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Bobo-Dioulasso, Burkina Faso

Millogo Y.,Bobo-Dioulasso Polytechnic University | Millogo Y.,University of Lyon | Millogo Y.,University of Ouagadougou | Morel J.-C.,University of Lyon
Materials and Structures/Materiaux et Constructions | Year: 2012

Microstructures of adobes, manufactured with clayey soil containing an important amount of quartz and stabilised with cement up to 12% by weight, were investigated with X-ray diffraction, infrared spectrometry, differential thermal analysis, scanning electron microscopy and energy dispersive spectrometry. The water absorption and mechanical (compressive and flexure strengths) characteristics of specimens elaborated with these mixtures were also measured. Cement additions resulted in the formation of calcium silicate hydrate (CSH) type tobermorite, portlandite, ettringite, iron oxyhydroxide and calcite. The CSH was formed through the hydration of anhydrous cement compounds (alite and belite). The formation of CSH through pozzolanic reaction, requiring kaolinite (unique clay minerals) and tiny quartz (obtained with the same material mixed of quicklime) is negligible. Moreover, CSH marked crystallisation with curing time contributed to the improvement of mechanical properties. The cement stabilised adobes comprised of 4-12% by weight cement, immersed for 4 days, were still suitable as building materials according to the required standards. This study concludes that for cement stabilised adobes, clayey soils containing an important amount of quartz were suitable soils for manufacturing resistant and durable adobes. © 2012 RILEM. Source

Ouedraogo A.,Bobo-Dioulasso Polytechnic University
International Journal of Dynamical Systems and Differential Equations | Year: 2016

Our purpose is to explicit the assumptions of a technical and fundamental lemma which has been used in many works as a main tool to get the uniqueness of solutions for some nonlinear and degenerate parabolic problems. In our investigation, we hope to generalise this result in a class of Hölder convection-diffusion functions. We also complete and validate the previous works by proving that the class of functions satisfying these hypotheses is not empty. Copyright © 2016 Inderscience Enterprises Ltd. Source

Millogo V.,Swedish University of Agricultural Sciences | Svennersten Sjaunja K.,Swedish University of Agricultural Sciences | Ouedraogo G.A.,Bobo-Dioulasso Polytechnic University | Agenas S.,Swedish University of Agricultural Sciences
Food Control | Year: 2010

The aim of this study was to investigate raw milk hygiene and composition along the dairy chain in Burkina Faso. Milk samples were taken during the rainy and dry seasons from individual cows, farm tanks, milk collectors' churns, dairy processing unit tanks and at local markets. The results showed lower total bacteria count (10-104 cfu/ml) in individual cow milk than later in the dairy chain. The total bacteria count in farm tank milk was 106 cfu/ml and 107 cfu/ml in tank milk at dairy processing units, in milk collectors' churns and in market buckets. Somatic cell count (100,000-150,000 cells/ml) did not show significant variation between individual cow milk and in the rest of the chain. Higher pH and lower milk fat and lactose contents were found in market bucket milk than in farm and processing unit tank milks. It was concluded that milk from the cow is of good hygienic quality, but milk is often contaminated after milking, and the hygienic quality is very low when it reaches the consumers. Also, milk sold at local markets had low fat and lactose contents and high pH during the rainy season, indicating that the milk may have been diluted, which may further increase the hazards for human health. © 2010 Elsevier Ltd. All rights reserved. Source

Huynen P.,University of Liege | Mauroy A.,University of Liege | Martin C.,Pasteur Institute of Bangui | Savadogo L.G.B.,Bobo-Dioulasso Polytechnic University | And 4 more authors.
Journal of Clinical Virology | Year: 2013

Background: Noroviruses (NoV) are a leading cause of gastroenteritis worldwide. Few epidemiological data regarding the NoV strains circulating in African countries are available. Objectives: To determine the prevalence of NoV in Bobo Dioulasso (Burkina Faso) in both symptomatic and asymptomatic gastroenteritis patients. Study design: Patients both with and without gastro-intestinal disorders were selected. Clinical and epidemiological data, as well as stool samples, were collected through March to April 2011.NoV molecular detection (genogrouping and genotyping) and viral load quantification were also performed for all samples. Results: NoV were detected in 22.2% of the 418 collected stool samples (21.2% and 24.8% from the 293 symptomatic patients (SP) and the 125 asymptomatic patients (ASP) respectively).Genogroup (G) distribution was 7.5%, 10.2% and 3.4% for GI, GII and both GI/GII respectively among SP and 12.0%, 11.2% and 1.6% for GI, GII and both GI/GII, respectively, among ASP.Average viral load values were higher in SP than in ASP for GI ( p=0.03) but not for GII.Phylogenic analysis showed a high degree of genotype diversity in SP and ASP. One recombinant GII.7/GII.6 sequence was, to the best of our knowledge, detected for the first time. Conclusions: This study enabled identification of the specific molecular epidemiology of NoV strains circulating in a representative country in Eastern Africa, and additionally showed that ASP could play an important "reservoir" role. A high strain diversity was detected with a surprisingly high proportion of NoV GI compared to the common genotypes usually reported in comparable epidemiological studies. © 2013 Elsevier B.V. Source

Tiendrebeogo T.,Bobo-Dioulasso Polytechnic University
Lecture Notes of the Institute for Computer Sciences, Social-Informatics and Telecommunications Engineering, LNICST | Year: 2016

Cloud computing technologies have attracted considerable interest in recent years. Thus, these latters became inescapable in most part of the developments of applications. It constitutes a new mode of use and of offer of IT resources in general. Such resources can be used “on demand” by anybody who has access to the internet. Cloud architecture allows today to provide a number of services to the software and database developers among others remote. But for most of the existing systems, the quality of service in term of services’ indexation is not present. Efforts are to be noted as for the search for the performance on the subject. In this paper, we define a new cloud computing architecture based on a Distributed Hash Table (DHT) and design a prototype system. Next, we perform and evaluate our cloud computing indexing structure based on a hyperbolic tree using virtual coordinates taken in the hyperbolic plane. We show through our experimental results that we compare with others clouds systems to show our solution ensures consistence and scalability for Cloud platform. © ICST Institute for Computer Sciences, Social Informatics and Telecommunications Engineering 2016. Source

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