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Search Results: 1 - 10 of 11340 matches for " Fran?ois Duchêne "
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Les affaissements miniers dans le bassin ferrifère lorrain : quand le territoire re-politise la gestion du risque
Franois Duchêne
Développement Durable et Territoires , 2008,
Abstract: Avec la fin de l’extraction et la vente des cités minières, les affaissements miniers, de risques liés au travail se sont transformés en risques environnementaux. Les dégats miniers étaient traités jusque-là en interne par les exploitants, et ils sont donc devenus une affaire des services de l’Etat lors de la remise des concessions minières. Ce transfert a été particulièrement vif dans le bassin ferrifère lorrain, aux couches peu profondes et donc plus propice que d’autres aux phénomènes d’affaissement. Les réactions locales à ces effondrements ont été d’autant plus virulentes qu’elles touchaient un territoire en crise. Les services de l’Etat ont avant tout cherché à apporter des réponses techniques et sectorielles pour prévenir les risques. Or les affaissements ont fait bouger bien plus que les maisons. Ils ont mis en mouvement des acteurs locaux issus d’une histoire politique, économique et sociale née des mines et de la sidérurgie et meurtries par la désindustrialisation. Au final, c’est précisément parce qu’il y avait un contexte territorial spécifique, avec la mobilisation de forces sociales encore chargées d’une histoire toute proche, qu’une dimension politique s’est imposée dans la gestion et le traitement de ces risques. With the end of mining activity and the sale of miners’ dwellings, the question of subsidence, hitherto an industrial hazard, became an environmental risk. The damage caused by mining, an issue previously addressed privately by the owners, became the responsibility of government services when mining concessions were handed over to the State. The handover was particularly delicate in the iron-ore basin of Lorraine, where the closeness of the ore to the surface made this area more liable to subsidence than others. Local reactions to the phenomenon were all the more heated as the territory was already in the throes of an economic crisis. The solutions sought by State services to safeguard against risk were primarily technical and sector-specific. However, it was not just houses that were ‘moved’ by the subsidence. It likewise provoked a reaction from local stakeholders who, with a political, economic and social heritage rooted in mining and the steel industry, had been bruised and battered by deindustrialisation. In the end, it was, in fact, due to a specific, territorial context, involving the mobilisation of social forces still deeply influenced by recent history, that the management and treatment of these risks took on a political dimension.
The PARAChute Project: Remote Monitoring of Posture and Gait for Fall Prevention
Hewson David J,Duchêne Jacques,Charpillet Franois,Saboune Jamal
EURASIP Journal on Advances in Signal Processing , 2007,
Abstract: Falls in the elderly are a major public health problem due to both their frequency and their medical and social consequences. In France alone, more than two million people aged over 65 years old fall each year, leading to more than 9 000 deaths, in particular in those over 75 years old (more than 8 000 deaths). This paper describes the PARAChute project, which aims to develop a methodology that will enable the detection of an increased risk of falling in community-dwelling elderly. The methods used for a remote noninvasive assessment for static and dynamic balance assessments and gait analysis are described. The final result of the project has been the development of an algorithm for movement detection during gait and a balance signature extracted from a force plate. A multicentre longitudinal evaluation of balance has commenced in order to validate the methodologies and technologies developed in the project.
The PARAChute Project: Remote Monitoring of Posture and Gait for Fall Prevention
David J. Hewson,Jacques Duchêne,François Charpillet,Jamal Saboune
EURASIP Journal on Advances in Signal Processing , 2007, DOI: 10.1155/2007/27421
Abstract: Falls in the elderly are a major public health problem due to both their frequency and their medical and social consequences. In France alone, more than two million people aged over 65 years old fall each year, leading to more than 9 000 deaths, in particular in those over 75 years old (more than 8 000 deaths). This paper describes the PARAChute project, which aims to develop a methodology that will enable the detection of an increased risk of falling in community-dwelling elderly. The methods used for a remote noninvasive assessment for static and dynamic balance assessments and gait analysis are described. The final result of the project has been the development of an algorithm for movement detection during gait and a balance signature extracted from a force plate. A multicentre longitudinal evaluation of balance has commenced in order to validate the methodologies and technologies developed in the project.
What Process Optimizes Convective Drying of Farm Products with Complex Constitution: Case of Okra (Abelmoschus esculentus)  [PDF]
Ouoba Kondia Honoré, Desmorieux Hélène, Zougmore Franois
Journal of Agricultural Chemistry and Environment (JACEN) , 2019, DOI: 10.4236/jacen.2019.81002
Abstract: In this paper, we propose an optimized process for farm product convective drying. Above and beyond the influence of the air parameters on foodstuff convective drying, this work shows that product internal parameters and drying proceedings must be taken into account during the evaluation of their convective drying. Results indicate that okra maturity influences its convective drying. It dries faster when it is too young or when it is advanced age. Drying time of okra of 1, 2, 3, 4 and 5 days old is respectively 580 min, 780 min, 990 min, 1200 min and 850 min. Also, one observes that considering okra on its three zones according it length, i.e. its base, middle and extremity parts have not the same resistance to transfers during convective drying. These three zones have respectively 400 min, 520 min and 600 min of drying time. Okra cut reveals a major importance on its convective drying evaluation. The longitudinal cut di-viding okra on four parts, sliced with 5 mm and 10 mm of thickness and the whole okra put respectively 150 min, 200 min, 280 min and 400 min for their drying. At last, three (03) different constituents of okra, namely, the skin, the seeds and central material behave differently during convective drying. The drying time of the central material, the seeds and the skin is about 70 min, 150 min and 190 min respectively, against 400 min for the whole okra.
Effect of Initial Size and Shape Importance on Masse Transfer during Convective Drying  [PDF]
Kondia Honoré Ouoba, Franois Zougmore, Hélène Desmorieux
Food and Nutrition Sciences (FNS) , 2018, DOI: 10.4236/fns.2018.912109
Abstract: In this paper the influence of sample initial size on their convective drying at 80°C using convective dryer is determined. Results prove that initial size must be taken into account when drying process was estimated. This influence is limited by its form of cut. Comparing cubic form and parallelepiped (slice) one; results seem to show that thickness is the most important parameter governing the transfer phenomena during foodstuff convective drying. Three slices with thickness of 0.5 cm and surface area of 17, 82 and 112 cm2 respectively, dry better than cubic sample with a = 1 cm or a = 2 cm of arrest and having respectively 6 and 24 cm2 of surface area. All things seem to show that initial surface is not only the essential parameter; but also the thickness of the sample must be taken into account. Indeed, all of the samples with equal thickness (0.5 cm) and different exchange surfaces dry at the same time, about 210 min, comparing with cubic form 1 cm of arrest and 6 cm2 of surface and drying time of 230 min. A new parameter noted Dc called characteristic diameter is so considered to bridge the gaps. It is defined to be the diameter of the biggest sphere we can cut into a sample. This parameter is independent of form of the sample, and time increase with characteristic diameter increasing.
The VLTI / PIONIER near-infrared interferometric survey of southern T Tauri stars. I. First results
Fabien Anthonioz,Franois Ménard,Christophe Pinte,Jean-Baptiste Le Bouquin,Myriam Benisty,Wing-Fai Thi,Olivier Absil,Gaspard Duchêne,Jean-Charles Augereau,Jean-Phillipe Berger,Simon Casassus,Gilles Duvert,Bernard Lazareff,Fabien Malbet,Rafael Millan-Gabet,Matthias R. Schreiber,Wesley Traub,Gérard Zins
Physics , 2014, DOI: 10.1051/0004-6361/201424520
Abstract: Context : The properties of the inner disks of bright Herbig AeBe stars have been studied with near infrared (NIR) interferometry and high resolution spectroscopy. The continuum and a few molecular gas species have been studied close to the central star; however, sensitivity problems limit direct information about the inner disks of the fainter T Tauri stars. Aims : Our aim is to measure some of the properties of the inner regions of disks surrounding southern T Tauri stars. Methods : We performed a survey with the PIONIER recombiner instrument at H-band of 21 T Tauri stars. The baselines used ranged from 11 m to 129 m, corresponding to a maximum resolution of 3mas (0.45 au at 150 pc). Results : Thirteen disks are resolved well and the visibility curves are fully sampled as a function of baseline in the range 45-130 m for these 13 objects. A simple qualitative examination of visibility profiles allows us to identify a rapid drop-off in the visibilities at short baselines in 8 resolved disks. This is indicative of a significant contribution from an extended contribution of light from the disk. We demonstrate that this component is compatible with scattered light, providing strong support to a prediction made by Pinte et al. (2008). The amplitude of the drop-off and the amount of dust thermal emission changes from source to source suggesting that each disk is different. A by-product of the survey is the identification of a new milli-arcsec separation binary: WW Cha. Spectroscopic and interferometric data of AK Sco have also been fitted with a binary and disk model. Conclusions : Visibility data are reproduced well when thermal emission and scattering form dust are fully considered. The inner radii measured are consistent with the expected dust sublimation radii. Modelling of AK Sco suggests a likely coplanarity between the disk and the binary's orbital plane
Characterization of Okra Convective Drying, Influence of Maturity  [PDF]
Ouoba Kondia Honoré, Zougmoré Franois, Sam Raguilignaba, Toguyeni Aboubacar, Desmorieux Hélène
Food and Nutrition Sciences (FNS) , 2014, DOI: 10.4236/fns.2014.56069
Abstract:

An experimental study for the drying kinetics of whole okra was carried out. In the study, different ages were considered by taking into account influence of okra maturity on its convective drying. The 2D moisture evolution inside the product and its maturity were evaluated by fitting experimental data versus drying time. The water effective diffusion coefficient of okra at different maturity states was gotten by the experimental model using Fick’s second law. A parametric study was carried out in the ranging of okra age from 2 to 7 days at 60℃, both fruits gathered on the same plant to avoid divergences due to okra varieties that can induce difference on physical structure and the chemical composition. It was found from the experimental results that okra maturity has important influence on its behaviour during convective drying. At 2, 3, 4, 5 and 7 days old, the drying effective time was respectively 780, 1000, 1155, 850 and 750 min. Effective diffusivity of the okra in this order of age was 1.38 × 10-10, 6.09 × 10-11, 1.23 × 10-11, 8.98 × 10-11, and 1.05 × 10-10 m2/s in the present study, while the average initial moisture content was respectively 12.27, 9.00, 7.53, 5.97 and 4.92 Kgw/Kgdm.

Modeling phase transition and metastable phases
Franois James,Hélène Mathis
Physics , 2014,
Abstract: We propose a model that describes phase transition including metastable phases present in the van der Waals Equation of State (EoS). We introduce a dynamical system that is able to depict the mass transfer between two phases, for which equilibrium states are both metastable and stable states, including mixtures. The dynamical system is then used as a relaxation source term in a isothermal two-phase model. We use a Finite volume scheme (FV) that treats the convective part and the source term in a fractional step way. Numerical results illustrate the ability of the model to capture phase transition and metastable states.
Study of the Management of Diabetic Metabolic Emergency in the National Teaching Hospital HKM of Cotonou  [PDF]
Annelie Kerekou, Eugène Zoumenou, Médard Agbantey, Corneille Tiomon, Daniel Amoussou-Guenou, Franois Djrolo, Martin Chobli
Journal of Diabetes Mellitus (JDM) , 2014, DOI: 10.4236/jdm.2014.44049
Abstract: Objective: To study the epidemiological, clinical and therapeutic profile of diabetic metabolic emergencies. Patients and methods: This was a prospective study in descriptive and analytical referred conducted over a period of 6 months in the National Teaching Hosptial HKM of Cotonou December 1, 2011 to May 31, 2012. The patients included in the case of our study were those who, conscious or comatose, had submitted a diabetic hypoglycemia or abnormal blood sugar (2.5 g/l), with a positive glycosuria and ketonuria positive or not. All patients gave their consent for this study. Results: 2786 patients were admitted to the emergency room, 57 (2%) of acute metabolic decompensation of diabetes. DKA accounted for 1.1%, hyperosmolar hyperglycemic syndrome 0.5% and 0.4% hypoglycemia. For hyperglycemic decompensation, sex ratio was 0.8 for females with a mean age of 50.7 ± 16.9 (16-84). For hypoglycemia, male gender was predominant. As decompensation factors for hyperglycemia, infection was found in 54% (n = 30) of cases and stroke by 29% hypertension (n = 15). As for hypoglycemia triggers were dominated by dietary error (50%) and therapeutic errors (25%). 63% (n = 36) of patients underwent resuscitation. More than 3 out of 4 patients were resuscitated to insulin. 98% of patients were rehydrated. The outcome was favorable in 56% of cases. The death rate was 25 % (n = 14). Conclusion: Diabetes mellitus is a serious condition and its severity is mainly due to complications which can be acute or chronic.
Smoking Addiction and Risk Factors in Teenagers in Abidjan, Cote d’Ivoire  [PDF]
Aké-Assi Marie-Hélène, Coulibaly Amed, Eboua Tanoh Franois, Bhérat Kouadio Armel, Boko Kouassi Alexandre
Open Journal of Pediatrics (OJPed) , 2018, DOI: 10.4236/ojped.2018.84030
Abstract: A prospective cross-sectional descriptive and analytical study was conducted using an individual questionnaire over a four-month period from October 04th, 2013 to February 06th, 2014 in Abidjan. It included teenagers aged from 13 to 17 who are students among which some are not attending school and living in the street for others. The purpose of this study was to describe the socio-demographic characteristics of the teenagers addicted to smoking and to determine the factors associated with smoking addiction. 446 teenagers were recruited. A prospective cross-sectional descriptive and analytical study was conducted over a four-month period from October 4th, 2013 to February 06, 2014 in Abidjan. There were 76% boys versus 26% girls. The prevalence of smoking addiction was 81.9% for teenagers not attending school and living in the
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