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71.
Jean-Michel Piau 《International Journal of Engineering Science》1983,21(10):1185-1191
An intégral constitutive equation is written using a particular reference frame, built with unit vectors along the principal axes of the rate-of-deformation tensor, and using the associated intrinsic rate-of-rotation. This equation is easier to handle in calculations than corotational or codeformational models. The material functions for a rheological model including the first six terms of the constitutive equation have been studied in steady and unsteady shear flows, as well as in elongational flows. Material functions are readily written from six memory functions and no inconsistency comes out. 相似文献
72.
Jean-Michel Lucas Philippe Berticat Bernard Chabert Jean-Pierre Soulier Louis Gavet Noëlle Valentin 《大分子材料与工程》1977,65(1):103-120
Sizing is generally employed to protect yarns when submitted to mechanical stress during weaving. Two commercial acrylic copolymers used for sizing of polyester yarns are studied: an acrylonitril-acrylic acid copolymer (A) as a bad sizing product and an acrylonitril-acrylic acid-ethyl acrylate copolymer (B) as a good one. A relationship has been established between physico-chemical parameters and sizing efficiency. Interactions between polyester yarn and size (and samples used as models) are studied both in solution and in dry state. It must be pointed out that the action of water is basically due to its plasticizing properties. The presence of ethyl acrylate favorizes the polyester yarn impregnation with size B in aqueous solution. Adhesion in the dry state is mainly caused by acrylic acid. Finally the action of neutralizing agents and imbeding oils is discussed. 相似文献
73.
Andrea Musi Pascale Massiani Dalil Brouri Jean-Michel Trichard Patrick Da Costa 《Catalysis Letters》2009,128(1-2):25-30
Reducing of nitrogen oxides (NO x ) in a lean exhaust gases has become one of the most important environmental concerns. Among the different active phases studied for NO x reduction reaction, silver-based catalysts supported over alumina show good performances using, as reducing agents, either hydrocarbons or oxygenated compounds. Nevertheless, a good understanding of the mechanism reaction has not been reached yet. This comprehension requires a better characterisation of the silver-based catalysts system. In our study, Ag/Al2O3 catalysts showed high efficiency in NO x reduction using ethanol as reducing agent. The conversion plots, in steady state conditions for the different samples Ag/Al2O3 (0.8–3.5% Ag wt), show a great dependance of the activity with the metal loading. The optimal silver loading has been established around 2 wt.% Increasing the silver loading, the temperature of maximal NO x conversion shifted toward the lower temperatures. According to the literature, a reduced and an oxide phase of silver have been observed by UV–Vis spectroscopy. The ratio between the two phases is changing with the silver loading. However, temperature programmed reduction (TPR) measurements reveal the presence of two types of oxide phases. TPR reveal the coexistence of a silver oxide phase (Ag2O), according to a production of water in the course of the reaction, and a non-oxygenated phase attributed to isolated Ag+ cation. Thus, an original way using TPR measurements has been developed to differentiate the various oxidized phases. The aim of this characterisation is to correlate the catalyst’s activity with the observed silver phases, in order to understand the nature of phase active for NO x reduction at low temperatures. 相似文献
74.
Ireneusz Szcześniak Tadeusz Czachórski Jean-Michel Fourneau 《Photonic Network Communications》2008,16(3):253-261
We present an approximate analytical method for the evaluation of packet loss probability in synchronous optical packet-switched
networks which operate under limited deflection routing with the contention resolution method based on priorities. Packets
are lost because they are removed by nodes. They are removed because they experience too many deflections and stay prohibitively
long in the network. Such packets have to be removed because they will be ignored by the transmission protocols (like TCP)
and because the quality of their optical signal is unacceptable. Presented are results for the network in the topology of
the torus of the two-dimensional grid, which operates at a steady state with the uniform load u, . The strength of our analysis is its novel mathematical approach, which is capable of providing very low packet loss probabilities.
For the network composed of 100 nodes, we predict the packet loss probability as low as 10−9 or lower, while simulation provided results only at the order of 10−6. For a given permissible packet loss probability, our analysis provides the maximal network load and the number of allowed
deflections. We verify the analysis with simulation in the cases for which simulation gave results.
相似文献
Jean-Michel FourneauEmail: |
75.
Océane Florès Dr. Denis Velic Nesrine Mabrouk Prof. Ali Bettaïeb Christophe Tomasoni Prof. Jean-Michel Robert Dr. Catherine Paul Dr. Christine Goze Christos Roussakis Dr. Ewen Bodio 《Chembiochem : a European journal of chemical biology》2019,20(17):2255-2261
A family of bi- and tetrametallic gold(I) phosphine dithiocarbamate complexes were synthesized, starting from cyclam and dimethylcyclam polyazamacrocycles, respectively, along with their monometallic gold(I) chloridophosphine precursors. Their antiproliferative properties were evaluated on two cancer cell lines (A549 and NSCLC-N6-L16). Most of the mono- and bimetallic complexes displayed strong activities and, in particular, one bimetallic derivative showed antiproliferative properties in the low micromolar range. Insights into the structure–activity relationships are given, along with determination of the thioredoxin reductase inhibition potential, two-photon imaging of the fluorescent derivatives, and evaluation of gold uptake. 相似文献
76.
Domingue Catherine Lemieux Jean-Michel Grenon Martin Molson John Therrien René Lajoie Pierre-Luc Blessent Daniela 《Mine Water and the Environment》2019,38(3):497-506
Mine Water and the Environment - Water inflows through fracture networks are a major economic and safety issue in underground mines. Although pre-grouting of pilot holes during mine development... 相似文献
77.
Son Ho-Van Baptiste Bouillot Daniel Garcia Jrome Douzet Ana Cameirao Saheb Maghsoodloo-Babakhani Jean-Michel Herri 《化学工程与技术》2019,42(7):1481-1491
Clathrate hydrates most often grow at the interface between liquid water and another fluid phase (hydrocarbon) acting as a provider for the hydrate guest molecules, and some transfer through this shell is required for the hydrate growth to proceed, thus self‐limiting the reaction rate. An optical microscope and a horizontal reaction cell are utilized to capture the shell growth phenomenology and to estimate the hydrate layer growth rates from sequential pictures. Cyclopentane (CP) is chosen as the hydrate‐forming molecule to obtain hydrates at low pressure. Experimental hydrate layer growth rates are provided for the CP+brine system, using various combinations of salts and degrees of subcooling. 相似文献
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