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Consideration of Size and Dimension in the Evaluation of Transfers during Convective Drying of Sweet Potato

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Journal of Analytical Sciences, Methods and Instrumentation 2020年第4期10卷 104-112页

作者： Abdou-Salam Ganame Kondia Honore Ouoba françois zougmore Laboratoire des Matériaux et Environnement (LAME) Unité de Formation et de Recherche en Sciences Exactes et Appliquée (UFR/SEA) Université de Ouaga I Ouagadougou Burkina Faso

This work is interested in solving the complex problem of understanding mass transfers in biological media. The contribution of the initial sample size is taken into account. Transfers are established more efficiently in small samples. Thus, from the first 50 minutes, the cubic sample at 1 cm stop is already at 50% while the sample at 4 cm edge is at about 90% of its initial water content. Likewise the shape is combined with the size. But it is revealed that if we fix similar characteristic dimensions, we can bypass the notion of initial shape. Thus the cubic samples 4 cm of edges. 4 cm diameter of spherical shape, 4 cm × 4 cm height-diameter cylindrical one, all dry identically.

关键词： Mass Transfer Size Shape Agri-Food Products

Research of the Characteristic Dimension of the Transfers during the Convective Drying of the Sweet Potato for the Parallelepipedic and Spherical Shapes

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Advances in Materials Physics and Chemistry 2021年第12期11卷 267-276页

作者： Kondia Honoré Ouoba Abdou-Salam Ganame françois zougmore Laboratoire des matériaux et Environnement (LA.M.E.) Unité de Formation et de Recherche en Sciences Exactes et Appliquée (UFR/SEA) Université de Ouaga I Ouagadougou Burkina Faso

The aim of this work was to determine the characteristic dimension governing transfers during convective drying. Parallelepipedic and cylindrical form of sweet potato was used. For the parallelepipedic form P_L-l-e, the thickness e is set to 1 cm while the length L and the width l are varying. The results show that the variation of the other dimensions other than the thickness e does not influence the transfers in a considerable way. The same observation is made for the cylindrical samples c_H-R by keeping the radius R constant. This present work therefore allows us to conclude that the thickness of the parallelepiped shaped samples and the radius of the cylindrical shapes, all being the smallest dimensions, characterize the transfers.

关键词： Drying Initial Size Characteristic Dimension Forms

Assessing Water Resources Access of Nouhao Sub-Basin, Burkina Faso

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Journal of Water Resource and Protection 2023年第4期15卷 149-164页

作者： Wendkuni Ghislain Noba Lucien Damiba Ali Doumounia Inoussa Zongo françois zougmore Department of Physics Laboratory of Materials and Environment (LA.M.E) Joseph Ki-Zerbo University Ouagadougou Burkina Faso WaterAid International Program Department Research and Knowledge Management in West Africa Ouagadougou Burkina Faso Institute of Sciences (IDS) Ouagadougou Burkina Faso National Center of Scientific and Technological Research Ouagadougou Burkina Faso

Water resource access in the Nouhao sub-basin, assessed based on the availability of drinking water mobilization facilities, the availability of water for uses and the quality of drinking water, revealed that in 2017 the basin was covered by 1249 modern water point, main drinking water sources. On average, the sub-basin shows a ratio of 271 users per drinking water point. Communal level shows some disparity with Bittou recording the highest number of people per drinking water point, i.e., around 537. Water that can be captured in the entire sub-basin meets only 42% of the total water needs from the three mains uses: irrigation, domestic consumption and livestock. The highest demander among these uses is Irrigation with 75% of the need, i.e., approximately 12,859,995 m3. Water in 33% drinking sources of this sub basin is of poor quality. Arsenic, one of the quality parameters studied, is found in some communes of the sub-basin. 11% of the water points in Bissiga are arsenic polluted making this commune the most arsenic contaminated location. The vulnerability maps deducted from lack of water for uses;lack of drinking water works and poor water quality shows so, the exposure level of the sub-basin’ communes to some potential risks related to low water resources access.

关键词： Water Resources Nouhao Sub-Basin Access to Water Modern Water Points Vulnerability

Evaluation of the Performance of Lithium-Ion Accumulators for Photovoltaic Energy Storage

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Energy and Power Engineering 2023年第12期15卷 517-526页

作者： Toussaint Tilado Guingane Dominique Bonkoungou Eric Korsaga Dieudonné Simpore Soumaila Ouedraogo Zacharie Koalaga françois zougmore Laboratoire des Matériaux et Environnement (LA.M.E.) Unité de Formation et de Recherche en Sciences Exactes et Appliquée (UFR/SEA) Université Joseph KI-ZERBO Ouagadougou Burkina Faso Laboratoire de Sciences et Technologies (LaST) Unité de Formation et de Recherche en Sciences et Techniques (UFR/ST) Université Thomas SANKARA Ouagadougou Burkina Faso

In a context of climate change exacerbated by the increasing scarcity of fossil fuels, renewable energies, in particular photovoltaic solar energy, offer a promising alternative. Solar energy is non-polluting, globally available and the most widely distributed resource on Earth. However, the intermittency of this energy source considerably limits its expansion. To solve this problem, storage techniques are being used, in particular, electrochemical storage using lithium-ion batteries. In this article, we will evaluate the performance of lithium-ion batteries when integrated into a photovoltaic grid. To do this, modelling and simulation of a photovoltaic system connected to a lithium-ion battery storage system will be carried out using MATLAB/Simulink software. A diagnostic of the energy consumption of the Kaya Polytechnic University Centre will be carried out, and the data will then be used in the simulator to observe the behaviour of the PV-Lion system. The results obtained indicate that lithium-ion batteries can effectively meet the centre’s energy demand. In addition, it was observed that lithium-ion batteries perform better under high energy demand than the other battery technologies studied. Successive storage systems with the same capacity but different battery technologies were compared. It was found that these storage systems can handle a maximum power of 4 × 105 W for lead-acid batteries, 6.5 × 105 W for nickel-cadmium batteries, 8.5 × 105 W for nickel-metal-hydride batteries, and more than 10 × 105 W for lithium-ion technology.

关键词： Photovoltaic Energy Energy Storage Lithium-Ion Accumulator Modeling MATLAB/Simulink Simulation

Assessment of Radon Concentrations inside Residential Buildings and Estimation of the Dose in the City of Kaya, Burkina Faso

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Open Journal of Applied Sciences 2023年第7期13卷 1066-1078页

作者： Wend-Yam Appolinaire Elola Telado Luc Bambara Ali Doumounia Nièssan Kohio Soumaila Ouédraogo françois zougmore Laboratoire de matériaux et Environnement Université Joseph Ki-Zerbo Burkina Faso Institut des Sciences et de Technologie Ecole Normale Supérieure Burkina Faso

Colorless, incessant radon gas is notably the second most important cause of lung cancer after smoking in smokers and the first cause in non-smokers. Having little effect in the atmosphere, radon gas accumulates in confined spaces. Therefore, the determination of radon concentrations inside residential buildings is very important to improve the health of the inhabitants. The objective of this research is to measure the concentration of radon in indoor air in residential areas of the city of Kaya and to assess the absorbed dose, the effective dose and the relative risk of lung cancer. In this study, the CORENTIUM AIR THINGS digital radon detector is used to determine the radon concentration in twenty-one houses in Kaya. The CORENTIUM AIR THINGS digital radon detector has been placed in each residential building for a minimum period of one week and the concentration values are read every 24 hours. This research revealed that the average concentration of radon was 28.47 Bq/m3 in the residential areas of Kaya. The radon concentration in a house has been found to exceed 100 Bq/m3, which is the level authorized by the World Health Organization (WHO). In the long term, the absorbed dose varies from 0.118 mSv to 4.975 mSv and the effective dose is between 0.229 mSv and 12.002 mSv. In the short term, the absorbed dose varies between 0.095 mSv to 5.001 mSv and the effective dose is between 0.283 mSv to 11.935 mSv. The mean lung cancer relative risk (CPRR) from indoor exposure was 1.026. There is a need to raise awareness among the population of the city of Kaya on this issue and to take measures to reduce radon in homes when the concentrations are above the limit recommended by the WHO.

关键词： Radon Concentration Dose Relative Risk Lung Cancer

Evaluation of Radon Concentration and the Health Risk in the Offices of the Institute of Science and Technology of the “École Normale Supérieure”, Burkina Faso

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World Journal of Nuclear Science and Technology 2023年第3期13卷 41-54页

作者： Rouamba M. M. Jonathan Bambara Telado Luc Doumounia Ali Kohio Nièssan Ouédraogo Soumaila françois zougmore Laboratory of Materials and Environment Physics Department University Joseph Ki-Zerbo Ouagadougou Burkina Faso Institute of Science and Technology Ecole Normale Supérieure Koudougou Burkina Faso

The second most important cause of lung cancer after smoking is radon gas. Thus, the determination of indoor radon concentrations in residential buildings and workplaces is an important public health concern. The purpose of this research was to measure the concentration of radon gas in the offices of the Institute of Science and Technology and to evaluate the effective dose in the lungs and the risk of cancer. This study used Corentium’s AIR THINGS digital radon detector to determine the radon concentration in sixteen (16) offices. The digital radon detector air Things of Corentium was placed in each office for a minimum period of one week and the concentration values were recorded every 24 hours. The values recorded in each office were the short-term average and the long-term average during seven days of measurement. The short-term radon concentrations vary between 5.286 Bq/m3 and 192.714 Bq/m3 with an average of 48.01 Bq/m3 and those in the long-term were between 6.143 Bq/m3 and 172.571 Bq/m3 with an average of 52.46 Bq/m3. The measurements in office N°6 and 13 were above the lower limit of 100 Bq/m3 proposed by the WHO. The short-term and long-term effective doses in the lungs for offices N°6 and 13 were above the “normal” background level of 1.1 mSv/year proposed by UNSCEAR-2000. The short-term effective dose in the lungs for office N°6 was above the lower limit of 3 mSv per the ICRP-23 recommendation. The average number of lung cancer cases per year per million people was 15.

关键词： Radon Concentration Absorbed Dose Effective Dose

Application of Machine Learning Methods on Climate Data and Commercial Microwave Link Attenuations for Estimating Meteorological Visibility in Dusty Condition

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Engineering（科研） 2022年第2期14卷 85-93页

作者： Wend Yam Serge Boris Ouedraogo Sibiri Tiemounou Moumouni Djibo Ali Doumounia Serge Roland Sanou Moumouni Sawadogo Idrissa Guira françois zougmore Laboratoire Matériaux et Environnement Université Joseph KI-ZERBO Ouagadougou Burkina Faso Institut du Génie Informatique et Télécommunications Ecole Polytechnique de Ouagadougou Ouagadougou Burkina Faso Ecole Normale Supérieure Koudougou Burkina Faso Autorité de Régulation des Communications électroniques et des Postes Ouagadougou Burkina Faso Telecel Faso SA Ouagadougou Burkina Faso

Accurately measuring meteorological visibility is an important factor in road, sea, rail, and air transportation safety, especially under visibility-reducing weather events. This paper deals with the application of Machine Learning methods to estimate meteorological visibility in dusty conditions, from the power levels of commercial microwave links and weather data including temperature, dew point, wind speed, wind direction, and atmospheric pressure. Three well-known Machine Learning methods are investigated: Decision Trees, Random Forest, and Support Vector Machines. The correlation coefficient and the mean square error, between the visibility distances estimated by Machine Learning methods and those provided by Burkina Faso weather services are computed. Except for the SVM method, all the other methods give a correlation coefficient greater than 0.90. The Random Forest method presents the best result both in terms of correlation coefficient (0.97) and means square error (0.60). For this last method, the best variables that explain the model are selected by evaluating the weight of each variable in the model. The best performance is obtained by considering the attenuation of the microwave signal and the dew point.

关键词： Meteorological Visibility Commercial Microwave Link Machine Learning Climate Parameters Dust Attenuation

Taking into Account the Complex Nature and the Intrinsic Parameters of Agro-Food

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Journal of Biophysical Chemistry 2020年第1期11卷 1-13页

作者： Ganame Abdou-Salam Ouoba Kondia Honore zougmore fran?ois Laboratoire des matériaux et Environnement(LA.M.E.) Unitéde Formation et de Recherche en Sciences Exactes et Appliquée(UFR/SEA)Universitéde Ouaga IJoseph KI-ZERBOOuagadougouBurkina Faso

In this paper, we perform experiments on the drying of widely consumed food products in Africa. Tomatoes and peppers are considered as products with a complex structure. Zucchini, cucumber, eggplant and cabbages are the other products used in these drying experiments, having different intrinsic parameters. Most food products have three components, namely skin, flesh containing seeds and the central spongy structure, that do not have the same behavior during their convective drying. Skin is the component that significantly reduces drying while the flesh is easy to dry. By drying the samples considering their intrinsic parameters, one quickly realizes the complex nature of mass and heat transfers during the drying of biological products.

关键词： Skin Flesh Structure Convective Drying Agri-Food Products

Study of the Composition of a Plasma of Dry Air Contaminated by Al₂O₃, CO, Fe₂O₃ and SiO₂

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Advances in Materials Physics and Chemistry 2022年第8期12卷 177-193页

作者： Yaguibou W. Charles Korsaga Eric Korbeogo Aly Rachid Koalaga Zacharie zougmore françois LAME Université Joseph Ki-Zerbo Ouagadougou Burkina Faso Centre universitaire de Dori Université Thomas Sankara Ouagadougou Burkina Faso Ecole Polytechnique de Ouagadougou Ouagadougou Burkina Faso

This paper concerns the calculation of equilibrium composition of plasma mixture Air Fe2O3, SiO2, Al2O3 and CO in temperatures range 1000 K to 6000 K. We supposed that the plasma is at atmospheric pressure and at local thermodynamic equilibrium (ETL). In the Saharan zone, the aerosols are proven from desert dust and biomass fires. They are essentially composed of oxides of silicon, calcium, iron, aluminum and carbonaceous elements from biomass. Thus, air circuit breakers often operate in a polluted environment without specific protection. They can have abnormal behaviors and failures of cuts. We used Gibbs free energy minimization method to access the different numerical densities of chemical species as a function of temperature. These data are very important to calculate thermodynamic properties, transport coefficients and modeling electrical arc in circuit breakers. The results show that the dust brings many particles which have low dissociation and ionization energies. This leads to an increase in metallic elements and a strong increase in the numerical density of electrons which could have a detrimental effect during the current cut-off phase with the increase in the electrical conductivity of the plasma.

关键词： Plasma Aerosol Equilibrium Composition Gibbs Free Energy Arc Circuit Breaker