1,721,015 research outputs found
Simplified interpretations of dynamic centrifuge tests on cantilever flexible retaining walls in saturated sands
No full textSome seismic centrifuge tests have been carried out on flexible retaining walls, both cantilever and propped, in sands characterised by different Relative Density, saturated below the dredge level. In the present paper the static and the dynamicbending moment distributions evaluated during the tests are compared with those obtained using simplified limit equilibrium models, both using the classical approach both taking also into account the effect of Relative Density of the sand and the role of suction in the unsaturated part of the subsoil. The paper stresses the fundamental role of such details in the interpretation of this kind of tests
Best constants in Sobolev inequalities for functions vanishing on some part of the boundary and related questions
No full textOn the dynamic JKR adhesion problem
No full textShui et al. (2020) have recently shown that applying high-frequency vibrations, we can increase the mean adhesion between viscoelastic solids. This is due to the fact that oscillating contact area leads to an effect of increased apparent surface energy during the retraction phase which can be described by the well known empirical Gent and Schultz law (GS). However, Shui et al solution surprisingly appears not to depend on GS constants, which would imply perhaps no amplification. Yi et al. (2024) have made similar experiments, and proposed a simpler fitting model, which seems to work however with widely different GS constant when changing the sphere radius. Here, we solve the JKR dynamic adhesion problem for a sphere oscillating on a substrate by imposing an harmonic oscillation of the contact area, which permits to obtain a very simple solution by simply averaging the resulting cycle of indentation. We find that the solution is close to a JKR form for the mean indentation vs mean force, which we find in a simple approximation. Although there is saturation in the amplification when the contact radius shrinks to zero and the problem becomes that of impacts at large amplitudes of vibrations, experiments show that other saturations occurs first, presently unclear. We discuss also the influence of resonances. We find reasonable agreement with experiments conducted on PDMS
Poudret (J.-F), avec la collaboration de Valazza Tricarico (M.-A.). Coutumes et coutumiers. Histoire comparative des droits des pays romands du XIIIe à la fin du XVIe siècle.
No full textGodding Philippe. Poudret (J.-F), avec la collaboration de Valazza Tricarico (M.-A.). Coutumes et coutumiers. Histoire comparative des droits des pays romands du XIIIe à la fin du XVIe siècle. . In: Revue belge de philologie et d'histoire, tome 81, fasc. 2, 2003. Histoire medievale, moderne et contemporaine - Middeleeuwse. moderne en hedendaagse geschiedenis. pp. 525-526
I poligoni: dai mosaici dell’Alhambra alle incisioni di Escher
No full textDescrizione delle attività svolte durante l'omonimo laboratorio tenuto per il PLS matematica nell'anno 201
Variazioni diurne della vigilanza valutate da un Test di Cancellazione di Lettere (TCL): effetti del carico attentivo e della durata del compito
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Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
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