− This work describes a single-step constrained least-squares algorithm able to image underground electrical resistivity distributions. Using an approximate analytical solution for a spherical object embedded in a homogeneous medium yields synthetic data. A 16-electrode array yields 104 independent measurements. Shifting the electrode array parallel to itself permits us to obtain 3D images. The...

1 Central Research Institute of Electric Power Industry, 1646,Abiko, Abiko, Chiba, Japan 2 Professor, Disaster Prevention Research Institute ,Kyoto University, Gokasho, Uji, Kyoto, Japan 3 Idemitsu Engineering Co. , Ltd, Mihama, Chiba, Japan Email: [email protected],[email protected], [email protected], [email protected] ABSTRACT : Man...

in this study, a cylindrical bolling probe was developed and evaluated for measuring stress in soil under tire traffic. the probe consists of a silicon rubber head for sensing the soil stress, a pvc tube for transferring the liquid pressure, a digital pressure sensor and a syringe for filling the probe with water and adjusting the initial inclusion pressure. a tank with pressurized air was used...