The final result was that the jewelry was still lying in the display case, and Shang Yiyun did not buy it.

When he left the jewelry store, he seemed to hear someone mention him.

"My dear, look at the person just now, he can't afford to buy anything in this kind of place at all, it's like me, I'll buy it for you whatever you like. ”

Shang Yiyun didn't pay attention to this situation, he felt that he couldn't be as knowledgeable as this kind of nouveau riche.

Shopping shop by store, even if Shang Yiyun's physical strength is better, he also feels tired, because the most important thing is tiredness.

As a boy, Shang Yiyun is naturally indifferent to things like shopping, and buying things is simple and rude, and he can't bargain at all.

When you encounter something you like, you will buy it directly, this is the difference between a boy and a girl when shopping, at least he is so.

Of course, now is to accompany Chen Feiyun to go shopping, as long as the other party is happy.

Time passed slowly, and Shang Yiyun also had an extra bag in his hand, which was something that Chen Feiyun bought for him.

After strolling around this commercial street for a while, Shang Yiyun and Chen Feiyun were ready to go back to school, and it was already close to noon, so before that, the two had lunch nearby.

There is still something to do tomorrow, so he has to go back and prepare, and tomorrow's youth science and technology seminar can meet many young science and technology people.

Knowing some outstanding young people of the same age will also be beneficial to his future development.

At this time, the two had already returned to the vicinity of the school, and Shang Yiyun first sent Chen Feiyun back to the women's dormitory of Huaguo Normal University, and then prepared to return to Kyoto University.

When he was walking on the road, he called Cao Xun and Zhang Liu respectively and canceled tomorrow's experimental plan, and as for the reason for the cancellation of the plan, he naturally explained it to the two.

Shang Yiyun didn't know that when Cao Xun and Zhang Liu heard that he was going to participate in the Youth Science and Technology Seminar, they were very envious.

Because the young people who can participate in this kind of seminar are all relatively outstanding people, being able to participate in this kind of seminar can be regarded as a proof and a kind of recognition.

However, envy is envy, Cao Xun and Zhang Liu are not jealous in their hearts, because they know that with Shang Yiyun's ability and achievements, they deserve to obtain this kind of thing.

After explaining clearly to the two, Shang Yiyun hung up the phone.

He is coming back now to prepare a speech, and although it is not clear whether he will be given the opportunity to speak, it is not a bad thing to be able to prepare in advance.

Thinking of this, Shang Yiyun quickened his pace, and after a while, he returned to Kyoto University.

After returning to school, he did not go anywhere else, but went directly to the dormitory, since he had to prepare for tomorrow's youth science and technology seminar, he naturally used the computer.

When he returned to the dormitory, he found that the dormitory door was closed and his roommates were not in the dormitory.

Without forgetting the main purpose of returning to the dormitory, he took out his laptop and began to write a speech.

What Shangyi Cloud is going to talk about is related to recent research, that is, new energy, and the knowledge of this area has reached the point of mastery.

Although I don't know if he will be asked to speak tomorrow, he will still prepare in advance to avoid not being able to get something when he is asked to speak.

Thinking of this, Shang Yiyun was immersed in the state of writing, and it was difficult for things in the outside world to interfere with him.

However, before writing, it is necessary to recall the content related to new energy.

The first thing that came to his mind was solar energy, after all, solar energy is so famous that almost everyone knows about it.

There are three main forms of solar energy: photothermal conversion, photoelectric conversion and photochemical conversion.

In a broad sense, solar energy is the source of many energy sources on the earth, such as wind energy, chemical energy, water potential energy, and other forms of energy that are caused or converted by solar energy.

The main methods of using solar energy are: solar cells, which convert the energy contained in sunlight into electrical energy through photoelectric conversion, and solar water heaters, which use the heat of sunlight to heat water, and use hot water to generate electricity.

Solar energy is clean and environmentally friendly, without any pollution, with high utilization value, and solar energy has no energy shortage, and many advantages determine its irreplaceable position in energy replacement.

However, the status of solar energy in the field of new energy is extraordinary, but Shangyi Cloud has no idea of stepping into this field.

There are pros and cons to everything, and solar energy is no exception.

There are mainly four advantages and four disadvantages, thinking of this, Shang Yiyun first wrote the four advantages of solar energy into the speech.

The first advantage is universality: the sun shines on the earth, there are no geographical restrictions, whether it is land or sea, whether it is high mountains or islands, it can be directly exploited and used, it is easy to collect, and there is no need for mining and transportation.

The second is harmless: the development and utilization of solar energy will not pollute the environment, it is one of the most clean energy, and this is extremely valuable in today's increasingly serious environmental pollution.

The third is enormous: the amount of solar radiation reaching the Earth's surface every year is equivalent to about 130 trillion tons of coal, which is the largest energy source that can be exploited in the world today.

The fourth is longevity: according to the rate of nuclear energy produced by the sun, it is estimated that the storage of hydrogen is enough to last tens of billions of years, and the lifespan of the earth is about billions of years, in this sense, it can be said that the energy of the sun is inexhaustible.

As for the disadvantages, there are mainly the following four aspects.

The first drawback is that it is too scattered: although the total amount of solar radiation reaching the surface of the Earth star is very large, but the energy flow density is very low, on average, near the Tropic of Cancer, in the summer when the weather is relatively clear, the irradiance of solar radiation at noon is the largest, and the average solar energy received on the area of 1 square meter perpendicular to the direction of sunlight is about 1000W; if it is averaged by day and night throughout the year, it is only about 200W, and in winter, it is roughly only half, and the cloudy day is generally only about 15, therefore, when using solar energy, if you want to get a certain conversion power, you often need a set of collection and conversion equipment with a considerable area, so the cost is also relatively high。

The second is instability: due to the limitation of natural conditions such as day and night, season, geographical latitude and altitude, as well as the influence of random factors such as sunshine, cloud, cloud, rain, etc., the solar irradiance reaching a certain ground is both intermittent and extremely unstable, which increases the difficulty of large-scale application of solar energy; Stable energy, so that it can eventually become an alternative energy source that can compete with conventional energy, must solve the problem of energy storage, that is, to store solar radiation energy in clear daytime as much as possible for use at night or rainy days, but energy storage is also one of the weaker links in solar energy utilization.

The third is low efficiency and high cost: the development level of solar energy utilization, some aspects are theoretically feasible, and the technology is also mature, but some solar energy utilization devices, because of low efficiency and high cost, so in the future for a considerable period of time, the further development of solar energy utilization is mainly restricted by economics.

The fourth is solar panel pollution: at this stage, solar panels have a certain lifespan, generally up to 3-5 years, you need to replace solar panels once, and the replaced solar panels are difficult to be decomposed by nature, thus causing considerable pollution.

With all kinds of considerations, Shangyiyun has not set foot in the application field of solar energy, but new energy is not just solar energy.

Wind energy, biomass energy, tidal energy, geothermal energy, hydrogen energy and nuclear energy all belong to new energy, among which biomass energy, hydrogen energy and nuclear energy, he has a relatively deep understanding before, and now it is not difficult to integrate these knowledge into it.

But he had to organize the content first, and only then it would be much easier to write it on the computer.

Among them, marine energy refers to various renewable energy sources contained in seawater, including tidal energy, wave energy, current energy, seawater temperature difference energy, seawater salinity difference energy, etc.

These energy sources have the advantages of renewability and non-polluting the environment, and are a new energy source of strategic significance that needs to be developed and utilized urgently.

The amount of energy in the total water body of the ocean is huge, and the energy per unit volume, unit area, and unit length is small, that is, in order to get a large amount of energy, it must be obtained from a large amount of seawater.

Ocean energy comes from the gravitational attraction between solar radiation energy and celestial bodies, as long as the sun, moon and other celestial bodies coexist with the earth, this energy will be regenerated, it will be inexhaustible, so it is said to be a renewable energy source.

......

After sitting on the chair for a long time, Shang Yiyun also felt uncomfortable, so he stood up and moved, looked at the time, and found that two hours had passed.

Now that what has been written is 90% complete, give him some more time and he will be able to finish it all.

However, there was still a long time until tomorrow, and he was not in a hurry for this moment, so he walked out of the dormitory door, stood by the aisle, and looked into the distance.

Because there is no shelter in front of him, and his dormitory is on the fifth floor, the scene in the distance is suddenly unobstructed, and the school library can be seen from here.

Although he has been there a lot less often, he still remembers the scene of going to the library to study in the first semester of his freshman year, when he had just entered the university and was like a sponge, in urgent need of water.

Now he doesn't need to do this, but the good habit of reading books has been retained.

After looking at the distance for a while, looking at the greenery, looking at the scenery, I felt a little fatigue on my body, and then I returned to the dormitory.

There is still 10% of the content left, and since he has rested, he has to finish the rest.

It's just two o'clock in the afternoon, and there seems to be nowhere to go after I'm done, so I'd better finish the rest of the work before thinking about anything else.

Time passed slowly, and it only took more than ten minutes for Shang Yiyun to finish the rest of the content, and his three roommates had not yet returned to the dormitory.

As for what he was going to do next, he thought about it for a while when he was writing just now, and thought it would be better to go to the teacher's office.

There are a lot of things to do during this time, and he hasn't been to Chen Dezhi's office for a long time, and even if there is anything, he is still contacted by phone.

Just like the previous youth science and technology seminar, the other party let him know about it by making a phone call.

With this plan, Shang Yiyun was ready to leave and go to the teacher's office, although it was the weekend, he had heard the teacher say before that he had some things to do in the near future, so he would stay in the office.

Thinking of this, he locked the door of the dormitory and headed for his destination.

It took him a few minutes to come to the teacher's office, knock on the door, and after walking in, Shang Yiyun saw his teacher.

The other party was hunched on the table writing something, apparently for the sake of experimentation.

Faced with this situation, Shang Yiyun walked in front of his teacher and watched quietly from the side.

After watching it for a while, he didn't make a sound, and at this time, Shang Yiyun's teacher found out that he had come here.

"Yi Yun, I didn't expect you to come to my office, and you didn't tell me before. ”

At this time, Shang Yiyun heard Chen Dezhi's words, smiled, and said.

"I didn't come to your office because I had a lot of things to do before, but now that things are basically done, I came to your office and wanted to come over to talk to you. ”

At this time, Chen Dezhi was also happier after listening to Shang Yiyun's words.

In the following time, Chen Dezhi took out his tea set and began to make tea, ready to chat while drinking tea.

Faced with this situation, Shang Yiyun sat on the sofa and began to wait.

After waiting for more than ten minutes, Chen Dezhi made tea, so the two began to drink tea and chat.

After chatting for a while, he shifted the topic to tomorrow's youth science and technology seminar, for this kind of thing, Chen Dezhi also attaches more importance to this kind of thing, he and several professors before, let Shang Yiyun participate in this youth science and technology seminar, just so that Shang Yiyun can shine at this conference.

Shang Yiyun is also very clear about the expectations of his teacher Chen Dezhi, so he has prepared tomorrow's speech before, if he can speak, it will naturally be in line with his mind, if he can't speak, it can only be regarded as providence.

Time passed slowly while the two were chatting, and after staying in Chen Dezhi's office for more than two hours, Shang Yiyun left here.

It was already 5:30 p.m., and he was going to go to the cafeteria for dinner before heading back to his dorm.

Although the time to eat is a little earlier than usual, he is going to rest early today, so it doesn't matter if it's time to eat dinner earlier.

When I returned to the dormitory just now, I found that my roommate had returned to the dormitory, Shen Fengyu was doing a live broadcast, and as for Yue Xiaolei and Tian Xiaoyue, they were also busy with their own things.

For this situation, Shang Yiyun didn't say anything, but returned to his position, turned on the computer, and began to watch some real-time news, watching the news is also one of his interests, because he can get useful things for himself from these news.