Chapter 40

Along the way, Xiang Qianjin suffered. If Lin Kexin and Liu Ruoxin knew, what would they be like? Fortunately, the distance is not far. Xiang Qianjin took Zhou Yuhan to the University of technology and entered the courtyard of the University. Xiang Qianjin found that there were not many people here, which should be the reason for the class. Although there is only one word difference between the University of technology and the University of science and technology, their full names are totally different. Xiang Qianjin is from the University of science and technology, while Zhou Yuhan is from the University of science and technology. Although there is one more industry, the professional direction has a strong directivity.

Xiang Qianjin followed Zhou Yuhan. He came to the library carefully. There were not many predecessors in the library. After Xiang Qianjin and Zhou Yuhan entered the library, Zhou Yuhan found a seat and occupied it. She said with a smile: "you go to get the book first, I'll help you to occupy the seat."

Xiang Qianjin nodded. He went to the bookshelf and saw a lot of books. He selected some books with high experience value from them. These books are all marked. It's really the library of the University of science and technology. There are really many professional books in it, and the update speed is faster than that outside. The latest magazines and some foreign scientific papers are clear at a glance!

Xiang Qianjin took a lot of papers and materials and put them on the table. Zhou Yuhan was surprised and asked, "what are you doing? Brush the books? "

Xiang Qianjin replied helplessly: "yes, otherwise, what can we do? Now we have to spread the net and catch more fish. There is no way!"

Zhou Yuhan smiles and gives a thumbs up. Then she goes out and takes three books back. Compared with Xiang Qianjin's stack of foreign language materials, her three books are much thinner. Xiang Qianjin's view of these things is basically scanning, because after seeing them, they will be synchronized with the system. There are these things in the system's database, but they need to be synchronized, That is to say, the ultimate reward for mastering the current level of human science and technology is the progress of science and technology. As long as there are enough steps, more science and technology points can be obtained.

With a brush of books, Xiang Jin begins to enter a state of selflessness. The accumulation of this experience is very enjoyable for Xiang Jin. Sitting beside a beautiful woman, Xiang Qianjin is as steadfast as an old monk, seriously boating in the ocean of scientific knowledge. How many people admire him?

Zhou Yuhan is the school flower! She is famous in the whole school, but Xiang Qianjin is too enviable by comparison. Xiang Qianjin is not ugly. The reason Meng Yang feels the sense of crisis is that Xiang Qianjin's young man is still good-looking, but he doesn't mean to look at the school flowers around him? Isn't that arrogant? Or does he deserve to be single?

Zhou Yuhan found that Xiang Qian was very serious when he was reading, which made her enter the state. After scanning the data, move forward to collect the data, and then scan. When Xiang Qianjin came back with a large pile of information, he found two girls sitting opposite him. The two girls looked at Xiang Qianjin with a smile, and then extended a small white hand to say hello to Xiang Qianjin. Xiang Qianjin didn't know them, but he nodded politely when he saw others waving. Then they put the information on the table. Seeing the thick information, the girls looked at Xiang Qian in surprise and said, "what are you doing? Brush the books? "

Xiang Qianjin smiles and nods. Zhou Yuhan couldn't help laughing. She said in a low voice, "this is an expert. What do you know?"

"Cousin, where did you know him? How powerful? Why don't you do me a favor

Xiang Qianjin looks at the opposite girl suspiciously. He looks like she is less than 20 years old. Xiang Qian asked curiously, "what's the matter?"

"Well, I'm from electronic communication. We have a course on 3G outlook recently. It's about 3G outlook in the future. Do you have any suggestions?"

"It's difficult for GSM to survive under 3G, because their communication architecture mode is not suitable for it. So if you want to talk about the prospect and development, I suggest you start from CDMA. CDMA is a multi-channel mode, called code division multiple access. It means that multiple signals occupy only one channel, which greatly improves the bandwidth utilization. This is much better than GSM. GSM is time division multiple access, which turns time into frame by frame, like animation. Then each frame is divided into many time slots. To each base station. In the final analysis, I would like to make a metaphor. The operation mode of GSM is somewhat similar to that of a train. At the same time, it can only take one train. But at the same time, this time period is divided into several channels, so that there are different channels in this time period. But there's only one train. " Xiang Qianjin then drew several horizontal lines on his notebook, and then drew a small train on it. He made a figurative comparison, and the little girl nodded happily and said, "what a good image you are talking about!"

Xiang Qianjin then drew a horizontal line, and then drew a train on it, saying: "CDMA is not the same. It's our illusory imagination. Trains are the existence of different parallel worlds. Although they overlap, they do not interfere with each other. This is the concept of code division multiple access. In the same channel, multiple different codes can be used to transmit messages without interference. This is very suitable for the development of 3G technology in the future, because from our point of view, if 2G is short message, the 3G revolution is mostly the era of Internet connecting mobile terminals. We can provide mobile terminals for Internet access. " At this point, Xiang Qianjin tore a piece of paper from the back, then folded it in half and drew a small train on each of the two layers of paper. Stacked together!Xiang Qianjin smiles and hands it to the little girl.

The little girl patted her white hand and said with a smile, "that's amazing! All of a sudden, I got to the point! Master, are you a professor? "

"Me? I'm just a very ordinary student. "I'm from the University of science and technology," Xiang Qianjin said with a gentle smile. Just as he was talking and laughing, suddenly an old man came over with his hands on his back and said, "what are you talking about? So happy? Why don't you keep it down in the library? By the way, Yuhan! Do you have an idea for your project? "

Xiang Qianjin was stunned for a moment, and an old man came over. He was wearing a light blue short sleeve shirt. After looking at Xiang Qianjin for a while, the old man didn't recognize it. Zhou Yuhan said with a smile, "Professor Cheng, I'm still looking for the topic, but I've got a direction. I'd like to study lithium batteries, And a new direction is lithium-ion batteries. "

This old professor, Xiang Qianjin, is one of the pillars of the Chinese science and technology circle. His main research direction is hydrogen power battery. His research and development is very good!

The old professor looked at Zhou Yuhan with a smile. He seemed to be a little interested in the battery. With a kind smile on his face, the old man said, "lithium ion battery? It's really good, but there are not many people related to technology tracking in China. Your topic is not very good, and the materials are not very easy to find, and the domestic R & D process has not reached this level. I personally recommend that you make more efforts on the future development of hydrogen batteries. "

Xiang Qianjin knows the opportunity is coming! This is a chance to talk! Seize the opportunity is equal to seize the road to success! The best way to talk is to start from each other's interests! Xiang Qianjin said with a smile: "hydrogen battery? This is a solution for large-scale equipment, but the hydrogen production scheme can only stay in the direction of electrolyzing water, and the exchange ratio of electricity for hydrogen is still not very good. Moreover, the temporary technical conditions for its development are far less likely than the mass production of lithium-ion batteries. If the level of manufacturing industry has been greatly improved, hydrogen batteries may still be able to be improved, so I personally recommend lithium-ion batteries. After all, the most direct thing that can change our lives in a short time is the electronic technology developed by mobile phones. The information revolution has predicted this for a long time. In terms of direction, I recommend the development of small and medium-sized batteries for personal use. This is very important. "