Great Country Academician

Chapter 727: Research theory on simulated neural signals and electrical signal conversion based on quantum theory

As the New Year passes, even in the city, the flavor of the New Year gradually becomes stronger.

The campus of Nanjing University is deserted. Ordinary college students have already left the school during winter vacation.

In the office, Xu Chuan is also giving the last small class of the year to several students he teaches.

Different from undergraduates, graduate students, whether they are masters or doctoral students, do have winter and summer vacations according to regulations, but the length of winter and summer vacations generally depends on the conscience of the supervisor and the projects they are working on.

If you don’t have a project in hand when the winter and summer vacations are approaching, and the instructor is good, the winter and summer vacations will be longer, and it is not impossible to follow the undergraduate students or even take the vacation earlier.

If you are busy with the project at hand, or if the tutor's "exploitation" is serious, the winter and summer vacations for graduate students can be said to be almost limited.

Of course, Xu Chuan is not an unscrupulous tutor. The few students who studied with him have not left on vacation yet because of their own volition.

Because as the year is approaching, the probability of their mentors appearing on the NTU campus is much greater than usual.

Especially when the projects at Xinghai Research Institute and Chuanhai Materials Research Institute were suspended or progressed slowly due to the new year, Xu Chuan would take the initiative to give them some targeted small lessons.

These are rare opportunities that usually don't exist.

As for this rare opportunity, no one will let it go, whether it is Ding Rui, who is studying for a PhD, or Rong Xinji, who is studying for a master's degree.

In addition, there are three seniors, Amelia, Gu Bing, and Cai Peng, who all graduated with extremely excellent results. The psychological pressure on these people is undoubtedly great.

Seizing every opportunity to study hard and acquire knowledge is the only thing they can do.

"., Under normal circumstances, the exact solutions to these partial differential equations cannot be given explicitly, such as finite difference method, finite element method, spectral method, etc. But the accuracy order of numerical formats is for global errors."

"However, in the precision order of numerical value formats, there is a type of problem that is relatively easy to study based on accurate solutions to partial differential equations. Does anyone know what type of problem it is?"

In the office, with nothing to do, Xu Chuan gathered several students together and gave them a small class, giving them a simple explanation of the knowledge in the field of partial differential equations.

However, for him, these simple knowledge were obviously not so easy to understand in the eyes of several students.

In the rows of offices, apart from Gu Bing, who had already graduated, the other students were more or less listening attentively with frowns and sullen faces.

Hearing Xu Chuan's question, Rong Xinji, who specializes in differential equations and partial differential equations, quickly raised his hand and answered: "The problem of time dependence."

Xu Chuan smiled and nodded, saying: "Yes, for time-dependent problems, starting from the accurate solution of the partial differential equation, the ratio of the numerical error introduced by only one step in the numerical format to the time step is the local truncation error. "

"So, in what sense does the "high-accuracy" format still maintain high accuracy when the partial differential equation is nonlinear and has discontinuities in the solution? Has anyone thought about this problem?"

Hearing this, everyone frowned this time, including Gu Bing, who had already graduated and was listening to the lectures, and fell into thinking.

Looking at the silent students in the office, Xu Chuan smiled and was about to speak when someone suddenly knocked on the office door.

A pretty figure walked in quickly with a bouncing step, holding a cake in her hand.

"Brother! Happy birthday!"

A sweet sound as clear as an oriole sounded in his ears, and Xu Chuan turned his head in surprise: "Why are you back?"

"Of course I'm coming back to celebrate your birthday." Xu Xiao smiled and raised the cake in his hand.

Xu Chuan glanced at her and said with a smile: "Don't do this, you don't hold it in every time you celebrate for me. What bad idea did you have this time?"

Having said that, he was still very touched that Xu Xiao came back from England all the way to celebrate his birthday. Although part of the reason for this is that this girl is taking advantage of this time to come back for the New Year holiday.

After all, his birthday is the day after the Chinese New Year, and there are only a few days left before the Chinese New Year.

Although there is no New Year custom in Europe and there will be no holidays at this time, it is not difficult for Xu Xiao to take a leave to come back to celebrate the New Year.

After all, she has a Nobel Prize-winning brother on her head. I am afraid that no professor will risk offending him to stop Xu Xiao from going home for the New Year.

Standing opposite, Xu Xiao, who was wearing a beige down jacket, pouted and said dissatisfiedly: "How can anyone talk about his sister like this? I came back from thousands of miles away to celebrate your birthday. Forget it if you are not touched, but you still say bad things about me! "

Xu Chuan glanced at her and said: "On my birthday in 2019, you defrauded me of five million. On my birthday in 2020, you defrauded me of another ten million. In 2021, you defrauded me of two million." There are more and more people every year. In name, they are celebrating my birthday, but in reality?"

Hearing the detailed figures, Xu Xiao smiled: "Isn't this all for research, brother? Besides, I didn't waste the money, and I still got results."

Xu Chuan said, dumbfounded: "As for the results you have made, I can find a biological research team outside and they can make them with only one-fifth of the funding. Do you believe it?"

This girl, with his support behind her, spends money lavishly.

However, he has always supported the expenditure on scientific research. If he did not support it, Xu Xiao would not be able to get funding from him again and again.

Besides, money is just a number to him, something he won’t take with him in life or death. He only has this one sister, so if he doesn’t give her flowers, who can he give them to?

Xu Xiao pouted and said: "Isn't it normal to spend some money on research, and experience is priceless!"

Xu Chuan glanced at her and said, "Tell me, how many more are you planning to cheat this year?

Hearing this, Xu Xiao suddenly changed his face, raised his finger with an energetic face and promised: "I won't ask you for money this time!"

Hearing this, Xu Chuan suddenly looked wary: "If you don't want money, what do you want?"

From the time he was tricked by this girl to the big one, he almost had a psychological shadow.

Seeing his brother's vigilant look on his face, Xu Xiao almost cried. He pursed his lips and shouted aggrievedly: "Brother! The trust between people! I am your dearest sister! I Can’t I simply celebrate your birthday?”

Xu Chuan smiled disdainfully: "You only need three words to celebrate my birthday, and you have to pay extra! It's more and more every time, and your trust in me has long since disappeared to the infinitesimal level."

In the office, when he heard this sentence, no one could hold back, and several students sitting in a row eating melon burst out laughing.

They never thought that one day they would hear the words "More money is needed" from the professor's mouth.

Xu Chuan didn't pay much attention. These students had been with him for almost two years. Except for the recently recruited Liu Jiaying, they all basically knew Xu Xiao.

Ignoring Xu Xiao, he looked at the students sitting in the office, knocked on the table and said.

"As for the question I just asked, about the meaning in which the "high-precision" format still maintains high precision when the partial differential equation is nonlinear and the solution has discontinuities, I leave it to everyone as a New Year's Eve question."

"When you come back after the new year, hand in each of your answers to this question and let me take a look."

Hearing this, the office suddenly burst into mourning.

Do they know that the professor’s ‘liveliness’ is so easy to watch?

This is good, the winter vacation time that is already limited has to be taken in. Is it really easy for them!

hateful!

After "personally" pouring a cup of hot water for his sister who had traveled thousands of miles to come back, Xu Chuan asked with a smile: "Have you bought a ticket to go back to your hometown?"

Xu Xiao warmed her hands with a glass of water: "No, bro, it's the New Year and I can't get tickets. You can buy them for me."

Xu Chuan smiled dumbly and said, "You came to my place because you wanted to take the car back home?"

Xu Xiao said with a smile: "I'm not here to celebrate your birthday, brother. How can I call it a slap in the face of a scholar? By the way, do you understand?"

Xu Chuan rolled his eyes at her and said nothing. He sent a message to Zheng Hai and asked him to help buy more tickets.

Of course, what he didn't know was that this message was actually unnecessary.

At his current level, whether he is traveling by high-speed rail or plane, the corresponding carriage or business class will basically be locked in advance, that is, the entire carriage or business class will only be available to him alone.

So even if you bring one more Xu Xiao, you don’t need to buy more tickets.

"Brother, have you admitted a new student?"

In the office, Xu Xiao glanced at the separated student room outside, and his eyes fell on Liu Jiaying, whom he had never seen before.

Although she had never seen it before, she always felt a little familiar.

Xu Chuan nodded and said, "You should know Liu Jiaxin's sister, Liu Jiaying, who used to go to school at Fudan University and only came to follow me two months ago."

Hearing this, Xu Xiao suddenly widened his eyes, opened his mouth and looked at Xu Chuan with surprise, and said blankly: "Sisters? Brother, you are too playful."

Xu Chuan interrupted her with a dark look on his face: "What are you talking about? What the hell did you learn while studying abroad?"

Xu Xiao stuck out his tongue and closed his mouth in embarrassment.

She happened to read a novel on the way back, and couldn't help but think of this.

Hey, you can't continue with this. If you continue, it will be a 404.

In the office, after the two brothers and sisters chatted for a while, Xu Xiao ran out to play with Liu Jiaying outside. Xu Chuan didn't pay attention. He sorted out the documents in the office and prepared to return to his hometown for the New Year.

After looking through the information, he sorted out the papers and materials related to quantum chemistry and uploaded them to the network disk to read during the Chinese New Year.

Compared to previous years, he has much fewer things in his hands this year.

Those large-scale projects, whether aerospace or strong particle collider, are currently progressing smoothly and do not require him to pay too much attention.

As for the rest, basically the managers of the laboratories and research institutes can handle it.

So Xu Chuan planned to take advantage of the free time during the Chinese New Year to brush up on information papers related to quantum chemistry.

He has established the interface theory of the microscopic substantive reaction process of electrochemistry, but extending it to the four major fields of traditional chemistry is still an extremely difficult and huge task.

We had a simple dinner together with several students and Liu Jiaxin, who came all the way from the Internet. After a small birthday party, the 23-year schedule also entered the countdown.

Returning to his hometown from Jinling, on the high-speed train, Xu Chuan read through the papers in his hand.

On the side, Xu Xiao was holding a mobile phone and not knowing what he was browsing.

Suddenly, she raised her head and looked over, and asked curiously: "Brother, by the way, when are you going to get married?"

Hearing this question, Xu Chuan was stunned for a moment and looked at Xu Xiao: "Why are you asking this suddenly?"

In the business class, Zheng Hai and Tang Sijia in the back row also pricked up their ears.

This person's marriage is a really big deal.

Xu Xiao thought for a while and said: "After yesterday, brother, you are already twenty-six and twenty-seven. At this age, all the brothers of your age in the village are married, and you are the only one left."

Xu Chuan smiled: "What, they are all married, do I have to get married?"

Xu Xiao shrugged and said, "Not really, but you told your mother before that you would consider getting married when you were thirty, but by the time you are thirty, Sister Jiaxin will be thirty-one."

Xu Chuan paused and looked at Xu Xiao blankly.

"What's wrong? Brother?" Xu Xiao asked curiously.

After coming back to his senses, Xu Chuan shook his head and said softly: "It's nothing."

In the business class, the atmosphere was suddenly silent for a while.

Xu Chuan didn't know what he was thinking while holding the paper in his hand, and Xu Xiao on the side didn't say anything.

High-speed trains roar across the vast land, and during the Spring Festival, tourists returning home are everywhere.

Xu Chuan, who was looking at the passengers outside the window and didn't know what he was thinking, came back to his senses, looked at Xu Xiao, and asked: "By the way, what is that math job you talked about yesterday?"

Xu Xiao celebrated his birthday yesterday. He didn't ask for money, but he asked him to help make a mathematical model.

Just because there was a dinner party to celebrate in the evening, he didn't have time to ask. He would have time on the high-speed rail so he could take a look.

Hearing Xu Chuan's inquiry, Xu Xiao quickly opened his computer.

"I sent it to your email, brother, please take a look first."

Xu Chuan nodded, took the notebook from the small table beside him, slid his fingers twice on the touch pad, and clicked on the mailbox.

In the mailbox that he paid special attention to, a new email arrived. He clicked on the email and looked along the title of the email. However, when the title came into view, he was slightly stunned.

[Research theory of simulated neural signals and electrical signal conversion based on quantum theory]