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Search Results: 1 - 10 of 21103 matches for " Teguia Jean-Blaise "
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PC-Based Instrumentation System for the Study of Bean Cooking Kinetic
Bitjoka Laurent,Teguia Jean-Blaise,M.F. Mbofung Carl
Journal of Applied Sciences , 2008,
Abstract: The aim of this study was to design and develop an electronic device, which allows the follow up of the complete cooking kinetic of bean and could be used to efficiently measure hard to cock (HTC). A prototype device composed of a modified Mattson bean cooker, interfaced with a computer via displacement sensors and a 4-channel, 8 bits, 1 Hz data acquisition module built around the MIC 640 was achieved. Cooking data obtained with this device shown that the beginning and the end of the cooking period separated a transition region portraying an exponential rise characterized by a time constant, which varies for freshly harvested beans (3 sec) as opposed to that of long stored beans (10 sec). This time constant, identified and measured for the first time, could be used to elaborate an index of the degree of hardening that has taken place in a given sample of beans.
Logique Naturelle et Représentations Sociales
Grize, Jean-Blaise
Papers on Social Representations , 1993,
A propos de l'article de M. Fournier, M.-N. Schurmans et P. R. Dasen
Grize, Jean-Blaise
Papers on Social Representations , 1994,
Optical investigation of thermoelectric topological crystalline insulator Pb$_{0.77}$Sn$_{0.23}$Se
Anjan A. Reijnders,Jason Hamilton,Vivian Britto,Jean-Blaise Brubach,Pascale Roy,Quinn D. Gibson,R. J. Cava,K. S. Burch
Physics , 2014, DOI: 10.1103/PhysRevB.90.235144
Abstract: Pb$_{0.77}$Sn$_{0.23}$Se is a novel alloy of two promising thermoelectric materials PbSe and SnSe that exhibits a temperature dependent band inversion below 300 K. Recent work has shown that this band inversion also coincides with a trivial to nontrivial topological phase transition. To understand how the properties critical to thermoelectric efficiency are affected by the band inversion, we measured the broadband optical response of Pb$_{0.77}$Sn$_{0.23}$Se as a function of temperature. We find clear optical evidence of the band inversion at $160\pm15$ K, and use the extended Drude model to accurately determine a $T^{3/2}$ dependence of the bulk carrier lifetime, associated with electron-acoustic phonon scattering. Due to the high bulk carrier doping level, no discriminating signatures of the topological surface states are found, although their presence cannot be excluded from our data.
Magneto- to electro-active transmutation of spin waves in ErMnO3
Laura Chaix,Sophie De Brion,Sylvain Petit,Rafik Ballou,Louis-Pierre Regnault,Jacques Ollivier,Jean-Blaise Brubach,Pascale Roy,Jér?me Debray,Pascal Lejay,Andres Cano,Eric Ressouche,Virginie Simonet
Physics , 2014, DOI: 10.1103/PhysRevLett.112.137201
Abstract: The low energy dynamical properties of the multiferroic hexagonal perovskite ErMnO3 have been studied by inelastic neutron scattering as well as terahertz and far infrared spectroscopies on synchrotron source. From these complementary techniques, we have determined the magnon and crystal field spectra and identified a zone center magnon only excitable by the electric field of an electromagnetic wave. Using comparison with the isostructural YMnO3 compound and crystal field calculations, we propose that this dynamical magnetoelectric process is due to the hybridization of a magnon with an electro-active crystal field transition.
THz Magneto-electric atomic rotations in the chiral compound Ba$_3$NbFe$_3$Si$_2$O$_{14}$
Laura Chaix,Sophie De Brion,Florence Levy-Bertrand,Virginie Simonet,Rafik Ballou,Benjamin Canals,Pascal Lejay,Jean-Blaise Brubach,Ga?lle Greff,Fabrice Willaert,Pascale Roy,Andres Cano
Physics , 2013, DOI: 10.1103/PhysRevLett.110.157208
Abstract: We have determined the terahertz spectrum of the chiral langasite Ba$_3$NbFe$_3$Si$_2$O$_{14}$ by means of synchrotron-radiation measurements. Two excitations are revealed that are shown to have a different nature. The first one, purely magnetic, is observed at low temperature in the magnetically ordered phase and is assigned to a magnon. The second one persits far into the paramagnetic phase and exhibits both an electric and a magnetic activity at slightly different energies. This magnetoelectric excitation is interpreted in terms of atomic rotations and requires a helical electric polarization.
Influence of Anthropogenic Activities of Groundwater from Hand Dug Wells within the Precarious Settlements of Southern Abidjan, Côte d’Ivoire: Case of the Slums of Anoumabo (Marcory) and Adjouffou (Port-Bouët)  [PDF]
Isimemen Osemwegie, Yéi Mairie-Solange Oga, Kouassi Ernest Ahoussi, Yao Blaise Koffi, Amani Michel Kouassi, Jean Biémi
Journal of Water Resource and Protection (JWARP) , 2013, DOI: 10.4236/jwarp.2013.54042

This study aims to examine the quality and quantity of the groundwater resources from hand-dug wells, within two of these slums—Anoumabo (Marcory) and Adjouffou (Port-Bouet), both located in the southern part of the city. Twenty-eight representative groundwater samples were collected from different domestic wells within the study area. In addition, water samples were collected from the adjoining surface water bodies—the ébrié lagoon and the Atlantic Ocean. The water samples were also tested for microbial indicators of fecal contamination using the conventional membrane filtration method. The groundwater samples are alkaline to acidic with pH ranging between 4.4 and 8.1. They are slightly mineralized with electrical conductivity, EC values ranging between 388 μS/cm and 1494 μS/cm. The dominant hydrochemical facies are Na-Cl, Na-SO4, Ca-Cl and Ca-SO4. Although, majority of the water samples have anions and cations concentrations conforming to the World Health Organization, alerting levels of nitrate contamination was recorded in the area. About 67 percent of the tested samples have nitrate values greater than the recommended WHO limit for drinking water (NO3 > 50 mg/ι). Exceeding high nitrate concentrations in drinking water have been medically proven to be detrimental to infant health. Microbial analyses reveal bacterial contamination at varying degrees in all of the water wells. The presence of these microbial organisms in the samples is also indicative of the presence of some other disease causing pathogens, responsible for sicknesses like cholera, diarrhea, typhoid, etc. The water wells located within Anoumabo have relatively higher levels of groundwater contaminants in comparison to those located

Assessment of Aflatoxin Contamination of Maize, Peanut Meal and Poultry Feed Mixtures from Different Agroecological Zones in Cameroon
Jean Rapha?l Kana,Benoit Gbemenou Joselin Gnonlonfin,Jagger Harvey,James Wainaina,Immaculate Wanjuki,Robert A. Skilton,Alexis Teguia
Toxins , 2013, DOI: 10.3390/toxins5050884
Abstract: Mycotoxins affect poultry production by being present in the feed and directly causing a negative impact on bird performance. Carry-over rates of mycotoxins in animal products are, in general, small (except for aflatoxins in milk and eggs) therefore representing a small source of mycotoxins for humans. Mycotoxins present directly in human food represent a much higher risk. The contamination of poultry feed by aflatoxins was determined as a first assessment of this risk in Cameroon. A total of 201 samples of maize, peanut meal, broiler and layer feeds were collected directly at poultry farms, poultry production sites and poultry feed dealers in three agroecological zones (AEZs) of Cameroon and analyzed for moisture content and aflatoxin levels. The results indicate that the mean of the moisture content of maize (14.1%) was significantly ( P < 0.05) higher than all other commodities (10.0%–12.7%). Approximately 9% of maize samples were positive for aflatoxin, with concentrations overall ranging from <2 to 42 μg/kg. Most of the samples of peanut meal (100%), broiler (93.3%) and layer feeds (83.0%) were positive with concentrations of positive samples ranging from 39 to 950 μg/kg for peanut meal, 2 to 52 μg/kg for broiler feed and 2 to 23 μg/kg for layer feed. The aflatoxin content of layer feed did not vary by AEZ, while the highest (16.8 μg/kg) and the lowest (8.2 μg/kg) aflatoxin content of broiler feed were respectively recorded in Western High Plateau and in Rainforest agroecological zones. These results suggest that peanut meal is likely to be a high risk feed, and further investigation is needed to guide promotion of safe feeds for poultry in Cameroon.
épidémiologie géographique des maladies diarrhéiques à Yaoundé (Cameroun)
Blaise Nguendo Yongsi,Gérard Salem,Jean-Claude Bruneau
M@ppemonde , 2008,
Abstract: Les maladies diarrhéiques constituent un problème majeur de santé publique pour le Cameroun. En dépit d’une morbidité et d’une mortalité élevées et constantes, l’endémie diarrhéique demeure insuffisamment documentée. Une étude épidémiologique sur 3 034 enfants agés de 6 à 59 mois, répartis dans 20 quartiers de Yaoundé, a été réalisée en mai 2002. Nous avons étudié la prévalence des maladies diarrhéiques et leur distribution dans l’espace urbain. Les résultats des examens microbiologiques montrent un taux moyen urbain de prévalence de 14,4%. De nombreux facteurs ont été associés à ces diarrhées dans la ville. En outre, les niveaux d’atteinte diarrhéique varient considérablement d’un quartier à un autre de la ville.
Morphogenesis and propagation of complex cracks induced by thermal shocks
Blaise Bourdin,Jean-Jacques Marigo,Corrado Maurini,Paul Sicsic
Physics , 2013,
Abstract: We study the genesis and the selective propagation of complex crack networks induced by thermal shock or drying of brittle materials. We use a quasi-static gradient damage model to perform large scale numerical simulations showing that the propagation of fully developed cracks follows Griffith criterion and depends only on the fracture toughness, while crack morphogenesis is driven by the material's internal length. Our numerical simulations feature networks of parallel cracks and selective arrest in two dimensions and hexagonal columnar joints in three dimensions, without any hypotheses on cracks geometry and are in good agreement with available experimental results.
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