Scholar’s Starry Sea

But before Wu Bin could answer, 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 You need to think about it carefully."

"Don't take the output from the instrument as Physics. If you do this to experiment with Physics, it will be troublesome in the future."

Wu Bin said after listening to the looked thoughtful: "Professor, do you mean to use Physics to think about things?"

"Yes, that's what it means. Both experiments and machines have their original purpose. It’s for us to better understand this world, but now more and more people are relying too much on the data tested by the machine."

"Take temperature as an example. Temperature is measured by a thermometer. The measurement principle of all thermometers is to measure another Physics quantity, and then convert it into a value based on a theoretical formula or assumption that may be solid or not solid, and that value is called temperature. "

"But when a lot of people do experiments, they only look at the value in the "temperature" column given by their own instruments, instead of understanding what the temperature is. A big loss. Many bad Physics results related to temperature are produced in this way."

"One thing that made people didn’t know whether to cry or laugh once happened in our Physics. You should know that crystal growth is a very important direction. It can be said that the most important thing in the study of condensed matter Physics is to obtain a substance with a certain Physics property. This substance may no longer be a naturally occurring substance, but needs to pass Only through our hard work can we get it."

Wu Bin couldn't help but be nodded.

For him who has been studying materials science for a long time, the number of dealings with crystals can be said to be quite frequent.

Seeing Wu Bin’s deeply impressed nodded, Chen golden brilliance smiled and said: "It seems you should understand that crystal growth is a very difficult and very comprehensive subject, and there is a key factor in it. It is temperature control. Where do we get the temperature, what is the temperature measured by that instrument, and what false signals this instrument may cause will affect our research."

" All of our crystal-growing instruments seemed to have some sort of malfunction for a while, the bismuth crystals in it did not grow well, but after inspection by the experimenters, they found that various conditions were well controlled, and finally tossed an experiment. The room owner only found out the reason for half a year, guess what?"

"This..."

Before Academician Chen Xianhui emphasized that he didn't know whether to cry or laugh Four words, it shouldn't be a problem with the normal machine, so Wu Bin thought about it and guessed: "Did you make a mistake in the temperature field control?"

"It's very close. "Academician Chen Xianhui nodded, "Finally, they discovered that it was because the wild cats in the yard pulled the thermocouple that measures the temperature and moved it."

"Is this OK?" Wu Bin couldn't help but stunned.

"Yes, the parties also felt very broken, and they didn’t expect this in their dreams. But through this incident, it also proved what I said before, when working in the laboratory Don’t think that those instruments are all black boxes. If it says it’s an atomic image, you think it’s an atomic image. If it says it’s temperature, then you think it’s temperature. That’s not what a Physics scientist should have."

"The correct attitude to experiment 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 Physics principle to its electronic structure The whole Physics process to its work, to its theoretical explanation should be transparent to you, that is called an experiment."

'Transparent...Data...'

When Wu Bin heard these two words, there seemed to be a white light flashing in his mind, and a stronger sense of connection suddenly appeared in his mind than when he looked at the full moon before.

"So, the instrument is only an aid, and the human..."

In the middle of the speech, Academician Chen Xianhui realized Wu Bin's pensive expression.

'This little fellow, the way he enters Dharma is very similar to me. '

After a while, Wu Bin, who came back to his senses, looked at Academician Chen Xianhui who was smiling in front of him, and quickly said: "Sorry, Professor, what you said just now inspired me very much. Let me be fascinated. Now."

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

"Yes, I actually thought about using the strong adhesion between alumina and two-dimensional iron-germanium tellurium and the large contact area to prepare graphene single-layer samples, but it has been on the grid. I met bottleneck in terms of pressure adjustment and temperature. I actually had some inspiration to solve this problem two days ago, and what I taught you today has benefited me a lot. I really appreciate your teaching."

After listening to the laughed heartily, Academician Chen Xianhui said, "If I can make a student's inspiration burst every time I talk, then I would be happy to die, but you can benefit from this remark so quickly. I also feel very happy."

"Do you want to go to the laboratory to practice it?"

Wu Bin shook his head quickly after hearing this: "No, I still want to go with You talk more, I think you can learn from you many things that books and documents can't teach me."

"I like to hear these words." Academician Chen Xianhui elated his mouth warmly. Cha, "But in fact, what I can teach you is only the experience I have summed up from countless documents. I believe you know how much knowledge is contained in the inheritance."

"1824 When Carnot established the First Chapter French article on thermodynamics, you will find that the Carnot principle is the most basic sentence "any heat conduction that is not for the purpose of doing work is waste." This sentence is the most fundamental principle of thermodynamics.

"Ten years after the birth of this principle, it was understood by Claperon in 1834, and he drew the cycle of Carnot’s ideal heat engine, and he slapped a sentence at the end of this article. , Saying,'If heat conduction that is not for the purpose of doing work is wasted for any heat engine, then the biggest waste of the pot on the stove is not in the pot, but at the junction of the stove and the pot. Place. '

"It took about 50 years for such a sentence to be finally understood by an engineer Diesel. If the biggest waste is the interface between the stove and the stove, then a good heat engine is not The stove should be placed on the stove, and the stove should be built into the stove."

"Since then, our world has an internal combustion engine."

"These people are real The gold prospectors in Physics found what they should learn most in Physics. This is the inheritance of knowledge. I also hope that you can become the next person who digs for gold, or the person who inherits knowledge."

"Students are taught." Wu Bin nodded and said respectfully.

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