On this day, a big event suddenly happened in the spacecraft: Academician Ding of the Wild Wolf Design Bureau released a voice and wanted to recruit a graduate student among the undergraduate graduates, which caused a sensation among the entire group of candidates!

Academician Ding has always trained doctors, but this time he wanted to recruit a master's degree, and the opportunity was extremely rare.

Everyone is well aware that early exposure to these top experts will have a significant impact on their future academic careers.

Because there are so many applicants, it is impossible to come in for an interview. The staff had to strengthen the rigid conditions for registration, and only then did the number of applicants drop to less than 50.

Zhang Yuan opened the registration interface and saw that he was still able to register because of his hard conditions and test results, so he breathed a sigh of relief.

At this time, Professor Wang Zhong sent a video.

“…… That old guy has been convinced by me, and it's up to you to do the rest. If there is someone more suitable than you and is competitive, it is no wonder that others. Pick one out of fifty masters, are you confident? ”

"Yes!"

"That's good, I'm waiting for your good news!"

……

After a short preparation, it was finally time for the interview.

There were a total of five interviewers, two of whom were former colleagues of their father, who were more familiar with each other, and they all cast kind eyes.

Sitting in the middle was Professor Ding Zhaodong, and on the far left was Captain Ma Tao, who also looked at Zhang Yuan with a kind face.

"Don't be nervous, young man."

Captain Ma glanced at the materials on the table, and first asked, "You are Lao Zhang's son, we all know it, so there is no need to say more about introducing yourself." I have a question, what is the one thing you learned the most from him? ”

Nervous, with enough strength, he is not nervous at all.

Zhang Yuan came casually: "Humble personal character, excellent study habits, life style that is not limited to external objects, lofty goals and ideals!" ”

"Stop!"

Seeing the slightly strange smiles of the professors around him, Captain Ma asked again, "Can you tell me what shortcomings he has, what shortcomings you can't tolerate?" ”

Zhang Yuan was stunned in his heart, could it be that this captain has some old gap with his father?

Or just want to make a joke and relieve the tense and serious atmosphere?

It's possible.

Zhang Yuan thought for a while and said: "He always uses his IQ to be harsh on others, which I think is difficult for ordinary people to tolerate. He thinks many things are very simple, so he casually asks others to do them, but what he thinks is very simple, others have to do it for a long time, and they may not even be able to make it...... So he always lost his temper for no reason. ”

Everyone smiled slightly.

Zhang Yuan was a little confused about his answer, whether it was good or bad.

Then there is the time for serious questions, and naturally it will not be such ordinary questions.

One of the professors asked bluntly, "I once read your paper on robot kinematics, and it was indeed a very good article." However, have you ever considered the problem of constraining the calculation of robots with few degrees of freedom? ”

"Many industrial robots in reality do not require too many degrees of freedom, and the algorithms in this regard are also different...... What do you know about the 2-RPS-2-SPS four-degree-of-freedom parallel robot? Just say an idea, no need to go into a long speech. ”

Zhang Yuan thought for a few seconds, in fact, this problem is relatively basic: "In terms of the complexity of the structure and the production cost, the parallel robot has great advantages in terms of completely symmetrical parallel mechanism...... The characteristic matrices of the four degrees of freedom are 3T1R, 2T//2R, 2T⊥2R, 1T3R, 3T2R, 2T3R, and 3T3R. ”

"Let's start by discussing the mechanical generation of these 7 kinematic connections in the form of a single open chain......"

Although he was asked not to speak at length, he still spoke for more than ten minutes.

The professor narrowed his eyes and nodded, "That's a good answer." ”

It's just that it is not easy to come up with so many things clearly, which shows that Zhang Yuan's basic knowledge is very solid, and he has quick thinking and a bright head.

“…… Do you have research on the latest optical chips? Why not focus on the development of quantum chips with more computing power? ”

Zhang Yuan thought for a few seconds and replied, "...... Photonic chips are computing architectures based on photonic circuits, which are equivalent to the use of countless miniature optical switches on the chip, similar to the logic grid in semiconductor chips...... Photonic chips use a combination of light rays of different wavelengths, phases, and intensities to process information in an array of complex mirrors, filters, and prism structures. ”

“…… Like microelectronics, it is a semiconductor architecture based on silicon materials, so it is equivalent to an extension of traditional chips. Its computing power is more than 10,000 times that of ordinary silicon-based chips, and with the current technology, there is still room for upward development. ”

"Although the computing power of a quantum computer can reach 100 million times or even a trillion times that of a silicon-based chip, it must achieve a relevant number of quantum entangled states. 40-50 entangled states is the limit of the current technology, and it is very difficult to move upward. But this amount of entanglement, the computing power is not as good as that of traditional silicon-based chips......"

"Therefore, although quantum chips are good, there is no major breakthrough in theory, and it is difficult to develop upward, so it is not the mainstream of current research."

"Good, rightly so." The professor nodded slightly. This examines not only the theoretical foundations, but also the breadth of knowledge.

Many professors raised a lot of questions, and Zhang Yuan responded to them one by one, calmly.

"I'll have a question too." Ding Zhaodong suddenly spoke.

"Excuse me."

Academician Ding Zhaodong said slowly: "What do you think about the industrial production of the new civilization? In your opinion, what is the biggest factor restricting the development of the new civilization? ”

Is it that big of a problem?

Zhang Yuan cleared his throat and replied: "We do have some good industrial foundation, for example, the spacecraft carries the most advanced lithography machines, some nanomaterial production rooms, and some industrial machine tools. We are able to produce some components, but many upstream value chains are completely disjointed. ”

"For example, chloroform, caprolactam, acrylic acid, the most basic chemical raw materials, only a small amount of inventory, when used up, there is no way to produce. If biosynthesis is used, the cost is too high. ”

"If you successfully reach the target planet and obtain a lot of material resources, you have to start with the development of the most basic raw materials. In my opinion, the biggest factor restricting the development of civilization is...... Population. The population is too small for the entire industrial system to get up. ”

"I once read a report that the minimum number of people who maintain the industry's industry on the planet is 1.6 billion. Although the quality of our population is high enough, the number is only half a million, which is far from enough. ”

"It makes sense, in fact, this is also a point of concern for us......" Before Academician Ding could reply, a professor took the lead in nodding.