This paper investigates the shape collapse problem in nonrigid image registration. The shape collapse problem is the situation when an appendage of a deforming object does not overlap with the target shape and collapses to a set of zero measure during the registration process. The dual problem occurs when a new appendage grows out of the object to match the target shape. In both cases, the esti...

A detailed microscopic study of the temperature dependence of the shapes of some rare-earth nuclei is made in the relativistic mean field theory. Analyses of the thermal evolution of the single-particle orbitals and their occupancies leading to the collapse of the deformation are presented. The role of the nonlinear σ−field on the shape transition in different nuclei is also investigated; in it...

The radiographic files of 70 patients with Kienbock's disease were analyzed. Ulnar variance, carpal height and Kienbick stage were determined. A significant difference in ulnar variance was seen between early and late stages of the disease. In later stages there is a marked negative ulnar variance, not caused by bone apposition on the radius. We hypothesize that negative ulnar variance encourag...

A hypoplastic constitutive model is implemented in a Smoothed Particle Hydrodynamics (SPH) code for the first time. An improved wall boundary treatment is presented for better performance. The proposed approach is first validated by comparing the numerical results with the analytical solutions for oedometer test. Two more problems involving large deformation, i.e. the collapse of sand between t...

transient compressive excitation is described and tested. It is shown that impacts induce a chaotic collapse of crumple layers. The simulations predict shock pulses and intralaminar forces. Simulated shock pulses that a free-falling mass is subjected to, and the corresponding animated deformation histories of the layers, are compared with the high-speed videography. Cushioning performance maps ...

this study aims to numerically investigate on the crashworthiness of thin-walled square tubes by consideration of 3-d oblique loading. in this type of loading, direction of loading is defined by using two spatial angles relative to the position of the tube. to this aim, finite element (fe) analysis is employed to simulate the loading for 8 different numerical models with different loading orien...

Abstract Catastrophic failure of a tailings dam at an iron ore mine complex in Brumadinho, Brazil, on 25th January 2019 released 11.7 million m 3 downstream. Although reportedly monitored using array geotechnical techniques, the collapse occurred without any apparent warning. It claimed more than 200 lives and caused considerable environmental damage. Here we present Intermittent Small Baseline...

Collapse of granular material is usually accompanied by long run-out flows in natural hazards, e.g. rock/debris flow and snow avalanches. This paper presents a novel multi-scale approach for modelling column collapse with large deformation. employs the smoothed particle hydrodynamics (SPH) method to solve deformation boundary value problems, while using micromechanical model derive nonlinear re...

The factors leading to the collapse of tunnel face are diverse, and there is an interaction relationship between multiple influencing at physical mechanical level. By analyzing coupling affecting instability working face, this paper deduces calculation method effect construction risk for a certain event based on conditional probability theory, makes reasonable assumptions monitoring data probab...