Into Unscientific

 Chapter 615 The Unexpected Person (still ten thousand words updated)

ˆ “.”

 Offstage.

Hearing the words "Tai Shang", "Shang Qing", "Yu Qing" and other words coming out of Li Jue's mouth, Xu Yun's expression couldn't help but be a little subtle.

 According to the records of "Taizhenke" published in the Eastern Jin Dynasty or the early years of the Southern and Northern Dynasties:

“The highest number of the three days is Da Luo. It is the extreme realm of Tao and the wonderful energy is the same. Only this Da Luo gave birth to the three swallows in the Xuanyuan Dynasty and transformed into the three pure heavens.

“The first one is called Qingwei Tianyu Qingjing, which was created by Qi; the second one is called Yuyu Tianshangqingjing, which is made by Yuan Qi; the third one is the great red sky which is too clear, which is made by Xuanqi.”

 Hence, the word "Yuqing" refers to the atomic bomb project, which means the beginning of the entire nuclear weapons research and development and the starting point of the atomic energy industry.

  【上清】refers to the research and development of hydrogen bombs that the light nuclear team is responsible for. After all, the tactical value and deterrence of hydrogen bombs are much higher than that of atomic bombs, and they are the main vitality of the country's "human body".

As for [Taiqing], it naturally refers to the neutron bomb project.

The name of this project has a strong Chinese cultural flavor, and it would not be surprising at all if it were left to future generations.

 After all, let’s not talk about Sanqing.

 In later generations, the names of mythical characters such as Wukong, Chang'e, and Zhu Rong were also used in the naming of various scientific research equipment.

 No surprises.

Probably in a few years, in addition to Zhugang Hyena and Black Bear Spirit, other Chinese mythological characters will also come out to make guest appearances.

  But in this period, this kind of Orientalized naming seems very personal.

 At present, the projects of the rabbits are either 596, 823 or 614. The Zhuxian project that Xu Yun came up with was the first time in history.

And it is different from the previous Zhuxian project.

The naming of the Taishang project this time was an operation independently thought up by the capital itself, and Xu Yun did not even mention a single radical in the entire process.

Looking at it now

Perhaps the organization has awakened some strange attributes in advance and pursued the unique classical romance of China?

Of course, Xu Yun thinks this is a good thing.

Although this change in naming habits has little impact on the scientific research of rabbits, some barriers that should be invested in energy still require a lot of manpower and material resources.

  But in the field of communication studies, this title is of certain help to ordinary people’s understanding.

for example.

The original code name of the Dongfanghong project was 581, which was later changed to 651, but no matter which number it was called, it was not as easy to remember as Dongfanghong.

 The same goes for the atomic bomb project.

 The relevant code name that most people in later generations know is Miss Qiu. As for its standard title of 596, very few people know about it.

 So in Xu Yun’s opinion, this should be a good change.

all in all.

 At this stage, almost everything that should be announced at the meeting has been said.

Considering that many of the big guys had just experienced a long journey and were severely exhausted in terms of physical strength and energy, Li Jue quickly announced the adjournment of the meeting on the spot.

 “Xiao Han.”

However, just when Xu Yun was about to ask Lao Guo to help him push the wheelchair out the door, Li Jue called out to him:

"Xiao Han, don't leave yet. I have something to tell you. If your friend comes, you should stay. Xiao Han may want you to see him off later."

Xu Yun was slightly startled, but quickly nodded:

"OK."

Li Jue then chatted with a few leaders who stayed at the scene and had personal matters to deal with, then asked Zhou Cai to stay in the conference room to collect materials, and walked to Xu Yun:

 “Xiao Han, let’s go to my office to chat.”

 Xu Yun has no opinion.

 Then Li Jue pushed Xu Yun's wheelchair and walked with Lao Guo for a while, and soon arrived outside his office.

 After opening the door, he pushed Xu Yun's wheelchair into the house.

Xu Yun originally thought that Li Jue came to him to chat one-on-one. At most, there would be Lao Guo beside him to listen or give some opinions.

 After entering the office, he found that there were already two people waiting in the room.

The man sitting on the left is about 20 years old, with dark complexion and a childish look on his face.

 When he was sitting on the chair, his back was straight, his hands were neatly placed on his knees, and he was not squinting. At first glance, he was a capable soldier.

Next to the young man sat a man with a Chinese character face who was about forty years old. This man's eyes were not big, but the proportion of pupils in his eyes was very high, and the whites of his eyes could hardly be seen.

Xu Yun has been staying at the base for some time now, and when he saw this, he immediately recognized the other party’s identity:

“Comrade Yulin? Why are you here?”

 In the later life when Xu Yun traveled through time.

If you only briefly mention the rabbits' nuclear weapons development process, many people will probably think of the words Lu Guangda and Lop Nur.

But if you want to dig deeper into the development of nuclear weapons, there is one group that you cannot avoid no matter what.

This group is the "Eight Directors" of the Theory Department, known as the Eight King Kongs, and is mainly responsible for tackling various difficult projects.

They are Lu Guangda, Zhou Guangzhao, Yu Min, Huang Zuqia, Qin Yuanxun, ** Pei, He Guilian and

This is Zhou Yulin in front of Xu Yun.

Compared to Qian Wushi Lu Guangda, Zhou Yulin's life experience may not be considered legendary, and his popularity is far less than that of the two, but he is quite respectable.

Like Mr. Wang and Yu Min, he had changed careers halfway for the sake of the country, and he had changed careers not just once.

 Described using the concept of later online games, this is a proper three-turn boss.

 That’s right.

 For the sake of the country, he changed his professional direction three times.

Zhou Yulin graduated from the Department of Mathematics of Datong University and worked at Shuimu University after graduation. During this period, he has been engaged in topology research.

His topology papers were praised repeatedly by senior mathematicians such as Hua Luogeng and Duan Xuefu.

 At this time, he is enough to be called an expert in the field of topology.

 But seven years ago.

Due to the needs of the motherland, Zhou Yulin, who was sent to Maoxiong, was required to learn the theory of partial differential equations, which he had never learned before - because the country was in urgent need of talents in the theory of partial differential equations at that time.

 After arriving in Maoxiong, Zhou Yulin became a graduate student in the Department of Mathematical Mechanics of Moscow State University, where he studied the theory of partial differential equations from the internationally renowned female mathematician Oleynik.

In this completely unfamiliar field of study, Zhou Yulin took the first exam and scored sixth in the department, and then he never lost the top spot from the second time - the entire Department of Mathematics and Mechanics not only had Chinese students, but also all the students at that time. There are more than 70 people in the department.

Later, he collaborated with his mentor Oleynik to publish a paper on the seepage equation, and his groundbreaking classic work was recognized by the academic community.

Even by 2023, research related to the seepage equation will basically still be carried out along the framework of this paper.

Zhou Yulin is also the first foreign student in Chinese history to graduate in the direction of partial differential equations.

 However, three years ago.

Zhou Yulin ushered in his second job transfer.

 At that time, he was assigned to Base 221 and was asked to take charge of numerical simulation and fluid dynamics in theoretical research on nuclear weapons.

 Mentioned earlier.

 At present, the atomic bomb, that is, the [Yuqing] project has three main theoretical directions.

 They are fluid mechanics, material properties under high temperature and pressure, and neutron physics.

Now Lu Guangda is in charge of neutron physics, while Lao Guo is in charge of fluid mechanics.

 At the same time.

  The subject of fluid mechanics is divided into two directions: multi-medium radiation fluid mechanics and detonation fluid mechanics.

 The person in charge of multi-medium radiation fluid mechanics is none other than Zhou Yulin.

 This was another area that was completely unfamiliar to him, but he still learned this knowledge again without any complaints.

 Later, Zhou Yulin won the first prize of the National Natural Science Award and the special prize of the National Science and Technology Progress Award based on the results of his second transfer.

This is not over yet.

 At the age of fifty-five, he made the third career change in his life.

  Also due to the needs of the country, he delayed his retirement and shifted his direction to the field of computer applications, and then

 Won the special award of the first CSIAM Su Buqing Applied Mathematics Award.

 In 1991, the old man was officially elected as an academician, which was the best affirmation of the old man’s burning life.

 At the beginning of 2010.

Mr. Li Deyuan, who witnessed the development of nuclear weapons, guided the creation of a large-scale oil painting "Contemporary Heroes". There are eight figures in the front row, among whom the first one from the left is Zhou Yulin.

Mr. Zhou is also a well-known birthday boy. He was born in the year 23 and did not pass away until the year 21.

Xu Yun and Zhou Yulin didn't interact much in the past, but they could still be called by their names.

Seeing Xu Yun call out his name, Zhou Yulin also had a smile on his face:

 “Comrade Han Li, good afternoon.”

Then Li Jue pushed Xu Yun to the two of them, and he came to the desk and drank a glass of water before explaining:

“Xiao Han, I kept you here in the office today mainly because I have two things to talk to you about.”

“The first thing is about Comrade Yulin. Their project team has encountered some argumentation problems or disputes, so I would like to ask you for help to see if this problem can be solved.”

Xu Yun couldn't help blinking when he heard this, and asked curiously:

"what is the problem?"

Li Jue glanced at Zhou Yulin when he saw this. The meaning was very obvious:

 I don’t understand theoretical knowledge, you say!

Zhou Yulin nodded politely to Xu Yun as a greeting, then took out a stack of documents from the document bag beside him and handed them to Xu Yun:

“Comrade Han Li, take a look at this first.”

Xu Yun took advantage of the situation and took the document handed over by Zhou Yulin and began to look carefully.

ˆ “.”

A few minutes later.

Xu Yun slowly raised his head, held a corner of the document with his fingers, and asked Zhou Yulin in slight surprise:

“Comrade Yulin, have you actually calculated the relevant categories of fluid viscosity?”

 “That’s right.”

Zhou Yulin nodded, pointed at the document in Xu Yun’s hand and explained:

“Comrade Han Li, didn’t you help Lao Lu and others calculate the nonlinear neutron transport equation before?”

“Later, the theory department distributed the entire derivation process to each core group, and our group also studied and discussed it collectively.”

“Our original idea was to expand our ideas and horizons, but we didn’t expect that the nonlinear calculation process of the energy level of a single-energy strong neutron source gave us a lot of inspiration.”

“After the discussion, we used some of the ideas and successfully solved all the originally difficult problems of piecewise polynomial function reconstruction and one-dimensional complete gas.”

 Xu Yun finally realized what he was doing.

I see

Although Xu Yun did not know exactly how Zhou Yulin and the others achieved the breakthrough because there was no specific calculation process in the document, there were only a few possibilities for this kind of thing.

 Either start from a single unknown pressure, or perform a combined transformation of the mechanical energy gradient, at least the direction is not difficult to guess.

These ideas are indeed closely related to the nonlinear solution method he mentioned before, and it is normal for Zhou Yulin's team to get inspiration from them.

Hence, Xu Yun did not delve too deeply into this matter that had already been solved, but directly asked about the problem Zhou Yulin was facing now:

“Comrade Yulin, I don’t know what your current progress is.”

Zhou Yulin sighed quietly after hearing this, the expression on his face became much darker, and he said solemnly:

“I’ll tell you the truth, Comrade Han Li.”

“The reconstruction of piecewise polynomial functions and the breakthrough of one-dimensional complete gases are gratifying, but they also make our group’s computational work somewhat out of touch.”

“Our original grouping method was that most of the team members calculated a certain problem, and a small group of team members made anticipated preparations for the post-breakthrough process—this is somewhat similar to the way the base set up a light nuclear team when researching atomic bombs.”

“However, with the continuous breakthroughs in the previous two problems, all the preset links that should have been solved have disappeared. Our entire team can only start from scratch in the field of fluid viscosity.”

“As a result, there have been some serious differences and barriers to derivation, and no one can convince anyone.”

“Our group has been discussing it for three or four days without coming to a conclusion, so we can only find you here.”

Xu Yun nodded slightly, and he guessed it was the same.

 As a well-known stable player.

 Rabbits’ research projects have always left a certain amount of preset space in front of the current node, which is regarded as a kind of advance amount.

 That is, when problem A is about to be solved, some manpower will be allocated to prepare for the next project B.

These assigned members may calculate some initial problems, may translate and retrieve some information in advance, and may also sort out the general structure, which is a bit like the ancient military and horses that have not yet moved the food and grass.

But now Zhou Yulin and the others unexpectedly broke through the two problems that were originally stuck in the front. It was like the troops and horses rushed to the front of the grain transport convoy, and the so-called reserved space naturally no longer existed.

In this situation.

 In a completely new field, everyone is blind and has not even sorted out the overall direction. There is still a high possibility of encountering problems or arguments.

Zhou Yulin then pointed to the document in Xu Yun’s hand and motioned for him to turn to the second page:

“Comrade Han Li, our research team currently encounters two main problems—to be precise, it should be a controversy and a derivation barrier.”

Xu Yun blinked and subconsciously blurted out:

 “Controversy?”

Zhou Yulin hummed and explained:

 “Yeah, a controversy.”

“That is, why does the fluid cause normal stress when it moves?”

 Said.

Zhou Yulin raised the palm of his left hand upright in the air and flattened the palm of his right hand. The two showed a vertical state:

“There is friction between solids in viscous fluids, and the roughness causes tangential friction. This is understandable.”

“There is a velocity gradient when flowing at the same time, causing tangential force. This is also understandable, but where does the normal force come from?”

“If this problem is not explained clearly, we will not be able to start the next derivation.”

Xu Yun was stunned again, but this time he was not in a hurry to speak.

 It turned out to be normal stress?

 It is well known.

 The so-called viscous fluid is simply a fluid whose viscosity effect cannot be ignored.

  Hybrid fluids in nature, that is, macroscopic fluids, are more or less viscous, so viscous fluids are also called actual fluids. For example, that thing—yes, it’s the thing you were thinking about for a second, you LSP.

But on the other hand.

The above sentence does not mean that microfluids are not viscous fluids. Some microfluids also have this viscosity.

 For example.

 The internal conditions of an atomic bomb during its detonation.

Therefore, for Zhou Yulin’s team, it is obvious that many properties of viscous fluids must be understood in advance. This is the basis for their new research topic.

 Among them, tangential force and friction force are the simplest, but normal stress is somewhat difficult to understand.

 After all, Zhou Yulin wanted to come.

  Pressure is brought by the surrounding fluid. The state of the fluid is determined by density and velocity gradient. So where does the normal stress come from?

Yesterday, a relatively heated discussion broke out in the research group about this, and two team members with relatively fiery personalities almost started fighting.

Looking at Zhou Yulin who was a little bored, a trace of reminiscence appeared in Xu Yun's eyes.

 Unexpectedly, he also encountered this problem in the copy

 Is it a coincidence?

 Or is it destiny?

Xu Yun also had doubts about this question when he was taking fluid mechanics as an elective. Later, a kind-hearted senior gave him an answer in the library.

That senior went to Jincheng Institute of Science and Technology after graduation. Unfortunately, his left foot was amputated due to a traffic accident in 2012, and he finally left the field of scientific research. Now Xu Yun cannot contact him.

 What’s more, Xu Yun was deeply impressed.

This question needs to be answered through the assumption that the constitutive equation is isotropic, but the senior student’s explanation did not involve mathematical calculations at all and only tested one’s understanding ability.

Now that we have encountered the same problem again, let the senior student’s answer explain Zhou Yulin’s doubts. Perhaps this explanation will become famous in this time and space.

 Then Xu Yun paused, made a gesture in the air with his hands similar to the Tianjin Rice Sun Fist, and explained to Zhou Yulin Zhou Yulin:

“Comrade Yulin, regardless of the thermal effect for the moment, please imagine a ball of constant-temperature gas that expands or contracts uniformly, and there is no shearing motion at this time.”

“First we imagine that this lump of gas expands uniformly to a certain volume, and then shrinks uniformly back to the initial volume. If there is no viscous force and the stress is exactly equal to the pressure, then the total work of the two processes is zero, right?”

Zhou Yulin thought for a moment, touched his chin and nodded.

Xu Yunze said again:

“But various experimental phenomena tell us that the real world is not so perfect, and losses often exist.”

“In other words, as long as we disturb this gas, even if we finally restore it to its original state, we still have to put in some work.”

“To achieve this, it is required that when the gas expands uniformly, the stress is smaller than the pressure, so less external work is done; when the gas contracts uniformly, the stress is larger than the pressure, allowing the outside world to do more work.”

“So, this kind of fluid that will produce losses when it expands uniformly will also have viscous force when there is no shear motion, and this viscous force is normal like pressure—this is the origin of normal force.”

Zhou Yulin was a little stunned at first, and he didn't understand Xu Yun's idea.

 But when Xu Yun was halfway through speaking, his eyes gradually glowed with an inexplicable brilliance, and became brighter and brighter.

By the end, his eyes were filled with excitement!

Snapped!

He clapped his hands vigorously and subconsciously praised:

“Wonderful, this is so wonderful, Comrade Han Li, you are such a **** genius!”

Zhou Yulin never imagined that this problem could be explained in this way?

 Previously, everyone in the research group tried to start from the theorems of thermodynamics and discuss from the free energy inequality, but they did not expect Xu Yun's perspective.

Today he thought that Xu Yun wanted to list a lot of formulas like deriving the nonlinear neutron transport equation, so he brought a thick stack of calculation paper with him.

 As a result, Xu Yun actually found a different approach and explained the entire problem clearly using an air-polymerized particle.

 After a few seconds.

Zhou Yulin suddenly thought of something, clapped his hands again, and said to Xu Yun faster:

“Comrade Han Li, can your statement be understood in this way?”

“The essence of viscosity is actually the momentum exchange between molecules and the interaction force between molecules.”

“The molecules are constantly passing through each other, that is, there is mass exchange on this surface, so normal velocity appears.”

“And if the molecules in front of a fluid microcluster have a normal motion speed to it, then it is equivalent to molecules pulling or pushing the fluid microcluster, thus generating viscous normal stress?”

The words just fell.

This time, the person who was in a daze changed from Zhou Yulin to Xu Yun.

 Good guy.

Although the counterexample cited by Zhou Yulin is not that exaggerated and is still not divorced from the concept itself in nature, its understanding ability is really amazing.

 And if Zhou Yulin really follows this line of reasoning, he will discover another thing.

That is.

 The force integration result of viscous normal stress in some fluids is equal to 0, which means that it does not actually play a role.

 Once Zhou Yulin discovers this situation, the fun will be great.

Then Xu Yun took a deep breath, tried his best to calm down, and said to Zhou Yulin:

“Yes, Comrade Yulin, your example is also correct. This problem can also be explained according to the normal speed you mentioned.”

“But no matter which statement it is, with their explanation, the disputes in your group should be temporarily suspended, right?”

Zhou Yulin nodded repeatedly when he heard this, with a hint of helplessness in his tone:

 “That’s it, that’s it.”

"Comrade Han Li, you don't know something. Yesterday, two comrades in our group had different opinions during the discussion, and they got really angry in the end."

“If we hadn’t started early, we might have gone to the full martial arts training yesterday—the two of them are usually very quiet.”

“In the final analysis, our project is too stressful. Many people have been tense for a long time, and it is easy to do this if the psychological pressure cannot be released, hey.”

 The speaker has no intention, but the listener has intention.

Zhou Yulin’s seemingly casual complaint made Xu Yun notice something that he had neglected before:

 Psychological construction of base members.

Base 221 has been isolated from the outside world for a long time due to confidentiality reasons. Although it covers an area of ​​more than 1,000 square kilometers, a large part of it is vast grassland.

 For the employees of Base 221, they can only go back and forth monotonously between two points and one line for several years. At most, they can go to the 18th Branch Factory to watch movies occasionally.

Although ordinary people these days can travel as quickly and easily as possible, they are not bound to a certain place for a long time - it is still very common for ordinary workers to visit relatives and friends in towns and villages during holidays.

In this case, many workers have been separated from their husbands, wives, parents and children for a long time, and they cannot even make a phone call for a year or two.

  Researchers are burdened with the "mission" of developing atomic bombs, so the mental health of base members is not a small issue that can be ignored.

Although this kind of pressure will not make people become as crazy as Li Huowang, the anger has not gone away.

Especially some of the young workers in the base would quarrel and fight from time to time - but usually they would be pulled away by the people around them within two punches, so no lives were lost.

According to the files of later Atomic City, 30% of the employees in Base 221 were deducted points or even received minor demerits.

Again.

 In a factory with more than 10,000 workers, most of the workers are not well educated, which is doomed to cause many problems in daily life.

This kind of problem cannot be solved by enlightenment or food and fish. It must have appropriate psychological counseling.

In the past few days, Xu Yun has been focusing on the technical layout, but he has indeed neglected the mental health of the base employees.

 Think about it now.

  Can you think of any suitable ways to relieve everyone's stress relatively effectively?

 For example, collectively shaving donkey hair to reduce stress?

Xu Yun frowned and thought carefully for a while, and found that it was still a bit difficult to come up with a clue in this environment.

So he put the matter behind him for the time being, preparing to take some time to think carefully about whether there was any good solution.

 The most urgent task now is to solve Zhou Yulin’s second problem:

“Comrade Yulin, what is the other question you mentioned?”

 “Another question”

Zhou Yulin's expression immediately became serious after hearing this. Obviously this problem was more serious. He just heard him say to Xu Yun:

“Comrade Han Li, this problem is much more complicated than normal stress, and is related to the radiation transfer equation.”

“Our original derivation of the radiative transfer equation did not consider the case of nonlinear neutrons, and the medium hydrodynamics framework we constructed is now obsolete, which is nothing to say.”

“But now that we have considered the local thermal equilibrium state, we can’t find a suitable idea for the base equation of the frame structure.”

“Comrade Han Li, you are very accomplished in thermodynamics, so I would like to ask you for help today to see if you can give me a more suitable idea.”

Hearing this, Xu Yun frowned slightly subconsciously.

Radiative transfer equation

 This is indeed a difficult point in the development of atomic bombs.

 Mentioned earlier.

 The mean free path of charged particles is much smaller than that of neutrons.

 Under the first-order approximation, the charged particles in the system can be regarded as being in a local thermal equilibrium state at any time, and the transport of mass, momentum, and energy by neutrons in a larger range is considered.

In a nonlinear state, the mathematical expression of this transport process is the nonlinear neutron transport equation derived by Xu Yun and Lu Guangda.

at the same time.

 This amorphous neutron Φ value will also affect the derivation of the radiative transfer equation model.

the reason is simple.

 Heat is transferred in three ways:

  Conduction, convection, radiation.

 The radiation is particles such as electrons, photons and neutrons used as media to achieve the transfer of thermal energy.

 But the behavior of these particles is more like dissipation or outflow. In addition to transporting energy, these particles also take away part of the momentum.

 Hence, the derivation of the relevant equations requires the introduction of many complex parameters, and even the absorption coefficient and scattering angle must be considered.

The construction of this kind of framework is inherently difficult. The addition of the neutron Φ value gives Zhou Yulin and others one more parameter to consider.

 This is just like solving a quadratic equation of one variable is definitely less difficult than a quadratic equation of two variables, because the former has only one unknown number when the powers are the same.

 It’s a coincidence.

Zhou Yulin and the others were not proficient in the reconstruction of piecewise polynomial functions and one-dimensional complete gases that they had previously solved. He was only in situations where he could roughly guess the solution but didn't quite understand it - just like many people know that turbulence must involve NS equations. But if you ask him to write the expressions of the NS equations, he will not be able to write them.

  However, the establishment of architecture after considering the local thermal equilibrium state happens to be his familiar direction.

 Because he happened to be responsible for theoretical research in this area when he was working at Chengdu Aircraft Corporation, but the research framework was not the atomic bomb, but to study a solution to coupled BGK molecular dynamics. (It’s not that I typed dynamics incorrectly, it’s called kinetics)

So he paused, considered it and said:

“Comrade Yulin, to tell you the truth, when I was studying at Cambridge University, I met a senior student named Xiao Yan who was proficient in thermodynamics.”

“Senior Xiao Yan once said something when he was studying a high-temperature substance called Buddha’s Wrath Fire Lotus. It was called Thirty Years Hedong Keke. It was wrong.”

“Under extremely high temperatures, the mean free path of radiation in a constant-density material can reach considerable values. Therefore, can it be considered that the temperature distribution in the medium can be approximately regarded as independent of space due to extremely strong heat conduction?”

 “In this case, can the temperature gradient be ignored?”

Those students who were sources of radiation in their previous lives should all know this.

 In the case of ultra-high temperature.

 The mean free path of radiation in light matter can reach considerable values. For example, the mean free path of radiation in a constant-density hydride file or quilt is about 6 or 3 cm, and it is completely determined by Compton scattering at high temperatures.

Hence, in systems where the transport of radiant energy in such a medium proceeds extremely quickly and whose size does not exceed a few mean free paths of radiation, the temperature in the medium can be considered almost uniform.

 That is, except for the very short time when the radiation passes, almost 10^-9 seconds, the temperature gradient in the medium can be ignored.

 This is also famous.

 Isothermal approximation of radiation hydrodynamics in high-temperature light media.

  A well-known female lol commentator in later generations once said a law called canyon theory of relativity:

 As long as you speed up your teammates, you are slowing down the opponent.

 Same reason.

 In the case of isothermal approximation, although Zhou Yulin and others have an additional amorphous neutron Φ value, they lack a temperature gradient.

 Hence, from the perspective of the nature of the equation, the unknown numbers are still the same, and the difficulty is not much different from the original one.

Of course.

Xu Yun is fully capable of showing the specific derivation process directly on the spot, but doing so would be too illogical and could easily reveal certain anomalies.

　Now my identity should be perfectly concealed, without any possibility of being exposed. Naturally, I should maintain this low profile as always.

Just when Xu Yun was full of confidence, Lao Guo suddenly coughed a few times and quickly took out a small tablet from his body and swallowed it.

I don't know what it is, Xu Yun always feels that this small pill is a bit familiar.

Hmm, it must be an illusion, I must be thinking too much.

Xu Yun then forced himself to bring his mind back to reality and asked Zhou Yulin:

“Comrade Yulin, what do you think of my idea?”

 Zhou Yulin did not answer Xu Yun directly when he heard this. Instead, he took out several pieces of data from his briefcase and looked at it carefully.

These data are the results of the rabbits’ past experiments. As one of the current leaders of the research team, Zhou Yulin naturally has the right to take these documents with him.

Then he chose a parameter related to rarefaction waves and started to calculate it.

Like isentropic flow, rarefaction waves or compression waves are easy to determine under high temperature conditions, so they are also called simple waves.

 In the simple wave region, r or s is a constant,

When s is constant, the C+ characteristic line is a straight line, the wave is forward, and the streamline enters each C from the right.

On the other hand, when r is a constant, the C-characteristic line is a straight line and the wave is backward.

Hence, by comparing whether there is a limited escape velocity for backward rarefaction waves, we can preliminarily determine whether Xu Yun's idea is feasible.

“The change in intensity flow is first reduced by cnIν, that is, Iνt+cnIν=0”

“Then the newly generated radiation Jν absorption coefficient kν at the right end is below, so Iνct+nIν=Jν(kν+σν)Iν+σνIν””

“The azimuth angle Ω on the unit direction vector n must also be averaged at all levels, that is, Jν=14π∫IνdΩHν=14π∫IνndΩKν=14π∫IνnndΩ”

 “Then go on to this and this and that”

 Ten minutes later.

Zhou Yulin put down his pen with a snap, raised his head excitedly and looked at Xu Yun:

“Comrade Han Li, there is still a limited escape speed, this idea is feasible!”

Xu Yun raised his eyebrows in surprise:

"Oh? That's great. If you can find the right general direction, the rest is just a matter of calculation."

Zhou Yulin also nodded in agreement:

“Yes, we who are engaged in scientific research are most afraid of running out of ideas. Consultant Han, you have helped our project team a lot this time.”

 Xu Yun naturally did not dare to accept Zhou Yulin’s gratitude. After all, a large part of his ideas came from a paper written by Zhou Yulin 27 years later. If Zhou Yulin didn’t blame him, he was a tauren.

all in all.

 After solving these problems, Zhou Yulin's goal today has been achieved.

So he said goodbye to several people one by one politely, and happily left the office and went back to the project team to report the good news.

 After Zhou Yulin leaves.

Xu Yun then set his sights on the male soldier who had been sitting aside like a sculpture and had not said a word from beginning to end.

It is clear.

 Another thing Li Jue said must be related to this person.

as expected.

Li Jue soon turned his attention to this young man, and then said to Xu Yun:

"Xiao Han, you are now the special consultant of the base, and the two project teams of Shangqing and Taiqing also serve as specialists."

“Although you have not officially joined the party yet, your status in the base is already considered to be at the core level.”

“But you don’t feel it. Do you seem to be missing something?”

 “What’s missing?”

Xu Yun shook his head in confusion:

“Director, what do you mean?”

Hearing this, Li Jue smiled and tapped him with his index finger, but he didn't show off and said:

 “You need a guard.”

 Xu Yun was suddenly startled.

Guard?

 For a later generation non-military person like him, this word is indeed a bit strange and abrupt.

But he soon realized that, indeed, in the current era, he seemed to be missing a guard?

After all, I am now at the core level of the base. Although the administrative level does not go up to a few cents or a specific official title such as division level, my salary and other benefits are paid according to the level of deputy factory directors like Lao Guo and others. of.

 And that’s not an exaggeration.

From the perspective of importance, Xu Yun's current strategic value dominates the entire base, and he can be properly regarded as a base hegemon. Ahem, base treasure.

Although Xu Yun now has Qiao Caihong taking care of her daily, this girl cannot be treated as a warrior.

 So it is normal for the organization to assign guards to him. This has nothing to do with the internal security of the base. It is mainly an insurance.

 Then under the watchful eyes of Xu Yun and Lao Guo.

Li Jue slowly walked up to the soldier, patted him on the shoulder and said:

“Xiao Han, this comrade is the guard assigned to you by the organization. Even though he is only 19 years old, he has been in the army for more than five years.”

“He is the security officer of Unit 819. The organization specially transferred him to Jinyintan to be responsible for your safety.”

“Oh, by the way, I haven’t introduced his name yet. This comrade’s name is”

 “Mou Fangdong.”

Note:

The vest defense battle has been successfully completed~, on the last day of the month, everyone who has a monthly vote can vote.

 (End of this chapter)