African Journal of
Environmental Science and Technology

  • Abbreviation: Afr. J. Environ. Sci. Technol.
  • Language: English
  • ISSN: 1996-0786
  • DOI: 10.5897/AJEST
  • Start Year: 2007
  • Published Articles: 937

Table of Content: December 2018; 12(12)

December 2018

Study of the reactivity of Casamance vegetable and agricultural waste char gasification with steam and CO2

The increasing energy demand coupled with the need to reduce greenhouse gas emissions and the threat of exhaustion of oil reserves make us consider a possible recourse to the use of biomass waste as a source of renewable energy. Nowadays, gasification is not yet economically and operationally attractive for the power industry and more research is needed to facilitate the process and improve the desirability of the...

Author(s): Ansoumane DIEDHIOU, Lat-Grand NDIAYE, Ammar BENSAKHRIA and Oumar SOCK

December 2018

Valorization of water resources in Senegal for economic, social and sustainable development

Senegal has a rich and diversified hydrological potential. The bulk of surface water reserves are located in the basin's rivers Senegal and Gambia, whose waters originate from the Fouta Djallon massif. Alongside these large rivers, there are smaller rivers (Casamance and Kayanga) and small watersheds with temporary flows. Groundwater resources are also an important part of Senegal's...

Author(s): Cheikh Faye and Sidy Dieye

December 2018

Comparative experimental study of performance degradation of amorphous silicon and crystalline silicon in outdoor exposed in Cologne

The photovoltaic (PV) lifetime and the return-on-investment for local PV system installation rely on long-term device performance. Understanding the efficient degradation behavior under a given set of environmental conditions is, therefore, a primary goal for experimental research and economic analysis. The modules were characterized with measurement of their I-V features under similar outdoor condition. Moreover,...

Author(s): I. Faye, A. Ndiaye, D. Kobor, U. Blieske and M. Ayituv

December 2018

Modeling ensemble streamflow: Application to the Senegal River upper the Manantali Dam

This study presents an ensemble stream flow simulation with probability of occurrence accounting for errors of the GR4J turned to the Senegal River upper the Manantali dam. Through this approach, probability is associated to simulation at each time, with step and reliability of issues depending on probability scores. Results including the reliability of the results permit decision-makers to judge the reliability of...

Author(s): Ndione D. M., Sambou S., Sane M. L., Kane S., Leye I., Tamba S., Diedhiou R., Cisse M. T. and Ngom I.  

December 2018

Physicochemical and mechanical properties of biomass coal briquettes produced by artisanal method

In this study, carbonized peanut shells, cashew shells and millet stalks were used as raw materials to produce coal briquettes. Clay and arabic gum were applied as binders during briquetting by use of manual press. Physicochemical and mechanical tests of the obtained briquettes were conducted. The results show that the lower heating values of coal briquettes remain higher to that of wood; however, their ash contents are...

Author(s): Philippe Bernard Himbane, Lat Grand Ndiaye, Alfredo Napoli and Diouma Kobor  

December 2018

A numerical modeling study of the Southern Senegal upwelling shelf: Circulation and upwelling source waters

The regional ocean circulation along the Southern Senegal shelf is studied using a numerical model for varying forcing fields during the upwelling season (November-May). The main objective is to study the shelf circulation of the marine environment in the Southern Senegal Upwelling Shelf (SSUS), the Lagrangian pathways by which waters are transported to the surface in the upwelling tongue and the fate of these waters....

Author(s): S. Ndoye, X. Capet, P. Estrade, E. Machu, L. Kounta, B. Sow, M. Diakhaté and A. T. Gaye

December 2018

Assessment of satellite rainfall products for stream flow simulation in Gambia watershed

Satellite rainfall estimates (SRE) with high spatial and temporal resolution and large areal coverage provide a potential alternative source to force hydrological models within regions where ground-based measurements are not readily available. The Gambia Basin in West Africa provides a good example of a case where the use of satellite precipitation estimates could be beneficial. This study aims to compare three SRE over...

Author(s): Bakary FATY, Abdou ALI, Honoré DACOSTA, Ansoumana BODIAN, Salif DIOP and Luc DESCROIX  

December 2018

Variability and predictability of bush fire in Guinea on inter-annual and multi-year timescales based on NDVI-MODIS datasets analysis

This study investigates the variability and the predictability of bush fire on inter-annual and multi-year timescales in Guinea (latitudes 7° 05 and 12° 51 N and longitudes 7° 30 and 15° 10 W). Using Moderate Resolution Imaging Spectroradiometer (MODIS) with a spatial resolution of 231 m × 231 m and 16 days composite temporal resolution between 2001 and 2016, two brush fire hazard indices are...

Author(s): M. B. Barry, D. Badiane, M. Diakhaté, S. M. Sall, H. Senghor and T. N. Millimono,  

December 2018

Module parameter extraction and simulation with LTSpice software model in sub-Saharan outdoor conditions

In this work, a hybrid algorithm of Levenberg-Marquardt and empiric analytic method is proposed to solve the recurring convergence problem that occurs during the module parameters extraction with the iterative method. The proposed method aims to avoid divergence and a long computation time due to the improper initial value. Elsewhere, LTSpice photovoltaic cell model is developed to simulate the extracted parameters in...

Author(s): N’Detigma Kata, Djicknoum Diouf, Y. M. Soro, Arouna Darga and Amadou Seidou Maiga

December 2018

Study by numerical simulation of a PN solar cell in 3C-SiC / Si

The optimization of the solar cell includes the study of the influence of parameters such as cell thickness, doping levels and profiles, contact configuration and optical confinement on the output to obtain a structure leading to the best performance. The optimal parameters depend on the structure of the solar cell, the quality of the substrate material (lifetime, mobility), the quality of the ohmic contacts, the speed...

Author(s): M. Toure, B. Berenguier, D. Kobor, L. Ottaviani and M. Pasquinelli