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The present study was based on the assumption that there are two visual channels which provide separate contributions to visuo-motor recalibration following prismatic displacement of the visual field. The functional properties of the two channels were assumed to conform to predictions from the two motion-analyzing systems models of visual motion perception.(More)
High-resolution measurements of total phosphorus (TP) concentrations in a stream draining a 5 km 2 agricultural catchment (a sub-catchment of Lough Neagh in Northern Ireland) were made every 10 mins by continuous flow instrumentation using new homogenisation, digestion and colorimetric phases. Concurrently, rainfall and stream discharge data were collected(More)
In this work we present an inverse finite-element modeling framework for constitutive modeling and parameter estimation of soft tissues using full-field volumetric deformation data obtained from 3D ultrasound. The finite-element model is coupled to full-field visual measurements by regularization springs attached at nodal locations. The free ends of the(More)
A six-month series of high-resolution synchronous stream discharge and total phosphorus (TP) concentration data is presented from a 5 km 2 agricultural catchment in the Lough Neagh basin, Northern Ireland. The data are hourly averages of 10-minute measurements using a new bankside, automatic, continuous monitoring technology. Three TP transfer ‘event-types’(More)
We present a modular framework for mechanically regularized nonrigid image registration of 3D ultrasound and for identification of tissue mechanical parameters. Mechanically regularized deformation fields are computed from sparsely estimated local displacements. We enforce image-based local motion estimates by applying concentrated forces at mesh nodes of a(More)
Computational biomechanical models have become integral components in many areas of modern medical care, including diagnostic applications, image-guided procedures , robot-assisted procedures, and surgical simulators. The development of appropriate models for the mechanical behavior of soft tissues is challenging due to the inherent complexities of the(More)
The recent advent of real-time 3-D ultrasound (3DUS) imaging enables a variety of surgical procedures to be performed within the beating heart. Implementation of these procedures is hampered by the difficulty of manipulating tissue guided by the distorted, low resolution 3DUS images and the dexterity constraints imposed by the confined intracardiac space.(More)
Constitutive models of the nonlinear, viscoelastic response of soft tissue under large strains typical of medical manipulations is required for accurate diagnostic and simulation purposes. We have modified a constitutive model used to describe cartilage and cervix to characterize the large strain mechanical behavior of breast tissue across pathologies(More)
A spatially developing two-dimensional mixing layer interacting with an incident compression wave is simulated in order to analyse the mechanisms leading to the shock noise emission. Various upstream forcing modes leading to various characteristics of subsequent travelling two-dimensional coherent structures are tested in order to assess their respective(More)