"As for the current progress of the project...Guangda, it's up to you to make an introduction to Comrade Han Li."
Hearing what Li Jue said.
Lu Guangda on the side nodded calmly.
I saw him subconsciously picking up the pen in front of him, holding the tip and tail of the pen in his left and right hands, and said:
"Comrade Han Li, currently we have three main directions of research on atomic bomb theory."
"They are fluid mechanics, material properties under high temperature and pressure, and neutron physics."
"There are six groups in fluid mechanics, responsible for multi-medium radiation fluid mechanics and detonation fluid mechanics respectively."
"The person in charge of detonation fluid mechanics is Comrade Guo Youlai, and the person in charge of multi-medium radiation fluid mechanics is Comrade Zhou Yulin next to me."
Lu Guangda had just finished speaking.
A middle-aged man with a Chinese character face sitting on his right nodded slightly towards Xu Yun.
In the future life when Xu Yun traveled through time.
The four major disciplines of biochemistry and environmental materials have a very interesting name, called the four major tiankeng.
But in fact.
In addition to these four major subjects, there is another subject that is equally mysterious.
It is fluid mechanics.
Of course.
Fluid mechanics is mysterious not because of its employment prospects, but because the subject is too complex.
for example.
Fluid mechanics requires the study of continuum mechanics, which is one of the directions of physics.
Topology, mathematics, right?
The basics of mechanical design, this is an ironclad mechanical science, right?
Soil mechanics, this is the specialty of civil engineering, right?
Finite element analysis, is this a computer thing?
The mechanical behavior of materials mechanics is a special skill for everyone!
Ever since.
Those who study civil engineering think it is about machinery, and those who study mechanics think it is about dry materials.
Those who use dry materials regard it as a light-tearing instrument, and those who think of it as a light-tearing instrument feel that it is physical next door.
The one who teaches physics next door is the one who teaches mathematics downstairs, while the one who teaches mathematics downstairs tends to do computer science.
Finally, after tossing the computer, I came to a conclusion:
It is old engineering...
And that's why.
In the development process of nuclear weapons, fluid mechanics is an indispensable subject.
for example.
The development of nuclear weapons involves a lot of pressure drop calculations, resistance loss calculations along the way, and pipeline flow calculations in engineering. These are all within the scope of fluid mechanics.
There is also the entire process of material movement from detonation to target impact, which also belongs to the category of fluids.
How outrageous would this thing be if it could be cultivated to its peak?
The first leader of contemporary fluid mechanics was called Jeffrey Taylor. He once did something that went down in history:
July 16, 1945.
Across the sea, the first nuclear test in human history, codenamed "Trinity", was conducted.
Then in 1947.
In order to expand its international influence, Haidian released a set of photos of exploding fireballs.
There are 14 photos in total, and the content is the picture of the fireball from small to large.
As a result, Jeffrey Taylor relied on this picture to design a dimensionless quantity and accurately calculated the yield of the atomic bomb to be 17,650 tons...
This is evident from the horror of the subject of fluid mechanics.
If not.
Qian Bingqiong would not have thought of letting Qian Wushi be responsible for research in this area at the beginning.
Then Lu Guangda paused and continued:
"As for neutron physics, that's the area I'm responsible for - Oh, by the way, Comrade Han Li, weren't you discovered by Lao Guo and the others in Guide County?"
"The purpose of Lao Guo's trip to Guide County at that time was to retrieve a batch of foreign reference documents."
"There is some information in the literature related to the neutron equation of state, so recently there has been some gratifying progress in neutron theory."
Xu Yun was startled when he heard this.
Is there still such a thing?
After regaining consciousness.
Just now a glimmer of understanding flashed in his eyes.
I see......
He was a little strange before.
Even if the base has to go to Guide County to collect food, in theory researchers like Lao Guo should not be involved - such matters should generally be handled by comrades in the army, even comrades from the confidentiality front are more suitable than Lao Guo
.
The purpose of co-authoring Lao Guo's trip to Guide County turned out to be for those foreign documents...
Considering the international situation these days.
The value of foreign literature to the rabbits is no less valuable than the food supplied to the base.
Of course.
What Xu Yun didn't understand was.
In order to transport this batch of documents to the country, some people even paid the price with their lives.
Then Lu Guangda took a deep breath, dispelled some emotions in his heart that were not suitable for expression now, and continued:
"As for the properties of matter under high temperature and high pressure, it involves the relevant framework of nuclear fission. Comrade Chen Nengkuan is currently in charge of research in this area."
"About half a month ago, Comrade Chen Nengkuan had deduced the lower limit of the critical mass of the sphere when the density of the chain reaction is 11.61 grams per cubic centimeter."
After saying this.
Lu Guangda quickly glanced at Xu Yun and observed the 'advisor's' reaction.
He planted a certain hook in this introduction. I wonder if Xu Yun can realize that information?
Then under Lu Guangda's gaze.
A hint of 'surprise' suddenly appeared on Xu Yun's face:
"The critical mass of a sphere? Director Lu, is it possible that the base is planning to develop an implosion-type atomic bomb?"
Swish——
Xu Yun just finished speaking.
Lu Guangda suddenly looked at Lao Guo next to Xu Yun.
Upon seeing this, Lao Guo immediately shook his head:
"Lao Lu, don't look at me. I haven't said anything to Xiao Han."
"I can guarantee this with my personal party spirit. Comrade Han Li had no knowledge of our research before."
When Lu Guangda heard this, his breathing stagnated for a moment.
After a while.
The way he looked at Xu Yun immediately became different.
As we all know.
The essence of the atomic bomb is the nuclear fission of uranium.
This concept was first confirmed by German chemists Otto Hahn and Fritz Strassmann in 1938. In early 1939, Otto Hahn proposed the concept of "splitting nuclei".
It refers to the nuclear physics process in which a heavier atomic nucleus splits into two lighter nuclei of other atoms in a nuclear reaction.
during the fission process.
A large number of neutrons, beta, gamma rays and neutrinos will be produced, and huge nuclear fission energy will be released.
Theoretical calculations.
The energy released by the fission of 1 kilogram of uranium-235 is equivalent to the energy released by the combustion of 2,700 tons of standard coal. The relationship between the two is 2.7 million times.
After the uranium-235 nucleus absorbs a neutron, the composite nucleus is in an excited state and oscillates.
There are two situations as a result of oscillation:
One is that the composite nucleus is reduced from an ellipsoid to a spherical shape, and then emits gamma rays (prompt gamma rays) to release excess energy;
The other type has a large excitation energy, and the composite nucleus quickly splits into two independent nuclei.
The neutrons emitted when an atomic nucleus fission are called fission neutrons.
Then the uranium atomic nucleus is bombarded with neutrons, causing the nucleus to split into two medium-mass fission fragments, releasing a large amount of energy and 2 to 3 fast neutrons at the same time.
Under appropriate conditions.
These neutrons will be absorbed by other uranium nuclei and then cause fission, interlocking like a chain, passed down from generation to generation, forming a self-sustaining chain reaction.
This is a chain fission reaction.
The so-called atomic bomb is a nuclear weapon developed based on this nuclear fission chain reaction.
Back then, the people across the sea generously gave two of them to Neon Man, but unfortunately Neon Man was too weak to receive them properly.
Just like the Huashan Sect is divided into Sword Sect and Air Sect.
Atomic bombs are also divided into two types based on different structural principles.
One is the squeeze type, also known as the "gun type".
This type of atomic bomb uses a "barrel" device to combine two pieces of fissile material with less than a critical mass.
During the explosion of chemical explosives.
Under the high pressure generated, they quickly close together and reach a supercritical state, triggering a nuclear explosion.
And the second kind...
This is what Xu Yun calls the implosion type, also called the compression type.
Its principle is to use ordinary high explosives to make a spherical device.
Then, the nuclear charge less than the critical mass - that is, uranium-235 or plutonium-239 is made into small balls and placed in the center of the explosive ball.
Finally, through synchronous ignition of the electric detonator, each point of the explosive ball detonates simultaneously, generating a centripetally focused compression wave.
Yasuobo will instantly and violently compress the nuclear charge sphere, increase its density, make it supercritical, realize a self-sustaining chain reaction, and cause a nuclear explosion.
Compared with the compression type atomic bomb, the implosion type has significantly higher structural advantages.
for example.
The little boy given to the Neon Man across the sea was a compressed structure. The nuclear charge was enriched uranium with an abundance of about 80%. It weighed 60kg and had an explosion power equivalent to 14,000 tons of TNT.
The energy released by the complete fission of 1kg of uranium is about 18,000 tons of TNT equivalent, so the utilization rate of the Little Boy nuclear charge is only about 12%.
The other Fat Man is an implosion type structure, using plutonium produced by a graphite water-cooled uranium reactor as the nuclear charge.
Its explosive power is 21,000 tons of TNT equivalent, and its nuclear charge utilization rate is 21%.
So when they were developing nuclear weapons, the rabbits decided to develop implosion-type atomic bombs.
Of course.
This kind of thing, which is considered absolutely confidential at this stage, is not particularly difficult for future generations like Xu Yun.
In addition, Xu Yun has been paying attention to the elder's expression since Lu Guangda opened his mouth.
So after realizing the hook in these words.
He immediately chose to bite the hook.
After all, this is an act to increase one's own confidence. Having a rich reserve of other knowledge and understanding the principles of atomic bombs are two different things.
Besides, being fished by a meritorious senior like Lu Guangda is not shabby at all.
as expected.
Lu Guangda, who had just reported the situation on a routine basis before, now had a strange light in his eyes.
If it were left in ancient times.
If the history books are not accurate, there will be one more sentence: "We discussed Taoism until late at night, and slept on the same couch with our feet resting on each other."
Lu Guangda then briefly introduced some theoretical progress to Xu Yun.
Among them, there are situations that Xu Yun knew in later generations, and some are unknown.
If you want to classify the progress of atomic research.
So regardless of the application fields such as parts and explosives, the current progress of the base in purely theoretical aspects is probably...
Around 30%?
This is almost the same as the original historical progress.
Judging from the progress of decryption in later generations.
The rabbits will probably complete the basic derivation of the theory around November next year, and then complete it together with the design plan in March of the following year.
In the next year and a half, the base was almost always expanding theoretical principles into applications...that is, in the real world.
Think of this.
Xu Yun had a general understanding of the situation at the base.
Then he pondered for a moment, then raised his head and looked at Li Jue:
"Director, I have a general understanding of the situation at the base. I don't know the specific arrangements for my work in the organization..."
Hearing this, Li Jue and Lao Guo looked at each other and said quickly:
"Comrade Han Li, let's discuss this matter alone later. What do you think?"
Xu Yun was startled subconsciously.
However, when he thought about the large number of people at the scene, Xu Yun quickly understood Li Jue's thoughts:
"no problem."
Li Jue nodded slightly.
in the coming time.
Li Jue roughly allocated various business plans for the base for the next week.
For example, there is a new movie arriving at the base, which is "The Monkey King Three Fights the Bone Demon" produced by the Tianma Film Studio in Shanghai.
Today, the base's cinemas have limited capacity, but there are more than 10,000 employees in 18 factories, so the distribution of movie tickets must be properly arranged.
Another example is that a new batch of cold medicine has arrived at the base, and each factory has to fight for quotas.
Fortunately, this was not the first time Li Jue and Lao Guo had held such a meeting, so these issues were quickly and orderly arranged.
Two hours later.
The executive meeting adjourned.
Xu Yun then followed Lao Guo, Qian Wushi and Li Jue Wang to join Li Jue's office after leaving the conference room.
"Comrade Han Li."
After Xu Yun sat firmly.
Li Jue said straight to the point:
"Can you conjure up enough food for 10,000 people to survive the winter? - or even 5,000 people."
.........
Note:
I'm taking a day off tomorrow. The colonoscopy didn't detect any major problems in the past few days, but there aren't many things that the colonoscopy can examine, so I'm going to Fuzhou for an abdominal color ultrasound.
Tomorrow is Sunday. The hospital I chose can register online, but I don’t know if the abdominal color ultrasound department is open, so if there is no update tomorrow, it means I am doing the examination. If there is an update, I will ask for leave for the examination on Monday.