The Science Fiction World of Xueba

In the next two months, in addition to teaching at Peking University School of Mathematics, Pang Xuelin also went to Wang Miao's Nano Center from time to time to learn about the manufacturing process and process of the "Flying Blade" material.

Of course, he can only take a quick look at the flowers and see the general situation.

However, according to the technological process and technical information given by the system, Pang Xuelin finally understood the principle of the "flying blade" material and the entire manufacturing process.

Unlike traditional carbon fiber materials, the flying blade material is made of carbon nanotubes.

Carbon nanotubes are considered to be one of the strongest materials found so far, with Young's modulus as high as 1TPa and tensile strength as high as 100GPa (specific strength as high as 62.5GPa/(g/cm3)), exceeding T1000 carbon fiber More than 10 times stronger.

It should be known that the specific strength of known macroscopic materials is far lower than 7.5GPa/(g/cm3), such as 0.05~0.33GPa/(g/cm3) for steel wire rope, and 0.5~3.5GPa/(g/cm3) for carbon fiber. ), the polymer fiber is 0.28~4.14GPa/(g/cm3), from this we can imagine how terrifying the strength of carbon nanotubes is.

However, when a single carbon nanotube material with excellent mechanical properties is prepared into a macroscopic material, its performance is often far lower than the theoretical value.

The main reason is that the average length of the carbon nanotubes forming the fiber is relatively short, and the units are overlapped by van der Waals force, which is very easy to slip each other under the action of tension, and the intrinsic high strength of the carbon nanotubes cannot be fully utilized.

In addition, structural defects and disordered orientations in carbon nanotubes will lead to a decrease in fiber strength.

Wang Miao used the preparation method of reaction black box to controllably prepare meter-scale continuous ultra-long carbon nanotube bundles with definite composition, perfect structure and parallel arrangement. Such bundles have consistent orientation and mechanical properties close to the theoretical limit.

It is not only the best material for making space elevators, but also has bright application prospects in large aircraft, heavy launch vehicles, space stations, spacecraft, super buildings and other fields.

The only regret is that even if this material is prepared in a black box, the annual output is extremely limited.

According to Wang Miao's estimation, the preparation cost of this material is almost equivalent to the same weight of gold.

Pang Xuelin couldn't help but secretly startled.

But he doesn't care, anyway, when he returns to the real world, let his father worry about the cost of flying blade materials.

In the past two months, apart from obtaining the flying blade material, Pang Xuelin also held a BSD conjecture report meeting at Peking University School of Mathematics. The participants were all the top mathematicians in the world.

Of course, Pang Xuelin didn't know any of them.

Therefore, Pang Xuelin was not at all afraid at the report meeting, and he regarded it as a rehearsal for the report meeting after returning to the real world.

The results of the report meeting were relatively satisfactory. Except for some minor flaws in the speech, Pang Xuelin answered the tricky questions from various angles raised by the participating mathematicians one by one. The proof of the BSD conjecture was officially recognized by the international mathematics community.

The good thing after this report is that Pang Xuelin's status in Peking University's School of Mathematics has been further improved. Several bigwigs from the School of Mathematics even talked to him specifically, and they are going to be elected as a candidate for the Chinese Academy of Sciences by the Chinese Mathematical Society this year.

Pang Xuelin doesn't care about this, anyway, he has to go back after staying in the Three-Body World for a year or two, it doesn't matter if he has these titles or not.

In the past two months, Pang Xuelin's friendship with Wang Miao and Ding Yi has been further improved. He even went to Wang Miao's house for dinner a few times, and gradually became familiar with Wang Miao's wife and children.

However, Pang Xuelin did not take the initiative to contact those important characters who will appear in the second and third parts of the novel, such as Luo Ji. Although he is next door to Peking University, if Pang Xuelin took the initiative to look for him, he would definitely be able to find him, but Pang Xuelin did not meet him. idea.

On the one hand, when Luo Ji went to worship Yang Dong (Ye Wenjie's daughter) this summer, he met Ye Wenjie in front of the tombstone.

Ye Wenjie told him two basic axioms of cosmology:

Survival is the first need of civilization.

Civilizations continue to grow and expand, yet the total amount of matter in the universe remains constant.

In addition, the two concepts of chain of suspicion and technological explosion were given, which laid the foundation for Luo Ji's later discovery of the law of the dark forest in the universe.

Pang Xuelin was sure that Luo Ji's every move was under Sophon's surveillance.

Moreover, he made a list of both the Three-Body Civilization and ETO, and he couldn't guarantee whether the Three-Body Humans were monitoring him. Therefore, going to Luo Ji at this time was purely courting death.

But what Pang Xuelin didn't expect was that he didn't take the initiative to find the plot characters, but some plot characters appeared in front of him.

This afternoon, Pang Xuelin had just finished a lecture on abstract algebra for undergraduates when his cell phone rang.

From Pang Xuelin's point of view, it was Wang Miao who called.

He quickly pressed the answer button, and Wang Miao's hearty laughter came from the other end of the phone: "Xiao Pang, come to dinner at home tonight, and your sister has cooked some special dishes. Da Shi will come over then!"

"Okay, Brother Wang."

Pang Xuelin readily agreed.

Gathering with Wang Miao, Da Shi, Ding Yi and the others from time to time has almost become a regular subject for him after returning to China.

Among the four of them, Da Shi's wife died young, and Ding Yi had been a loner after Yang Dong's death. Not to mention Pang Xuelin, only Wang Miao had a family and a family, and lived a good life.

Therefore, they would go to Wang Miao's house for dinner from time to time. Wang Miao's wife, Li Yao, knew that Pang Xuelin was an orphan and had no relatives, so she made a special appointment with him as a sibling.

During several dinner parties, Li Yao urged Pang Xuelin to quickly find a girlfriend and introduce someone to Pang Xuelin.

Pang Xuelin naturally declined, he would not stay in this world for long, and finding a girlfriend would only delay the other party.

In the evening, Pang Xuelin drove downstairs to Wang Miao's house, picked up a small toy bought for Wang Miao's son from the passenger seat, entered the unit building, and knocked on Wang Miao's door.

After a while, the door opened.

To Pang Xuelin's surprise, it was not Wang Miao's wife Li Yao, nor Wang Miao or their son Wang Xiyu who opened the door, but an extremely beautiful girl Pang Xuelin had never seen before.

It's not that Pang Xuelin has never seen beautiful women, but the girl in front of him, among all the women he has seen, has at least the top three appearance and temperament.

He was even slightly higher than the Jiang University counselor Qi Xin he met before he entered the Three-Body World.

The girl is wearing a white dress with a quiet and elegant demeanor. When she smiles on her face, it seems that the whole world has become sunny.

"Hello, this is Wang...Professor Wang's house, right?"

Pang Xuelin suspected that he had gone to the wrong room.

The girl nodded and said, "You are Professor Pang, come in quickly!"

Pang Xuelin followed into the house, and Li Yao's voice came from the kitchen: "Little brother, you are here."

Immediately afterwards, Li Yao came out of the kitchen with a plate of dishes, and said with a smile: "Little brother, let me introduce you, this is the daughter of one of my colleagues, Zhuang Yan, who studies Chinese painting at the Central Academy of Fine Arts, Xiao Zhuang, This is the Dr. Pang Xuelin I told you about, the genius mathematician who solved the BSD conjecture!"

Pang Xuelin felt his brain buzzing, Zhuang...Zhuang Yan? Central Academy of Fine Arts student?

The name is right, the school is right, and even the appearance is right!

No way, sister Li Yao, are you sure you want to introduce to me the heroine of "Dark Forest" and Miss Zhuang Yan who is in charge of the beauty in the trilogy? !