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Volume 4: The Dragon Raises its Head Chapter 13: Teaching Materials for Special Periods

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    During Sun Zhenglu's decades of research, based on Tian Yusheng's story, Fu Xin judged that he just had a lot of experience in the feeder automation system based on the cooperation of automated switchgear. But even so, Fu Xin was very  Happy.  If, if Huaxing can invite him over, we can use the cooperation mode of Toshiba's recloser and voltage-time segmenter with the recloser and recloser of Cooper of the United States before Toshiba of Japan and Cooper of the United States.  If the feeder automation system based on the mutual cooperation of automated switchgear represented by the model is completed and registered, Huaxing will make a lot of money!  "Master, please ask, how to get to this address?" Fu Xin entered a village in the city. After walking around for a few times, he really couldn't figure out the direction. In desperation, Fu Xin had to stop the car at the intersection and take the  Taking the note handed over by Tian Yusheng, he asked the passing residents outside the window for directions.  None of the four people in the car had been to this place called "Pingliang Road". Tian Yusheng vaguely knew that the Puyang District Government was located near Pingliang Road, but Pingliang Road was relatively long, so this area was really a bit big.  , so big that it¡¯s dizzying.  "Andre, Pingliang, oh, I know, that place is really not easy to find, and it's not on Pingliang Road. It's close to the Huangpu River, and it's very far inside. Can you guys look for it?  It's not normal Let's go all the way south. When we see a water tower, we go east. About two miles ahead, there are two chimneys. There is an alley under the second chimney.  Follow that alley and go south" The old man from Haicheng City, who was still very enthusiastic, kept talking and gesticulating, but before he could finish speaking, the four people in the car had already fainted.  After passing countless water towers and chimneys, Fu Xin and the others finally found the community at the address. It was a community composed of more than a dozen six-story unit buildings built in the 1950s. There were tall trees planted in the community.  The poplar trees cover the sky and the sun, and look very shady in the midsummer afternoon.  "Comrade, who are you looking for?" At the gate of the community, a gray-haired old lady came forward vigilantly, stopped the jeep, looked at the four big men sitting in the car, and asked vigilantly, she  Wearing a hoop on his arm, he looked like a Red Guard.  "No. 13, Nine Gates, 202, Sun Zhenglu." Tian Yusheng took the note and read it to the old lady according to the content on it. After reading, he handed the note to the old lady's hand and asked her to  The lady checked and asked at the same time: "Aunt, please ask, does this old gentleman still live here?" The old lady took out a pair of reading glasses from a pair of pockets very professionally, put them on the bridge of her nose, and leaned against the sun.  In the light, God saw the words on it clearly, so he asked with a vigilant face: "What is the relationship between Nong and Nong? What do Nong and Nong want to do with him?" Tian Yusheng honestly confessed: "  Aunt, I'm his student, I came here specifically to see him! " "Student? Where's the student? " "Uh" Tian Yusheng looked even more wary when he saw this grandson.  Zheng Lu was only a visiting professor and had very little time as a teacher. Maybe this aunt didn¡¯t know that Sun Zheng Lu had also been a teacher, so she was so wary!  But the explanation must continue!  Tian Yusheng continued to explain: "Aunt, I was a student at the Offshore Electric Power College, oh, it used to be called Offshore Electric Power College. Mr. Sun was my tutor. By the way, this is my work permit. I am from Huaxing, Xijiang Province.  An electrician from Huaxing Machine Tool Factory, a subsidiary of the Industrial Development Company. "The old lady took the work permit handed over by Tian Yusheng, looked at it very carefully, and said, "Not bad, young man, he is still a director-level electrician. How about you guys go in?  Come on! Who is that? He must be the driver! Stop the car that Nong drove over under the shade of the tree." Her last sentence was to Fu Xin, who was sitting in the driver's seat.  As an electrician, Tian Yusheng really can't occupy the position of director. This position of director was just given to him not long ago by Fu Xin. After all, he is now participating in the West-to-East Electricity Transmission Project of Huaxing.  Leader of the Liaison Group.  "That's not the driver, he's" Tian Yusheng was about to explain.  "Haha, I'm the driver." Fu Xin chuckled.  Judging from their ages, it is most reasonable to say that Fu Xin is Tian Yusheng's driver.  After all, Tian Yusheng is seven or eight years older than Fu Xin. If Fu Xin is Tian Yusheng's superior, the old lady will probably call the police immediately, thinking that these four young people must be idle members of society. To put it bluntly, they are not.  Good people.  The simplest piece of evidence is: How can there be any reason in this world for a boss to drive for his employees?  "Auntie, is Mr. Sun at home at this time?" Tian Yusheng asked with concern. As for whether Sun Zhenglu is still alive, there is no need to ask. From the old lady's reaction, we can see that Sun Zhenglu must still be alive.There is no need to add to your troubles and be misunderstood and curse Son Jung-yul to death.  "Don't go to his house to look for him. Every day at this time, he is giving lessons to a group of students downstairs. Look, there are none over there. He is the one teaching the students there." The old lady pointed  Said a shade tree in the community.  "Class? What class?" Fu Xin and the other four were confused. According to Tian Yusheng's explanation, Sun Zhenglu had already retired at this time. How could he still teach students? This is impossible!  And a very important point, Tian Yusheng had mentioned before why she had never been to Sun Zhenglu's home, because Sun Zhenglu lived in the faculty dormitory when he was attending classes at the Offshore Electric Power College.  The four of them, full of suspicion, thanked the old lady, parked the car, picked up the gifts, and walked towards the shaded area pointed by the old lady.  As I walked closer, I saw six or seven high school students sitting under the shade of a tree, listening to the class attentively.  On the tree in front of them, there was hung a blackboard that seemed to be a bed board painted with black paint. On the blackboard, written in slaked lime: "Lenz's law: The induced current has such a direction that the magnetic field of the induced current will always hinder  "The change in the magnetic flux that causes the induced current." "In front of the blackboard, there is an old man with sparse gray hair, explaining to the children who look like high school students: "The expression of Lenz's law can be summed up as: 'The effect of induced current.  always resists the cause that causes it. ' If the induced current in a loop is caused by a change in the magnetic flux passing through the loop, then Lenz's law can be specifically stated as: 'The magnetic flux produced by the induced current in the loop is always  Resist (or hinder) the change of the original magnetic flux. ' We call this expression a flux expression. The effect of the induced current here is to generate magnetic flux in the loop; and the cause of the induced current is the 'change of the original magnetic flux'.  . You can use twelve words to image memory 'increase and reduce the same, to block the stay, increase the expansion.  The specific expression is: 'The magnetic force (Ampere force) exerted by the induced current on the moving conductor always opposes (or hinders) the movement of the conductor. ' We might as well call this expression a force expression, where the effect of the induced current is the magnetic field force;  The cause of the induced current is the movement of the conductor cutting the magnetic field lines. It can be seen from the above statement of Lenz's law that Lenz's law does not directly indicate the direction of the induced current. It only summarizes the principle of determining the direction of the induced current.  The procedure for determining the induced current" Fu Xin and the other four stopped, not daring to come forward to disturb the attentive teacher and several attentive students. They just stood behind the big tree. Fu Xin was afraid of disturbing these people.  , lowered his voice and asked Tian Yusheng: "Is this your teacher, Mr. Sun Zhenglu?" Tian Yusheng nodded and replied: "This is my teacher, Mr. Sun Zhenglu, but the teacher looks better than Qi or Ba  When I was studying with him years ago, I was much older" Fu Xin looked at Sun Zhenglu and saw that he was about 1.7 meters tall and his body was as thin as a bamboo pole.  His hair was sparse and gray, and his eyes seemed to have cataracts, without much brilliance.  Fu Xin's eyesight was very good, and he also saw that the veins on Sun Zhenglu's head were exposed.  Since there were seven or eight students around him, and the lecture was held outdoors without the obstruction of walls, the sound waves spread very quickly, so he tried his best to raise his voice, but after all, he was short of breath, and his voice often became weak after saying a few words.  I had to stop to take a breath and occasionally drink a sip of water before continuing.  "Mr. Sun is really an old man with great ambitions. It's really amazing that he still gives extra lessons to the students at such an old age!" Fu Xin said with admiration.  Tian Yusheng nodded and replied: "Teacher, he has always liked the profession of teacher, otherwise he would not have come to our school as a visiting professor. After all, his real profession is a researcher at the Electrical Research Institute. Because he likes the profession of teacher,  He likes to preach and teach, so he came to our school. However, compared to the past, his voice is far less loud than before!" "I'll tell you about Lenz's law too," Fu Xin asked in a hey voice.  , the smile on his face proved that he did it on purpose.  Tian Yusheng's face turned red, "Mr. Fu, don't tell me, this is really true. Although Lenz's Law is a content in high school now, at that time, there was no way to learn so much scientific and cultural knowledge in high school. It was all done by the committee.  "It was written by the committee of the Communist Party of China. The content is simple. We didn't learn Lenz's Law at all when we were in high school." Fu Xin couldn't help but laugh at it deliberately. He understood what was going on with the textbooks of that special period.  , the textbooks at that time were different from those at other times.They are all the same, all compiled by that committee.  ??Almost all textbooks at the time had "Supreme Instructions" on the cover.  Whether it is mathematics, physics, chemistry, or literature and history, it is full of long quotations and critical clich¨¦s, with very few real knowledge points.  Because there are not enough knowledge points in the textbook, the textbook is not as step-by-step as other times, but very simple.  How simple is it?  Simply put, the content of the physics book is condensed into "three machines and one pump", that is, tractor, diesel engine, electric motor, and water pump!  The living things are summarized as "three major crops and a pig"!  If such textbooks are used to teach, how can one learn anything about Lenz's law?  PS: I just discovered that the chapter name of Chapter 6 is repeated, but the content is not there. Jump to it now.  So Chapter 12 was not missed.  (To be continued. Please search Piaotian Literature, the novels will be better and updated faster!)
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