As soon as Xiao Yi's words came out, Luo Mingya, who was about to go about his own business, and Zhao Yuanyuan next to him were stunned.
You only looked at it for a while and you came to the conclusion that Fourier Transform should be used?
Although it's all about mathematics, this data is also from their material major, right?
Can you understand?
Luo Mingya stopped his feet and turned his head to look over. "What's the reason?"
Xiao Yi pointed to the curve and said, "You see, the stress-strain curve of each sample contains many oscillations and fluctuations, and the curve of the abnormal sample shows different behavior from other samples."
"So we can easily think of using Fourier Transform for processing."
"After all, anyone who has studied Fourier Transform should know that for this kind of curve oscillation, it is best to use Fourier Transform to deal with it."
"Hmm... but there is too much data. It would be better to use a computer to process it."
Hearing Xiao Yi's words, Zhao Yuanyuan looked confused.
ah?
Is there any?
Is the curve of the abnormal sample so different from the curves of other samples?
Why didn't she see it?
And Luo Mingya came up to take a look. After thinking for a moment, he said, "Indeed, there is indeed an obvious difference."
She had never seen this data before. After Zhao Yuanyuan gave the data to her, she had not taken the time to look at it.
She glanced at Zhao Yuanyuan and said, "Didn't this guy notice it?"
Zhao Yuanyuan looked confused.
What?
Should I find out?
She whispered, "No, senior sister, I feel that from the curve point of view, these lines are almost the same... at most, at most..."
"Okay, you don't have to worry about it anymore, just watch and study hard."
Luo Mingya shook his head, forget it, I won't explain it to the rookie.
Xiao Yi took another look at the curve and then said, "We first convert these data into signals in the time domain. In this way, these data should represent the mechanical response of the metal under different strain conditions."
"However, it's not enough to have signals in the time domain, we also need to convert them into the frequency domain."
"This requires computer help. I can't handle it alone."
Xiao Yi said with a shrug.
After all, there is too much data, so using a computer is obviously more worry-free and labor-saving.
"The computer is in the computer room next door, let's go now." Luo Mingya acted resolutely and walked directly in front to lead the way.
Zhao Yuanyuan quickly followed.
Of course, Xiao Yi also followed.
However, what happened here also attracted the attention of others in the laboratory. Xu Ming, Liu Chao, and another boy named Wen Xiping. They looked at each other and quickly followed.
When we came to the computer room, there was a server here. After Xiao Yi saw it, he couldn't help but ask, "Don't you have a server here? Why do you want to rent mine?"
Luo Mingya said, "This server was made several years ago, and it was only worth 700,000 at the time. You have to queue up to use it, not to mention that the project we are going to do takes a long time. This is an old antique, and even a dog doesn't need it."
Xiao Yi: "Uh..."
Zhao Yuanyuan whispered, "Sister, we seem to be using it now..."
Luo Mingya hummed. "I use it to give it face. What's more, the topic now is yours, so it means you are using it."
Zhao Yuanyuan could only shut up angrily. If she continued talking, her citizenship would be lost.
Turn on the computer and connect to the server. Then Luo Mingya called up the data and began to convert the data from the time domain into the frequency domain as Xiao Yi said before. This is the spectrogram.
Xiao Yi looked at these curves carefully, pointed to a part of the curve representing the abnormal sample, and said, "Obviously there is a very obvious oscillation peak of a specific frequency in this part."
Immediately afterwards, Luo Mingya also stretched out his hand, pointed at the curve of the normal sample and said, "The vibration peaks of these normal samples are different from the abnormal samples, especially at this type of frequency."
The words of the two people rang out one after another. Luo Mingya raised his eyebrows and glanced at Xiao Yi.
If you are good at mathematics, can you do this?
Actually faster than her reaction?
The other people watching were even more stunned.
The conclusion reached by these two eldest brothers and eldest sisters is already beyond their comprehension.
Can you really tell something from the data chart above?
Are you kidding me?
Of course, putting this aside, what shocked them even more was that Xiao Yi actually reached the conclusion before their senior sister?
Although it was only a second or two ahead of schedule...
However, this was beyond their imagination.
Their invincible senior sister is actually slightly inferior?!
Xiao Yi Can you figure these things out with just your mathematical ability?
They were starting to get a little numb.
"Then what do you think these things should represent?"
Not knowing what the rookies behind him were thinking in their heads, Luo Mingya asked Xiao Yi with interest.
No matter how good you are at mathematics, you can't possibly answer all of this question, right?
Of course, Xiao Yi really couldn't give an accurate answer. However, with some possible ideas, he thought for a while and said, "It should mean that the internal units of this abnormal sample are different? Hmm... I have heard that there is something called a crystal lattice in the unit of materials. Maybe it is related to this?"
As soon as Xiao Yi said the word "crystal lattice", Luo Mingya finally showed surprise in his eyes.
After taking a deep look at the math genius, she said, "You have already guessed it. My inference is that these abnormal peaks may be related to lattice defects or dislocations in the metal alloy."
Xiao Yi's eyes lit up. "It seems that I really guessed it right."
Luo Mingya didn't say much. He turned to the juniors and juniors behind him and said, "I hope this case can give you a little more experience. It's this kind of curve. We obviously have to use Fourier Transform and spectrum analysis to study it."
"Especially Zhao Yuanyuan, this data is already very obvious. If you don't see it, it means you haven't practiced enough. I will find five more papers for you to read later."
Zhao Yuanyuan: "Huh?"
"The next step is to further study using materials microscopy and X-ray diffraction experiment."
"Let's all go back to the lab and work."
Under the command of Luo Mingya, no matter how much Zhao Yuanyuan wanted to cry, he could only quickly return to the laboratory and start research.
Xiao Yi doesn't know how to use it, so he just watches them use it.
Xu Ming and Liu Chao were also idle. They stood aside, glanced at Xiao Yi, and then asked, "Well...Brother Xiao, how did you see it just now?"
"That's how you can tell." Xiao Yi said, "Maybe... looking for differences?"
God can't help but notice the difference!
(╯‵□′)╯┻━┻
Xu Ming and Liu Chao looked embarrassed.
Liu Chao asked again, "Then... how did you come up with the idea of crystal lattice? Have you really never studied materials?"
Xiao Yi said, "I really haven't learned it. As I said just now, I only heard about the concept of crystal lattice by chance, so I just remembered it. As for why I can guess... In a uh, more distorted way, it can be understood as calculus. The entire metal block is continuously divided into the smallest units, and the abnormal peak value is almost equivalent to an abnormality in one of the smallest units in calculus. Well, it is naturally connected to the crystal lattice."
Xu Ming, Liu Chao: "..."
Is this a master-level mathematical thinking?
Xu Ming thought for a moment, then suddenly his eyes lit up and he said, "Well Brother Xiao, I recently saw a question on the Internet, proving that the cube of π is greater than 31. If Brother Xiao could do it for you..."
Before he could finish speaking, Xiao Yi replied, "It can be easily observed that the cube of 3.1415 is approximately equal to 31.0035, which is greater than 31."
The two of them were startled. Can this be observed?
3.1415 times 3.1415 times 3.1415...
What a joke!
"Brother, please try another method. We can't do this mental arithmetic."
"Well..." Xiao Yi said, "That's okay."
Then he took out a small notebook and pen from his pocket, and wrote on it:
"Well, that's it."
Xiao Yi After writing the calculation, he tore off the paper and handed it to them.
After reading it, Xu Ming and Liu Chao fell silent.
They found that they should not be idle and came to Xiao Yi to do this kind of question.
Isn't this just looking for trouble?
"I said you can do it. If you ask Scholar Xiao to solve this kind of problem, am I looking down on Scholar Xiao?"
At this time, Zhao Yuanyuan came bounding over. Her expression was very happy. "Senior Sister has come to a conclusion. It is basically certain that it is a lattice defect problem."
"The senior sister also said that as long as we conduct further research on this issue and come up with some understanding of the mechanical behavior of metals, or optimize and improve the plan, maybe we can publish a zone by then!"
"Thank you Scholar Xiao! You have helped me a lot!"
Zhao Yuanyuan is directly bowing 90 degrees towards Xiao Yi.
Xiao Yi quickly waved his hand. "You're welcome, I just provided some help with mathematics. The most important thing is that your senior sister saw the problem."
"Then you discovered the problem first!" Zhao Yuanyuan looked at Xiao Yi with admiration. "No matter what, I'll treat you to milk tea, and I'll treat you to a meal next time!"
"Ah, there's no need to eat." Xiao Yi waved his hand. "Milk tea is fine."
"Then, okay!" Zhao Yuanyuan had no choice but to nod, and then she took out her phone and started ordering milk tea.
"Yo? Where's ours?" Xu Ming next to him winked and said, "After all, we have been classmates for such a long time. We still entered in one year."
Zhao Yuanyuan glared at him. "Have you ever helped me?! Get out of here!"
"It's broken, Junior Brother Liu, we have become outsiders, you, Senior Sister Yuanyuan..."
"Pia!"
A slap came from behind Xu Ming's head.
"What are you talking about here?" Luo Mingya took a photo of Xu Ming aside.
Xu Ming covered his head, widened his eyes, and looked at their senior sister with anger and speechlessness.
Liu Chao next to him hurriedly hid aside, saying that it had nothing to do with him.
Luo Mingya clapped his hands, then looked at Xiao Yi and said, "Junior Brother Xiao, it seems that with your ability, you can officially enter our project now."
"The purpose of our project is to use Density Functional Theory and first-principles calculations to study the properties of defects in two-dimensional materials."
"If there's no problem, just post an NM or something, it won't be a big problem."