Chapter 859 Can the Desert Become Fertile Fields?

Chapter 859 The desert... can be turned into fertile farmland?

After Li Nianheng's question, the entire conference room finally returned to the relatively serious atmosphere at the beginning.

Lu Jinhui also switched to another PPT immediately.

"The samples from the Badain Jaran Desert are also divided into three groups: A, B, and C according to the distribution of sampling points. The characteristics of the three groups of samples are consistent. Among them, group B is the southern part of the desert close to the northern foothills of the Qilian Mountains and the A The right flag part has the most obvious characteristics, so I will use it as an example to explain..."

"Relatively speaking, the situation of Badain Jaran Group B is different from that of Tengger Group A. Its chemical properties, bulk density, water holding capacity, saturated hydraulic conductivity, porosity and other hydraulic characteristics are similar to those of ordinary deserts. But the particle condition is quite different from typical desert sand.”

He said and posted two more photos that were similar to the ones before.

It's just that the object of comparison this time is slightly different.

It can be seen that the Group B gravel samples on the left are very different in appearance.

At least it doesn't look so round.

However, due to inappropriate chemical properties and porosity, it cannot replace the role of river sand.

“Through the same effective stress test as in the previous step, we found that the normal contact pressure and tangential restraining force of Badain Jaran Group B were significantly better than those of Tengger Group A when there were obvious constraints on the sides of the sand column. Other samples are even better than some river sand..."

"..."

The introduction ended quickly.

This time, everyone's feedback seemed much colder.

The main thing is... I really can't think of the significance of this feature for a while.

After all, the use of sand is relatively narrow.

After excluding building materials, which is the most likely direction to produce results, it seems that only the semiconductor industry is left...

In theory, it can be used to refine silicon.

However, semiconductor-grade sand raw materials need to be relatively pure and have good porosity.

However, a lot of magnesium, manganese, and calcium can be detected in the ingredients of Badain Jaran Group B, especially the latter two, which are harmful ingredients to the silicon industry, and the sand is relatively compact, which is not conducive to subsequent steps. deal with.

All in all, it looks a bit tasteless.

However, Li Nianheng was still quite excited.

Because such distinctive geological conditions, whether meaningful or not, are very suitable for verifying SAR signals.

"Professor Chang, Professor Meng, look, after we go back, can we start to summarize the patterns in these data?"

Meng Zhenyuan, who had been an audience just now, nodded:

"At least, we can now clearly see that the results obtained after data dimensionality reduction processing can indeed correspond to geological conditions with different characteristics..."

Although the person who specifically designed the data extraction and processing algorithms was Chang Haonan, the starting point of everything, that is, the subject of remote sensing data analysis, still bears the name of Meng Zhenyuan.

And even according to the most stringent conditions, at this point, the project can be considered complete.

"Professor Chang, what do you mean..."

Li Nianheng never heard Chang Haonan's response, so he turned to look at him.

But he found that Chang Haonan was holding his chin with one hand, looking down in thought, but never spoke.

There was a brief silence.

"Then...if all comrades have no other questions, the preliminary situation of the two desert areas will be introduced here first. The following should be the three areas at the northern foot of the Tianshan Mountains. Please..."

As Zhai Mingguo, who acted as the temporary host, opened his mouth, Lu Jinhui, who was already very satisfied with the presentation of his results, also began to pack up his things and prepare to give up the podium to the next person.

However, at this moment, Chang Haonan suddenly raised his head again:

"etc!"

Lu Jinhui's action of putting away the computer paused momentarily, and then plugged back the signal cable that had been unplugged.

The projector comes back on.

"Professor Chang, please tell me."

"In addition to normal contact pressure and tangential restraining force, have you measured the restraining tension and restraining moment of this set of samples?"

Chang Haonan pointed at the curtain.

"Restraining force and binding moment..."

This somewhat awkward question made Lu Jinhui stunned for a moment, and then he shook his head in confusion:

"No……"

In fact, stress testing itself is not an item in the standard testing process.

As for the normal contact pressure and tangential restraining force that he had already done, he filled them in with reference to a paper on geotechnical engineering.

Looking at Lu Jinhui's confused eyes on the stage, Chang Haonan organized his language and then explained:

"If this group of desert sand samples can provide normal contact pressure and tangential binding force at the same time under certain conditions..."

At this point, he felt that describing it in words might be a bit weak, so he looked at Zhai Mingguo next to him:

"Researcher Zhai, do we have a blackboard here?"

The latter looked around and found that there was indeed only the piece on the wall in the conference room.

But it was blocked by the curtain.

However, after all, it was Chang Haonan's request, so it must still be met.

Within a few minutes, two staff members walked in from the door pushing a small blackboard on a pulley.

Chang Haonan was not polite and stood up directly and came to the podium.

This action made Lu Jinhui confused about where he should be for a while.

"Oh... you go down first."

Chang Haonan said.

Then he turned around, picked up the chalk and quickly drew dozens of small spheres on the blackboard, explaining:

"Comrades, look."

"Assuming that the sand particles have normal contact pressure, tangential constraint force, constraint tension and constraint torque at the same time, and can also guarantee a certain degree of follow-up freedom, it means that each particle can generate both constraint reaction force and displacement along the direction of constraint reaction force."

"And if we expand the perspective, let the sand particles in this entire space have this characteristic, and make them in a rheological state in some way, then any particle can contact with another particle in any direction to generate constraint, even if the two particles are separated, as long as they can restore contact, this constraint can be re-formed..."

As he analyzed, the blackboard was gradually filled with white, yellow, and blue chalk marks, and even the small spheres drawn at the beginning could not be seen clearly.

In fact, this kind of analysis should be done on the computer in a form similar to molecular dynamics simulation.

It's just that Chang Haonan was just brainstorming, so it can only be presented on the blackboard at the moment.

Fortunately, some people still understood what he meant.

"That is to say, if we can use some method to transform sand... uh... this type of sand from a discrete state to a rheological state, then the sand bodies that were originally separated one by one will be transformed into omnidirectional constraints and can self-repair to a certain extent..."

Zhai Mingguo has obviously grasped the key points of Chang Haonan's introduction.

It's just that there is really no way to express it more vividly.

At this time, Lu Jinhui, who had just returned to his seat, added a sentence just right:

"The properties will be similar to... No, it will be basically equivalent to soil?"

As soon as this was said, everyone in the entire conference room understood it instantly.

Although the soil transformed from sand bodies is still different from real soil in chemical composition, its physical properties have the ability to store water, nutrients and air.

That's enough.

As long as the ecological-mechanical properties can be maintained for a long time, the missing things can be completely supplemented by artificial means such as precipitation or fertilization.

And if we look at the long-term...

It can even be said that deserts with sand body characteristics similar to those of Badain Jaran Group B have the opportunity to be transformed into soil with conditions for large-scale production!

For China, which is facing serious land degradation and sandstorm problems, this can be said to be a long-awaited rain.

Especially in the central and western parts of Inner Mongolia and the central part of Longyuan, the terrain is actually slopes and plains that are easy to cultivate on a large scale, but the land conditions are too poor to meet the needs.

If these parts can really be transformed into arable land...

Everyone looked at each other.

Dare not think about it.

Dare not think about it at all.