Chapter 288 Do you have a problem that will kill you if you don’t make others suffer?
This year is different from previous years. The Mid-Autumn Festival falls on Saturday and Sunday, so Xu Qingzhou and Song Yao are basically at home.
Monday, the 28th.
Song Yao went to see Professor Li Daiyue to discuss the application for exemption from classes, while Xu Qingzhou stayed at home to perfect the experimental model of Professor Zhao Shengwen and his team.
After so much accumulation, there is now a complete multi-physics coupling model that can effectively describe the interaction between multiple physical fields such as electrochemistry, thermal and mechanics.
When Xu Qingzhou opened the folder, he discovered that during the month he was in Switzerland, Professor Zhao and his colleagues had made some new attempts.
For example, porous silicon nanomaterials were prepared using coal-based kaolin by chemical etching followed by magnesium thermal reduction in an Ar atmosphere.
"It works well."
Looking at the data chart, Xu Qingzhou nodded.
这种材料拥有 ·g^-1的首次放电容量和 ·g^-1的充电容量，在100mA·g^-1的条件下，100次循环后仍提供 546mAh·g^-1的可逆比容量。
Although the battery has high performance, its disadvantages are also obvious. The preparation process is complicated and it is unlikely to be mass-produced.
In addition to this, the research team also prepared nanoporous silicon materials by chemically etching commercial Al-Si alloys with alkali.
初始容量高达3003mAh·g^-1， 300次仍保持1000mAh·g^-1的容量.
In actual applications, a layer of carbon is basically coated on the silicon material to improve its electrical conductivity, while also increasing the material spacing and improving its electrochemical performance.
Xu Qingzhou watched with great interest.
I used to hear people say: "The value of a graduate student does not lie in how much knowledge you have learned, but in how much knowledge you have created. No matter how much you have learned, at best you are a library, and the outside world's evaluation of you will only be based on your work."
Xu Qingzhou quite agreed.
However, the accumulation of knowledge is equally important.
I don’t have time to do the experiment myself now, so I can only look at some information and accumulate some experience. After all, batteries will be a research hotspot for quite some time in the future.
There is also experimental data related to lithium dendrites.
Various graphic data, including the relationship between the net change in the length of the Li dendrite in the crack and the capacity during a fixed charge and discharge cycle, and the relationship between voltage and time.
【Li/Li7 at a current density of 2 mA and a capacity of 2 mAh cm-6 at a stacking pressure of 5 MPa】
Xu Qingzhou’s current job is not particularly difficult. It is to use the latest data to iterate the model.
Data is more real than human feelings. Through data, we can understand the internal structure of new samples so as to better adjust parameters and determine better material ratios.
Xu Qingzhou went through all the information first before importing the data into the model.
Song Yao took the printed application form to see Professor Li.
In the office, Li Daiyue took a look at the application form and found no problem, then handed Song Yao a USB drive.
"On the 8th of next month, Professor Dong Yixuan from Nanjing University will lead a team to come for exchanges. Here are the meeting materials. Please familiarize yourself with them."
"it is good."
Song Yao looked at the materials, and Li Daiyue stood up and took the application form to go through the process.
In fact, Song Yao could go and submit the application form by herself, but it would be better for her to go by herself, as it would save her a lot of trouble.
"Director Cao."
"Professor Li."
In the office, only Cao Jingyu, the head of the Economics Department, was present.
As soon as Cao Jingyu met him, he smiled and asked, "I heard that you want to take Song Yao from our department as your student?"
"Well, this little girl is very talented." Li Daiyue nodded.
Cao Jingyu chuckled and said, "I've seen this girl's grades and test papers. They are indeed very good. Is she dating Xu Qingzhou from the School of Mathematics?"
"You know that too?" Li Daiyue asked in confusion.
"Everyone is talking about it, it's hard not to know. Moreover, at the last meeting, when I met Mr. Gu from the School of Mathematics, he joked with me that our School of Economics is the mother's family."
Li Daiyue discovered that apart from her, the whole world knew about the affair between her future apprentice and Xu Qingzhou.
At first, I was worried that my prospective apprentice would be affected in his studies by his partner, but now it seems the situation has reversed?
No, Xu Qingzhou is very powerful, and her future apprentice will not be weaker than others.
This little girl is amazing.
"Have these two young people been dating since high school?"
"They were in the same class in high school, probably around that time."
Li Daiyue frowned and suddenly realized that she seemed to have been led into a ditch of gossip. "This is Song Yao's application for exemption from class."
"Application for exemption from class?"
"Well, I've tested it myself, and this girl's level is at least that of a senior."
"This"
Cao Jingyu looked at the application form, thought for a moment, and said, "It seems that you really value this student. You even went to submit the application form in person. Well, she must be very capable to pass your test. Besides, her performance is obvious to all. This is not a problem."
9 month 30 number.
The day before the National Day holiday, Xu Qingzhou sent the battery analysis results to Professor Zhao. For example, in the samples of group D, phenolic resin and graphene oxide were added in sequence to prepare the precursor gel, and then the precursor was obtained by freeze drying and high-temperature carbonization.
The silicon-carbon composite material prepared according to this step has the best effect.
根据模型推测，首次放电容量达可以到 2455mAh·g-1，同时，在 、、 1679mAh·g-1、1285mAh·g-1
Of course, the model can only simulate based on the data and form a guess. The specific details still need to be verified by Professor Zhao and Senior Brother Wang Wei themselves.
Song Yao's application for exemption from classes was successfully approved, so she no longer had to go to class, but she was busier than before.
Li Daiyue gave Song Yao a reading list and asked her to hurry up and finish reading all the books on it.
The holidays for research groups in universities are shortened, and sometimes even eliminated altogether. Fortunately, Professor Li Daiyue still gave the department a three-day holiday.
The two of them didn't plan to go out and play during the National Day holiday.
Neither Xu Qingzhou nor Song Xiaohua are the kind of people who like to join in the fun, especially during such a long holiday when every place is crowded. Going out is more like counting heads than going out to have fun.
Might as well just stay at home and lie down.
Xu Qingzhou helped Song Yao register a LOL account so that she and her sister Ding Jiahui could play together - a pair of rookies fighting each other.
So, the first day of the holiday was spent in a bad mood.
November 10, 2 .
It rained last night and it is a sunny day today. The golden sunlight shines in from the floor-to-ceiling windows and sprinkles on a corner of the desk.
The desk was covered with sheets of manuscript paper filled with mathematical formulas.
Xu Qingzhou lowered his head, tapped his pen tip, and went over all the calculations in his mind, hoping to find a loophole.
【When Ap={n∈A:p|n} and P={p:p≤z}, S(A,P)=π(x,z) S(A,P2)=π2(x,z)】
【This means that when n≤Pz, we have:π2(Pz)=Pz2∏3≤p≤z(12p), and there exists a constant M. 】
Ermao yawned and wandered around the living room. He rubbed against Xu Qingzhou's trouser legs a few times, but when he saw that the two-legged beast ignored him, he walked away alone.
The automatic feeder is empty, there is no food.
Cat life is hard!
"Whoo~"
Xu Qingzhou rubbed his temples and planned to rest for a few minutes.
Seeing Er Miao squatting in front of the feeder with eager eyes, he smiled and stood up.
Since using the feeding machine and reducing the food, Er Miao has indeed become a little thinner than before. Although he still looks chubby, it would be best if he could lose weight. Animals are just like humans. Being fat is not good for their health.
"If you want to eat, just let me know." Xu Qingzhou hooked Ermao's chin.
"Meow~"
Ermao was very cooperative.
"Meow~Meow~" It was not until the second cat called twice that he pressed the switch and put a small handful of cat food for the greedy cat, fearing that it would disturb Song Yao who had not yet woken up.
Seeing Er Miao enjoying his breakfast, Xu Qingzhou took a cup of hot water, stood by the window, breathing fresh air, and thinking about what to do next.
I will be able to finish my graduation thesis and defend it by the end of this month. As for my supervisor, he now prefers Academician Chu Jiangfeng.
Thinking about it, Xu Qingzhou glanced at the manuscript on the table. The only troublesome one was the Polignac conjecture.
Last time I was still sighing that the proof process was very smooth and I felt like it was done in one go, but on the first day of October I was hit hard and was stumped by the estimate of the index and the result.
The calculated results are totally wrong.
The value is outrageous, and there is currently no solution.
How should I put it, it’s just like a senior brother I met at the beginning.
This senior was working on an acoustic levitation project. After using boundary element method for calculation and finite element verification, he found that if designed properly, the instrument could float itself in the air and have a fairly high fault tolerance.
When my doctoral supervisor came over to check on me halfway through my study, he only had one thing to say: Very good. My suggestion is, why don't we stop this project and go straight to UFO research?
Xu Qingzhou is facing this problem now, and the calculated result can refute the index itself.
Last night, under the gaze of School Beauty Song, I went to bed at 12 o'clock.
At 6 o'clock in the morning, he got up again and continued calculating.
Doing calculations is sometimes really like doing something. If you don’t figure it out, you’ll feel uncomfortable.
Bah~
Even this can be thought of as bitter.
Cursing himself inwardly, Xu Qingzhou shook his head and let his thoughts run wild. Song Yao was still sleeping, and he planned to wait until she woke up before going out to buy breakfast.
At 8 o'clock, the community was already bustling.
Some old men and women were buying groceries, some were doing morning exercises, and some were taking a walk in the community. There were a lot of people, but only a few young faces.
At this point, everyone is probably sleeping.
"The old and the young."
After sighing, Xu Qingzhou turned back to the sofa and pulled out a stack of information from the armrest.
After a few minutes, I heard the sound of footsteps.
Song Yao was wrapped in pajamas, her hair was frizzy and drooped on her shoulders, and she came out of the bedroom with sleepy eyes.
"Why did you get up?" Xu Qingzhou put down the documents.
"I'm just having my period, I'm not pregnant, and I'm not disabled. I have to lie down all the time." Song Yao snorted.
Xu Qingzhou didn't argue. Girls, after all, have those few days every month when their moods fluctuate greatly.
Moreover, the girl who had spoken so powerfully and stubbornly just now had already thrown herself into his arms.
The two of them have been together for a long time and have seen each other's various sloppy looks. Song Yao no longer has the image of an idol like before and will tidy up her hair before leaving the bedroom.
After all, we were honest with each other.
Song Yao hugged Xu Qingzhou, closed her eyes and felt the warmth coming from under the boy's clothes, and inexplicably felt a sense of security.
Xu Qingzhou helped School Beauty Song to tidy up her hair, kissed her forehead and said, "Sit down and have a rest first. I'll go buy breakfast."
"I will go with you."
"it is good."
Xu Qingzhou smiled and nodded, it would be nice to go out for a walk.
15 minutes later, two young men appeared downstairs in the community.
In October, the scent of autumn becomes stronger, the leaves turn from green to yellow, the roads are covered with dead leaves, the air carries the fragrance of soil, and the puddles on the asphalt road reflect the blue sky.
During holidays, the vehicles and pedestrians on the road seem to be less busy, and everything seems quiet and peaceful.
The sunlight feels warm on people, not scorching at all.
Song Yao let Xu Qingzhou lead the way. She liked the feeling of just following without having to think about anything, especially at a time like this.
He just kept holding her hand and squeezing it.
With both feet and hands, this guy doesn't have any normal hobbies.
Song Yao complained in her heart.
On this side, Xu Qingzhou felt the delicacy of the little hand, and his index finger occasionally drew a circle in the palm of Song Xiaohua.
Song Yao's hands are very beautiful, with slender, white and tender fingers.
Of course, the most important thing is that Song Yao was a little different at this time. She was gentle and kind, making people want to tease her.
At the intersection, waiting for the red light.
Xu Qingzhou turned to look at the girl next to him.
In the sunlight, a few strands of hair on her temples sparkled. The sun shone sideways, and her long eyelashes left a few silhouettes on her clean face. She didn't wear any makeup today, and a broken beauty appeared on her pretty face.
Xu Qingzhou couldn't help but raise his hand and hook her chin.
Song Yao blinked but didn't move, as if she was thinking about how to beat up the guy who "tease" her.
The silly expression on School Beauty Song's face made Xu Qingzhou pinch her fair cheek again as if possessed by a ghost.
Song Yao still didn't say anything, just looked at him indifferently with an unfriendly look.
Xu Qingzhou was touched instead. At this moment, Song Yao's face no longer had the usual coldness. Even the threatening look in her eyes was sad and beautiful.
"There's something on your face." Xu Qingzhou stopped talking nonsense.
Song Yao's face was tense, and her teeth were itching: "Xu Qingzhou, do you have a problem that you will die if you don't torture others?"
"I can't help myself. School Beauty Song's delicate look is so rare. Sss~ I won't say anymore."
"Do you still want it now?" Song Yao asked with narrowed eyes, twisting her hands around her boyfriend's waist.
"Rare."
"."
Song Yao curled her lips and was too lazy to pay attention to this person. She planned to wait for a few days to pass before taking revenge.
At this moment, a familiar voice sounded behind the two of them.
"Xiao Xu, Xiao Song, you two, are you going out?"
"Aunt Jia."
Looking at the two people holding hands, Aunt Jia was stunned for a moment. How come after not seeing them for half a year, the state of these two children has completely changed.
Last time we met, Xiao Xu was absent-minded. This time it’s Xiao Song?
"you two"
Aunt Jia had a complicated expression on her face, thinking to herself that although this young couple seemed serious at ordinary times, they actually played very extravagantly.
"Aunt Jia, we have something else to do, so we'll leave first."
Xu Qingzhou found that Aunt Jia looked at them more and more strangely.
When the two of them were crossing the road, Aunt Jia and two other aunties had already met them.
"Is this the tenant of your house?"
"Quite young."
"Yes, that guy was on the news."
"Oh~ You bought the right house, the feng shui is good, look at your son, he is successful in his career"
The two turned a corner and walked to the street where there was a breakfast shop. Behind them, the voices of the aunties were drowned in the wind.
(End of this chapter)
