Search results for "cost"
showing 10 items of 5421 documents
An Interface Model for the Analysis of Anisotropy of Friction and Wear of Contact Surfaces
2008
Effective reference and current integration for large displacement interface
2016
The most common interface formulations proposed in literature are generally based on the restrictive hypothesis of small strains and small displacements and, even though their application to geometrically nonlinear problems is of paramount interest, only few contributions are available in literature. Motivations are probably due to the difficulties encountered on such formulation, as already mentioned by several authors. A pioneering formulation is the finite displacement three-dimensional interface developed by Ortiz and Pandolfi in [1], where normal and tangential traction components are evaluated with respect to the middle surface in the current configuration, producing a non-symmetric g…
Interface model for the nonlinear analysis of blocky structures of ancient Greek temples
2010
The presence of singularity surfaces with reference to the displacement field is a characteristic of a number of structural systems. Strong discontinuities are present in old masonry structures where dry joints connect the blocks or the mortar ageing suggests to neglect the adhesion properties. These structures cannot be considered a continuum but rather an assembly of blocks. These discontinuous structures could be modelled as an assembly of blocks interacting trough frictional joints whose mechanical behaviour is described by appropriate interface laws. In the present work an interface model present in literature is adopted, the double asperity model, which has been implemented in a stand…
The interphase elasto-plastic damaging model applied to masonry structures
2012
Heterogeneous structures studied by interphase elasto-damaging model.
2011
For all structures that are constituted by heterogeneous materials, the meso-modelling approach is the most rigorous since it analyzes such structures as an assembly of distinct elements connected by joints, the latter commonly simulated by apposite interface models. In particular, the zero-thickness interface (ZTI) models are extensively used in those cases where the joint thickness is small if compared to the other dimensions of the heterogeneosu material. In ZTI models the constitutive laws relate the contact tractions to the displacement discontinuities at the interface, but in many cases the joint response depends also on internal stresses and strains within the bulkmaterial. In this s…
Diritti e interpretazione. Il ragionamento giuridico nello Stato costituzionale
2010
Il libro illustra gli effetti che il discorso dei diritti produce sull’argomentazione giuridica. Negli ordinamenti giuridici costituzionalizzati il giurista sembra aver definitivamente dismesso l’abito del mero esegeta dei testi di legge (ereditato dalla tradizione culturale del positivismo legalista ottocentesco), per assumere un ruolo attivo di promozione e attuazione dei diritti fondamentali e dei valori costituzionali. La centralità dei diritti fondamentali contribuisce a rimodulare i rapporti fra potere legislativo e potere giudiziario, talora anche in termini di concorrenza reciproca, e nelle corti trovano posto nuove tecniche argomentative che sembrano avvicinare il ragionamento giur…
Las prerrogativas de estatus y el libre ejercicio de la actividad parlamentaria en la experiencia italiana: historia reciente de una búsqueda incesan…
2021
Las prerrogativas parlamentarias son institutos necesarios para asegurar el equilibrio entre los poderes constitucionales, aunque no pueden ser entregados a la «total y exclusiva» decisión parlamentaria ni a la jurisdicción ordinaria porque, de lo contrario, podrían producir abusos y fuertes interferencias en el ejercicio de las atribuciones que corresponden al Parlamento o al poder judicial. En la experiencia italiana, la Corte Constitucional ha asumido un papel «arbitral» en los conflictos relacionados con las prerrogativas parlamentarias (el juicio por conflicto de atribuciones entre poderes del Estado y el juicio de legitimidad constitucional de las leyes en vía incidental). Sin embargo…
Pressure-Induced Deformation of Pillar-Type Profiled Membranes and Its Effects on Flow and Mass Transfer
2019
In electro-membrane processes, a pressure difference may arise between solutions flowing in alternate channels. This transmembrane pressure (TMP) causes a deformation of the membranes and of the fluid compartments. This, in turn, affects pressure losses and mass transfer rates with respect to undeformed conditions and may result in uneven flow rate and mass flux distributions. These phenomena were analyzed here for round pillar-type profiled membranes by integrated mechanical and fluid dynamics simulations. The analysis involved three steps: (1) A conservatively large value of TMP was imposed, and mechanical simulations were performed to identify the geometry with the minimum pillar density…
Solai ad orditura metallica. Per una storia della costruzione
2016
Sommario: Il saggio approfondisce gli aspetti storici e costruttivi dei solai ad orditura metallica dalla fine del XVIII secolo all’ultima guerra. Dopo una parte generale in cui vengono delineate le motivazioni e le fasi iniziali dell’uso dei materiali ferrosi in edilizia, si traccia ed analizza una serie di linee evolutive della trave metallica, fino al raggiungimento della sezione a doppio T che, a pieno titolo, si considera il punto di arrivo della ricerca sulla forma più conveniente per evidenti motivi di efficienza statica, pur coi successivi affinamenti nella produzione, nel calcolo e nella messa in opera. Si è ipotizzata l’evoluzione attraverso le strade della combinazione legno-ferr…