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排序方式: 共有108条查询结果,搜索用时 15 毫秒
101.
K. Charlet J.P. Jernot M. Gomina J. Bréard C. Morvan C. Baley 《Composites Science and Technology》2009
The mechanical properties of flax fibres are analysed as a function of their biochemical and morphological characteristics. The fibres, from the Agatha variety, have been selected from either the top, the middle or the bottom of the stems. The results of each analysis are discussed according to the position of the fibre in the stem and compared among themselves. Considering a flax fibre as a natural composite, this study underlines the complexity of its structure and shows that many parameters intervene in its deformation behaviour. 相似文献
102.
Frédéric Rousseau Mehrdad Nikravech Linda Benabdelmoumène Cédric Guyon Daniel Morvan Jacques Amouroux 《Journal of Applied Electrochemistry》2007,37(1):95-101
The aim of this work was to synthesise and deposit a perovskite (La1-x
Sr
x
MnO3 or La1-x
Sr
x
CoO3) cathode on an SOFC electrolyte (8% Yttria Stabilised Zirconia – YSZ). The recombination of atomic oxygen on Sr doped LaMnO3 was performed in order to study the properties of perovskite for the adsorption of oxygen. The electrical resistance of the
layers was measured as a function of the chemical composition. Impedance measurements on different samples were performed
in order to analyse the electrochemical response of the cathode – electrolyte stack as a function of temperature and nature
of the atmosphere. Moreover, the Faradaic impedance representing the electrochemical processes at the cathode – electrolyte
interface was calculated from the global impedance in various conditions. 相似文献
103.
Laurent Ottaviani Erwan Morvan Marie-Laure Locatelli Dominique Planson Philippe Godignon Jean-Pierre Chante Albert Senes 《Solid-state electronics》1999,43(12):2215-2223
A complete study was driven in order to elaborate a p+–n junction in 6H–SiC. The chosen techniques were aluminum multiple implantations, followed with high-temperature furnace annealings. First, we had to configure the furnace geometry aiming at optimizing the annealed material characteristics. We evidenced the beneficial effects of a SiC plate inside the furnace reactor on the surface stoichiometry of the annealed sample, and also on its crystal reordering velocity. Then, the fivefold aluminum implantation necessary for the 0.5 μm depth p+-region creation has been studied, especially the energy order influence on the junction steepness. It was found that the increasing energy order implantations lead to a channeling effect less important, a deeper amorphized zone, and a defect interface at volume more abrupt. After an annealing performed with the optimized furnace, the best electrical activation obtained equated the degree of ionization even though the as-implanted material was totally amorphized up to 0.25 μm. Moreover, the three different multiple implantations investigated during this study induced different amorphized layer depths, despite they all have the same total aluminum dose with the same highest energy value. All along the paper, we propose to explain this fact. This is probably due to distinct mechanisms involved in the amorphization phenomena, which were tentatively estimated with a specific Monte Carlo simulator recently developed. 相似文献
104.
Choi Won Yung; Morvan Cecile; Balsam Peter D.; Horvitz Jon C. 《Canadian Metallurgical Quarterly》2009,123(6):1279
Experimentally induced and parkinsonian disruptions in dopamine (DA) transmission are associated with motor abnormalities that include a reduced likelihood of behavioral response initiation and an increased duration of executed responses. Here we investigated the dopamine receptor subtypes involved in regulating these two aspects of behavior. We examined the effects of D1 family (D1/D5) antagonist R(+)-7-chloro-8-hydroxy-3-methyl-1-phenyl-2,3,4,5-tetrahydro-1H-3-benzazepine hydrochloride (SCH23390; 0, 0.04, 0.08, or 0.16 mg/kg) and D2/D3 antagonist 3,5-dichloro-N-(1-ethylpyrrolidin-2-ylmethyl)-2-hydroxy-6-methoxybenzamide (+)-tartrate salt (raclopride; 0, 0.2, or 0.4 mg/kg) on the likelihood and duration of a cued Pavlovian approach and a cued operant lever-press response. While the high doses of the D1 and D2 antagonists produced similar levels of overall locomotor suppression, only the D2 antagonist increased the duration of time that animals’ heads remained in the food compartment during both Pavlovian and operant task performance. In contrast, D1 antagonist SCH23390 decreased the proportion of trials in which animals executed both the Pavlovian approach and operant lever-press, while raclopride did not. The results suggest that D2 receptor blockade preferentially increases response duration, and, under the simple discrete-trial procedures employed here, D1 receptor blockade preferential reduces Pavlovian and operant response likelihood. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
105.
106.
We present a generic low-cost and flexible metropolitan area network optical ring architecture and evaluate its performance using optical transmission simulation software. We describe a specific design method that can be used to extract relevant parameters, such as the ber and osnr for different channels at any ring network node. We show the possibility offered by a personal computer in the physical modeling of a complex system consisting of numerous components with many parameters. The design method that we describe can be considered as an efficient virtual prototyping method, offering cost and timesavings to network planners. 相似文献
107.
Bogdan Ušćumlić Isabella Cerutti Annie Gravey Philippe Gravey Dominique Barth Michel Morvan Piero Castoldi 《Photonic Network Communications》2011,22(3):254-265
To efficiently support the high rate and the high dynamicity of the traffic in metro networks, an optical packet-switched
WDM ring, named ECOFRAME, is proposed. The key features of the proposed ring are optical transparency and statistical multiplexing
of optical packets on parallel WDM channels. Such features can be exploited by properly allocating wavelengths and receivers.
This paper aims to optimally dimension the unidirectional ECOFRAME rings. The dimensioning at minimum cost (i.e., for wavelengths
and receivers) is modeled with an mixed-integer linear programming formulation. An heuristic algorithm is also proposed, and
its performance is compared against the optimal solutions and bounds. When considering the receiver and wavelength cost, results
indicate that trading the wavelengths for receivers allows cost saving of up to 75% with respect to WDM optical packet rings
with a single dedicated wavelength per node (i.e., single receiver at each node). 相似文献
108.
Maud Cansell Tiphaine Bardeau Estelle Morvan Axelle Grélard Corinne Buré Pascale Subra-Paternault 《Journal of the American Oil Chemists' Society》2017,94(9):1219-1223
Camelina, flaxseed, hemp, sesame, and walnut cakes were analyzed for their phospholipid (PL) content and composition using 31P and 1H nuclear magnetic resonance and gas chromatography. The data evidenced variations between the sources in terms of (1) total lipid content and PL concentration, camelina cake being the richest source of PLs, (2) PL composition, phosphatidylcholine being the most abundant phospholipid in sesame and hemp cakes, whereas phosphatidylinositol represented about 25% of the total PLs in most cakes, and (3) fatty acid composition of the PLs, camelina cake being the richest source of omega 3 polyunsaturated fatty acids. These data may be useful to diversify the PL sources available and to provide PL fractions with specific nutritional or functional properties. 相似文献