Chapter 74: Mathematical Model

The first class in the afternoon is the outline of modern history. Xu Qingzhou cannot escape this class.

At 1:50, the four of Xu Qingzhou arrived at the classroom. As soon as they entered, they felt everyone looking at them.

Zhang Shuyi and Xue Ying sat together, waved their hands, let Xu Qingzhou and the others sit in the row behind them, and then inquired: "Xu Qingzhou, how did you apply to join the professor's project?"

"By chance, I know Professor Gu, the School of Physics needed people, so I went over. Actually, I'm just doing odd jobs."

Xu Qingzhou said with a smile.

"Even doing odd jobs is amazing. That's a professor's project." Zhang Shuyi sighed.

Xue Ying's eyes had been on Xu Qingzhou, nodding in agreement: "Yeah, I didn't expect you to be so good at math. In the future, if we have anything we don't know, we can ask you for advice."

"I just learned a little in advance." Xu Qingzhou smiled modestly.

After class, Xu Qingzhou carried his computer to the library to continue working on the paper, and went directly to the classroom for the class meeting in the evening.

Read! {

Wang Wei and Gong Yunfei were guarding in front of the instrument, testing samples, collecting data on the lattice structure, element distribution, magnetic field state, etc.

Quite fast... The time through this stage is uncertain, depending on the speed of the editor's processing work.

Wang Wei sighed, "That's right, this is the troublesome thing. Besides huge experimental data, you have to clean the data, use the IQR method to remove noise and outliers, and on this basis, build the model."

Time passed second by second.

Xu Qingzhou didn't care much about this. After the class meeting ended, he bought a piece of bread on the way and continued to soak in the library.

In the classroom, the students had basically arrived.

"I'll try to be fast." Xu Qingzhou understood Wang Wei's meaning.

Xu Qingzhou wrote very seriously. When he came back to his senses, he found it was already six o'clock, and the class meeting would start in 15 minutes. He packed his things and went to the classroom.

The first letter was an email from the editorial department of *Inventiones Mathematicae*, showing that the manuscript had been accepted. This part is mainly the editor's preliminary evaluation of whether the manuscript meets the positioning of the journal and the innovation of the manuscript.

The second email was sent ten minutes ago.

What surprised him was that the second paper had also been accepted by the editorial department of *Physics Reports*, also without modification requirements, and began to assign external reviewers.

Wang Wei nodded, not staying any longer, and left in a hurry: "That's fine, I'll leave it to you."

"These tasks are very complicated, and I'm not very good at math."

On the side, capturing Xue Ying's strange look at Xu Qingzhou, Xu Zhengyang sighed. Fortunately, he already had Dong Shan now, otherwise, he might be sour to death.

The speech styles of the two were instantly different. Even Zhu Sitong was a bit surprised. He was originally very optimistic about Zhang Shuyi. The speech was no problem, generous and impassioned, but now... he seemed to feel that Kong Xianbo was also quite good.

Even Zhu Sitong had such a feeling, and other classmates certainly did too. In Kong Xianbo's words, they felt sincerity.

"So, we need a professional who is proficient in mathematics to help us solve this problem."

Under normal circumstances, after the preliminary review by the editor, the paper will enter the external review stage. The manuscript will go to 2 to 5 experts in the same field. This stage will be longer. How long to wait depends on the reviewer's schedule.

The voting ended. Kong Xianbo got 30 votes, Zhang Shuyi got 28 votes. The former became the class monitor, and the latter became the league branch secretary. Only Kong Xianbo and Zhang Shuyi participated in the class monitor election.

Of course, other classmates might also want to try, but thinking that Kong Xianbo and Zhang Shuyi had been busy with class affairs during this time, if they just rushed up, if they only got the votes from their dormitory, wouldn't it be very embarrassing, so they all gave up.

This one is almost all familiar content, so he plans to submit it directly to *Physics Reports*, an international authoritative physics journal in the field of physics and interdisciplinary sciences, after writing it.

Zhu Sitong spoke first, reminding everyone that school had officially started, to focus on learning, and then entered the topic, saying some encouraging words and letting everyone sign up actively to contribute to the class.

Xu Qingzhou opened the computer and found that he had received two emails.

At this time, the teacher wearing glasses walked in, and everyone stopped talking, waiting for class.

The next day.

"Junior." Wang Wei looked much more spirited than yesterday, and asked with a smile: "Professor Zhao has already told you about this project yesterday, right?"

Zhang Shuyi went up first, talking eloquently and very confidently. The content was not much different from Kong Xianbo's first draft, emphasizing that she had been a class monitor before and had various class committee positions, and could serve everyone well. After the speech, she went down under strong applause. Then it was Kong Xianbo's turn. This guy went up, first pushed his glasses, and opened his mouth: "Hello everyone, my name is Kong Xianbo. As you can see, I stand here because I want to run for class monitor..."

There is no class on Tuesday morning. Xu Qingzhou got up very early, ate breakfast on the way, and arrived at the laboratory on time.

Wang Wei pointed to the computer screen: "All experimental data have been uploaded to the computer, and there are data pages on your desk. You take a look at this set of data first, have you found anything strange?"

Wang Wei gave a time. He didn't doubt Xu Qingzhou's talent in math. Being able to be brought over by Professor Zhao, the ability must be there, but the other party is a freshman after all, maybe he hasn't even followed an experiment, and pure mathematics and applied mathematics are different.

The second paper is already in the final stage.

!.

School of Mathematics Library.

Xu Qingzhou walked to his desk, flipped through the data paper, pondered for a moment, and said seriously: "I can try, there shouldn't be much problem."

"Hmm, roughly understood." Xu Qingzhou nodded.

"Not quite right, this peak seems too high." Xu Qingzhou saw the problem at a glance. At a temperature of 70C, the resistance value suddenly increased to 0.01W.

A class passed like this. The teacher spoke without any ups and downs, and even Xu Qingzhou almost fell asleep.

Xu Qingzhou sat in front of the computer, looking at the data spread out on the table, thinking about where to start.

Xu Qingzhou shook his head and closed the mailbox. This matter cannot be rushed, especially for a small shrimp like him who had no reputation before. Being able to pass the preliminary review so quickly is already fast.

The data is indeed very complicated, which will make people have a headache.

A big model doesn't know how to start, maybe... Xu Qingzhou's eyes sank, he can do it step by step, peeling the cocoon, like building a big building, accumulating brick by brick.

First build the electromagnetic property analysis model and thermal conductivity analysis model separately, and finally perform model coupling by simultaneously updating the solutions of the electromagnetic field and thermal conduction equations during the solving process.

Maxwell's equations (differential form): \begin{align*}\nabla\cdot\mathbf{E}&=\frac{\rho}{\varepsilon_0} Superconducting state equation: j\leq j_c(T, B) j \leq j_c(T, B) Fourier's law of heat conduction (three-dimensional): \frac{\partial T}{\partial t}=\alpha\left Xu Qingzhou took out draft paper, wrote down several equation sets on the paper, and slowly let out a breath.

This is a good start...

(End of chapter) ===== CHAPTER 75 =====