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Douala, Cameroon

University of Douala, or Université de Douala , is located in Douala in Cameroon. It was founded in 1977. The University of Douala is one of the six public universities of Cameroon.The current structure of the University of Douala was established in 1993. The university incorporated the previous University Centre which was made of the Ecole Supérieure des science Economiques et Commerciales and the Ecole Normale d'Enseignement Technique and which was transformed into a university in 1992.The university has around 40.000 students, 600 teachers and around 600 administrators and collaborators.The University of Douala has six locations in different neighborhoods of the city of Douala: Campus Bassa "Cité SIC" where the main campus is located. Campus Ndogbong Campus Akwa Nkongsamba Yabassi Logbessou The university provides training in economics and commerce, technical training, industrial engineering, medicine and pharmaceutics, arts, fisheries science, humanities, law and politics, science, economic science and management.The university is partner of the AUF Agence Universitaire de la Francophonie, AUA Association des Universités Africaines , AIUAssociation Internationale des Universités , ACU the Association of Commonwealth Universities, AIEA Agence Internationale de l'Energie Atomique , CAMES Conseil Africain et Malgache pour l'Enseignement Supérieur , UNESCO the United Nations of Education, Science and Cultural Organisation and CRUROR/AC Conférence des Recteurs des Universités et des Responsables des Organismes de Recherche d'Afrique Centrale . Wikipedia.

Koumi Ngoh S.,University of Douala | Koumi Ngoh S.,University of Yaounde I | Njomo D.,University of Yaounde I
Renewable and Sustainable Energy Reviews

Hydrogen production plays a very important role in the development of hydrogen economy. Hydrogen gas production through solar energy which is abundant, clean and renewable is one of the promising hydrogen production approaches. This article overviews the available technologies for hydrogen generation using solar energy as main source. Photochemical, electrochemical and thermochemical processes for producing hydrogen with solar energy are analyzed from a technological environmental and economical point of view. It is concluded that developments of improved processes for hydrogen production via solar resource are likely to continue in order to reach competitive hydrogen production costs. Hybrid thermochemical processes where hydrocarbons are exclusively used as chemical reactants for the production of syngas and the concentrated solar radiation is used as a heat source represent one of the most promising alternatives: they combine conventional and renewable energy representing a proper transition towards a solar hydrogen economy. © 2012 Elsevier Ltd. Source

Ndjigui P.-D.,University of Yaounde I | Bilong P.,University of Douala
Journal of Geochemical Exploration

The behaviour of PGE in a rainforest ecosystem were investigated in four lateritic profiles (Nkamouna, Napene, West and East Mada) developed on serpentinites in the Kongo-Nkamouna massif (Lomié region, South-East Cameroon). In serpentinites, the total PGE content attains 22ppb whilst it ranges between 26 and 200ppb in the weathering blanket. Amongst the analyzed elements (platinum, iridium, ruthenium, rhodium, palladium), platinum and ruthenium contents are high in the saprolite zone and in the hardened materials of some weathering profiles (40-66ppb for platinum, 50-71ppb for ruthenium). Apart from the hardened materials, the total PGE content decreases from the coarse saprolite towards the clayey surface soil. The Fe2O3-PGE diagram indicates a relatively similar behaviour in these iron-rich samples. The Pt-Ir, Pt-Pd, Pt-Ru, Pt-Rh diagrams portray positive correlations between platinum and other PGE. This fact is supported by the positive correlation noticed between IPGE and PPGE. The Pt/Ir, Pt/Pd, Pt/Ru and Pt/Rh values indicate that iridium, palladium, ruthenium and rhodium are more mobile than platinum. These data confirm the mobility of PGE in laterites and the positive correlation reveals that PGE might be accommodated in the interfaces of iron oxides. The mass balance assessment shows that PGE are strongly leached from the Kongo-Nkamouna weathering blanket except in the coarse saprolite of the Nkamouna profile. © 2010 Elsevier B.V. Source

Silenou Mengoue M.,University of Douala
Physical Review A - Atomic, Molecular, and Optical Physics

We present an approach associated with the Jacobi matrix method to calculate a three-body wave function that describes the double continuum of an atomic two-electron system. In this approach, a symmetrized product of two Coulomb waves is used to describe the asymptotic wave function, while a smooth cutoff function is introduced to the dielectronic potential that enters its integral part in order to have a compact kernel of the corresponding Lippmann-Schwinger-type equation to be solved. As an application, the integral equation for the (e-,e-,He2+) system is solved numerically; the fully fivefold differential cross sections (FDCSs) for (e,3e) processes in helium are presented within the first-order Born approximation. The calculation is performed for a coplanar geometry in which the incident electron is fast (∼6 keV) and for a symmetric energy sharing between both slow ejected electrons at excess energy of 20 eV. The experimental and theoretical FDCSs agree satisfactorily both in shape and in magnitude. Full convergence in terms of the basis size is reached and presented. © 2013 American Physical Society. Source

Bowong S.,University of Douala
Nonlinear Dynamics

This paper deals with the problem of optimal control for the transmission dynamics of tuberculosis (TB). A tuberculosis model which incorporates the essential biological and epidemiological features of the disease such as exogenous reinfection and chemoprophylaxis of latently infected individuals, and treatment of the infectious is developed and rigorously analyzed. Based on this continuous model, the tuberculosis control is formulated and solved as an optimal control theory problem, indicating how a control term on the chemoprophylaxis should be introduced in the population to reduce the number of individuals with active TB. The feedback control law has been proved to be capable of reducing the number of individuals with active TB. An advantage is that the proposed scheme accounts for the energy wasted by the controller and the closed-loop performance on tracking. Numerical results show the performance of the optimization strategy. © 2010 Springer Science+Business Media B.V. Source

Godet J.,University of Strasbourg | Kenfack C.,University of Strasbourg | Kenfack C.,University of Douala | Przybilla F.,University of Strasbourg | And 3 more authors.
Nucleic Acids Research

The HIV-1 nucleocapsid protein (NCp7) is a nucleic acid chaperone required during reverse transcription. During the first strand transfer, NCp7 is thought to destabilize cTAR, the (-)DNA copy of the TAR RNA hairpin, and subsequently direct the TAR/cTAR annealing through the zipping of their destabilized stem ends. To further characterize the destabilizing activity of NCp7, we locally probe the structure and dynamics of cTAR by steady-state and time resolved fluorescence spectroscopy. NC(11-55), a truncated NCp7 version corresponding to its zinc-finger domain, was found to bind all over the sequence and to preferentially destabilize the penultimate double-stranded segment in the lower part of the cTAR stem. This destabilization is achieved through zinc-finger-dependent binding of NC to the G10 and G50 residues. Sequence comparison further revealed that C A mismatches close to the two G residues were critical for fine tuning the stability of the lower part of the cTAR stem and conferring to G10 and G50 the appropriate mobility and accessibility for specific recognition by NC. Our data also highlight the necessary plasticity of NCp7 to adapt to the sequence and structure variability of cTAR to chaperone its annealing with TAR through a specific pathway. © 2013 The Author(s). Source

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