Electricity, which is related with many subjects, is a useful theme for STEM/STEAM education. Therefore, it is important for teachers to recognize the relation. On the other hand, in the Elementary and Secondary Education Support Working Group of the Institute of Electrical Engineers of Japan Social Cooperation Committee investigated the relation of the Course of Study to the booklets “Fundamental Understanding of Electricity and Electric Energy Series” prepared by IEEJ in order to spread to schools. However, the mapping table showing the relation was for only Science. In addition, there have been no cases investigated regarding the context in which electricity was described on the textbook. So, the purpose of this study was to investigate the contents regarding electricity in the newly used textbooks based on the new Course of Study (2017 revision). The Subjects researched were Technology, Home Economics, Science, Social Studies, Art and Handcraft, and Living Environment Studies.

Since the nuclear disaster in Fukushima, Japanese soil scientists have tackled soil contamination problems due to radioactive cesium. For the radiation education based on the research results and outreach activities, we published a comic book and developed a digital application using iOS Xcode for Apple iPhone and tablet devices. This allows students to quickly understand why clay soil absorbed cesium and how to remove contaminated soil using educational mini-games. Through radiation education seminars and a conference, our application was evaluated and revised by school teachers.

Through sensing technology education, we developed a wireless network system with Arduino to investigate soil moisture and salinity in damaged agricultural fields by the 2011 Tohoku Earthquake and the 2016 Kumamoto Earthquakes. The sensor network system was installed to monitor soil moisture and bulk soil electrical conductivity at three locations in each research site. Our findings were local spatial variability of high soil salinity, influencing crop growth at the fields. The sensing technology education through online seminars and training empowered students in their self-regulated learning process to manage the sensor network system between college and university.

In recent years, the period of taking liberal arts subjects and specialized subjects at universities has been mixed over four years, and wedge-shaped education that incorporates specialized subjects into the curriculum has become widespread. Students need to study specialized subjects such as electromagnetics from an early stage. Some ingenuity is required to facilitate the education of electromagnetics in the wedge-shaped curriculum, and the author thinks that visualization of electromagnetic fields by simulation has a high educational effect as one of them. This paper introduces an example of using an electromagnetic simulation application in electromagnetics education. The explained theory and the properties of electric and magnetic fields were confirmed through visualization with a simulator. A questionnaire survey was conducted, and it was found that the use of simulation is effective in promoting understanding.

The voltage loss factors in Protonic Ceramic Fuel Cell (PCFC) are caused by anode polarization, cathode polarization and voltage drop by internal resistance. In this paper, an analytical method which divides the total voltage loss into the ohmic loss, anode overvoltage, and other overvoltage by current interruption technique has been reported. Firstly, applying the develop method to analysis of voltage loss factors, the number of RC parallel elements can be determined as seven from the voltage relaxation waveform without assuming the number of elements in advance. Secondly, it was revealed that the overvoltage η1 which is the smallest time constant in seven elements is caused by the hydrogen concentration in the fuel and steam concentration in the Air electrode. Moreover, it was revealed that and the overvoltage η3 and η4 are caused by the oxygen concentration and steam concentration in the air electrode. Especially, η5 is caused by oxygen in air electrode. On the other hands, it could not clearly separate the overvoltage η2 which might be caused by the hydrogen, oxygen, and steam concentration in the fuel electrode but also η6 to η7 in this study.

Silicon carbide (SiC) devices exhibit several advantages such as high withstand voltage, high temperature operation, and low loss compared to conventional Si devices. To utilize the unique characteristics of SiC devices, it is necessary to improve the characteristics of the power module package. In particular, the insulation characteristics of the package depend on the insulating substrates. In this study, we focused on the difference in dielectric breakdown points when the temperature conditions are changed. It was clarified that the factor that affects the withstand voltage may be the internal stress applied to the insulating substrate due to changes in the ambient temperature, in addition to the electric field strength distribution including the triple junctions.

This paper provides influence of Sm-rich phase on magnetic properties of Sm-diffused Sm₂Fe₁₇N₃ powder prepared by reduction-diffusion process with Sm₂Fe₁₇ and Sm₂O₃ powder. The reduction-diffused powder was washed by Ethylene-Glycol (EG) or water in Glove-box (GB) or air, and the coercivity changing rate (H_c changes from after nitriding to after heat resistance test) was investigated. The coercivity of powders after heat resistance test depended on oxygen content of the powders. In the Sm-Fe-N powder, Sm-rich amorphous phase, which could be SmFe₃ nitrided phase, existed at grain boundary and the amorphous SmFe₃ nitrided phase can be easily oxidized during washing resulting in decreasing coercivity.

This study deals with structural coloration caused the optical properties having multiple reflection peaks. Getting the dominant wavelengths and the color coordinates in sRGB color space from the reflection by thin layer interference, we numerically consider the color notation and show the visible color. Moreover, we consider a multilayer model that applies thin layer interference. Numerical results for the multilayer model show wavelengths selectivity.

Transient magnetic far-fields due to collision electrostatic discharges (ESDs) between spherical electrodes charged at a voltage of 600 V were measured with a 6 GHz magnetic near-field probe in the previous study. Here, the frequency spectra are analyzed and compared with those of magnetic far-fields calculated from a previously developed image dipole method combined with a spark resistance formula. The occurrence condition of spectral peaks in the probe band is clarified with respect to the electrode diameters from 30 mm to 70 mm.

To establish a novel section locating technique of water-tree degraded 22 kV cross - linked polyethylene (XLPE) cable, we measured the injected current pulse with residual - charges due to water trees in a XLPE cable which was used for 27 years and removed after performing residual charge measurement. It was found that the current/voltage pulse injected at a prescribed value of AC voltage may carry residual charges reflecting water tree length.