Research Gallery | My ongoing studies are reviewed here. | |
W.L. Bragg (Nobelist) humourously used to give a piece of advice to the young scientists entering his lab. | ||
Click the photo below for the enlargement. | Commentary | The articles |
We performed nondestructive determinationof the atomic number and molar concentration of a heavy element in a sample using polychrimatic single-voltage medical X-ray CT. | Analytical Sciences (2012) | |
Extensive pore-scale computer simulations were performed for the steady-state local diffusive fluxes in fluid-filled porous geomaterials to obtain some statistical finding.. | Transport in Porous Media (2012) | |
The renormalization technique was applied to the fast estimation of the electric resistivity of porous rocks saturated with conductive fluid, and the factors controlling the estimation accuracy were discussed quantitatively. | J. Appl. Geophys. 75, 31-41(2011) | |
We applied low-filed NMR relaxometry (photo) to the oil-contaminated soil core samples to detect the contaminated portions non-destructively. X-ray CT measurements were also carried out to visualize the pore water distribution within the core. | Water Air & Soil Pollution (2011) | |
We calculated the diffusion ellipsoids of anisotropic porous rocks by the X-ray CT-based random walk simulations. The principal axes and eigen values of the diffusion tensor were determined. | Water Resour. Res. (2008) | |
NMR relaxometry/diffusometry under a ultra low magnetic field (earth’s magnetic field).
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An original NMR surface scanner was developed to detect hidden water-filled cracks and pores in tunnels. | 1.AIST HP(Japanese) 2.AIST HP(Japanese) | |
Three-dimensional trajectory of a single random walk trial through a percolated pore cluster in a 3-D X-ray CT image set of a porous Niijima lava sample. | J. Nucl. Sci .Tecnol. 44 | |
NMR logging was performed at a Sumikawa geothermal test well to estimate the fracture apertures in andesite lava. | ||
Pulsed-field-gradient NMR was applied to bentonite-water mixture samples to construct a diffusion model of H2O molecules in water-rich smectite gels. | ||
Micro-focus X-ray CT image of a porous andesite sample from Sumikawa, Akita, Japan. The image dimension is 2563 voxels = 3.93 mm3. |
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Arrhenius plot of T2 relaxation time (0.47 T) of water protons in Kunigel-V1 bentonite gels for various clay weight fractions. | J. Nucl. Sci. Tecnol., 41 | |
X-ray microtomography of a porous sandstone was performed at a synchrotron facility (SPring-8) to analyze the pore tortuosity. | J. Contam. Hydrol., 74 | |
Diffusion of heavy ions in Wyoming bentonite gels was monitored by X-ray CT to measure the dependence of the diffusivity on the clay weight fraction and ion species. The 2-D image is the strontium diffusion in gels and bulk water obtained by a medical X-ray CT scanner. The image dimension is 5122 voxels = 1602 mm2. | J. Contam. Hydrol., 61 | |
Review on the self-diffusivity measurement of H2O in clay gels by pulsed-field-gradient NMR spectroscopy. The photo is the NMR spectrometer used (Bruker, Minispec, 0.47T) | ||
Transport properties (permeability and tortuosity) of porous media were estimated by random walk simulation using a three-dimensional X-ray CT image set. The image is a monodisperse bead pack (diameter, 2.11 mm) obtained by micro-focus X-ray CT. The image dimension is 2563voxels=13.63mm3. | ||
X-ray CT was applied to the diffusion test of iodine diffusion in water-rich montmorillonite gels. The image dimension is 5122 voxels = 1602 mm2. | Clays and Clay Minerals, 50 | |
H2O self-diffusivities in water-rich montmorillonite gels were measured using pulsed-gradient nuclear magnetic resonance spectroscopy to discuss the dependence of the diffusivities on the temperature and clay fraction. | ||
The X-ray CT system was successfully applied for the first time to the nondestructive and in-situ measurement of the diffusion of heavy ions in water-saturated porous media. The photo is the medical X-ray CT system used. | Engineering Geology, 56 |