A study has been carried on estimating the distributed permittivity inside the measured object, a technology for estimating the distributed permittivity from capacitance and electric potential has not yet been established. In this paper, the capacitance and potential were calculated using the finite element method (FEM) with three measuring electrodes of different sizes. We proposed an estimation algorithm using capacitance and electric potential with distributed permittivity. The results of the estimation using proposed algorithm were described.

As mobile devices become more sophisticated, their components are required to adapt to high-frequency signals. Therefor kinds of printed wiring board materials are limited, and PTFE (polytetrafluoroethylene) becomes one of candidates by improving its low adhesion characteristic. In this study, the adhesion between PTFE and Cu thin films was investigated by varying an N⁺-ion beam fluence irradiated to PTFE. The irradiation condition of an N⁺-ion beam was controlled under an acceleration voltage of 5 kV - 10 kV at an incident angle of 60°. The main focus of this study was to investigate the surface shape and chemical state of the irradiated PTFE surface, which affected to adhesiveness of PTFE. The surface smoothness was temporarily improved by increasing an irradiation fluence, and also the mechanical properties were improved by increase of the surface C-C bonding at an acceleration voltage of 5 kV. As for adhesiveness, the relationship between Cu thin films and the irradiated PTFE surface was discussed from the ion implantation simulation.

In recent years, factory automation and automated guided vehicles (AGVs), which play a role in factory automation, have been attracting attention from the perspectives of securing labor, reducing labor costs, and increasing work efficiency. AGVs are mainly used for transporting and towing cargo, and can perform complex tasks by mounting a robot arm on the AGV. AGVs operate on storage batteries, which must be recharged or replaced, or the AGV itself must be replaced. In addition, work is interrupted when replacing storage batteries, which reduces work efficiency and indirectly affects costs such as labor costs. Therefore, the use of contactless power supply during transportation and during work can improve efficiency without worrying about the remaining storage battery level. In this paper, we discuss the configuration of a system for contactless power supply to mobility vehicles while they are moving.

It is concerned that the recent expansion of the application environment of power electronics to high-altitude and/or high-radiation environments will cause deteriorations of insulation materials used in power electronics due to charging caused by cosmic ray irradiation. With respect to the high-radiation environments, the exposure of high-energy charged particles such as protons, electrons, etc. to the insulation materials gives rise to the charge accumulations, which induce malfunctions of the power electronics, in the materials due to changes in the insulation characteristics of the materials. Therefore, in this paper, we have developed a program to calculate space charge transport in insulation materials irradiated with proton beams and calculated space charge behavior in PI (polyimide), which can be used in power electronics. Furthermore, we verified the usefulness of our program by comparing the calculation results with measured results and estimated the mechanism of space charge behavior in proton irradiated PI.