The military-industrial scientific research system of the academic master.

When Liu Hongbo received the task of "helping Chang Haonan complete the compilation of a finite element method course textbook" about a week later, he agreed with almost no psychological fluctuations.

Already used to it.

Besides, now it's just to help his fellow juniors. They have the same seniority, but the age gap is a little bigger, so it's not embarrassing.

He was just very lucky that Du Yishan came out halfway and snatched Chang Haonan away from him——

If there hadn't been such a thing, now he would be a scapegoat for his own students.

Oh, he can't even be considered his student, because Chang Haonan is still technically studying for an undergraduate degree.

In short, if that were the case, he would probably have no shame in continuing to work in the education world.

As for what made Chang Haonan write a book, put his name on it and reach the top of his life...

Liu Hongbo never thought about it in that direction.

It's not just a matter of academic ethics.

But before anyone does this kind of thing, he must weigh the other person's weight——

Look at the circle Chang Haonan is in contact with now.

It can be said that there are scholars who talk and laugh, but there are no idle people in the contacts.

Even if such a person becomes his graduate student, it is absolutely impossible for him to be manipulated.

Don’t you see that even Du Yishan rarely asks about Chang Haonan’s projects now...

At least the former has paved a lot of roads with his own influence.

If it were Liu Hongbo, he would have to write the words "morality and unworthy" on his forehead.

It will only embarrass both teachers and students.

So it’s better to be brothers.

He still has this bit of self-awareness.

"call……"

Liu Hongbo, who returned to the office, spread the two-page fax he got back from Tang Lintian on the table and breathed a sigh of relief.

What was written on the paper was the outline and basic ideas that Chang Haonan had determined for that textbook.

"Start with vectors?"

He read it over and over again, but still felt that the content inside seemed a bit too lengthy.

At least the contents of the first three chapters should have been covered in the basic courses of the first and second year undergraduates, so there seems to be no need to repeat them here.

After thinking for a moment, Liu Hongbo picked up the two pieces of paper on the table, walked out of the office quickly, and came to his laboratory.

It was already the fifteenth day of the first lunar month. Although there were still a few days before the school officially registered and started, many students had already returned to school early.

"Teacher Liu."

The three graduate students who were busy in the laboratory saw the instructor who suddenly walked in. They said hello casually and continued their work.

As a relatively young professor, Liu Hongbo himself often appears in the laboratory, so the students are not surprised.

But the purpose of his coming today is quite special.

"I have a question to test you."

Liu Hongbo came to the blackboard at the other end of the laboratory, picked up a piece of chalk from the side, and wrote a two-dimensional matrix z = [1, -1, -1, 1] on the blackboard.

When he turned around, he saw three confused expressions.

"Teacher Liu, this is to..."

The three students who came back early to start experiments are all senior masters or doctoral students, and they are already a little unfamiliar with the exam format.

What's more, Liu Hongbo has never played this trick in the past.

"Suppose that in plane stress analysis, the stress measured at a point in the non-primed coordinate system is the z on the blackboard. Now you are asked to establish its components in the primed coordinate system. What will you do?"

The three students looked at each other for a few seconds, but this kind of question obviously didn't stump them, and one of them quickly wrote the answer on the blackboard.

z'=PzP(T)

Where P=[cosθ, sinθ, -sinθ, cosθ].

"very good."

Liu Hongbo nodded with satisfaction:

"Then let's change to a slightly more complicated question."

He erased the things on the blackboard and drew a beam fixed to the wall.

This is a beam with a bending stiffness of EI. The load on the unit length is P. The spring stiffness at the other end of the beam is k. Now it is necessary to use four finite difference nodes to establish the control equation of the beam response.

This time, no one was able to provide results quickly.

In fact, from the looks in the eyes of the three students, Liu Hongbo knew that they should be very confused about this issue.

After a while, the boy who just wrote the answer said with confusion:

"Teacher Liu, is there any connection between these two questions?"

"they……"

At this time, Liu Hongbo suddenly realized that he himself could not give a systematic answer in words.

"Simply put, the first question can be seen as the theoretical basis for solving the second question."

"..."

This explanation is obviously unsatisfactory.

"Teacher, I remember you said in class before that the theoretical basis for airplanes to fly is Newton's third law proposed in 1687, but it was not until 1903 that humans built the first airplane..."

There was obviously some dissatisfaction in the other person's tone.

"you're right……"

Liu Hongbo stared at the blackboard for a few seconds, then patted the student next to him on the shoulder:

"It's okay, you can continue your work."

After saying that, he strode out of the laboratory under three inexplicable looks.

In fact, what Liu Hongbo raised was just the simplest linear analysis problem in rigid body mechanics.

If these students are given enough time, they should not be unable to solve it.

But the reactions of the three of them just now showed that for an inexperienced person, the distance between basic mathematical knowledge and practical engineering applications is not as close as he had imagined before.

In other words, Chang Haonan was right in designing the knowledge structure of the textbook.

The first three chapters are not useless.

The density of knowledge in university classrooms is often very staggering, and there is not much time for students to slowly think and react. If the textbooks are written in a simpler way, it will easily lead to students getting stuck somewhere and never following the course again. The situation of not thinking in class.

So there is a saying -

In math class, I bent down to pick up a pen. When I raised my head again, it was as if I was listening to heavenly scriptures.

Perhaps it is because compared to other people who compile textbooks, Chang Haonan himself is still in his student days, so he grasps these pain points more accurately.

Liu Hongbo shook his head and sighed as he walked:

"MD, that's outrageous."

He originally planned to continue to subcontract layers of work and leave those basic contents to his graduate students to write.

But now I have changed my mind.

Obviously, Chang Haonan, a junior fellow student, can be embraced not only in the academic world, but also in the education world.

So he decided to write the book himself.

"Just think of it as a way to experience Professor Chang's educational ideas in advance..."