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Search Results: 1 - 10 of 20743 matches for " Jean Nganhou "
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Technical and Economic Feasibility Studies of a Micro Hydropower Plant in Cameroon for a Sustainable Development  [PDF]
Kengne Signe Elie Bertrand, Oumarou Hamandjoda, Jean Nganhou, Laure Wegang
Journal of Power and Energy Engineering (JPEE) , 2017, DOI: 10.4236/jpee.2017.59006
Abstract: All serious projects over the world should respect the objectives of sustainable development. The contribution of every country against the climate change is request applied. The development of renewable energies is an effective contribution to solutions for this relevant question. Hydropower energy is one of most promising clean energy technologies. However, Micro Hydro Power Plants (MHPP) will be more promising than large hydro power stations. Cameroon has a great hydroelectric potential, but the access rate to electricity is still very low in rural areas of this country. The objective of this work is to do the technical and economic assessment of a MHPP in BAKASSA, which is a remote village in the West Region of Cameroon, in the intention to contribute to its sustainable development. The results of this study show that this MHPP project can be developed with installed power of 97 kW, where the Francis turbine is recommended. The investment cost evaluated at 88,440,068 FCFA. It is a profitable project with a maximum payback period of 9 years.
Physicochemical and Thermal Characterization of Dura Palm Kernel Powder as a Load for Polymers: Case of Polyvinyl Chloride  [PDF]
Rolland Djomi, Lucien Jean Raymond Meva’a, Jean Nganhou, Gérard Mbobda, Abel Emmanuel Njom, Yves Didier Modtegue Bampel, Jean-Bosco Saha Tchinda
Journal of Materials Science and Chemical Engineering (MSCE) , 2018, DOI: 10.4236/msce.2018.66001
Abstract: This work presents the physical and thermal characterization of the dura palm kernel powder of Cameroon for their use as fillers for polymers composites. The powders of palm kernel were obtained using a percussion grinder mill with an industrial microniser which allowed obtaining a powder less than 50 μm with an apparent density between 0,505 ≤ ρ ≤ 0,680 g/cm3 at 1.56 of relative humidity. The infrared of the powder of palm kernel shows the presence of phenols groups with a large band around 3341 cm-1, -C-H at 2917.02 cm-1 and -C-O at 1040 cm-1 as the main peaks. The polyvinyl chloride of infrared obtained shows the presence of -C-Cl, -CH2 and CH as the mains peaks. The infrared of 12.5% of palm kernel powder with polyvinyl chloride shows an increase of the CH2 and CH bonds and a decrease of the -OH bonds. Thermogravimetric analysis and differential scanning calorimetric analysis of powders, polyvinyl chloride and mixture showed that the mixing powders are intermediate between the polyvinyl chloride and palm kernel powder. The powder decreased the phase temperatures of the mixture from 98.58 to 95 for the glass transition temperature and from 515℃ to 459 for the crystallization temperature. The thermogravimetric curves of palm kernel powder and polyvinyl chloride have showed that these materials lose their different masses in three different phases, and the one of composite (mixture of polyvinyl chloride with 12.5% of palm kernel powder) in two different phases.
Modeling the wait time of a hierarchical system: Case study of an Internal Medicine unit
International Journal of Engineering and Technology , 2011,
Abstract: All, such as industrial production (Manufacturing companies), health units are hierarchical at the level of organization. This arrangement permits them to response efficiently to an event in occurrence, such as a patient whom appropriate care has to be dispensed. The quick reaction of the medical unit when faced with a problem is not only an indicator of its reactivity, but also an indicator of its performance.In this article, we propose to model the reaction of a medical unit in relationship to parameters, notably the reference periods of the different levels at which decisions are made. We define and express subsequently, the wait times which is a source of delay in the treatment process of a patient from when he arrives. Then, we propose an algorithm which minimizes the wait time.
Description concise et analyse des systèmes utilisés dans la région Sud du Cameroun pour le séchage du cacao
Kanmogne, A.,Jannot, Y.,Nganhou, J.
Tropicultura , 2012,
Abstract: A Concise Description and Analysis of Methods Used for Cocoa Drying in the South Region of Cameroon. An inventory of drying methods and types of cocoa dryers used by farmers in rural zone of South Cameroon was made. These include direct solar drying which is predominant and thermal drying using energy from burning wood. Different types of dryers are associated with each of these drying methods. These consist of "autobus" dryer in south zone, dryer on cemented area in center zone, firewood dryer in south -west zone and ground dryer used in the South Region of Cameroon. An analysis of real needs in drying in the rural zone and an appraisal of available means to accomplish them were done using an investigation carried out among rural farmers. Cocoa conservation is very difficult because climatic condition is unfavorable during production. Local unit of measurement, which is bag, weighs about 50 to 80 kilograms. Cocoa buying price from the producer is very high at the end of production. Mean duration of fermentation is 7 days. A laboratory determination of water content in dry base of cocoa samples used during the investigation shows that it varies from 10 to 20% instead of the 8%, which is the recommended water content. The range of water content found shows that drying is inadequate.
Integrated Optimization of Mechanisms with Genetic Algorithms  [PDF]
Jean-Luc Marcelin
Engineering (ENG) , 2010, DOI: 10.4236/eng.2010.26057
Abstract: This paper offers an integrated optimization of mechanisms with genetic algorithm, the principle of which is to use a neural network as a global calculation program and to couple the network with stochastic methods of optimization. In other words, this paper deals with the integrated optimization of mechanisms with genetic algorithms, and, in conclusion, the possible use of neural networks for complex mechanisms or processes.
Extremely Early Diagnostic Test for Prostate Cancer  [PDF]
Veronica Jean James
Journal of Cancer Therapy (JCT) , 2011, DOI: 10.4236/jct.2011.23051
Abstract: Purpose: This article reports the results of a blinded fibre diffraction study of skin samples taken from TRAMP mice and age-matched controls to determine whether changes noted in fibre diffraction studies of human skin were present in these TRAMP mice studies. These mice are bred to progress to Gleeson Type 3 to Type 5 prostate cancer. Methods: Small strips, 1 mm × 5 mm, cut from the mouse skin samples were loaded into cells in the same way as human samples and slightly stretched to remove the crimp. They remained fully hydrated throughout exposure to the synchrotron beam. Results: The added change that was reported for prostate cancer in 2009 was obtained for all TRAMP mice samples, indicating that this change can be read as High Grade Cancer in human diagnostic tests. Discussion: These changes were evident for all 3 and 7 week old TRAMP mice samples but not for any of the control samples. This indicates that the changes in the fibre diffraction patterns appear much earlier than in any other available prostate cancer diagnostic test, as none of these can verify the presence of prostate cancer in the TRAMP mice before 10 weeks of age. The fibre diffraction test is therefore the most accurate and earliest test for high grade prostate cancer.
LeChatelier Principle and the Effects of Trade Policy under Induced Innovation  [PDF]
Jean-Paul Chavas
Theoretical Economics Letters (TEL) , 2012, DOI: 10.4236/tel.2012.23044
Abstract: This paper explores the effects of trade policy under induced innovation in general equilibrium. The analysis considers the effects of discrete changes in tariffs and import quotas, allowing for heterogeneous technologies among firms. The interactions between induced innovation and the effects of trade policy give a set of “LeChatelier effects” comparing short run versus long run market equilibrium. We investigate how induced innovation can reduce the adverse effects of tariffs on trade, and influence the effects of quotas on corresponding quota rents. The analysis presents new LeChatelier results that apply globally, i.e. under any discrete change in trade policy.
Is Dark Matter Made up of Xons?  [PDF]
Jean-Paul Auffray
Journal of Modern Physics (JMP) , 2013, DOI: 10.4236/jmp.2013.48A011

Three months before his untimely death in Paris in July 1912, Henri Poincaré formulated the conjecture that Planck’s action element could (should) be regarded as constituting a “véritable atome”, i.e. an “atom of motion”, whose integrity arises from the fact that the “points” it contains are equivalent to one another from the standpoint of probability. In this paper we investigate the possibility that this conjecture provides a clue to the origin and nature of dark matter.

Improving Municipal Solid Waste Land Filling Disposal Process: Experiments with a Laboratory Scale Rotary Kiln  [PDF]
Jean Fidèle Nzihou
Journal of Environmental Protection (JEP) , 2013, DOI: 10.4236/jep.2013.48087

Developing countries often face the challenge of managing continuously growing quantity of municipal waste. Waste is often disposed of by stockpiling and land filling because these have been found the cheapest waste disposal methods in the world. Unfortunately, these waste disposal methods are often source of visual pollution, water contamination and greenhouse effect gas emissions. Waste disposal by incineration has been found effective and now is one of the mostly used waste disposal method in several developed countries. Nevertheless, setting up appropriate waste incinerator requires a good of the combustion process. Unfortunately, direct studies on industrial facilities are not easily feasible because of technical issues and financial limitations. Studies and throughout testing frequently need to be carried out at laboratory scale. Work herein reported first overviewed operation conditions of the landfill facility in the town of Ouagadougou. In the second time for incineration simulation, batch experiments are carried out with a rotary kiln furnace to study the effects of the residence time on emissions of NO, NO2, CO, CO2 and SO2 in the atmosphere. For each rotation speed, emissions of NO, NO2, CO, CO2 and SO2 from the incineration of a household combustible fraction model waste consisting of wood (53%), cardboard (25%) and plastics (22%) have been recorded. The lifespan of the land filling facility with incineration has been estimated. Our work show that it may be improved up to roughly three times that of simple land filling. Visual pollution maybe drastically reduced and atmospheric pollution reduced

Pulse Soliton Solutions of the Modified KdV and Born-Infeld Equations  [PDF]
Jean Roger Bogning
International Journal of Modern Nonlinear Theory and Application (IJMNTA) , 2013, DOI: 10.4236/ijmnta.2013.22017

In this work, we use the Bogning-Djeumen Tchaho-Kofané method to look for all solutions of shape Sechn- of the modified KdV and Born-Infeld Equations. n being a real number, we obtain the soliton solutions when n is positive and the non soliton solutions when n is negative.

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