulcer (5.60%). The main risk factor

关键词： Endoscopy CHU Conakry Risk Factors Immunosuppression Oesophageal Mycosis