Chapter 840

In a super large classroom,

Yang Xiaoman is telling his own history of making a fortune and his case of liking foreign markets with finance. While Xu mang is sitting in a corner and dozing off in boredom. It is hard to imagine that there are so many students coming to listen to such an Airport woman.

Damn it...

I feel Xiaoman is more famous than himself. What's the situation? Shouldn't these people be more obsessed with themselves?

What is the situation?

Xu mang took out his mobile phone and took a picture of his face. He found that he was still so handsome, even more handsome than before. In the past, he was young and frivolous, and had a feeling of chasing after the wind. Now he is a bit more mature and stable, and I have to say... It's really handsome.

In boredom,

Xu mang took out a pen and a notepad from his bag and began to study the application of perovskite in solar energy. Of course, he couldn't do without his mobile phone. Some information could only be found on the Internet. Although a large amount of information was still reproduced in his brain, the database was constantly updated, and he was so lazy at ordinary times...

according to Xu Mang's serial structure, he started to study the application of perovskite in solar energy From the perspective of positive energy, the important characteristic of these materials is that the incident light makes its negatively charged electrons enter a higher energy state, leaving vacancies or holes, which act like positively charged particles.

If these charged electrons and holes can avoid recombination and reach the electrodes above and below the perovskite film for a long enough time, the current can flow.

In theory,

however, there are many problems, such as the lack of strength to produce large-scale and high-efficiency battery grids. The problem is that it is more difficult to produce uniform coatings on larger sizes. However, Xu mang proposes to use transparent electrode films to collect current.

It turns out that they can't either. These film electrodes allow a lot of light to pass through, but they also have a slight resistance, which can block some current. In larger sizes, this kind of resistance can cause more serious problems, and it can't expand the area and improve the conversion rate like the silicon panel.

Xu simply calculated that the efficiency of a 6.25 square centimeter perovskite battery is 20 percent, but when 35 grids are combined into a 412 square centimeter module, the ratio drops to 12 percent.

But...

nevertheless, perovskite batteries are easier to produce and cheaper than silicon batteries. Xu mang has investigated the process of silicon production, which requires heating at 1800 ℃ and dissolving the materials in hydrochloric acid of 3 Baidu when preparing high-purity slabs.

In contrast,

perovskite batteries require only a small amount of material deposited on the plastic film by an inkjet printer.

"Alas..."

"how annoying!" Xu sighed blankly. If it wasn't for his wife, zaote tore up these contents. It's not easy to be a man, and it's not easy to be a man.

What to do?

What else can I do? Who let himself marry such a woman.

First of all, the conversion rate of perovskite battery is put aside, and its life is also a big problem. The silicon plate currently in service has a period of 25 years. Can perovskite achieve this time? According to the data, there are some difficulties.

On the other hand,

perovskite is also very sensitive to air and water, but it can be protected by transparent materials. The most serious problem is the crystal structure of perovskite itself. Damn it... In some cases, the structure of perovskite will change after heating up. Although it is reversible, it will still affect the power generation efficiency.

Xu mang is very desperate,

this problem is a little difficult, in short, let's talk about it after returning home.

In the next few days, Xu mang had a very hard time. Ghost knows how he spent it. When all the people in the classroom were gone, Xu mang was woken up by Yang Xiaoman. He raised his head and looked around for a moment. He asked in a confused way, "what about people? Why are there no more people? "

"It's over!" Yang Xiaoman said angrily: "I'm in class, didn't you hear a word? Do you know how long I prepared it last night? You pig hoof... Don't respect me at all. I'm so angry! "

"Cough..."

"I have no way." Xu mang said awkwardly, "what to do if you don't understand? I am so honest that I fall asleep when I don't understand. Do you give me money for my speech

"No

"But give me the Honorary Professorship." Yang Xiaoman seriously said: "tomorrow I have a public class, saying... You accompany me, or I will be nervous, you should not want to see your wife because of tension, so suffer from depression?"

Xu Mang: @ @ ￥% %

I...

My God!

It's a waste of two days, but it can extend the holiday.

After leaving the classroom,

Xu Mang and Yang Xiaoman planned to go to the scenic spots in the afternoon. As a result, when they passed the building of mathematical physics and life science, Xu mang was suddenly stunned. There was a blackboard beside the gate, on which nothing was written.

"What's the matter?" "Is there a problem?" Yang asked"On this blackboard, it says, the smartest and the most powerful problem solvers." Xu mang frowned and said seriously, "is there no genius in this university?"

"What do you want to do?"

"Don't do anything... If you are in a foreign country, do as the Romans do. In case someone else is holding a machine gun, you will be killed suddenly." Yang Xiaoman stood on tiptoe, gently pinched Xu Mang's ear and said gently, "good... Or I'll beat you."

Alas...

speak the most vicious words in the most gentle tone.

Damn it!

However, Xu mang has always been rebellious, otherwise he would not marry Yang Xiaoman. He quietly picked up the chalk and wrote down a formula. The process took only half a minute. He turned around and said with a smile: "let's go...

" this... "

" what are all these? " Yang Xiaoman asked: "what kind of demon are you starting to do again?"

"A mathematical formula."

"We need to use the Chen hardy Littlewood theorem." "Although it has not reached the world-class difficulty, it is enough to make the science students, professors, scholars and experts of Pacific University confused for half a year," Xu said calmly

"Cut!"

"I don't believe that." Yang Xiaoman said disapprovingly: "the world is not your most intelligent, I believe there are more intelligent than you."

After that,

suddenly, he sprinkled dog food, held Xu Mang's beautiful face in his eyes, and said earnestly, "but you are the only genius in my mind!"

"Let's go!"

"My knight, Princess Ben wants rainbow ice and ginger ale!"

...

in the afternoon,

in the afternoon,

a professor of mathematics, who was engaged in mathematical research, went to the building of mathematical physics and life sciences with his own materials. As soon as he walked into the building, he saw the blackboard beside it full of contents, which made him stop.

It's been nearly a year, and the content on the blackboard has appeared again. Although this idea was proposed by him two years ago, it has only lasted for less than one year. Then everyone's enthusiasm has dropped. The lack of reward mechanism has made many people lose their motivation.

Unexpectedly,

it appears again.

The professor walked a few steps to the blackboard, and then saw a not so complicated formula. At first, he didn't pay attention to it. But when he was trying to solve it, he suddenly realized that the formula was not as simple as it seemed.

"Eh..."

"who wrote this?" Professor de huaike's scalp was numb at this time. The deeper he went, the more he felt that the formula was not simple. It was completely beyond his understanding. According to the truth, it didn't seem to be written by students, but there were not many professors engaged in professional mathematics. After all, Pacific University was weak in academic and natural science.

Damn it,

who wrote this asshole's formula?

Professor dworkor picked up his mobile phone, photographed it directly, and then sent it to a friend of his by email. He is a math professor at Princeton University. He can be a professor in Princeton mathematics department where madmen are gathering and dancing. His strength is extraordinary.

For a long time,

when Professor dwecker returned to his office from the professor, suddenly his mobile phone rang. It was his friend.

"Dwayko!"

"This... Is this what you came up with?" This professor of mathematics at Princeton University, with a trace of surprise, quickly asked: "this... This is very difficult. I have just studied it with other professors in the Department of mathematics and found that... It needs a variety of proofs."

"None of you can do it?" "I know it's hard, but I'm a little surprised that it's going to be difficult for you," dwecker asked in surprise

"Say..."

"is this what you came up with?" Asked the professor.

"No!"

"I don't know who wrote it. I asked everyone in the math department, and no one admitted it." "By the way, Professor Xu Mang of China is on vacation in Hawaii, and his wife is still giving a speech in our school."

"..."

"it must be him!"

"It must have been written by Xu mang." The professor said solemnly, "most people can't think of such a difficult formula. My God... If you meet, you must get the answer from him. We people are very anxious now."

"Good!"

After hanging up the phone,

dwecker showed a wry smile. He should have thought that this was written by Xu mang. If one can achieve such a high achievement in physics, his mathematical talent is not too bad. After all, he is engaged in theoretical physics, which is full of a lot of mathematical calculations.

At the same time,

at Princeton University,

the math professor was quite speechless. Unexpectedly, Xu mang went to Hawaii and worked out a mathematical formula for you. This guy is really a headache. However, although the professor is helpless to Xu Mang, he is very honest.I silently tweeted the formula to others. I hope someone can solve it. Then I attached Xu Mang's current coordinates at Pacific University in Hawaii.

In less than an hour,

this tweet exploded directly,

by the way, there was also the unknown Pacific University.

The president of Pacific University has received numerous phone calls, imploring Him to keep Xu Mang, at least to keep the damned answer.

......

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