Chapter 304 Teacher Qiu, close the door
After Xu Qingshan finished speaking, he ignored Qiu Yong and sat on the sofa, with the blanket half hanging on his legs and writing on the paper with a pen. Drawing, and from time to time I pick up the computer on the table to check information.
Qiu Yong sat for a while again.
Jiang Huanxi was busy with his number theory work nearby, and Tong Tong was also in the room reading the questions, and he was still sitting there.
After sitting for a long time with no one paying attention, Qiu Yong felt that he was asking for trouble, so he asked Xu Qingshan symbolically.
"Then if nothing happens without me, how about I go back first?"
Xu Qingshan stopped moving, moved his eyes from the computer to Qiu Yong's face, pondered for a moment, and nodded.
Qiu Yong sighed and stood up to leave, but his movements were a little slower. He seemed to be waiting for Xu Qingshan to persuade him to stay and do something together. After all, he still had many things he wanted to give Xu Qingshan and see. Why hasn't all the ink in the literature been used?
“Hey, Lao Qiu.”
Just as Qiu Yong walked to the entrance of the suite, Xu Qingshan’s voice came from behind.
"Hey! What? What do you need me to tell you about?"
Qiu Yong's face lit up and he asked aloud.
He felt that at this moment, the gears of fate began to turn, and he and Xu Qingshan were about to have a master-disciple relationship. In the end, he was moved by him emotionally and rationally, and was grateful for his profound knowledge, He had a kind-hearted personality and a calm manner in dealing with people. Finally, he turned from darkness to light and switched from Peking University to Huaqing University.
Ah!
What a wonderful academic legend!
Qiu Yong's face was rippling, and he saw Xu Qingshan's confused eyes.
Xu Qingshan pointed at the door and said.
“There’s no other problem, just remember to close the door when you go out.”
“Huh?”
“It’s okay if you don’t close it, I’ll close it later. ”
Xu Qingshan thought Qiu Yong was reluctant, so he was stunned for a moment, a little annoyed. When he concentrated, he forgot to respect his teacher. How could he use Teacher Qiu like this?
"It's okay, it's okay, I'll shut you down."
Qiu Yong burst into tears, closed the door with hatred, and walked faster than a rabbit.
In fact, if Xu Qingshan really wants to develop scientific calculation software for organic polymer materials, he must first have a sufficient understanding of organic polymer materials.
Fortunately, he had already laid some foundations at Beijing University. In addition, Xu Qingshan always felt that his brain was getting better and better the more he used it. It didn’t take much time, so he sorted out his learning ideas. .
There are just a few important issues that need to be mastered in depth so that he can have a clearer understanding of the entire computing system and simulation process when designing original algorithms.
"Quantum nuclear tunneling model of charge transport in organic and carbon materials, conduction mechanism; multi-mode coupling rate problem of organic molecular aggregates and polymer electronic excited states"
Xu Qingshanzui He was mumbling something that neither Jiang Huanxi nor Tong Tong could hear clearly.
It’s just that they both have their own things to be busy with.
The room was very quiet.
There are only slight sounds of breathing, the sound of fingertips scratching on the paper, and the intermittent sound of the keyboard.
Normally speaking, if a newcomer comes into contact with materials computing, the most suitable learning plan should be to first become familiar with the Linux operating system and MATLAB programming, so that he can almost write some relatively mature small programs. , it can be considered as having some programming foundation.
Afterwards, you should find some relevant doctoral theses or master's theses to study and learn about various aspects of materials computing.
After you have a general understanding of the various subdivisions and classifications of materials computing, you can start to learn the related theories of molecular dynamics. This is also an extension of computational physics. Many people should have some knowledge during the professional course stage. touch.
Then you will learn to compile LAMMPS software, which is a molecular dynamics simulation software developed in 2003. It mainly relies on its rich built-in potential energy models to simulate different material states and interaction forces.
Using LAMMPS, learning how to write in files and understanding result analysis methods can be regarded as the most classic and popular way for newcomers to build up their knowledge and complete system understanding of computational materials science work.
At this point, you can imitate other people's papers and reproduce other people's work.
As long as the reproduction is successful, it means that you have successfully mastered the basic operations and ideas of materials computing.
Xu Qingshan understands Linux and is also good at using MATLAB. He also has a certain knowledge reserve about molecular dynamics and related knowledge.
But he repeated it again according to this normal process.
He even took out his matlab beginner's books and read them again.
Because he not only needs to do these things himself, he also considers organizing a more complete and suitable study plan that reduces detours for the graduate students in his hands to learn and master.
Whether it is materials computing or work related to mathematical physics.
When Xu Qingshan leaves the field of pure mathematics and begins to move into the field of applied practice, it is unlikely that he will only have a three-legged cat like Xiao Xue Xiaowang in his hands.
As Qiu Yong said, a sufficient team is needed.
“Enough” in this context is difficult to define.
But whether it is in terms of scale, resources, or other aspects, Xu Qingshan needs to use his influence to make up for it.
Maybe someone will ask.
What Xu Qingshan wants to do has nothing to do with molecular dynamics, right?
Especially since he now wants to develop scientific computing software by himself, is it appropriate to get involved with something that is not so relevant?
Quite appropriate.
Because judging from the current computing power level of personal PCs, being able to play LAMMPS is already the limit. As for the software Xu Qingshan wants to make, the pre-data and preparations he wants to obtain, Judging from the current computing power of personal PCs, let alone the laptop in Xu Qingshan's hand, even if he has a desktop, it is not enough.
Many calculations involving first principles and finite element analysis require the use of supercomputing.
Or at the very least, he needs a workstation in his laboratory.
But now he only has a dedicated office, not a dedicated laboratory.
He had to wait until he returned to the capital after the New Year and then go to the Information Technology Center to ask Lao Mei and the others to help arrange supercomputing qualifications, then apply for laboratory qualifications, and then purchase workstations that would be suitable for related work.
Supercomputing in China is still relatively rare now.
Xu Qingshan has paid attention to the fact that last year, my country's "Tianhe-1" petaflop supercomputer was successfully developed, making our country the second country in the world to successfully develop a petaflop supercomputer.
Moving forward, and then in 2011, China's supercomputing will also have greater breakthroughs, aiming to be the first in the world.
This simply provides a transcendent hotbed for the development of computer science.
certainly.
The biggest reason why Xu Qingshan now chooses LAMMPS software to use on his laptop is that
it is free.
After Sandia National Laboratory in the United States developed LAMMPS, it opened the source code and made it available for free. This allowed Xu Qingshan to analyze the source code of LAMMPS to quickly understand the functionality of this type of scientific computing software. Development key.
First, modify the source code and study its parallel expansion function, while conceiving how to design the algorithm for your own software.
Xu Qingshan was looking at the software on the computer and thinking about it. His pen, which had been writing smoothly, stopped moving, but his head moved very fast.
He seemed to have entered a state of almost trance again.
Although Jiang Huanxi and Tong Tong are also studying seriously, it is obvious that they have not reached the level of immersive learning that Xu Qingshan did.
After they completed their study and research tasks today, they wanted to come to Xu Qingshan, but saw his mysterious and mysterious state.
Tong Tong is still watching, but Jiang Huanxi is used to it.
"Let's go eat first and bring him the food later."
Jiang Huanxi patted the arm of Tong Tong, who was standing next to Xu Qingshan and was observing carefully but not daring to disturb him.
"Should we wait for brother to get better before we go to dinner together?"
Tong Tong looked at Xu Qingshan with some worry, then looked at Jiang Huanxi, and asked with dissatisfaction.
“If Qingshan usually enters this state, he will not be able to come back to his senses until night. If it is too late and there is no food nearby, he will be in trouble when he is hungry after he comes to his senses.”< br>
Jiang Huanxi was not dissatisfied with Tong Tong's attitude, but explained patiently. "Let's go eat something simple first to fill our stomachs, so that we can help him deal with all these problems. This hotel is quite interesting. There is a microwave in the executive suite. We bought some and they tasted good after reheating. Just bring back the things."
Tong Tong pouted, looked at Xu Qingshan reluctantly, and nodded in agreement.
Although I don’t want to admit it.
But Jiang Huanxi does seem to be more mature than herself. Even though she has actually taken care of her grandmother and younger brother since she was a child, and often works part-time, Jiang Huanxi's gentle and calm temperament does not seem to match her.
Could it be that this style is what my brother likes?
Tong Tong is puzzled.
Jiang Huanxi breathed a sigh of relief.
She was worried that Tong Tong would not understand at this time and insisted on waiting here, thus accidentally disturbing Xu Qingshan and affecting his work.
At the same time, Jiang Huanxi's face was calm, but he still felt a little proud in his heart.
The days when he and Qingshan live together are his greatest advantages.
No matter what Tong Tong thinks.
Judging from the current situation, I can control Qingshan, and Qingshan still favors me, and my work and life in Qingshan are more important than Tong Tong.
That's enough.
The two girls went out together with ulterior motives.
Xu Qingshan stayed in the room like a silent tree root. If his hands hadn't moved from time to time, and his eyes would wander between the manuscript and the notebook, it would be hard to believe that he was still alive.
After a long time.
“It seems that the seventeenth idea is feasible.”
Xu Qingshan turned back a few pages and muttered.
As his talking to himself broke the calm, he slowly pulled out of that immersive state.
"Gulu."
At the same time, Xu Qingshan's stomach also made a rumbling sound.
He glanced down and determined that he must be hungry.
"Xiaoxi, kid, are you going to eat?"
Xu Qingshan glanced at the living room, no one was there, and looked at the time. It was after eight o'clock in the evening. He was probably tired from studying. Going to rest in the bedroom? Or went to take a shower?
He didn't know, he hadn't paid attention to the outside world just now, so he shouted loudly towards the bedroom.
But it was quiet for a long time.
No one responded to him.
The entire executive suite is not small, and his voice echoed for a short time.
"Huh? Where are the people?"
Xu Qingshan put the manuscript aside and stood up. His legs felt a little stiff and sore for a while. If a person stays in the same posture for a long time, he will feel uncomfortable.
Of course, except sleeping while lying down.
After walking around the room twice, Xu Qingshan confirmed that Jiang Huanxi and Tong Tong had gone out on their own.
"You should have gone to eat, right?"
Xu Qingshan thought for a while, sat back on the sofa, made himself a cup of tea, and drank some tea to relax.
He knew very well that if Jiang Huanxi went out to eat, he would definitely not forget to bring something for him, so he wouldn't have to worry about too many other things.
Xu Qingshan crossed his legs, picked up his mobile phone and read an interesting novel that he was chasing recently, wrapped the ears of the tea cup with tissue paper, and brought the scalding hot tea to his mouth.
The people of Fujian and Yue are like this.
The reason for being hot is to avoid being burned, but if the tea you drink in your mouth is not hot, then the tea will have to be poured out and brewed again.
When drinking tea, drink it hot!
"But"
Xu Qingshan sipped his tea while reading the novel.
But he forgot.
Drinking tea on an empty stomach will make you more hungry and hurt your stomach.
No.
Before he had a few drinks, his stomach started to grow louder and it didn't stop.
The hot tea he drank in his stomach not only failed to warm his stomach, but also caused some signs of stomach cramps.
Just when Xu Qingshan was thinking about whether there was anything in the room that could satisfy his hunger, the door of the executive suite was opened. At that moment, Xu Qingshan saw Jiang Huanxi and Tong Tong carrying bags in their hands. , it was like seeing the doomsday savior.
"What did you guys buy? I'm so hungry that my stomach hurts."
Xu Qingshan quickly stood up and went over to take the bag.
Tong Tong approached Xu Qingshan with a concerned look on his face, stretched out his hand to touch his belly, and asked with tears almost coming out.
"Brother, what's the matter with your stomachache? Should we go to the hospital first?"
"It's okay. He should have drank tea. He was already empty stomach and became even hungrier after drinking it. "
Jiang Huanxi changed his shoes, and after the old man handed the bag to Xu Qingshan on the ground, he began to take off his heavy coat.
“I bought your favorite wontons. I have tried them. The taste of the wontons here is quite close to the flat food in our hometown. The white teal duck here is said to be from Jinling. Specialty, eat it cold, you can try it.”
As Jiang Huanxi said, Tong Tong had already opened the contents of the bag for Xu Qingshan.
"Yeah. It's really good."
Xu Qingshan stuffed it into his mouth, eating a little anxiously, and he had to open his mouth to breathe from time to time.
"Brother, eat slowly, be careful not to choke."
Jiang Huanxi had already changed his shoes, sat next to Xu Qingshan, pinched a piece of white teal meat with his hands, and put it in his mouth He handed it over, ate one piece, and then picked up the duck leg and took a small bite.
Tong Tong looked at it for a moment, weren't they all full just now?
"How about the wontons?"
"Yeah!"
"Then try my duck meat. I've tried it and it's salty."
Tong Tong just watched as Jiang Huanxi took a bite of her and stuffed it into Xu Qingshan's mouth.
you!
On a cold day, the wind outside did not blow Tong Tong away. Instead, the moment he came into the room, he was blown away by the wind.
Jiang Huanxi is indeed Jiang Huanxi, his biggest opponent on the road to his dream.
Looking at her relaxed and natural feeling, there is nothing stiff about her.
Tong Tong only hesitated for a moment and sat on the other side of Xu Qingshan.
(End of this chapter)