I am a sophomore in the Department of Physics. I often meet my classmates who don’t understand thermal management and ask me if there is any good online course recommendation. I said reading books is fine. Is the thermal management of Kardar, Wang Zhuxi, and Ma Benkun not enough? They said that they couldn’t stand it, and it was better to attend the class. I wonder, can you learn physics just by listening to class? Don’t you need to read more to get a sense of it? Uri!
The feedback they gave me is that I can’t stop reading a book. My advice to them is to meditate hhh. Sometimes I feel that listening to online classes is also a kind of “laziness”. I used to rely on online courses for a while, but I didn’t want to find a good book to read. Now I feel that reading a book quietly can really digest knowledge. It is a completely different feeling from listening to a class. Reading a book gives me a feeling of “chewing slowly”, I like it!
My personal experience, online classes are more guiding and enlightening, but they are by no means all of the learning. On the contrary, we should go one step further, read books and digest, chew up knowledge, and turn it into our own. On this basis, we will find excellent courses to be inspired!
I am still very worried that many physics students in Chinese universities do not like to read good books and good textbooks!
It is not clear about the current learning status of the students. Only share some personal experiences. Listening to lectures and reading books are all part of learning. There are two other activities when I study by myself: 1) Go to the library to check related books and literature. Because in the books I read, there are many references in the footnotes (such as Peng Huanwu, “Theoretical Physics Fundamentals”; Wang Zhuxi, “Thermodynamics (Second Edition)”; Han Degang, Gao Zhidi, Gao Panliang, “Physical Chemistry”). 2) Get this exercise set and do it. This is what I learned from my classmates in Jiangsu Province in my freshman semester after my freshman year. When I was in college, the college entrance examination rules in Jiangsu Province changed almost every two years. Students had no reference to previous years of experience and could only practice basic skills diligently. My classmates taught me that to learn to understand, I still have to do exercises. Later, I saw Dick Feynman said that learning physics without doing problems is equivalent to wanting to give birth to children by communicating and making pen pals. I feel the same. I saw someone mention Yang Zhenning. He once recalled his experience of listening to “differential geometry” when he was studying at Southwest Associated University. He said that what the professor said was not good, so he should follow the textbook; he just took the exercises 1, 3, and 5 on the homework book. , 6 also did. Therefore, there is a contradiction in listening to the lectures, that is, you choose interesting courses, and there is no guarantee that the professors who teach will also make you interested. I communicated at Shandong University back then. I felt that I had come to the center of mathematics. I hurried to listen to “functional analysis”. As a result, the professor was about to give birth to children. He couldn’t be tired. The voice was very small. I used a small piece of paper to make an outline to derive the theorems in the book, and I didn’t play much. I can’t hold on after listening to a lesson. Later, when I listened to “Engineering functional analysis” at Southeast University in Sipailou, Nanjing, the professor spoke interestingly. It was also very interesting to listen to colleagues talk about real variable functions in 2019. Therefore, the quality of this lecture varies from person to person and is not uniform. Another example is that I listened to the “Physical Chemistry” of Shandong University. I thought that they would have more class hours, which would be more in-depth and thorough than the “Physical Chemistry” of my alma mater, Tianjin University. The result was disappointing. What’s new. The extra time is used for students to give lectures on topics of interest to them. If you want to understand some things, you still need to learn by yourself. But listening to lectures is not the same as listening to lectures. I did not do well in the first semester of “Physical Chemistry”. Later, the roommate in the same dormitory took part in a re-study class for the evening lecture due to the suspension of subjects. He said that the lecture was an old professor who was re-employed after retirement. In the end, my roommate in the department scored more than 80 points, which was more than a dozen points higher than my one-time use, which made me very embarrassed. Interesting lessons are very interesting. Listening to the “polymer physics” by Teacher Zhang Jie of Shandong University, not only can I learn some knowledge, but also listen to her daily life of the university’s green peppers, and get a glimpse of the suffering and happiness of intellectuals, which is a different kind of enjoyment. After listening to the class, I can still think about life. It is really “one piece worth five pieces”. In the same way, if you listen to Feng Dacheng’s lecture on “quantum chemistry”, you can listen to him for five hours of continuous lectures, and you will be more and more energetic and appreciate the style of a generation of scholars. The same is true for teacher Xiong Shijie of Nanjing University. His doctoral dissertation is the first batch of outstanding doctoral dissertations in China. It is available in the school history museum. Dozens of PPTs of his “computational physics” can be taught for a semester, and there are many paragraphs in class. I am amused myself first in the lecture. Not to mention the “Advanced Quantum Phase Acoustics” of Teacher Li Jun. And Liu Zonghua from East China Normal University talked about “Quantum Statistical Physics”. The beginning of the chapter was about the real number field, which gave me a taste of “Hilbert Hotel.” All of the above cannot be felt when reading textbooks. Although some professors continue this style into their writings, it is inevitable that they will not be missed. Even the public class is not good. Teacher Li Jun faces the camera, and the dirty mouth in his mouth can’t be played out. After all, the ten fingers are not uniform. In a university, there are always excellent courses, and water courses are always inevitable. Back then, the “Structural Chemistry” of Tianjin University and Shandong University were all based on the script. I didn’t learn anything. Now I don’t have any impression of the above two courses. It is estimated that one of the valuable qualities that need to be cultivated in universities is that they can still pass the exam even if the teacher is at an average level. But as far as my personal habits are concerned, when I come into contact with a completely unfamiliar topic, I still look for public lectures or handouts. Because textbooks tend to have a lot of content, and they don’t know which books are better in unfamiliar fields. If you want to appreciate its core knowledge, the lecture content of the course is small, so it is easier to get the whole picture. For example, I recently paid attention to the related technologies of Alpha Fold. Among them, I don’t have some knowledge of bioinformatics. In addition to looking for some books in the library, I also found the open class of Bioinformatics at Peking University on station B. I read some of the content and learned about Multi-Sequence Alignment. Here I also recommend it to readers who have passed by. The course is divided into multiple sections, each section is only about ten minutes, very suitable for getting started. I recalled the pros and cons of attending classes, let’s talk about reading. Both Chinese and foreign textbooks have the kind of “books that have been turned into lectures”, with dry content and little use. In particular, some books do not even write about the logical relationship of knowledge, and the books become scattered pearls, or technical manuals, which will make readers very troublesome to read. At this time, I used to go to the library and look for other books to see if there was a detailed explanation. But opening many books at the same time will greatly slow down the speed. Although I have always advocated “to go through a book first, and to have a general understanding of the knowledge described in the book”, looking back on my 20 years of schooling, I find that I have never read only a book. . The book selection here is also very important. I generally read according to the books quoted in the articles I read, but I don’t rule out stepping on pits. David Chandler’s “Modern Introduction to Statistical Mechanics” is a book cited by everyone in the circle, and it is very difficult for me to read it. Later, I read Pathria and then came back to read this book, and I felt a sense of “sudden realization”. The bottom line is that Chandler’s book applied a lot of knowledge of density matrices, but did not spend time on density matrices! In addition, some of his explanations were copied directly from T. Hill’s book, but he did not copy all of them. But I have this skill, is it not good to just read Pathria? It is better to read Kerson Huang’s book again than to get stuck on this book. I still regret struggling with this book for a long time when I was young and had time. So it is not easy to understand with a thin book. For the same reason, there is a “Statistical Field Theory” that is very thin… there are more pits in reading literature, so filtering the essence from a large amount of text is also a basic skill. Finally, remind young people: Did Einstein take online courses? Did Einstein come up with the theory of relativity because he got an A in the “Theory of Relativity” course? Did Einstein come up with “Relativity” exercises and put forward the Theory of Relativity? I think the establishment of scientific literacy and taste is a more important task during college than studying a few courses. In fact, Einstein was denounced as “a lazy dog” by his mathematics teacher Minkowski because he didn’t listen well in class. And because of lack of relevant mathematics, Einstein had to come back and relearn mathematics with Minkowski and his former classmates in the process of studying the theory of relativity. But everyone knows that Einstein’s five papers in 1905 laid the foundation for several disciplines. The Nobel Prize work of Yang Zhenning and Li Zhengdao back then was the biggest physical effort, which was to put together all the experimental results including parity and check them one by one. These are all “hands-on skills” outside of textbooks, that is, put forward an idea, and then design a set of methods to test your own ideas. I recently had a phase change job. I felt that a method I used during my Ph.D. period would definitely be able to simulate the phase change of molecular crystals. I asked students to do it. It really is. There is also an important ability to continue thinking about problems. As long as you search, you will find that Max Planck conducted long-term research on black body radiation from 1894 to 1900 and published many papers. As far as 1900 when he put forward the light quantum hypothesis, he had two papers discussing this topic. Attendance can only understand the greatest common divisor of the course. To truly gain something, you need to continue studying during the holidays. This is the learning method that I learned after consulting with the teacher after class when I was in my sophomore year. Share it with everyone here. Another advantage of lectures is that you can report the cutting-edge developments involved in this course at any time. After all, the timeliness of a book is limited. Here is a section of “Computational Physics (Graduate)” I taught to give everyone a taste.