From failed candidate to chief scientist

Chapter 218 Do you call this a small study?
Seeing that Chen Jiachuan had obtained the research topic, Zeng Guangping and He Yinhua also looked forward to it with eager eyes.

"Teacher Ho."

Lin Mo looked at He Yinhua.

"Mr. He, you are engaged in mathematical modeling. I have a topic about modeling here."

Lin Mo handed a project establishment report to He Yinhua.

"Multi-scale modeling and calculation of water molecules?"

Water molecules seem simple, but it is not easy to build a high-quality, low-computation model.At the typical scale of water molecules (0.3 nanometers), quantum effects cannot be ignored.Therefore, first principles calculations based on quantum mechanics are necessary for the simulation of water molecules.

However, the quantum model requires too much calculation, and the number of water molecules in the currently reported simulation systems does not exceed 100.Because the system is too small, meaningful statistics are often not obtained.In the real world, the number of molecules in 1 gram of water is on the order of 10 to the 22nd power. Of course, the number of molecules in the simulation should be closer to this level, the better.

The most commonly used calculation model for water molecules is the classical atomic model.In a typical atomic model, hydrogen atoms are positively charged, oxygen atoms are negatively charged, and the electrostatic interactions between atoms simulate hydrogen bonds.

The atomic model is characterized by simple calculations. Quantum interactions are equivalently expressed by classical interactions between atoms. Calculating the interaction between two water molecules only requires 10 calculations of the interaction between atoms.

And because the three-body interaction is not considered, such a model can be calculated efficiently in simulations, and the current simulation scale can reach 10 to the 5th power of molecules.This is the upper limit of what can be achieved using atomic model calculations.

But this is far from enough. It is still far from 10 to the 22nd power.

Therefore, the modeling of multi-scale water molecules has become the latest research direction.

The reason why Lin Mo chose this topic was to prepare for the future. Water molecules are one of the most basic molecules. Studying water molecules can lay a good foundation for the future. Only by understanding the study of water molecules can we get closer. Studying other molecules in one step is the most important step for future research on quantum theory or extending exploration into materials science.

From this research topic alone, we can see that the planning Lin Mo mentioned is not just drawing pictures and shouting slogans, but actually working hard in this direction.

The moment He Yinhua saw this topic, he already thought about a lot of things.

But, do you really have to leave this question to yourself?

He Yinhua felt a lot of pressure and he had no confidence at all.

He suddenly understood why Chen Jiachuan had such an expression when he got the question just now.

If Chen Jiachuan just has no direction when facing the largest Abelian expansion, then He Yinhua feels confused now.

Yes, he was confused. When he faced the topic given by Lin Mo, he felt very confused. What confused him was not that he couldn't understand the topic, but that he was confused about whether he could really produce results by studying such a topic.

This question seems simple and can be understood by elementary school students, but it is world-class in difficulty when done.

There is usually an unwritten rule in mathematics.

That is, the simpler the question, the more difficult it is.

Just like the previous Kratz conjecture, just like the Goldbach conjecture known as the "1+1" problem.

Modeling water molecules is not an easy task, to be precise, it is very difficult.First of all, how to determine the parameters in the model is a very particular issue, such as the charge amount of hydrogen and oxygen atoms, Lennard-Jones potential energy parameters, hydrogen-oxygen bond length, bond angle, etc. Currently, many models are based on setting parameters. It is based on the test results of certain physical quantities, such as density-temperature curve, radial distribution function, heat of vaporization, etc.

The problem here is that although the simulation results are relatively accurate for those physical quantities referenced in the modeling, the accuracy of other physical quantities cannot be guaranteed, and even completely wrong results are given.

At present, the academic community has given 46 atomic models of water, but none of them can correctly give all the physical properties of water at the same time.

Let me solve a problem that so many scholars around the world have failed to solve?
Do you think too highly of me?

He Yinhua opened his mouth. He wanted to ask if there was any research plan like Chen Jiachuan, but thinking of what Lin Mo just said to Chen Jiachuan, He Yinhua swallowed the words on his lips.

He knew that if he opened his mouth now, Lin Mo would definitely not give him any research plan, and he would be looked down upon by Lin Mo. He had just arrived, had not yet made any achievements, and urgently needed to prove himself.

"How is it? Teacher He, is this subject okay?"

Seeing that He Yinhua was silent, Lin Mo couldn't help asking.

He Yinhua knew that he could no longer hesitate, so he could only say through gritted teeth.

"Okay, I'll take this project! I'll work hard to produce results!"

At this time, expressing one's position comes first. As for how to solve the problem, let's wait until later.

Seeing that He Yinhua agreed, Lin Mo nodded in satisfaction.

Then, Lin Mo's eyes turned to the person he thought was Teacher Zeng Guangping.

He had just read the projects of He Yinhua and Chen Jiachuan, and it was frightening to see them.

What kind of devilish subject are these?
Is this really what we should be studying now?
We just joined, why don't we find two simple topics first, and make a foundation first?
It is so difficult for us to come up this time. Could it be that this is to give us a blow?
If Lin Mo knew what Zeng Guangping was thinking at this time, he would definitely tell him that he was overthinking.

In Lin Mo's eyes, these are small studies, just for them to practice.

As for making a show of force or something?Lin Mo didn't think about it at all. At the dinner party before, Lin Mo said that since he joined the Mathematics Research Center, everyone will be treated equally and work hard for one goal. There are not so many vain and tricky things.

"Teacher Zeng, what I just gave to Teacher Chen and Teacher He is a small research. On your side, Academician Fu has been praising you, so I have a slightly difficult topic for you..."

Lin Mo looked at Zeng Guangping with a somewhat embarrassed look.

Zeng Guangping's heart skipped a beat.

a bit difficult?Is that even more difficult than what was given to Chen Jiachuan and He Yinhua just now?
Zeng Guangping had a bad feeling in his heart.

When Chen Jiachuan and He Yinhua heard Lin Mo's words, they roared in their hearts. Do you call this a small study? !
Lin Mo didn't pay attention to the expressions of the three people and handed over the last project proposal in his hand.

Zeng Guangping reached out to take it with trembling fingers. Chen Jiachuan and He Yinhua also moved their heads curiously. They also wanted to know what kind of subject would be more difficult than their own.

All three heads leaned in front of the paper and looked at the content on the paper. Then, the three of them widened their eyes at the same time, and their eyes were full of shock!
(End of this chapter)