Gravitational Clustering in the Expanding Universe: Controlled High-Resolution Studies in Two Dimensions: Erratum

1992 ◽  
Vol 384 ◽  
pp. 665
Author(s):  
John Francis Beacom ◽  
Kurt G. Dominik ◽  
Adrian L. Melott ◽  
Sam P. Perkins ◽  
Sergei F. Shandarin
Keyword(s):  
High Resolution ◽  
Two Dimensions ◽  
Expanding Universe ◽  
Gravitational Clustering

Gravitational clustering in the expanding universe - Controlled high-resolution studies in two dimensions

1991 ◽  
Vol 372 ◽  
pp. 351 ◽  
Author(s):  
John Francis Beacom ◽  
Kurt G. Dominik ◽  
Adrian L. Melott ◽  
Sam P. Perkins ◽  
Sergei F. Shandarin
Keyword(s):  
High Resolution ◽  
Two Dimensions ◽  
Expanding Universe ◽  
Gravitational Clustering

scholarly journals High Resolution Multimodal Photoacoustic Microscopy and Optical Coherence Tomography Visualization of Choroidal Vascular Occlusion

2020 ◽  
Vol 21 (18) ◽  
pp. 6508
Author(s):  
Van Phuc Nguyen ◽  
Yanxiu Li ◽  
Jessica Henry ◽  
Wei Zhang ◽  
Xueding Wang ◽  
...  
Keyword(s):  
Optical Coherence Tomography ◽  
High Resolution ◽  
Laser Energy ◽  
Vascular Occlusion ◽  
Two Dimensions ◽  
Fundus Photography ◽  
Optical Coherence ◽  
Photoacoustic Microscopy ◽  
Biological Studies ◽  
Multiple Imaging

Photoacoustic microscopy is a novel, non-ionizing, non-invasive imaging technology that evaluates tissue absorption of short-pulsed light through the sound waves emitted by the tissue and has numerous biomedical applications. In this study, a custom-built multimodal imaging system, including photoacoustic microscopy (PAM) and optical coherence tomography (OCT), has been developed to evaluate choroidal vascular occlusion (CVO). CVO was performed on three living rabbits using laser photocoagulation. Longitudinal imaging of CVO was obtained using multiple imaging tools such as color fundus photography, fluorescein angiography, indocyanine green angiography (ICGA), OCT, and PAM. PAM images were acquired at different wavelengths, ranging from 532 to 700 nm. The results demonstrate that the CVO was clearly observed on PAM in both two dimensions (2D) and 3D with high resolution longitudinally over 28 days. In addition, the location and margin of the CVO were distinguished from the surrounding choroidal vasculature after the injection of ICG contrast agent. PAM imaging was achieved using a laser energy of approximately 80 nJ, which is about half of the American National Standards Institute safety limit. The proposed imaging technique may provide a potential tool for the evaluation of different chorioretinal vascular disease pathogeneses and other biological studies.

scholarly journals High Resolution Inverse Scattering in Two Dimensions Using Recursive Linearization

2017 ◽  
Vol 10 (2) ◽  
pp. 641-664 ◽  
Author(s):  
Carlos Borges ◽  
Adrianna Gillman ◽  
Leslie Greengard
Keyword(s):  
High Resolution ◽  
Inverse Scattering ◽  
Two Dimensions

Imaging and Characterization of Microporous Carbonates Using Confocal and Electron Microscopy of Epoxy Pore Casts

SPE Journal ◽  
2019 ◽  
Vol 24 (03) ◽  
pp. 1220-1233 ◽  
Author(s):  
A.. Hassan ◽  
V.. Chandra ◽  
M. P. Yutkin ◽  
T. W. Patzek ◽  
D. N. Espinoza
Keyword(s):  
Electron Microscopy ◽  
High Resolution ◽  
Oil Recovery ◽  
Laser Scanning ◽  
Two Dimensions ◽  
Laser Scanning Microscopy ◽  
Three Dimensions ◽  
Confocal Laser ◽  
Improved Oil Recovery ◽  
Imaging Approach

Summary Microporous carbonates contain perhaps 50% of the oil left behind in current projects in the giant carbonate fields in the Middle East and elsewhere. Pore geometry, connectivity, and wettability of the micropore systems in these carbonates are of paramount importance in finding new improved-oil-recovery methods. In this study, we present a robust pore-imaging approach that uses confocal laser scanning microscopy (CLSM) to obtain high-resolution 3D images of etched epoxy pore casts of the highly heterogeneous carbonates. In our approach, we have increased the depth of investigation for carbonates 20-fold, from 10 µm reported by Fredrich (1999) and Shah et al. (2013) to 200 µm. In addition, high-resolution 2D images from scanning electron microscopy (SEM) have been correlated with the 3D models from CLSM to develop a multiscale imaging approach that covers a range of scales, from millimeters in three dimensions to micrometers in two dimensions. The developed approach was implemented to identify various pore types [e.g., intercrystalline microporosity (IM), intragranular microporosity (IGM), and interboundary sheet pores (SPs)] in limestone and dolomite samples.

Scaling Relations for Gravitational Clustering in Two Dimensions

1998 ◽  
Vol 495 (1) ◽  
pp. 25-28 ◽  
Author(s):  
J. S. Bagla ◽  
S. Engineer ◽  
T. Padmanabhan
Keyword(s):  
Two Dimensions ◽  
Scaling Relations ◽  
Gravitational Clustering
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