From Almighty Scholar to Chief Scientist

Chapter 254: Wave Absorbing Efficiency Increased by 15%? !
First look at the doctoral students.

Some of these Ph.D. students came here without a doctor's recommendation, and some were direct Ph.D. students.

The first person is Bai Hongyuan, a direct Ph.D. student, who studied at the School of Mathematics, Beijing University, with a four-year average GPA of 4.2.

Beijing University has a 4-grade point system, which means that even if you get 90 points or more in all subjects in four years of university, the highest grade point can only be 4.0.

So a grade point of 4.2 means that it has made some achievements in line with the grade point bonus policy, and for mathematics undergraduates, they have basically published papers.

Lin Xiao looked at his resume, and it turned out that he had published SCI papers, and he had published papers from the three districts.

This is very good for an undergraduate, at least it shows that he has a certain scientific research ability.

Of course, Lin Xiao did not let it go easily, but directly found the paper published by the student according to the DOI number attached to the resume.

"Conjugate Gradient Method in Random Variables", studied the conjugate gradient method for solving linear equations whose coefficients are measurable functions, and determined the convergence rate of the method.

It seemed pretty good, but when Lin Xiao downloaded the paper and looked at it, he shook his head.

The paper didn't quite satisfy him.

Although the method used is good, it just lacks innovation, and innovation is very important in Lin Xiao's view.

Of course, considering that this is the thesis of this undergraduate student named Bai Hongyuan, the lack of innovation is actually not a particularly important thing.

As for other things like what student position Bai Hongyuan has held, or what activities he has participated in, it is not within the scope of Lin Xiao's consideration, because these are social skills, or how to handle affairs, these things are all important. It has nothing to do with academic ability. For Lin Xiao, academic ability is the most important thing. Their mathematics is not social science. Because social science needs to do social surveys and other things, so social ability is also a manifestation of ability, while mathematics Just be smart enough and take your academics seriously enough.

Then he stopped paying attention, put Bai Hongyuan aside as a candidate, and looked at the second person.

The second one is also a direct Ph.D. student named Xue Wanqing, who is also a graduate student of the school. What caught Lin Xiao's eyes was that this student had participated in Qiu Chengtong's mathematics competition for college students, and also won the individual gold medal in the number theory group. Qiu Chengtong's mathematics competition for college students was a It is quite a valuable mathematics competition. The most important thing is that it is different from the ordinary national college student mathematics competition. The latter tests problem-solving skills, while the former tests the reserve of mathematical knowledge.

Although the two have different emphases, Lin Xiao prefers the one with more mathematical knowledge, because it means that he likes mathematics and has accumulated enough. If he does not accumulate much, he will definitely not get the gold medal .

In addition, this Xue Wanqing has other grades and has also published mathematics papers. Although he is not a three-region SCI like the previous one, but being able to publish papers shows his ability.

Remembering this name, Lin Xiao continued to look at the third student. The third student was also very good. He had won the gold medal of CMO, but he did not enter the national team to participate in the IMO. Of course, he is also very good. I also participated in many competitions in college.

Next is the fourth, fifth...

Nine of them are PhD students, and the rest are master students.

All in all, these people who are able to secure a postgraduate study in the School of Mathematical Sciences of Peking University are very excellent, and there are even two students from foreign countries, one of whom is a master's degree in mathematics from Paris Normal University. He wants to apply for his Ph.D. The other is a mathematics undergraduate student at Princeton University who wants to apply for his master's degree.

In this regard, he naturally passed it directly, and he was not in the mood to teach foreigners.

Finally, after selection, four doctoral students and six master students were left behind. After an interview, the final students were selected.

The time of the interview needs to be coordinated by the college. After he reported the students he selected, he stopped worrying about it and continued to study the crystal structure that can realize the magnification and reduction of X-rays.

……

Huaguo Aviation Industry Group, Chengfei Research Institute.

The Chengdu Aircraft Research Institute is the place where Huaguo's fifth-generation fighter J-[-] was born. Yang Wei, the chief engineer of the J-[-], once served as the director of the Chengdu Aircraft Research Institute.

Today, Chengfei Research Institute welcomes a person, Ma Gaoliang.

Ma Gaoliang came here in person with the materials Lin Xiao gave him.

Fighter stealth coating material!
Such an important thing, of course, deserves him to come over in person.

Soon, he found the current Director of Chengfei Research Institute, Shen Zhi.

Seeing Ma Gaoliang, Shen Zhi said with a smile: "Director Ma, he doesn't go to the Three Treasures Hall for nothing, what's the purpose of coming here in person?"

"Hehe, there is something important." Ma Gaoliang said without nonsense, "Among your research institutes, who is the expert who understands invisible wave-absorbing materials the best?"

"Absorbing material?" Shen Zhi was taken aback, then thought for a while and said, "It should be...Professor Zhang Heng from the third research department. He is in charge of researching the overall layout of the absorbing coating on the surface of our fighters. There is a lot of material research.”

"Okay, then I need to meet with Professor Zhang Heng now. I have an important matter to entrust him with." Ma Gaoliang said.

Hearing that Ma Gaoliang seemed very serious, Shen Zhi was a little curious, but he didn't say much, he got up and said directly: "Then you come with me, but if Professor Zhang Heng is doing research, if he disturbs him, the two of us may have to talk about it." scolded."

Director Ma couldn't help laughing: "You are the director, and this Professor Zhang is still scolding you?"

"Professor Zhang Heng solved the problem of the microwave-absorbing coating on the surface of our J-[-]. If the old man wants to scold me, what can I do?" Dare to find Professor Zhang at this time."

Director Ma laughed and said, "That's true."

He respected Lin Xiao, and he naturally respected scientists like Professor Zhang Heng.

In the past, foreign countries believed that Huaguo could not build fifth-generation fighter jets, because the standard of fifth-generation fighter jets has four S, that is, four super: ultra-low detectability (stealth), supersonic cruise capability, super maneuverability, and super information superiority.

In 2011, Huaguo announced the photos of the J-20, and some people abroad and even domestically expressed disbelief and even ridiculed it, thinking that Huaguo would not be able to build a fifth-generation fighter jet within 4 years, because at that time foreign countries believed that Huaguo could not build it at all. Produce a fifth-generation fighter that can meet the [-]S standard.

The test of supersonic cruise capability is the engine. At that time, we used the Russian engine instead, because our turbofan 15 engine had not been produced at that time, but no matter what, this S can be regarded as achieved, and then the super maneuverability, This also tests the engine, followed by the overall structural strength of the fuselage. The super information advantage is the combination of various sensors to achieve advantages in various aspects such as radar, infrared, and electronic warfare. Finally, it is stealth.

Each one is very critical, and the stealth problem solved by Professor Zhang Heng is also the key among the keys. After all, the fifth-generation fighter is called a stealth fighter because of the importance of its stealth ability.

Therefore, the contribution of Professor Zhang Heng is quite large.

And it was under the hard work of experts like him to solve various problems that the J-[-] officially took off. The loud noise caused by the sound boom over Rongcheng that year swore that the fifth-generation fighter jet of Huaguo was officially born.

Soon, under the leadership of Shen Zhi, Ma Gaoliang and he came to the third research department. After asking people, they came to the door of one of the laboratories.

"Bang bang."

knocking.

"Is Professor Zhang here? I'm Shen Zhi."

But no one responded, and Shen Zhi knocked a few more times. Finally, the door of the laboratory opened, and a dark-faced man who looked 50 years old stood behind the door and said, "Director Shen, how much did I say?" Do not come to me when I am researching something!"

Shen Zhi shrugged towards Ma Gaoliang, didn't care about Shen Zhi's tone, but first introduced Ma Gaoliang next to him.

"Professor Zhang, I know, I know, Director Ma Gaoliang of our Science and Technology Bureau is here to ask you for something."

"Director Ma?" Zhang Heng glanced at Ma Gaoliang and snorted, "What's wrong with the Science and Technology Bureau? The director of the Science and Technology Bureau can disturb people's research? Do you know how important it is to design the stealth layout of the J-[-]?"

J-[-], the fifth-generation carrier-based aircraft that Huaguo is developing. Unlike fighter jets, carrier-based aircraft are aircraft that can take off and land on an aircraft carrier. Huaguo has never produced a fifth-generation carrier-based aircraft before. There is a big gap in the strength of naval battles with a foreign country.

Ma Gaoliang smiled, and was also not angry, but said: "So I came to you today to provide you with a helping hand."

"Assist?" Zhang Heng was puzzled, "Director Ma also studies invisible materials? Is the threshold for being a director so high?"

"...Uh, no." Ma Gaoliang was helpless. Is there something in your words?

He waved his hand and said, "I want to show you a new theory, which is very important for your development of absorbing materials and their layout..."

After some explanations, Zhang Heng finally became interested: "Can you clarify the coherent superposition of waves? Master the laws of interference and diffraction?"

If this is true, it is really useful for his research.

So Professor Zhang Heng didn't talk nonsense, he got this theory from Director Ma, and began to verify whether it was really useful.

For people like him who engage in applied research, pragmatism is the most important, so he doesn't care how important the proof process of this theory is, he only cares about whether the final results can be applied to his research.

And this is very simple, since the final result is a partial differential equation, then he can directly substitute various values ​​into this equation, and then use the computer to perform simulation calculations.

Soon, he completed this step, and then modified the surface of the absorbing material, mainly using this partial differential equation for optimization. After some effort, the simulation began.

The calculation of the computer drives the internal fan to rotate rapidly.

After a while, the result appeared.

Zhang Heng stared suddenly.

After the surface of the wave-absorbing material optimized by this partial differential equation, the wave-absorbing efficiency has increased by 15%!

"This... is incredible!"

For the first time, Zhang Heng, whose expression remained unchanged, showed such a surprised look.

But after the surprise, it was an incomparable surprise!
　Chapter 251 is under review

　　
　
(End of this chapter)