368 research outputs found
A new meshless approach for subject-specific strain predictionin long bones: Evaluation of accuracy
No full textThe Finite Element Method is at present the method of choice for strain prediction in bones from Computed Tomography
data. However, accurate methods rely on the correct topological representation of the bone surface, which requires a massive operator
effort, thus restricting their applicability to clinical practice. Meshless methods, which do not rely on a pre-defined topological
discretisation of the domain, might greatly improve the numerical process automation, but currently their application to biomechanics
is negligible.
A meshless implementation of an innovative numerical approach based on a direct discrete formulation of physical laws,
the Cell Method, was developed to predict strains in a cadaver femur from Computed Tomography data. The model accuracy was estimated
by comparing the predicted strains with those experimentally measured on the same specimen in a previous study. As a reference,
the results were compared to those obtained with a state-of-the-art finite element model.
Findings. The Cell Method meshless model predicted strains highly correlated with the experimental measurements (R2 = 0.85) with a
good global accuracy (RMSE = 15.6%). The model performed slightly worse than the finite element one, but this was probably due to
the need to sub-sample the original data, and the lower order of the interpolation used (linear vs parabolic).
Although there is surely room for improvement, the accuracy already obtained with this meshless implementation of
the Cell Method makes it a good candidate for some clinical applications, especially considering the full automation of the method,
which does not require any data pre-processing.
2008 Elsevier Ltd. All rights reserved
Cell Method and Related Meshless Methods
No full textCOMPUTER MODELING IN ENGINEERING & SCIENCES CMES Vol. 94, No. 4, 2013
ISSN: 1526-1492 (print)
ISSN: 1526-1506 (on-line)
Special Issue of Cell Method
organized by Professor Elena Ferretti
CONTENTS
The Cell Method: Quadratic Interpolation with Tetrahedra for 3D Scalar Fields
Martino Pani, Fulvia Taddei . . . . . . . . . . . . . . . . . . . . . . . . . 279
Soft Core Plane State Structures Under Static Loads Using GDQFEM and Cell
Method
E. Viola, F. Tornabene E. Ferretti and N. Fantuzzi . . . . . . . . . . . . . 301
GDQFEM Numerical Simulations of Continuous Media with Cracks and Discontinuities
E. Viola, F. Tornabene E. Ferretti and N. Fantuzzi . . . . . . . . . . . . . 33
Costricted
No full textNell’osservare l’affascinante fase di preparazione del pane, in cui mani e corpo comprimono e lavorano la massa, perpetuando pieghe su pieghe, ed usando il taglio come ulteriore mezzo per conferire disegno e carattere ai diversi pani, ma soprattutto riflettendo sulle forze che si contrastano nella cottura, è nata l’idea di “Costricted”.
Una forma di pane che tiene conto delle tradizioni italiane di panificazione mettendo in risalto, attraverso la lavorazione con pieghe, la massa, ma che allo stesso tempo, con l’introduzione di corde per uso alimentare annodate, viene “costretta” in alcune parti proprio nella sua fase di maggiore espansione: la cottura. Una tecnica utilizzata nell’affine settore degli insaccati e che consente, per esempio, di utilizzare le corde per la presa ed il trasporto – eliminando il packaging – o anche di offrirsi come interfaccia per legare etichette di tracciabilità – senza attaccarle direttamente al pane – o di agganciare altri pani o altri alimenti – il companatico.
Una metafora quella della “costrizione” che trova oggi, più che mai, rispondenza in azioni e contesti umani, in cui diritti umani e libertà vengono compressi, limitati o totalmente negati
Biomedical Sensors of Ionizing Radiation
No full textSensors Technology Series Editor-in-Chief's Preface vii Preface ix 1 Biomedical Sensors: Temperature Sensor ... G. Kim Prisk 4 Biomedical Sensors of Ionizing Radiation 129 Robert Speller, Alessandro Olivo, Silvia Pani, and Gary Royle 5 ..
Ciclope: micro Computed Tomography to Finite Elements
No full textThe Python package ciclope processes micro Computed Tomography images to generate Finite Element models. Ciclope is aimed to provide reproducible and fully open-source pipelines for simulating the mechanical behaviour of trabecular bone using the Finite Element method
Tetrahedral micro-FE models of human trabecular bone: a computationally efficient alternative to voxel models?
No full text"Simillima pestis Florentie et quasi per universum orbem": Boccaccio e la Historia Langobardorum di Paolo Diacono
No full textThis paper deals with the recently discovered Boccaccio’s autograph of Paul the Deacon’s Historia Langobardorum, the manuscript LONDON, British Library, Harley 5383. Along with its membra disiecta FIRENZE, Biblioteca Riccardiana, 627 and 2795VI, it forms a handbook of ancient, roman and mediaeval history (besides the Historia Langobardorum, Paul Orose’s Historiae adversus paganos, Paul the Deacon’s Historia Romana, books XIII-XVI, Pasquale Romano’s brief epistle De origine civitatis Aretii) almost entirely copied by Boccaccio.
After recalling the circumstances of its finding, the paper points out that text of Historia Langobardorum contained in Harley 5383 and in its membrum disiectum Riccard. 2795VI is abridged, more than the 20% of its chapters missing or being epitomized; whether Boccaccio was also the author of this version of Paul the Deacon’s work or simply its scribe remains under discussion
Open trabecular bone microFE models from microCT images: Ciclope new release with higher performances and verified tetra mesh option.
No full text- …
