Search results for "Rut"
showing 10 items of 2295 documents
Coupled VEM–BEM Approach for Isotropic Damage Modelling in Composite Materials
2023
Numerical prediction of composite damage behaviour at the microscopic level is still a challenging engineering issue for the analysis and design of modern materials. In this work, we document the application of a recently developed numerical technique based on the coupling between the virtual element method (VEM) and the boundary element method (BEM) within the framework of continuum damage mechanics (CDM) to model the in-plane damage evolution characteristics of composite materials. BEM is a widely adopted and efficient numerical technique that reduces the problem dimensionality due to its underlying formulation. It substantially simplifies the pre-processing stage and decreases the compu…
Fast Hierarchical Boundary Element Method for Large Scale 3-D Elastic Problems
2010
This chapter reviews recent developments in the strategies for the fast solution of boundary element systems of equations for large scale 3D elastic problems. Both isotropic and anisotropic materials as well as cracked and uncracked solids are considered. The focus is on the combined use the hierarchical representation of the boundary element collocation matrix and iterative solution procedures. The hierarchical representation of the collocation matrix is built starting from the generation of the cluster and block trees that take into account the nature of the considered problem, i.e. the possible presence of a crack. Low rank blocks are generated through adaptive cross approximation (ACA) …
Structural Health Monitoring of delaminated composite structures by the Boundary Element method
2012
Structural Health Monitoring (SHM) for composite materials is becoming a primary task due to their extended use in safety critical applications. Different methods, based on the use of piezoelectric transducers, strain memory alloys as well as of fibre optics, has been successfully proposed to detect and monitor damage in composite structural components with particular attention focused on delamination cracks. In the present paper a Structural Health Monitoring model based on the use of piezoelectric sensors, already proposed by the authors for isotropic damaged components, is extended to delaminated composite structures. The dynamic behavior of the host damaged structure and the bonded piez…
A HYBRID VEM/BEM NUMERICAL TECHNIQUE FOR SIMULATING DAMAGE IN COMPOSITE MATERIALS
2021
Composite materials are nowadays widely used in the aerospace sector both for primary and secondary structures for their high mechanical properties and the ability to model them according to project needs. Therefore, accurately predicting material behaviour when subjected to operating loads is extremely important in making the design process more efficient. For this purpose, computational approaches based on continuum damage mechanics have been largely used to study the progressive loss of material integrity due to the propagation and coalescence of microscopic defects. In this contribution, a recently developed hybrid computational technique, which combines the Virtual Element Method (VEM)…
Application of dual boundary element method in active sensing
2013
In this paper, a boundary element method (BEM) for the dynamic analysis of 3D solid structures with bonded piezoelectric transducers is presented. The host structure is modelled with BEM and the piezoelectric transducers are formulated using a 3D semi-analytical finite element approach. The elastodynamic analysis of the entire structure is carried out in Laplace domain and the response in time domain is obtained by inverse Laplace transform. The BEM is validated against established finite element method (FEM).
Characterization of Brassica fruticulosa seeds
2009
The structure and vitamin E (tocopherol and tocotrienol), fatty acid and phytosterol content and composition of seeds of Brassica fruticulosa Cyr. (Brassicaceae) were characterized. Seed size and elevated content of γ-tocotrienol, and γ- tocopherol and low of α- tocopherol can be useful for distinguishing seeds of B. fruticolosa from those of Sicilian Brassica sect. Brassica. The concentration of the tocotrienol is about one third of the vitamin E content. This profile makes this wild species worth to be recovered as food source and its germplasm preserved in a gene bank.
First M87 Event Horizon Telescope Results. IV. Imaging the Central Supermassive Black Hole
2019
We present the first Event Horizon Telescope (EHT) images of M87, using observations from April 2017 at 1.3 mm wavelength. These images show a prominent ring with a diameter of ~40 μas, consistent with the size and shape of the lensed photon orbit encircling the "shadow" of a supermassive black hole. The ring is persistent across four observing nights and shows enhanced brightness in the south. To assess the reliability of these results, we implemented a two-stage imaging procedure. In the first stage, four teams, each blind to the others' work, produced images of M87 using both an established method (CLEAN) and a newer technique (regularized maximum likelihood). This stage allowed us to av…
Brutalismo: 4 taglie
2007
Limitandosi a vedere questo ampio argomento solo in relazione all’opera di Artigas, si propone di definire la nozione di Brutalismo in 4 diverse taglie. Il cliché storiografico ci propone usualmente una taglia ridotta (small) che vede il brutalismo come un “movimento omogeneo internazionale connotato dall’uso del cemento armato a faccia vista”. Diversi apporti recenti o tentativi di riscontro effettuati personalmente ci inducono ad utilizzare quantomeno una definizione più critica e problematica (medium) dove atteggiamenti, tendenze e azioni sono spesso anche contaddittori. Le reali adesioni al movimento londinese, il ruolo dei fotografi, i rapporti tra brasiliani ed europei sono in questo …
Televīzijas reklāmas ētika: vardarbības un brutalitātes manifestācijas televīzijas reklāmās analīze
2017
Bakalaura darba nosaukums „Televīzijas reklāmas ētika: vardarbības un brutalitātes manifestācijas televīzijas reklāmās analīze”. Par pētījuma objektu izvēlētas divas sociālās reklāmas kampaņas: 1) Valsts bērnu tiesību aizsardzības inspekcijas (VBTAI) kampaņa "Pārtrauc klusēšanu!" un 2) Ceļu Satiksmes Drošības Direkcijas (CSDD) reklāma „Pierādi sevi citur nevis uz ceļa” audiovizuālā satura rullīši. Darbā izvirzītais mērķis ir noskaidrot abu reklāmas kampaņu audiovizuālo vēstījumu, apskatot izmantotos un neaizmantotos vardarbības un brutalitātes semiotiskos kodus, kā arī noskaidrot pētījumā iesaistīto cilvēku reakciju uz abām reklāmas kampaņām. Pētījumā apskatītas teorijas par reklāmas ētiku …
Recensione a AA.VV., Le Brutus de Cicéron. Rhétorique, politique et histoire culturelle, sous la direction de Sophie Aubert-Baillot &Charles Guérin, …
2015
Recensione