Scholar’s Starry Sea

"Come on, have a cup of coffee, and continue to practice tonight."

Wu Bin in the laboratory put the coffee he just bought on Lin Ziqi's table and said.

Faced with this sudden surprise, Lin Ziqi happily picked up the coffee cup and said, "Thank you~Where did you buy it?"

"Which Winter Story at the door, coffee It tastes pretty good." Wu Bin replied casually.

"Why did you suddenly think of going to the coffee shop?" Lin Ziqi asked curiously.

"Talk about patents."

"Oh oh, how are you talking?"

"The preparations are finished, and the rest is Wait for the result."

"It's great~" Lin Ziqi looked enviously, then picked up the phone and glanced at it suddenly and said in a hurry: "Aiya, I have to go to class, thank you for the coffee. "

"Remember to come back to write a paper tonight."

"I see, Professor Wu!" Lin Ziqi ran out of the laboratory after making a face at Wu Bin.

"Well...I almost have to go to the classroom." Wu Bin glanced at the time, then walked back to his place and picked up his schoolbag.

The academician Chen Xianhui gave him a comprehensive course, from advanced Quantum mechanics, Quantum field theory, electrodynamics, introduction to condensed matter Physics in superconductivity theory to applied superconductivity engineering, electromagnetics, Heat transfer, fluid mechanics, etc. are all available.

Because Wu Bin is basically soaked in the laboratory a while ago, I haven’t been to a few classes so far. At this moment, taking advantage of the gap in patent applications, Wu Bin just took these classes Made up.

But for Wu Bin, it is not so much that he is going to class, it is more that he wants to hear more insights and ideas about superconductivity.

After all, in terms of his self-learning ability, he had learned these related courses as early as his freshman year. After that, he had read more than hundreds of documents from various countries.

As far as his current understanding is concerned, applied superconductivity is much more friendly than theoretical superconductivity research, because the content of applied superconductivity can still be seen at any rate, and everyone can get together during the experiment. The results are discussed.

But the theoretical superconductivity is completely different. If you learn this stuff a little deeper, you will see pitch black. All the world Physics Masters are walking in the dark, and whenever this group of people surround It is light to slam the door when discussing together. It is common for two friends to suddenly upgrade to Facebook scolding while chatting.

As for why this is the case, a simple metaphor is that blind people touch the elephant. No one knows where the future of superconductivity is, so some say it is long, some say it is thick, some say it will Spray water.

In short, everyone firmly believes that what they are walking is the road to the truth, otherwise how can they stick to it?

After arriving in the classroom, Wu Bin sat in the third row, which was relatively empty. As soon as he put down his bag, he found an acquaintance of him walking in from outside the classroom.

'It turned out that Professor Cheng taught this class. '

Professor Cheng Guangji Quanmin is an Academician student in the Department of Physics and Astronomy at the University of Pittsburgh. After returning to China, he has been devoted to the study of Quantum nanoelectronics. For a while, Wu Bin often discussed the condensation of low-latitude experiments with him. Physics problem.

When Wu Bin saw Cheng Guangji, Cheng Guangji also saw him. He smiled and raised his hand to say hello to him. Wu Bin immediately waved his hand and laughed at him.

After about half of the classroom was seated, Professor Cheng stood on the podium and picked up a piece of chalk.

[Green's function]

After writing four large characters on the blackboard, Cheng Guangji turned around and asked with a smile: "Which student can explain the Physics meaning of Green's function?"

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"..."

The students underneath are all inexplicable, wondering what happened to Professor Cheng today. As soon as the class started, they asked the question what the hell is that? I haven't said it yet!

However, when everyone is lost, Wu Bin is frowned and realizes that things are not simple.

Sure enough, after a short silence, Cheng Guangji smiled and opened the mouth and said: "Come on, the male student in blue clothed clothes sitting in the middle of the third row, get up and talk about it."

"..."

A speechless Wu Bin stood up slowly, not knowing where he had offended this Professor Cheng. He clearly said hello with a smile just now, why suddenly he was in trouble Woolen cloth! ?

When Wu Bin stood up, the surrounding students couldn't help but focus their attention on him, wanting to see who was so unlucky, but most people's first reaction was.

"I haven't seen this one..."

But many people cry out in surprise, "Isn't this God Wu!?"

That said, everyone around me also remembered.

'This is the big guy who graduated from the sophomore year. '

Whether it's the Guo Prize or the graduation ceremony of one person, Wu Bin can be regarded as having a sense of presence in the University of Science and Technology this year, making it difficult for other people to know it.

"Okay, quiet, quiet!" Cheng Guangji slapped the podium and shouted.

In a short time, after the classroom was quiet, Cheng Guangji looked at Wu Bin again and said with a smile: "Classmates, please answer."

A didn't know whether to cry or laugh Wu Bin opened the mouth and said: "In Physics, there are a large number of non-homogeneous differential equations with boundary conditions or initial conditions."

"And these differential equations are essentially In describing the relationship between the source and the field, there is a good method called the Green's function method. The function obtained by it is called the Green's function. In fact, the Green's function corresponds to a field."

"Well, that's good." Standing on the podium, Cheng Guangji patted his hands twice, and then said, "The rest... It's probably more troublesome in terms of language, so you should come to the stage to demonstrate. "

"??"

Wu Bin, who was once again caught up in ignorance, had to slowly walk up to the podium under the watchful eyes of the classmates, and received the process Mitsuji smiled and handed it out. Of chalk.

Take a deep breath, and Wu Bin wrote on the blackboard: “Generally speaking, the definite solution is equal to the general solution plus boundary conditions, and the general solution is equal to the integral. But if you use Green’s function to solve it, a new kind of Idea."

Wu Bin drew a line on the blackboard, and then an irregular figure was yellow on the line.

"In unbounded space, if there is an irregularly charged body with a charge density of rho(r'), it should be noted that this is the field source of any part."

"Then it will excite an electric field in space, and the TV generated in space r is divided and superimposed by wireless."

Said Wu Bin began to list formulas on the blackboard.

[∅(r→)=4πε1∫∫r→-r→'p(r→')dr→']

"Dr'→ means not only It is only a vector, and it is also a volume element. The electric potential at a certain point in space is uniquely determined by the charge density distribution."

Looking at the students who are taking notes below, Wu Bin said: "We know that there is no The boundary condition problem has a solution but not unique. Given the boundary conditions, the problem can have a unique solution. Then how to obtain the arbitrary distribution of charge density and the potential under arbitrary boundary conditions through the superposition of point charge potentials?"

"At this time, the question is, what kind of boundary conditions do we need?"

And when everyone was looking at Wu Bin curiously, Wu Bin suddenly turned around and said to Cheng Guangji "Professor Cheng, I don’t understand the next part, so I’m asking you for advice."

Cheng Guangji was taken aback after listening, then laughed heartily: "Yes, you are slippery." laughed After taking the chalk from Wu Bin's hand, he said: "Okay, go down, go down, come to class more if you don't understand, right?"

"I know."

Relaxed Wu Bin returned to his position, and he almost knew why this Professor Cheng suddenly targeted him. It is estimated that he would express his dissatisfaction with him until he came to class for so long. There is no malice. .

Wait for Wu Bin to sit back and Cheng Guangji picked up the chalk and wrote under Wu Bin’s formula: "For the definite solution problem, we can give a general Poisson equation..."

……

With the sound of a piece of light music, Cheng Guangji, who was filled with several blackboards, announced the end of get out of class.

While Wu Bin was packing his schoolbags, two girls sitting in the front row suddenly walked towards him.

"That...Hello." The taller girl first stepped forward and waved to Wu Bin.

"Hello." Wu Bin nodded towards her.

"We think you explained the Green's function very well when you first started the class." After speaking, he lowered his voice and said, "Actually, you know how to continue to explain."

Wu Bin hurriedly waved his hand after listening: "no no no, I really don't know, how else would I come to Professor Shangcheng's class."

The two girls both chuckled slightly after listening. The expression on his face was obviously unbelieving.

After the laugh, the tall girl said again: "Actually...we came here to learn from the experience and ask the gods for some learning experience."

"The gods are exempt. If I can help, I will definitely answer."

The tall girl clapped her hands and said happily: "The big divine fruit is close to the people. In fact, we two have been abused by graduate students in the first few weeks of school. ! I don’t know if it’s because of the large span of undergraduate majors or the large professional level. Anyway, I really don’t understand in class."

"Some great tutors often use Chinese and English mixed methods to tell us about their respective fields. The frontiers of my research or my own laboratory’s research progress sounded very high... But after the class, I felt that I hadn’t learned anything and my IQ was crushed. I have recently wondered whether choosing to study for graduate school was the right choice... …Now I feel like a fake antique mixed into the museum, how I don’t fit in."

The other girl is also nodded on the side, looking very annoyed.

"This..." Wu Bin thought for a while, "Which classes do you find difficult to understand?"

"Well...high volume, field theory, group On Quantum Physics......"

As she talked about the tall girl, her face blushed, because she seemed to have holes all over her body......

In order to break the embarrassment, Wu Bin first replied : "Well... You two want to enter the field of superconductivity when you take these courses? In this case, I actually recommend you to read more literature. The scope of this field is too large, and every course in it is not easy. If If you really feel that you can’t keep up, I suggest that you also try application-based courses. Maybe you will find what you are good at."

PS: Just get home, write a chapter first, wait a minute Continue.