MTL - Into Unscientific-Chapter 481 meow~

  As the current chief designer of the Long March 3 rocket, Li Hua knows everything about the Xichang Satellite Launch Base.

   Like where is the backup power source for the base.

  For example, what is the startup password of the space carrier.

  For example, how to get to the escape route of the base.

   Another example.

  The specific structure of the base sewer pipeline integration point.

  The pipeline integration point he is referring to is located about five meters below the ground, and it is mainly used for sewage discharge in the buildings on the south side of the base, that is, the command building and the guest house.

   Among them, the underground water pump was just installed by his team last year, and it didn't even show the external area icon.

   In other words.

  The measurement results mentioned by Xu Yun are completely consistent with what Li Hua has learned, and it can even be said that there is no slightest deviation.

   More critically.

   This gravity gradiometer can actually scan cockroaches!

Of course.

   The exclamation point in this sentence has nothing to do with Li Hua's dislike of cockroaches, although cockroaches really deserve to die.

  What surprised him was that the cockroach was so small that it could be scanned by the gravity gradiometer at the bottom five meters apart.

To know.

  The weight of an adult cockroach is generally between 1-2 grams. The thickness of the soil layer is calculated as five meters and the texture is uniform. The gradient change of a cockroach should be .

  2.76x10^-12m/s.

   This accuracy value alone has surpassed Neon and other countries, and is comparable to the GOCE satellite with the highest accuracy on the surface.

  Thinking of this, Li Hua couldn't help touching his chin.

   Murphy

  Can this instrument really pass that level?

  But soon, Li Hua dismissed this idea.

  He was taught by his father a sentence since he was a child, called half ninety who walks a hundred miles, that is, the closer one thing is to success, the less one should take it lightly.

  Not to mention AC Milan, which was repeatedly whipped to death, Atsuto Suzuki at the press conference a few days ago proved this with his own reputation.

  So Li Hua is very clear that now is not the time to make a final conclusion.

   Then he turned his head, waved to Guo Ziyang again, and whispered a few words to him:

   "Xiao Guo, go and get in touch with Chef Ma over there in the cafeteria."

  Guo Ziyang nodded quickly after listening:

"receive!"

   As he spoke, he took out a communication device specially made by the Xichang Base from his body, and dialed a number:

   "Chef Ma. Well, I'm the one asking you to ask Master Cai to bring the car over. That's the 4.2 car. We're on standby here."

  After hanging up the phone.

  Guo Ziyang returned to Li Hua's side.

   Another few minutes passed.

  A 4.2-meter-sized blue-branded cold chain truck drove from the direction of the cafeteria of the base. The driver was a man in his forties.

   Li Hua greeted the car to the area 20 meters away from everyone, and said to Xu Yun at the same time:

   "Dr. Xu, this is a material transport vehicle for the canteen of the base. The vehicle is covered with anti-snapshot nets, and nano-cesium tungsten bronze is also added to the material of the vehicle. Try to see if you can detect the situation inside the vehicle."

  Xu Yun:

  “.?”

  He really wanted to ask Li Hua back, anti-shooting network can understand, are you sure you are serious about nano cesium tungsten bronze?

  However, this complaint was only fleeting in his mind, and Xu Yun soon focused on the inspection of the car.

Although the detection target this time is located on the ground, due to the "armor on the body", the difficulty is several times higher than that of the previous pipeline integration point. After all, the pipeline is only five or six meters underground, which is not deep. .

   Then soon.

  The F-500 central axis UAV equipped with a gravity gradiometer came to the sky above the car and began to conduct gradient detection.

  Considering that some students still have some doubts about the principle of the gravity gradiometer, here is another example that is not rigorous but easy to understand:

   Suppose you have various items on your desk, such as tissue boxes, confiscated razors, keyboards, computer screens, half-drunk Cokes, etc.

  The volume and height of these items are different.

   At this time.

  You hold a string in your hand and start sweeping from left to right across the table—assuming the string undulates silkily along the surface as it encounters the object.

  Then when the rope sweeps these items, the height between it and the tabletop will fluctuate with the appearance of the object. Compared with the tabletop, this change is the so-called 'gradient difference'.

  The gravity gradiometer is equivalent to a 'rope' whose sensitivity has been increased countless times, and it can accurately outline every minute of the scene.

  For example, there is a candy box on the table. There are more candies on the left side of the box and less candy on the right side.

  Then the gradient difference between these two intervals will be further different, and the finer the gradiometer, the more this gradient difference can be measured.

This kind of measurement is not the same as perspective. You can’t see the specific image inside, but you can analyze it through the signal difference. That’s why Xu Yun said before that if the water pump is in the field, it may be regarded as a coffin. objects.

   In other words.

  If this thing is installed on a satellite, it can also detect some information that the satellite remote sensing module cannot detect.

Of course.

   Again, this example can only be used for understanding, and it is not too rigorous in theory.

  The line of sight returns to reality.

five minutes later.

   Zhang Han, who was in charge of statistics, walked up to Xu Yun again with a document:

   "Dr. Xu, the result is out."

  Xu Yun took the report and looked at the cold chain car, then rotated the report 90 degrees so that the image screen was aligned with the front of the car.

  After finishing these, he looked at the result and said to Li Hua:

   "Gong Li, according to our inspection, the last thing in the car should be a basket of cabbage."

   "Further inside are celery, wax gourd, and eggplant. There is also a graphic that we haven't entered data yet, which looks like coriander or garlic sprouts."

   "In addition, we also scanned the engine of the car, which should be 3.0L. In addition, the rear suspension of the car seems to be cracked. Huh?"

   Talking and talking.

  Xu Yun was taken aback for a moment, and stopped talking in his entire life.

  See this scenario.

   Li Hua on the side couldn't help but his eyelids twitched, and asked aloud:

   "Is something wrong? Dr. Xu?"

  Xu Yun raised his forehead with a complicated expression, scratched his head, pointed at the car and said:

   "It's not a big deal, Li Gong. According to the measurement of the gravity gradiometer, there seems to be a cat near the chassis of this car."

   Li Hua was taken aback for a moment, and his expression became a little subtle in an instant:

".a cat?"

  Xu Yun nodded.

  Received Xu Yun's affirmative answer, even though Li Hua had a lot of experience, he was a little confused at this time.

  But soon he forced himself to withdraw his thoughts, took a deep breath, and said to Guo Ziyang:

   "Xiao Guo, tell Master Cai to turn off the fire first, and take a few people to check the car."

  Guo Ziyang took orders again:

"clear!"

   After finishing speaking, Guo Ziyang turned around and took a few people to tinker with the car.

   The structure of the chassis is as it should be, located at the bottom of the compartment.

  So there is no need to turn on the front engine when checking, just remove the carriage.

   At the same time it just so happens.

  The tractor that Guo Ziyang used to transport the F-500 mid-axis UAV was next to everyone. The maximum load capacity of this thing is as high as 2 tons.

  The maximum load of the 4.2-meter refrigerated truck is only 1.5 tons, so after a while of busy work, the car was unloaded onto the tractor.

   As a result, the carriage was just moved away.

  In the area near the chassis, there appeared a wagging cat tail and a small **** with raccoon stripes, and the short legs were bouncing around.

It is clear.

  The owner of the tail was frightened by the movement of the carriage, and was trying to get into the gap of the chassis.

  Guo Ziyang put on labor protection gloves when he saw this, stepped forward and pinched the back half of the kitten's body, and pulled the little guy out with a little force.

   This is a palm-sized small tabby cat with regular facial features and a trace of blue film in the eyes.

   After falling into Guo Ziyang's hands, he didn't struggle, but kept meowing, like an air defense siren:

   "giao～giao～"

  See this scenario.

  The eyes of Huang Yuting and Zhang Han, the only two women on the scene, instantly appeared full of little stars, as if they were ready to turn into Empress Shiji at any time.

   Fortunately, the two of them still maintained their basic rationality, knowing that this occasion is not suitable for smoking cats, so they didn't make any further moves just now.

  Li Hua walked up to Guo Ziyang, gently touched the top of the little milk cat's head, and said to Xu Yun:

   "Dr. Xu, it seems that we have successfully passed the inspection of the ground units this time."

  Xu Yun nodded in agreement.

  Just after the carriage was dismantled, the master driver followed Li Hua's instructions and opened the back door of the garage, revealing the interior.

  Although there is a short distance, everyone can still clearly see the distribution of ingredients in the garage, which is exactly the same as what Xu Yun said.

  The only slight difference is that the stack of what Xu Yun thought was garlic sprouts or coriander is actually a famous ingredient in Sichuan and Chongqing, Zheergen. This data belongs to the problem of importing, and has nothing to do with the accuracy.

  With the distribution of ingredients and the little raccoon being picked out, the second link can indeed be regarded as an official pass.

   Then Xu Yun thought about it, resisted the desire to tease the cat, and asked Li Hua:

   "Gong Li, what do we need to test next?"

  Li Hua was silent for a moment when he heard the words, then turned around and exchanged glances with Tongyou Ge, both of them looked solemn.

  Li Hua patted Xu Yun on the shoulder and said simply:

"Come with me."

   After he finished speaking, he waved his hand, and a ten-seater electric car quickly drove up beside him—in some schools, this kind of car is usually called Dabai or Xiaobai.

  Xu Yun didn't ask any more questions when he saw this, and obediently led everyone into the car.

   The console of the gradiometer was transported to another trailer. The Xichang Satellite Launch Base has nothing else, but there are many vehicles of various sizes.

  As for the kitten?

   is still held in Guo Ziyang's arms, and how to arrange it will be discussed after the measurement is over.

   Then a group of people drove along a road for more than ten minutes in an electric car, before they stopped at the foot of a mountain.

  After the operator commands the drone to fly to the sky.

  Li Hua pointed to the mountain in front of him, and still said concisely:

   "Xiao Xu, the maximum height of this unnamed mountain is 319 meters. Don't ask me about the specifics now. Let's explore along the mountainside."

   "Let's discuss if there is a result, and close the team if there is no result."

  “.”

  Xu Yun followed Li Hua's direction and glanced at the mountain peak in front of him, a flash of thought flashed in his eyes.

  319-meter peak

  Even in the middle of the mountain, the height is about 160 meters.

  This height value has undoubtedly exceeded the scope of the Yongling Underground Palace.

  Even if the Ming Dynasty was full of martial arts virtues, it would be impossible to build the underground palace storing the "Yongle Dadian" 160 meters below the ground—not to mention the Ming Dynasty, the Song Dynasty whose 1100 copies were modified by magic is probably not enough.

   So it's obvious.

  The purpose of Li Hua's inspection this time is definitely not to focus on the civilian use of the gravity gradiometer. The basic performance is so simple.

   Or to be precise.

  The will and attention of the initiators of this round of testing is definitely higher than that of Li Hua and Ge Tongyou.

  The previous two tests were just small tests, this time is the real one

  The big exam.

  Think here.

  Xu Yun didn't hesitate anymore, and said to Zhang Han:

   "Sister Zhang, just do what Li Gong said, go around the mountain and get the result as soon as possible."

  Zhang Han was obviously aware of the seriousness of the test, said yes, and left to make preparations.

   Right now.

   Within the entire site.

  No one spoke, only the little raccoon who had recovered a little strength kept meowing in Guo Ziyang's arms.

   Two minutes later.

  After the equipment debugging is completed, the F-500 central axis UAV begins to fly around the sky with the gravity gradiometer.

  The principle of the gravity gradiometer has been explained with a simple example above, but in fact the difficulty of the gravity gradiometer in the operation process is much higher than the "line" in the example.

   In theory.

  Gradient is a special form of Jacobian matrix. When m=1, the Jacobian matrix of the function is the gradient.

   This concept was originally set for field theory, and any field can be used to understand gradients.

  It was later quoted in mathematics to indicate the direction and magnitude of the fastest variable rate of a function at a specified point, and it is a digital abstraction of change efficiency.

   It is for this reason.

  Physical gradient calculation involves the numerical solution of partial derivatives of multivariate functions. An incoming point has theoretically 256X12 isopotential function values, so it has unimaginably high requirements for measuring particles.

  A similar example is buoyancy.

  The reason for the existence of buoyancy is that there is a gradient in the liquid pressure in the direction of gravity, which involves the category of hydrostatics.

  So let’s be honest.

  Xu Yun is not sure whether he can detect the internal scene through the mountain height of 160 meters.

   And just as Xu Yun looked up at the drone in the sky, Zhang Han, who had been paying attention to the scanning situation, suddenly let out a light sigh:

   "Hey, Dr. Xu, there are a lot of ice slags on the mountain. It almost covers the whole mountain."

   "Ice slag?"

  Xu Yun was slightly taken aback when he heard this.

   Even though Xuan thought of something, he suddenly turned his head and looked at Li Hua.

  But before Xu Yun could speak, Li Hua shook his head lightly:

   "Dr. Xu, didn't I tell you, don't ask too many questions."

  Xu Yun opened his mouth, but finally fell silent.

  When he raised his head again, the expression on his face became more solemn.

It’s mid-February right now, and a mountain over 300 meters may be covered with snow, but it’s absolutely impossible to be covered with ice **** in a large area—in fact, it’s unlikely even in the cold winter, and ice **** should never appear on the mountain. How about the mountain?

   So obvious.

  These ice slags must be placed artificially.

  The purpose of this step is undoubtedly much more confidential than Xu Yun originally thought.

   Speaking of ice surface, is it for

   That thing?