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1.
2.
Martine Decloux Manuel Dornier & Isabelle Gratius 《International Journal of Food Science & Technology》1996,31(2):153-166
Gum arabic is a natural gum exuded mainly by the trees Acacia senegal , currently used in the food industries for its emulsifying, thickening and stabilizing properties. Its present processing includes various operations providing a quite turbid product. Crossflow microfiltration could be interesting for the clarification and the cold-pasteurization of the gum arabic solutions. Several experiments were therefore made with the crossflow microfiltration unit at ENSIA, using two different systems: the classical one (without permeate circulation), and the co-current permeate flow system (CCPF) allowing the exploration of the low transmembrane pressures range. With gum arabic solutions of 0.17g solids g−1 solution and 70°C, the best results after 60 min of filtration (105.7 L h−1 m−2 , 4.4% of solids retention and 83.4% of clarification) were obtained with the CCPF system at low transmembrane pressure and high crossflow velocity (0.3 bar and 7.5ms−1 ). 相似文献
3.
Electron Spin Resonance, Differential Scanning Calorimetry and rheological techniques have been used to study the physical
changes induced by temperature in lard and in the solid and liquid fractions obtained by fractionation of lard at 15 C. The
mobilization process of a C18 fatty acid nitroxide derivative dispersed in the molten fat has been observed in the temperature
range −50 to +70 C.
The mobilization of the probe seemed to be concomitant with the melting of the low melting point glycerides. Above this temperature,
all the probes were in the liquid phase and their mobility reflected the viscosity of their liquid environment, or the viscosity
of the bulk fat when crystal was no longer present.
Probe mobility was temperature dependent, and it was identical for the three fats at the same temperature, despite their different
triglyceride compositions. 相似文献
4.
5.
Youren Xu Avigdor Zangvil Martine Landon François Thevenot 《Journal of the American Ceramic Society》1992,75(2):325-333
A flexural strength of up to 1 GPa was achieved in SiC-AIN materials and is attributed to a dense, equiaxial grain structure of the 2H(δ) SiC-AIN solid solution, with a relatively uniform grain size of ∼ 1 μm. The strength was found to decrease with increasing grain size. While the β→α phase transformation and the formation of various metastable polytypes make microstructural control difficult in SiC materials, excellent control is facilitated in SiC-AIN materials as a result of the stable 2H solid solution. Several mechanisms of grain refinement during the β→ 2H transition were observed, most notably the direct formation of several 2H grains from a single β grain. In addition, grain growth is limited by the diffusion-controlled nature of the transition. These mechanisms could be utilized to achieve even higher strength values, with potentially higher reliability of the materials in structural applications. 相似文献
6.
D. M. dos Anjos K. B. Kokoh J.M. Léger A.R. DE Andrade P. Olivi G. Tremiliosi-Filho 《Journal of Applied Electrochemistry》2006,36(12):1391-1397
Pt–Mo alloy electrocatalysts were prepared by an arc-melting furnace process to investigate the origin of their enhanced activity toward ethanol oxidation. Two Mo contents were chosen in zones of the binary phase diagram where they are supposed to form either a pure alloy mixture or a solid solution. Pt–Mo alloy catalysts were more active than Pt-alone. Gradual Mo dissolution at the electrode surface was observed after voltammetric and chronoamperometric measurements. The dissolved Mo contributed to the catalytic effect of the electrode as underpotentially deposited (upd) adatoms. This dissolution probably also leads to an increase in the electrode surface roughness. Low molybdenum content in the electrode material enhances the activity toward ethanol oxidation when compared to Pt-alone. Ethanol oxidation was also investigated by in situ infrared reflectance spectroscopy in order to determine the presence of adsorbed intermediates like CO species. Acetaldehyde, acetic acid and CO2 were also found by spectroscopic experiments. 相似文献
7.
Steven Schockaert Martine De Cock Etienne E. Kerre 《Soft Computing - A Fusion of Foundations, Methodologies and Applications》2010,14(8):869-886
When searching for information about historical events, queries are naturally formulated using temporal constraints. However,
the structured temporal information needed to support such constraints is usually not available to information retrieval systems.
Furthermore, the temporal boundaries of most historical events are inherently ill-defined, calling for suitable extensions
of classical temporal reasoning frameworks. In this paper, we propose a framework based on a fuzzification of Allen’s Interval
Algebra to cope with these issues. By using simple heuristic techniques to extract temporal information from web documents,
we initially focus more on recall than on precision, relying on the subsequent application of a fuzzy temporal reasoner to
improve the reliability of the extracted information, and to deal with conflicts that arise because of the vagueness of events.
Experimental results indicate that a consistent and reliable knowledge base of fuzzy temporal relations can thus be obtained,
which effectively allows us to target temporally constrained retrieval tasks. 相似文献
8.
Abstract: Just like rough set theory, fuzzy set theory addresses the topic of dealing with imperfect knowledge. Recent investigations have shown how both theories can be combined into a more flexible, more expressive framework for modelling and processing incomplete information in information systems. At the same time, intuitionistic fuzzy sets have been proposed as an attractive extension of fuzzy sets, enriching the latter with extra features to represent uncertainty (on top of vagueness). Unfortunately, the various tentative definitions of the concept of an ‘intuitionistic fuzzy rough set’ that were raised in their wake are a far cry from the original objectives of rough set theory. We intend to fill an obvious gap by introducing a new definition of intuitionistic fuzzy rough sets, as the most natural generalization of Pawlak's original concept of rough sets. 相似文献
9.
Eric Sultan Arezki Boudaoud Martine Ben Amar 《Journal of Engineering Mathematics》2004,50(2-3):209-222
The stability of evaporating very thin films of a polar liquid is investigated. The microscopic interaction with the substrate
and capillarity are taken into account in a lubrication equation. The stability of a flat interface is studied when evaporation
is limited by the diffusion of the vapour in the gas phase. The evaporation rate is computed and evaporation is shown to be
stabilizing. A stability phase diagram is obtained. A weakly nonlinear analysis leads to a film-thickness amplitude equation
that is non local in space. Physical consequences of the results are eventually discussed. 相似文献
10.
Elodie Mareux Martine Lapalus Amel Ben Saad Renaud Zelli Mounia Lakli Yosra Riahi Marion Almes Manon Banet Isabelle Callebaut Jean-Luc Decout Thomas Falguires Emmanuel Jacquemin Emmanuel Gonzales 《International journal of molecular sciences》2022,23(18)
ABCB11 is responsible for biliary bile acid secretion at the canalicular membrane of hepatocytes. Variations in the ABCB11 gene cause a spectrum of rare liver diseases. The most severe form is progressive familial intrahepatic cholestasis type 2 (PFIC2). Current medical treatments have limited efficacy. Here, we report the in vitro study of Abcb11 missense variants identified in PFIC2 patients and their functional rescue using cystic fibrosis transmembrane conductance regulator potentiators. Three ABCB11 disease-causing variations identified in PFIC2 patients (i.e., A257V, T463I and G562D) were reproduced in a plasmid encoding an Abcb11-green fluorescent protein. After transfection, the expression and localization of the variants were studied in HepG2 cells. Taurocholate transport activity and the effect of potentiators were studied in Madin–Darby canine kidney (MDCK) clones coexpressing Abcb11 and the sodium taurocholate cotransporting polypeptide (Ntcp/Slc10A1). As predicted using three-dimensional structure analysis, the three variants were expressed at the canalicular membrane but showed a defective function. Ivacaftor, GLP1837, SBC040 and SBC219 potentiators increased the bile acid transport of A257V and T463I and to a lesser extent, of G562D Abcb11 missense variants. In addition, a synergic effect was observed when ivacaftor was combined with SBC040 or SBC219. Such potentiators could represent new pharmacological approaches for improving the condition of patients with ABCB11 deficiency due to missense variations affecting the function of the transporter. 相似文献