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130 results on '"Echigo T"'

8. Inferring origin of mercury inclusions in quartz by multifractal analysis

Author

Shibata, T., Maruoka, T., Echigo, T., Shibata, T., Maruoka, T., and Echigo, T.

Abstract

In order to refine our understanding of how fluid inclusions were trapped in the host minerals, we non-destructively observed mercury inclusions (liquid Hg0) in quartz samples using X-ray computed tomography (CT) technique. The X-ray CT apparatus can observe internal structures of the samples and give cross-sectional images from the transmission of the X-rays through the samples. From the cross-sectional images, we obtained three-dimensional spatial distributions of mercury inclusions, and quantitatively analyzed them using fractal and multifractal methods. Although the samples were from different geological settings, the resultant fractal dimensions were 1.70 and 1.71 for the San Benito and Itomuka samples, respectively. The fractal dimensions were also close to those predicted by diffusion-limited aggregation models and percolation theory, which are controlled by the irreversible kinetics. Given the fractal dimension and its implied mechanism, we conclude that the mercury-bearing fluids were not primary fluid inclusions, but migrated into the pre-existing cracks of quartz crystals by diffusion processes.

Published
2015

10. Two or more mirrors for the omnidirectional stereovision?

Author

Mouaddib, E., Sagawa, R., Echigo, T., Yagi, Y., Modélisation, Information et Systèmes - UR UPJV 4290 (MIS), and Université de Picardie Jules Verne (UPJV)

Subjects
[INFO.INFO-RB]Computer Science [cs]/Robotics [cs.RO], ComputingMilieux_MISCELLANEOUS
Abstract

International audience; no abstract

Published
2006

11. Stereo Vision with a Single Camera and Multiple Mirrors

Author

Mouaddib, E., Sagawa, R., Echigo, T., Yagi, Y., Modélisation, Information et Systèmes - UR UPJV 4290 (MIS), and Université de Picardie Jules Verne (UPJV)

Subjects
[INFO.INFO-RB]Computer Science [cs]/Robotics [cs.RO], ComputingMilieux_MISCELLANEOUS
Abstract

International audience; no abstract

Published
2005

13. Three-Dimensional Characterization of Iron Oxide (alpha-Fe2O3) Nanoparticles: Application of a Compressed Sensing Inspired Reconstruction Algorithm to Electron Tomography

Author

Monsegue, N., Jin, X., Echigo, T., Wang, G., Murayama, Mitsuhiro, Monsegue, N., Jin, X., Echigo, T., Wang, G., and Murayama, Mitsuhiro

Abstract

In this article, we demonstrate the application of a new compressed sensing three-dimensional reconstruction algorithm for electron tomography that increases the accuracy of morphological characterization of nanostructured materials such as nanocrystalline iron oxide particles. A powerful feature of the algorithm is an anisotropic total variation norm for the L1 minimization during algebraic reconstruction that effectively reduces the elongation artifacts caused by limited angle sampling during electron tomography. The algorithm provides faithful morphologies that have not been feasible with existing techniques.

Published
2012
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44. DNA sequence of the Escherichia coli K-12 gamma-glutamyltranspeptidase gene, ggt

Author

Suzuki, H, Kumagai, H, Echigo, T, and Tochikura, T

Abstract

The DNA sequence of ggt, the gene that codes for gamma-glutamyltranspeptidase (EC 2.3.2.2) of Escherichia coli K-12, has been determined. The sequence contains a single open reading frame encoding the signal peptide and large and small subunits, in that order. This result suggests that E. coli gamma-glutamyltranspeptidase is processed posttranslationally.

Published
1989
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