scholarly journals Modified ideal observer model (MIOM) for high-contrast and high-spatial resolution CT imaging tasks

2017 ◽  
Vol 44 (9) ◽  
pp. 4496-4505 ◽  
Author(s):  
Juan P. Cruz-Bastida ◽  
Daniel Gomez-Cardona ◽  
John Garrett ◽  
Timothy Szczykutowicz ◽  
Guang-Hong Chen ◽  
...  
Keyword(s):  
Spatial Resolution ◽  
High Spatial Resolution ◽  
Ct Imaging ◽  
Ideal Observer ◽  
High Contrast ◽  
Observer Model

The influence of focal spot blooming on high-contrast spatial resolution in CT imaging

2015 ◽  
Vol 42 (10) ◽  
pp. 6011-6020 ◽  
Author(s):  
Joshua Grimes ◽  
Xinhui Duan ◽  
Lifeng Yu ◽  
Ahmed F. Halaweish ◽  
Nicole Haag ◽  
...  
Keyword(s):  
Spatial Resolution ◽  
Focal Spot ◽  
Ct Imaging ◽  
High Contrast

scholarly journals High spatial resolution and high contrast optical speckle imaging with FASTCAM at the ORM

2010 ◽  
Author(s):  
Lucas Labadie ◽  
Rafael Rebolo ◽  
Bruno Femenía ◽  
Isidro Villó ◽  
Anastasio Díaz-Sánchez ◽  
...  
Keyword(s):  
Spatial Resolution ◽  
High Spatial Resolution ◽  
High Contrast ◽  
Speckle Imaging

scholarly journals Signatures of an eccentric disc cavity: Dust and gas in IRS 48

2019 ◽  
Vol 490 (2) ◽  
pp. 2579-2587 ◽  
Author(s):  
Josh Calcino ◽  
Daniel J Price ◽  
Christophe Pinte ◽  
Nienke van der Marel ◽  
Enrico Ragusa ◽  
...  
Keyword(s):  
Spatial Resolution ◽  
Smoothed Particle Hydrodynamics ◽  
High Spatial Resolution ◽  
Contrast Ratio ◽  
High Contrast ◽  
Dust Grains ◽  
Mass Ratio ◽  
Dynamical Interaction ◽  
Particle Hydrodynamics ◽  
Smoothed Particle

ABSTRACT We test the hypothesis that the disc cavity in the ‘transition disc’ Oph IRS 48 is carved by an unseen binary companion. We use 3D dust–gas smoothed-particle hydrodynamics simulations to demonstrate that marginally coupled dust grains concentrate in the gas overdensity that forms in the cavity around a low binary mass ratio binary. This produces high contrast ratio dust asymmetries at the cavity edge similar to those observed in the disc around IRS 48 and other transition discs. This structure was previously assumed to be a vortex. However, we show that the observed velocity map of IRS 48 displays a peculiar asymmetry that is not predicted by the vortex hypothesis. We show the unusual kinematics are naturally explained by the non-Keplerian flow of gas in an eccentric circumbinary cavity. We further show that perturbations observed in the isovelocity curves of IRS 48 may be explained as the product of the dynamical interaction between the companion and the disc. The presence of an ∼0.4 M⊙ companion at an ∼10 au separation can qualitatively explain these observations. High spatial resolution line and continuum imaging should be able to confirm this hypothesis.

High spatial resolution AEM observations of yttrium segregation in chromia scales grown on Co-45%Cr

1986 ◽  
Vol 44 ◽  
pp. 518-519
Author(s):  
K. Przybylski ◽  
A. J. Garratt-Reed ◽  
G. J. Yurek
Keyword(s):  
Spatial Resolution ◽  
Outer Surface ◽  
Maximum Concentration ◽  
High Spatial Resolution ◽  
Reactive Elements ◽  
Chromia Scales

The addition of so-called “reactive” elements such as yttrium to alloys is known to enhance the protective nature of Cr2O3 or Al2O3 scales. However, the mechanism by which this enhancement is achieved remains unclear. An A.E.M. study has been performed of scales grown at 1000°C for 25 hr. in pure O2 on Co-45%Cr implanted at 70 keV with 2x1016 atoms/cm2 of yttrium. In the unoxidized alloys it was calculated that the maximum concentration of Y was 13.9 wt% at a depth of about 17 nm. SIMS results showed that in the scale the yttrium remained near the outer surface.

Integration of Core-Edge Spectroscopy Methods for the Study of Polymers

1996 ◽  
Vol 54 ◽  
pp. 154-155
Author(s):  
E. G. Rightor
Keyword(s):  
Excited State ◽  
Polymer Blends ◽  
Gas Phase ◽  
Spatial Resolution ◽  
High Spatial Resolution ◽  
Electronic States ◽  
Core Electron ◽  
Bulk Solids ◽  
Development Application

Core edge spectroscopy methods are versatile tools for investigating a wide variety of materials. They can be used to probe the electronic states of materials in bulk solids, on surfaces, or in the gas phase. This family of methods involves promoting an inner shell (core) electron to an excited state and recording either the primary excitation or secondary decay of the excited state. The techniques are complimentary and have different strengths and limitations for studying challenging aspects of materials. The need to identify components in polymers or polymer blends at high spatial resolution has driven development, application, and integration of results from several of these methods.

High spatial-resolution reflectivity and fluorescence mapping of multilayers using a sub-micrometer focused synchrotron X-ray beam

2003 ◽  
Vol 104 ◽  
pp. 247-250
Author(s):  
T. Bigault ◽  
E. Ziegler ◽  
Ch. Morawe ◽  
W. Ludwig ◽  
R. Soufli
Keyword(s):  
Spatial Resolution ◽  
High Spatial Resolution ◽  
X Ray
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