Into Unscientific

It is not difficult to see literally.

The theoretical research department led by Lu Guangda undoubtedly belongs to the absolute core project in the entire nuclear weapon development process.

So look at it from the perspective of posterity.

Naturally, the location of this department should be arranged in the frontmost branch factory, so as to reflect the importance of the entire department, right?

However, the answer is not the case.

Actually.

The area where the theory department is located is neither the first branch factory nor the second branch factory, but the serial number looks ordinary

Seven branch factory.

The seventh branch plant is located in the southwest of the base, and is responsible for theoretical research and experiments in radiochemistry and neutron physics.

This is an area with many dense buildings, but most of the buildings look like ordinary factory buildings, and the inside is unique.

After passing the first round of inspection by the "guard" at the gate of the factory, Xu Yun and Lao Guo entered the factory smoothly.

As for Joe Rainbow?

Naturally, this girl was called by Lao Guo to take care of Yang Kaiqu because of her low level of confidentiality.

So Xu Yun once again enjoyed the treatment of a boss pushing a cart.

"Xiao Han, speaking of which, this is your first time in the Seventh Branch Factory, right?"

After entering the factory area.

While pushing Xu Yun's wheelchair, Lao Guo pointed to the black shell-like factories around him and said:

"How is it? Does it feel a little different from the theoretical research center you imagined?"

Xu Yun was silent for a moment, then nodded lightly:

"Well, it's a little different."

Although Xu Yun once visited Xihai Atomic City in reality, as a themed commemorative scenic spot, the overall appearance of later generations of Atomic City is actually very different from the current 221 base.

A considerable number of objects in the Atomic City have been transported to the museum, and many buildings have been abandoned or even demolished.

Therefore, Xu Yun did not see the situation of Lu Guangda's Theory Department with his own eyes. The picture he originally conceived should be like this:

Several small buildings with two or three floors gathered together. The outer walls of the buildings are a bit dilapidated, but there is no sense of desertion. There is a yellowish stone road in front of the door, and there are some vegetation and flowers beside the road.

Whenever the sun shines, it flicks through the leaves, forming mottled shadows, which are elegant and long.

Unexpectedly, Xu Yun found out after seeing the actual situation.

The painting style of the Theory Department is more simple than he imagined.

But when you think about it, it's normal.

After all, in the original history, U2 across the sea would come to harass almost every once in a while.

As the focus of attention, all abnormal buildings in Factory 221 will be strictly guarded.

Therefore, for the theory department, the lower the profile, the better.

Immediately afterwards.

Lao Guo quickly brought Xu Yun to a workshop that looked ordinary even among the many 'iron boxes', and knocked on the door lightly a few times.

Boom——, boom boom boom.

Obviously one long and three short.

After about a few seconds.

The peephole of the workshop door was pulled open a little, and a pair of vigilant eyes appeared behind the door.

After seeing Lao Guo's face clearly.

crunch——

The door was opened from the inside.

A man in casual clothes with a serious expression appeared, and on his left stood two soldiers with semi-automatic rifles:

"Director Guo, you are here."

"Well, there are some things on Guangda's side that I need to deal with."

Old Guo nodded to him, then pointed to Xu Yun beside him and said:

"Old Zhou, this one doesn't need my introduction, does it?"

The middle-aged man named Lao Zhou was not tall, and he looked serious. His face was even more serious than the Cheng Kaijia that Xu Yun had seen before. Or smelly.

Xu Yun had never seen this person at the base executive meeting, but judging by Lao Guo's manner of speaking, the reason why this person did not appear at the meeting was probably not because of insufficient rank, but because of the need for confidentiality.

Then Lao Zhou's eyes scanned Xu Yun.

Just when Xu Yun thought that Lao Zhou would let him go, Lao Zhou suddenly stretched out his hand and tore open a small scar on Xu Yun's face.

A sharp pain instantly made Xu Yun grin his teeth:

"Fuck, pain, pain, pain"

However, Lao Zhou carefully observed the faintly bleeding wound under the scar, and then took a few glances at Xu Yun's trousers.

After making sure everything is working and not faking it.

Just now he nodded reassuringly and stepped aside:

"No problem, you can go in—Comrade Han Li, the confidentiality regulations require it, please forgive me."

Xu Yun twitched the corners of his mouth twice:

"Understand understand."

Then under the guidance of Lao Guo.

Xu Yun finally entered the workshop.

This workshop is about the same size as the indoor gymnasium of an ordinary high school in the later generations. From the outside, it looks like a warehouse with a medium volume, but the internal structure should be very simple.

However, after entering the workshop, Xu Yun realized that the workshop was far from being as simple as it seemed.

because

What appeared in front of Xu Yun after entering the workshop was not an upward staircase or a horizontal floor, but a

A downward walkway.

That's right, down the aisle.

In other words.

The basement of this workshop is empty.

Perhaps it is to facilitate the transportation of some materials or instruments. There is a very primitive elevator on the side of the aisle—or it should be called a lifting platform.

Then with the help of this thing, Xu Yun and Lao Guo came to the place smoothly.

basement one.

This underground facility has a painting style that is very different from the current period. The walls are painted with a smooth layer of soil that Xu Yun can't recognize, and the floor is a standard self-leveling ground.

If it weren't for the lighting facilities still using some old tungsten bulbs, Xu Yun even felt that he had traveled back to 2023.

Afterwards, Lao Guo led Xu Yun around, and finally came to a house numbered [Special 01].

this time.

Lao Guo didn't knock on the door with a signal of a specific frequency as he did before entering the workshop, but pushed the door open and walked in.

With the door pushed open.

next second.

A noisy voice came to Xu Yun's ears:

The first is the crackling abacus knocking sound, this irregular but very crisp sound is very conspicuous anywhere.

When he heard the sound of the abacus, Xu Yun suddenly remembered something.

In the year 2023 he travels through, a statement can often be seen on the Internet:

The abacus did not play much role in the development of nuclear weapons. It is just to highlight the hardships of some "heroes", which belongs to the expression method of the movie.

This statement is simply ridiculous.

Whether it is the memoirs of big figures such as Yu Min and Qian Wushi, or in the official documentaries, you can see the repeatedly mentioned abacus.

According to the old man's memory.

The more than 30 people in their light nuclear team alone consumed more than 200 abacus in five years.

Indeed.

It is very troublesome to use an abacus to calculate partial differential equations and various functions, but the question is, do they have options in this era?

The computing power of the 103 machine is only more than 10,000 per second, and there are only 47 hand-operated computers shared by more than 5,000 scientific researchers in the entire base. What do you use without an abacus?

It's not that the rabbits are far away, but that there is only such a condition in that era.

After the rabbits have finally worked out the results, some people will turn into chicken soup for fooling people. Isn't this a big joke in the world?

Nowadays, some people on the Internet find that the existence of the atomic bomb cannot be erased, so they start to play down the hard work of those predecessors. A certain Douyin account even made a statement like [Rabbit had the most powerful computer in the world at the time].

It is estimated that in a few years.

Maybe there will be comments on the Internet that the rabbits plugged in the RTX 4080 while eating big fish and meat to make nuclear weapons. The outrageous thing is that some people will believe this kind of statement?

The line of sight returns to reality.

And besides the sound of the abacus.

Then came various discussions:

"Old Hou, I don't count paper here, can you lend me some?"

"Brother Cheng, can you help me see if there is anything wrong with my result?"

"Anyone who wants to go to the bathroom together?"

"Liu Gong, is this range too big? I think 0.3324 should be enough."

There are about thirty people in this room, and the area is about the same size as two ordinary high school classrooms in later generations.

This is actually the second time Xu Yun has seen a group discussion - the last time was in the Zhuxianjian team to calculate the waverider. In fact, Xu Yun has always had a question in his mind that is quite puzzling:

In such a noisy environment, is the calculation result really infallible?

At least when Xu Yun was calculating the questions, he still had high requirements for the surrounding environment.

In some cases, he even wears 3M earmuffs, although these things are not friendly to people with big heads.

But so far it seems.

This kind of environment is not a big problem for the predecessors of this era, and some people even like the noisy feeling.

And in this noisy atmosphere.

There is one orientation that is extremely conspicuous:

This moment.

A large group of people were gathered around a table at the right rear of the room, discussing something heatedly among themselves.

It is not difficult to see from the thin foreheads of each of them that this must be a discussion between the strong.

Then Lao Guo closed the door and led Xu Yun straight to where the group of people were.

As the distance draws closer.

Some previously inaudible conversations gradually became clear:

"Old Hua, calm down, the neutron angular flux density cannot be so low, you must have made a calculation mistake somewhere."

"It's not that I'm agitated, it's that you are targeting me! My answer is clearly correct!"

"Old Hua, everyone has known each other for so many years, who will target you? We are clearly discussing a mathematical problem, and even the values ​​of parity spherical harmonics are clearly written on the document."

"Yes, Lao Hua, you are too sensitive, you said yesterday that you want your son to marry my daughter."

"Don't f*ck talk about this, let's talk about the facts—if you mention this again, believe it or not, I will cut off my son when I go back?"

"????"

all in all.

When Xu Yun and Lao Guo came to the scene, what appeared in front of them was this scene:

About ten researchers gathered around the table, clearly divided into left and right groups, and Lu Guangda was surrounded in the circle with a helpless face.

See this situation.

Lao Guo immediately called out Lu Guangda's name:

"Guangda!"

Lu Guangda was looking at a document in front of him with frowned eyebrows, but he immediately raised his head when he heard this.

After seeing Lao Guo and Xu Yun, he was startled for a moment, then his eyes lit up, and he said with great joy:

"Old Guo, Comrade Han Li! Oh, you guys are here!"

Then under the gaze of everyone.

Lao Guo pushed Xu Yun to the table like pushing a shopping cart in a supermarket, and pouted his chin at the manuscript paper in front of Lu Guangda:

"Guangda, what's the matter?"

Before, due to the need for confidentiality, Lu Guangda only sent someone to inform Lao Guo's theoretical team of some situations encountered here with concise content, which was roughly related to neutron transportation, but Lao Guo would not understand it no matter how much it was.

Lu Guangda sighed when he heard the words, and explained to Lao Guo:

"Old Guo, do you still remember the set of foreign periodicals you brought back?"

"There is a document that Comrade Changyou brought out from the Los Alamos National Laboratory. In addition to some important parameters, the document also describes a critical state model of a steady state."

Lao Guo nodded heavily:

"of course I remember."

How could he have forgotten this?

After all, this document is his best friend, a top-secret document bought with his life

Then Lu Guangda paused, and continued:

"After translating this document, we immediately carried out the whole group study and discussion, and we did produce very good theoretical results not long ago."

"These theoretical achievements have pushed our research efficiency by a large margin, and many places that were stagnant have also begun to loosen."

"It was only during the follow-up calculation of the neutron flux density that we suddenly discovered a situation."

Speaking of which.

Lu Guangda looked up at Lao Guo, and picked up a document from the table:

"According to our subsequent derivative calculations of the model, we found that there are obvious anomalies in some calculation results."

Old Guo frowned when he heard this, took the document and read it.

after awhile.

He couldn't help but let out a light sigh between his nostrils:

"Well?"

Neutron transport equation.

This is a very, very important module in the development of the atomic bomb.

Students who were atomic bombs in their previous lives should know this.

The probability of neutron-nuclei collisions during a nuclear explosion is a complex process—both applied and computationally.

At the beginning, the atomic bomb was bombarded, and then neutrons were exploded.

During neutron propagation, new nuclei are encountered and new neutrons are emitted.

These neutrons will randomly move in different directions, collide again, and so on

Such a round-by-round process must be mathematically accurate to the state of motion of the neutrons in each round.

Described in terms like this:

A neutron initially at one location in the stack with one energy and one direction of motion will, at a later time, move to another location in the stack to emerge at another energy and another direction of motion.

This trajectory is represented by a set of mathematical equations, which is the neutron transport equation.

but the problem is

The energy distribution of neutrons produced after the chain reaction is very wide, and it is necessary to solve many groups of Boltzmann equations, and there is no analytical solution for this stuff.

so what.

Numerical solutions can only be obtained through a variety of calculation methods after being discrete. The shape of the nuclear fuel in nuclear weapons is also relatively complicated, so it is more difficult to solve.

The computing power of later generations is strong, and the calculation of this problem can be directly calculated by Monte Carlo.

But in this era, we can only solve the single-group neutron transport equation by hand, which is very troublesome.

But you can't solve this problem, because without a specific single solution, many operations on the application cannot be performed.

For example, where are the control rods inserted?

How does highly enriched uranium reach critical volume?

What is the proper fuel placement?

Without specific values, these things cannot be done.

Therefore, when he got the documents from the Los Alamos National Laboratory, Lao Guo was both sad and happy.

The grief is because the process of obtaining this document was too bumpy, and more than one comrade-in-arms died during the escort.

I am happy because with this document, many difficulties should be solved smoothly.

But now it seems.

This matter is far from simple.

For example, the calculation manuscript in his hand, this is a very standard calculation process of general values.

That is, when the mean free path of the particle is very small.

Solve the discrete ordinate under the diffusion condition by the optical thick cell cavity. That is, the value of a module in the atomic bomb application process.

The form of the transport equation is as follows:

ut+bu=0

Here u=(x,t),

where the time variable: t≥0 .,

Spatial variables: x=(x1,.,xn)∈Rn.

Auxiliary vector: b=(b1,.,bn)∈Rn, this is a fixed vector..

Then on the boundary Γ:Rn×{t=0}, given the initial value, g:Rn→R.

Observing the above equation, it is not difficult to find that the derivative of u along a certain direction is 0.

At this time, fix an arbitrary point (x, t), and define z(s)=u(x+sb, t+s), s∈R.

Using the equation at the beginning one can get an expression:

dz(s)ds=bu(x+sb,t+s)+ut(x+sb,t+s)1=0.

It is not difficult to see from this expression.

For each point (x, t), u is a constant on the straight line passing through (x, t) and the direction is (b, 1), which is actually its initial value at t=0.

Then add a value-added term of the diffusion equation, and it is easy to get a result that the exponent term is a positive number of e.

At least from the perspective of Lao Guo's mathematical level, there is no obvious abnormality in this derivation process.

But when he saw the result, he was instantly stunned.

Only at this moment.

On the summation of the infinite term series at the end, it shows a result that the exponent term is the negative number of times of e!

See here.

Lao Guo suddenly raised his head and looked at Lu Guangda who was opposite him.

Lu Guangda helplessly spread his hands towards him, and sighed:

"See, isn't it weird?"

Lao Guo pondered for a moment, continued flipping through the manuscript in his hand a few times, and asked:

"Guangda, is it possible that there is a problem with the calculation of the earlier data?"

"Impossible, absolutely impossible!"

Lao Guo just finished speaking.

The middle-aged man who was the best with everyone before became excited again:

"At first, I thought it was a problem with the pre-data, so I led the team to recheck it three times! It even took an hour of calculation time for the capital computer!"

"But no matter how you calculate it, all the pre-conditions meet the requirements of the simulation on the Los Alamos National Laboratory file."

"So there must be something wrong with the translations of your three groups! Some words have been translated into another concept!"

"Fart your mother!"

Hear this sentence from the middle-aged man.

The other is short. The middle-aged man who is only about 1.5 meters can't help it anymore. After all, there is an "outsider" like Lao Guo present at this time, and some face must be fought:

"I have studied in Britain, France and the United States, and I still study applied mathematics. It is impossible to get this term wrong with your eyes closed!"

"Don't fucking speak vernacular, it can be translated into Wenzhou dialect with confidence!"

"Then what do you say is going on?"

"This tmd asks you!"

Looking at traveling through so long.

It was the first time Xu Yun saw such heated differences of opinion in the base.

Although Lao Guo and Lu Guangda reacted quickly, they quickly asked other members of the group to separate the two and take them away to calm down.

But the atmosphere of the whole scene has dropped a lot visible to the naked eye.

See this situation.

Xu Yun on the side couldn't help blinking, and said to Lao Guo:

"Guo Gong, can you show me the arithmetic paper?"

Lao Guo nodded, and handed the manuscript to Xu Yun.

The manuscript paper was about 0.5 centimeters thick, but now that Xu Yun's hands had regained some strength, he took the manuscript paper without much effort.

"."

Although the concept of neutron transport is a related category of nuclear engineering, its essence overlaps with Xu Yun's physical direction.

So soon.

Xu Yun finished reading the calculation manuscript and vaguely had a decision in his heart.

Sure enough

Then he took a deep breath and said to Lao Guo:

"Guo Gong, I've finished watching."

At this time, Lao Guo was writing and doing checking calculations. He wanted to try to find out the problem. Hearing this, he asked without raising his head:

"Oh? How about it, any ideas?"

Xu Yun pondered for a moment, then suddenly said:

"Guo Gong, I wonder if you have considered a possibility?"

"What's possible?"

"It's not the translation or the calculation that went wrong, but the Los Alamos National Laboratory document itself?"

"."

I heard this.

Lao Guo suddenly stopped writing.

After a while.

He suddenly raised his head to look at Xu Yun, with a strong expression of astonishment:

"Xiao Han, what are you talking about?"

"You have to know that there is no possibility that this document will be leaked to us intentionally—the information in the first half of it has helped us solve many, many theoretical problems."

"That is to say, this is the result developed by the top team across the sea, and no one has tampered with it."

"And the one who made this model is Norris Bradbury, the director of the Los Alamos National Laboratory, the absolute core of the Manhattan Project!"

"He was an expert and authority on nuclear weapons, second only to Oppenheimer — Bradbury was also in charge of final assembly at the Trinity test across the sea."

"Xiao Han, do you understand what I mean?"

"I understand, it's an authoritative conclusion."

Xu Yun nodded lightly, then spread his hands out:

"But what if the authority itself is wrong?"

Note:

The reason for the previous beef is roughly known. The main reason is that the kitchen paper was not used to absorb the blood water. After using the kitchen paper, the taste is completely different.

As for the students who said I was cheated, let me explain. I bought Mayura beef. It may be expensive but the quality is guaranteed, so I don’t think I have been cheated. I don’t eat it every day when I entertain friends once in a while. I've been entertained rarely once in a few years

It's the end of the month, ask for a monthly pass