1,955 research outputs found
Selective diffusion for oriented pattern extraction: Application to tagged cardiac MRI enhancement
Anisotropic regularization PDE’s (Partial Differential Equation) raised a strong interest in the field of image processing. The benefit of PDE-based regularization methods lies in the ability to smooth data in a nonlinear way, allowing the preservation of important image features (contours, corners or other discontinuities). In this article, a selective diffusion approach based on the framework of Extreme Physical Information theory is presented. It is shown that this particular framework leads to a particular regularization PDE which makes the integration of prior knowledge possible within the diffusion scheme. As a proof of feasibility, results of oriented pattern extractions are first presented on ad hoc images and second on a particular medical application: Tagged cardiac MRI (Magnetic Resonance Imaging) enhancement
Absorption Systems In Radio-Selected QSO Surveys
Radio-selected samples of quasars with complete optical identifications offer
an ideal dataset with which to investigate dust bias associated with
intervening absorption systems. Here, we review our work on the Complete
Optical and Radio Absorption Line System (CORALS) survey whose aim is to
quantify this bias and assess the impact of dust on absorber statistics. First,
we review previously published results on the number density and gas content of
high column density absorbers over the redshift range 0.6 < z < 3.5. We then
present the latest results from CORALS which focus on measuring the metal
content of our unbiased absorber sample and an investigation of their
optical--IR colours. Overall we find that although dust is unarguably present
in absorption galaxies, the level appears to be low enough that the statistics
of previous magnitude limited samples have not been severely affected and that
the subsequent reddening of background QSOs is small.Comment: Proceedings of IAUC199, Probing Galaxies through Quasar Absorption
Lines, P. R. Williams, C. Shu, and B. Menard, ed
The accumulation and trapping of grains at planet gaps: effects of grain growth and fragmentation
We model the dust evolution in protoplanetary disks with full 3D, Smoothed
Particle Hydrodynamics (SPH), two-phase (gas+dust) hydrodynamical simulations.
The gas+dust dynamics, where aerodynamic drag leads to the vertical settling
and radial migration of grains, is consistently treated. In a previous work, we
characterized the spatial distribution of non-growing dust grains of different
sizes in a disk containing a gap-opening planet and investigated the gap's
detectability with the Atacama Large Millimeter/submillimeter Array (ALMA).
Here we take into account the effects of grain growth and fragmentation and
study their impact on the distribution of solids in the disk. We show that
rapid grain growth in the two accumulation zones around planet gaps is strongly
affected by fragmentation. We discuss the consequences for ALMA observations.Comment: Accepted for publication in Planetary and Space Science. 13 pages, 4
figure
Galaxy Morphology - Halo Gas Connections
We studied a sample of 38 intermediate redshift MgII absorption-selected
galaxies using (1) Keck/HIRES and VLT/UVES quasar spectra to measure the halo
gas kinematics from MgII absorption profiles and (2) HST/WFPC-2 images to study
the absorbing galaxy morphologies. We have searched for correlations between
quantified gas absorption properties, and host galaxy impact parameters,
inclinations, position angles, and quantified morphological parameters. We
report a 3.2-sigma correlation between asymmetric perturbations in the host
galaxy morphology and the MgII absorption equivalent width. We suggest that
this correlation may indicate a connection between past merging and/or
interaction events in MgII absorption-selected galaxies and the velocity
dispersion and quantity of gas surrounding these galaxies.Comment: 6 pages; 3 figures; contributed talk for IAU 199: Probing Galaxies
through Quasar Absorption Line
Exploitation de données oculométriques pour une modélisation du processus d’interprétation d’examens TEP/SCAN
National audienc
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