Search results for " Fracture"

Hierarchical-ACA DBEM for Anisotropic Three-Dimensional Time-Harmonic Fracture Mechanics

2012

A hierarchical BEM solver for the analysis of three-dimensional anisotropic time-harmonic fracture mechanics problems is presented. A thorough investigation on the relations and interactions between the numerically computed anisotropic fundamental solutions and the algorithm used to approximate the blocks of the hierarchical matrix, namely Adaptive Cross Approximation, is carried out leading to the employed computational strategy. The use of the hierarchical matrices and iterative solvers is proved as an effective technique for speeding up the solution procedure and reducing the required memory storage in time-harmonic three-dimensional anisotropic fracture mechanics problems.

We are Still Learning from Death: After CPR, Balloon Expanding Valve (Intuity Aortic Valve) Revealed to be in Position

2021

Patients with high predicated risk undergo TAVI as an alternative treatment to surgical valve replacement...

Statistical tools and artificial intelligence approaches to predict fracture in bulk metal forming

2007

On the use of artificial intelligence tools for fracture forecast in cold forming operations

2006

Abstract The design of cold forming processes requires the availability of a procedure able to deal with the prevention of ductile fracture. In fact, the ability to predict fracture represents a powerful tool to improve the production quality in mechanical industry. In this paper, artificial intelligence (AI) techniques are applied to ductile fracture prediction in cold forming operations. The main advantage of the application of AI tools and in particular, of artificial neural networks (ANN), is the possibility to obtain a predictive tool with a wide applicability. The prediction results obtained in this paper fully demonstrate the usefulness of the proposed approach.

IS THERE A RELATIONSHIP BETWEEN MILD-MODERATE BACK PAIN AND FRAGILITY FRACTURES? ORIGINAL INVESTIGATION

2020

Introduction: Fragility fractures are the cause of 43 thousand deaths: 50% are caused by femur fractures, 28% by vertebral fractures and 22% by various fractures in women, in men the percentages are 47%, 39% and 14% respectively. Vertebral fractures are the most common, 30-50% women over age 50 will experience one of them. Worldwide, is estimated that a new vertebral fracture occurs every 22 seconds. Additionally, vertebral fractures strongly predict the risk of both further fractures and re-fractures, in any skeletal segment. Vertebral fractures are often asymptomatic. Early diagnosis of these is extremely important. The aim of the study is to show, within a population of women over-50 in …

The Drainage System of the Paranasal Sinuses: A Review with Possible Implications for Balloon Catheter Dilation

2011

Background Intersinus connections and accessory ostia of the maxillary sinus are well known to rhinologic surgeons but are less known for the remaining paranasal sinuses. Probing and dilatation of the natural ostia of diseased sinuses is being popularized currently by the clinical value of balloon catheter dilation (BCD). Although short-term high success rates with treatment of the dilated ostia/duct have been reported with this technique, the potential impact of fractures of adjacent bony septae on accessory sinus ostia, on mucosally lined surfaces, and on intersinus drainage pathways still has not been considered. The aim of this study was to review the literature on accessory sinus ostia…

3-D attenuation image of fluid storage and tectonic interactions across the Pollino fault network

2021

SUMMARYThe Pollino range is a region of slow deformation where earthquakes generally nucleate on low-angle normal faults. Recent studies have mapped fault structures and identified fluid-related dynamics responsible for historical and recent seismicity in the area. Here, we apply the coda-normalization method at multiple frequencies and scales to image the 3-D P-wave attenuation (QP) properties of its slowly deforming fault network. The wide-scale average attenuation properties of the Pollino range are typical for a stable continental block, with a dependence of QP on frequency of $Q_\mathrm{ P}^{-1}=(0.0011\pm 0.0008) f^{(0.36\pm 0.32)}$. Using only waveforms comprised in the area of seism…

Estimating Lower Limb Skeletal Loading

2011

Osteoporosis, accidents and subsequent bone fractures cause suffering on an individual level, as well as an economical burden to the society (Ortiz-Luna et al., 2009; Stevens & Olson, 2000). It has been estimated that, in Finland alone, between 30,000 to 40,000 osteoporosis-related fractures occur annually and that 400,000 Finnish people have osteoporosis (Duodecim, 2008). There are a few potential ways of preventing bone fracture, i.e. strengthening bones and/or preventing falls (Ortiz-Luna et al., 2009; Stevens & Olson, 2000). In order to withstand prevalent loading without breaking; while remaining relatively light in weight to allow for locomotion, bones have the ability to adapt their …

2020 Reply to: Denosumab for bone health in prostate and breast cancer patients receiving endocrine therapy? A systematic review and a meta-analysis …

2020

Bartotraumatic Blowout Fracture After Sneezing: Cone Beam CT demonstration

2013

Rarely a blowout orbital fracture is related to sneezing in patients with no history of trauma or sinus surgery. A case of barotraumatic, pure and isolated blowout fracture of the right orbit after sneezing diagnosed by CBCT is reported. A forty-year-old man complained sudden right diplopia after vigorous sneezing. On MRI a reduced size and an altered shape of the right maxillary sinus, a slightly increased vertical diameter of the right orbit, a round shape of the inferior rectus muscle on coronal sections, and a right maxillary haemosinus were observed. A strong peripheral enhancement of the maxillary sinus wall was evident. One week after the patient was submitted to a maxillofacial CBCT…