The Military-industrial Scientific Research System of the Academic Master Chapter 859

Chapter 859: Can the desert...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.

Mainly... I really can't think of the significance of this feature for a while.

After all, the use of sand is inherently narrow.

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

Theoretically, it can be used to refine silicon.

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

However, a lot of magnesium, manganese, and calcium can be detected in the ingredients of Badain Jaran Group, 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.

In short, it looks a bit tasteless.

However, Li Nianheng is still quite excited.

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

“Professor Chang, Professor Meng, look, after we go back, can we start to use these data to summarize the patterns?”

Meng Zhenyuan, who had been an audience member 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.

Even under 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.

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

There was a brief silence.

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

As the temporary host Zhai Mingguo spoke, 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 paused for a moment in putting away the computer, and then plugged the signal cable back in that had been unplugged.

The projector lights up again.

“Professor Chang, please tell me.”

“In addition to the 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 tension and restraining moment…”

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

“No…” In fact, the stress test itself is not an item in the standard testing process.

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

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

“If this group of desert sand samples can simultaneously provide normal contact pressure and tangential restraining force under certain conditions...”

At this point, he felt that verbal description alone might be a bit feeble, 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, it is Chang Haonan's request after all, 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 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 **** on the blackboard, and explained at the same time:

“Comrades, look.”

“Assuming that sand particles have normal contact pressure, tangential restraining force, restraining tension, and restraining moment at the same time, and can also ensure a certain following degree of freedom, it means that each particle can not only generate restraining reaction force but also react along the restraining force. The direction of the force produces displacement.”

"And if we enlarge the angle of view, let the sand particles in the entire space have this characteristic, and put them in a rheological state in some way, then any particle can interact with other particles in any direction. A particle comes into contact to create a constraint. Even if the two particles separate, as long as the contact can be restored, the constraint can be formed again..."

As he analyzed, the blackboard was gradually filled with white, yellow, and blue chalk marks, and even the small round **** originally drawn on it were difficult to see clearly.

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

It's just that Chang Haonan just brainstormed, so now he can only present it on the blackboard.

Fortunately, someone below still understood what he meant.

"In other words, if there is some way to transform the sand... uh... this type of sand from a discrete state into a rheological state, then the original sand body that is separated one by one will be transformed into an omnidirectional binding force. It can be self-repaired to a certain extent..."

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

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

At this time, Lu Jinhui, who had returned to his seat not long ago, added just the right sentence:

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

As soon as these words came out, everyone in the entire conference room suddenly understood.

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

This is enough.

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

And if we take a longer view...

It can even be said that deserts with sand body characteristics close to Badain Jaran Group B have the opportunity to transform 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 good rain after a long drought.

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

If these parts can really be converted into cultivated land...

Everyone looked at each other.

OK.

I don't dare to think about it at all.

(End of this chapter)

Chapter end

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