After listening to the plan of the person in charge on the stage, Xu Chuan looked at Qin Anguo sitting next to him with a strange look on his face.

Mass catapults, Nantianmen Plan, and the aerospace mothership were all things he talked to Wen Yuanhang a week ago.

Unexpectedly, I was directly pulled up today as a promotion.

Noting Xu Chuan's gaze, Qin Anguo turned around and smiled at him, saying, "I have to thank Academician Xu for your suggestion. After Comrade Wen Yuanhang came back, he reported these directions and developments."

"After discussing the internal meeting of the Chingmen, everyone thought your suggestions were quite good, so they made a detailed plan and used it at today's exchange meeting."

"After all, today's exchange meeting was made public. With such a large-scale report, it can attract some attention from the United States."

Xu Chuan touched his chin, thought for a while and said, "To be honest, I think the solution you made might be really feasible. In theory, mass catapults can be done."

Upon hearing this, Qin Anguo asked curiously: "What do you say?"

Xu Chuan smiled and explained: "If it were just a simple manned space flight and lunar exploration project, it was indeed not necessary to build a large mass catapult."

"After all, the spacecraft required to perform a manned spacecraft and lunar exploration project will theoretically not exceed one hundred tons."

"Even if we can't directly send a hundred-ton spacecraft to the sky at one time now, we can do it in several more times, and the amount of money will not be consumed."

"But if you want to launch large-scale lunar exploration, fire exploration, or even establish permanent scientific research and residential foundations on it, a simple and cheaper way of transportation is quite necessary."

"If you look at it from a long-term perspective, it is still a good choice to build a large mass accelerator."

Qin Anguo thought for a while and asked, "If such a project is built, how much money and time will it take? Can the current technology be achieved?"

Upon hearing this, Xu Chuan thought for a while and said, "The mass projector is generally composed of giant electromagnetic rails, or may be coils, vacuum pipes and power supply systems."

"And any of these three have great engineering difficulties. The electromagnetic rail or coil is preferably composed of superconductors. The huge superconductor requirements and corresponding low temperature requirements are almost unacceptable for the moment."

"However, as long as superconducting materials develop further, this disadvantage can theoretically be solved."

"Secondly, the engineering difficulty of vacuum super pipelines for several kilometers perpendicular also exists, but this can be built with mountains like Mount Everest. With the structural support of the mountain, this is not the most important thing."

"As for the energy supply problem, after the controllable fusion technology is solved, electricity is the easiest problem to solve."

"So theoretically, this is indeed feasible."

"As for the funding, I simply calculated that this project would start at a trillion RMB."

"But the advantage is that after it is built, the price of each launch will be quite low. With this kind of thing, aerospace activities can be carried out on a large scale in the future."

"If you are interested, I can ask someone to plan and budget for you after I go back."

Hearing Xu Chuan's budget, Qin Anguo smiled bitterly, shook his head and said, "Ten trillions, it's impossible, at least it's impossible now. It's impossible for the National Development Commission to pass a budget project of this level."

If it is controlled nuclear fusion, perhaps in a period of hope, such as when a demonstration reactor, this level of investment can still be passed. After all, China is extremely eager for energy demand, and the amount spent on fossil fuel imports every year is far more than this number.

But aerospace engineering is almost impossible.

Even if the country can withdraw so much money, it is impossible to invest it in such a project. Is it not good to use it to dig out resources on the earth? Do you have to go to space?

Why, is the iron in space better than the iron on earth?

Xu Chuan smiled and said, "Actually, compared to practicing this on Earth, I am more optimistic about practicing this on the moon."

"For the Helium III deposits that excavate the moon, due to the low gravity and airless environment, large-scale mass projectors do not require a large-scale mass projector to throw large-scale items to the earth."

Qin Anguo thought for a while and smiled, "This idea is quite special. I suggest you study it after I go back."

The two were chatting, and the exchange meeting on the stage came to an end.

Apart from the representatives of the Academy of Sciences and Science and Technology, representatives from major representatives in the aerospace field, even some private enterprises that have nothing to do with aerospace, such as Tencent, Cat Factory and other companies, also came on stage to give exchange reports.

The former mainly shares and exchanges some technologies in the aerospace field, attracting business and popularity for its own companies, etc.

The latter said that he had ideas and budgets to enter the aerospace field, or announced what satellite network plans he wanted to do.

Including Xu Chuan himself, he also came to the stage to report on the development and direction of the aerospace field at the request of Chief Qin An Guosheng.

Of course, his speeches were not very large, and he mainly focused on the field of electromagnetic propulsion.

After all, since I talked with Academician Yang Hong last time, the aerospace electromagnetic propulsion system has been his preferred aerospace engine technology.

However, his fame is here, and the direction he mentioned has been recorded by many people in the academic, industrial and even business circles.

In short, both the industry and the business community can show themselves, meet partners, etc. at exchange meetings.

More importantly, investments in the aerospace field can be tax deducted by one to two.

This is undoubtedly great news for companies that pay large taxes.

Companies like Tencent have their own demand and dependence on satellites. This time, the country has subsidized scientific research funds in the aerospace field, which will undoubtedly save them a lot of money.

This chapter is not finished yet, please click on the next page to continue reading the exciting content later! The country has also promoted the development of the domestic aerospace field through this exchange meeting.

Of course, more importantly, through this exchange meeting, the disclosure of China's goals and plans in the aerospace field will help to bring attention from Western countries led by the United States and drag the other party into the aerospace field.

In this way, we will delay the other party's research progress in the field of controlled nuclear fusion, maintain our leading advantage, expand China's influence in the international community, etc.

Today's meeting can be said to be a win-win situation for everyone present.

.........

In addition to the daytime exchange, there will be an exchange party at night for guests to get to know each other.

At the party, many people were looking for the young figure in the venue with big eyes, but everyone regretted that the person did not come to the party.

At this moment, Xu Chuan had returned to the Beihai Hotel.

For him, attending such a party is not very meaningful, so it is better to come back and study mathematics.

The research on the correlation effect and superconductivity in the multi-orbit strong correlation system has not been completed, so he has to hurry up and get it done.

After all, superconducting materials with high critical magnetic fields are the basis of miniaturized controlled nuclear fusion technology and aerospace electromagnetic propulsion systems.

In the hotel room, Xu Chuan, who had once again eliminated one method, put down the pen in his hand and looked up silently at the white ceiling.

Over the past few days, he has eliminated many different routes in succession through mathematical methods and has also tried several different methods to perform calculations.

But in the end, no good results were achieved.

However, if the problem of the study of correlation effects and superconductivity in a multi-orbit strong correlation system is really so easy to solve, it will not be a century-old problem in the physics world.

After breathing a sigh of relief, Xu Chuan looked down at the manuscript paper on the table and began to think again.

"The strong correlation system of electrons is basically based on or described from the perspective of condensed matter, but quantum chemistry can also explain this, maybe it can be tried from quantum theory?"

Staring at the manuscript paper on the table, Xu Chuan fell into deep thought.

"Strictly speaking, the single electron (average field) approximation does not mean that the interaction between electrons is ignored, but that the interaction between electrons is considered in the form of an average field, that is, the two-body operator is converted into a single-body operator through the trace with the single-particle density matrix."

"But the average field approximation does not mean no correlation. Since the wave function is desymmetric (Slater determinant), the electrons with the same spin are actually related, which is called the Fermi correlation."

"So, the correlation effect that the true missing average field approximation is the so-called Coulomb association."

"If you want to calculate this broad connection, you have to start with the specific form of the wave function. The approximate wave function used by the average field approximation Hartree-Fock is called the Slater determinant, which is the product of the single electron wave function and is then antisymmetric and satisfies Pauli incompatible."

Thinking about it, Xu Chuan couldn't help but pick up the signature pen on the table again and wrote on the manuscript:

【|Ψ>=c0|Φ> ∑i,aCai> ∑ij,abCab/ij> ···(eqn 1)】

Starting from the ground state configuration, the single-electron wave function |Φ?|\Phi\rangle|\Phi\rangle is a good approximation of the multi-body wave function |Ψ?|\Psi\rangle|\Psi\rangle, indicating that the Kulun correlation is very small.

In a weakly correlated system, the average field approximation can qualitatively describe many properties of a good system, but there are some quantitative shortcomings, and these quantitative shortcomings are due to the contribution of those excitation configurations that account for a very small proportion.

In other words, it can be promoted!

Perhaps, starting from the field of quantum chemistry, it is really possible to find a mathematical path to correlation effects in multi-orbit strong correlation systems.

Staring at the data on the manuscript paper, Xu Chuan's eyes flashed with a hint of excitement.

He might have found a breakthrough.

But I don’t know how far this mouth can make him go yet.

...........

PS: There is another one tonight, please give me a monthly ticket!
Chapter completed!