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.

Optimization of Some Parameters on the Low Efficiency of Solvent Extraction of Uranium with Alamine 336

Abstract: Solvent extraction of uranium from sulfate liquor acid ore with Alamine 336 from two suppliers has been studied. The influence of various parameters, such as sulfuric acid concentration on uranium bearing solutions, concentration of Alamine 336, and concentration of uranium was investigated. The decrease of uranium efficiency extraction at the plant was caused by the degradation of the organic phase. Degradation caused by the presence of vanadium in the uranium ore. Two theoretical stages could efficiency extract more than 90% of uranium from a solution containing 3881 mg/L at O/A ratio of 1.5:1. At the range of sulfuric acid concentration of 0.1 M to 0.2 M, Uranium efficiency was enhanced from 89% to 92 at the 1st contact and from 18% to 20% at the second contact. At this range of concentration, the UO2(SO4) 2 2 species predominate. For sulfuric acid concentrations over 0.2 M the uranium efficiency decreased due to the presence of UO2(SO4) 2 2 and UO2(SO4)3 4species. Improving volume percentage of Alamine 336 in organic phase enhanced the uranium efficiency to 99%. keywords: Optimization, Solvent extraction, Uranium, Alamine 336, Niger plant.

Introduction to the Resolution of d′d′′ for the Supercurrents in the Non-archimedean Frame

Abstract: Chambert-Loir and Ducros introduced a theory of differential forms and real-valued currents on Berkovich spaces using the superforms on polyhedral complexes. In this paper we propose a resolution of the operator of de Rahm for currents defined in an affinoid domain of a space of type Berkovich which happens to be of Stein.

Origins and Pathology of Epithelial Ovarian Cancer: A Brief Overview

Abstract: Since the emergence of data about the natural history of ovarian cancer (OC) approximately 150 years ago, tremendous advances have been made in the area of the molecular pathology of this aggressive cancer. However, OC remains one of the most lethal gynecological cancers worldwide, with no adequate screening and prevention program available yet to avoid diagnosis in advanced stages. Despite OC still being the silent killer, it has seen dynamic shifts in its classification, staging, and theories regarding its origins in the last years. In fact, the term OC has experienced a shift to include primary peritoneal and tubal cancer, as these tumors behave identically. The prognosis and treatment of OC are dependent on multiple factors, including tumor biology and extent of tumor spread, which has recently been reclassified in a new FIGO staging system. In the literature throughout the years, attempts to identify the origins of these heterogeneous tumor entities have better guided our diagnostic strategies and therapeutic arsenal. This chapter aims to give a general overview of the epidemiology, the natural history as well as the pathology of epithelial OC.

Cancer du rectum et pauvreté : « une fracture médicale » !

Abstract: Rapporter les difficultes et les ecarts par rapport aux recommandations dans la prise en charge des cancers du rectum dans les pays en voie de developpement: cas de l’Hopital national de Niamey (Niger). Il s’agissait d’une etude retrospective sur quatre ans concernant 36 patients admis pour prise en charge d’un cancer du rectum ayant eu au prealable un diagnostic histologique. Il s’agissait de 21 hommes et de 15 femmes. L’âge moyen de nos patients etait de 44,5 [±10,5] ans avec des extremes allant de 27 a 76 ans. La moitie provenait de milieux defavorises. L’adenocarcinome lieberkuhnien etait le type histologique le plus frequent (91,6 %). Cependant, une tumeur stromale gastro-intestinale, un carcinome epidermoide et un carcinome mucineux ont ete retrouves. Dans 77,7 % des cas, la lesion siegeait sur le bas et/ou le moyen rectum. Le bilan diagnostique etait fonde sur l’endoscopie digestive pratiquee chez 77,7 % des patients et le scanner pratique chez 27,7 % des patients. La radiographie pulmonaire etait l’examen de bilan d’extension a distance le plus souvent realise (97,2 %). Il n’y a pas eu d’echoendoscopie ni d’imagerie par resonance magnetique. Un de nos patients avait eu une radiochimiotherapie neoadjuvante et quatre (11,1 %) une chimiotherapie adjuvante seule. La resection anterieure du rectum etait l’intervention la plus realisee (39,8 %), suivie d’une anastomose colorectale chez la moitie des operes. La mortalite a un an etait de 6,1 %. L’absence de moyens diagnostiques et l’absence et/ou l’inaccessibilite des moyens therapeutiques sont a la base d’une reelle « fracture medicale ».