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51.
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Lucie Chapelle Allan Lyckegaard Yukihiro Kusano Carsten Gundlach Mathilde Rosendahl Foldschack Dorthe Lybye Povl Brøndsted 《Journal of Materials Science》2018,53(9):6390-6402
A method to determine the orientation and diameter distributions of mineral wool fibre networks using X-ray tomography and image analysis is presented. The method is applied to two different types of mineral wool: glass wool and stone wool. The orientation information is obtained from the computation of the structure tensor, and the diameter is estimated by applying a greyscale granulometry. The results of the image analysis indicate the two types of fibres are distributed in a 2D planar arrangement with the glass wool fibres showing a higher degree of planarity than the stone wool fibres. The orientation information is included in an analytical model based on a Euler–Bernoulli beam approximation. The model enables prediction of the transverse stiffness. It is indicated that the glass wool transverse stiffness is lower than the stone wool transverse stiffness. Comparison with experimental results confirms the assumption that the underlying deformation mechanism of mineral wool is the bending of fibre segments between bonds. 相似文献
53.
Polyphenol antioxidants from cocoa pods: Extraction optimization,effect of the optimized extract,and storage time on the stability of palm olein during thermoxidation
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54.
Just Noticeable Differences and Weber Fraction of Oral Thickness Perception of Model Beverages
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Sara Camacho Mathilde Dop Cees de Graaf Markus Stieger 《Journal of food science》2015,80(7):S1583-S1588
Rheological properties of beverages contribute considerably to texture perception. When developing new beverages, it is important to have knowledge on the smallest differences of viscosity which a consumer can discriminate. Thickness is the sensory attribute most commonly used to describe the viscosity of beverages. The aim of this study was to determine the Just Noticeable Differences (JNDs) of oral thickness perception and the Weber fraction (K) of Newtonian model stimuli (maltodextrin solutions). JNDs were determined using the method of constant stimuli with 5 reference stimuli ranging in viscosity from 10 to 100 mPa?s. JNDs increased with increasing viscosity of the reference stimulus. The Weber fraction (K) for oral thickness perception of model beverages was K = 0.26 for the studied viscosity range. The Weber fraction for oral thickness perception is comparable to Weber fractions reported in literature for perception of kinesthetic food firmness and spreadability, creaminess, sourness, and bitterness perception. This demonstrates that the human sensitivity towards oral discrimination of thickness of liquid stimuli is comparable to the human sensitivity towards discrimination of specific texture properties and specific taste stimuli. 相似文献
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We address in this paper the autonomous derivation of re-use criteria, needed for channel assignment in channelized wireless voice and data communications systems, and of neighbor lists, needed for call-processing functions. We present an approach that relies on signal strength measurements collected by the system itself, during operation. This approach can be implemented with conventional equipment and functionality provided by the current air interface standards for circuit-based and packet-based access, employing either centralized or distributed control. No regularity requirements are imposed on the grid of cells or on the RF re-use pattern, and no knowledge is assumed of the base station locations. We describe the data collection mechanism and design the associated statistical hypothesis tests. 相似文献
57.
Mathilde Koscielny 《Bulletin of Engineering Geology and the Environment》2008,67(4):585-595
This work focuses on the interaction between human activity in mountainous areas and slope movement hazards. The paper considers
the triggering factors and processes of instability in the urbanized area of Les Arcs, an area exploited for mass ski runs
and where many debris flows have occurred over the last 40 years. A progressive survey of the geological, geomorphological,
hydrological, hydrogeological and climatic contexts is necessary to tackle the complexity of the phenomena. The human impact
is considered as well. From the analysis, the geology associated with a specific climate was determined to be the main triggering
factor for debris flow hazards. The influence of the glacial and postglacial period on the geomorphological aspects (e.g.
steep slopes) and on the mechanical component of the superficial formations is the main factor. Furthermore, an analysis of
regional meteorological data over the last 5 decades has emphasized a significant evolution of the climate since the 1960s
which resulted in a general increase in temperature, rainfall (with seasonal variations) and the occurrence of extreme weather
events, with long term implications for erosion and on water balance. This seems to be exacerbated by recent human activities
which have significantly changed the natural environment: deforestation, changes in vegetation, the development of impervious
surfaces such as roofs, roads and car parks, the creation of ski runs and the intensive exploitation of the catchment, all
of which may have an influence on runoff and erosion affecting the natural surface structure. These changes and their effects
on such factors as runoff and erosion have been reviewed and analyzed. In particular, the effects on hydrology have been highlighted
by a hydrological modeling created using PCRaster Environmental Software. The hydrology of the Ravoire torrent before the
creation of the ski resort was compared with the present configuration of the catchment. The annual water balance model shows
that the ski resort generates a significant increase in the river flow compared to that before the change in land use. The
parametric analyses undertaken revealed that the deforestation, the development of ski slopes and impervious areas are responsible
for the reduction in infiltration inducing runoff. The maximum increase in water flow occurs during periods of natural high
water flow (during snow melt) when the risk of debris flows is naturally high. For the last 20 years, this phenomenon has
been amplified by the increasing production of artificial snow on the ski runs. Finally, a complementary model was created
to consider the effects over a short time scale. The results of this rain event model emphasize the change in the hydrological
response of the rivers after rainfall as a consequence of the change in land use. In particular this indicated a rise in the
peak flow towards the resort, which may activate erosive processes above the debris flow source areas.
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Gilles J. Doyon Christophe Poulet Luc Chalifoux Mathilde Cloutier Bernard Pascat Catherine Loriot Pierrick Camus 《Packaging Technology and Science》1995,8(3):159-170
It is very important that measurements of the diffusion of aromas and volatile substances in trace amounts (p.p.m.) through synthetic materials, such as PVC, PE and PP monolayers, be accurate and repeatable. The primary goal of this work was to familiarize ourselves with the Aromatran®, a new, fully automated analytical instrument, for the measurement of a ketone (2-butanone or MEK) at 23°C. A discussion of results is provided, along with comments on the system's userfriendliness and the cost of the tests. 相似文献