Acoustic measurements of boundary layer flux profiles over a sandy rippled bed under regular waves

The study of boundary layer sediment transport processes requires contemporaneous measurements of the bedforms, the flow and the sediment movement. Obtaining these three parameters, at the required temporal-spatial resolutions, has been traditionally difficult, especially within a few centimetres of the bed. To circumvent some of the deployment of an acoustic backscatter system, ABS, an acoustic ripple profiler, ARP, and an acoustic Doppler velocity profiler, ADVP, to measure sediment entrainment processes above a rippled bed under regular waves. High resolution acoustic observations of the suspend sediment concentration, flow and bedforms have been collected. Here we report on some of the initial results obtained from this study

Resonant photo-thermal conversion for sub-terahertz imaging

An original design of generic interest is proposed for fast imaging, in the field of sub-terahertz frequencies, by means of resonant coupling between an ultra-thin photo-thermal converter and a metallic grid upstream an infrared camera. The material is a sheet of polyimide material with a high content of absorptive carbon inclusions. We make use of the large difference between the IR and THz wavelengths in a quarter-wave planar geometry, to ensure a highly efficient and stable conversion process. A complete setup has been implemented for demonstration purposes, using the beam from a Gunn diode at 110 GHz. Experimental results are in good agreement with the predictions from the numerical model, which helps to validate the concept and the requirements for geometrical adjustment

Mémoires d'industries.- Le Monde alpin et rhodanien, n° 2-4, 1996, 348 p.

Dix ans après un premier numéro (3-4/1987) consacré aux techniques et au patrimoine industriel, la revue éditée par le Musée dauphinois revient sur l'histoire industrielle régionale, en rassemblant une vingtaine de contributions, retenues, nous dit Jean Guibal en avant-propos, " pour leur capacité à rendre compte des principales directions de la recherche actuelle ". Quatre concernent d'abord les sources, écrites ou iconographiques, de l'industrie. Vital Chomel rend compte, en expert " qui n'..

Effect of fibers and whole grain content on quality attributes of extruded cereals

Incorporation of fiber in cereals may lead to quality issues, thus decreasing consumer acceptance. This is partially due to deterioration of the microstructure, one of the primary quality attributes of cereals. The objective of this study was to better understand the mechanisms by which dietary fibers affect the quality of cereal products during extrusion-cooking. The study quantified the effect of amount and type of fiber and whole grain on (i) texture, (ii) structure, and (iii) rehydration properties of extruded cereals. New innovative methods were applied and combined with traditional techniques to characterize both the structure and the rehydration properties. Extruded cereals were produced using a starch-based recipe (whole and wheat flours) and two sources of fibers (oat bran concentrate and wheat bran). The oat and wheat bran levels used in this study were 0, 10, and 20%. The different mixtures were extruded in a pilot twin-screw extruder BC21 (Clextral) and then sugar coated after drying. Mechanical properties of extruded cereals were investigated by compression test. The cellular structure was observed by X-ray tomography. The quality of coating (thickness, homogeneity) was analyzed by optical coherence tomography. The rehydration properties of such cereals in milk were evaluated by magnetic resonance imaging and optical coherence tomography. This work revealed that structure assessment of extruded cereals may lead to a better understanding of the effect of fiber addition on texture and rehydration properties. The application of innovative methods, such as optical coherence tomography and magnetic resonance imaging, was found to be useful to quantify the structural properties

Les cahiers d’école de Thérèse de Lisieux, 1877-1888

Ce gros volume, précédé d’une utile introduction par Mgr Guy Gaucher, carme et ancien évêque auxiliaire de Bayeux-Lisieux, est la publication, avec d’excellentes reproductions en couleurs, des 25 cahiers et de quelques feuilles volantes de Thérèse conservés au Carmel de Lisieux. Grâce aux précisions apportées en introduction, nous apprenons que la scolarité de Marie-Thérèse Martin, orpheline de mère à quatre ans, a connu trois phases : une phase domestique aux Buissonnets à Lisieux, de 1878 à..

Ludovic FROBERT, Jean Pierre POTIER et André TIRAN [dir.], Économistes en Lyonnais, en Dauphiné et en Forez, Lyon, Institut des sciences de l'homme, 2000, 414 p.

Nos collègues du Centre Walras ont pris l'initiative de cet ouvrage qui rassemble 33 notices (qu'on pourrait qualifier de biographies intellectuelles) d'hommes (notons l'exclusivisme masculin) nés dans la région (huit à Lyon, quatre à Grenoble, trois en Forez, un en Bugey) ou ayant ou ayant enseigné et vécu dans la région dont le plus anciens sont les Grenoblois Bonnot de Mably (1709-1785) et son frère Condillac (1714-1780), les plus récents le Grenoblois Emmanuel Mounier (1905-1950), qu'on s..

MRI texture analysis as means for addressing rehydration and milk diffusion in cereals

Cereals microstructure is one of the primary quality attributes of cereals. Cereals rehydration and milk diffusion depends on such microstructure and thus, the crispiness and the texture, which will make it more palatable for the final consumer. Magnetic Resonance Imaging (MRI) is a very powerful tomographic tool since acquisition parameter leads to a wide possibility for identifying textures, structures and liquids mobility. It is suited for noninvasive imaging of water and fats. Rehydration and diffusion cereals processes were measured by MRI at different times and using two different kinds of milk, varying their fat level. Several images were obtained. A combination of textural analysis (based on the analysis of histograms) and segmentation methods (in order to understand the rehydration level of each variety of cereals) were performed. According to the rehydration level, no advisable clustering behaviour was found. Nevertheless, some differences were noticeable between the coating, the type of milk and the variety of cereals

Philippe BOURDIN et Bernard GAINOT [dir.], La République Directoriale. Actes du colloque de Clermont-Ferrand (22-24 mai 1997), s.l., Société des études robespierristes/Centre d'histoire des entreprises et des communautés/Centre de recherches révolutionnaires et romantiques, s.d. [1998], 2 volumes, 1095 p.

Publier les actes d'un Colloque universitaire moins d'un an après sa tenue est assurément une gageure, que les deux organisateurs ont allègrement relevée. On regrettera certes une composition lâche qui laisse souvent trop de blancs en bas de page, et surtout l'absence d'index toujours utile pour lecteurs pressés. Mais la matière est riche (53 des 54 communications au colloque) et plurielle, regroupée en huit " parties " quantitativement équilibrées ; tome 1 : Images du Directoire, les institu..