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Corneal Trauma: An Epidemiological, Clinical and Therapeutic Study in CADES/O Donka

Open Journal of Ophthalmology 2022年第4期12卷 362-372页

作者： abdoul Karim Balde Sonassa Diane Sidibe Kader aziz abdoul Karim Barry abdoulaye Magassouba Dantouma Maxim Sovogui Thierno Madiou Bah Faculty of Health Sciences and Techniques of Conakry Conakry Guinea CADES/O (Application Center of the Diploma of Specialized Studies in Ophthalmology) Donka Conakry Guinea Bartimé Hospital of Conakry Conakry Guinea

Introduction: Corneal trauma can be defined as any impact on the cornea following direct or indirect trauma by a traumatic agent. Due to its anatomical position, the cornea is the superficial membrane most exposed to ocular trauma. It is a frequent pathology in ophthalmology, especially in young active subjects. It is an important cause of poor vision or loss of the eyeball with a significant socio-economic impact. Material and Method: We conducted a prospective cross-sectional study of descriptive type with a duration of 5 months from November 01, 2020 to March 31, 2021 in order to study the epidemiological, clinical and therapeutic profile of corneal trauma. Results: During the study period, 179 patients consulted for corneal trauma, i.e. 64.9% of ocular trauma. The age group 20 to 29 years old was the most affected with a frequency of 29.1%. The average age of our patients was 26.6 years old, with extremes ranging from 1 to 75 years old. The majority of patients were male with a frequency of 68.2% and a sex ratio of 2.1. Decreased visual acuity was the most frequent reason for consultation in our patients with 93.2%. Perforation was the most frequent type of trauma with 80.3%. All of our patients were treated with medication (100%), 65.3% with physical treatment and 41.8% with surgery. Conclusion: Corneal trauma is a real public health problem. They are especially frequent in young active subjects. Prevention remains the most effective means of treatment.

关键词： Cornéa Trauma CADES/O

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Experimental Study of a Quadratic Boost: The Cascaded Connected Single Switch

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Smart Grid and Renewable Energy 2024年第6期15卷 139-148页

作者： Prince abdoul aziz Honadia Bernard Zouma Adama Ouédraogo Fabé Idrissa Barro Department of Physics and Chemistry Centre Universitaire de Kaya (CU-K) Kaya Burkina Faso Thermal Renewable Energies Laboratory Department of Physics Joseph Ki-Zerbo University Ouagadougou Burkina Faso Semiconductors and Solar Energy Laboratory Department of Physics Faculty of Science and Technique Cheikh Anta Diop University Dakar Senegal

The quadratic boost is studied under its real model. The equations, of the continuous conduction mode, descriptive of this model are established. From these equations, the expressions of the voltage gain and the efficiency are extracted. These two quantities are plotted as a function of the duty cycle in order to appreciate them in different operating points of the transistor. The values of the different components have also been extracted for the fabrication of a prototype of the converter. Thanks to a set of experimental measurements at the input as well as at the output of the prototype converter, the voltage gain and the efficiency could also be observed. These were also plotted for different loads to observe converter behavior. The theoretical curves were compared with the experimental curves which allowed to validate the proposed mathematical models on a large range of duty cycles.

关键词： Voltage Gain Factor Conversion Efficiency Duty Cycle Quadratic Boost

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An OWL-Based Mobile GeoBI Context Ontology Enabling Location-Based and Context-Based Reasoning and Supporting Contextual Business Analysis

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International Journal of Geosciences 2015年第1期6卷 88-108页

作者： Belko abdoul aziz Diallo Thierry Badard Frédéric Hubert Sylvie Daniel Centre de Recherche en Géomatique Université Laval Québec City Canada

Mobile professionals need to be assisted with suitable mobile GeoBI (Geospatial Business Intelligence) systems, which are able to capture, organize and structure the user’s reality into a relevant context model and reason on it. GeoBI context modelling and reasoning are still research issues since there is not yet either a model or a relevant taxonomy regarding GeoBI contextual information. To fill this gap, this paper proposes an extended and detailed OWL-based mobile GeoBI context ontology to provide context-aware applications and users with relevant contextual information and context-based reasoning capabilities. Context quality issues are handled an implementation architecture which is provided.

关键词： Mobile Geospatial Business Intelligence (GeoBI) Context Modelling Context Ontology Context Awareness Context Reasoning Location-Based Reasoning

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Thermomechanical Characterization of Laterite Matrix Reinforced with Typha Material for Thermal Insulation in Building

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Materials Sciences and Applications 2024年第10期15卷 450-463页

作者： El Hadji abdoul aziz Cisse Papa Touty Traore Alphousseyni Ghabo Mor Ndiaye Issa Diagne Semiconductor and Solar Energy Laboratory Physics Department Faculty of Science and Technology Cheikh Anta Diop University of Dakar Dakar Senegal

Every person, in every country and on every continent, will be affected in one way or another by climate change. A climate cataclysm is looming on the horizon due to greenhouse gas emissions. This explains a strong demand for air conditioning in the years to come, hence the need for good thermal insulation at a lower cost. However, a policy of prevention, adaptation, and resilience is necessary for the protection of the environment in the future. This work aims to respond to the United Nations SDGs 7, 11 and 13. This paper presents the results of thermomechanical characterizations of the Typha additive (0%, 5%, 10%, 15%, 20%) in laterite matrices. First, we carried out a thermal characterization using the asymmetric hot plane method, which led to thermal conductivity and effusivity in different proportions. Next, mechanical tests were carried out to determine the traction and compression of each material with a matest press. Those which made it possible to obtain results according to the percentage for the thermal tests: a conductivity varying between 0.7178 W/m·K to 0.0597 W/m·K and an effusivity varying between 942.5392 J/m2·K·s1/2 at 287.0855 J/m2·K·s1/2 and for mechanical tests: traction varying between 0.035 MPa to 0.034 MPa and compression varying between 0.1115 MPa to 0.0805 MPa for the different samples. The exploitation of the results allowed us to study the conductivity, effusivity, traction, and compression as a function of their densities.

关键词： Characterization Asymmetrical Hot Plane Conductivity Effusivity Traction Compression Press and Density

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Comparative Study of Available Solar Potential for Six Stations of Sahel

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Smart Grid and Renewable Energy 2023年第8期14卷 153-167页

作者： Serigne abdoul aziz Niang Ahmed Gueye Astou Sarr Dialo Diop Saka Goni Bado Nebon FST Département de Physique Université Cheikh Anta Diop de Dakar Dakar Sénégal Département de Génie Industriel et Maintenance Université Polytechnique de Mongo Mongo Tchad Laboratoire d’Energies Thermiques Renouvelables Université Joseph KI-ZERBO Ouagadougou Ouagadougou Burkina Faso

Sahel is an African area with high solar potential. However, this potential is not uniform across the region. This paper examines the spatial distribution of the available solar potential by using six stations across the Sahel area. This comparative study was based on the analysis of in situ measurements in Dakar in Senegal, Niamey in Niger, Ouagadougou, Gaoua, Dori in Burkina Faso and N’Djamena in Chad. The results showed the presence of a good global solar potential with an average value of about 5.43 kWh/m2/day. The maxima of global potential are noted in the northern part in Niamey with a value of 6.24 kWh/m2/day while the minima are recorded in the south-eastern part in N’Djamena with an irradiation close to 4.71 kWh/m2/day. Then, the monthly evolution of this potential shows similar trends for all stations. Indeed, two maximums are observed during the year in Spring (March) and Autumn (October). However, for most of these stations, the minima of global potential are recorded in Winter (November, February) and during the rainy season (July, October). Moreover, the direct normal potential also shows seasonal trends for the two stations (Dakar, Niamey) where it was measured. The maxima of direct normal irradiation (DNI) are observed between February and May with a value of 5.5 kWh/m2/day in Dakar and in Niamey with a value around 5.32 kWh/m2/day between February and November.

关键词： Solar Potential Pyranometer Sahel Comparative Study Sunlight Analysis

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Characterization and Risk Assessment of the Collapse of the Woody Stand of Ecosystems of the Fathala Forest (Saloum Delta Biosphere Reserve-Senegal)

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American Journal of Plant Sciences 2021年第7期12卷 975-993页

作者： Eric Kaly Oumar Sarr Sékouna Diatta abdoul aziz Diouf Djibril Diouck Daouda Ngom Laboratory of Plant Ecology and Eco-hydrology Department of Plant Biology Cheikh Anta Diop University Dakar Senegal Ecological Monitoring Center for The Management of Natural Resources (CSE) Fann Residence Dakar Senegal National Parks Directorate Ministry of Environment and Sustainable Development Dakar Senegal

The objective of this study is to characterize and assess the risk of collapse of woody plant formations in the Fathala forest. In recent years, this forest has suffered a sharp reduction in its plant cover to the point of compromising the survival of populations of certain animal species such as the Red colobuses. The methods used are respectively constituted by the transect method, the dendrometric statements method and that of establishing the red list of ecosystems of the IUCN. The specific richness comprises 56 species divided into 47 genera and 22 families. The density is higher in the unfenced area (369 ind/ha in clear forest and 53 ind/ha in gallery forest) compared to the fenced area (160 ind/ha in clear forest versus 48 ind/ha in gallery forest). A study of the plant formations shows a strong degradation of the ecosystems passing from a clear and dry Sudanese forest to a wooded savannah. The cover rate in the fenced area is 20% in gallery forests and 25% in clear forests;in the unfenced area, it is 19% and 23% in gallery forests and clear forests, respectively. The application of the IUCN criteria shows an annual rate of collapse is -6 ind/ha in gallery forests and -4 ind/ha in clear forests. The annual rate of cover collapse would be -3.75% and -2.9% for gallery forests and clear forests, respectively. These results classify the forest in the Critically Endangered category. The main factors responsible for this degradation are, among others, anthropogenic actions and climatic pejoration. These results could constitute a basic tool for undertaking an improvement in the management of this forest, which is a living environment for an animal species.

关键词： Plant Formation Woody Stand Assessment Collapse of Density and Cover

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Mineralogical Characterization of Heavy Mineral Concentrates from Senegalese Great Cost by Using Qemscan and SEM

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International Journal of Geosciences 2020年第12期11卷 800-817页

作者： Moumar Dieye Marieke Van Lichtervelde abdoul aziz Ndiaye Mamadou Gueye Simon B. Blancher Earth Science Institute Cheikh Anta Diop Dakar University Dakar Senegal Geosciences Environnement Toulouse UPS CNRS IRD Toulouse France Eramet Ideas Trappes France

The heavy mineral sands of Senegal are exploited to extract titanium oxides and zircon. Mining is carried out first by means of a floating dredge and concentration plant which produces a heavy mineral concentrate (HMC) containing on average 78% titanium oxides, 11% zircon and a set of silicate and alumino-silicate minerals. This heavy mineral concentrate is then treated by gravity, magnetic and electrostatic separation to produce titanium oxide concentrates (ilmenite, leucoxene, rutile) and three varieties of zircon concentrates (Premium zircon, standard zircon and medium grade zircon standard). In this study, we describe the various mineral concentrates in terms of mineralogical assemblages, and textural variability within grains, using Qemscan and Scanning Electron Microscopy. The titanium oxide concentrates are differentiated by their TiO2 content and vary from ilmenite to rutile. The zircon concentrates are characterized by the presence of impurities in the zircons, which consist in numerous inclusions of titanium oxides and silicate minerals. The mineralogical characteristics determined by scanning electron microscopy and by Qemscan showed great variability within the grains themselves. Heavy minerals contain many mineral inclusions and show strong chemical zoning.

关键词： Heavy Mineral Sand Qemscan SEM Origin

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Tuberculosis of the Uterine Cervix: About a Case and Literature Review

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Open Journal of Obstetrics and Gynecology 2016年第12期6卷 734-739页

作者： Bambara Moussa Konségré Valentin Ouattara Adama Diallo abdoul aziz Zampaligré Idrissa Lompo Olga Goumbri Gynécologue Bobo-Dioulasso Burkina Faso

The authors report a case of tuberculosis of the uterine cervix observed at the maternity unit of the Souro Sanon Teaching Hospital (CHUSS) of Bobo-Dioulasso. This is a rare localization of genital tuberculosis and can take the appearance of a cervical cancer. Biopsy with histological study of the lesion confirms the diagnosis. The frequency of this pathology can reach up to 8%. The extension to the endometrium and/or tubes in a young woman may compromise future fertility. Early and well conducted TB treatment allows the ad integrum restitution cervix.

关键词： Tuberculosis Cervical Biopsy Genital Tuberculosis

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Alternative Phenotypic Profile for B-Cell Abnormality in a Case at Zinder National Hospital

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Open Journal of Blood Diseases 2024年第1期14卷 8-16页

作者： Brah Moustapha Maman Amadou Djibrilla-Almoustapha Moustapha Elhadji-Chefou abdoul-aziz Garba Badé Malam-Abdou Department of Medicine Université André Salifou de Zinder Zinder Niger Department of Medicine H&#244pital National de Zinder Zinder Niger Department of Medicine Université Abdou Moumouni de Niamey Niamey Niger Department of Medicine Université Dan Dicko Dan Koulodo de Maradi Maradi Niger

Introduction: Since it is impossible to establish a diagnosis in the presence of hyperlymphocytosis not secondary to lymphocytic hyperactivation, we considered a B-lymphoid hematopathy with a non-specific phenotypic profile. We report one case of this. Observation: This is a forty-eight (48) year old patient with hyperlymphocytosis at 139,000 elements per cubic millimeter, heterogeneous splenomegaly at 25.6 cm in diameter on abdominal ultrasound without detectable deep or peripheral lymphadenopathy. Peripheral blood cytology shows lymphocyte cell proliferation suggestive of the circulating phase of chronic lymphoproliferative B syndrome. The expression profile of cell membrane markers did not allow for the definition of a specific phenotypic profile. Faced with this immunophenotyping result, we considered a B-lymphoid hemopathy with a non-specific phenotypic profile. After three courses, the MINICHOP treatment was used to achieve partial remission with wasting of more than 80% of the evaluable masses. Conclusion: Despite the contribution of immunophenotyping in the diagnosis of lymphoproliferative syndromes, it is possible to consider the diagnosis of a B-lymphoid hemopathy with a phenotypic non-specific profile of CD45+, monotypic kappa, CD19+, FMC7+, CD22+, CD5−, CD79b−, CD23−, CD43−, CD38−, CD200−.

关键词： Hyperlymphocytosis CLL Immunophenotyping MINICHOP

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Influence of Dust Deposition on the Electrical Parameters of Silicon-Based Solar Panels Installed in Senegal (Dakar Region)

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Energy and Power Engineering 2021年第5期13卷 174-189页

作者： Dialo Diop Moulaye Diagne Abel Sambou Pascal Djicoly Bassene Serigne abdoul aziz Niang Astou Sarr Groupe des Laboratoires de Physique des Solides des Sciences des Matériaux (GLPSSM) Département de Physique Faculté des Sciences et Techniques (FST) Université Cheikh Anta Diop Dakar Sénégal Laboratory of Semiconductor and Solar Energy Department of Physics Faculty of Science and Techniques University Cheikh Anta Diop Dakar Senegal

In recent years, photovoltaic (PV) modules are widely used in many applications around the world. However, this renewable energy is plagued by dust, airborne particles, humidity, and high ambient temperatures. This paper studies the effect of dust soiling on silicon-based photovoltaic panel performance in a mini-solar power plant located in Dakar (Senegal, 14°42'N latitude, 17°28'W longitude). Results of the current-voltage (I - V) characteristics of photovoltaic panels tested under real conditions. We modeled a silicon-based PV cell in a dusty environment as a stack of thin layers of dust, glass and silicon. The silicon layer is modeled as a P-N junction. The study performed under standard laboratory conditions with input data of irradiation at 1000 W/m2, cell temperature at 25°C and solar spectrum with Air Mass (AM) at 1.5 for the monocrystalline silicon PV cell (m-Si). The analysis with an ellipsometer of dust samples collected on photovoltaic panels allowed to obtain the refraction indices (real and imaginary) of these particles which will complete the input parameters of the model. Results show that for a photon flux arriving on dust layer of 70 μm (corresponding to dust deposit of 3.3 g/m2) deposited on silicon-based PV cells, short circuit current decreases from 54 mA (for a cle

关键词： Dust Deposition PV Cell Fill Factor Modeling Ellipsometer

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