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Search Results: 1 - 10 of 159 matches for " Abdourahamane Konaré "
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Sensitivity of Solar Photovoltaic Panel Efficiency to Weather and Dust over West Africa: Comparative Experimental Study between Niamey (Niger) and Abidjan (C?te d’Ivoire)  [PDF]
Alima Dajuma, Saleye Yahaya, Siaka Touré, Arona Diedhiou, Rabani Adamou, Abdourahamane Konaré, Mariama Sido, Michel Golba
Computational Water, Energy, and Environmental Engineering (CWEEE) , 2016, DOI: 10.4236/cweee.2016.54012
Abstract: Energy demand is increasing while we are facing a depletion of fossils fuels, the main source of energy production in the world. These last years, photovoltaic (PV) system technologies are growing rapidly among alternative sources of energy to contribute to mitigation of climate change. However, PV system efficiency researches operating under West African weather conditions are nascent. The first objective of this study is to investigate the sensitivity of common monocrystalline PV efficiency to local meteorological parameters (temperature, humidity, solar radiation) in two contrasted cities over West Africa: Niamey (Niger) in a Sahelian arid area and Abidjan (Cote d’Ivoire) in atropical humid area. The second objective is to quantify the effect of dust accumulation on PV efficiency in Niamey (Niger). The preliminary results show that PV efficiency is more sensitive to high temperature change especially under Niamey climate conditions (warmer than Abidjan) where high ambient temperatures above 33°C lead to an important decrease of PV efficiency. Increase of relative humidity induces a decrease of PV efficiency in both areas (Niamey and Abidjan). A power loss up to 12.46% is observed in Niamey after 21 days of dust accumulation.
Changes in Vegetation and Rainfall over West Africa during the Last Three Decades (1981-2010)  [PDF]
Adama Bamba, Bastien Dieppois, Abdourahamane Konaré, Thierry Pellarin, Ahmed Balogun, Nadine Dessay, Bamory Kamagaté, Issiaka Savané, Arona Diédhiou
Atmospheric and Climate Sciences (ACS) , 2015, DOI: 10.4236/acs.2015.54028
Abstract: The decadal variability of rainfall and vegetation over West Africa have been studied over the last three decades, 1981-1990, 1991-2000 and 2001-2010 denoted as 1980s, 1990s and 2000s, respectively. Climate Research Unit (CRU) monthly precipitation and Normalized Difference Vegetation Index (NDVI) from the National Oceanic and Atmosphere Administration (NOAA), all covering the period 1981-2010 have been used. This study aimed to assess the changes in the land surface condition and the spatio-temporal distribution of rainfall over West Africa region. The relationship between rainfall and vegetation indices over this region was determined using Pearson’s correlation. Also, the decadal comparison between rainfall and NDVI over the region was based on the significant t-test and the Pearson’s correlation. Results showed that significant return to wet conditions is observed between decade 1980s and decade 1990s over West Africa, and also during decade 2000s with the exception of central Benin and the western Nigeria. Meanwhile, a regreening of the central Sahel and Sudano-Sahel regions is noted. From 1990s to 2000s, this regreening belt is located in the South and the coastal areas: the Guinea Coast, Sudano-Guinea and western Sahel regions. A northward displacement of this re-greening belt is also detected. Thus, a linear relationship occurs between rainfall and NDVI in the Sudanian savannah region, but it is not the case in the rest of West Africa. This may suggest that the re-growth of vegetation in the Sudanian savannah region may be linked to rainfall supplies. Therefore, re-greening over Sahel region in 1990s is related to rainfall recovery. However, this re-greening was not sustained in the decade 2000s due to a slight decrease in rainfall.
Intercontinental Transport and Climatic Impact of Saharan and Sahelian Dust
N'Datchoh Evelyne Touré,Abdourahamane Konaré,Siélé Silué
Advances in Meteorology , 2012, DOI: 10.1155/2012/157020
Abstract: The Sahara and Sahel regions of Africa are important sources of dust particles into the atmosphere. Dust particles from these regions are transported over the Atlantic Ocean to the Eastern American Coasts. This transportation shows temporal and spatial variability and often reaches its peak during the boreal summer (June-July-August). The regional climate model (RegCM 4.0), containing a module of dust emission, transport, and deposition processes, is used in this study. Saharan and Sahelian dusts emissions, transports, and climatic impact on precipitations during the spring (March-April-May) and summer (June-July-August) were studied using this model. The results showed that the simulation were coherent with observations made by the MISR satellite and the AERONET ground stations, within the domain of Africa (Banizoumba, Cinzana, and M’Bour) and Ragged-point (Barbados Islands). The transport of dust particles was predominantly from North-East to South-West over the studied period (2005–2010). The seasonality of dust plumes’ trajectories was influenced by the altitudes reached by dusts in the troposphere. The impact of dusts on climate consisted of a cooling effect both during the boreal summer and spring over West Africa (except Southern-Guinea and Northern-Liberia), Central Africa, South-America, and Caribbean where increased precipitations were observed.
Intercontinental Transport and Climatic Impact of Saharan and Sahelian Dust
N'Datchoh Evelyne Touré,Abdourahamane Konaré,Siélé Silué
Advances in Meteorology , 2012, DOI: 10.1155/2012/157020
Abstract: The Sahara and Sahel regions of Africa are important sources of dust particles into the atmosphere. Dust particles from these regions are transported over the Atlantic Ocean to the Eastern American Coasts. This transportation shows temporal and spatial variability and often reaches its peak during the boreal summer (June-July-August). The regional climate model (RegCM 4.0), containing a module of dust emission, transport, and deposition processes, is used in this study. Saharan and Sahelian dusts emissions, transports, and climatic impact on precipitations during the spring (March-April-May) and summer (June-July-August) were studied using this model. The results showed that the simulation were coherent with observations made by the MISR satellite and the AERONET ground stations, within the domain of Africa (Banizoumba, Cinzana, and M’Bour) and Ragged-point (Barbados Islands). The transport of dust particles was predominantly from North-East to South-West over the studied period (2005–2010). The seasonality of dust plumes’ trajectories was influenced by the altitudes reached by dusts in the troposphere. The impact of dusts on climate consisted of a cooling effect both during the boreal summer and spring over West Africa (except Southern-Guinea and Northern-Liberia), Central Africa, South-America, and Caribbean where increased precipitations were observed. 1. Introduction Numerous studies have been focused on Sahelian climate variability contrary to the tropical humid African areas for which reliable data do not exist. Servat et al. [1] showed that the tropical humid belt has been similarly affected by series of climatic episodes in comparison with those observed in the Sahelian zone. In addition, this region has been subjected to significant environmental changes due to the increase of populations and strong exploitation of natural resources such as deforestation [2]. Furthermore, this region is particularly rich in aerosols from various origins leading to coexistence in the region of maritime, desert, urban, and bushfire aerosols. Besides, the plumes of desert and Sahelian dusts ejected into the atmosphere during emission episodes are an integral part of the West African climate system [3–5]. The greater part of mineral aerosols is emitted from arid and semiarid zones on the Earth where, these surfaces are less protected from erosion because of very limited or inexistent vegetative covers, and of very low soil humidity limiting the cohesion of constituent elements [5]. Thus, the Saharan-Sahelian region has been identified as the world’s first source of
Multicultural Education in USA: Place of Ethnic Minorities
DICKO Abdourahamane
Asian Social Science , 2010, DOI: 10.5539/ass.v6n12p36
Abstract: It has become more obviously about the trends of the United States public schools’s diversification and the trends have led to the “figure crisis” which calls out to the effective education of minority students. Consequently a new field named Multicultural Teacher Education has been constructed by combining education and multicultural education. As to pursure the multicultural teacher education’s balance between theory and practice, the essay illustrates the way of attachment methods, field experience, service learning and actuality, besides the principle of practice on the multi-cultural background.
Debate on the Multiculturalism: Issues and Particularism
DICKO Abdourahamane
Asian Social Science , 2010, DOI: 10.5539/ass.v7n1p32
Abstract: In its appearances and its contemporary manifestation, the challenges provoked by the thrust of cultural identities have up to half a century of history. Since the 60s, it unveiled the broad social fragility and the problem of coexistence between cultures in democratic countries. This challenge has shacked the dictatorial, the authoritarian regimes, in particular when it alludes to the religious organizations, or national liberation groups. And it taps well our countries, under the shape of religious, nationalist movements, either still fights which recover from what we call indigenism. Faced with this challenge, we cannot formulate summary hypotheses. We are not any more at the beginning phase made by unknowns: we are engaged deeply in conflicts, tensions and transformations which we know already are not ephemeral .It does not obviously mean that their expressions are stabilized, or that their senses are fixed to the long term. To bring knowledge and more clarity on the nature of the problems in cause and on the way they are envisage in the public debate. We suggest analyzing in what the multiculturalism is a solution of the identical crises. Produce knowledge on the cultural differences, their production, their transformation and their reproduction; examine the problems which they generate in the social life, the meanings which they dress for the interested and for others; report their difficulties and their internal tensions: all is within the competence of the sociological analysis and requires as such specific theoretical and methodological tools. To return our coherent and practical work we are going to support our reflection with a case study, at least comparative between several multiculturalists’ models in particular French, American, Canadian and British. This exercise will allow us to kick away hypotheses which will be used as runway to the scientific community and to all society in the grip of the identical crises. However, the elaboration of a theoretical frame of the multiculturalists question stays a preliminary tool. As mentioned theoretical frame elaboration will serve as support of reflection .It will allow us to seize better the notion of the multiculturalism .it will include three main trunk dimensions which are: the Definition of the multiculturalism, the management of the multiculturalism and the identical tensions connected to the vertical and horizontal inheritances. According to Amnesty International multiculturalism is defined as a policy to maintain and to value the various cultures and the communities living within a society.
Screening for Aphid Incidence on Some Potato Germplasm in Plains of West Bengal  [PDF]
Biplab Kahar, Amitava Konar
Agricultural Sciences (AS) , 2016, DOI: 10.4236/as.2016.76036
Abstract: A field trial was conducted to study the impact of various potato germplasm against aphids, Myzus persicae (Sulzer) and Aphis gossypii Glover (Aphididae: Hemiptera) during rabi season from November to March in 2012-2013 and 2013-2014, respectively at Adisaptagram Block Seed Farm, Hooghly, West Bengal. The population of aphids was started on potato crop in between third week of December and first week of January irrespective of various germplasms, except K. Chipsona-2, where its infestation was initiated during second and third week of January. Then, their population was gradually increased to reach its critical level (ETL) during first and second week of January in most of the potato germplasm, except in K. Anand, K. Chipsona-1, K. Chipsona-2 and Sailaja, where it was crossed in between fourth week of January and first week of February. The peak population of aphids was observed during third and fourth week of February in most of the potato germplasm. It was observed that K. Ashoka, K. Badshah, K. Chandramukhi, K. Jawahar, K. Jyoti and K. Pukhraj were highly susceptible to the pests, while K. Anand and K. Sutlez were moderately susceptible but K. Chipsona-1 , K. Chipsona-2 and K. Sailaja were less susceptible or tolerant to the pests. Maximum tuber yield (t/ha) of potato was recorded in K. Badshah (36.58 - 43.92) while it was lowest in K. Chandramukhi (22.08 - 22.12).
Juvenile Justice as a Part of Child and Adolescent Care
Devashish Konar
Journal of Indian Association for Child and Adolescent Mental Health , 2005,
Abstract: Juvenile justice has been given some shape with Juvenile Justice Act 2000 AD. Persons dealing withchildren need to sensitize themselves with this Act. One needs to know the provisions made, tounderstand whether it is being properly implemented. Only on observing it being implemented, can oneget insight into the problems inherent in it, and if one knows the problems, one can suggestimprovements in the Act. Even if the law gives adequate guidelines, institutions are still needed to lookafter the children in distress or children in conflict with law. For successful compliance of Court orders,and to punish violators, monitoring bodies need to be set up, who should be given legal powers as well.Effective child protection and development depends on skills, knowledge and judgment of allprofessionals, personnel and staff working with children.
The Magnetar Fields
Sushan Konar
Physics , 2003,
Abstract: We discuss the nature of evolution of the magnetic field in Magnetars.
Of Neutrinos and Magnetars
Sushan Konar
Physics , 2003,
Abstract: We discuss the nature of neutrino propagation in the presence of strong magnetic fields of Magnetars.
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