Into Unscientific Chapter 642

Chapter 642 Atomic Bomb Theory. Complete! (middle) (Thanks to Mr. Xu Xu for being the leader)

 In the basement.

 Looking at the calculation paper in Da Da's hand, Xu Yun's expression was a little subtle.

 It is true.

 In the waveform calculation of the entire explosive lens, the thickness of the neutron reflection layer and the limit value of u are obviously much more difficult than the latter.

After all, Xu Yun helped Lu Guangda and the others calculate the neutron transport equation two months ago, so he had a very direct calculation tool, or direction.

 Follow.

Chen Nengkuan and his experimental team have broken through the critical equation of a spherical nuclear bomb with a reflective layer - literally, it is not difficult to see that this equation describes the situation with a reflective layer.

Hence, after Xu Yun, like Wang Yuyan, pointed out relevant ideas, calculating the thickness of the neutron reflection layer is no longer difficult.

  But even so.

　　Being able to calculate specific results in such a short period of time is still very impressive.

To know.

Even in the later generations he traveled to, it would take 0.135492 seconds for a Vulcan version of 4060ti, the best version of 4060ti, to achieve this result.

What?

You asked Xu Yun why he knew so clearly?

 Of course it was because in later generations he had just been equipped with a 4060ti computer. (The budget increased from 2,500 to 7,000)

Greater than it is, it is indeed the legendary humanoid self-propelled supercomputer. Its computing power is really incredible.

 Chen Nengkuan on the side also seemed a little surprised by this.

Although he is not considered to be famous at a young age, he has become somewhat famous in the domestic physics community when he was 24 or 5 years old.

 However, Yu Yu's previous achievements were mainly in nuclear physics. Due to the nature of his work, Chen Nengkuan did not have much contact with Yu Yu.

  Not an exaggeration.

Today's team-up to tackle key problems is the first time that Chen Nengkuan and Yu Yu, two men with two bombs and one star, have cooperated in a real sense to “download the dungeon”.

Then he took Chen Jingrun and others to check the data again, and then confirmed that there was no problem with the values:

“Comrade Yu Min, your theoretical calculation ability is very strong. You can calculate such a complicated process so quickly - it would take at least two hours for me.”

Hearing this, Da Da smiled and scratched his hair, his round face full of honesty:

　　"Just so so, as long as you have hands, as long as you have hands."

all in all.

The calculation results of the neutron reflector are released, which has a clear boosting effect on the morale of the entire team:

Now, less than half an hour has passed since the start of the deduction - and in the original plan, it would take at least two hours to break through the neutron reflection layer.

In addition, Xu Yun also noticed that

The expressions of Hua Luogeng and Feng Kang did not change much, but there was a hint of "fighting intent" on the faces of the two young men, Cai Shaohui and Chen Jingrun.

After all, the calculation process of the neutron reflection layer is basically a one-man show for more than one person. For Cai Shaohui and Chen Jingrun, who are the same age, there will definitely be some competition.

However, Xu Yun did not point out this matter, but pretended to be ignorant and said:

“In this case, comrades, let's move to the next direction and discuss the limit value of u.”

 Chen Nengkuan also nodded after hearing this.

The limit value of u.

 The u here does not refer to the capital U, which is uranium 235 or its isotopes.

This lowercase letter u actually refers to a parameter when the explosive lens radiates implosion:

 It is the value obtained by solving a one-dimensional grid of size M for T time steps under the assumption of isotropy.

In 2019, a period drama called "The Passionate Years" was broadcast in China. It described the story of scientific researchers taking root in the Gobi Desert and devoting their youth to the early days of New China.

This TV series is not as well-known as "Meritor", but it is still very good to watch. The actors Li Xiang and An Changlin from "Crazy" both appeared in this TV series.

There was a physicist named Wang Huaimin, whose prototype was Lu Guangda, who was sitting at the front and immersed himself in calculations.

The spherical wave to plane wave he often talks about actually refers to the concept of the limit value of u.

However, the condition of anisotropy was missing in that part of the lines. This is actually a serious or imprecise mistake.

Xu Yun discussed this matter with several friends at the time, and they finally agreed that the director or screenwriter ignored this condition in order to save lines. After all, the information provider should not make such a mistake.

I guess this is like some company leaders who delete a piece of content that seems inexplicable when they look at the code and find it cumbersome. However, little do they know that the code actually relies on this piece of content to run.

The essence of the limit value of u is to use plane waves to describe the wave function of free particles.

 Free particles refer to particles without external fields, that is, V(x)=0.

 At this time, the Hamiltonian of the particle is the kinetic energy operator, that is, H^=T^=p^22=122.

The operator H^ is essentially a second-order differential operator, and its eigensolution is a plane wave solution, that is, the solution of Hψ=εpψ is ψp=12πeipx, εp=p22.

 This is a very basic concept in theoretical physics, even at this time.

 So if you want to calculate the limit value of u, you must first determine the limit scenario. That is, the model, and then you can calculate the limit value of this model.

 “Counselor Xu, I have an idea.”

 Very quickly, Cai Shaohui, who had not spoken much, raised his hand:

“How about we build an elastic scattering model? It's like two ping pong **** hitting each other.”

“Then use this to make a spherical detonation drive device to form the centripetal detonation we need, pushing the 4cm-thick neutron reflection layer to rapidly compress the uranium-235 fuel ball 3.”

“When the reflective layer and the nuclear fuel are tightly combined, all the plane waves instantly form spherical waves by rebounding, thus triggering a chain reaction in one fell swoop.”

However, Xu Yun quickly shook his head after hearing this and rejected Cai Shaohui's idea:

“Not quite appropriate, Comrade Shaohui. Although the elastic model seems appropriate in theory, you seem to have forgotten that squares are integrable.”

  “Once the square integrable elasticity model is introduced, it will lose its meaning.”

 Cai Shaohui was suddenly startled.

But soon, his stunned look was replaced by another expression of understanding.

right

 It is well known.

 Take one dimension as an example.

  After drawing the wave packet composed of plane waves, it is equivalent to a function of Gaussian distribution, which shows that the probability of the whole space is different, and the final integration will converge.

 Let's understand it from another perspective.

 The wave packet composed of plane waves is actually the Fourier transform of a certain function.

 One of the conditions for Fourier transform is that this function is absolutely integrable, so the wave packet must also be squarely integrable.

 The explosion of nuclear weapons obviously cannot be an infinitely extending plane wave model, and the locality of the position must be taken into consideration.

 As a result, the elasticity model is naturally denied from the root.

 In fact.     In the original history, the British have stumbled in this regard.

However, what they overturned was not the atomic bomb, but the higher-level hydrogen bomb.

At that time, when Aldermaston was discussing the secondary design of green granite, in order to save transportation capacity and avoid complicated implosion calculations, he adopted an elastic model. In the end, the train overturned and he lost about 200 million pounds.

 You know, this is 200 million in the 1960s

Had it not been for the support from the other side of the sea, John Bull probably would have fallen a few times.

Of course.

 Xu Yun only knew about this concept, and from now on he could only focus on watching theater.

So he naturally shifted his gaze to Gua. Ahem, Da Da:

“What do you think about being bigger than a comrade? Being bigger than a comrade?”

 What makes Xu Yun a little strange is.

At this time, Da Da unexpectedly frowned in an unusual way. He put the fingers of his left hand on the upper edge of his lips and stared at the white paper in front of him with some wandering eyes.

Xu Yun couldn't help but have a trace of doubt in his eyes.

 What's going on?

So he paused and couldn't help but say again:

 “Are you feeling unwell?”

"ah?"

Hearing this, Da Da was in a daze for a few seconds, but he quickly came back to his senses, looked around and then at Xu Yun, and waved his hand quickly:

“Oh, it's okay, it's okay, Consultant Xu, I just got lost in my thoughts. I'm sorry.”

Xu Yun didn't take it seriously when he saw this. After all, good students can have immunity, so he continued to ask:

“Comrade Yu, what do you think about the limit value of u?”

  “The limit value of u”

He rubbed his chin twice with his rough fingers and thought:

“Placing the primary-secondary along the axis while ensuring that each part of the cylindrical secondary is compressed independently means cutting a micro-element along the long axis of the projectile. This micro-element can be calculated independently. What do you think of this design?"

“Although I haven't calculated the specific value, I estimate that 80% of it is to arrange N grid points along the axis, and then solve a system of equations for each grid point according to its position.”

“It is symmetrical around the axis, so just choose a radius as the optimal solution. In total, it is to solve the system with T step size M at N positions.”

“Primary-secondary placed along the axis?”

Then Chen Nengkuan thought about it along the lines of greater than, and added:

“Then we can actually make some form of M*M sparse matrix to solve it, right? Wouldn't this be better than what you said is symmetric around the axis?”

Those who have studied high school mathematics should all know this.

 Any ray emitted from the focus will be focused on another focus after being reflected by the ellipsoid, and will travel the same distance and arrive at the same time.

 Suppose fissile material explodes from point A and fusion material is placed at point B.

Then the explosion at point A generates X-rays and shock waves. The X-rays are fast and the energy is focused to point B first, compressing the material at point B to an extremely small size (probably the trough position of the volume vibration). The shock wave just reaches point B and continues to compress, forming Fusion conditions.

 The difficulty lies in designing the time difference between the two strikes and the volume vibration period of the fusion material.

The idea of ​​​​greater than is to achieve this goal by adding an axial distribution, but Chen Nengkuan added a sparse matrix that can form a thermal balance.

Although Chen Nengkuan's idea is more complicated, having an additional thermodynamic parameter will naturally make it more stable, or more suitable for application.

Da Da quickly realized this and naturally accepted Chen Nengkuan's suggestion:

“Well, Director Chen, your idea is more reasonable than mine.”

I don't know if I was inspired.

 Cai Shaohui, who had previously proposed an idea but was rejected by Xu Yun, also came up with an inspiration:

“Director Chen, can we also consider the ellipsoidal confocal reaction chamber? Then the axes should be aligned.”

“Ellipsoid confocal reaction chamber?”

 Chen Nengkuan thought for a moment, and then his eyes lit up:

“This is a good idea, but then the explosion pressure will require further consideration—our current explosion pressure is not accurate enough, and we must at least achieve a double-digit effect.”

“I remember that the density of our explosives is 1.86g/cm3, so the explosion pressure is high.”

Hua Luogeng immediately picked up the pen:

“Let me, Jingrun, and Lao Feng calculate the explosion pressure. Our calculation team hasn't started working yet, and our hands are itching to death from working on it.”

 Chen Nengkuan has no objection to this.

 Then he took a deep breath, looked around the scene, and assigned tasks:

“In that case, Comrade Luo Geng, let me ask you and Comrade Jingrun to calculate the explosion pressure.”

“Xiao Cai, please draw the axis first, and then be responsible for calculating the parameters of the ellipsoidal confocal reaction cavity after the explosion pressure is released.”

“Comrade Feng Kang, please help me. Let's try to create optimal solutions for sparse matrices and straight lines.”

Hearing this, Chen Jingrun immediately pulled a piece of calculation paper in front of him and responded earlier than his teacher.

Xu Yunze suddenly thought of something, and his eyes quickly passed over these big guys.

I don't know if this special copy of Jade Seal will have a thinking card reward. If it does, it will be great fun.

 Don't say anything else.

Just the thinking cards of Hua Luogeng, Chen Jingrun, Da Da, Lu Guangda, Lao Guo, and Qian Wushi were enough for him to use for a long, long time.

Perhaps there is still a gap between these people and Gauss Riemann in terms of professional ability, but they are obviously much better than Dirichlet and his like.

 The more important thing is that these are all Chinese seniors. If there are thinking cards, they will definitely be smoother and smoother to use.

Of course.

This is something that needs to be considered after the dungeon is over. For now, Xu Yun still has to focus on dungeon tasks.

Looking back to reality.

 After assigning tasks to others.

 Chen Nengkuan looked at Yu Da on the side again:

“Comrade Yu Min, as for your task, you and Xiao Xu can design the columnar secondary together.”

“When all the results in our three small directions are released, we can combine them into a specific model—the next step is to calculate the limit value of pure mathematics.”

"no problem."

Yu Min nodded quickly:

 “Guaranteed to complete the task!”

Xu Yun also puffed up his chest:

 “No problem, I will do the job of pouring water.”

 When everything is ready

 The final breakthrough of the atomic bomb theory.

 This officially begins!

Note:

Thanks to Mr. Xuxu for the reward!

A blood vessel in the lung burst. Fortunately, it was the pulmonary vein that burst, not the pulmonary artery (I have always had pulmonary vascular malformations, but this is a long-term disease, so I didn't pay too much attention to it before). Otherwise, what you see today would not be an update but an obituary.

I'm going to have an operation in the middle of the month, and I'm not sure whether it will be a normal operation or laparoscopic surgery. There's no need to practice before the operation is decided, so I will save some manuscripts during this time.

 Everyone who has a monthly pass, please come and get some. We are in urgent need of monthly passes.

 (End of this chapter)

Chapter end