Rapid solution and application of Boltzmann's equations》

Su Mu originally thought that he would need to spend at least ten days and half a month to determine a new thesis topic and go to a relatively weak sci, but under the limit calculation of the green level, Su Mu directly had a new inspiration after only using the last few minutes of review!!

The Boltzmann equation is the fundamental equation of statistical physics and lays the foundation for the second law of thermodynamics. Since the last century, it has become a basic equation for the study of rarefied gas dynamics, and has important applications in aerospace, MEMS and shale gas development, but the direct numerical solution of this equation has always been a major problem and challenge faced by mankind.

Su Mu's main inspiration was a research paper on the non-equilibrium oscillation behavior of ultracold Fermi gases, which explained in detail the experiments of the Cavendish laboratory, but Su Mu felt that if he could build on this, he could further develop the fast Fourier method to solve the Boltzmann equation and the Enskirk equation, which describes dense gases.

Moreover, if the kinetic theory model equations for polyatomic gases are established, it seems that for the first time, some of the influencing factors in the results of Klingberg's permeability dilute gas seepage experiment can be successfully explained!

"Awesome."

Because of this inspiration, as soon as Su Mu recovered from the weak state of the limit operation, he immediately threw himself into the intense thinking and calculation, and because his current physical fitness level has gradually improved, the weak impact of the limit operation on him is far less strong than the first time!

Three days!

It only took three days, and Su Mu also deliberately took a leave of absence to skip a music class and some advanced math lessons to study this topic, and on the first Monday of November, that is, November 1, he directly wrote the finished version of this paper!

The full English translation is even attached, reaching the level of direct submission of the first paper! I'm going to find a time to go to Professor Chen Bing's side again and ask them to help observe and observe.

"Grade 14 Mathematics plus Limit Operations."

Su Mu thought silently.

Because the time required to think about the limit operation every time is a green skill point, it is too extravagant to use, even if he has always had such an idea, he has not implemented it.

I didn't expect this mistake at all, the effect of trying to think about the paper under the limit operation for the first time was so good, and it broke through a lot of bottlenecks that took a lot of time!

And this is just over a minute in the remaining time of the competition, if the whole time is spent thinking about the paper, I'm afraid that the details can be done better and more efficiently??

One thing to say, Su Mu was really excited.

It's a pity that the skill of extreme computing costs skill points and enters a weak state every time, otherwise he really wants to be in this medium-high efficiency buff bonus all the time.

The limit is now at the green level of 10 minutes, but if it is upgraded to the blue level, or higher, it should last longer, right?

Su Mu looked forward to it silently, looking forward to such a situation, but he silently glanced at his remaining skill points, and couldn't help but sigh, there is a long way to go.

.......

.......

"According to our news report, today, the Huaxia Chang'e-4 lander ended its cold and long moonlit night dormancy, woke up by the light, and ushered in the 18th lunar day."

"Among them, when the Yutu-2 land patrol and exploration was carrying out the third exploration mission, it was inexplicably affected by an electromagnetic influence and lost its operation, and after shooting a survey video, it has lost contact with the main control room."

"However, when the last survey video source came, it was found that there was a black shadow of a moving object in the C9 area on the far side of the moon.

"Yutu-2, as the world's first spacecraft to make a soft landing on the far side of the moon, is mainly tasked with landing on the surface of the moon, continuing to scientifically explore the lunar geology, resources and other aspects of the information at a deeper and more comprehensive level, and improving the lunar archives."

"..... of them"

On the day that Su Mu was researching the completion of his paper, a very formal news program broadcast a very eye-catching news, at first the news was only spread in a small area, but after being transmitted to the Internet by an unknown netizen, the video also circulated directly.

In the last few seconds of the lunar probe's mission, there was indeed a black shadow flashing, as we all know, there is no living thing on the moon, so after the news spread, it was instantly on the hot search of major platforms.

"It must be fake, how can there be creatures on the moon, there is no oxygen on the moon."

"I also think it's fake, this kind of important confidential news will definitely not be broadcast, and what can be released is definitely that kind of mediocre news."

"Maybe it's because our Huaxia has made new progress on the moon and discovered a special creature, but this time it's just a preview?"

"You are all guessing, this black shadow must be some alien, hehe, no one, knows better than me, the moon."

"Our country is also going to land people on the moon this year, the country across the coast has been on the moon for many years, why hasn't our country planned it yet?"

"I heard that the moon landing will be carried out in the next two years, and the International Space Station has been built some time ago, and the next step will definitely be the moon landing operation and exploration of Mars."

"You don't know this, in fact, our country has already landed on the moon, and Mars has been there several times. No one, better than me, understands Mars. ”

There are different opinions on the Internet, not only that, but in fact, this matter is also highly discussed among major universities.

Su Mu was about to take a little rest on Monday afternoon, and then went to the School of Mathematical Sciences with his thesis to find Professor Chen Bing and them, when he heard Zhuge Chuixue and Shen Tianhao watching this video together.

"Faun, do you think this video is real?" Zhuge Chuixue opened his mouth and asked Su Mu: "I thought it was P at first, but then I looked at the news station and found that it was indeed pushing this news." ”

"This should be a strategic need, I think it is building momentum, although we have won the trade war, we may now start to establish a dominant position in the aerospace field." Shen Tianhao belongs to the strategic party, he doesn't believe that the video is true, after studying physics for so many years, he still believes in knowledge, and the two looked at Su Mu and wanted to ask his opinion.

"Video? What a video. Su Mu had just recovered from the afterglow of the paper at this time.

"This is it." Zhuge Chuixue opened Dilidili with his mobile phone and handed a video to Su Mu.

Su Mu nodded and looked at it intently.

"The tidal force between the Earth and the Moon causes the Moon's rotation to gradually slow down, eventually causing the Moon to be tidally locked by the Earth, after which the Moon always faces the Earth on the same side. The other side of the Moon is never fully visible from Earth. Only 18% of the far side can be observed due to Libra motion and parallax, hence the name "the far side of the Moon". ”

"The far side of the moon and the dark side of the moon are different concepts...."

This is not only the original version of the video, but also the interpretation of the up master of a science and technology area, some knowledge points of popular science are quite good, Su Mu was also thinking about his words while listening.

Sure enough, nearly two-thirds of the way through the video, an extremely small black shadow flashed, and then the detector fell into a black screen.

The corners of Su Mu's mouth opened slightly, and the moment he saw this scene, his face instantly became strange.

Because this kind of black shadow, and it was discovered through a lunar probe, it is too "science fiction".

"This.... Alien? ”

Su Mu quickly analyzed the image of the last scene in his mind, and went back and watched it several times, but the speed of this black shadow was too fast, and the time of existence was not even a second, and it could only be a black shadow.

"I think there's a problem too! Maybe aliens are really ready to invade Earth! Have you seen the three-body problem, isn't there the law of the dark forest in it, and the wall-facing and wall-breakers? Zhuge Chuixue nodded excitedly, his views were similar to those of Su Mu, and his ideas were more radical.

"If it's an alien, it must appear on the moon, so why didn't it appear on the earth, if they all have the strength to reach the moon, it shouldn't be a big problem to come to the earth for a visit." Shen Tianhao still insisted on his opinion, believing that the video was faked or an accident.

"It's not necessarily that it hasn't appeared on Earth, not many people have said that aliens have been discovered over the years, maybe they have been hidden." Zhuge Fuxue said.

Tianhao smiled helplessly and gave up arguing again.

Su Mu returned the phone to Zhuge Chuixue and sorted out his hairstyle: "The country must pay more attention to this matter than us, wait for the news to report slowly, it's useless for us to discuss it here now." ”

.......

.......

London, England, in a small cottage.

Li Xi sat quietly on the sofa and used his computer, and the screen on the computer was playing the video of the so-called detector step by step. Unlike the videos that ordinary people come into contact with, the videos she sees have been specially processed, not only with higher definition, but also in key areas, they are completely playing frame by frame.

"The butterfly effect?"

Li Xijing's head is a little complicated, and she is a little confused, she has watched this video no less than twenty times, but she clearly remembers that there was no big news about the moon at all!!

Even when the so-called Dark Age arrived, it was only a manned landing on the moon and plans to go to Mars.

"What the hell?? Alien?? ”

Li Xijing shook her head, and the corners of her mouth twitched unconsciously.

It can't be aliens.

The cause of the Dark Age is mainly due to the arrival of the Little Cambrian and the exploration of unknown energy sources, and the fusion of the environment has caused most cities to be unsuitable for human existence, and can only be achieved by building shelters and arks.

Throughout the Dark Age, countless people have speculated about the existence of aliens, but even at the end of the Dark Age, when the Dawn Age was reached, there was never a real "alien" in the sharing of global information at that time.

"This butterfly effect is a little too big."

Li Xijing's current identity is a senior in high school, but now because some of the goals she needs have been achieved, she has applied to the school for a leave of absence, and the two large laboratories she is now secretly in her hands are in Qianbei and the other in London, both of which are important areas for future shelters and the construction of the ark.

"Well, it's actually quite big."

Li Xijing stroked her hair, with an indescribable sense of maturity.

Fan Ze is now studying at the University of London, and in Li Xijing's understanding, according to the original historical process, Fan Ze would stay in China at this time, but because of his appearance, Fan Ze came to London. Not only that, but because of some of her layouts, many places have also changed, and some of the research invested in has accelerated or slowed down the process.

The previous butterfly effects were all within her acceptable range.

But now.

What the hell is this dark shadow of the moon???

The butterfly effect on the earth can also be applied to the moon??

This made Li Xijing realize for the first time that things were out of her control.

Through image detection, this black shadow is definitely not an accident or screen failure, and it is estimated that various national levels will soon know about this matter, but unfortunately the reason for the leak of the news Li Xijing has not yet been investigated, this kind of news should be strictly confidential, it is hard to imagine that it will be broadcast from the news.

The only thing she knew was that the video did come from the Wenchang launch center in the South China Sea, and that it happened just a week ago.

"I've been in contact with SpaceX, and they're saying they're going to go to the moon in advance... Countries will also start to pay attention to this aspect. ”

Li Xijing received a text message and was thoughtful.

......

......

Su Mu also paid a little attention to this news.

On the way to the Academy of Mathematical Sciences, I also took out my mobile phone to check a little more news.

It's a pity that there are different opinions on the Internet, and Su Mu can't find any particularly correct news channels for a while.

Because there is still something to do, he doesn't pay attention to this aspect anymore, he thinks that as long as he can brush up the skill points first, and then brush the skills of mathematics, physics, chemistry and so on to the full level, let alone the dark shadow of the moon, even if there is really the arrival of aliens, it will not hurt.

After all, no matter how terrifying the world is, it can't reach the true source of his system, if one day Su Mu can figure out the reason for the appearance of his system, aliens and the like are trivial matters, his main task now is to improve his strength first, otherwise, he will not even have the strength to explore the unknown.

Soon, Su Mu arrived at the Academy of Mathematical Sciences, because he had been here once before, Su Mu easily found the location of the office.

Today's door is still ajar, and Su Mu is about to knock on the door.

The office door opened on its own.

.......

.......

PS: A note about the June update.

This month is exam month, and there will be a little less updates, but the daily updates are 4,000 words of big chapters.

It is equivalent to the previous two more~

Then there is the report on the average subscription, which is now 2995, and there are still 5 missing.

Ask for a genuine subscription, preferably on the side of the starting point Chinese network, the last 5.

The last 5 QAQs.

Have you seen the reader, poor and pitiful, I will assist (poor Baba).