MTL - The Science Fiction World of Xueba-Chapter 15 Hello, Zhuang Yan

In the next two months, in addition to teaching at Beijing University of Mathematics, Pang Xuelin went to Wang Miao's Nano Center from time to time to learn about the manufacturing process and process of "flying blade" materials.

Of course, he can only take a look at the flowers and take a look.

However, compared with the process flow 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, flying blade materials are made of carbon nanotubes.

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

It must be known that the specific strength of macro materials is far below 7.5GPa / (g / cm3). For example, the rope is 0.05 ~ 0.33GPa / (g / cm3), and the carbon fiber is 0.5 ~ 3.5GPa / (g / cm3). ), The polymer fiber is 0.28 ~ 4.14GPa / (g / cm3), so you can imagine how terrible 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 much lower than the theoretical value.

The main reason is that the carbon nanotubes that form the fibers are short in length, and the unit bodies are overlapped with each other by Van der Waals force. Under the action of tensile force, they can easily slip to each other, and the inherent high strength of carbon nanotubes cannot be fully utilized.

In addition, structural defects and random orientations in carbon nanotubes can cause fiber strength to decrease.

Wang Miao adopts the preparation method of reaction black box to controllably prepare a meter-level continuous ultra-long carbon nanotube tube bundle with a defined composition, a perfect structure and a parallel arrangement. This tube bundle has a uniform orientation and mechanical properties close to the theoretical limit.

It is not only the best material for manufacturing 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 the material is prepared in a black box, the annual output is very limited.

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

Xi Pang Xuelin could not help secretly whispering.

But he doesn't matter, anyway, when returning to the real world, the cost of flying blade materials is left to his dad to have a headache.

In the past two months, in addition to getting the flying blade materials, Pang Xuelin also held a BSD conjecture report at Beijing University of Mathematics. All the world's top mathematicians attended the conference.

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

Therefore, Pang Xuelin did not hesitate at the report meeting. He should be a preview of the report meeting after returning to the real world.

The results of the lecture were quite satisfactory. In addition to some small flaws in the lecture, Pang Xuelin answered the tricky questions from various angles presented by the participating mathematicians. The proof of the BSD conjecture was officially recognized by the international mathematical community.

的 The benefit of this conference is that Pang Xuelin's status in the Beijing University of Mathematics has been further enhanced. Several big brothers of the Mathematics Institute also specifically talked to him, preparing to be elected as the candidate of the Chinese Academy of Sciences this year.

Xun Pang Xuelin didn't care about that, anyway, he had to go back in the three-body world for a year or two. These titles are the same as none.

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

However, Pang Xuelin did not take the initiative to contact those important characters that 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 would find it, he would be able to find each other, but Pang Xuelin did not meet him idea.

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

Ye Wenjie told him two basic axioms of cosmic sociology:

Survival is the first need of civilization.

The puppet civilization continued to grow and expand, but the total amount of material in the universe remained unchanged.

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

Xi Pang Xuelin is sure that every act of Luo Ji is under the supervision of Tomoko.

And he put together a three-body civilization and an ETO. He couldn't guarantee that the three-body person was monitoring himself. Therefore, at this time, he went to Luo Ji to find death.

But what Pang Xuelin didn't expect is that he did not take the initiative to find the plot characters, but there were plot characters who appeared in front of him.

下午 This afternoon, Pang Xuelin just finished an abstract algebra for undergraduates, and the ringtone of the mobile phone rang.

At first glance, Pang Xuelin showed that it was Wang Miao.

He quickly pressed to answer, and a loud laugh came from the other side of the phone: "Xiao Pang, come home for dinner at night, your sister made a few good dishes. Da Shi will come over!"

"Okay, Wang."

Xi Pang Xuelin readily agreed.

He met with Wang Miao, Da Shi, and Ding Yi from time to time, and almost became a fixed subject after he returned to China.

四 Among them, Da Shi ’s wife died early, and Ding Yi has always been lonely after Yang Dong ’s death. Not to mention Pang Xuelin, Wang Miao has a family and a good life.

Therefore, from time to time, they went to Wang Miao's house to eat rice. Wang Miao's wife, Li Yao, recognized Pang Xuelin as an orphan and had no relatives, so he specifically recognized his sister.

On several occasions, Li Yao urged Pang Xuelin to find his girlfriend and introduce him to Pang Xuelin.

Pang Xuelin naturally declined. He didn't stay long in this world. Finding a girlfriend would only delay the other party ~ www.novelbuddy.com ~ In the evening, Pang Xuelin drove downstairs to Wang Miao's house and picked up one from the front passenger seat. A small toy bought for Wang Miao's son entered the unit building and knocked on Wang Miao's door.

After a while, the door opened.

I was surprised by Pang Xuelin. It wasn't Wang Miao's wife Li Yao that opened the door, not Wang Miao or their son Wang Yiyu, but an extremely beautiful girl Pang Xuelin had never seen.

She Pang Xuelin hasn't seen a beauty, but the girl in front of her has at least the top three among all the women he has seen.

He was even slightly better than Qi Xin, the Jiang Da counselor he met before entering the three-body world.

The girl was wearing a white dress with a calm and elegant temperament. When a smile appeared on her face, it seemed that the whole world had become sunny.

"Hello, this is Wang ... Professor Wang?"

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

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

Xi Pang Xuelin followed into the room, and Li Yao's voice came from the kitchen: "Brother, you are here."

Immediately afterwards, Li Yao came out of the kitchen with a dish and laughed: "Brother, let me introduce you. This is the daughter of a colleague, Zhuang Yan, studying Chinese painting at the Central Academy of Fine Arts, Xiaozhuang, This is Dr. Pang Xuelin I told you, the genius mathematician who solved the BSD conjecture! "

Wu Pang Xuelin only felt his head buzzing, Zhuang ... Zhuang Yan? Student at Central Academy of Fine Arts?

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

No, sister Li Yao, are you sure you want to introduce to me the lady in the "Dark Forest", Miss Zhuang Yan who is the face of the trilogy? !!