Although Junxin doesn't have to worry about the next things, when more and more people began to gather in this classroom, Junxin's heart still felt a little nervous inexplicably. After all, it was not a group of students who came to this place to listen to the report, but scientists who stood at the pinnacle of this era and field. If a terrorist were to carry out an attack at this time, human civilization would have stood still for twenty years.

Jennifer came and went quickly, because she was a student of our school, and the materials needed for the report were copied, so it only took ten minutes to solve the problem. Then the materials were distributed to the scientists who came in turn, and the dilemma of insufficient report materials was finally solved.

Time passed little by little, and when it was almost two o'clock, Junxin walked onto the podium step by step, waiting for the final time to come under the surprised gaze of almost everyone.

"Hello everyone, my name is Junxin, I am the speaker of this lecture hall, from the Department of Mathematics of Mizuki University, and I am also the discoverer of quasicrystals."

As soon as Junxin's flower finished speaking, the audience suddenly exploded with a "boom", and a "buzzing" intensive discussion sounded. Knowing what they were discussing without having to listen, Junxin simply made a pause of nearly a minute to let them digest the information contained in what they had just said.

"Okay, let's officially start our report... Oh my God, Ms. Hodgkin, why are you here? Junxin was about to start, and the corner of his eye habitually glanced out of the door, but he was surprised to find Hodgkin walking in slowly.

"I just wanted to see what the discoverer of the quasicrystals looked like, oh God, you're so young!" Taken together, Junxin's age and his achievements are enough to shock any scientist.

"Thank you for the compliment!" Jun Xin said in disgrace, but then said a little helplessly, "You know, being young sometimes means that you are not authoritative enough, and your achievements will be questioned. ”

"Haha, we always use experimental data to speak, it's nothing!" After a pause, he said, "Okay, I won't delay your report." At this time, Jennifer quickly stood up and gave up her place to Hodgkin.

"All right, ladies and gentlemen, let's move on. The discovery of quasicrystals can be said to be both a beautiful misunderstanding of nature and a beautiful misunderstanding in academics. ”

Why? That's because of a wonderful misunderstanding. In October of last year, I was about to go to class after solving a problem all night, but due to extreme fatigue, I went to the wrong classroom and came to the classroom of the crystallography course, which is one of the branches of basic chemistry. Although I knew that I had gone to the wrong classroom, it was also a good choice to listen to the crystallography course, so I stayed and prepared to attend the class. However, because of the all-nighter, I couldn't keep up with my energy for a while, so I fell asleep unfortunately, so my teacher, Professor Chen, asked me to get up and answer the questions in line with the principle of being strict and serious. The question he asks is what is the definition of crystal. ”

Junxin said this, with a look of reminiscence, and the audience was silent for a while, although this is not an academic key thing, but people will always have a great interest in history, so it sounds extraordinarily serious: "At that time, my answer was that crystals are a long-range orderly structure of the substance. However, it was clear that this was an incomplete or unserious answer compared to the definition of crystallography at the time, so Professor Chen corrected my answer and added the concept of periodicity at the end. ”

"But at the end of the day, I'm a mathematician, so my understanding of periodicity is different from that of chemistry, and one of the mathematical problems I was working on at that time was called the Penrose puzzle problem, which was one of the more famous problems in mathematics. Probably speaking, you can fill the entire plane with two different patterns. One of them is a thin diamond at 36° and a fat diamond at 72°. ”

"At that time, I was only in the first place to encounter this problem, so I thought that what my teacher, Professor Chen, said was not right, and crystals do not necessarily need periodicity, and the Penrose puzzle is a good example. Again, I would like to emphasize that I was just a mathematician, not a chemist. ”

"But Professor Chen's liberal and tolerant academic attitude helped me a lot, and he thought that my point of view was unique and interesting, so he invited me into his lab to verify the problem. So it took a week to generalize the Penrose puzzle to three-dimensional space, discovered the rules of the icosahedron puzzle, and then began experimental research. ”

"Actually, I don't know much about chemistry, but I tried to prepare what I wanted with a very fast setting method with a very fast change of temperature, and finally found an optical pattern of ten symmetry in an aluminum-manganese alloy. That is, the first quasicrystal. ”

Speaking of this, there was a round of applause from the audience. Sometimes that's how it is, a wonderful idea, a forgiving mentor, and a tireless effort, the result of a wonderful combination of three discoveries is the biggest earthquake in crystallography in recent years.

"Thank you!" Junxin bowed politely and continued: "Since the discovery of quasicrystals, I have returned to my post to use mathematical methods to conduct research, and of course this is also the model method, which is one of the three research methods of quasicrystals. The others are molecular dynamics methods and experimental methods. After a lot of calculations, I finally built several models that were more consistent with experimental observations. The first of these is the overlay model...... The second is ......"

"Recently, I started taking physics courses, so I started to build quasi-crystal models of molecular dynamics with the mathematical model built, and I discovered the molecular dynamics model of the pentagonal, octagonal, dodecagonal, octagenal, and icosahedron. And the verlet method and the improved method are used to temporarily get a satisfactory solution. ”

"Of course, in the method of experimental observation is also to increase the effort, I and two professors in my laboratory discussed the experimental improvement plan, through a variety of methods, to study the formation rules and distribution laws of quasicrystals, on the basis of a large number of experiments, temporarily came up with a more in line with the experimental observation of the empirical law, temporarily called it "Xu-Zhang rule", this is a result of the two professors in my laboratory Xu Jiang and Zhang Yang designed many schemes to verify. However, I believe that there should be other rules, and the principle of formation is not clear, and this needs to be verified and discovered by your efforts. ”

"In addition, we have summed up some experience after many experiments, it is estimated that it will not be long before a big article on the research of quasicrystalline preparation methods will be published, and my two partners have summarized several experimental methods and attached the detailed structural data of the corresponding preparation of quasicrystals, which you can read at that time."

Speaking of this, Junxin paused and took a sip of water and continued: "Back to my own job, I am a mathematician, so I like to use mathematical methods to explain problems. So recently I've been working on quasicrystallography at the same time as the traditional crystallography, which is to explain the lattice and structure of crystals from the perspective of group theory, which is a big project, and I have preliminarily completed a crystallography table, which I can publish for everyone if necessary. ”

"The last thing I want to say is, what are the properties of the quasicrystals that we have found so little? What is the classification? How is it being applied? Even some physical and chemical properties, including optical properties, need to be studied together, from multiple perspectives such as model construction, molecular dynamics simulation and experimental observation, which is the development trend of quasicrystals in my eyes. Thank you! ”