oalib

Publish in OALib Journal

ISSN: 2333-9721

APC: Only $99

Submit

Any time

2019 ( 4 )

2018 ( 22 )

2017 ( 15 )

2016 ( 15 )

Custom range...

Search Results: 1 - 10 of 305 matches for " Saidou Moustapha Sall "
All listed articles are free for downloading (OA Articles)
Page 1 /305
Display every page Item
Intra-Seasonal and Annual Variation of Aerosols and Their Radiative Impact in the Sahelian Zone of Burkina Faso  [PDF]
Bado Nébon, Mamadou Simina Dramé, Saidou Moustapha Sall, Korgo Bruno, Demba Ndao Niang, Kieno P. Florent, Bathiebo Dieudonné Joseph
Atmospheric and Climate Sciences (ACS) , 2019, DOI: 10.4236/acs.2019.91004
Abstract: This paper deals with the characterization of aerosols in the Sahelian zone, particularly in Burkina Faso based on MODIS observations and in situ measurements of the AERONET network on the Ouagadougou site (12.2°N, 1.4°W). Thus, a seasonal spatial distribution of aerosols made over the period from 2001 to 2016 gives a very great variability of aerosols in Burkina Faso, whose maxima are encountered in Spring, characterized by winds from the North East. This seasonality of aerosols is also shown by the annual cycles of optical, radiative and microphysical parameters measured by AERONET between 1999 and 2006. Moreover, an analysis of these parameters shows the prevalence of mineral dusts characterized by low values of the Angstrom coefficient (α440-870 < 0.5) associated with the maxima of AOT with high intensity in March. These dusts are confirmed by their scattering nature (SSA > 0.9) and the cooling noticed in the bottom of atmosphere (BOA) and at the top of the atmosphere (TOA). Also, the climatology of the volume size distribution of aerosols shows a very great variability of particles in terms of size influenced by the thin and coarse pattern where most sizes are between 1 and 10 μm.
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.
Solid Waste Management in the Town of Maradi in Niger Republic  [PDF]
Hassidou Saidou, Soulé Aminou
Journal of Environmental Protection (JEP) , 2015, DOI: 10.4236/jep.2015.64036
Abstract: As in many towns of African countries, the waste management, in particularly solid constitutes a major problem for the municipal authorities of Maradi. The aim of this study is to make a diagnosis of the present system of waste management in the town of Maradi. To achieve this goal, interviews with municipal authorities, cleaning up and health technicians have been made, as well as investigations among households. According to the health technicians of the town, the causes due to the problem of waste management in Maradi town are: collecting capatown insufficient, lack of effective sensitization of people, undeveloped and uncontrolled rubbish dumps, lack of gutter and its maintenance, and insufficient and unqualified human resources. As to the authorities, they denounce always the attitude and the behavior of citizens on the waste issue. The waste evacuation is done by municipal collecting or by depositing in wild rubbish dump. Some people eliminate their waste by burning or duping in the streets or in their houses. According to our investigations, 52% of population evacuates their waste daily. The satisfaction rate of municipal collecting is for 32%. The analysis showed that the present system of waste management in Maradi town was failing. As to solutions, we proposed to equip the technical offices with appropriated material and financial means, reinforce the involved actor’s capacities and make in application the operatives regulations for the waste management.
Comparative Study of the West African Continental, Coastal, and Marine Atmospheric Profiles during the Summer of 2006
Ibrahima Kalil Kante,Daouda Badiane,Sa dou Moustapha Sall,Abdoulaye Deme,Arona Diedhiou
International Journal of Geophysics , 2012, DOI: 10.1155/2012/603949
Abstract: We used sounding data of the Multidisciplinary Analysis of the African Monsoon experience in summer 2006 at continental and coastal sites of West Africa, respectively, to analyze the vertical profiles of relative humidity, temperature, dew point, and speed and wind direction for the JJAS rainy period. The vertical gradient method is applied to the profiles of some thermodynamic parameters estimated from sounding data to do a comparative study of the structure and thermal properties, moisture, and static stability of the atmospheric boundary layer of inland, coastal, and marine sites to show consistent differences related to geographic factors. In vertical profiles of relative humidity, the intensity is higher in Dakar than in Niamey particularly in the core of the season. There are dry intrusions in the low levels at the beginning and end of the season in Dakar, which do not exist in Niamey. The mixing layer on the continent during the day can reach a height greater than 1100 m, and the inversion layer height can exceed 1700 m. Therefore, the maximum thickness of the boundary layer is observed on the continent during the day, while at night the marine boundary layer is the thickest. The diurnal evolution shows that the mixing layer thickness decreases during the night over the continent but increases at the coast and at sea. In the night at the continental site there is a division of the mixing layer with a consistent residual mixing layer. Continental boundary layer is more unstable during the day, while at night it is the marine boundary layer that is more unstable than the coastal and inland ones.
Comparative Study of the West African Continental, Coastal, and Marine Atmospheric Profiles during the Summer of 2006
Ibrahima Kalil Kante,Daouda Badiane,Sa?dou Moustapha Sall,Abdoulaye Deme,Arona Diedhiou
International Journal of Geophysics , 2012, DOI: 10.1155/2012/603949
Abstract: We used sounding data of the Multidisciplinary Analysis of the African Monsoon experience in summer 2006 at continental and coastal sites of West Africa, respectively, to analyze the vertical profiles of relative humidity, temperature, dew point, and speed and wind direction for the JJAS rainy period. The vertical gradient method is applied to the profiles of some thermodynamic parameters estimated from sounding data to do a comparative study of the structure and thermal properties, moisture, and static stability of the atmospheric boundary layer of inland, coastal, and marine sites to show consistent differences related to geographic factors. In vertical profiles of relative humidity, the intensity is higher in Dakar than in Niamey particularly in the core of the season. There are dry intrusions in the low levels at the beginning and end of the season in Dakar, which do not exist in Niamey. The mixing layer on the continent during the day can reach a height greater than 1100?m, and the inversion layer height can exceed 1700?m. Therefore, the maximum thickness of the boundary layer is observed on the continent during the day, while at night the marine boundary layer is the thickest. The diurnal evolution shows that the mixing layer thickness decreases during the night over the continent but increases at the coast and at sea. In the night at the continental site there is a division of the mixing layer with a consistent residual mixing layer. Continental boundary layer is more unstable during the day, while at night it is the marine boundary layer that is more unstable than the coastal and inland ones. 1. Introduction The term boundary layer was first introduced in the literature by Prandtl and Lustig [1]. Since then, many authors such as Turner [2], Monin [3], Zeman [4] and more, recently, Cushman-Roisin and Beckers [5] have studied the detailed description. The atmospheric boundary layer (ABL) has been variously defined, but it is commonly recognized as the lower part of the atmosphere, which is strongly influenced by the presence of the earth’s surface and responds to surface forcing with a timescale of about one hour or less. The ABL is the place where many processes, such as turbulence, friction, dispersion, energy dissipation, and wind shear occur. These processes are poorly parameterized in atmospheric models. Several ABL studies have focused on the turbulence but also on the mixing process triggered by significant warming or cooling [6]. Within the ABL, the transport of various quantities (heat, pollution, moisture, momentum, etc.) is mainly
Modernization of Public Transports in Senegal: Case of Ticket Payment Method in Dakar Dem Dikk (3Ds) Buses  [PDF]
Sall Ousmane, Diallo Ousmane
Open Journal of Social Sciences (JSS) , 2018, DOI: 10.4236/jss.2018.67013
Abstract: Transport is one of the important keys of growth and socio-economic development for any country. Since 2005, Senegalese authorities have embarked on a vast fleet renewal program to modernize urban transport and professionalize the actors. The purpose of this paper is to sensitize people about the modernization of ticket payment method in Dakar Dem Dikk buses. To achieve this objective, a survey was done through the users and results have shown that the majority of participants agree to adopt the electronic ticketing smart card in public transport. This contactless payment technology is also recommended in commerce sector to facilitate and secure transactions.
Analysis of Bushfires Spatial and Temporal Variability in Guinea  [PDF]
Tamba Nicolas Millimono, Sa?dou Moustapha Sall, Daouda Badiane, Alassane Bah, Moussa Diakhate, Ibra Toure, Mamadou Ba?lo Barry, Diakaria Diallo, Idrissa Diaby
Atmospheric and Climate Sciences (ACS) , 2017, DOI: 10.4236/acs.2017.74034
Abstract: Guinea is confronted to the increasing risks of bushfires that destroy thousands of hectares of vegetation cover every year. Very little research is devoted to the variability of those fires, which makes it a serious threat to both wildlife and human habitats. The current study investigates the spatial and temporal distribution of bushfires in the period from 2003 to 2016. The method used is the geospatial technology: we first filter pixels corresponding with active light supplied by MODIS images (Moderate Resolution Imaging Spectroradiometer) and estimate their densities following the square meshing procedure. Burned areas are deducted from the estimated pixel densities by calculations. The results highlight great occurrence of fires: 4 to 48 pixels of active fire per year and per 100 km2 depending on the location; 2 to 5 million hectares per year of burned areas (20,000 to 50,000 sqkm). Almost 8 to 24% the size of the whole country. The prefectures of Beyla, Siguiri, Kouroussa, Kankan, Dinguiraye, Mali and Tougué are the most exposed areas. Every year, fire activities are observed as from October and between May and June. They are however mitigated according to the regions (or the geographical domains). Summits of bushfires activities are generally reached between December and January.
Heat, Resolvent and Wave Kernels with Multiple Inverse Square Potential on the Euclidian Space Rn  [PDF]
Mohamed Vall Ould Moustapha
Applied Mathematics (AM) , 2014, DOI: 10.4236/am.2014.516249
Abstract: In this paper, the heat, resolvent and wave kernels associated to the Schr?dinger operator with multi-inverse square potential on the Euclidian space Rn are given in explicit forms.
Health challenges in Africa and the way forward
Joses Kirigia, Saidou Barry
International Archives of Medicine , 2008, DOI: 10.1186/1755-7682-1-27
Abstract: Out of 58.03 million people who died globally in 2005, 10.9 million (18.8%) were from the WHO African Region [1]. Majority of deaths (64%) that occurred in the Region resulted from HIV/AIDS (19%), lower respiratory infections (10%), malaria (8%), diarrhoeal diseases (7%), cerebrovascular disease (4%), ischaemic heart disease (3%), tuberculosis (3%), measles (3%), low birth weight (2%), birth asphyxia and birth trauma (2%) and maternal conditions (2%). Even though effective public health interventions that could have prevented most of deaths exist, coverage is low due to weak and under-resourced health systems. Some of the weaknesses can be attributed to challenges related to leadership and governance; health workforce; medical products, vaccines and technologies; information; financing; and services delivery [2].Firstly, there are serious leadership and governance challenges that include weak public health leadership and management [3]; inadequate health-related legislations and their enforcement; limited community participation in planning, management and monitoring of health services; weak inter-sectoral action; horizontal and vertical inequities in health systems [4]; inefficiency in resource allocation and use [5]; and weak national health information and research systems [6].Secondly, extreme shortages of health workers exist in 57 countries of which 36 are in Africa [8]. The crisis has been exacerbated by inequities in workforce distribution and brain drain. Thus, the delivery of effective public health interventions to people in need is compromised particularly in remote rural areas.Thirdly, there is rampant corruption in medical products and technologies procurement systems, unreliable supply systems, unaffordable prices, irrational use, wide variance in quality and safety [2]. This has contributed to current situation where 50% the population in the Region lack of access to essential medicines [6].Fourthly, there is a dearth of information and communication
Tracking a Moving Objects Using Foreground Detector and Improved Morphological Filter  [PDF]
Diallo Mamadou Saidou
Open Access Library Journal (OALib Journal) , 2017, DOI: 10.4236/oalib.1104152
Abstract:
Mobile object detection is one of the most important steps in computer vision applications such as: medical analysis human-machine interface, robotics, traffic monitoring, and more. In this article, we apply the Gaussian mixing model which is established on the background subtraction. A smoothing method was used for the pre-processing step and a morphological filter was applied to remove unwanted pixels from the background in the other to solve the problem of background noise disturbance. We also demonstrated that filtering foreground segmentation twice with the same morphological structured element but with a different width was used to improve the accuracy of the result. The results show that the proposed method is effective in detecting and tracking moving vehicles, compared to filter segmentation in the foreground only once. Several methods and algorithms have been used to solve this problem. All the methods used before have been effective but also have limits. Some of these methods lose the object when the number of frames is wide while others lose it when it changes direction or rolls at a high speed. In addition, the algorithms proposed for the detection of colors in RGB also lose their objectives when the object changes the color. But the proposed combination in this paper maintains contact with the object without losing it even if it changes direction or speed or the number of frame increases.
Page 1 /305
Display every page Item


Home
Copyright © 2008-2017 Open Access Library. All rights reserved.