Chapter 74 Mathematical Model
The first session in the afternoon is an outline of modern history, and Xu Qingzhou cannot escape this lesson.
At 1:50, the four of Xu Qingzhou arrived at the classroom. As soon as they entered the classroom, they felt everyone's eyes on him.
Zhang Shuyi and Xue Ying sat together, waved their hands, and asked Xu Qingzhou and the others to sit in the row behind them, and then inquired about the news: "Xu Qingzhou, how did you apply to join the professor's project?"
"By chance, I met Professor Gu. The School of Physics needed someone, so I went over there. In fact, I was just doing odd jobs."
Xu Qingzhou said with a smile.
"Even doing odd jobs is awesome, it's a professor's project." Zhang Shuyi sighed.
Xue Ying kept her eyes on Xu Qingzhou and nodded in agreement: "Yeah, I didn't expect you to be so good at mathematics. If we have something that we don't know in the future, we can come and ask you for advice."
"I just learned a little bit in advance." Xu Qingzhou smiled modestly.
On the side, catching Xue Ying's strange look at Xu Qingzhou, Xu Zhengyang sighed with emotion. Fortunately, he already has Dong Shan, otherwise, he might die of acidity.
At this time, the teacher wearing glasses walked in, and everyone stopped talking and waited for class.
The class passed like this. The teacher's speech was smooth and even Xu Qingzhou almost fell asleep.
After class, Xu Qingzhou came to the library with his computer on his back, continued working on his paper, and went directly to the classroom to attend the class meeting in the evening.
Library of several institutes.
Xu Qingzhou turned on his computer and found that he had received two emails.
The first one is an email from the editorial department of "Mathematical Invention", indicating that the manuscript has been accepted. This part is mainly for the editor to make a preliminary evaluation of whether the manuscript meets the positioning of the journal to which it is submitted and the innovativeness of the manuscript.
Quite fast.
The time passed at this stage is not certain and depends on the speed of the editing process.
The second email also came from the editorial department. Xu Qingzhou was a little surprised. The email showed that the manuscript had entered the "AwaitingReviewerAssignment" link.
Under normal circumstances, after a 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. The specific waiting time depends on the reviewer's schedule.
Xu Qingzhou shook his head and closed the mailbox. There was no need to rush this matter, especially for a young Kalami like him who had no reputation before. It was considered fast to pass the preliminary examination so quickly.
The second paper has reached the final stage.
This article was almost all familiar content, so he planned to submit it directly to PhysicsReports (Physics Reports), an authoritative international physics journal in physics and interdisciplinary sciences.
Time passed by minute by minute.
Xu Qingzhou wrote very seriously. When he came to his senses, he realized that it was already six o'clock and the class meeting would start in 15 minutes. He packed up his things and went to the classroom.
In the classroom, most of the classmates have arrived.
Zhu Sitong was the first to speak on stage, reminding everyone to officially start the school year and study attentively. Then he got to the point and said some words of encouragement to encourage everyone to sign up and contribute to the class.
Kong Xianbo and Zhang Shuyi were the only candidates to run for squad leader.
Of course, other students might also want to give it a try, but they thought that Kong Xianbo and Zhang Shuyi were busy with everything in the class during this period, so they just went ahead and it would be embarrassing if they only had the few votes in the dormitory, so they gave up. .
Zhang Shuyi went up first and talked eloquently. She was very confident, but the content was very different from Kong Xianbo's first draft. She emphasized that she had been a class monitor and held various class committee positions before, and could serve everyone well. After her speech, she stepped down with strong applause. . Then we arrived at Kong Xianbo. This guy came on stage, adjusted his glasses first, and said: "Hello everyone, my name is Kong Xianbo. As you can see, I am standing here to run for class president."
The speech styles of the two people changed instantly. Even Zhu Sitong was a little surprised. He was originally very optimistic about Zhang Shuyi. There was nothing wrong with her speech and she was impassioned, but now he seemed to think that Kong Xianbo was also very good.
Even Zhu Sitong felt this way, and of course other students did too. They felt the sincerity in Kong Xianbo's words.
At the end of the voting, Kong Xianbo had 30 votes and Zhang Shuyi had 28 votes. The former became the squad leader and the latter became the league secretary.
Xu Qingzhou didn't care much about this. After the class meeting, he bought some bread on the way and continued to visit the library.
The next day.
There was no class on Tuesday morning, so Xu Qingzhou got up early, went to the cafeteria to have breakfast, and arrived at the laboratory on time.
Wang Wei and Gong Yunfei were standing in front of the instrument, conducting sample testing, collecting data on the sample's lattice structure, element distribution, magnetic field status, etc.
"Junior brother." Wang Wei looked much more energetic than yesterday and asked with a smile: "Professor Zhao told you about our project yesterday, right?"
"Well, I roughly understand it." Xu Qingzhou nodded.
Wang Wei pointed to the computer screen: "All the experimental data have been uploaded to the computer. There is also a data page on your desk. Let's take a look at this set of data first. Have you found anything strange?"
"That's not right. The peak value seems to be too high." Xu Qingzhou saw the problem at a glance. At a temperature of 70°C, the resistance value suddenly increased to 0.01Ω.
Wang Wei sighed, "Yes, this is the troublesome thing. In addition to the huge experimental data, the data must be cleaned, using the IQR method to remove noise and outliers, and then build the model on this basis."
"The jobs were complicated and I wasn't very good at math."
"So we need a professional who is proficient in mathematics to help us figure this out."
Xu Qingzhou walked to his desk, flipped over the data paper, thought for a moment, and said seriously: "I can give it a try, it shouldn't be a big problem."
"I still have to go to the materials laboratory to supervise the production of samples, and I'll leave it to you here. However, we are pressed for time, so I will check the progress with you in three days."
Wang Wei gave it a moment. He didn't doubt Xu Qingzhou's talent in mathematics. If he could be taken over by Professor Zhao, he must have some ability. But after all, the other party was in his freshman year and might not have even done experiments, and in the field of pure mathematics It is different from applied mathematics.
"I'll try to be as fast as possible." Xu Qingzhou understood what Wang Wei meant.
Wang Wei nodded, didn't stay any longer, and left in a hurry: "Okay, I'll leave this place to you."
Xu Qingzhou sat down in front of the computer, looked at the data spread out on the table, and thought about where to start.
The data is indeed very complex and can give people a bit of a headache.
I don’t know how to start with a big model, maybe. Xu Qingzhou’s eyes darkened, he could do it step by step, peeling off the cocoon and pulling out the silk, just like building a building, accumulating bricks one by one.
First, the electromagnetic characteristics analysis model and the heat conduction analysis model are established separately. Finally, the solutions of the electromagnetic field and heat conduction equations are updated simultaneously during the solution process, and then the models are coupled.
Maxwell's equations (differential form):\begin{align*}\nabla\cdot\mathbf{E}&=\frac{\rho}{\varepsilon_0}
Superconducting equation of state: J\leqJ_c(T, B)J≤Jc(T,B)
Fourier’s law of heat conduction (three-dimensional):\frac{\partialT}{\partialt}=\alpha\left
Xu Qingzhou took out the scratch paper and wrote on it Write down a few equations and exhale slowly.
This is a good start.
(End of chapter)