"No, Balazs Barani published a paper titled "Hausdorff dimension of nar self-affis and measures" on arxiv two days ago.

His article studied the sawtooth function that becomes linear after derivation, and dealt with linear problems."

Zhao Xiancai said.

"Linear problem? General periodic analytic functions solve nonlinear problems."

After hearing what Zhao Xiancai said, Zheng Xiaowei took out his mobile phone and started searching for the article Zhao Xiancai said.

"This was uploaded to arxiv just the day before yesterday. You finished reading it so quickly?"

After searching for the article Zhao Xiancai mentioned and seeing the upload date, Zheng Xiaowei looked surprised.

He had never heard that Zhao Xiancai specialized in this field before?

Why did Zhao Xiancai read a paper on Hausdorff dimensions that a Hungarian mathematician uploaded on arxiv two days ago so quickly?

“When I traveled around the world to visit mathematicians, I went to Hungary to meet Bárány and chat with him.

Some of the points he made in this article were discussed when I chatted with him.

When Bárány was preparing to upload this article to arxiv, he contacted me specifically and wanted to add my name to the author name, but I refused."

Zhao Xiancai explained.

After hearing Zhao Xiancai's explanation, Zheng Xiaowei nodded and read the article he just found.

"This article does study the sawtooth function that becomes linear after derivation, and deals with linear problems.

You mean, I can replace the cosine function with a general periodic analytic function to study the dimensionality of Weierstrass-type functions?"

After a while, after reading the abstract of bárány's article, scanning the table of contents, and carefully thinking about what Zhao Xiancai just said, Zheng Xiaowei asked Zhao Xiancai with a slightly excited expression.

"Yes, the dimensionality issue of Weierstrass-type functions is closely connected with the study of fractal geometry. It belongs to a dynamic system in two-dimensional space and is a continuation of the study of dynamic systems..."

Zhao Xiancai began to talk to Zheng Xiaowei about Weierstrass type functions.

…

"Professor Zhao is worthy of being the person who solved Goldbach's conjecture. I have benefited a lot from my conversation with you today. I look forward to our next meeting."

After the discussion on mathematics was almost over, Zheng Xiaowei said to Zhao Xiancai with admiration.

"At the opening ceremony of the conference, when you came on stage as a guest to give a speech, one of our professors from Shuangdan University said some not-so-good things in the audience.

At that time, I was just a bystander and didn't say much. Now I am here to apologize to you for my behavior at that time and the behavior of the professor."

Zheng Xiaowei said to Zhao Xiancai again.

As for what Yan Chengsheng of Shuangdan University said in the audience before, Zhao Xiancai had already heard Yang Gang say it to him when he stepped down. Anyway, they didn't say these words in front of him, and they didn't actually say anything.

If it was too outrageous, Zhao Xiancai never took it to heart.

This time Zheng Xiaowei also apologized specifically, which made Zhao Xiancai a little flattered.

"No, no, no need for you to apologize for such a trivial matter, not to mention those words were not said by you."

Zhao Xiancai quickly said to Zheng Xiaowei.

After attending the seminar this afternoon and having dinner, Zhao Xiancai was leaving the capital the next day.

"What I said to you before was serious, please think about it carefully.

Judging from your current achievements and the attitude of those academicians towards you, I think it is quite promising to apply in one or two years after you come back.

And now we are advocating younger academicians, you are young enough."

On the 24th, Yang Gang said to Zhao Xiancai on the way to the airport.

"Nowadays, academicians are encouraged to be younger, but am I too young?"

Regarding what Yang Gang said, Zhao Xiancai naturally knew what he was referring to.

What Yang Gang is most concerned about now is naturally Zhao Xiancai's application for academicianship of the Academy of Mathematics and Systems Science of the Chinese Academy of Sciences after Zhao Xiancai returns to the capital and takes up a position at Beijing University.

The rejuvenation of academicians he mentioned is a new change in the selection rules for academicians of the two academies in 2015, including the cancellation of departmental selection, the prohibition of cadres at department level and above becoming candidates, and the rejuvenation of academicians.

"Okay, I will seriously consider it."

Although Zhao Xiancai complained in his heart that he was still too young, he still knew how to answer Yang Gang.

"Well, when you come back, the school may not be able to give you as high an annual salary as you did at Princeton, but in other aspects we will definitely give you as much as you want."

Yang Gang said to Zhao Xiancai again.

On the way to the airport, Yang Gang said this to Zhao Xiancai.

Zhao Xiancai's current salary at Princeton is an annual salary of one million US dollars.

If calculated based on this year's exchange rate between China and the United States, this one million U.S. dollars would be equivalent to more than 6 million soft sister coins.

With an annual salary of more than 6 million soft girl coins, even if Zhao Xiancai is a double winner of the Fields Medal and the Nobel Prize, I'm afraid it won't be enough.

After all, this more than six million is just an annual salary.

However, Beijing University can obtain other things for Zhao Xiancai, such as a house in Beijing University, scientific research funds, bonuses, subsidies, etc.

…

After returning to Princeton University, Zhao Xiancai resumed his previous life. In addition to processing data related to Professor Liu Yuelin's research on the aging of perovskite solar cells every day, he also dealt with some questions asked by his two graduate students.

.

The other time is spent attending classes and continuing to read physics materials.

With the participation of Zhao Xiancai, Professor Liu Yuelin's team studying the aging problem of perovskite solar cells has developed rapidly.

When the time came in December, their research had already produced some significant results.

"After everyone's research day and night during this period, we finally have some results. Now let me talk about our results.

For all-inorganic color lead triiodide (cspbi3) solar cells, the capping layer stabilizes the interface between cs2pbi2cl2 and cspbi3, while increasing the power conversion efficiency of the all-inorganic color lead halide perovskite from 14.9% to 17.4%.

.

Additionally, devices with this 2D capping layer do not degrade at 35°C, and accelerated testing at various temperatures up to 110°C and approximately 65% ​​relative humidity revealed an Arrhenius temperature-dependent efficiency

decline.

The degradation acceleration factor based on the observed Arrhenius temperature dependence therefore predicts an intrinsic lifetime of ±7000 hours (>5 years) for continuous operation at 35°C..."

The person who summarized the experimental results during this period was not Liu Yuelin, but Zhou Xianming.

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