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Petro-Structural Study of the Paleoproterozoic Formations of the Faboula Gold Deposit (Bougouni-Kékoro Basin, Leo-Man Shield)

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Open Journal of Geology 2021年第4期11卷 105-141页

作者： ousmane Wane Amadou Baby Ouologuem Ismaïla N’diaye ousmane Dao Mamadou Yossi Laboratoire de Minéralogie et de Pétrologie Faculté des Sciences et Techniques Université des Sciences des Techniques et des Technologies de Bamako BP E 3206 Colline de Badalabougou Bamako Mali Faculté des Sciences et Techniques Université des Sciences des Techniques et des Technologies de Bamako BP E 3206 Colline de Badalabougou Bamako Mali Sagax Afrique S.A Geophysical Surveys and Consulting Ouagadougou Burkina Faso

Recent petro-structural investigations on the Faboula gold deposit located in the Bougouni-Kékoro basin, in southern Mali, north-west of the Leo-Man Shield, have provided new data on the nature and spatial organization of the lithostratigraphic units as well as their deformation style. The deposit is covered by a thick lateritic layer and is hosted by a metavolcano-sedimentary sequence of Paleoproterozoic age intersected by intrusive bodies and filled fractures of various shapes and types. The lithostratigraphic units consist of metagreywackes, metasiltstones, meta-argillites, slates and schists. Metagreywackes and metasiltstones are generally feldspathic, both may contain biotite and locally amphibole, just as slates may contain andalusite which is locally stretched. Plutonic units most often occur as stocks or as dikes on the drill core, up to 1 m. The metavolcano-sedimentary rocks are schistose and deformed under greenschist facies conditions, and locally they reach the epidote-amphibolite facies. The structural study revealed that the deposit is affected by several stages of deformation evolving from a ductile type to a brittle type via a ductile-brittle type. The dominant ductile and brittle-ductile deformations show a combination of isoclinal folding and strike-slip faults. Both the isoclinal folding and the strike-slip faults whose sigmoidal en-echelon tension gashes indicate a dextral movement in the NNE-SSW direction are the result of the same ENE-WSW regional shortening. Consequently, they highlight a transpressive deformation. This deformation noted here D2Fb, could

关键词： Faboula Gold Deposit Metavolcano-Sedimentary Rocks Deformation Paleoproterozoic Transpression Drill Cores Southern Mali Leo-Man Shield

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New Overview of the Energy Classification of Underlays

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Journal of Applied Mathematics and Physics 2022年第3期10卷 828-836页

作者： Souleymane Balde ousmane Barry Aboubacar Safie Sylla Department of Chemistry University Gamal Abdel Nasser of Conakry Conakry Guinea

This article focuses on a new insight into the energy classification of sublayers. In this article, the study brings out very interesting and enriching information, knowledge and knowledge in atomistics. An affine function is represented in an orthonormal frame while assimilating a point to a sublayer. This made it possible to draw up a graph integrating each of the diagrams of the known energy levels. Our results are conclusive. We can then confirm that the research hypothesis is verified.

关键词： Atomistics Affine Equation Element Quantum Numbers Energy Level Period Order

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Conformity Assessment of Lead Aprons Used in Conventional Radiology:A Multi-Centre Survey in Togo

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Open Journal of Radiology（放射学期刊） 2024年第2期 55页

作者： Massaga Dagbé Bidamin N’timon ousmane Aminata Bah Pihou Gbandé Komi Awobanou Koku Adambounou Masamaesso Tchaou Abdoulatif Amadou Lantam Sonhaye Lama Kegdigoma Agoda-koussema Komlanvi Victor Adjénou

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Potential for Green Hydrogen Production from Biomass, Solar and Wind in Togo

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Smart Grid and Renewable Energy 2022年第2期13卷 17-27页

作者： Mawunyo Simon Pierre Kitegi Yendoube Lare ousmane Coulibaly WASCAL Alumni School of Informatics for Climate Change Ouagadougou Burkina Faso Solar Energy Laboratory Physics Department Université de Lomé Lomé Togo Laboratory of Physics and Environment Chemistry School of Informatics for Climate Change Université Joseph Ki-Zerbo Ouagadougou Burkina Faso

Potential of green hydrogen producing from biomass, solar and wind in Togo has been performed. The availability of these three resources has been depicted with maps showing them per cantons in Togo, thus, by using the datasets from ESA Biomass Climate Change Initiative, the global solar atlas and the global wind atlas. The conversions rates used were: for solar resource, 3% of land was allocated for the analysis after removing the exclusions with a conversion rate of 52.5 kWh/kg of hydrogen;for biomass hydrogen, the conversion rate of 13.4 kg BS/kg H2 was assumed. Wind resources at 50 m above ground were not sufficient to evaluate the potential as it is lower than class 3 winds. QGIS version 3.6.4 and R version 4.0.4 were used. Results showed that biomass is the leading resource for producing green hydrogen from renewable energy resources;with good impact in these two cantons: Bassar, Gobe/ Eketo/Gbadi N’Kugna. However, this resource is still decreasing and in some cantons it is null.

关键词： Green Hydrogen Potential Solar Wind Biomass Climate Change

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Estimated Bounds for Zeros of Polynomials from Traces of Graeffe Matrices

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Advances in Linear Algebra & Matrix Theory 2014年第4期4卷 210-215页

作者： ousmane Moussa Tessa Maimouna Salou Morou Amidou Département de Mathématiques et d’informatique Université A. Moumouni de Niamey Niamey Niger Institut de Recherche sur l’Enseignement des Mathématiques Université A. Moumouni de Niamey Niamey Niger

In this paper, we combine Graeffe matrices with the classical numerical method of Dandelin-Graeffe to estimate bounds for the moduli of the zeros of polynomials. Furthermore, we give some examples showing significant ... 详细信息

关键词： Graeffe Matrices Numerical Approximation of Eigenvalues Dandelin-Graeffe’s Method Bounds of Zeros of Polynomial

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考虑应力敏感和孔隙受限的致密油藏组分数值模拟研究

考虑应力敏感和孔隙受限的致密油藏组分数值模拟研究

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作者： ousmane Mahamadou Nassourou 中国石油大学(华东)

学位级别：硕士

致密油储层具有纳米级孔隙和较高应力敏感性等特征,这些特征使多孔介质流体流动变得复杂。最近,研究表明,毛管压力和应力敏感性的影响对致密油藏的产能具有不可忽略的影响,而当前的油藏数值模拟技术通常忽略了孔隙尺度受限相态效应和应... 详细信息

致密油储层具有纳米级孔隙和较高应力敏感性等特征,这些特征使多孔介质流体流动变得复杂。最近,研究表明,毛管压力和应力敏感性的影响对致密油藏的产能具有不可忽略的影响,而当前的油藏数值模拟技术通常忽略了孔隙尺度受限相态效应和应力敏感性的影响。因此,本文的目的是建立一种能够模拟致密油藏中多相、多组分流体复杂流动的组分模型。本文的研究成果为建立了一个致密油藏组分模型,包括数学模型、数值公式和求解方法,形成的模拟器EMC-COM能够模拟致密油储层中多相流体流动的孔隙受限相态以及应力敏感性的影响。受限相态效应通过将毛管压力引入到气液平衡计算中进行考虑,而应力敏感性效应则采用与应力有关的渗透率模型。模拟结果表明,受限相态效应对产能影响较大。考虑受限相态效应后,泡点压力下降,储层气体饱和度变小,从而使得在地面条件下产出油增多。另外,毛管压力对泡点压力的抑制作用导致了更多的轻质烃组分溶解在油相中。应力敏感性通过影响岩石性质进而影响产能,同时应力敏感性效应还增加了毛细管压力,因此导致了孔径缩小,并进一步抑制了饱和压力。本研究中使用的模型是二维的,并且能够对致密油藏中的复杂裂缝进行模拟。开发的EMC-COM模拟器可以模拟致密油藏中复杂的多相、多组分流体流动现象,对致密油藏开发提供有效指导。

关键词：致密油藏组分模型气液平衡毛管压力应力敏感性

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Bounds for Polynomial’s Roots from Fiedler and Sparse Companion Matrices for Submultiplicative Matrix Norms

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Advances in Linear Algebra & Matrix Theory 2021年第1期11卷 1-13页

作者： Mamoudou Amadou Bondabou ousmane Moussa Tessa Amidou Morou Département de Mathématiques et d’Informatique Université Abdou Moumouni Niamey Niger Institut de Recherche sur l’Enseignement des Mathématiques Université A. Moumouni de Niamey Niamey Niger

We use submultiplicative companion matrix norms to provide new bounds for roots for a given polynomial P(X) over the field C[X]. From a n×n Fiedler companion matrix C, sparse companion matrices and triangular Hessenberg matrices are introduced. Then, we identify a special triangular Hessenberg matrix Lr, supposed to provide a good estimation of the roots. By application of Gershgorin’s theorems to this special matrix in case of submultiplicative matrix norms, some estimations of bounds for roots are made. The obtained bounds have been compared to known ones from the literature precisely Cauchy’s bounds, Montel’s bounds and Carmichel-Mason’s bounds. According to the starting formel of Lr, we see that the more we have coefficients closed to zero with a norm less than 1, the more the Sparse method is useful.

关键词： Fiedler Matrices Polynomial’s Roots Bounds for Polynomials Companion Matrices Sparse Companion Matrices Hessenberg Matrices Submultiplicative Matrix Norm

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Eco Insulation Materials： Reduction of Cooling Loads of a House Made of Breeze Block or Laterite in a Dry Tropical Climate

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Journal of Energy and Power Engineering 2014年第7期8卷 1246-1250页

作者： ousmane Coulibaly David Yemboini Kader Toguyeni LPCE (Laboratoire de Physique et de Chimie de l 'Environnement) UO-UFR/SEA (Universite de Ouagadougou Unite de Formation et Recherche en Sciences Exactes et Appliquees) Ouagadougou 03 BP 7021 Burkina Faso

In this paper, we study the influence ofeco materials for roof insulation and fiber-reinforced mortar coatings on cooling loads of a home in dry tropical climate. The walls of the house are made of cinderblock or laterite and the insulating material of a roof panel is made with lime （24%）, cement （6%）, water （50%） of vegetable fibers hibiscus sabdariffa （16%）, tree widespread in Burkina Faso and sugar cane bagasse （4%）. This panel roof insulation and the fiber-reinforced mortar were characterized at the Laboratory of Physics and Chemistry of the environment by the hot plate method. The building is modeled in TRNSYS using climate data from the city of Ouagadougou. The results obtained show that in the warmer months of the year, that is to say in March and April, the relative differences between heat gains the configurations ＂breeze block-coating mortar and roof not insulated＂ and ＂laterite- fiber-reinforced mortar coating and insulated roof＇ vary between 15.6% and 16.8%. The configuration ＂laterite-fiber-reinforced mortar coating and insulated roof allows a reduction of annual heat gains of 15.5% compared to the configuration ＂breeze block-coating mortar and roof not insulated＂.

关键词： Hot-plate approach laterite fiber-reinforced mortar TRNSYS model cooling load.

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BOUNDARY ELEMENT METHOD APPLICATION IN SOLIDS AND STRUCTURES

BOUNDARY ELEMENT METHOD APPLICATION IN SOLIDS AND STRUCTURES

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第三届亚太国际工程中计算方法学术会议ICOME2009暨第九届全国工程中边界元、无网格等数值方法学术会议

作者： ousmane MARIKO Jiang CANGRU Department of School of Civil Engineering the Wuhan University of Technology

During the last 30 years or so, Boundary Element Methods (BEM) have been developed and successfully applied to the solution of a variety of engineering problems. BEM are at their best when applied to linear static or dynamic problems. However, during the last 15 years or so, BEM have also been successfully applied to the solution of a variety of materially and geometrically nonlinear problems. When non-linearities are present, the BEM loose their dimensionality reduction advantage over Finite Element Methods (FEM) since an interior discretization is necessary in addition to the boundary one. However, some advantages of BEM over FEM are still present.

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Bounds for Polynomial’s Roots from Hessenberg Matrices and Gershgorin’s Disks

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Advances in Pure Mathematics 2021年第12期11卷 963-977页

作者： Mamoudou Amadou Bondabou ousmane Moussa Tessa Maimouna Salou Département de Mathématiques et d’informatique Université A. Moumouni Niamey Niger

The goal of this study is to propose a method of estimation of bounds for roots of polynomials with complex coefficients. A well-known and easy tool to obtain such information is to use the standard Gershgorin’s theorem, however, it doesn’t take into account the structure of the matrix. The modified disks of Gershgorin give the opportunity through some geometrical figures called Ovals of Cassini, to consider the form of the matrix in order to determine appropriated bounds for roots. Furthermore, we have seen that, the Hessenbeg matrices are indicated to estimate good bounds for roots of polynomials as far as we become improved bounds for high values of polynomial’s coefficients. But the bounds are better for small values. The aim of the work was to take advantages of this, after introducing the Dehmer’s bound, to find an appropriated property of the Hessenberg form. To illustrate our results, illustrative examples are given to compare the obtained bounds to those obtained through classical methods like Cauchy’s bounds, Montel’s bounds and Carmichel-Mason’s bounds.

关键词： Bounds for Roots of Polynomials Gershgorin Frobenius Companion Matrix Hessenberg Matrices Ovals of Cassini

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