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  • 1
    Electronic Resource
    Electronic Resource
    Ionic conduction in (PEO)"nKCu"xI"1" "+" "x complexes
    Amsterdam : Elsevier
    Electrochimica Acta 37 (1992), S. 1599-1601 
    Details
    ISSN: 0013-4686
    Keywords: conductivity ; copper(I) complex ; polymer electrolytes ; transference number
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0013-4686(92)80119-7
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  • 2
    Electronic Resource
    Electronic Resource
    Molecular catalysts in photoelectrochemical cells - Study of an efficient system for the selective photoelectroreduction of CO"2: p-GaP or p-GaAs/Ni(cyclam)^2^+, aqueous medium
    Amsterdam : Elsevier
    Journal of Electroanalytical Chemistry 269 (1989), S. 267-281 
    Details
    ISSN: 0022-0728
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0022-0728(89)85137-X
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  • 3
    Electronic Resource
    Electronic Resource
    Photoassisted electro-reduction of CO"2 on p-GaAs in the presence of Ni cyclam^2^+
    Amsterdam : Elsevier
    Journal of Electroanalytical Chemistry 206 (1986), S. 333-339 
    Details
    ISSN: 0022-0728
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0022-0728(86)90281-0
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  • 4
    Electronic Resource
    Electronic Resource
    On the convergence of standard and damped least squares methods
    Amsterdam : Elsevier
    Journal of Computational Physics 22 (1976), S. 534-542 
    Details
    ISSN: 0021-9991
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Computer Science , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/0021-9991(76)90048-6
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  • 5
    Electronic Resource
    Electronic Resource
    Path and kinetics of branching from defects under uniaxial and biaxial compressive loading (1992)
    Springer
    International journal of fracture 54 (1992), S. 139-163 
    Details
    ISSN: 1573-2673
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract In order to understand the physical significance of branching features, especially path and kinetics, formed from defects in confined geological or mining conditions, a set of branch fractures obtained under uniaxial and biaxial loading at the tip of an isolated pre-existing oblique open slot was studied in PMMA (polymethylmethacrylate) plates. It was found that the branching always initiated perpendicular to the local plane tangent to the slot edge at the branch crack root while the branch crack root-crack tip distance increased with the slot-loading axis angle; the influence of biaxial loading is also discussed. The study of the stress field linked to an elliptical slot under shear conditions confirms these experimental observations and predicts the influence of the radius of curvature at the crack tip on the branching distance. The conditions of propagation are studied in terms of strain energy release rate along the stress trajectory starting from the point of maximum tensile stress at the slot edge, taking into account the presence of microcracks stemming from the slot tip induced by the sawing method. This allows one to describe the three successive régimes of propagation of the branch crack: spontaneous, catastrophic and controlled ruptures, according to the intensity of the applied compressive uniaxial stress and the size of pre-existing microcracks at the edge of the open slot. The computed variation of the branch crack length versus time agrees well with our experimental observations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00028916
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  • 6
    Electronic Resource
    Electronic Resource
    Stress drop and contact stiffness measured from stick-slip experiments on PMMA-PMMA friction (1999)
    Springer
    Tribology letters 7 (1999), S. 61-65 
    Details
    ISSN: 1573-2711
    Keywords: stick-slip ; contact stiffness ; stress drop ; roughness ; interlocking ; PMMA ; static coefficient of friction
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract We present results from an extensive stick-slip study on PMMA-PMMA dry friction, where we studied the influence of a wide range of normal stresses, loading velocities and roughnesses of the sliding surfaces. In this paper we focus (a) on the analysis of a residual coefficient of friction, i.e., shear stress measured at the end of the slip phase divided by the corresponding normal stress, and (b) on the contact stiffness measured by plotting the relative displacement between sample against the shear stress during the stick phase. It is shown that the residual coefficient of friction (i) decreases as normal stress increases, (ii) shows a slight increase when the roughness of the sliding surfaces increases and (iii) does not vary according to the loading velocity. The contact stiffness proved independent of loading conditions and of the roughness of the sliding surfaces. These results are interpreted in terms of asperity interlocking.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1019152832763
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  • 7
    Electronic Resource
    Electronic Resource
    Quasi-adiabatic shear zones in the lithosphere: numerical and experimental approaches (1999)
    Springer
    Visual geosciences 4 (1999), S. 1-14 
    Details
    ISSN: 1610-2924
    Keywords: Fault nucleation ; Visualization ; Thermal coupling ; Experimental and numerical modeling ; Plasticity theory
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract Continental breakup, or compressive lithosphere scale faulting, requires a physical mechanism for wholesale faulting of the lithosphere. We compared numerical and experimental models for the nucleation of quasi-adiabatic shear bands in polyvinylchloride (PVC) with those in an idealized viscoelastoplastic mantle with olivine rheology. In both materials fault nucleation is caused by elastic stress concentration on pre-existing imperfections, with localized yielding confined to its vicinity. Faulting occurs rapidly after the initial elastic energy in the system is charged sufficiently to cause wholesale yielding. Propagation of the fault, monitored by looking at the dissipation of plastic energy, reveals migration of a sharp, thermal-mechanical “crack”- like instability, which appears in the temperature field as a slightly diffused signal. The initial temperature rise in the crack is subtle but increases suddenly when the plate is severed. This autocatalytic behavior has also been described in ductile polymers, which can be used as mechanical analogues. We suggest that elastoplastic coupling in quasi-adiabatic shear banding is a key for fast (〈 1 Ma) nucleation of shear zones. These nonlinear phenomena will be illustrated for both experimental and numerical results by nine movies
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s10069-999-0002-x
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  • 8
    Electronic Resource
    Electronic Resource
    Résolution de l'équation de bilan-matière d'une colonne chromatographique (1978)
    Springer
    Chromatographia 11 (1978), S. 287-294 
    Details
    ISSN: 1612-1112
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Résumé L'étude de la résolution de l'équation du bilan-matière d'une colonne chromatographique est présentée. Une solution numérique est proposée pour un isotherme d'adsorption parabolique dans le cas de fortes courbures. Une solution numérique, basée sur une méthode de discrétisation, a été également mise au point pur les isothermes d'adsorption de forme quelconque.
    Notes: Summary The study of the solution of the mass balance equation for a chromatographic column is presented. A numerical solution is proposed for a parabolic adsorption isotherm with high curvature. A numerical solution, based on calculations of derivatives from data at discrete intervals, has also been developed for the general form of the adsorption isotherm. The influence of isotherm curvature and of the mass transfer coefficient on the form of chromatographic peaks is then shown.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02282955
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  • 9
    Electronic Resource
    Electronic Resource
    Mécanisme de solvolyse des cis- et trans-(p-toluènesulfonates) d'aryl-2-cyclopentyle I. Etude de la première étape de la solvolyse: effets isotopiques de l' atone de deutérium en position 2, effets de sel basique et effet spécial de sel (1988)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 71 (1988), S. 648-657 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Solvolysis Mechanism of cis - and trans-2-Arylcylopentyl p-Toluenesulfonates. The Step: 1-Deuterium Isotope Effects, Basic Salt Effects, and Special Salt EffectWe have studied the first step of the solvolysis of cis and trans-2-arylcyclopentyl p-toluenesulfonates in HCOOH, AcOH, and EtOh. All substrates show a high kinetic 1-deuterium isotope effect (kH/kD(1) 〉1.15). This fact indicates that first step leads to classical intimate ion-pair Which dissociates to a solvet-separated ion-pair, without participation either of solvent, the 2-aryl group, or a H-atom at C(2). The slight influence of added basic ions on reaction rate allows us to exclude any direct solvent attack on the covalent substrate even in the most favorable case, i.e. ethanolysis of 2-(p-nitrophenyl)cylopentyl-p-toluenesulfonates. Furthermore, solvent-separated ion pair formation is indicated by the special salt effect induced by LiClO4.
    Notes: No abstract.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19880710319
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  • 10
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    The mechanics of fault distribution and localization in high-porosity sands, Provence, France (2007)
    In:  Geological Society Special Publication 289: 19-46.
    Details
    Publication Date: 2007-11-05
    Description: Excellent quarry exposures have been studied to examine the controls on the growth of fault networks in Cretaceous high-porosity sands. An inverse correlation is found at any one locality between the frequency of faults of an earlier tectonic event and the frequency of later faults. The early faults are cataclastic deformation bands with displacements typically up to 300 mm, and have thicknesses approaching their displacements. Later faults are also deformation bands except where present within a high-frequency array of earlier faults, where they are typically clustered high-displacement ultracataclasite zones that are narrower (smaller width/displacement ratios) than for the deformation band faults. A mechanical model using critical state soil mechanics explains the observed distributions and fault zone characteristics in terms of strength changes in the deforming sand unit and the stress path by which the material is subjected to clastic'plastic yielding. Localized faulting by constant-volume cataclastic flow at the critical state line will result in deviatoric stress reduction as Coulomb plasticity softening occurs within the fault zone. Elastic unloading of the walls will suppress the continued formation of deformation bands. The point at which the stress state reaches the critical state line, governed by the stress state and position of the clastic'plastic yield envelope, is therefore crucial in controlling the final distribution of deformation bands and larger faults in the system. Within this framework, the field and microstructural data suggest that earlier deformation became distributed by hardening processes such as compaction and grain-size reduction, resulting in a higher bulk yield strength. In a later tectonic event, the unit behaves in a stronger manner and deformation quickly localizes by fault zone softening processes into fewer fault zones that individually grow larger.
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