I Don’t Want to Win Lying Down

oversized classrooms,

Yang Xiaoman was on stage talking about his family history and the case of using finance to like foreign markets, while Xu Mang was sitting in a corner, dozing off boredly. Many students come to attend classes.

hell...

I feel that Xiaoman is much more famous than myself, what's the situation? Shouldn't these people be more obsessed with themselves?

What is the situation?

Xu Mang took out his mobile phone to take a picture of his face, and found that he was still so handsome, even more handsome than before. In the past, he was young and frivolous, with a feeling of chasing the wind, but now he is more mature and stable, I have to say. ..it's just so cool.

bored,

Xu Mang took out a pen and a notebook from his bag, and started researching on the application of perovskite in solar energy. Of course, he couldn't do without his mobile phone, and some information could only be found online, although there were still a lot of reprints in his brain. The data, but the database has been updated, and I am usually so lazy...

According to the tandem structure proposed by Xu Mang, from the perspective of solar energy, the important property of these materials is that incident light causes their negatively charged electrons to enter a higher energy state, leaving vacancies or holes, which act like positively charged particle of.

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

Theoretically so,

But there are many problems. For the time being, they do not have the ability to manufacture large-scale high-efficiency battery grids. The problem is that it is more difficult to produce uniform coatings on larger sizes. However, Xu Mang proposed to use transparent electrode films to collect current.

Facts have proved that it does not work. These electrode films can allow a lot of light to pass through, but they also have a slight resistance, which will block some current. In larger sizes, the problems caused by this resistance are more prominent, and they cannot be expanded like silicon panels. area to increase the conversion rate.

Xu Mang did a simple calculation. The efficiency of a 6.25 square centimeter perovskite battery is 20%, but when thirty-five grids are combined into a 412 square centimeter module, this One percentage dropped to twelve percent.

but...

Even so, perovskite batteries are easier to produce than silicon batteries, and they are also cheaper. Xu Mang has investigated the process of making silicon, which needs to be heated at 1800 degrees. When preparing high-purity slabs, the material needs to be Dissolved in three hundred degrees of hydrochloric acid.

On the contrary,

Perovskite cells require only an inkjet printer to deposit a small amount of material onto a plastic film.

well...

It's so annoying! Xu Mang sighed. If it wasn't for his wife, he would have torn up these contents a long time ago. It's not easy being a man, and it's even more difficult being Xiaoman's man.

what to do?

What else can I do, who let me marry such a woman.

Putting aside the conversion rate of perovskite batteries, its lifespan is also a big problem. The current silicon plate in service has a lifespan of 25 years, and can perovskite reach this time? According to the data, there are some difficulties.

also,

Perovskite is also very sensitive to air and moisture, but this can be protected with transparent materials, the most serious thing is the crystal structure of the perovskite itself, damn it... in some cases, when the perovskite heats up, it will happen Structural changes, although reversible, still affect power generation efficiency.

Xu Mang was very desperate,

This question is a bit difficult, in short... let's talk about it when we return to our country.

In the following time, Xu Mang had a very tormented life. Who knows how, when everyone in the classroom was gone, Xu Mang was woken up by Yang Xiaoman,

He raised his head and looked around for a while, then asked in confusion, Where are people? Why are there no people?

It's over! Yang Xiaoman said angrily: I am in class, did you not listen to a word? Do you know how long I prepared last night? You big pig's hooves... have no respect at all. Me, I'm so mad!

Ahem...

I can't help it either. Xu Mang said awkwardly, What if I don't understand? I'm so honest, I automatically fall asleep if I don't understand. By the way...you didn't get paid for the speech?

No.

But give me the position of honorary professor. Yang Xiaoman said seriously: Tomorrow I have an open class. By the way...you accompany me, otherwise I will be nervous. You don't want to see your wife because Are you nervous and suffering from depression?

Xu Mang: @#￥%...%

I...

Oh my God!

Two days wasted in vain, but the vacation can be extended.

leave the classroom,

Xu Mang and Yang Xiaoman planned to go to the scenic spots in the afternoon, but when they passed by the Mathematical Physics and Life Science Building, Xu Mang was suddenly stunned. There was a blackboard next to the gate, with nothing written on it, and it was empty.

What's wrong? Yang Xiaoman asked, Is there a problem?

It's written on this blackboard, the smartest question maker and the best solver. Xu Mang frowned, and said seriously, Aren't there any geniuses in this university?

what you up to?

Don't make trouble... You are in a foreign land, you have to do as the Romans do, in case someone else takes a machine gun and beats you to death the next day. Yang Xiaoman stood on tiptoe and gently pinched Xu Mang's arm ear, and said softly: Be good...or I will beat you up, old lady.

well...

Speak the most vicious words in the most gentle tone.

hateful!

But Xu Mang has always been rebellious, otherwise he would not have married Yang Xiaoman, so he silently picked up the chalk and wrote down a calculation, which only took half a minute, turned around and said with a smile: Let's go... .”

this...

What's all this? Yang Xiaoman asked with a confused face: What kind of monster have you started to be again?

A mathematical formula.

The Chen-Hardy-Littlewood theorem needs to be used. Xu Mang said indifferently: Although it has not yet reached the world-level difficulty, it is enough to make the science students, professors, scholars and experts at Pacific University confused for half a year. time.

cut!

My mother, I don't believe it. Yang Xiaoman said disapprovingly: You are not the smartest in the whole world, I believe there are people who are smarter than you.

finished speaking,

Suddenly sprinkled dog food, held Xu Mang's prosperous beauty, and said seriously, But you are the only genius in my heart!

Let's go!

My knight, this princess wants rainbow ice and ginger ale!

...

afternoon,

A professor Dwyake, who is engaged in mathematics research, went to the Mathematical Physics and Life Sciences Building with his own materials. As soon as he entered the building, he saw that the blackboard next to him was full of content. The professor stopped.

almost a year,

There was another content on this blackboard. Although he came up with this idea two years ago, it only lasted for less than a year, and then everyone's enthusiasm dropped. The lack of reward mechanism made many people lose power.

Unexpectedly,

It appeared again.

The professor took a few steps towards the blackboard, and saw a not-so-complicated formula. He didn't pay attention to it at first, but when he was about to solve it, he suddenly realized that the formula was not as simple as it seemed.

Huh...

Who wrote this? Professor Dwight's scalp was tingling at this moment. The deeper he went, the more he felt that this calculation formula was not simple, and it had completely exceeded the scope of his own comprehension. Logically speaking, it didn't look like a student wrote it. Yes, but there are not many professors engaged in professional mathematics. After all, Pacific University is weak in academics and natural sciences.

damn it

Who the hell wrote down this bastard's calculation?

Professor Dwyake picked up the phone, took a picture of the content on it, and then emailed it directly to a friend of his. He is a professor of mathematics at Princeton University, and he can gather and dance with madmen. As a professor in the Princeton Department of Mathematics, his strength is extraordinary.

for a long time,

When Professor Dwight returned to his office from the professor, suddenly his cell phone rang, and it was his friend.

Dwyke!

This...is this what you came up with? The professor of the Department of Mathematics of Princeton University asked hurriedly with a hint of surprise in his words: This...this is very difficult. Just now I and other students from the Department of Mathematics The professor researched it together and found that...a variety of proofs are needed.

None of you can do it? Dwyake asked in surprise, I know it's difficult, but I'm a little surprised that it's difficult for you.

Say...

Did you come up with this? asked the professor.

No!

I don't know who wrote it. I asked everyone in the Department of Mathematics, but no one admitted. Dhuaike suddenly thought of something, and hurriedly said: That's right...Professor Xu Mang from Huaguo On vacation in Hawaii, and his wife gave a lecture at our school.

...

It must be him!

It must have been written by Xu Mang. The professor said seriously, Most people can't think of such a difficult formula at all, my God... If you encounter it, you must ask him for the answer, we people Very anxious now.

good!

hang up the phone,

Dhuaike showed a wry smile. He should have thought that this was written by Xu Mang. A person who can achieve such a high achievement in physics must not be too talented in mathematics. After all, he is engaged in theoretical physics, and it is full of Lots of math calculations.

at the same time,

Princeton University,

That mathematics professor was quite speechless. Unexpectedly, Xu Mang went to Hawaii, and even made up a mathematical formula for you. This... this guy is really a headache, but... although the professor is very interested in Xu Mang Very helpless, but the body is very honest.

Silently posted the formula to his twitter, telling others that this was the formula given by Xu Mang, hoping someone could solve it, and then attached Xu Mang's current coordinates, located at Pacific University in Hawaii.

less than an hour,

This tweet just exploded.

By the way, there is also the unknown Pacific University.

The principal of Pacific University received countless calls begging him to keep Xu Mang, at least keep the damn answer.

 …