"Hello, Yu, please come in." Feng Karmen showed a kind smile and invited Yu Hua in.
"Thank you." Yu Hua nodded and thanked him. He entered the small house with Chinese style structure and saw the American Colonel George in uniform standing in the house. He was startled for a moment and then smiled.
Yu Hua did not expect that the US military would also send people. Of course, they were definitely not here for him.
During this period, the U.S. Air Force had not yet been born. The U.S. military aviation force had always been under the jurisdiction of the Army, referred to as the U.S. Army Aviation.
Colonel George nodded slightly and politely returned Yu Hua's greeting, with a serious face and no words.
Yu Hua didn't care about the other party's indifferent attitude. After all, in the eyes of these Americans, China has always been a symbol of backwardness. If he wants to be recognized by foreigners, the country must become stronger.
"Please sit down, Yu. We only have fifteen minutes. How much do you know about aerodynamics?" Von Karman motioned Yu Hua to sit down, smiled, and asked after reminding him.
"Very few. I only know that an airplane can fly because of lift, and the parameter that determines the flight speed is drag." Yu Hua sat down, shook his head, and answered truthfully.
Yu Hua was extremely unfamiliar with the comprehensive subject of aerodynamics. If he had to understand it, it would be the various familiar aerodynamic layouts of later generations.
Tracing back to the underlying principles and theoretical basis of the aerodynamic layout of modern fighter aircraft is not something a military fan should do.
"It's very valuable to know this. Since your mathematical calculation ability is very good, can you solve this problem?" Fon Karmen showed a kind expression, nodded in praise, and then took out a piece of prepared draft paper and handed it to Yu Hua.
.
Yu Hua took the draft paper and carefully reviewed the question. The content was an air motion problem based on Euler's differential equation of motion, which was characterized by complex and tedious calculations and a large amount of calculations.
This question is extremely difficult for ordinary students, but for Yu Hua...
It is not as difficult as when doing discrete logarithms.
He took out the pen he carried with him and without stopping at all, wrote the calculation results required for the question directly on the scratch paper: "Professor Carmen, take a look, is this data correct?"
Fon Karmen frowned slightly when he saw Yu Hua's rather frivolous behavior. Almost instantly, his good impression of Yu Hua dropped a lot: "Yu, don't you need to take another look?"
Just take a look and write down the calculation results directly?
This kind of thing that is like a fantasy does not exist at all. As the question maker, von Karman knew very well the difficulty and nature of the question he prepared.
This question requires a lot of calculations, and even an extremely smart person would need at least ten minutes to solve it.
"No need, Professor Carmen." Yu Hua shook his head.
"Okay..." Although this behavior disgusted Von Karman, he still suppressed the anger in his heart and took the scratch paper with his hand.
When his eyes looked at the calculation results, Von Karman was obviously stunned. He looked at it again, with an incredible expression on his face, as if he had seen a ghost.
Incredible!
It’s incredible!
At this moment, all the anger seems to be like the ice and snow on the eaves in winter, melting and dissipating when encountering the bright and bright sunshine.
"The calculation result is correct, Yu, how did you do it?" The situation he encountered was extremely shocking. Fon Karman felt his throat was a little itchy, coughed twice to relieve the atmosphere that had just filled the air, and asked Yu Hua.
Yu Hua smiled: "I have a very good talent in mathematics. I did all these calculations in my head."
"Fluid motion with complex mental arithmetic?!" Von Karman was stunned again. Yu Hua's answer made him at a loss. Ordinary people didn't know this concept, but he knew it very well.
The calculation of fluid motion is very cumbersome and complex. Generally speaking, just calculating a parameter often takes dozens of minutes or even hours, and consumes dozens or hundreds of pieces of scratch paper.
That’s it, you still need to pass the math level!
Without sufficient mathematical skills, it would be impossible to complete such astronomical mathematical calculations.
However, Yu Hua only took a few breaths to complete the calculation through mental arithmetic...
Von Kármán said that he had never seen such outrageous mathematical calculation ability in his life.
"Yes, this is my talent." Yu Hua nodded and smiled.
Von Karman took a deep breath, and his impression of Yu Hua changed again. From an ordinary student to a genius, no, Yu Hua's current performance could be called a super genius.
However, this evaluation still needs to be verified.
Next, with a scientific research mentality, Von Karman gave a series of questions that were moderately difficult but required a lot of calculations. Yu Hua knew that this was from Von Karman's test, using the highest computing power of the thinking computer to calculate the speed per second.
Analyze and calculate these data with a speed of 500 million operations and give accurate parameters.
Fifteen minutes later.
"Yu, you are a super genius." Von Karman got the last data and ended this encounter that was entirely centered on mathematics. Looking at Yu Hua, his mind had a new understanding of the limits of human mathematical calculation capabilities, and his heart was full of thoughts.
Surprisingly, no wonder Zhao Zhongyao asked Yu Hua, a student, to be his assistant.
This kind of terrifying mathematical calculation ability that challenges human imagination is the dream of almost every scientist.
At this moment, even Von Karman wanted to recruit Yu Hua as his assistant, responsible for processing and calculating extremely large experimental data.
"Thank you for your compliment, Professor Kamen. I think my performance should make you feel the 'Chinese intelligence'." Yu Hua smiled, spoke modestly, and stared at von Kamen in front of him with a hint of expectation.
"I feel it. I am shocked by your intelligence and mathematical calculation ability."
Fon Karmen sighed, looked at the expectation in Yu Hua's eyes, showed a kind smile, took out a personal business card from his pocket, then left his exclusive personal signature with a pen, and then handed it to Yu Hua: "Yu, the time is up, this is
My business card, I think you know what it means."
"I hope you can come to California and come to me. You can get all the knowledge you need at Caltech. I believe we will cooperate very well."
The words also reveal expectations.
Now, von Karman has begun to look forward to the scene of Yu Hua coming to Caltech. The mathematical calculation ability possessed by Yu Hua is the most urgently needed in aerodynamics research.
"Thank you, Professor Carmen, this is the best thing I have received this year." Yu Hua stood up, with a look of respect on his face, bent down and took the individually marked business card with both hands, and put it away carefully.
"Looking forward to our next meeting, Yu." Seeing Yu Hua attaching so much importance to his business card, Fon Karmen felt even more satisfied, nodding and smiling.
Yu Hua nodded, straightened his back, bowed to von Kármán and saluted with the Chinese etiquette for a gentleman: "Students will not disturb you."
After saying this, he left the house with respect.
It was already rare that Fon Karmen gave him fifteen minutes to meet him. Now that he had received Fon Karmen's personal business card, which was like a letter of recommendation, Yu Hua was already satisfied.
"Professor Carmen, is this Chinese student excellent? Why do you call him a super genius?" After Yu Hua left, Colonel George, who had never spoken during the conversation between the two, asked.
Although he didn't say a word, he understood the meaning of the personal business card given by von Karman. This is something that countless American highly educated students dream of.
Regardless of whether they are college students, masters, or doctors, they are all equal in front of von Kármán's personal business card.
No one could refuse von Kármán's business card.
Von Karman smiled and made a simple metaphor: "His mathematical ability is more than a thousand of you can match him. One day when he comes to the United States, you will understand Yu's ability."
"Okay... Professor Carmen, according to your schedule, you will go to the Peking Hotel for a dinner tomorrow and leave for Nanchang on June 20th. General Zhou Zhirou, commander of the Chinese Air Force, will be waiting for you there to inspect the large-scale wind tunnel project in Nanchang.
"Colonel George shrugged when he heard this. He had no idea about mathematics and didn't care how strong Yu Hua's mathematical ability was.
No matter how strong your mathematical skills are, it is impossible to make this country strong.
Hearing this, Von Karmen nodded slightly and motioned to Colonel George to deal with the scratch paper on the coffee table, then stood up and walked to the bedroom, ready to rest.
…
Time passed quietly, and day by day, the excitement of Fon Karmen's visit to Tsinghua University gradually subsided, and the school returned to its former quiet and peaceful state. Yu Hua, who had received Fon Karmen's business card, did not give up and was not complacent, but continued to work hard.
Whether it is Fon Kármán’s business card or Zhao Zhongyao’s letter of recommendation, if you want to use these two things, you must get a place for a government-funded student studying in the United States with the Geng Geng Grant.
Moreover, even if you are admitted as a government-sponsored student studying in the United States under the Geng Geng Scholarship Program, you have nothing to be proud of.
There are many people in history who are better than me.
A week later, the time came to late June, and Yu Hua finally completed the 600,000-word epic masterpiece - Introduction to Military and Civilian Guidance before the Marco Polo Bridge Incident broke out. This masterpiece condensed countless wisdom and contained important information for the base area.
vital science and technology.
After completing the introduction to military and civilian guidance, Yu Hua did not rush to send it to Lin Wan through Zhang San's identity. Instead, he planned to wait until the German mechanical processing equipment arrived at Tianjin Wei and hand it over to the organization with the help of Lin Wan.
After writing this book, Yu Hua can finally concentrate on studying, improve his academic level in nuclear physics and mechanical engineering, supplement relevant knowledge in the field of metallurgy, and continuously improve his knowledge reserve.
As the academic level of mechanical engineering continues to improve, Yu Hua has gradually touched the theoretical threshold of oxygen blowing furnace technology and began to conduct preliminary research work.
Among the many core technologies of oxygen blowing furnaces, the oxygen lance ranks first. The structure and design of the oxygen lance are extremely important. Secondly, the air separation equipment technology and compressor technology for oxygen supply must also be solved.
The technical content of oxygen lances, air separation equipment, and compressors is by no means comparable to that of Qiming Lamp and Yu's Seven Towers. There is no shortcut to develop these cutting-edge technologies for use in the steel industry.
Scientific research is by no means a matter of words. Today we talk about building an oxygen blowing furnace, tomorrow we complete the design, and the day after tomorrow we start manufacturing and smelting.
Yu Hua was conducting pre-technical research on the oxygen blowing furnace and learning knowledge at the same time. His daily life tended to be fixed, library-classroom-nuclear physics laboratory, the standard three points and one line, and he had no idea of finding a female classmate to fall in love with.
.
For Professor Zhao Zhongyao, since Yu Hua became his assistant, almost everything has been developing for the better. Nuclear physics experiments have made rapid progress. Experimental data can be calculated and processed in a short time, and the efficiency is almost ten times more than before.
This situation made Zhao Zhongyao smile almost from ear to ear. While conducting nuclear physics experiments, he taught Yu Hua step by step.
As for Professor Zhuang Qianding of the Department of Mechanical Engineering, to be honest, except for meeting him once in the auditorium that day, Yu Hua had never seen him again.
As the time gets closer to the end of June, on the eve of the Marco Polo Bridge Incident, the city of Peiping is still stable, and all students in Tsinghua University are about to face the final exam of 1937.
"Yu Hua, come here." In the school classroom, Yu Hua had just left the school after class when a voice suddenly came from behind.
"Professor Zhuang, what are you?" Yu Hua turned around and took a closer look. The person coming was Professor Zhuang Qianding. His eyes were reddish, his face was haggard, and his mental state was very poor. Yu Hua was startled by this look.
Darling, what's going on with Professor Zhuang?
"Go to the office and talk." Zhuang Qianding said to Yu Hua with joy in his eyes, then turned and walked to the office.
Yu Hua nodded, followed the footsteps, and came to the classroom office together.
"These are the three previous papers. They have been written. Please sign your name as the second author." Entering the office, Zhuang Qianding sat in his seat, took out three papers and pens and placed them on the table.
On the desktop, he said to Yu Hua.
The words are full of relaxation and comfort.
Yu Hua immediately understood the situation, nodded, picked up the pen and wrote his name at the end of the three papers: "Uh... OK, Professor Zhuang, have you been writing papers during this time?"
"How is it possible? During this time, I was developing a vertical drilling machine. What you said earlier reminded me that just because the Americans don't sell it to us, it doesn't mean we can't be self-reliant. Do you want to go to the laboratory to see my latest vertical drilling machine?
"Professor Zhuang shook his head, how could it take him so long just to write the thesis? He glanced at Yu Hua and smiled.
In more than ten days, you built a new vertical drilling machine...
Yu Hua was impressed by Professor Zhuang's top-notch research and development capabilities and hands-on ability, and expressed his admiration. No wonder Professor Zhuang looked like he hadn't slept well in a long time.