"The universe is big, the particles are small, the speed of rockets, the ingenuity of chemical engineering, the changes of the earth, the secrets of living things, the complexity of daily use, and mathematics is everywhere."

In the technical seminar of Jiangnan Shipyard, Cheng Nuo did not introduce himself in a hurry, but first wrote the above sentence on the blackboard, put down the chalk, turned to the people under the podium and smiled: "Is there a comrade who is willing to take the initiative to stand up and read the above sentence aloud?" ”

The masters under the podium, you look at me, I look at you, there is a look of doubt in my eyes, I really don't know what this new teacher wants to express in his words.

Fortunately, Cheng Nuo expected all this, and walked down from the podium to the center of the classroom and said: "The gentleman avoids the three ends, that is, to avoid the pen end of the scribe, to avoid the edge of the samurai, and to avoid the tongue of the debater, I can understand everyone's performance, let me introduce myself first, my name is Cheng Nuo, I am the newly hired consultant of our Jiangnan Shipbuilding Institute, and I am also the main lecturer of this class, and we will work together for a long time in the future." ”

After a pause, Cheng Nuo turned around and pointed to the line of words on the blackboard and said seriously: "In this way, whoever is the first to take the initiative to stand up, I will add 10 points to him, as for what this usual point is for, it is very simple."

It is an important part of the comrades' overall score in this class, and the more points they usually have, the higher the overall score, and the better the evaluation of the individual. ”

As soon as the words fell, Li Nan suddenly stood up from the bench.

"Teacher, I'll come......"

But he ignored it, and he sat only on one end of the bench, and there were other comrades at the other end.

Standing up abruptly caused the center of gravity of the bench to be unstable, and it fell over instantly, and his companion was immediately thrown on his back.

"Oops, it......"

"I'm sorry I just ignored you, are you okay?"

Seeing that the situation was not good, Li Nan instantly reacted and wanted to help his companions, but he was still preempted by Cheng Nuo, and joked while supporting: "It seems that Comrade Li Nan attaches great importance to this ordinary time, although he is reckless, but this positive and enterprising attitude is still worth learning from." ”

Li Nan scratched the back of his head a little embarrassed, and said with a little embarrassment: "You don't have to learn from me, it's too consuming for your comrades." ”

Fortunately, no one fell into any major incidents, patted the soil on his body, and the classroom atmosphere was restored again.

However, there was such a small episode, and the tension that had previously permeated the air gradually dissipated.

Looking at the board book on the blackboard, Li Nan breathed a long sigh of relief and read it seriously:

"The universe is big, the particles are small, the speed of rockets, the ingenuity of chemical engineering, the changes of the earth, the secrets of living things, the complexity of daily use, and mathematics is everywhere."

As the last word fell, Cheng Nuo took the lead and applauded.

"Very good, the pronunciation is very accurate, and the feelings are also very abundant, add ten points to you!" Cheng Nuo nodded with a smile, looked at the "injured" comrade before and said: "But in view of the fact that Comrade Li Nan's ten points have caused some small troubles to the same table, in order to make up for him, add an additional 5 points to the same table, you have no opinion, right?" ”

Li Nan shook his head again and again: "I have no opinion, it was my mistake." ”

"Not bad." After receiving a positive reply from Li Nan, Cheng Nuo looked at the others with a smile: "Do you have any opinions?" ”

"No~" Everyone said in unison, looking at the two of them with a faint look of envy.

Just as Li Nan breathed a sigh of relief and was about to sit down with a little happiness in his heart, he was stopped by Cheng Nuo.

"Slow, Comrade Li, I haven't finished saying this yet, don't sit down in a hurry first, talk about your understanding of this sentence, it's best to combine it with the scene of our shipbuilding." Cheng Nuo smiled and encouraged: "By the way, this question is an additional question, if you answer it correctly, you will also get extra points." ”

Li Nan's mind went blank in an instant, and his mouth opened for a long time before he said, "Ji ...... Calculating the length of the hull requires mathematical ......"

"What about the back?" Cheng Nuo asked.

"I don't know later." Li Nan hooked his head, not daring to look directly into his eyes.

Cheng Nuo was a little helpless, so he had to raise his hand to let the other party sit down.

However, there is a good beginning in front of Lixin, and the people in the back speak enthusiastically, and there are all kinds of ideas:

"Statistics can be applied in ship positioning, help ship positioning technology to accurately position, facilitate reliable ship driving, by collecting ship position data at different time points, infer the ship's driving route, and predict the ship's subsequent driving route to ensure the safe driving of the ship......"

"There is also geometry, which can be used to calculate and plot the shape of the hull, the dimensions of the ship, the curvature of the hull, and so on."

"There is also the principle of trigonometry, through which the angles, distances and heights of ships can be calculated and measured. For example, triangulation can be used to measure the height of a ship's hull to determine if the hull meets the design requirements......"

It seems that everyone is gossiping, but Cheng Nuo actually found that basically he brought back from Europe to answer the Chinese workers, and most of the knowledge was the knowledge taught in the night school he founded.

The corridor in the middle of the classroom, like the Chu River and the Han border, separates the Jiangnan Shipyard from the Chinese workers in Europe.

The more he talked, the more confident he became, and the more he began, he began to hang his head a little frustrated.

Looking at the continuous addition of points on the other side, the workers of the Jiangnan Shipyard, who originally regarded themselves as the masters, changed their original arrogance and began to be a little unable to sit still.

The young man next to him looked left and right, and the more he looked, the more panicked he became, and he hurriedly pulled the master who closed his eyes and recuperated.

"Master, we have to do something, or we will be inferior in our factory in the future, how can this be reasonable?"

The master sat firmly on the Diaoyutai, slowly picked up the enamel cup, blew off the tea foam on the water, and only after sucking it for a while did he say: "This is what to do, don't worry, besides, when the foreigners were in control, the technical things were not taught to us, how can we compare with others when we stand up?" ”

After all, he is young, even with the guidance of the master, Xiao Young still can't sit still: "But the master, you said before, you can't sit still, now let's watch people eat meat, it's not okay." ”

"Enough!" Master Fu stared, covered the teacup with one hand and buckled it on the table: "What's the matter, I don't listen to my words?" If you know everything, you need to sit here? Birds want to fly high first flap their wings, people want to grow up first study, only see the battle of will, what big things can be achieved? People say you just listen to it! ”

As he spoke, the master took out a notebook and pen from his waist and spread them on the table.

Seeing that the young man hadn't reacted yet, the master snorted coldly: "Live to be old, learn to be old, and still don't listen carefully?" If you really want to fight for breath, then study hard! ”

With the master's proofing, even if there is dissatisfaction in their hearts, these workers in Jiangnan Shipyard have also begun to correct their attitudes, no matter how provocative the Chinese workers on the other side are, they will turn a deaf ear.

Cheng Nuo naturally saw everything below in his eyes and remembered it in his heart, knowing that he couldn't go on like this anymore, so he clapped his hands and stopped answering.

"Everyone's answer is very good, but at the moment for our shipbuilding industry, although mathematics can be used in many places, but everything has a priority, today we are going to learn is hull mathematics lofting, then what is lofting, please ask us here to answer the most experienced master of shipbuilding."

After saying this, Cheng Nuo took the initiative to applaud again, and looked at the master expectantly.

This time, the master did not refuse, put down the pen in his hand, Shi Shiran stood up, arched his hand to the surroundings and said calmly: "Then I will throw bricks and lead jade, if there is anything inappropriate, the comrades present are welcome to correct it in time." ”

Nodding at Cheng Nuo, Master Fu said steadily: "The so-called lofting, its direct meaning is to enlarge the design drawings drawn on the drawings according to a certain scale scale into a 1:1 real scale pattern, of course, it may also be 1:5, or even 1:10, and so on."

In terms of shipbuilding, the purpose of lofting is to make various parts of the hull, such as the ship's plate, keel, bottom, etc. Once the lofting is complete, each cross-section of the hull is transferred to the appropriate material, where it is cut, riveted or welded to form the complete hull structure. ”

"Well said, the master is really the master, and he hits the nail on the head!" Cheng Nuo personally walked up to the master master, sat him down, and said: "Hull lofting is a crucial step in the shipbuilding process, which ensures the accuracy and consistency of the hull design.

With lofting, our hull designers can verify the curves and dimensions on the design drawings and translate them into actual construction instructions, making hull construction work more precise and efficient. ”

Returning to the podium, Cheng Nuo directly erased the mathematical quote and directly drew a sleek curve: "Put it in mathematics, it is easy to understand, it is used to convert the two-dimensional curve on the hull design drawing into the three-dimensional shape of the actual hull......"

Generally speaking, there are two main purposes of lofting, the first is to make a practical check of the original design and modify the unreasonable or wrong points in the design.

The second is to provide sketches, sample sticks, samples, and sample boxes for each process in the future, such as feeding, processing, assembly, launching, and sprinkling, as the basis for construction.

Its work generally consists of three parts: linear lofting of the hull, structural lofting and outer plate unfolding.

Taking the 10,000-ton giant ship that Cheng Nuo and the others are building as an example, draw the linear diagram of the 10,000-class ship at a scale of 1:100, and if there is an error of 0.5 mm on the drawing, this error will reach 50 mm after magnifying to the actual size.

In order to avoid mistakes in the middle, Cheng Nuo deliberately selected some more practical mathematical principles and calculation methods, summarized them, and taught them to the workers present, so as to carry out manual mathematical lofting.

The derivatives of the spline used in the mathematical lofting of the hull at each endpoint are the information of the spline, that is, the scope of the computational geometry.

Among them, the main theory of mathematical lofting comes from Mr. Su Buqing, the founder of the school of differential geometry in our country, known as "the brilliant mathematical star in the Oriental country", "the first geometer in the East" and "the king of mathematics".

At that time, Su Buqing was no longer in his prime, but he was still very concerned about the practical problems of production. He led his students to many factories, and later went to the Jiangnan Shipyard to do hull mathematical lofting, and went to the Shanghai Tool Factory to teach classes to workers and technicians.

Solving the problems encountered in production for them has greatly improved the scientific and technological level and productivity of related industries.

Later, on the basis of the hull mathematical lofting project, Su Buqing, who was in his old age, founded a new discipline of "computational geometry" and opened up a new field of geometric research. Later, the Department of Mathematics of Fudan University won the National Science Conference Award for projects such as "Hull Mathematical Lofting".

Although many of these things need the assistance of computers and are not applicable to Cheng Nuo at this time, there are still some applied mathematics content, which greatly helps Cheng Nuo and them.

It is in this process of learning and discussion that the old employees of Ouhua Workers and Jiangnan Shipyard have begun to slowly abandon their previous suspicions, and the relationship has become more and more familiar, for example, Wang Tiehammer has pestered the master to ask questions, and the master will often find Wang Tiehammer to discuss in terms of new technology, and everything is developing in a good direction.

On the other hand, Morgan, who "boasts of his construction work", directly dismisses it, picks up his cigar and takes a puff:

"Jack, do you know where cigars taste best?"

Jack hurriedly stepped forward and replied, "Of course, sir, the cigar in your hand tastes the best." ”

"No, no, no, of course, the cigars are good in Cuba, with a mellow ferment, and only the fertile red soil of Cuba can give birth to the best tobacco in the world!"

The subordinate cooperated: "What you said is that only an upper-class person like you is worthy of smoking such a cigar." ”

The smoke in Morgan's mouth was all spit on the faces of his subordinates, and when he saw that the other party dared to be angry but didn't dare to speak, he was obviously angry but couldn't be angry, and couldn't help but be proud: "Only if the sun never sets on the British Empire, can we build the most advanced steamship in the world, the French?" NO, Chinese, NO. ”

After saying this, Morgan laughed directly, especially after listening to his subordinates report on the progress of shipbuilding, he felt that he had the chance to win, and everything was just a chicken and a dog in front of him.

The subordinates were not as optimistic as Morgan thought, hesitated, and finally decided to tell Cheng Nuo's teaching: "Sir, I heard that the Chinese have specially started to conduct shift training, should we also conduct training?" ”

Morgan didn't care: "That's because they don't know anything, that's why they need training, we are already experienced, where can we use to be like them?" It's a meaningless waste of life, and God and his old people can't stand it. ”

Before his subordinates could react, Morgan suddenly thought of something funny: "And that with the ability of our British, it seems that everyone can go over to be a teacher for the Chinese, so are we bullying them too much, otherwise I will send a few colleagues over to carry out humanitarian aid?" ”

Originally, the subordinates wanted to tell Morgan that Cheng Nuo's side not only had successful training, but also that the construction progress had been on par with the British, and even faintly surpassed it, which was not at all what Morgan imagined himself.

But thinking of the other party's arrogant appearance just now, the subordinates' hearts rekindled anger.

"Poor fellow, don't you know that this place is not under God's jurisdiction?"

(End of chapter)