Abdou Moumouni University

About: Abdou Moumouni University is a education organization based out in Niamey, Niamey, Niger. It is known for research contribution in the topics: Population & Agriculture. The organization has 796 authors who have published 808 publications receiving 17478 citations. The organization is also known as: University of Niamey & Abdou Moumouni Dioffo University.

On the benefit of cooperation in three-person games

Abstract: Three-person games in which each player maximizes his payoff function are considered. The question on the benefit of forming a coalition of three players, which is interesting for cooperative game theory, is studied. The aim of the cooperation is that each player increases his guaranteed payoff. Effective sufficient conditions are obtained under which the coalition of the players is beneficial for each of them. The linear case is considered separately. In this case, rather general results are obtained in a constructive form. In the second part of the paper, the question on the benefit of cooperation of three players in the presence of the fourth player—Nature—is studied. The behavior of Nature is assumed to be unpredictable; it may harm any individual player or the coalition of the players. Note that the situation considered in the second part is related to A.V. Kryazhimskii’s talk delivered in the summer of 2014. We obtain constructive conditions under which the union of the players is beneficial in this situation as well.

Etude préliminaire du contenu sporo-pollinique et caractérisation des grès ferrugineux de la formation du Continental Terminal, Bassin de Kandi (Nord-Est Bénin)

Abstract: The sporo-pollenic study of the oolitic ironstone of the Kandi Basin in the northeastern part of Benin allowed a paleoenvironmental reconstitution during the Oligocene and Miocene periods. The Taxonomic diversity is characterized by grasses including "graminidites neogenicus" and arecaceae represented by "Hyphaene Thebaica", characteristic of "hot and dry tropical environments". These species also characterize a grassy savannah. The graminidites neogenicus is a Miocene flagship and the ferruginous sandstone of the Continental Terminal has been dated of Oligocene in age. We thus attribute an Oligo-Miocene age to the Formation of the Continental Terminal of the Kandi Basin. While the medium has long been considered azo, microscopic analysis has revealed plant fossils made up mostly of fruits. The oolitic iron ore of the Kandi Basin took place in a reducing lacustrine environment in which plants such as gramineae (Graminidites neogenicus) and arecaceae (Hyphaene Thebaica) lived. L’etude sporo-pollinique des gres de la formation du Continental Terminal du Bassin de Kandi, au Nord-Est du Benin, a permis de faire une ebauche de reconstitution paleoenvironnementale pour la periode allant de l’Oligocene au Miocene. La diversite taxonomique est representee par des graminees notamment par l’espece Graminidites neogenicus et des arecaceae representes par l’espece Hyphaene Thebaica, caracteristiques des "milieux tropicaux chauds et sec". Ces especes caracterisent egalement une savane herbeuse. Le Graminidites neogenicus est une espece phare du Miocene et les gres ferrugineux du Continental Terminal ont ete dates de l’Oligocene. Nous attribuons ainsi un âge Oligo-Miocene a la formation du Continental Terminal du Bassin de Kandi. Alors que le milieu est longtemps considere comme azoique, l’analyse microscopique a revele des fossiles vegetaux constitues majoritairement de fruits. Le minerai de fer oolithique du Bassin de Kandi s’est donc mis en place dans un milieu lacustre de type reducteur, dans lequel vivaient des vegetaux tels que les gramineae (Graminidites neogenicus) et les arecaceae (Hyphaene Thebaica).

Co-Infection COVID-19 et Tuberculose : à propos de deux Cas à l’Hôpital National de Zinder-Niger

Abstract: La COVID-19 et la tuberculose affectent principalement les poumons. Ces deux pathologies peuvent presenter des signes cliniques communs. Deux patients febriles, presentant des signes cliniques respiratoires, d’evolution chronique, avaient consulte au site d’isolement COVID-19 en janvier 2020. Le motif de consultation etait la survenue d’une dyspnee aigue. Le diagnostic de la COVID-19 a ete confirme par RT-q PCR et celui de la tuberculose par bacilloscopie et Genexpert. Un traitement a base d’hydroxy-chloroquine plus azithromycine et des antituberculeux etait institue. L’evolution clinique, virologique et radiologique a ete favorable. Nous rapportons les caracteristiques cliniques, biologiques radiologiques, therapeutiques et evolutives de cette coinfection.

Caractérisation Physico-Chimique Des Lixiviats Des Décharges : Cas De La Décharge Non Contrôlée De Niamey 2000 (Niamey-Niger)

Abstract: Les lixiviats produits au niveau des decharges constituent un grand danger pour l’environnement. Dans le but de repondre aux questions d’un environnement sain, une analyse physico-chimique des lixiviats a ete faite. Les prelevements ont ete effectues entre 13 et 16 heures au niveau de differents endroits de la decharge. Les parametres determines sont : la temperature, le pH, la conductivite electrique, l’oxygene dissous, les matieres en suspension, la turbidite, les cations (sodium, potassium, calcium, magnesium et ammonium), les anions (sulfate, chlorure, nitrate, ortho-phosphates et bicarbonate), les elements traces metalliques (fer, cuivre, le chrome, le cadmium, le nickel, le cobalt et le zinc) par un spectrophotometre DR 3800 de marque Hach, la DBO5 et la DCO. Les resultats des analyses montrent que les lixiviats produits a la decharge de Niamey 2000 sont basiques (pH minimal 7,6), tres charges en matieres en suspension (590mg/L), tres turbides (297NTU) et tres pollues (oxygene dissous inferieur a 3mg/L). La pollution minerale est caracterisee par une forte conductivite electrique moyenne de 2441,5 μS/cm, une forte concentration en chlore (1276,5 mg/L) et en orthophosphates (3,31mg/L). La charge organique est traduite par une DCO moyenne de 2248mgO2/L et une DBO5 moyenne de 530mgO2/L. Les lixiviats etudies sont caracterises par des concentrations elevees en element fer, zinc, cadmium et cuivre qui sont respectivement en mg/L de 9,26 ; 8,75 ; 0,19 et 2,3. Les elements comme le nickel et le chrome sont presents a des teneurs inferieures aux limites fixees par la norme nigerienne de rejet. Landfill leachate is a great danger to the environment. In order to answer the questions of a healthy environment, the leachates produced at the Niamey 2000 landfill site were characterized. Samples were taken at various points around 1 and 4 o’clock in the landfill. The parameters determined are: temperature, pH, electrical conductivity, dissolved oxygen, suspended solids, turbidity, cations (sodium, potassium, calcium, magnesium and ammonium), anions (sulfate, chloride, nitrate) , ortho-phosphates and bicarbonate), metallic trace elements (iron, copper, chromium, cadmium, nickel, cobalt and zinc) by a Hach DR 3800 spectrophotometer, BOD5 and COD. The results of the analyzes show that the leachates produced at the Niamey 2000 landfill are basic (minimum pH 7.6), highly charged with suspended matter (590mg / L), very turbid (297NTU) and highly polluted (dissolved oxygen less than 3mg / L). The mineral pollution is characterized by a high average electrical conductivity of 2441.5 μS / cm, a high concentration of chlorine (1276.5 mg / L) and orthophosphates (3.31 mg / L). The organic load is translated by an average COD of 2248mgO2 / L and an average BOD5 of 530mgO2 / L. These leachates are characterized by high concentrations of iron, zinc, cadmium and copper which are respectively in mg / L of 9.26; 8.75; 0.19 and 2.3. Elements such as nickel and chromium are present at levels below the limits set by the Nigerian release standard.

Influence De La Géomorphologie Sur La Distribution Spatiale Des Peuplements De Boscia Senegalensis (Pers.) Lam. Ex Poir. Dans La Commune Rurale De Simiri (Ouest Niger)

Abstract: B. senegalensis is a species with broad geographic distribution in the Sahel, especially in Niger, thanks to its special anatomical structures to withstand drought, high temperatures and poor soils. It presents and a heterogeneous distribution in the following areas topographic levels characteristic of the western Niger. This paper aimed to assess the distribution of B. senegalensis and its relationship with woody species through the description of the spatial structure of the point process following toposequences by Ripley's method stands. The study highlighted the gregarious distribution of B. senegalensis and the close relationship between B. senegalensis and other species. Indeed, the species is in competition with other species on the plateau where water resources are scarce. But B. senegalensis tolerate these species on the slopes and in the shallows where water resources are relatively large.