Xueba's Sea of ​​Stars

Chapter 305 Inheritance
But before Wu Bin answered, Academician Chen Xianhui said directly: "This means that what you get is only a picture drawn with computer software, and the specific relationship between it and physics requires you to think carefully."

"Don't take the output of the instrument as physics. If you do experimental physics like this, you will be in trouble in the future."

After hearing this, Wu Bin said thoughtfully: "Professor, do you mean to use physical thinking to think about things?"

"That's right, that's what it means. The original purpose of experiments and machines is to facilitate our better understanding of the world, but now more and more people are relying too much on the data from machine tests."

"Take temperature as an example. Temperature is measured by a thermometer, and the measurement principle of all thermometers is to measure a physical quantity, and then convert it into A value, and that value is called temperature."

"However, when doing experiments, quite a few people only look at the value in the column of "temperature" given by their instruments, instead of understanding what temperature is, and finally suffered a considerable loss. Many temperature-related That's how bad physics comes about."

"A dumbfounding thing happened in our Institute of Physics. You should know that crystal growth is a very important direction. It can be said that the most important thing in studying condensed matter physics is to obtain substances with certain physical properties. , this substance may no longer be a naturally occurring substance, but needs to be obtained through our efforts."

Wu Bin couldn't help but nodded.

For him who has studied materials science for a long time, the number of times he has to deal with crystals can be said to be quite frequent.

Seeing Wu Bin nodding with deep emotion, Chen Jinhui said with a smile: "It seems that you should understand that crystal growth is a very difficult and very comprehensive subject, and one of the key factors is temperature control. Where do we get the temperature?" , Why is the data measured by that instrument called temperature, and what false signals this instrument may cause will affect our research.”

"There used to be a period of time when all of our crystal growth equipment seemed to have some kind of failure, and the bismuth crystals in it couldn't grow well, but after checking by the experimenters, they found that all conditions were well controlled, and finally tossed It took everyone in a laboratory half a year to find out the reason, guess what it is?"

"This one……"

Since Academician Chen Xianhui emphasized the words dumbfounding before, it should not be a problem with the normal machine, so Wu Bin thought for a while and guessed: "Is it because of a wrong operation in the temperature field control?"

"It's very close." Academician Chen Xianhui nodded, "Finally they found out that it was because the stray cats in the yard had pulled the thermocouple that measured the temperature and moved it."

"That's okay too?" Wu Bin couldn't help being stunned after hearing this.

"Yeah, the person involved also felt very broken. They never dreamed that it would be the reason. But this incident proved what I said earlier. When working in the laboratory, don't think that those instruments are A black box, it says this is an image of an atom and you think it is an image of an atom, it says it is a temperature and you think it is a temperature, that is not the understanding that a physicist should have.”

"The correct attitude for doing experiments is that you must try to make the instrument you use transparent to you. A set of instruments is in front of you, from its physical principles to its electronic structure to the whole process of its work. A physical process, until its theoretical explanation should be transparent to you, is called an experiment.”

'Transparency...data...'

When he heard these two words, a white light seemed to flash in Wu Bin's mind, and a sense of connection stronger than when he watched the full moon suddenly appeared in his mind.

"So, the instruments are just auxiliary, and people..."

Halfway through the speech, Academician Chen Xianhui realized Wu Bin's pensive expression.

'This little guy, the way he enters samadhi is quite similar to mine. '

After a while, Wu Bin, who came back to his senses, looked at Academician Chen Xianhui who was smiling in front of him, and said quickly, "Sorry, professor, what you said just now was very enlightening to me, and I was fascinated."

"Oh? Did you come up with anything?" Academician Chen Xianhui asked happily.

"Yes, in fact, I thought about using the strong adhesion and large contact area between aluminum oxide and two-dimensional iron germanium tellurium to prepare graphene monolayer samples, but I have been struggling with adjustable gate voltage and temperature. On the bottleneck, I actually had some inspiration to solve this problem two days ago, and what I taught you today has benefited me a lot, thank you very much for your teaching."

Academician Chen Xianhui laughed after listening, "If every time I talk, I can make a student's inspiration explode, then I will die of joy, but I also feel very happy that you can benefit from this speech so quickly. Happy."

"Do you really want to go to the laboratory to practice now?"

After hearing this, Wu Bin shook his head quickly: "No, I still want to chat with you more. I think I can learn a lot from you that books and literature cannot teach me."

"I like to hear that." Academician Chen Xianhui took a sip of hot tea happily, "But in fact, what I can teach you is just my experience summed up from countless documents. I believe how much knowledge is passed down in the documents. You know that too."

"In 1824, Carnot established the first French article on thermodynamics. You will find that Carnot's principle is the most basic sentence 'any heat conduction that is not for the purpose of doing work is a waste', this sentence is the most fundamental of thermodynamics principle.

"Ten years after this principle was born, it was understood by Claperon in 1834, and he drew the cycle of Carnot's ideal heat engine, and at the end of this article, he casually said, 'If for For any heat engine, if the heat conduction not for the purpose of doing work is a waste, then the biggest waste of the pot that is boiling water on the stove is not in the pot, but at the junction of the stove and the kettle.'

"And such a sentence was finally read by an engineer Diesel after waiting for about 50 years. If the biggest waste is on the interface between the stove and the stove, then a good heat engine should not put the stove on the stove. Instead, the stove should be built into the stove.”

"Then we have the internal combustion engine in the world."

"These people are real gold diggers. What they find is the most important thing to learn in physics. This is the inheritance of knowledge. I also hope that you can become the next person who digs gold, or become the one who transfers knowledge. The one who passed on."

"The students are taught." Wu Bin nodded respectfully.

PS: February is so short, it’s not suitable for me who can only explode at the end of the month (sigh)
(End of this chapter)