Rebirth of science and technology academic master

The influence of the quasi-Riemann Hypothesis academic seminar continues to grow, with more and more mathematicians coming forward to acknowledge the results of the paper.

Regarding the questions of some mathematicians, some of the world's top and world-class mathematicians have provided explanations. After all, although the report did not answer all the questions and doubts in everyone's mind, many problems are actually solved by the world's top and world-class mathematicians. In everyone's eyes, it's not a problem, it's just that others haven't reached their academic level yet, so they don't understand it.

However, it is estimated that it will take several months, or even more than a year, to gain unanimous recognition from the mathematical community.

Qin Yuanqing had to leave the school affairs to Xu Jiayi, and then came to a secret base. He had been to this secret base before, and it specialized in aerospace engineering research. Aerospace engineering is the top technology, full of technical content, and the world's The only countries that have the ability to send people to and from space are the United States, Russia and China. Other countries, not even the European Union, have the capability.

One can imagine how strong China's confidentiality regarding aerospace engineering is!

This time he came because of Chang'e 4!

The Chang'e Project is a lunar exploration project officially launched by China in 2004, and is named 'Chang'e Project' after the ancient Chinese legend of Chang'e flying to the moon. The Chang'e Project is divided into three stages: "unmanned lunar exploration", "manned lunar landing" and "establishing a lunar base". On October 24, 2007, "Chang'e-1" was successfully launched, representing China's substantial step in the "unmanned lunar exploration" phase.

"Chang'e 2" was successfully launched by the Long March 3C carrier rocket from the Xichang Satellite Launch Center on October 1, 2010, and successfully entered the Earth-moon transfer orbit. Chang'e 2 completed a series of engineering and scientific goals. Data such as three-dimensional images of the lunar surface with a resolution better than 10 meters and lunar material composition distribution maps were obtained. On April 1, 2011, the Chang'e-2 expansion test was launched, and it completed orbiting the Sun-Earth Lagrange L2 point for deep space exploration and other tests.

As for Chang'e-2, Qin Yuanqing had participated in it before. According to his calculations, Chang'e-2 is becoming an asteroid in the solar system, orbiting the sun in an elliptical orbit. It is expected to return to the vicinity of the earth around 2020, and then undergo an orbit change. , under the control of the ground control center, finally landed on the NMG grassland.

As for "Chang'e-3", it is China's first unmanned lunar probe with a soft landing on the moon. The Chang'e-3 probe consists of a lunar soft landing probe and a lunar surface patrol probe (the Lunar rover). On December 2, 2013, it was launched into space by the Long March 3B carrier rocket at the Xichang Satellite Launch Center in China. On the 14th of that month, it successfully soft-landed in the northwest of the lunar Mare Imbrium. On the 15th, it completed the separation of the landcraft rover, and successively carried out " "Observing the sky, looking at the earth, and measuring the moon" scientific exploration and other scheduled tasks.

"Academician Qin, I have to trouble you to take time out of your busy schedule to come over!" Academician Ouyang, chief scientist of the Lunar Exploration Project, shook hands with Qin Yuanqing and said slightly apologetically.

"Academician Ouyang, wasn't Chang'e-3 progressing very smoothly before? Did it encounter any difficulties?" Qin Yuanqing asked curiously.

Chang'e-4 is actually the backup satellite of Chang'e-3. It is based on Chang'e-3 and further conducts lunar exploration around the moon. The main mission is to follow the landing of Chang'e-3 on the lunar surface, continue to conduct deeper and more comprehensive scientific exploration of lunar geology, resources and other information, and improve the lunar archives.

It stands to reason that as long as the policy of Chang'e-3 is followed, there will be no problems with Chang'e-4.

In terms of aerospace engineering, China has always been steady and steady, not greedy for credit and making rash advances. Even in the face of rumors from the outside world, China has carried out the work in an orderly manner according to its own steps, and has achieved great results over the years.

According to Huaxia, China's aerospace engineering is not a race against any party, nor is it a competition, but China has a very unique sentiment towards the starry sky since ancient times, and we are adhering to tradition to carry out aerospace engineering. It will not be irrational behavior like the Cold War.

Through iris authentication, we came to the detector, where some engineers were installing some equipment on the detector.

Academician Ouyang looked at the ten-meter-high detector and said with a smile: "Chang'e-4 is indeed the backup machine of Chang'e-3. The designs of the two are almost identical. However, after Chang'e-3 was launched a few years ago, , successfully landed the lunar probe on the lunar surface, and released the Yutu lunar rover to conduct lunar rock exploration, successfully completing the mission."

"It stands to reason that the existence of Chang'e 4 as a 'stand-in' does not have much significance, but the China National Space Administration is unwilling to dispose of this behemoth that cost hundreds of millions as waste. So after some discussion, we It was proposed that the content of lunar exploration is different from that of Chang'e-3, that is, Chang'e-4 landed on the far side of the moon!"

The moon is very interesting. One side always faces the earth, which can be observed from the earth through a telescope, but the other side, the back side of the moon, is never completely visible from the earth. The characteristics of the two hemispheres of the moon are significantly different. There are many huge maria on the front side; the other side was hit and has dense craters. Only a small amount, about 2.5%, is covered by seas. In comparison, the maria on the front side are covered by seas. The area covered is as high as 31.2%.

Therefore, many astronomers joke that the moon is the earth's peacekeeper, protecting the earth and blocking a large number of extraterrestrial meteorites to prevent life on earth from being attacked by extraterrestrial visitors, which is why life on earth exists today.

It is undoubtedly much more difficult for Chang'e-4 to land on the back of the moon than Chang'e-3 to land directly on the front of the moon.

"There are such big changes, just in case, for safety reasons, so we need to trouble Qin Yuanqing to come in person and help us plan a soft landing route." Academician Ouyang said: "From the lunar flight orbit to the official landing The lunar surface and this environment are the core and top priority of the entire lunar exploration program. Once it fails, it means that hundreds of millions of dollars of investment have been wasted."

Aerospace engineering is extremely expensive and cannot be afforded by ordinary countries. For example, a detector like Chang'e-4 costs hundreds of millions and contains many advanced technologies. And as long as there is an error in one of the links, it will be completely wasted, and the risk is very high.

Many people accuse aerospace engineering of wasting people and money, but they actually don’t know that aerospace engineering seems to be just a waste of money and has little output, but in fact its returns are extremely amazing. The return of aerospace engineering is not its specific output, but its influence, including social influence, building national self-confidence and national pride, promoting scientific progress, etc. For example, Wu Weiren, chief designer of the lunar exploration project, said that 80% of my country's more than 1,100 new materials were developed under the guidance of space technology, and 2,000 space technology achievements have been applied to various fields of the national economy, such as satellite communications and navigation. , weather forecast, etc.

According to scientific research, the direct input-output ratio of China's aerospace industry is 1:2, while the radiation from related industries can reach 1:8~1:14, which means that every 1 yuan invested in the aerospace field will generate 8~14 Yuan return.

Aerospace engineering seems far away from ordinary people's lives, but in fact, it has already flown into ordinary people's homes and changed our lives, such as diapers, air-cushioned shoes, dehydrated vegetables, etc., aerospace technology such as liquid-gas separation, air pressure, and food dehydration. Application to life.

Qin Yuanqing is also very supportive of aerospace engineering. In fact, the Aerospace School of Shuimu University not only trains students, but also participates in scientific research tasks of aerospace engineering and contributes to China's aerospace engineering.

There are also many Shuimu people involved in various fields of China's aerospace engineering.

After understanding the mission and concept of Chang'e-4, Qin Yuanqing understood that in fact, Chang'e-4 and Chang'e-3 were similar. They both belonged to the second step of "circling, landing and returning" in the lunar exploration project, and they were not like Chang'e-4. Chang'e-5 is the third step. It not only needs to land, but also needs to return!

The difference is that the detection instruments used by Chang'e 4 are more advanced, and the soft landing site is not on the front of the moon, but on the back of the earth.

Qin Yuanqing obtained a complete set of basic information. Compared with the original, after so many years of lunar exploration, China has also accumulated a lot of technology and related achievements, and knows more about the earth, the moon, and the relationship between the earth and the moon.

Qin Yuanqing must also launch the probe, orbit the earth, jump from the earth to the moon, orbit the moon, and land on the moon softly after landing on the preparatory orbit.

In this process, because the affected force, its own mass, and speed are different, the calculation basis will also change greatly. For example, after Chang'e 4 enters the landing preparation orbit, it needs to perform a powered descent at the perilunar point on the far side of the moon. The entire power descent process will be divided into six stages, namely the main deceleration stage, the rapid adjustment stage, the approach stage, the hovering stage, the obstacle avoidance stage, and the slow descent stage.

Six stages, that means six different sets of system parameters are required.

It is conceivable that the computational workload is simply unimaginable.

Moreover, other staff could only learn about this matter and could not help Qin Yuanqing much. The entire calculation workload, including modeling, had to be carried out by Qin Yuanqing.

As for this calculation, much of the existing knowledge in the aerospace field and mathematics does not exist at all and is blank. Qin Yuanqing needs to create it. Instead of teaching it bit by bit, it is faster to do it himself.

After it is done well, others will research, analyze, and learn based on the results.

Qin Yuanqing also didn't have time to be a teacher and spend months or even years teaching this large number of students.

The result is that Qin Yuanqing is like a workaholic. There are a large number of highly educated researchers in the lunar exploration project. There are many Ph.D.s and even many academicians. As a result, Qin Yuanqing cannot understand what he is doing. Yes, they were confused when they saw Qin Yuanqing constantly drawing ghost symbols on the draft paper.