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Pest Management of Storage Pests Using Extracts of Afrostyrax lepidophyllus against Sitophilus zeama＇（s, Tribolium castaneum and Rhyzopertha dominica

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Journal of Agricultural Science and Technology(B) 2014年第1期4卷 58-66页

作者： Aba Toumnou Lucie gueye momar talla Bolevane Ouatinam Serge Florent Traore Anna gueye Sabelle Lakouetene Didier Ponel Beranger Namkosserena Salomon Ndoye Ousmane Syssa-Magale Jean-Lauren Noba Kandioura Sembene Mbacke Seck Dogo Faculty of Sciences University of Bangui Bangui Central Africa Republic lnstitut of Food Technology Dakar 3300 Senegal Regional Centre for Ecotoxicology Studies and Chemical Environment Security (CERES-Locustox) Dakar 3300 Senegal Regional Pole of Applied Research to Development Farming Systems in Central Africa (PRASAC) Bangui Central Africa Republic West and Central African Council for Agricultural Research and Development Dakar 18523 Senegal Faculty of Sciences Cheikh Anta Diop University Dakar 5005 Senegal

The use of botanical pesticides in pest management during storage against insects is often encouraged because synthetic insecticides produce multiple side-effects on human health and environment. Insecticidal activity of the hexane, dichloromethane, ethyl acetate and methanol extracts of bark ofAfrostyrax lepidophyllus was tested on Sitophilus zeama~：~, Tribolium castaneum and Rhy-opertha dominica. The mortality rate was measured variable. The results of analysis showed that the mortality rate has a very highly significant variation following extracts, doses, insects and time considered （P 〈 0.001）. Extracts with ethyl acetate and hexane of A. lepidophyllus are effective against S. zeamais at the highest doses （1 g/10 mL and 0.5 g/10 mL of solvent）. These effective extracts werc characterized by gas chromatography coupled with mass spectrometry. Molecules such as thiocyanic acid, ethyl ester： dimetbylditbiophosphinic acid and other were characterizated. These results may consolidate traditional use ofA. lepidophylh^s in pest management.

关键词： Control stored grains pests management Afrostyrax lepidophyllus.

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Chemical Characterization and Insecticidal Activity of Ethyl Acetate and Dichloromethane Extracts of Drypetes gossweileri against Sitophilus zeamais, Tribolium castaneum and Rhyzopertha dominica

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Journal of Life Sciences 2013年第10期7卷 1030-1040页

作者： Aba Toumnou Lucie Seck Dogo Lakouetene Didier Ponel Beranger Bolevane Ouantinam Serge Florent gueye momar talla Traore Anna Namkosserena Salomon Noba Kandioura Sembene Mbacke Syssa-Magale Jean-Laurent Regional Centre for Studies on the Improvement of Plant Adaptation to Drought Thies 3320 Senegal Regional Centre for Ecotoxicology Studies and Chemical Environment Security (CERES-Locustox) Dakar 3300 Senegal Department of Natural sciences University of Bangui Bangui 908 Central Africa Republic Institut of Food Technology Dakar 2765 Senegal Regional Pole of Applied Research to Development Farming Systems in Central Africa (PtL4SAC) N 'Djamena 764 Chad Department of Plant Biology Cheikh Anta Diop University Dakar 5005 Senegal Department of Animal Biology Cheikh Anta Diop University Dakar 5005 Senegal

The use of botanical pesticides in pest management during storage against insects is often encouraged because synthetic insecticides produce undesired effects. Bark powder ofDrypetes gossweileri is used by farmers in pest management in Central Africa Republic. Hexane, dichloromethane, ethyl acetate and methanol were used for extraction bark powder by maceration. Insecticidal activity of the extracts was tested on Sitophilus zeamais, Tribolium castaneum and Rhy_-opertha dominica. The mortality rate, the number of surviving insects and the number of emerged insects were measured variables. Calculated mortality was obtained by applying Aboth＇s formula. The variables are submitted to variance analysis, model with four factors （plants, insects, doses and time） in Minitab 14. The results of analysis showed that the mortality rate has a very highly significant variation following extracts, doses, insects and time considered （P 〈 0.001）. Extracts with ethyl acetate and dichloromethane of D. gossweileri are effective against S. zeamais and R. dominica at high doses （1, 0.5, 0.250 g/10 mL of solvent）. These effective extracts were characterized by gas chromatography coupled with mass spectrometry. Molecules such as l-isothiocyanatomethyl, thiocyanic acid, phenylmethyl ester and other were characterizated. These results may consolidate traditional use olD. gossweileri in pest management.

关键词： Control stored grains pests' management Drypetes gossweileri.

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Seasonal Performance of Solar Power Plants in the Sahel Region: A Study in Senegal, West Africa

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Smart Grid and Renewable Energy 2024年第2期15卷 79-97页

作者： Serigne Abdoul Aziz Niang Mamadou Simina Drame Astou Sarr Mame Diarra Toure Ahmed gueye Seydina Oumar Ndiaye Kharouna talla FST D&#233partement de Physique Universit&#233 Cheikh Anta Diop de Dakar Dakar S&#233n&#233gal Laboratoire de Physique de l’Atmosphère et de l’Océan Siméon Fongang Université Cheikh Anta Diop Dakar Sénégal

The main objective of this study is to evaluate the seasonal performance of 20 MW solar power plants in Senegal. The analysis revealed notable seasonal variations in the performance of all stations. The most significant yields are recorded in spring, autumn and winter, with values ranging from 5 to 7.51 kWh/kWp/day for the reference yield and 4.02 to 7.58 kWh/kWp/day for the final yield. These fluctuations are associated with intense solar activity during the dry season and clear skies, indicating peak production. Conversely, minimum values are recorded during the rainy season from June to September, with a final yield of 3.86 kWh/kW/day due to dust, clouds and high temperatures. The performance ratio analysis shows seasonal dynamics throughout the year with rates ranging from 77.40% to 95.79%, reinforcing reliability and optimal utilization of installed capacity. The results of the capacity factor vary significantly, with March, April, May, and sometimes October standing out as periods of optimal performance, with 16% for Kahone, 16% for Bokhol, 18% for Malicounda and 23% for Sakal. Total losses from solar power plants show similar seasonal trends standing out for high loss levels from June to July, reaching up to 3.35 kWh/kWp/day in June. However, using solar trackers at Sakal has increased production by up to 25%, demonstrating the operational stability of this innovative technology compared with the plants fixed panel. Finally, comparing these results with international studies confirms the outstanding efficiency of Senegalese solar power plants, other installations around the world.

关键词： Performance Study Photovoltaic Power Plant Season Variations Senegal

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Characterization of the Omni-Processor Sewage Sludge Ash for Reuse as Construction Material

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Fluid Dynamics & Materials Processing 2022年第6期18卷 1581-1593页

作者： Prince momar gueye Siham Kamali-Bernard Dame Keinde Fabrice Bernard Vincent Sambou LE3PI of E S P-UCAD DakarSenegal LGCGM of INSA of Rennes RennesFrance

Omni Processors(OP)are machines which use sludge as a fuel to generate electricity and clean water,but create ash at the same *** the present study,fly ash and bottom ash are investigated as materials for potential reuse in the construction ***,the granular size,density and Blaine finesse are ***,the chemical composition and microstructure are obtained by means of X-ray fluorescence and Scanning Electron Microscopy-Energy Dispersive Spectroscopy(SEM-EDS),***,ashes reactivity is determined by two chemical methods(modified Chapelle test,bound water content R3)and a mechanical method(pozzolanic activity index).The characterization results indicate two material types:fly ash similar to cement and bottom ash similar to fine ***’s why the mortars mechanical strength with fly ash 0%-30%is better than that with bottom ash at the same *** ash slightly decreases the mechanical strength of mortars while bottom ash induces a much more significant decrease.

关键词： Characterization Omni-processor fly Ash bottom ash

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A New Method for the Determination of Cyanide Ions and Their Quantification in Some Senegalese Cassava Varieties

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American Journal of Analytical Chemistry 2014年第3期5卷 181-187页

作者： Younoussa Diallo momar talla gueye Cheikh Ndiaye Mama Sakho Amadou Kane Jean Paul Barthelemy Georges Lognay Département Génie Chimique et Biologie Appliquée Ecole Supérieure Polytechnique Université Cheikh Anta Diop de Dakar Dakar Sénégal Institut de Technologie Alimentaire Route des Pères Maristes Dakar Sénégal Unité Analyses Qualité Risques et Laboratoire de Chimie Analytique Gembloux Agro-Bio Tech Université de Liège Gembloux Belgique

Cassava (Manihot esculenta Crantz) is a starchy staple food that previous researches have showed to contain cyanogenic compounds, precursors of hydrocyanic acid, undoubtedly toxic for humans. With the aim to determine food security in cassava, this study developed a simple, fast and less expensive step for quantifying cyanide ions by using micro-diffusion with modified Conway cells. After an enzymatic degradation, the cyanide ions were quantified by electrochemical procedures. The validation of this method is estimated. The concentration of cyanide ions at different part of the samples was determined. The results showed high toxicity in some fresh Senegalese consumed cassava varieties (>100 mg HCN·kg﹣1). However, in the processed cassava products, less than 10 mg HCN·kg﹣1 was found in the different varieties studied except for the chips where the levels of CN﹣ contents were important (>49 mg HCN·kg﹣1).

关键词： Cassava Cyanogenic Glycosides Cyanide Ion Micro-Diffusion Toxicity

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Calculations Energy of the (nl2) 1LπDoubly Excited States of Two-Electron Systems via the Screening Constant by Unit Nuclear Charge Formalism

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Journal of Modern Physics 2020年第11期11卷 1891-1910页

作者： momar talla Gning Ibrahima Sakho Malick Sow Department of Experimental Sciences UFR Sciences and Technologies University of Thies Thies Senegal Atoms Laser Laboratory Department of Physics Faculty of Sciences and Technologies University Cheikh Anta Diop Dakar Senegal

In this work, the total energies of doubly excited states (ns2) 1Se, (np2) 1De, (nd2) 1Ge, (nf2) 1Ie, (ng2) 1Ke, and (nh2) 1Me of the helium isoelectronic sequence with Z ≤ 10 are calculated in the framework of the variational method of the Screening Constant by Unit Nuclear Charge (SCUNC). These calculations are performed using a new wavefunction correlated to Hylleraas-type. The possibility of using the SCUNC method in the investigation of high-lying Doubly Excited States(DES) in two-electron systems is demonstrated in the present work in the case of the (nl2) 1Lπ doubly excited states, where accurate total energies are tabulated up to n = 20. All the results obtained in this paper are in agreement with the values of the available literature and may be useful for future experimental and theoretical studies on the doubly excited (nl2) 1Lπ states of two-electron systems.

关键词： Doubly Excited States Helium-Like Systems Screening Constant by Unit Nuclear Charge (SCUNC) Wave Functions Correlated Total Energy

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Development of a Performant Method for Glucocapparin Determination in Boscia senegalensis Lam Ex. Poir.: A Study of the Variability

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American Journal of Analytical Chemistry 2013年第2期4卷 104-110页

作者： momar talla gueye Dogo Seck Abdoulaye Diallo Danny Trisman Christophe Fischer Jean-Paul Barthelemy Jean-Paul Wathelet Georges Lognay Gembloux Agro-Bio Tech Unit Analysis Quality Risks—Laboratory of Analytical Chemistry University of Liege Gembloux Belgium Institute of Food Technology (ITA) Hann-Dakar Senegal Regional Centre for Research in Ecotoxicology and Environmental Safety (CERES/Locustox) Dakar Senegal University of Liege Gembloux Agro-Bio Tech Unit of General and Organic Chemistry Gembloux Belgique

This study describes a glucocapparin determination method. Based on rapeseed determination of glucosinolate (GSL), the equation of the average straight regression line is Y = 100.42X – 0.03 (R2 = 0.9998). Enzymatic hydrolysis of glucocapparin extracted from leaves and fruits of B. senegalensis, analyzed by SPME-GC-MS confirmed the presence of methylisothiocyanate as the main hydrolysis glucocapparin product. Monitoring glucocapparin contents in B. senegalensis leaves and fruits collected in 4 localities in Senegal showed differences between organs according localities and periods of harvest. Glucocapparin content was very high in dry season particularly in January and the lowest rates were recorded during the rainy period between August and November.

关键词： Boscia Senegalensis Validation Method Glucocapparin Monitoring Senegal

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Solution of 1D Poisson Equation with Neumann-Dirichlet and Dirichlet-Neumann Boundary Conditions, Using the Finite Difference Method

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Journal of Electromagnetic Analysis and Applications 2014年第10期6卷 309-318页

作者： Serigne Bira gueye Kharouna talla Cheikh Mbow Département de Physique Faculté des Sciences et Techniques Université Cheikh Anta Diop Dakar-Fann Sénégal

An innovative, extremely fast and accurate method is presented for Neumann-Dirichlet and Dirichlet-Neumann boundary problems for the Poisson equation, and the diffusion and wave equation in quasi-stationary regime;using the finite difference method, in one dimensional case. Two novels matrices are determined allowing a direct and exact formulation of the solution of the Poisson equation. Verification is also done considering an interesting potential problem and the sensibility is determined. This new method has an algorithm complexity of O(N), its truncation error goes like O(h2), and it is more precise and faster than the Thomas algorithm.

关键词： 1D Poisson Equation Finite Difference Method Neumann-Dirichlet Dirichlet-Neumann Boundary Problem Tridiagonal Matrix Inversion Thomas Algorithm

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Generalization of the Exact Solution of 1D Poisson Equation with Robin Boundary Conditions, Using the Finite Difference Method

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Journal of Electromagnetic Analysis and Applications 2014年第12期6卷 372-381页

作者： Serigne Bira gueye Kharouna talla Cheikh Mbow Département de Physique Faculté des Sciences et Techniques Université Cheikh Anta Diop Dakar-Fann Sénégal

A new and innovative method for solving the 1D Poisson Equation is presented, using the finite differences method, with Robin Boundary conditions. The exact formula of the inverse of the discretization matrix is determined. This is the first time that this famous matrix is inverted explicitly, without using the right hand side. Thus, the solution is determined in a direct, very accurate (O(h2)), and very fast (O(N)) manner. This new approach treats all cases of boundary conditions: Dirichlet, Neumann, and mixed. Therefore, it can serve as a reference for solving the Poisson equation in one dimension.

关键词： Robin Boundary Poisson Equation Matrix Inversion

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Production and Characterization of Biodiesel from Rapeseed Oil through Optimization of Transesterification Reaction Conditions

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Journal of Energy and Power Engineering 2019年第10期13卷 380-392页

作者： momar talla Dieng Takumi Iwanaga Yokoyama Christie Yurie Shuichi Torii Department of Advance Mechanical System Engineering Kumamoto UniversityKurokami2-39-1Kumamoto 860-8555Japan Laboratoire de Photonique Quantique d’Energie et de NanoFabrication Facultédes Sciences et TechniquesUniversitéCheikh Anta Diop de Dakar(UCAD)Dakar-Fann DakarB.P.5005Sénégal

In this study,biodiesel fuel was produced from rapeseed oil via transesterification *** optimum reaction conditions were determined by varying alcohol type and its concentration considering their influence on the yield and properties of produced *** and ethanol were alcohol used in the transesterification *** density of biodiesel was measured at 15℃according to EN ISO 12185 test method and its viscosity was determined at 40℃by using a Brookfield digital viscometer(DV-II+Pro).Shimadzu Auto-Calculating Bomb calorimeter CA-4AJ was used to measure the high heating *** optimum transesterification conditions found were alcohol:oil ratio of 18:1,1%of potassium hydroxide as catalyst,60 min of reaction time,60℃of reaction temperature and stirring speed of 650 *** properties under these conditions satisfied the regulatory standards and are slightly similar to those of mineral diesel tested in same *** methanol gives better results compared to ethanol.

关键词： Biodiesel transesterification reaction optimization process rapeseed oil.

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