Chapter 171 Don’t ask me if I’m right or wrong, I’m only responsible for my model After receiving the report from the School of Materials and Chemistry of Jiangzhou University, Xia Guo Academy of Sciences immediately conducted research and analysis, with Xia Guangming personally participating. This is the school where Lu Shan is studying, and Xia Guangming takes it very seriously. If it succeeds, it will prove Lu Shan's value from the side! There are mathematicians, but there are too few excellent mathematicians, and even fewer excellent mathematicians who can safeguard practical scientific research! If Lu Shan is such a person, then Lu Shan can help build mathematical models in more fields and improve the efficiency of scientific research. Xia Guangming judged that Lu Shan had strong ability in applying mathematics based on his achievements in communications and the Internet, so he made a move to recruit him. However, there always seemed to be something wrong with this report from the School of Materials Science and Engineering of Jiangzhou University. Xia Guangming made this judgment based on his academic intuition and basic knowledge. But looking at the data again, the results do match. The assumption is correct, the data is correct, and the method is correct, but there is an indescribable sense of awkwardness. To be on the safe side, Xia Guangming also checked the attached experimental site records, and after confirming that the data was not falsified, he contacted Shen Yanchun, dean of Jiangzhou College of Materials and Chemistry. After briefly explaining his purpose, Shen Yanchun knew where the problem lay. In fact, he really couldn't see what was wrong with his own level, but when Xia Guangming said something was wrong, he couldn't directly refute it. He is an academician, so his hard power must be much stronger than mine, and he also pointed out some specific problems.
Shen Yanchun suggested a detailed review, which meant that in addition to repeating the experiment, an academic discussion should be conducted, just like a thesis defense. His supervisor was Xia Guangming. Xia Guangming quickly connected to the School of Materials and Chemistry of Jiangzhou University for online inquiries. Tan Ming will be the main speaker and the main defense officer. He was not at all flustered by Xia Guangming's questions and kept giving reasons. The more Xia Guangming listened, the more strange it seemed. The mathematical model was accurate, but the experimental process did not seem to be very compatible with the mathematical model. The most important thing was that some reactions did not conform to the normal reaction model. Tan Ming is very determined about his scientific research results: "An accurate mathematical model will save a lot of trouble, but experiments are about specific operations. It is normal to have discrepancies with the model. No one can completely build the experimental results in theory. We can only do experiments and revise our ideas at the same time. We have been studying this experiment for a long time, and have made some progress bit by bit..." Xia Guangming frowned. He didn't want to listen to this nonsense, so he interrupted: "The deviation between your mathematical model definition and the experiment exceeds the appropriate range. Although it is not much, if there is no reasonable explanation, it should be regarded as a failure." "Our results are correct, the process is fine, and the model can only be used as a reference..." Tan Ming was a little unconvinced, but he did not dare to question Xia Guangming too much. At this time, Shen Yanchun spoke up: "Tan Ming is an excellent researcher. He has made great contributions to our school's material chemistry achievements in recent years..." Shen Yanchun spoke for several minutes, all about how excellent Tan Ming was, and all he praised was the entire talented team. The levels of these honors are not actually particularly high, but the number is still good. With Shen Yanchun's endorsement, Xia Guangming also believes that Tan Ming's thesis should be reasonable. Everyone saw the expression on Xia Guangming's face. Shen Yanchun then continued, "The mathematical models were provided by Lu Shan, and the calculations were verified by the model before we started the experiment, so there shouldn't be any problems." Shen Yanchun is a smart man, so he moved out of Lushan. As expected, Xia Guangming's expression immediately eased a lot. Such an obvious change made the team of the School of Materials Science and Engineering very unhappy. Did the materials science major have to look at Lu Shan's face to do experiments? Why did he, a cross-disciplinary mathematics student, have such an important position? This was not a mathematics project! Tan Ming was even more unconvinced. All the achievements he had made over the years, all the titles he had, were not as good as Lu Shan's. He moved his mouth again and again, wanting to say something, but Shen Yanchun kept winking at him with his back to the camera. What does personal emotion matter? Keeping the project in the academy is the most important thing. "Is it really Lu Shan's mathematical model?" Xia Guangming confirmed again. "It's genuine! It seems that no one at Jiangzhou University can provide such an accurate and reasonable model." Shen Yanchun made the guarantee, and it was true. Xia Guangming looked at the mathematical model again and found it to be very accurate and reasonable, as well as concise. It was indeed the work of Lu Shan.
After this inquiry, Xia Guangming felt more at ease and asked his subordinates to put the results into the project's major experiment. But Xia Guangming was cautious. He did not see Lu Shan at the scene when he asked this question, so he wanted to ask Lu Shan about his opinion on the experimental results. More importantly, Lu Shan did not sign the paper. "Student Lu Shan, I want to ask something..." Lu Shan received a call from Xia Guangming and said bluntly: "I provided a mathematical model according to their ideas, and I am only responsible for the mathematical model I provided, not for their experimental results. "What do you mean?" Xia Guangming was very surprised. "I think there is something wrong with their experimental process. Often, they come to me for a mathematical model when they can't figure out the direction of the experiment at a certain stage. Based on my conception of the entire experiment, they are wrong." “But the result is right.” "That's because the mathematical model supports it. Putting the data from each stage together looks correct, but in fact it cannot be repeated for a long time and many times." "Can you be more specific?" "The main reason is that the mathematical model is distorted." "First, for Weyl semimetals (conduction band and valence band contact at nodes): by analyzing the differential structure of topological defects, it is found that the Weyl nodes are monopoles in momentum space, which are three-dimensional topological defects. At these singularities, the Chern number is not well defined, and a topological phase transition occurs. There are also two-dimensional topological defects in Weyl semimetals, namely merons, whose topological charge gives the Chern number of the semimetal. The second pair of nodal line semimetals (conduction band and valence band contact at nodal lines): By analyzing the differential structure of topological defects, it is found that there are four-dimensional point defects in the system. At these singular points, the Hopf invariant is not well defined and a topological phase transition occurs. I talked to them about these two problems from the beginning, and also improved the definition of statements and invariants. Following this idea, we can improve the topological phase transition very well. " Lu Shan added: "This is only part of the mistake. There are other things that need to be explained bit by bit." Xia Guangming suddenly realized that it was no wonder that he felt something was wrong. This turned out to be the case. "According to the theoretical model, the topological superconductor made by the School of Materials Science and Engineering team will have serious vortex defects, and the surface defects in the topological insulators they made are also very serious. Even though it seems that some of the performance has been achieved, other key indicators cannot be achieved." “I dare to conclude that if we conduct experiments according to the results of Jiangzhou Institute of Materials Science and Engineering, problems will occur in the three complete processes. Even if there are no problems, it will consume a lot of resources and equipment, and the cost of the products will be high and the success rate will be low. So I suggest that you first conduct a partial verification of the paper from the School of Materials Science and Engineering. According to estimates, it only takes five small experiments to find that the results are very biased. Don't easily put it into the research cycle, otherwise it may even affect the data in other links! " "What?" Xia Guangming almost jumped up. Lu Shan was so sure because he had found too many deviations from the perspective of the mathematical model. However, considering that Lu Shan was a cross-disciplinary student after all, he was still cautious. He decided to discuss the issue from the perspective of mathematical models on the one hand, and on the other hand, follow Lu Shan's advice to split the paper from the School of Materials Science and Engineering and conduct multiple arguments on the local details. "Can you come over here? We can discuss the mathematical model..." "I'll send you some of the mathematical models I've come up with. I really can't leave here." Lu Shan decisively refused and developed topological semimetal semiconductor materials by himself. He no longer needed anyone's help. Besides, I am still perfecting my paper. I will write what I can and replace what I can’t with experimental results. Who is crazy enough to write everything? What if and grab it? When Xia Guangming heard Lu Shan’s refusal, he did not insist and concentrated on studying Lu Shan’s mathematical model of the entire experiment. In the Yingling Space, Poincare and Turing jointly guided Lu Shan's thesis. The two of them cooperated very well. Poincare had a foundation in mathematics and had a deep understanding of the concept of computer models. Turing himself is a mathematician, but he did not delve too deeply into this area. During this period, he asked Poincare to give him lessons, and the two of them had already gained a good understanding of each other's fields. Under the guidance of these two great people, Lu Shan wrote his thesis very smoothly. Sometimes Poincare even wanted to write it himself, but how could Lu Shan miss such a good learning opportunity, so he naturally would not let him succeed. Turing was much calmer. He talked to the point without any nonsense and was very frugal with his words.
Since Turing unlocked the code, Lu Shan has never heard Turing tell a joke. Perhaps his life was too miserable and he no longer had any passion for this world. Fortunately, Lu Shan never gave up on counseling Turing. That day, he packed a portion of Mapo Tofu for Turing, and Turing rarely said he would bring it next time. Lu Shan laughed in silence. Eagle Country was a well-known food desert. There was nothing else except French fries, fried chicken nuggets and small soybeans for sauce. It was easy to think of delicious food. Xia Country had plenty of it! The paper is about the properties of topological semimetal semiconductors. It records in detail the mathematical model, experimental ideas, and experimental process. It describes the defects of topological semimetal semiconductors and explains the ideas for avoiding defects. I will not go into details about the rest and will directly look at the evidence for the efficacy. At this time, Xia Guangming became more and more uneasy. He compared Lu Shan's mathematical model with the things from Jiangzhou Institute of Materials and Chemistry and found many problems in the details. After much consideration, he decided to go to Jiangzhou to meet Lu Shan in person. Thank you all for your monthly tickets! Of course, the more the better! (End of this chapter)