And the dandelion project derivatives are not the only ones.

As the general leader of this project, Su Changli, who is also the chief engineer, is responsible for the part of the guide rail and electromagnetic acceleration system.

It's not a simple system.

Otherwise, the US Ford's would not have been in service all the time, because their electromagnetic catapult technology was not up to standard.

Su Changli has no moral cleanliness, he directly "borrowed" the mature technology of a certain big country.

However, he did not follow the script, because the quality of the ejection of the two sides is different, the ejection mass of the dandelion project starts at least 500 tons, and the speed has to reach 7.8 kilometers per second, and there is definitely no way to copy it directly.

His design scheme was adjusted to nuclear fusion earthplace + resonance power generation + temperature difference power generation as the power supply system.

One of the characteristics of resonant power generation is that instantaneous power generation can be exploded by nuclear explosion, which reduces the pressure on supercapacitors.

But in this process, Su Changli found a problem that he had ignored before, that is, the instantaneous high voltage and high current, which could easily cause the transmission system to be overloaded and even easily paralyzed.

This problem is very serious, if the spacecraft happens to be accelerating, and suddenly one of the power supply links fails, it may cause the spacecraft to not be able to increase its speed, and then it cannot fly out of the atmosphere.

To do this, he contacted major power companies and electric power research institutes.

Finally, after several months of hard work, Heli came up with a superconductor material, an alloy material that uses a combination of copper, barium, lanthanum and silver, which can maintain superconducting properties at temperatures below minus 24 degrees Celsius.

Although it does not reach the level of a room-temperature superconductor, minus 24 degrees Celsius is not impossible.

The liquid nitrogen circulating cooling system can maintain the temperature of the transmission line at minus 30 degrees Celsius, and the core of the liquid nitrogen circulating cooling system is equipped with an inverse temperature difference system to efficiently extract the heat of liquid nitrogen and achieve low-cost and high-efficiency refrigeration.

The properties of superconductors need not be explained.

In superconductors, there is almost no loss of current.

It is important to know that in conventional wires or plateau cables, the current has an invalid loss of 10~20%, and this part of the energy is wasted.

Although Homo sapiens has been promoting a power supply balance strategy, striving to supply power to various cities and bases in the vicinity, rather than engaging in long-distance transmission across regions.

But even so, the loss of current during the transmission process is still not small.

Therefore, this alloy material has a lot of potential.

It's just that the cost of this material is relatively high, which makes many power companies feel a little painful.

Copper and barium are fine, as Homo sapiens has discovered several very large deep copper deposits in Luzon and Sumatra, bringing the total copper reserves to 1.28 billion tons, and barium can be refined from seawater, which is no problem.

But lanthanum and silver are not the same.

Lanthanum belongs to the rare metal, and silver is a precious metal.

According to the optimal ratio, it is 41.3% copper, 31.2% silver, 15.8% barium, and 11.7% lanthanum.

The use of silver and lanthanum is so great that even if the underground veins discovered by Homo sapiens are calculated, the silver reserves are only 8.37 million tons, and the lanthanum is only about 72,000 tons.

Among them, lanthanum has other uses, and the current annual output is only 600~700 tons, which determines that this type of superconductor cable is difficult to be applied on a large scale.

However, some scientific research laboratories, such as the Starter Laboratory and the Tokamak Laboratory under the nuclear fusion research, need such superconductors.

In addition, the transmission line of some first-class cities can also use this material.

After all, the monetary attributes of silver are not high, and expanding its industrial attributes is the king.

In any case, the silver and lanthanum used to make superconductor cables do not disappear after use, but they can also be recycled and reused when the technology is innovated in the future.

Through the research and development of lead-tungsten-gold thermoelectric materials and copper-barium-lanthanum-silver superconducting materials, Homo sapiens has also discovered various rare metals and precious metals, which are increasingly important in industry.

The acquisition of precious and rare metals, as well as the bundling of gold dollars, have effectively increased the resource reserves of Homo sapiens.

But that's not enough.

Now, in addition to continuing to dig deep into the potential of local resources, Homo sapiens also looks to the vast Pacific Ocean, Ceylon Ocean, and Southern Ocean, as well as South America, Africa, and Antarctica.

The resources in these areas are not highly developed, and some are even inaccessible, and the resources contained in them tempted Homo sapiens to speed up their pace.

The endowment of natural resources plays a very crucial role in the development of a power.

For example, America, relying on the vast Great Plains of North America, has a very strong agricultural production potential, and even if it is forced by Homo sapiens to shrink its sphere of influence, it can still maintain its internal potential.

In the case of the European Union, if they are besieged by Homo sapiens with all their might, then they will definitely not be able to hold out for a few years.

The EU's agricultural, energy, and mineral endowments are average, and it is difficult to stabilize internally if it loses the supply of resources from those economic colonies and Lucia.

Even if the EU is not the first opponent of Homo sapiens in recent years, just because it has been affected by the confrontation between Homo sapiens and América, all kinds of problems have arisen.

Homo sapiens frantically grabs territory and population in order to weaken the opponent's available resource potential and compress the opponent's living space.

In the future, if you want to enter the starry sky, the resources required must be sky-high.

If you don't have enough resources, you can't play the universe at all.

……

The cooperation between Su Changli and the power company has brought about the application of low-temperature superconductors.

In addition, the metro group also approached Su Changli, wanting to introduce electromagnetic acceleration technology and cooperate with sub-vacuum pipelines to greatly improve the speed of freight lines in the subway.

According to calculations, with the use of new electromagnetic acceleration technology, coupled with sub-vacuum pipelines, the maximum speed of freight trains can be increased to 720 kilometers per hour.

This not only improves transportation efficiency, but also further expands the radiation range of the metropolitan area.

However, there are still some problems that need to be solved in the ultra-high-speed subway, such as station problems, deceleration problems, coordination problems, and so on.

Electromagnetic acceleration with sub-vacuum, the speed can indeed run fast, but deceleration is a problem.

If thrust reverser brakes are used, the energy consumption of the brakes is not a few; The use of friction mechanical brakes has certain damage to the track and wheels;

In addition, there is the ring track pneumatic braking method, which is to build a special ring track as a parking station, when the high-speed train enters the ring track, the train stops accelerating, and then gradually injects air into the track, using air resistance to slow down the train.

This scheme does not have much energy consumption, but it will increase the amount of work, and the braking time will take more than ten minutes.

In addition, there is also a reverse electromagnetic acceleration scheme, that is, when the train needs to slow down, the acceleration direction of a part of the electromagnetic track is reversed to achieve the effect of deceleration.

It is precisely because of these troubles that the current Homo sapiens subway has not further increased the speed of the train.

After all, the consumption brought by these transformations will reduce the cost performance of ultra-high-speed trains.

Unless it is a train with a range of more than 1,000 kilometers, the kind that almost does not stop in between, ultra-high-speed trains are useful.

Otherwise, in the case of a station of more than ten kilometers in Southeast Asia, the ultra-high-speed train will slow down before it has accelerated to the limit, and there is no need to use the ultra-high-speed train.

This is also the reason why the speed of the current passenger train of Homo sapiens is only 150~250 kilometers, not that the speed cannot be improved, but that there is no distance to increase the speed.