The next morning, we visited the Demonstration School (DS) of Phayao University, It was a beautiful sunny and refreshing morning. Here in the northern part of Thailand, the weather is about the same as late October in Japan. It is very refreshing.

Today's job is assembling the seismographs. I will assemble the parts that were sent by EMS at the end of the year. At first, I thought be going to do it by myself, but there were about 30 students waiting for me, so I changed the plan and asked them to help me. It would have been more efficient if I had done it by myself, but it was an educational consideration.

I show the students how to do it, and they assemble it themselves. Many students are not used to tightening even a single screw, and I emphasized the importance of this kind of work for those who aspire to science.

The students are now getting used to handling the Hex key, which they had been puzzled about. However, since it is plastic, we have to be careful not to tighten it too hard.

Seismograph installed with the help of students. I will ask the teacher to do the cover. I will show you the amazing production room later. This floor is on the second floor, but it is built on a slope, and the ground is so solid that even if a student jumps on it, it will not be strongly affected. It is the best place for observation, and the students can easily see the real-time display.

1/5 And one more thing to note. The power supply for the amplifier in the upper right was very hot, so I checked the same type of power supply at Silpakorn University, where I am now, and found it cold. I thought I had mistaken the switch of the voltage of the power supply and checked with the other party. They said that the switch was set to 110V, so they quickly changed it to 220V. The machine was cooled down by this change. I almost broke the power supply. Thank goodness.

It took a lot of effort, but I managed to finish setting up the software and was able to display waveform signals for three channels. In fact, it seems that a teacher had installed multiple Procrssing programs, and an error occurred at first due to conflicts between them. A young physics teacher here, who is very good with PCs, found the error when I was about to give up and have lunch. It was a good learning experience for me, since various causes of trouble can occur in a new environment. It was difficult to find the cause of the error, and at one point we even considered replacing the PC.

Rocks and a polarization unit that I brought as a souvenir for this teacher. I would like to use it again in my classes at this school near future.

After lunch, I gave a lecture to the students. The news of the Noto earthquake was widely reported here, and I talked about earthquakes for about 90 minutes, with a break in between. After that, I explained the structure and operation of seismographs and the mechanism of AD conversion to the students who were interested in them. The students who stayed until the end were those who had participated in my class last September.

This is the factory owned by the high school. It is equipped with such facilities for science education. This person is a laboratory teacher, and he makes teaching materials using these equipment. It is really amazing that there are two huge laser cutters. The one on the right is the newest one. I want one of these somewhere. Every science high school I visited in Thailand had this laser cutter. I am so envious of them.

Almost all machine tools are available. The only thing missing is a milling machine.

This is a small table-top lathe. It is the same size as the one I bought with a Kakenhi grant in the past. It is a pity that it is a little rusty. If I could be hired here for a short term, I will maintain it nicely.

Finally, after a long day, we were invited to dinner. It was a wonderful sunset at Phayao Lake (artificial lake), which can be called "the Lake Shinji" of Thailand.

As usual, we stopped by the home (mansion) of the director (principal) in the left foreground, and had dinner with Brandy, his pride and joy. Instead of the usual beer, we drank Brandy with soda. Dr.Chatchawal, who is a researcher with his PhD from an Austrian university and a teacher at Phayao University, is in the front right. He is a biogeography expert and a professor at Phayao University. He was very aggressive and was the main character of the dinner.

The next morning, on the way to Chiang Rai airport, I stopped by to check out an outcrop in front of the entrance of Phayao University that I had been curious about for a while. The red and white rocks are distinctive. From a distance, I could not tell what kind of rocks they were.

The university's junior and senior high schools loaned me a hammer to break the rock, and I found it to be red sandstone. I will check the age of the stratum in the future. At least it was good to know that it is a sedimentary rock formation. If I ever come to this university again, I would definitely take my students to see the rocks. I found that the rock is a red sandstone formation of Triassic to Jurassic age, according to a related paper. Here is a related paper: https://www.jstage.jst.go.jp/... /psj1985/18/2/... /psj1985/18/2/18_2_165/_pdf

Next, at the recommendation of Dr. C, a staff member of the university, we visited a temple where Buddhist statues and sculptures are made of this red sandstone. Mr. P, a staff member of the attached junior high school and high school, who accompanied us, was a little scared because he heard there were scary dogs, but fortunately we did not encounter any.