1,722,300 research outputs found
Microscopical justification of the Winterbottom problem for well-separated lattices
No full textWe consider the discrete atomistic setting introduced in Piovano and Velcic (2022) to microscopically justify the continuum model related to the Winterbottom problem, i.e., the problem of determining the equilibrium shape of crystalline film drops resting on a substrate, and relax the rigidity assumption considered in Piovano and Velcic (2022) to characterize the wetting and dewetting regimes and to perform the discrete to continuum passage. In particular, all results of Piovano and Velcic (2022) are extended to the setting where the distance between the reference lattices for the film and the substrate is not smaller than the optimal bond length between a film and a substrate atom. Such optimal film-substrate bonding distance is prescribed together with the optimal film-film distance by means of two-body atomistic interaction potentials of Heitmann-Radin type, which are both taken into account in the discrete energy, and in terms of which the wetting-regime threshold and the effective expression for the wetting parameter in the continuum energy are determined
Existence of minimizers for the SDRI model in 2d: wetting and dewetting regime with mismatch strain
Full text linkThe model introduced in [Kholmatov-Piovano 2020] in the framework of the
theory on Stress-Driven Rearrangement Instabilities (SDRI) [Asaro-Tiller 1972;
Grinfeld 1993} for the morphology of crystalline materials under stress is
considered. As in [Kholmatov-Piovano 2020] and in agreement with the models in
[Lowengrub et al. 2009; Spencer 1999], a mismatch strain, rather than a
Dirichlet condition as in [Crismale-Friedrich 2020], is considered to include
into the analysis the lattice mismatch between the crystal and possible
adjacent (supporting) materials. The existence of solutions is established in
dimension two in the absence of graph-like assumptions and of the restriction
to a finite number of connected components for the free boundary of the
region occupied by the crystalline material, thus extending previous results
for epitaxially strained thin films and material cavities. Due to the lack of
compactness and lower semicontinuity for the sequences of -minimizers, i.e.,
minimizers among configurations with at most connected boundary components,
a minimizing candidate is directly constructed, and then shown to be a
minimizer by means of uniform density estimates and the convergence of
-minimizers' energies to the energy infimum as . Finally,
regularity properties for the morphology satisfied by every minimizer are
established.Comment: 52 pages, 1 figure
Piovano Arlotto Facezie
No full textscheda bibliografica di rara edizione veneziana cinquecentesca delle Facezie del Piovano Arlotto finora sconosciut
Bormio / Mappatori Ajut.te topog.o Alessio, Ajut.te topog.o Palmarocchi, F., Tenente Piovano, Tenente Pauer, Ajut.te topog.o Palmarocchi V., Asp.te Ajut.te Marchi P., Capo Sezione Capitano Giorgetti
No full textBORMIO / MAPPATORI AJUT.TE TOPOG.O ALESSIO, AJUT.TE TOPOG.O PALMAROCCHI, F., TENENTE PIOVANO, TENENTE PAUER, AJUT.TE TOPOG.O PALMAROCCHI V., ASP.TE AJUT.TE MARCHI P., CAPO SEZIONE CAPITANO GIORGETTI
[Carta d'Italia] (-)
Bormio / Mappatori Ajut.te topog.o Alessio, Ajut.te topog.o Palmarocchi, F., Tenente Piovano, Tenente Pauer, Ajut.te topog.o Palmarocchi V., Asp.te Ajut.te Marchi P., Capo Sezione Capitano Giorgetti (F.o 8 2) ( -
Cuantificadores preposicionales en el español argentino
Full text linkFil: Piovano, Luisina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
Nombres propios y valoración en el español de la Argentina
No full textFil: Piovano, Luisina. Instituto de Humanidades y Ciencias Sociales; Argentina
‘Motti, bufonerie et burle’ del Piovano Arlotto
No full textEstudio de la obra del año 1568 encontrada en la Biblioteca Histórica de la Universidad de Salamanca, y que se centra en torno a tres aspectos fundamentales: La Questione della Lingua, la Vita del Piovano Arlotto siguiendo la introducción de la obra, y la traducción y análisis de uno de los hechos y dichos atribuidos al autor
Evolution of elastic thin films with curvature regularization via minimizing movements
Full text linkARAMBURU SÁNCHEZ, Celia (USAL). ‘Motti, bufonerie et burle’ del Piovano Arlotto.
No full textStudy this literary work of 1568, found in the Historical Library of the University of Salamanca. The study is focused on three main aspects: The ‘Questione della Lingua’, the ‘Vita of Piovano Arlotto’ following the introduction of the work, and the translation and analysis of one of facts and sayings attributed to Piovano Arlotto.Estudio de la obra del año 1568 encontrada en la Biblioteca Histórica de la Universidad de Salamanca, y que se centra en torno a tres aspectos fundamentales: La Questione della Lingua, la Vita del Piovano Arlotto siguiendo la introducción de la obra, y la traducción y análisis de uno de los hechos y dichos atribuidos al autor
Combined finite-discrete element modelling of key instabilities which characterise deep-seated landslides from massive rock slope failure
Full text linkThe expression “landslide from massive rock slope failure” (MRSF) is used to indicate large-scale landslides characterised by a variety of complex initial failure processes and unpredictable postfailure behaviour. In this context, deep-seated landslides are classified as “landslides from massive rock slope failure”. Typically, deep-seated landslides are slow mountain deformations which may involve movement along discrete shear surfaces and deep seated mass creep.
The long-term development of deep-seated slope deformations creates suitable conditions for the subsequent occurrence of other slope deformations. Deep-seated landslides in mountain areas can be spatially interconnected with other types of slope deformations such as debris flows, debris slides, rock avalanches, topple, translational, rotational and compound sliding and complex type of mass movements.
It is to be recognized that many aspects of large-scale landslides need be investigated in order to gain the necessary confidence in the understanding and prediction of their behaviour and in the associated risk assessment. The present thesis is to contribute to such understanding with specific reference to a number of mass movements which characterize large-scale landslides.
An advanced numerical technique (FDEM) which combines finite elements with discrete elements has been applied in this thesis for improving such understanding. The open source research code, called Y2D, developed at the Queen Mary, University of London by Prof. Munjiza has been used. Considering that this code has not yet been applied to slope stability problems, a series of numerical tests have been carried out to assess its suitability to properly and efficiently simulate geomechanical problems.
To this purpose standard rock failure mechanisms as well as laboratory tests have been modelled first and the results obtained have been compared with available analytical and numerical solutions. The advantages of the application of FDEM has been outlined by showing that both the simulation of failure initiation and progressive development to fragmentation of the rock mass is possible as this is deposited at the slope toe. The case study of interest for this thesis is the Beauregard massive landslide located in the Aosta Valley (Northwestern Italy). At this site the presence of an extensive deep-landslide insisting on the left abutment of an arch-gravity dam is well recognised.
Based on detailed studies, the investigated area has been subdivided into zones which are characterised by different geomorphologic and geostructural features. Different landslide mechanics as well as different landslide activities upstream of the dam site have been identified and studied in detail.
Such an area is thought to be at an intermediate stage of development of the deep seated landslide compared with the sector which insists on the dam. The observed failure mechanism has been ascribed to a large sliding on a compound surface. Some other failure mechanisms have been recognized, such as large flexural toppling and local block toppling instability.
The final part of the thesis has been devoted to the FDEM numerical modelling of a large scale failure mechanism based on brittle behaviour of the rock mass. The aim is to apply the “total slope failure” approach through the application of FDEM. Such a technique has demonstrated the significant potential in predicting the development of possible slope instability phenomena
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