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Search Results: 1 - 10 of 221 matches for " Adamou Mahaman Moustapha "
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Influence of Re-Greening on the Infiltrability of Soils in South-Central Niger  [PDF]
Adamou Mahaman Moustapha, Issoufou Baggnian, Nazoumou Yahaya, Toudou Adam
Journal of Water Resource and Protection (JWARP) , 2014, DOI: 10.4236/jwarp.2014.619155
Abstract: In the Sahel, the climate and the agricultural practices are the main factors used to observe regreening process. But the extension of the latter not being uniform in the farming fields, we can suppose that there are other factors that contribute to the re-greening of certain zones and not others. The infiltrability of soils is considered as an important factor for these changes in the last decades. The influence of re-greening on the infiltrability of soils in the southern strip of Niger was studied through a comparison of zones according to the type of sandy soils (Jigawa/Rerey), siltyclay (Guiéza), silty-sandy (Hako) and clay-silty-sandy (Laka). The evaluated parameters are the texture, the infiltrability and the ecological characteristics (specific index of regeneration “SIR” and the Importance Value Index “IVI”). The main conclusions were: the soils of Niger South-Central are characterized by a sandy texture for more than 80%. The soils which are very sandy (“Jigawa”, “Rerey” and “Guieza”) are more permeable and have more trees contrary to the soil Hako and Laka. Their encrusting has the tendency to reduce the vegetation cover on the soil. The infiltration measurements indicated that the rate of initial and stationary infiltration diminishes while going down towards the South. In fact, it has been recorded a rate of 123 mm/min of initial infiltration and 87 mm/min stationary in Dan Saga on the sandy soils against 76 mm/min and 65 mm/min in Daré respectively for the initial and stationary rate. Therefore, the infiltration seems to influence the density, the SIR and the IVI of the trees from the North towards the South. Some additional work is necessary in order to determine the contribution of Farmer Managed Natural Regeneration (FMNR) in the improvement of the quality of soils and the movement of water in the superficial zones of the soil.
Groundwater Annual Dynamics in the Basins of Woro and Chago (Eastern Niger) as Affected by Seasonal Variability and Anthropic Activities  [PDF]
Adamou Mahaman Moustapha, Nazoumou Yahaya, Aw Sadat, Awaiss Yahaya, Ambouta Karimou
Journal of Water Resource and Protection (JWARP) , 2013, DOI: 10.4236/jwarp.2013.59094
Abstract:

The Sahelian region is known to have extremes climatic constraints since the end of the seventies. The studied zone is characterized by an extreme spatial and temporal variability of the environmental factors, complicating the understanding of the mechanisms governing the functioning of the hydrological system in the basin. The evapotranspiration was very high (1975 mm/an), whereas the local annual rainfall was around 300 mm/year. The piezometric data showed a rise of the groundwater level during the rainy season and a decrease in the dry season. The water balance obtained using the Penman-Monteith method showed the predominance of the evapotranspiration (75% to 80% of the rainfall) on the drainage (20% to 25% of the precipitations).

Evaluation of Heavy Metals Loading of Yamoussoukro Lake System (C TE D’IVOIRE)
AW Sadat,Kouakou Koffi Amoulaye,Adamou Mahaman Moustapha,Siaka Sorho
Research Journal of Environmental and Earth Sciences , 2013,
Abstract: The present study was conducted to provide baseline data for metal concentration in Yamoussoukro lake system, a tropical lake system. For this purpose, seventeen stations were selected as sampling sites. Water samples were collected monthly, between January and December 2011 and analyzed using Inductively Coupled Plasma (ICP-OES) spectrometer to determine metal content. Iron (Fe), Manganese (Mn), Zinc (Zn), Copper (Cu) and lead (Pb) concentration were determined. On average, the level of heavy metal varied from 0.005±0.011 to 1.048±0.421 for Fe, 0.012±0.003 to 0.440±0.137 for Mn, 0.192±0.054 to 0.347±0.045 for Zn, 0.008±0.02 to 0.019±0.005 for Cu and 0.015±0.005 to 0.021±0.003 for Pb; all in mg/L. Heavy metals presented in the study area presented en heterogeneous variation and iron tops the list with a value of 111.52%. Furthermore, all the samples analyzed contained the five heavy metals studied each in varying concentrations. These parameters concentrations indicated that the Yamoussoukro lake system is fairly polluted according to the WHO standards.
Management of Urban Wastewater in the City of Maradi (Niger): The Case of Domestic Wastewater  [PDF]
Saidou Hassidou, Laminou Ary Mahaman Moustapha
Journal of Geoscience and Environment Protection (GEP) , 2015, DOI: 10.4236/gep.2015.33003
Abstract: Uncontrolled urbanization of African cities and the lack of municipal waste management services in these cities make landscapes become places of multiple and varied interactions between health and environment. In this sense, under strong urban growth in a context of sub-equipment sanitation, the city of Maradi doesn’t escape to this situation which results in the spread of pollution (release of unpleasant odors, and proliferation of mosquitoes) and many diseases posing multiple health problems. Our study focuses only on liquid waste especially domestic wastewater. To study the different domestic wastewater management options in the town of Maradi, a survey was conducted among 340 households in 17 districts. We note in most cases a crucial of waste management infrastructure (drainage and wastewater treatment) in the city. Thus, only the individual sanitation facilities are used. In the town of Maradi, in addition to the storm drains, there are, in old districts, ditches that discharge wastewater and unfortunately end up in rivers without treatment. Total domestic wastewater production is estimated at 86761.28 m3 per day. This water is mostly from laundry activities, bathing, dishes, and is discharged in large part through the streets, by more than 60% of households. Also, pit emptying is performed at 39.11% by the vehicle Peugeot tank. The quality of service rendered by an actor is very important to encourage households to join. Existing autonomous sanitation facilities are poorly designed and poorly maintained. Fecal sludge is dumped in a hole near saturated latrines; this work is mainly done by manual scavengers or dumped in fields or on nearby vacant land concessions.
Twin Reverse Arterial Perfusion (TRAP): Case Report  [PDF]
Natalia Adamou, Ibrahim Yakasai
Open Journal of Obstetrics and Gynecology (OJOG) , 2014, DOI: 10.4236/ojog.2014.416147
Abstract: The twin reversed arterial perfusion (TRAP) sequence is an anomaly unique to monochorionic multiple pregnancies. It is a rare complication. We present a case of acardius anephus, which was mistaken for a live anomalous singleton fetus. A 21-year-old unbooked Primigravida was seen in labour ward with a ten hours history of labour pains. Urgent transabdominal ultrasound revealed a singleton live fetus at 30 weeks gestation with gross cystic mass lesion at the level of the abdomen and polyhydramnious. Caesarean section confirms a twin gestation with monoamniotic monochorionic single placenta. The umbilical cord of the acardiac twin was short—First twin was a live female baby, weighing 1000 g. TRAP is a rare event an early referral to feto maternal unit will improve perinatal outcome.
The Adoption of Instructional Techniques and Educational Technologies among Teaching  [PDF]
Salissou Mahaman Halimatou, Xiuqing Yang
Creative Education (CE) , 2014, DOI: 10.4236/ce.2014.524230
Abstract: The development of technology in daily life continues to show its effects on the behavior of human beings. Their integration in the field of education is an asset to the effectiveness of learning for both the teacher and the learner. However, some people tend to confuse instructional technics with educational technologies, while these concepts are different and have their roles in the process of learning. This paper first defines the three concepts in education namely instructional technics, educational technologies and learning theories, and highlights their characteristics. It also introduces the influence of educational technologies in instructional techniques, their advantages and inconvenience and ends with suggestions to improve them to be more suitable and profitable.
Manifolds with Bakry-Emery Ricci Curvature Bounded Below  [PDF]
Issa Allassane Kaboye, Bazanfaré Mahaman
Advances in Pure Mathematics (APM) , 2016, DOI: 10.4236/apm.2016.611061
Abstract: In this paper we show that, under some conditions, if M is a manifold with Bakry-émery Ricci curvature bounded below and with bounded potential function then M is compact. We also establish a volume comparison theorem for manifolds with nonnegative Bakry-émery Ricci curvature which allows us to prove a topolological rigidity theorem for such manifolds.
Erratum to “Manifolds with Bakry-Emery Ricci Curvature Bounded Below”, Advances in Pure Mathematics, Vol. 6 (2016), 754-764  [PDF]
Issa Allassane Kaboye, Bazanfaré Mahaman
Advances in Pure Mathematics (APM) , 2017, DOI: 10.4236/apm.2017.711039
Abstract: The original online version of this article (Issa Allassane Kaboye, Bazanfaré Mahaman (2016) Manifolds with Bakry-Emery Ricci Curvature bounded below 6, 754-764. http://dx.doi.org/10.4236/apm.2016.611061 unfortunately contains a mistake. The author wishes to correct the errors.
La faiblesse des mouvements de revendication contre la pauvreté en Afrique sub-saharienne : De la prévalence du plaidoyer à l'action militante globale
Mahaman Tidjani
Ceriscope , 2012,
Abstract: Ce texte analyse les dynamiques des mouvements sociaux dans les revendications liées à la lutte contre la pauvreté en Afrique. Il montre comment l'accroissement de l'activisme des organisations n'a eu qu'un impact direct limité au cours de ces dernières décennies sur la lutte contre la pauvreté. L'internationalisation de des revendications des mouvements sociaux a fait progressivement émerger une société civile internationale extrêmement active sur le terrain de la lutte contre la pauvreté et à laquelle les organisations africaines ont pris une part de plus en plus grande. Cette participation renouvelle les idées et les modes d'action sur les terrains d'intervention à l'échelle locale. L'article établit un état des lieux du militantisme des mouvements sociaux, s'intéresse à la lutte contre la pauvreté, thème qui émerge que lentement au sein de ces organisations à la faveur du déplacement et du renouvellement des terrains en lien direct avec leur implication dans les luttes qui prennent forme dans les arènes internationales.
Sphere Theorem for Manifolds with Positive Curvature
Bazanfare Mahaman
Mathematics , 2004,
Abstract: In this paper, we prove that, for any integer $n\ge 2,$ there exists an $\epsilon_{n} \ge 0$ so that if $M$ is an n-dimensional complete manifold with sectional curvature $ K_{M}\ge 1$ and if $M$ has conjugate radius bigger than $\frac{\pi}{2} $ and contains a geodesic loop of length $2(\pi -\epsilon_{n}),$ then $M$ is diffeomorphic to the Euclidian unit sphere $S^{n}.$
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