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Sleep Disorders among Professional Oil Tanker Drivers in ouagadougou Burkina Faso

Occupational Diseases and Environmental Medicine 2024年第1期12卷 1-20页

作者： guy alain ouédraogo Dofinihanou Dite Inessa Coulibaly Mênonli Adjobimey Abdoul Risgou ouédraogo Rose Mikponhoue Antoine Vikkey Hinson Health Sciences Training and Research Unit University of Ouahigouya Ouagadougou Burkina Faso Department of Pneumology Regional University Hospital of Ouahigouya Ouagadougou Burkina Faso Workers Health Office Ouagadougou Burkina Faso Occupational and Environmental Health Research Unit Faculty of Health Sciences Cotonou Republic of Benin Health Sciences Training and Research Unit Université Joseph Ki-Zerbo Ouagadougou Burkina Faso

Introduction: Sleep disorders among professional drivers are a major road safety problem. They cause fatigue and drowsiness at the wheel, which can lead to road traffic accidents and even accidents at work. The aim of this study was to assess sleep disorders among professional drivers of oil tankers in ouagadougou, Burkina Faso. Methods: This was a descriptive and analytical cross-sectional study carried out from 11 April 2020 to 11 September 2020 in the national hydrocarbon company’s fuel depot. All the drivers present at the time were included and accomplished a questionnaire incorporating the commonly scales using to assess sleep disorders, sleep quality and sleep apnoea. Data analysis using R 3.6.1 software enabled to perform univariate and multivariate analyses to identify associated factors. Adjusted odd ratios were used to measure the strength of association. The significance level chosen was p ≤ 0.05. Results: All the 339 respondents were male. A proportion of 33.6% suffered from insomnia, including 12.7% with moderate to severe insomnia, and 18.58% were at risk of sleep apnoea. On the Epworth scale, 26.6% of drivers showed sleep debt and 4.1% excessive daytime sleepiness. The risk factors associated with insomnia were the use of psychostimulants. A history of diabetes and insomnia were risk factors associated with sleep apnoea syndrome. Conclusion: The prevalence of sleep disturbance and insomnia among the respondents were 52.2% and 33.6% respectively. Use of psychostimulants was the identified risk factor. The prevalence of SAS was 4.72%, with diabetes and insomnia as associated factors.

关键词： Sleep Disorders Sleep Apnoea Occupational Health Burkina

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Design Optimization of a Lattice Tower: Structure and Foundations

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Open Journal of Applied Sciences 2024年第2期14卷 483-493页

作者： Cossi Télesphore Nounangnonhou guy Clarence Semassou Kossoun alain Tossa Noémie Sintondji Laboratory of Energetics and Applied Mechanics (LEMA) University of Abomey-Calavi Abomey-Calavi Benin Laboratory of Electrotechnics Telecommunications and Applied Informatics (LETIA) University of Abomey-Calavi Abomey-Calavi Bénin

Produced in power plants, electrical energy is transported to places of consumption via the electricity network. At the heart of this network are the supports that allow electricity to be efficiently transported over long distances, guaranteeing the security and supply of energy to the various centers of use. In the construction of a line, supports occupy an important part in terms of safety and construction cost. It is therefore essential to optimize their use to reduce the cost of transmission lines. This work addresses this problem, which focuses on the optimal utilization of X-lattice towers in the construction of overhead power lines. The challenge is to reconcile the search for optimal cost and respect for the design, resistance and service constraints of the structure. To do this, a parameter having a strong correlation with the weight, foundation and construction cost of the X-lattice tower for 161 kV lines is determined as an important cost variable. This parameter is the wheelbase of the towers. The junction point between the structure and the foundations is obtained by measuring the forces at the base of the tower following the lowering of the loads. These efforts make it possible to size foundations which are of the inverted or isolated sole type. The results obtained reveal that from 8 meters in width, the wheelbase gradually changes until the optimum is obtained at 6.29 meters. With this wheelbase, the production cost is optimal. It clearly emerges from this study that the construction of lattice pylons with a wheelbase of approximately 6.29 meters makes it possible to optimize the cost of construction of 161 kV lines in the Republic of Benin.

关键词： Lattice Tower Wheelbase Cost Optimization Foundation

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Evaluation of a Rapid Diagnostic Test, Boson Biotech SARS CoV-2 Ag, for the Detection of SARS-CoV-2 in Gabon

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Advances in Infectious Diseases 2024年第2期14卷 469-477页

作者： Samira Zoa Assoumou Ulrich Leger Davy Mouangala Ludovic Mewono Davy-Christ Angoune Ndong guy Paterne Malonga Mbembo Nely Meungang alain Moutsinga Elvyre Anita Mbongo Kama Rodrigue Mintsa Nguema Dpartement de Bactriologie-Virologie Universit des Sciences de la Sant Libreville Gabon Laboratoire Professeur Daniel Gahouma Libreville Gabon Departement des Sciences de la vie et de la Terre Ecole Normale Suprieure Libreville Gabon Centre de sant de Glass Libreville Gabon Laboratoire National de Sant Publique Libreville Gabon Dpartement de Biologie et Ecologie Animale Centre National de la Recherche Scientifique et Technologique Libreville Gabon Laboratoire dEcologie des Maladies Transmissibles (LEMAT) Universit Libreville Nord (ULN) Libreville Gabon

1) Background: Rapid and acurate diagnostic testing for case identification, quarantine, and contact tracing is essential for managing the COVID 19 pandemic. Rapid antigen detection tests are available, however, it is important to evaluate their performances before use. We tested a rapid antigen detection of SARS-CoV-2, based on the immunochromatography (Boson Biotech SARS-CoV-2 Ag Test (Xiamen Boson Biotech Co., Ltd., China)) and the results were compared with the real time reverse transcriptase-Polymerase chain reaction (RT-PCR) (Gold standard) results;2) Methods: From November 2021 to December 2021, samples were collected from symptomatic patients and asymptomatic individuals referred for testing in a hospital during the second pandemic wave in Gabon. All these participants attending “CTA Angondjé”, a field hospital set up as part of the management of COVID-19 in Gabon. Two nasopharyngeal swabs were collected in all the patients, one for Ag test and the other for RT-PCR;3) Results: A total of 300 samples were collected from 189 symptomatic and 111 asymptomatic individuals. The sensitivity and specificity of the antigen test were 82.5% [95%CI 73.8 - 89.3] and 97.9 % [95%CI 92.2 - 98.2] respectively, and the diagnostic accuracy was 84.4% (95% CI: 79.8 - 88.3%). The antigen test was more likely to be positive for samples with RT-PCR Ct values ≤ 32, with a sensitivity of 89.8%;4) Conclusions: The Boson Biotech SARS-CoV-2 Ag Test has good sensitivity and can detect SARS-CoV-2 infection, especially among symptomatic individuals with low viral load. This test could be incorporated into efficient testing algorithms as an alternative to PCR to decrease diagnostic delays and curb viral transmission.

关键词： SARS-CoV-2 Rapid Diagnostic Test Evaluation COVID-19 Antigen Performance

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High Performance for Cu(In,Ga)Se₂ Quaternary System-Based Solar Cells with Alternative Buffer Layers

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Advances in Materials Physics and Chemistry 2022年第9期12卷 207-219页

作者： Daouda oubda Marcel Bawindsom Kébré Soumaïla ouédraogo alain Diasso François Zougmoré Zacharie Koalga Frédéric ouattara Laboratoire de Matériaux et Environnement (LA.M.E)-UFR/SEA Université Joseph KI-ZERBO Ouagadougou Burkina Faso Laboratoire de Recherche en Energétique et Météorologie de l’Espace (LA.R.E.M.E) Université Norbert Zongo Koudougou Burkina Faso

In this study, the authors investigated the performance of different buffer layers through the electrical parameters such as Jsc, Voc, QE and η of the quaternary system Cu(In,Ga)Se2 solar cells. The performance of Cu(In,Ga)Se2solar cells has been modeled and numerically simulated by using the SCAPS- 1D device simulation tool. The cells with a ZnSe, Zn(O,S) and (Zn,Mg)O buffer layers were compared with the reference CdS buffer layer. The investigation of ZnSe, Zn(O, S) and (Zn,Mg)O-based cells to substitute the traditional CdS in the future shows that the ZnSe-buffer layer is a potential material to replace CdS, which revealed the best efficiency of 20.76%, the other electrical parameters are: JSC = 34.6 mA/cm2, VOC = 0.76 V and FF = 79.6%. The losses as a function of the temperature are estimated at 0.1%/K, among all kinds of buffer layers studied. We have also shown that the use of a high band-gap buffer layer is necessary to obtain a better short-circuit current density JSC. From our results, we note that the chalcogenide solar cells with Zn-based alternative buffer layer have almost the same stability thatthe traditional CdS buffer layer solar cells have.

关键词： Thin Film Solar Cells CIGS Absorber Alternative Buffer Layers SCAPS-1D Electrical Parameters

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Renewable Energies in Africa, Context and Socio-Economic Challenge

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Open Journal of Applied Sciences 2022年第11期12卷 1856-1872页

作者： Daouda oubda Soumaïla ouédraogo alain Diasso Marcel Bawindsom Kébré François Zougmoré Zacharie Koalga Frédéric ouattara LA.M.E (Laboratoire de Matériaux et Environnement) UFR-SEA (Unité de Formation et de Recherche en Sciences Exactes et Appliquées) Ecole Doctorale Sciences et Technologies Université Joseph KI-ZERBO Ouagadougou Burkina Faso LA.R.E.M.E (Laboratoire de Recherche en Energétique et Météorologie de l’Espace) Université Norbert Zongo Koudougou Burkina Faso

In this paper, we have shown that Africa has an enormous wealth of renewable energy resources among the most important in the world such as the strong sunshine, Congo and Nile Rivers respectively among the most powerful and the longest in the world. We have underlined the presence of important forests, rich subsoil in mineral elements, and strong winds. In addition to a rapidly growing human capital, Africa, therefore, has at its disposal all the factors enabling it to initiate sustainable and inclusive socio-economic development. We have shown that the transformation of these renewable energies is an opportunity for Africa to reach its socio-economic challenges. The development of renewable energies in Africa will be a source of many financial benefits and advantages both in terms of improving living conditions and carrying out activities. The electrical supply of rural areas of Africa represents a considerable issue, which can be a propellant factor in long-term socio-economic development if the conditions of use of clean fuel and cooking technologies, especially sanitary are taken into account. The provision of modern energy services can contribute to the creation of jobs for young people upstream. Among other things, we can note the development of local skills, the creation of income-generating activities, and the improvement of hygiene and health measures which are necessary conditions for family and social well-being. This requires a policy focused, on research in general and in particular on semiconductors that participate in the transformation of photovoltaic solar energy. We have stressed that Africa which is currently experiencing a period of economic growth and sustained transformation must be very looking at in its energy policy and give pride of place to renewable energies to initiate sustainable socio-economic development, equitable and inclusive different social strata both in rural areas and urban areas.

关键词： Africa Renewable Energy Photovoltaic Solar Energy Semiconductor Socio-Economic Urban Area Rural Area

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Polysaccharide-based chromatographic adsorbents for virus purification and viral clearance

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Journal of Pharmaceutical Analysis 2020年第4期10卷 291-312页

作者： guy-alain Junter Laurent Lebrun Normandie Univ UNIROUENINSA RouenCNRSPBS76000RouenFrance

Viruses still pose a significant threat to human and animal health *** the fight against viral infections,high-purity viral stocks are needed for manufacture of safer *** is also a priority to ensure the viral safety of biopharmaceuticals such as blood *** techniques are widely implemented at both academic and industrial levels in the purification of viral particles,whole viruses and virus-like particles to remove viral contaminants from biopharmaceutical *** paper focuses on polysaccharide adsorbents,particulate resins and membrane adsorbers,used in virus purification/removal chromatography *** chromatographic modes are surveyed,with particular attention to ion exchange and affinity/pseudo-affinity adsorbents among which commercially available agarose-based resins(Sepharose®)and cellulose-based membrane adsorbers(Sartobind®)occupy a dominant *** built on the development of new ligands coupled to conventional agarose/cellulose matrices,the development perspectives of polysaccharide-based chromatography media in this antiviral area are stressed in the conclusive part.

关键词： Polysaccharide Chromatography Virus particle Biopharmaceuticals purification Vaccine

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2D Modeling of Solar Cell Radial Junction: Study of Carriers Charge Density and Photocurrent Density in Static Mode under Monochromatic Illumination

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Energy and Power Engineering 2020年第10期12卷 568-577页

作者： Moussa ouédraogo Raguilignaba Sam alain Diasso Bernard Zouma François Zougmoré Laboratoire de Maté riaux d’H&eacute liophysique et Environnement (LaMHE) D&eacute partement de Physique UFR/ST Universit&eacute Nazi Boni Bobo Dioulasso Burkina Faso Laboratoire de Maté riaux et Environnement D&eacute partement de Physique UFR/SEA Universit&eacute Joseph Ki-Zerbo Ouagadougou Burkina Faso Laboratoire d’Energies Thermique Renouvelables (L.E.T.R.E) Universit&eacute Joseph Ki-Zerbo Ouagadougou Burkina Faso

A theoretical study of a polysilicon solar cell with a radial junction in static regime under monochromatic illumination is presented in this paper. The junction radial solar cell geometry is illustrated and described. The carriers’ diffusion equation is established and solved under quasi-neutral base assumption with boundaries conditions and Bessel equations. New analytical expressions of electrons and holes density and photocurrent are found. The wavelength and structural parameters (base radius, emitter thickness) influences on charge carriers density and photocurrent are shown and examined.

关键词： Electrons Density Holes Density Holes Photocurrent Radial Junction

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Effect of phosphatation and calcination on the environmental behaviour of sediments

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International Journal of Sediment Research 2019年第5期34卷 486-495页

作者： Moussa Dia Rachid Zentar Nor-edine Abriak Ange Nzihou guy Depelsenaire alain Germeau Department of Civil & Environmental Engineering Toulouse University Mines Albi CNRS RAPSODEE Center Campus Jarlard SOLVAY SA DCRT 4. PRAYON SA

Dredging operations produce considerable quantities of materials, to be managed and this opens an opportunity for valorization in civil engineering. However, the contamination of the dredged sediment has become a major problem to solve. The major contaminants are heavy metals and organic compounds This study focuses on the use of phosphoric acid(H3 PO4) to stabilize heavy metals from sediments an destroy organic matter by calcination at 650 °C with a goal of using sediments in roadworks. Severa studies have been conducted in this field. The stabilized materials obtained have been used in civ engineering. The main purpose of this work is to discuss the environmental behavior of marine sedimen treated by phosphatation and calcination. Two types of phosphoric acids were used. The p H dependenc leaching test has been used as the basic characterization to evaluate the effect of the type of phosphori acid on the metals behavior in a valorization scenario. The standard leaching test and the Toxicit Characteristic Leaching Procedure(TCLP) were conducted as compliance tests. In regards of the obtaine results, the environmental assessment has also shown a reduction in the availability of targeted heav metals in alkaline environment whatever the type of acid used for treatment. This opens opportunitie for co-valorization.

关键词： Polluted sediments Heavy metals Phosphatation Calcination and environmental behaviour

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Level of Contamination of Fishponds Water in Pesticide Residues and Metallic Trace Elements (Pb, Cd, As, Hg): Case of Fishponds of ZEPREGUHE (Daloa, Côte d’Ivoire)

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Journal of Agricultural Chemistry and Environment 2022年第4期11卷 307-317页

作者： Kacou alain Paterne Dalogo Ano guy Serge Ehouman James Halbin Kouadio David Leonce Kouadio Edi Jean Frejus Ehui Karim Sory Traore Laboratory of Environmental Sciences and Technology Jean Lorougnon GUEDE University Daloa C&ocirc te d’Ivoire Laboratory of Environmental Sciences Nangui Abrogoua University Abidjan C&ocirc te d’Ivoire Agroforestry Training and Research Unit Biochemistry-microbiology Department Agrovalorisation Laboratory Jean Lorougnon GUEDE University Daloa C&ocirc te d’Ivoire

Fishponds waters intended to satisfy the nutritional needs of the populations in terms of supply of fish resources are strongly and unfortunately exposed to the mobility and dispersion of metallic trace elements (TMEs) or to the persistence in the environment and in the form of pesticide residues from human activities. The objective of this work is to evaluate, on the one hand, the levels of identified pesticide residues and, on the other hand, those of researched TMEs (lead, cadmium, mercury and arsenic) in the waters of ponds used for fish farming in Zépréguhé, a locality located 9 km from the town of Daloa in the centre-west of Côte d’Ivoire. The dosage of the samples carried out by means of a gas chromatograph coupled to a mass spectrometer (GC/MS) made it possible to detect nine (9) pesticide molecules, including eight (8) organochlorines and a single molecule from the pyrethroid family, obtained from the detection limit of 0.006 μg/L and the quantification limit of 0.018 μg/L. The maximum average concentration was obtained with α-endosulfan for a content reaching 0.8038 μg/L and well above the maximum admissible concentration of 0.1 μg/L. The TMEs were quantified using an atomic absorption spectrophotometer (AAS). Arsenic is the most abundant metal with an average concentration of 9.497 μg/L. With the exception of lead, these measured levels are above the acceptable limit values for freshwater. This study showed that human activities such as the use of fertilisers and plant protection products in plantations, sand extraction and road traffic have a negative impact on the quality of the water in ponds used for fish breeding.

关键词： Fishpond Water Metallic Trace Elements Pesticide Residues Maximum Residue Levels

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Ankylosing Spondylitis in Sub-Saharan Africa: A Series of 48 Cases Reported in Burkina Faso (West Africa)

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Open Journal of Rheumatology and Autoimmune Diseases 2018年第3期8卷 87-92页

作者： Wendlassida Joelle Zabsonre Tiendrebeogo Serge Aime Sawadogo Fulgence Kabore alain Ilboudo Charles Sougue Enselme Zongo Camille Sompougdou Moussa ouédraogo Evariste Tiendrebeogo Dieu-Donne ouedraogo Rheumatology Department Bogodogo District Hospital Ouagadougou Burkina Faso Université ouaga I Pr Joseph Ki-Zerbo Ouagadougou Burkina Faso Department of Basic and Mixed Sciences Université Ouaga I Pr Joseph Ki-Zerbo Ouagadougou Burkina Faso

Background: Ankylosing spondylitis is rare in sub-Saharan Africa. The purpose of our study was to report cases of AS in a black African population and to see the influence of gender. Method: It was a retrospective study conducted in the Rheumatology Department of ouagadougou University Hospital, ouagadougou, from March 2006 to February 28, 2015 for a period of nine years. All the patients who went under a rheumatology consultation during the study period were included. Patients with AS defined by the modified New York criteria were selected. Result: Forty-eight (0.61%) cases of AS were diagnosed among 7806 patients received in the rheumatology department during the study period. The search for the HLA B27 antigen in 20 patients was positive in 11 (55%). Half of the patients (50%) had a BASDAI score ≥ 4. Sacroiliitis was observed in all patients;it was stage 4 in 8 patients. Comparing by sex, there was no statistically significant difference by gender. Conclusion: Prevalence of ankylosing spondylitis increases. The presentation is similar to that of the caucasian series.

关键词： Ankylosing Spondylitis Black African Gender

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