Search results for "Engineering sciences"
showing 10 items of 2347 documents
Sorption of 4-ethylphenol and 4-ethylguaiacol by suberin from cork
2015
International audience; Cork shows an active role in the sorption of volatile phenols from wine. The sorption properties of 4-ethylphenol and 4-ethylguaiacol phenols in hydro-alcoholic medium placed in contact with suberin extracted from cork were especially investigated. To that purpose, suberin was immersed in model wine solutions containing several concentrations of each phenol and the amount of the compound remaining in the liquid phase was determined by SPME-GC-MS. Sorption isotherms of 4-ethylguaiacol and 4-ethylphenol by suberin followed the Henry's model. The solid/liquid partition coefficients (KSL) between the suberin and the model wine were also determined for several other volat…
Roughness and vegetation parameterizations at L-band for soil moisture retrievals over a vineyard field
2015
Abstract The capability of L-band radiometry to monitor surface soil moisture (SM) at global scale has been analyzed in numerous studies, mostly in the framework of the ESA SMOS and NASA SMAP missions. To retrieve SM from L-band radiometric observations, two significant effects have to be accounted for, namely soil roughness and vegetation optical depth. In this study, soil roughness effects on retrieved SM values were evaluated using brightness temperatures acquired by the L-band ELBARA-II radiometer, over a vineyard field at the Valencia Anchor Station (VAS) site during the year 2013. Different combinations of the values of the model parameters used to account for soil roughness effects (…
Effect of two novel bio-based rejuvenators on the performance of 50% RAP mixes - a statistical study on the complex modulus of asphalt binders and as…
2019
An experimental study was conducted to evaluate the effectiveness of two bio-additives as rejuvenators on the properties of asphalt mixtures containing 50% RAP and their binder constituents containing 37% RAP binder. Before mixing, the rejuvenators were blended with fresh bitumen and the extracted and recovered RAP bitumen, and changes in the rheological properties of the binders were assessed using performance grading (PG) criteria. The results showed that both rejuvenators could improve the low-temperature performance of the aged RAP binder and restore its low-temperature properties. Master curves for the unaged, RTFO-aged, and PAV aged blends were constructed using both the Christensen-A…
Data Compression Approach for Long-Term Monitoring of Pavement Structures
2019
Pavement structures are designed to withstand continuous damage during their design life. Damage starts as soon as the pavement is open to traffic and increases with time. If maintenance activities are not considered in the initial design or considered but not applied during the service life, damage will grow to a point where rehabilitation may be the only and most expensive option left. In order to monitor the evolution of damage and its severity in pavement structures, a novel data compression approach based on cumulative measurements from a piezoelectric sensor is presented in this paper. Specifically, the piezoelectric sensor uses a thin film of polyvinylidene fluoride to sense the ener…
Full-scale validation of bio-recycled asphalt mixtures for road pavements
2019
Abstract Recycling of asphalt has become a well-established practice in many countries, however the road pavement industry remains a bulk consumer of extracted raw materials. Novel solutions that find root in circular economy concepts and life-cycle approaches are needed in order to enable optimisation of infrastructure resource efficiency, starting from the design stage and spanning the whole value chain in the construction sector. Itis within this framework that the present study presents a full-scale validation of asphalt mixtures specifically designed to ensure durability of flexible road pavements and at the same time enabling the reuse of reclaimed asphalt pavement (RAP) through the i…
A novel prototype to closely mimic mastication for in vitro dynamic measurements of flavour release
2005
International audience; Flavour release during eating of a food depends upon many parameters that can hardly be managed. In-vivo measurements by the APCI MS-nose method allowed temporal sensory evaluation and flavour release data to be directly correlated, but several limitations have frequently been reported. These were: high inter-individual variability, low repeatability of measurements, and weak experiment throughput due to panellists' exhaustion. To overcome most of these limitations, the use of an artificial mouth for online mesurement of flavour release is recommended. However, the systems used in previous reports were limited in terms of reproducing in-vivo oral functions and parame…
(Z)-dodec-3-en-1-ol, a novel termite trail pheromone identified after solid phase microextraction form Macrotermes annandalei
2001
International audience
3D Integration : towards high-performance innovative imaging sensors
2017
Nowadays, CMOS image sensors are almost exclusively architectured around analog pixels. A transition to purely digital pixels would significantly improve the performances of imagers. Unfortunately, such an approach is difficult to consider because it causes an oversized and unusable pixel for the consumer market. One of the promising ways to solve this problem of pixel integration is to think not only in 2D dimensions, but in 3D dimensions by distributing the different functionalities on several interconnected wafers.Thus, the work presented in this manuscript describes the design of a purely digital image sensor in CMOS 3D-IC 130 nm Tezzaron technology. This sensor is architectured around …
Rendre dynamique le matériel d'apprentissage du code de la route : un intérêt particulier pour les sourds
2017
Entretiens Jacques Cartier, QUEBEC, CANADA, 16-/10/2017 - 18/10/2017; ACOSUR : Accès au Code de la route et SURdité. Contexte : La réussite à l'examen du code de la route est un facteur facilitant l'insertion sociale et professionnelle. Avec un taux de réussite largement inférieur aux candidats entendants, les individus sourds éprouvent de nombreuses difficultés. Le matériel actuel composé d'images statiques ne serait pas compatible avec des habiletés temporelles dégradées dues à l'absence d'audition. Objectif : La présente étude s'intéresse au bénéfice d'un matériel dynamique basé sur des animations 3D par rapport à un matériel statique dans une tâche de prise de décision. Méthode : 21 can…
Libération et perception de composés de la flaveur au cours de la mastication de bases fromagères
2005
National audience; Relier la libération de composés de la flaveur (arôme et saveur) en bouche à la perception de la flaveur est encore une tâche difficile. La libération de flaveur pendant la mastication et l’ingestion d’un aliment dépend de plusieurs facteurs tels que la composition et la texture de l’aliment, les paramètres de salivation et de mastication, la nature des composés de la flaveur. L’objectif de l’étude est de tenter de relier la libération de composés volatils et non volatils, et la perception de la flaveur en prenant en compte les paramètres respiratoires, masticatoires et salivaires au cours de la mastication d’une base fromagère. La mesure de paramètres physiologiques orau…