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Characterization of the Hydrogeological Conditions of Some Portions of the Neoproterozoic Voltaian Supergroup in Northern Ghana

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Journal of Water Resource and Protection 2011年第12期3卷 861-875页

作者： Sandow Mark Yidana aliou abdul-samed Bruce Banoeng-Yakubo Prosper M. Nude 不详

Spatial variations in the essential aquifer parameters obtained through regular aquifer tests were evaluated for some aquifers of the Neoproterozoic sedimentary aquifers of the Voltaian Basin. Ordinary least squares regression models have also been developed to relate aquifer transmissivity and specific capacity, and well yield and transmissivity. These analyses suggest that in the northern parts of the Voltaian, aquifer transmissivity exists in a non-linear relationship with specific capacity and yield. This is in keeping with the findings of previous research in the southern part of the Voltaian, and deviates from the regular Dupuit-Thiem relationship between the two major aquifer parameters. Lithology specific models have been developed in this study. The exponent of the non-linear models appears to be related to the lithology, and tends to approach unity in the mudstone and siltstone aquifers, whilst manifesting obvious departures from nonlinearity amongst the sandstone aquifers. This study finds that the sandstone aquifers are the most prolific and offer themselves as the best lithologies for drilling successful wells in the area. Linear prediction maps suggest that the most prolific aquifers are located in the northern parts of the study area, where aquifer transmissivity, specific capacity, and well yield values are quite high due to enhanced secondary permeabilities. There has been no obvious relationship between the major aquifer parameters and static water levels, which are quite high in the middle and western sections of the study area. The hydrogeological properties of rocks within the Voltaian appear to be based on discrete structural entities which manifest high variability in the study area. Even within the same lithology, standard deviations are quite high in the data for all the aquifer parameters examined in this study.

关键词： Savelugu-Nanton Regression Specific Capacity Transmissivity Yield Kriging

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Using Extreme Value Theory Approaches to Estimate High Quantiles for Stroke Data

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Open Journal of Statistics 2024年第1期14卷 150-162页

作者： Justin Ushize Rutikanga aliou Diop Charline Uwilingiyimana African Institute of Mathematical Sciences Rwandan Center Kigali Rwanda College of Agriculture Animal Sciences and Veterinary Medicine (CAVM) University of Rwanda Musanze Rwanda LERSTAD Gaston Berger University Saint Louis Senegal Department of Statistics Applied to Economy INES Ruhengeri Institute of Applied Sciences Musanze Rwanda

This paper aims to explore the application of Extreme Value Theory (EVT) in estimating the conditional extreme quantile for time-to-event outcomes by examining the functional relationship between ambulatory blood pressure trajectories and clinical outcomes in stroke patients. The study utilizes EVT to analyze the functional connection between ambulatory blood pressure trajectories and clinical outcomes in a sample of 297 stroke patients. The 24-hour ambulatory blood pressure measurement curves for every 15 minutes are considered, acknowledging a censored rate of 40%. The findings reveal that the sample mean excess function exhibits a positive gradient above a specific threshold, confirming the heavy-tailed distribution of data in stroke patients with a positive extreme value index. Consequently, the estimated conditional extreme quantile indicates that stroke patients with higher blood pressure measurements face an elevated risk of recurrent stroke occurrence at an early stage. This research contributes to the understanding of the relationship between ambulatory blood pressure and recurrent stroke, providing valuable insights for clinical considerations and potential interventions in stroke management.

关键词： Censored Data Conditional Extreme Quantile Kernel Estimator Weibull Tail Coefficient

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Diversity and Structure of the Woody Stand in a Sudano-Sahelian Transition Zone in Senegal

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Open Journal of Ecology 2024年第1期14卷 1-16页

作者： Oumar Sarr Moustapha B. Sagna Amy Bakhoum Sékouna Diatta aliou Guissé UCAD/FST Laboratory of Ecology and Ecohydrology Dakar Senegal Tessekere Human Environment Observatory (Senegal) IRL 3189 “Environment Health Society” Dakar Senegal

The main objective of the study was to investigate the diversity of the woody stratum of the vegetation in intercommunity rangelands in the department of Koungheul based on an ecological inventory using vegetation surveys. The results indicate a rich flora of 70 species divided into 54 genera and 27 families where Ceasalpiniaceae and Rubiaceae are dominant (5 genera each). They are followed by Combretaceae and Euphorbiacea (4 genera each) and by Capparaceae, Fabaceae and Mimosaceae (3 genera for each family). But at the specific level, it is the Combretaceae which dominates with 10 species and Rubiaceae (7 species). It is more representative at the level of the rural community of Lour Esacale. The different values of vegetation parameters from one site to another indicate variability in community rangeland management practices. The woody stand, dominated by small Combretaceae, shows a relatively stable level of organization with an average equitability of about 45% for the two rural communities studied. Species such as Cordyla pinnata, Sclerocarya birrea, Adansonia digitata and Sterculia setigera contributed strongly to the basal and aerial cover of the overall stand. The regeneration of the stand is very good (about 85% on average) but it represents very few species, especially of the Combretaceae family. This shows a tendency to a progressive loss of species richness in the woody stratum.

关键词： Flora Woody Species Vegetation Surveys Regeneration Kaffrine Region

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Morbidity and Mortality Related to Infectious Diseases in the Roi Boudouin Paediatric Ward in Senegal

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Open Journal of Pediatrics 2024年第4期14卷 727-737页

作者： Guillaye Diagne aliou Abdoulaye Ndongo Djeneba Fafa Cissé Sidy Lamine Mbaye Jean Baptiste Niokhor Diouf Fatou Ly Pediatrics Ward of Pikine Hospital Pikine Sngal Pediatrics Ward of Roi Boudouin Hospital Dakar Sngal

Introduction: Infant and child morbidity and mortality linked to infections remain a major concern in both developed and developing countries. The general objective was to determine the characteristics of hospital morbidity and mortality linked to infectious pathologies in the pediatric department of the King Baudouin hospital center in Dakar. Methods: This was a retrospective, descriptive and analytical study focusing on children hospitalized from January 1, 2018 to December 31, 2021 in the pediatric department of the King Baudouin hospital center in Dakar. Results: During the study period, 1474 children were hospitalized for an infectious pathology in the pediatric department. The sex ratio was 1.48. Children aged between one and twelve months represented 34.12%. Morbidity due to respiratory and digestive infections was 42.33% and 33.45%, respectively. Pediatric hospital mortality was 0.75% with a predominance noted in infants between 1 and 12 months (55.86%). Respiratory, digestive infections, sepsis and neurological infections were the main causes of death. Factors associated with mortality were age (1 to 12 months) with p Conclusion: Reducing infant and child mortality linked to infectious diseases remains a crucial challenge to address for improving children’s health. Early detection of related signs, prevention of infections, and adequate care and monitoring of infants and children can contribute to this reduction.

关键词： Morbidity Mortality Infections Children

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Development of a Web-Based GIS of Flood Zones in the Municipality of Ouagadougou in Burkina Faso

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Journal of Geographic Information System 2024年第1期16卷 32-43页

作者： Halidou Kafando Blaise Ouedraogo Vincent Nduka Ojeh Andreas Rienow aliou Gadiaga Ibrahim Elh Maman Garba WASCAL Graduate Research Programme on Climate Change and Education Department of Agriculture and Environment Science University of The Gambia Kanifing The Gambia Institute of Environment and Agricultural Research Ouagadougou Burkina Faso Department of Geography Faculty of Social Sciences Taraba State University Jalingo Nigeria Interdisciplinary Geographic Information Science Institute of Geography Ruhr-University Bochum Bochum Germany WASCAL Graduate Research Programme on Climate Change and Human Habitat University of Mina Mina Nigeria

This document describes the creation of an informative Web GIS aimed at mitigating the impacts of flooding in the municipality of Ouagadougou, in Burkina Faso, a region that is highly sensitive to climate change. Burkina Faso, which is undergoing rapid urbanization, faces major natural threats, particularly flooding, as demonstrated by the severe floods of 2009 that caused loss of life, injury, structural damage and economic losses in Ouagadougou. The aim of this research is to develop a web map highlighting the municipality’s flood-prone areas, with a view to informing and raising awareness of flood risk reduction. Using the Leaflet JavaScript mapping library, the study uses HTML, CSS and JavaScript to implement web mapping technology. Data on Ouagadougou’s flood zones is generated by a multi-criteria analysis combining Saaty’s AHP method and GIS in QGIS, integrating seven (7) parameters including hydrography, altitude, slope, rainfall, soil types, land use and soil moisture index. QGIS processes and maps the themes, PostgreSQL with PostGIS serves as the DBMS and GeoServer functions as the map server. The Web GIS platform allows users to visualize the different flood risks, from very low to very high, or the high-risk areas specific to Ouagadougou. The AHP calculations classify the municipality into five flood vulnerability zones: very low (24.48%), low (27.93%), medium (23.01%), high (17.11%) and very high (7.47%). Effective risk management requires communication and awareness-raising. This online mapping application serves as a tool for communication, management and flood prevention in Ouagadougou, helping to mitigate flood-related natural disasters.

关键词： Web GIS Flood Mapping Leaflet JavaScript Mapping Library Analysis Hierarchical Processes (AHP) Climate Change Adaptation Ouagadougou Municipality

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Influence of Topography on the Distribution and Structure of Woody Plants in the Senegalese Sahel (Sandy Ferlo)

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American Journal of Plant Sciences 2024年第1期15卷 14-28页

作者： Moustapha Bassimbe Sagna Aïssatou Ndong Thiam Khoudia Niang Oumar Sarr Aly Diallo Sekouna Diatta Daouda Ngom aliou Guissé Department of Plant Biology Faculty of Science and Technology Cheikh Anta Diop University Dakar Senegal IRL 3189 “Environment Health Society” Tessekere Human Environment Observatory (Senegal) Dakar Senegal Department of Agronomy and Plant Production El Hadji Ibrahima Niasse University Kaolack Senegal Department of Agroforestry Assane Seck University Ziguinchor Senegal

This study describes the floristic composition and structure of a woody stand in the Senegalese Sahel, paying particular attention to the edaphic factors of its floristic composition. A stratified inventory considering the different relief units was adopted. Woody vegetation was surveyed using a dendrometric approach. The results obtained show that the flora is dominated by a few species adapted to drought, such as Balanites aegyptiaca (L.) Del., Calotropis procera Ait. and Boscia senegalensis (Pers.). The distribution of this flora and the structure of the ligneous plants are linked to the topography. In the lowlands, the flora is more diversified and the ligneous plants reach their optimum level of development compared with the higher relief areas. In the lowlands, there are a few woody species which, in the past, were indicative of better climatic conditions. These are Anogeissus leiocarpus (DC.), Commiphora africana (A. Rich.), Feretia apodanthera Del., Loeseneriella africana (A. Smith), Mitragyna inermis (Willd.) and Sclerocarya birrea (A. Rich). It is important that their reintroduction into reforestation projects takes account of their edaphic preference.

关键词： Woody Plants Distribution Topography Ferlo Senegal

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Child Victims of Road Traffic Accidents: Epidemiological and Clinical Aspects in the Medical and Surgical Emergency Department of the Donka National Hospital

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Case Reports in Clinical Medicine 2024年第3期13卷 63-72页

作者： Ibrahima Sory Diallo Mamadou Moustapha Diop Amadou Oury Toure Mamadou aliou Doukouré Aîssata Barry M’mah Aminata Bangoura Mariama Sadjo Diallo Abdoulaye Oumare Diallo Salimatou Hassimiou Camara Thierno Mamadou aliou Touré Ouo Ouo Kolié Mohamed Lamine Diallo Fatoumata Binta Diallo Ibrahima Sory Souaré Institute of Child Nutrition and Health Conakry Guinea Department of Pediatrics Donka National Hospital Conakry Guinea UNICEF-Guinea Community Health Section Conakry Guinea Gamal Abdel Nasser University of Conakry Conakry Guinea

Introduction: Children involved in road accidents most often suffer head or limb injuries. The severity of these injuries varies according to the age of the child, the type of road user and whether or not protective devices are used. The aim of this study was to carry out a census of admissions and to identify the epidemiological and clinical profile of children involved in road traffic accidents at Donka National Hospital. Methods: This is a descriptive cross-sectional study of children involved in traffic accidents over a 3-month period from September 1 to November 30, 2021. All children admitted to the emergency department for a traffic accident were included in the study. Results: During the study period, 435/530 children (82.1%) were victims of road accidents. Boys accounted for 54.94% of cases, compared with 45.06% for girls. The age group most affected was 12-17 years old (48.97%). October had the highest accident rate (36.4%). Pedestrians are most affected (52.87%). Bicycles and mopeds were involved in 59.77% of accidents. Head injury was the most frequent pathology (33.33%). The study showed that 12.64% of victims were referred to intensive care, pediatric surgery, etc. We recorded 8 cases of death (1.84%). Conclusion: This study highlighted the characteristics, incidence and risk factors for accidents in children admitted to emergency departments. Accident prevention, particularly serious accidents in children, requires more precise knowledge of the factors and circumstances leading to their occurrence.

关键词： Child Accident Public Highway Donka

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Totally Occluded Coarctation of the Aorta in a Young Adult

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World Journal of Cardiovascular Diseases 2024年第4期14卷 282-287页

作者： Marguerite Téning Diouf Mohamed Leye Joseph Salvator Mingou Aw Fatou Ndeye Faye Sy Aimé Mbaye Malick Bodian aliou Alassane Ngaidé Abdoul Kane Cardiology Dalal Jamm Hospital Dakar Senegal Training and Research in Health Sciences Unit University of Thi&#232s Thi&#232s Senegal Cardiology Department Hospital Aristide Le Dantec Dakar Senegal

We report the case of a 20-year-old female patient presenting with a totally occluded coarctation of the aorta. The patient was admitted for the evaluation of resistant grade III high blood pressure. The physical examination revealed a blood pressure gradient between the upper and lower limbs, absent femoral pulses, a diffuse continuous murmur over the chest, and hyperpulsatility of the carotid arteries and sternal notch. A transthoracic echocardiography outlined a narrowing in the caliber of the isthmic aorta without acceleration of flow or gradient. Thoracic CT angiography revealed a complete aortic coarctation with interruption of continuity between segment 3 and the descending aorta.

关键词： Coarctation of Aorta Complete Aortic Occlusion High Blood Pressure Adult

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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

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Evaluation of Hepatic Fibrosis and Hepatic Steatosis by Pulse Elastography (FIBROSCAN/CAP) in Asymptomatic Patients about 170 Cases at the Donka CHU National Hospital in Conakry

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Open Journal of Gastroenterology 2024年第4期14卷 125-138页

作者： Mamadou Sarifou Diallo Oumarou Youssouf Abdoulatif Yaogo Djenabou Diallo Kadiatou Diallo Thierno Amadou Wann Ahmed Tidiane Diallo Mamadou Lamine Yaya Bah Mamdou Diakhaby Mamadou aliou Kanté Djibril Sylla Department of Hepato-Gastroenterology The Donka National Hospital Conakry Guinea Faculty of Health Sciences and Techniques Gamal Abdel Nasser University Conakry Guinea Internal Medicine Department Centre Hospitalier Universitaire Communautaire de Bangui Bangui Central African Republic Department of Hepato Gastroenterology Angr&#233 University Hospital Abidjan Ivory Coast Department of Internal Medicine Donka National Hospital Conakry Guinea

Introduction: Fibroscan is a recent, non-invasive and non-irradiating diagnostic method. It is based on the principle of ultrasound, which enables liver tissue elasticity to be quantified using a probe, and fibrosis to be assessed. Fibroscan measures both elasticity correlated with hepatic fibrosis and CAP correlated with steatosis. The aim of this study was to evaluate hepatic fibrosis and steatosis using pulse elastometry (Fibroscan/CAP). Methods: This was a descriptive and analytical cross-sectional study in which 170 patients were included. It was conducted from October 1 2021 to December 31 2023, i.e. 27 months, in an outpatient clinic in the hepato-gastroenterology department of the Donka national hospital of the CHU Conakry. Results: Of the 170 patients identified, 87 were male (51%) and 83 female (49%), giving a M/F sex ratio of 1.04. The average age of our patients was 40. The 30 - 50 age group was the most affected, with a frequency of 58.23% (n = 99), followed by the 50 age group with a frequency of 29.41% (n = 50). Hepatomegaly, steatotic liver on ultrasonography, transaminase elevation and obesity were the main indications, respectively: (21.76%), (17.65%), (14.71%), and (13.53%). The examinations were requested by hepatogastroenterologists (47.06%), diabetologists (35.88%) and general practitioners (29%). Of the 170 patients, 100 patients (58.82%) had no significant fibrosis F0F1, 39 (22.94%) had moderate fibrosis F2, 20 patients (11.76%) had severe fibrosis F3 and 11 patients (6.47%) had fibrosis F4. Hepatic steatosis: 62 patients (36.47%) had no S0 steatosis;29.41% had S1 steatosis, 20% had S2 steatosis and 24 patients (14.11%) had S3 steatosis. Abdominal ultrasound revealed a normal liver in 67.05% of patients, hepatic steatosis in 29.41% and non-decompensated cirrhosis in 6 cases. Thus, 108 patients had the parameters required to calculate the Fatty Liver Index (FLI), steatosis was present in 20% of our patients, while 29.41% had an undetermined st

关键词： Cirrhosis Fibrosis Fibroscan/CAP Non-Alcoholic Hepatic Steatosis Steatosis CHU Conakry

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