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B. Yahiaoui A. Gharbi M. Kléman J. Malthête 《The European Physical Journal B - Condensed Matter and Complex Systems》1998,5(1):99-110
Electron microscopy observations of replicas of freeze-fractured samples of two columnar hexagonal phases of different nature (a lyotropic one, the inverse AOT in water; a thermotropic one, ) yield very different results: most defects at microscopic scales are screw dislocations in the lyotropic phase, longitudinal
edge dislocations in the thermotropic phase. A possible way to interpret these differences is as follows: in the lyotropic
the Lamé coefficients and μ and the bend modulus K3 would not display any anomaly compared to expected values; in the thermotropic the shear modulus μ would be ten times smaller
than the compressibility modulus , while K3 would still be comparable to (but larger than) the bend modulus of a small molecules liquid crystal. We present an elementary
theoretical model of the latter case which could explain the anomalous measurements of K3 and of the longitudinal compressibility (Ref. [#!ref10!#]) without contradicting more recent measurements of (Refs. [#!ref17!#,#!ref22!#]). Essentially, the hexagonal phase would be a phase with defects (longitudinal dislocations) akin to an hexatic phase but with some differences.
Re?u : 26 mai 1997 / Révisé : 20 Janvier 1998 /
Accepté : 27 avril 1998 相似文献
84.
We study some characterizations of inner product spaces given in the literature. Among other things, we give an example showing that one of the characterizations given in the classical book of Amir (1986) is not correct. 相似文献
85.
N. Ghaouar M. Ben Henda A. Aschi A. Gharbi 《Journal of Macromolecular Science: Physics》2013,52(11):2150-2164
The self-assembly behaviour of poly(ethylene oxide)-b-poly(propylene oxide)-b-poly (ethylene oxide) copolymers, (EO)13(PO)30(EO)13 (Pluronic L64), and (EO)70 (PO)30(EO)70 (Pluronic F68) in water and in p-xylene has been elucidated by using viscosity and dynamic light scattering measurements to investigate the effects of hydrophilic chains length on their conformational changes. The viscosity measurements were performed for a range of temperature varying from 27°C to 60°C and concentration from 4 to 60 mg/ml. The variation of the viscosity and the conformational changes in aqueous solution depends on the kinds of interactions and the balance between excluded volume effects and hydrophobic interactions. Some dynamic light scattering measurements were also performed at room temperature for the same range of concentration to provide more information on the micellar structures in aqueous and organic solution. 相似文献
86.
Anis Gharbi Talel Ladhari Mohamed Kais Msakni Mehdi Serairi 《European Journal of Operational Research》2013
The two-machine flowshop environment with sequence-independent setup times has been intensely investigated both from theoretical and practical perspectives in the scheduling literature. Nevertheless, very scant attention has been devoted to deriving effective lower bounding strategies. In this paper, we propose new lower bounds for the total completion time minimization criterion. These bounds are based on three relaxation schemes, namely the waiting time-based relaxation scheme, the single machine-based relaxation scheme, and the Lagrangian relaxation scheme. Extensive computational study carried on instances with up to 500 jobs reveals that embedding the waiting time-based bounding strategy within the Lagrangian relaxation framework yields the best performance while requiring negligible CPU time. 相似文献
87.
Bensouilah Rahma Olivet Lilian Hammedi Tijani Pronier Stéphane Barbier Jacques Fontaine Céline Ghorbel Abdelhamid Ksibi Zouhaier 《Research on Chemical Intermediates》2021,47(2):813-834
Research on Chemical Intermediates - Formaldehyde has been successfully converted into CO2 and H2O at low temperature in the presence of CeO2x–TiO2(100?x) mixed oxides prepared by the... 相似文献
88.
89.
Soussi Siwar Essid Rym Hardouin Julie Gharbi Dorra Elkahoui Salem Tabbene Olfa Cosette Pascal Jouenne Thierry Limam Ferid 《Applied biochemistry and biotechnology》2019,187(4):1460-1474
Applied Biochemistry and Biotechnology - An endophytic Bacillus amyloliquefaciens strain called C5, able to produce biosurfactant lipopeptides with a broad antibacterial activity spectrum, has been... 相似文献
90.
We present a simple dynamical model which describes the time dependence of the threshold electric field for breaking the surface anchoring of nematics. This model includes a surface friction, resulting from volume hydrodynamic dissipation. Experimental data with AC and DC pulsed fields are explained by this model. For DC, the threshold difference versus the field polarity is well-described by the flexo-electric effects in a uniform field for short times and in a non-uniform field for long times. 相似文献