Xueba's Sea of ​​Stars

Chapter 210 Elastic Constants of Two-Dimensional Materials

There are currently two most widely used methods in computational materials science.

One is to combine experimental data, establish a mathematical model and then simulate and reproduce the actual process through numerical calculation, and then repeatedly correct the previous mathematical model to achieve a certain physical explanation, focusing on experimental research and applicability.

The second is computational simulation, which refers to predicting, designing or modifying the structure and performance of materials directly through theoretical models and numerical calculations for specific materials, specific physical mechanisms or reaction mechanisms, focusing on theoretical research and predictability.

When Wu Bin was reading literature before, he read an article on calculating the elastic constant of two-dimensional materials, which said to use the energy-volume curve to fit.

Their laboratory can calculate the elastic constant of two-dimensional materials with IBRION=6 and ISIF=3, but after reading this, Wu Bin found that the elastic constant units of graphene are too many. Some literatures assume that the effective thickness of graphene is 0.34 nanometers, Young's modulus is about 1TPa.

But there are also second-order reciprocals like 60eV, and 345N/m, 350GPa*nm, and so on.

Therefore, calculating the elastic constant of two-dimensional materials has become a new topic for Wu Bin, although on the surface, this research cannot help him solve the problem of mass production of graphene.

But he firmly believes that as long as he understands a little more about two-dimensional materials, there will eventually be a bright spot that can become the basis of his theory.

In addition, Lin Ziqi has also gained a lot this month. I don't know if it is because the theoretical foundation has reached saturation, or because of Wu Bin's long-term influence, her experimental ability has suddenly improved through a breakthrough.

For example, the night before yesterday, she excitedly called Wu Bin to the laboratory, and turned a picture into a sound signal on the spot, and then added an oscilloscope to display the picture on the oscilloscope.

After watching it, Wu Bin nodded affirmatively, and commented, "If you put it back 80 years ago, you would definitely be a TV maker."

What he said was not an encouraging compliment, but he really felt that Lin Ziqi was able to use the simplest old-fashioned electronic oscilloscope equipment to demonstrate the principle of TV, which can be said to be quite powerful.

Lin Ziqi, who was praised, also seemed very happy,
The next day Feng Jinhui heard about it and said: "The laboratory has always been a place where you can find out what people are suitable for. With Xiaolin's hands-on ability, it's a pity not to study engineering. Of course, it's okay to do theory."

This incident can be said to have greatly stimulated Lin Ziqi's enthusiasm for scientific research, and the time to go to the library in the morning was much earlier.

Because the total funding for Professor Liu's project is quite abundant, Wu Bin only needs to apply to Feng Jinhui for some small research funding when he studies graphene. The highlight is that he is rich and powerful!
Of course, this is all in exchange for Professor Liu's accumulation of reputation over the years. As for what is reputation?That is to give money, you can give something, this is reputation!
We must know that there is no shortage of experimenters all over the world who run away for funds. They don’t do many experiments throughout the year, and they have to talk to various investors. It can be said that it is really difficult for a man of science to do this. up.

Moreover, Professor Liu also told him that starting next semester, if he joins a tutor's project, he can get paid, and it's not the kind of dead salary, it will be determined according to the workload.

At present, 15% of the application project funds of major universities are usually used as labor fees for graduate students. For example, if your component reaches 80 yuan in total funding, 12 yuan is the labor fees for graduate students. Of course, this money will be used in the end. How to allocate, or the boss has the final say.

If you were an ordinary undergraduate student, you would basically be treated as a handyman, and your salary would be paid on a monthly basis. As for the amount... I am embarrassed to say, at most it is a meal allowance.

However, Wu Bin is a bit special. His knowledge range is so wide that one person can be an army, and he is very enthusiastic about scientific research. For some experiments that do not need to collect a large amount of data, he really does not need any helpers, and he can do it by himself.

Wu Bin, who was involved in the new experiment, immediately entered the mode of not focusing on anything else, his mind was full of experimental data, and he was so hungry that he couldn't concentrate until ten o'clock in the evening, so he rubbed his eyes and went to soak a bowl of fresh shrimp and fish noodles.

While eating noodles, Wu Bin glanced at his phone and found that Pei Jiamin had sent him a message at noon on WeChat.

[Congratulations, why don't you mention such a big event as "Science" in the classmate group, isn't it too strange? 】

After reading this, Wu Bin took a sip of instant noodles and replied.

【low profile. 】

Just as I was about to put down my phone after posting, I found that Pei Jiamin replied in seconds.

【You are too low-key! 】

[Do you know that I only found out through my dad how you feel about posting "Science"...]

Bad guy: [Um...what mood? 】

Pei Mimi: […]

[Cheers to our fake friendship. 】

Bad guy: […]

【Not so...】

Pei Mimi: [Shouldn't things worth celebrating be shared with friends? 】

Bad guy: [Okay, my fault, I will let you know next time. 】

Pei Mimi: [Schoolmaster is Xueba, so is it scheduled to release "Science" next time? 】

Seemingly satisfied with Wu Bin's attitude of admitting his mistakes, Pei Jiamin stopped pursuing the matter and started joking.

Unscrupulous person: [It is also possible to publish "nature"~]

Pei Mimi: [It's amazing, to be honest... Actually, "Science" was told to me by my dad, and I searched to find out what level of journal it is. Do you think you are going to become a great scientist in the future? 】

Bad guy: [Who knows what will happen in the future, but I should continue on the road of scientific research. 】

Pei Mimi: [Well, I should also go on the road of medicine. 】

Bad guy: [Come on, I believe that one day I will see your article on "Cell". 】

Pei Mimi: [Don't dare to think, don't dare to think. 】

[Then I'll sleep first, don't try too hard. 】

Bad guy: [Okay, good night. 】

Putting down his cell phone, Wu Bin began to eat noodles to accumulate energy for the whole night.

……

On Monday, Wu Bin went back to his dormitory to take a shower. As soon as he approached the door, he heard a sound similar to that of a guitar, but somewhat different.

Pushing open the door, Wu Bin glanced at the dormitory, and immediately found the source of the sound, Li Yan who was holding a small guitar.

"Huh!? When did you know how to play the guitar?" Wu Bin asked in surprise.

"I just learned it." Li Yan played a note, "Besides, please don't be such a layman, this is called a ukulele, not a guitar."

"Ukulele...? No wonder the sound is different." Wu Bin said while searching for a change of underwear.

"Yes, although they look very similar, they are actually two musical instruments with completely different styles. Let me play you a piece of "Castle in the Sky" that I just learned. Listen."

PS: Thank you for your support~
(End of this chapter)