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排序方式: 共有374条查询结果,搜索用时 343 毫秒
341.
342.
Rainer Hock Hartmut Fuess Thomas Vogt Michel Bonnet 《Zeitschrift für Physik B Condensed Matter》1991,82(2):283-294
The magnetic and crystallographic structure of erbium iron garnet {Er3}[Fe2](Fe3)O12 has been refined simultaneously from powder and single crystal neutron diffraction data. At 5 K the ferrimagnetic structure has a spin direction parallel to [100]. Magnetic moments of iron and erbium and canting angles for the erbium sublattices were derived in space groupI41/acd for 5 K<T<65 K. The magnetic moments of the two erbium sites are 6.9
B
and 4.3
B
at 5 K. An indication of further symmetry reduction of the magnetic structure from tetragonal to orthorhombic below 5 K is discussed. 相似文献
343.
344.
Stphanie Parra Olivier Vitse Vronique Bnzech Carine Deleuze‐Masqufa Guy Subra Jacques Bompart Roger Escale Jean P. Chapat Pierre A. Bonnet 《Journal of heterocyclic chemistry》2001,38(1):41-44
The n‐butyllithium and lithium 2,2,6,6‐tetramethylpiperidide metalation and the halogen‐metal exchange of imidazo[1,2‐a]quinoxaline derivatives followed by quenching with various electrophiles were studied. The reaction conditions have been optimized and various C1 substituted imidazo[1,2‐a]quinoxalines were obtained in high yields. 相似文献
345.
G. Bonnet 《International Journal of Solids and Structures》2009,46(5):1240-1250
Obtaining the Green tensor for the most general orthotropic medium is not generally possible in a closed form because the solution requires the roots of a sextic, often known as Stroh eigenvalues. The paper gives some conditions under which the sextic can be solved in a closed form for any direction within the space. It enables the construction of classes of orthotropic materials for which the Green tensor can be computed in a closed form (closed-form orthotropic or CFO) for any direction within the space. The cases of transversely isotropic, tetragonal and cubic materials are studied as special cases. The comparison between the exact Green function and approximate Green functions obtained from the nearest CFO material (in the sense of four different distances) is finally performed in the case of five examples of elasticity tensors. 相似文献
346.
Trung-Kien Nguyen Karam Sab Guy Bonnet 《European Journal of Mechanics - A/Solids》2009,28(6):1051-1063
This paper presents new bounds for heterogeneous plates which are similar to the well-known Hashin–Shtrikman bounds, but take into account plate boundary conditions. The Hashin–Shtrikman variational principle is used with a self-adjoint Green-operator with traction-free boundary conditions proposed by the authors. This variational formulation enables to derive lower and upper bounds for the effective in-plane and out-of-plane elastic properties of the plate. Two applications of the general theory are considered: first, in-plane invariant polarization fields are used to recover the “first-order” bounds proposed by Kolpakov [Kolpakov, A.G., 1999. Variational principles for stiffnesses of a non-homogeneous plate. J. Meth. Phys. Solids 47, 2075–2092] for general heterogeneous plates; next, “second-order bounds” for n-phase plates whose constituents are statistically homogeneous in the in-plane directions are obtained. The results related to a two-phase material made of elastic isotropic materials are shown. The “second-order” bounds for the plate elastic properties are compared with the plate properties of homogeneous plates made of materials having an elasticity tensor computed from “second-order” Hashin–Shtrikman bounds in an infinite domain. 相似文献
347.
Overview of Identification Methods of Mechanical Parameters Based on Full-field Measurements 总被引:6,自引:1,他引:5
Stéphane Avril Marc Bonnet Anne-Sophie Bretelle Michel Grédiac François Hild Patrick Ienny Félix Latourte Didier Lemosse Stéphane Pagano Emmanuel Pagnacco Fabrice Pierron 《Experimental Mechanics》2008,48(4):381-402
This article reviews recently developed methods for constitutive parameter identification based on kinematic full-field measurements,
namely the finite element model updating method (FEMU), the constitutive equation gap method (CEGM), the virtual fields method
(VFM), the equilibrium gap method (EGM) and the reciprocity gap method (RGM). Their formulation and underlying principles
are presented and discussed. These identification techniques are then applied to full-field experimental data obtained on
four different experiments, namely (i) a tensile test, (ii) the Brazilian test, (iii) a shear-flexural test, and (iv) a biaxial
test. Test (iv) features a non-uniform damage field, and hence non-uniform equivalent elastic properties, while tests (i),
(ii) and (iii) deal with the identification of uniform anisotropic elastic properties. Tests (ii), (iii) and (iv) involve
non-uniform strain fields in the region of interest.
Working group “Identification” of the French CNRS research network (GDR 2519) “Mesures de champs et identification en Mécanique
des Solides / Full-field Measurements and Identification in Solid Mechanics”. 相似文献
348.
Cindy Patinote Kamel Hadj-Kaddour Marjorie Damian Carine Deleuze-Masquéfa Pierre Cuq Pierre-Antoine Bonnet 《Journal of fluorescence》2017,27(5):1607-1611
The fluorescence properties of eleven novel derivatives based on the imidazo[1,2-a]quinoxaline structures have been studied. The absorption and emission spectra of these compounds have been recorded in dimethylsulfoxide solution. The phenyl substituting group on position 1 gives them particular properties thanks to the diverse hydroxy or methoxy decorating moieties, especially when they are multiplied or mixed. The investigated fluorescence auto-quenching revealed that the decreasing fluorescence intensity correlated only with the chemical structures of the aromatic compounds. 相似文献
349.
Vivarès D Belloni L Tardieu A Bonneté F 《The European physical journal. E, Soft matter》2002,9(1):15-25
We present the experimental and theoretical background of a method to characterize the protein-protein attractive potential
induced by one of the mostly used crystallizing agents in the protein-field, the poly(ethylene glycol) (PEG). This attractive
interaction is commonly called, in colloid physics, the depletion interaction. Small-Angle X-ray Scattering experiments and
numerical treatments based on liquid-state theories were performed on urate oxidase-PEG mixtures with two different PEGs (3350
Da and 8000 Da). A “two-component” approach was used in which the polymer-polymer, the protein-polymer and the protein-protein
pair potentials were determined. The resulting effective protein-protein potential was characterized. This potential is the
sum of the free-polymer protein-protein potential and of the PEG-induced depletion potential. The depletion potential was
found to be hardly dependent upon the protein concentration but strongly function of the polymer size and concentration. Our
results were also compared with two models, which give an analytic expression for the depletion potential.
Received 29 April 2002
RID="a"
ID="a"Present address: CRMC2-CNRS, Campus de Luminy, case 913, F-13288 Marseille Cedex 09, France; e-mail: vivares@crmc2.univ-mrs.fr
RID="b"
ID="b"e-mail: bonnete@crmc2.univ-mrs.fr
RID="c"
ID="c"Laboratory associated to Universities Aix-Marseille II and III. 相似文献
350.
New experimental techniques to investigate fluid and plasma flows in a non-intrusive way were presented at the EURO-MECH 260 Colloquium held in Poitiers, France, on September 5–7, 1990. A total of 55 participants from 7 countries attended. Five sessions were organized with 29 oral presentations, each session being opened by an invited lecture. The colloquium was closed by a general discussion. 相似文献