In recent years, contactless power transfer technology has attracted attention as a new power transfer technology. However, there is a problem that the efficiency of contactless power transfer with coupled magnetic fields decreases due to misalignment and changes in distance. In this study, we experimentally investigate the shape of the coil on the transmission side that enables stable power transfer in all directions in the horizontal direction. Experimental investigations were conducted to determine whether stable power supply to the receiving side is possible even when the angle of the transmission coil changes by using a figure-of-eight or an eight-parallel spherical coil winding. The S-parameters were measured using a Vector Network Analyzer with two ports of the transmitter and receiver coils, and the angle variation characteristics of the transmission coil were investigated by converting the S-parameters to Z-parameters and calculating the theoretical maximum efficiency from the Z-parameters.

Recent methods using thermistors as an early detection of skin cancer require the higher resolution of 5 mK. Previously, the authors developed a vacuum insulated temperature device that calibrates the resistance temperature characteristics of thermistors, so that it improves the temperature resolution and accuracy of skin cancer diagnosis. In this study the operational methods of the calibration system were compared for improving further accuracy using the temperature calibration device and the oil tank calibration device. The results of the comparison indicated that the temperature calibration device is probably as accurate as the oil tank calibration device.

In order to mitigate weather disasters caused by heavy precipitations, it is important to observe 3-dimensional precipitation structure in a storm with high temporal resolution. In recent years, the development of phased array weather radar is being promoted for high-speed precipitation observations. We propose an algorithm for predicting heavy rainfall using machine learning for the novel phased array weather radar (Multi-Parameter Phased Array Weather Radar: MP-PAWR) observation data. The algorithm predicts localized convective rainfall by extracting the vertical structure of storms observed by MP-PAWR for each precipitation cell. The proposed method with the combination of convolutional neural networks and long short-term memory networks were applied to various observation data from MP-PAWR with high spatial and temporal resolution to predict heavy rainfalls a few minutes later. The results showed that the use of specific differential phase data gave particularly accurate predictions for heavy rainfall compared to radar reflectivity factor and differential reflectivity data.

In recent years, due to the demand for miniaturization and weight reduction of magnetic devices such as in-vehicle drive motors, the authors have focused on miniaturization of the system through the fusion of devices. In this paper, we proposed an integrated motor structure combining a step-up reactor and a motor for a motor drive system using a step-up DC/DC converter. After confirming that the reactor and motor functioned independently, we calculated the characteristics when they operated simultaneously, and investigated the improvement of the motor torque characteristics by changing the structure of the reactor.

In this paper, the space charge profiles in elastomer sheets with laminating area of vertical direction against electric field direction is investigated. Samples were prepared using a stereolithographic 3D printer. Sample N has no lamination. Sample H has horizontal laminating direction against sample surface. Space charge distribution was measured using the pulsed electro-acoustic system. The DC conduction current was measured by using a current integration meter. The accumulated positive charge amount near the anode in sample H was found to be larger than that in sample N. It is considered that a number of positive charges raised via the Pool Frenkel mechanism accumulated at the laminate interface in sample H.

This paper proposes a science workshop in which children find the science around them by themselves, think about experiments, prepare experiments, imagine the results of experiments, and lead the results. This workshop is meaningful as a place to experience the fun of science and experimentation, as well as a place to collaborate with others. Science workshops emphasize the importance of developing an interest in science while enjoying scientific exploration and discovery. Workshop participants will acquire not only scientific knowledge and skills, but also creativity and logical thinking skills. A science experiment map and a science experiment compass were developed for the science workshop. The proposed workshop will enhance children’s interest in science. The proposed workshop was conducted for elementary school students and is reported in this paper.