Into Unscientific

"."

Da Yu's action of putting down the pen naturally did not escape the cold eyes of a certain person, so Xu Yun quickly approached him and asked:

"Da Da, have you designed the columnar secondary structure?"

Hearing this, Da Yu nodded to him, pointed to a piece of manuscript paper on the table and said:

"Well, fortunately, I finally got it done."

Xu Yun quickly looked at the paper.

I only see this moment.

A diagram of a cylindrical low structure was clearly drawn on this paper, with a large number of detailed parameters written on the corners.

For example, T=114.514, FER=0.0067, etc.

While Xu Yun was looking at the calculation paper, Yu Da also took the initiative to introduce:

"Consultant Xu, my idea this time is mainly based on the micro-element method, and I designed some points that are not perpendicular to the axis."

"In this way, the columnar secondary can just carry spherical uranium-235 with a density of 18.75g/cm^3, without wasting even a gram of material."

"In addition, I also considered the influence of the expanding gas. The total weight of the cylindrical secondary is 64kg. It is separated when it is not detonated. The hollow uranium block is located at the tail of the bomb, and is equipped with smokeless explosives. That is, nitrocellulose."

"A solid uranium block is located at the head, and 10 polonium_beryllium neutron sources are fixed around the target. Each neutron source contains 0.2 mg of polonium-210 and is cased in beryllium metal."

Under Da Da's introduction, Xu Yun quickly understood this diagram.

After all, as mentioned earlier, he really didn't understand the design aspect, but he could still understand the finished product pictures to some extent.

how to say

The design is quite bold compared to this size.

For example, in some aspects of the design, the materials used were exactly the same as the calculated parameters, without even a single gram of excess margin - this shows that he is very confident in his calculation results.

However, as the saying goes, people with great skills are bold and have greater abilities here. It is completely reasonable to come up with this kind of design.

Anyway, at least from Xu Yun's perspective, he really couldn't find any obvious problems.

Besides, there are big bosses like Lu Guangda present at the scene, so if there is anything unreasonable, it will definitely be discovered.

Xu Yun then returned the manuscript paper to Da Da:

"Greater than, the structure is very reasonable, I can't find any problems."

Yu Da laughed twice in a very honest way, and then asked as if he remembered something:

"By the way, how is everyone's progress?"

When Xu Yun heard this, he raised his chin on the table:

"Well, they're all there, I'm just missing you."

Yu Da subconsciously turned his head to look at Chen Nengkuan and others.

as expected.

At this time, Chen Nengkuan, Chen Jingrun and others had already completed their respective tasks. There were piles of documents placed in the center of the desktop, and he was the last person to complete the task.

See this situation.

Da Da couldn't help but scratch his hair:

"Director Chen, I'm sorry, I'm in a bit of a bad mood today."

But before he could finish his sentence, he was interrupted by Chen Nengkuan:

"Comrade Yu Min, it goes without saying that we should apologize. Everyone is in a bad state sometimes. If we have to apologize because our state is good or bad, then our base can't bow here and there every day like it's a small day?—— There are more than 10,000 people in our base."

"We all work for the collective. As long as we are not deliberately lazy, what's the point of worrying about whether it's early or late?"

Xu Yun also nodded in agreement.

This is the truth.

Then Chen Nengkuan directly brushed off the topic and picked up a piece of math paper from the table:

"Okay, let's turn our attention to the topic."

"The three stacks of files here are the data we calculated, which are the parameters of the ellipsoidal confocal reaction cavity, the sparse matrix and the linear optimal solution."

"What we have to do now is to combine them together into a model with u limit values."

Da Da, Chen Jingrun and others suddenly had serious expressions:

"clear!"

Then several people quickly put together several documents and performed numerical calculations.

And here we are.

What Yu Yu et al. faced was just a simple mathematical problem, which was much simpler than the previous theoretical derivation.

Of course.

Simple being simple, Xu Yun still didn't participate.

Again.

He is not a scholar in the field of atomic energy. The content discussed by Chen Nengkuan and others is basically the same as what many readers thought when they read his book when he wrote novels in his previous life.

He is pretty good at math, but in front of four people who are bigger than Chen Jing, Runhua, Luo Geng and Feng Kang, he is just looking for abuse.

So Xu Yun once again acted as a mascot, watching the excitement with an OvO expression.

"The parameter expression of the ellipsoidal confocal reaction cavity conforms to the radial long ellipsoid function, so the Fresnel coefficient of the resonant cavity should be... Oh, 0.763."

"The sparse matrix is ​​so small? Director Chen, have you verified it?"

"Well, it has been verified. The mathematical reason is that the product of the Hermitian polynomial and the Gaussian function is too small. The physical situation is because the central field of the mirror is the strongest. When leaving the central field, it will decrease exponentially as the radius increases."

"I see."

"By the way, is there any way we can make this hole bigger? Use a thicker and harder carrier to poke it in, so that the ejected neutrons can fly farther and even hit the end wall of the cavity."

More than an hour later.

Swish swish——

Da Da, Chen Nengkuan, Chen Jingrun and others wrote a value on the calculation paper at the same time:

【u(max)=256.923834】

This is it.

The limit value of u!

Combined with the thickness of the reflective layer that is greater than previously calculated, Xu Yun and Chen Nengkuan's team today's task.

This is officially completed!

Chen Nengkuan then handed these calculated parameters to Lu Guangda, who summarized them himself.

Xu Yun noticed that the speed of their group was actually quite fast. When Chen Nengkuan submitted the manuscript, about half of the group was still calculating.

But it’s normal when you think about it.

After all, although the topics their group is responsible for are difficult, the configuration is also high.

Then Xu Yun and the others waited for another two hours. When the time came to 3:30 in the afternoon, all the groups finally handed in their results.

"."

Lu Guangda quickly stood in front of the original blackboard again, holding the manuscript paper submitted by everyone (the summary page) in his hand, took a deep breath, and said:

"Comrades, with everyone's unremitting efforts, our eleven groups today have all submitted their answers."

"Now what we have to do is connect the dots and while optimizing our theoretical model of the atomic bomb, we also try to troubleshoot possible errors in each group."

"Then we will implement changes now and strive to accomplish all the results in one battle!"

Swish——

Lu Guangda just finished speaking.

Most of the theory team members in the room subconsciously sat upright.

All his efforts were accomplished in one battle.

These six words have an inexplicable impact and attraction for the entire project team.

If the theoretical research on the atomic bomb is like a football match, then the time the project team is currently in is the last few minutes of stoppage time, and the score is an extremely subtle 1-0.

At this time, the theoretical team has a certain degree of lead, but the enemy's offensive is still strong and may come back at any time and drag the game into overtime.

But as long as they survive this final impact, they can win this game.

Then under everyone's gaze.

Lu Guangda picked up the chalk and wrote one word on the blackboard:

【untie】.

Then Lu Guangda wrote down the pioneer nuclear concentration parameters calculated by the team led by "Comrade Taiping":

1nh∑i=Ni1nK(xxih)+ri^h(x).

This is a kernel density probability density function in a normalized state. Ni is the number concentration in the i-th interval, and ri is the upper bound of the dry particle size in the i-th interval.

Next is the boundary of laminar flame, which is a system of simultaneous equations:

tU+UU+xP=0

δμδ(x)=5.0νxV∞.

When he saw this set of equations, Xu Yun's eyes flashed subconsciously.

The boundary of laminar flame is actually a very interesting problem. It can be traced back to the German scientist Prandtl. Prandtl proposed the boundary layer theory, which laid the theoretical foundation of "no slip of fluid on solid surface".

However, many people in later generations, especially oil people, misunderstood Prandtl's boundary layer concept and always believed that the fluid in the boundary layer could not flow, which became the reason for the existence of the starting pressure gradient.

Of course.

The above content is not what Xu Yun cares about. The main reason why he has this expression is because...

In his previous life, he wrote a novel called "Where Are Wu Fan Going?". The book mentioned that there was a special kind of flame in the Great Mo Realm. The theoretical template he designed for this flame at that time was actually based on this set of equations.

Seeing this, some smart students must have understood it.

That's right.

In Xu Yun's original plan, that kind of flame could be used to conduct controllable nuclear fusion.

Unfortunately, due to force majeure, the fire was blown away in the wind.

Xu Yun then brought his mind back to reality and continued reading.

After writing the boundary equations of laminar flames, Lu Guangda wrote down several other formulas or parameters, including the values ​​calculated by Yu and Cheng Neng Kuan.

Lu Guangda wrote eloquently like this for more than ten minutes before he finished all the writing on the blackboard.

It is worth mentioning that.

Lu Guangda should have sorted many manuscripts before writing, so the parameters or conclusions he wrote could just be connected into a complete context.

"alright!"

Then Lu Guangda patted the chalk dust on his hands and said to everyone in the audience:

"The results of each of our groups are almost here. Now let's derive the final ZND model step by step."

"If you have any questions during the whole process, you can raise them at any time. You don't have to worry about affecting the rhythm. If there is no problem, I will start now."

There was a burst of responses or nods from the audience.

Upon seeing this, Lu Guangda picked up another piece of chalk and drew a line under the pioneer core concentration parameters:

"Let's start with the precursor core concentration parameter, which is also the starting line for all steps."

"Comrade Taiping's idea is to start with orthogonal normalization and perform Fourier transform under the condition of absolute integrability. After all, the continuous spectrum function itself has no physical meaning."

"But such normalization is not Lorentz invariant, because the 3-dimensional delta function in the momentum space has the dimension of volume, and Lorentz contraction will occur under the transformation of the reference system, so a proportional coefficient of the single particle state must be introduced."

"Assuming that this particle is P and the field strength inside the atomic bomb is E, then the single-particle state under relativistic correction can be deduced." (I refer to page 46 of Mr. Gu Qiao's Mathematical Physics Methods for this part. After all, the real I don’t have access to the data)

ten minutes later.

Lu Guangda once again put down the half-written piece of chalk and said to the audience:

"Comrade Taiping's derivation process is almost like this. Do you have any objections?"

Including Yu Yu and others, most members of the theory team in the audience shook their heads.

The few who didn't shake their heads didn't express their opinions aloud, obviously they couldn't find any problem.

Lu Guangda was not too surprised by this. After all, this is a derivation with a relatively fixed thinking or direction. Basically, there will be no big problems in group discussions.

So he paused and continued:

"The second one is the laminar flame boundary equation set responsible for Comrade Wang Aifang's group. The initial template is the Bunsen burner."

in the subsequent time.

Lu Guangda spent four hours introducing and analyzing the results of many groups, during which many expected situations also occurred.

Some team results are a standard pass, and no one from Lu Guangda to ordinary project team members has any doubts.

Some group results have caused considerable controversy, and this part is divided into two categories:

After the debate, it was discovered that the original data was OK, and after the debate, it was agreed that the original data had major loopholes.

Among them, the latter accounted for three of the seventeen results of the eleven groups (some groups were responsible for multiple topics, such as a group larger than theirs). The number was not too much, but not too much.

no way.

Except for the first two steps when the rabbits were engaged in nuclear weapons development, they were barely able to get help from others. The rest was just trying to cross the river by feeling the stones, and they had to rely on themselves to make all the theories behind closed doors.

Under such circumstances, it is inevitable that some problems will arise, not to mention that what everyone is discussing today is still the last hurdle.

Just like the football match mentioned before, in injury time, it is completely normal for a team to have one or two cramped players.

Therefore, at this time, everyone did not criticize or put pressure on them, but united and stepped forward to help their comrades.

During this period, there was even a situation where Team A pointed out a loophole in Team B, and Team B found an unreasonable problem in Team A. Everyone laughed it off.

Finally, when the time came to eight o'clock in the evening.

Lu Guangda suppressed the desire to yawn, rubbed his red eyes with the back of his hand, and said to everyone:

"Comrades, the theory of the thickness of the neutron reflection layer and the maximum limit value of u calculated by Comrade Chen Nengkuan and his team is as shown on the blackboard. Does anyone have other opinions on the derivation process?"

Lu Guangda responded with a neat shaking of his head.

See this situation.

The corners of Lu Guangda's mouth suddenly trembled slightly, and an inexplicable brilliance burst out from his eyes:

"In that case, we can proceed now"

"The atomic bomb is finalized."

Note:

The fan value title has been opened. There are thirty this month. Leave a message in the comment area and you will have a chance to get it.

I will go to Fuzhou tomorrow for hospitalization and may take a day off.