Looking at the calculation paper in Da Da's hand, Xu Yun's expression was a little subtle.
True.
In the waveform calculation of the entire explosive lens, compared with the thickness of the neutron reflection layer and the limit value of u, the difficulty is obviously much simpler than the latter.
After all, Xu Yun had assisted Lu Guangda and the others in calculating the neutron transport equation two months ago, so he had a very direct calculation tool...or rather a direction.
Immediately afterwards.
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.
Therefore, after Xu Yun pointed out relevant ideas like Wang Yuyan, 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 pretty impressive.
To know.
Even in the later generations he traveled to, a Vulcan version of 4060ti... which is the best version of 4060ti, would still take 0.135492 seconds 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)
DaZhen is indeed the legendary humanoid self-propelled supercomputer. Its computing power is truly incredible...
Chen Nengkuan on the side also seemed a little surprised by this.
Although he is more than the standard "becoming famous at a young age", he became somewhat famous in the domestic physics community when he was 24 or 5 years old.
However, 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.
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 satellite, have cooperated in a real sense to "launch 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 Yu smiled and scratched his hair, his round face full of honesty:
"It's just so so, as long as you have hands, it's fine as long as you have hands."
all in all.
The calculation results of the neutron reflection layer were released, which had a clear boosting effect on the morale of the entire team:
Now, less than half an hour has passed since the deduction began - and in the original plan, it would take at least two hours to break through the neutron reflecting layer.
In addition, Xu Yun also noticed...
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...that is, uranium-235 or its isotopes.
The lowercase u actually refers to a parameter when the explosive lens radiates implosion:
It is a 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 who took root in the Gobi and dedicated their youth in the early days of New China.
This TV series is not as well-known as "The Meritorious Service", but it is still quite good to watch. The actors Li Xiang and An Changlin from "Hurry Up" both appeared in this TV series.
Among them was a physicist named Wang Huaimin, whose prototype was Lu Guangda, who was sitting at the front and immersed in calculations.
The spherical wave to plane wave that 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.
At that time, Xu Yun discussed this matter with several friends, and 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 just 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=?12?2.
Operator H^ is essentially a second-order differential operator, and its eigensolution is a plane wave solution, that is, the solution of Hψ=epψ is ψp=12πe?ip?x,ep=p22.
This is a very basic concept in theoretical physics, even in this period.
Therefore, 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.
"Consultant Xu, I have an idea."
Soon afterwards, Cai Shaohui, who had not spoken much, raised his hand:
"How about we build an elastic scattering model? It's like two ping pong balls hitting each other."
"Then we 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 plane waves instantly form spherical waves by rebounding, thus triggering a chain reaction in one fell swoop."
This chapter is not finished yet, please click on the next page to continue reading the exciting content! However, Xu Yun quickly shook his head after hearing this and rejected Cai Shaohui's idea:
"It's not appropriate, Comrade Shaohui. Although the elastic model seems appropriate in theory... you seem to have forgotten that squares are integrable."
"Once square integrability is introduced...the elasticity model loses its meaning."
Cai Shaohui was suddenly startled.
But soon, his stunned look was replaced by another expression of understanding.
right.....
As we all know.
Take one dimension as an example.
After the wave packet composed of plane waves is drawn, 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.
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.
In this way, the elastic model is naturally denied from the root.
Actually.
In the original history, the British have stumbled in this regard.
But 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 eliminate complicated implosion calculations, he adopted an elastic model. In the end, the roller truck overturned and he lost about 200 million pounds.
You know, this is 200 million in the 1960s...
If it hadn't been for the support from the other side of the sea, John Bull would probably have had a few more falls.
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 the hanging... ahem, Dai Da:
"Greater than Comrade, what do you think... hmm? Greater than Comrade?"
What makes Xu Yun a little strange is.
At this time, Da Da unexpectedly frowned in an unusual way, 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:
"Bigger than Comrade? Are you feeling unwell?"
"ah?"
When Da Yu heard the words, he was in a daze for a few seconds, but he soon 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 was just thinking about something, I'm sorry, 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, do you have any opinion on the limit value of u?"
"The limit value of u..."
He rubbed his chin twice with his rough fingers and said thoughtfully:
"Placing the primary-secondary along the axis while ensuring that each part of the cylindrical secondary is independently compressed.... That is to say, a micro-element is cut along the long axis of the projectile. This micro-element can be calculated independently. What do you think of this design?
Sample?"
"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. The total solution is to solve the system with T steps and size M at N positions."
“Primary-secondary placed along axis?”
Then Chen Nengkuan thought about it along the lines of greater than, and added:
"In fact, we can also make some form of M*M sparse matrix to solve it, right? Wouldn't this be better than the symmetry around the axis you mentioned?"
Anyone who has taken high school mathematics should 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 speed of X-rays is 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, the additional thermodynamic parameters will naturally make it more stable...or more suitable for application.
Da Yu soon 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 or not.
Cai Shaohui, who had proposed an idea before 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 suddenly 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 need to at least promote... double-digit effects."
"I remember that the density of our explosives is 1.86g/cm3, so the explosion pressure..."
Hua Luogeng immediately picked up the pen:
"Leave it to me, Jingrun, and Lao Feng to calculate the explosion pressure. Our calculation team hasn't started working yet, and our hands are itchy to death just looking at 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, you first draw the axis, and after the explosion pressure is released, you will be responsible for calculating the parameters of the ellipsoidal confocal reaction chamber."
"Comrade Feng Kang, please help me. Let's try to find the optimal solution for sparse matrices and straight lines."
This chapter is not finished yet, please click on the next page to continue reading the exciting content! After hearing this, Chen Jingrun immediately pulled a piece of math 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 did, it would be a lot of fun...
Don't say anything else.
Just the thinking cards of Hua Luogeng, Chen Jingrun, Yu 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.
What's more important is that these are all seniors from China. If there are thinking cards, they will definitely be smoother to use...wrong, smoother.
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.
His eyes returned 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 mission!"
Xu Yun also puffed up his chest:
"No problem, I will do the job of pouring water."
After everything is ready...
The final push for the atomic bomb theory...
This officially begins!
.......
Note:
Thanks to Mr. Xuxu for the reward!
A blood vessel in the lung burst. Fortunately, the burst was a pulmonary vein and not a 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 about 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 take some. We are in urgent need of monthly passes...